Skocz do pozycji: 1.

Tytuł:

Performance evaluation of ZVS/ZCS high efficiency AC/DC converter for high power applications

Autorzy:

Ali, A.
Chuanwen, J.
Khan, M. M.
Habib, S.
Ali, Y.

Powiązania:

https://bibliotekanauki.pl/articles/200472.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

switching losses
zero current switching
zero voltage switching
power quality
reverse recovery loss

Opis:

The increased power density, reduced switching losses with minimum electromagnetic interference (EMI), and high efficiency are essential requirements of power converters. To achieve these characteristics, soft power converters employing soft switching techniques are indispensable. In this paper, a ZCS/ZVS PWM AC/DC converter topology has been emphasized, which finds applications in high power systems such as automobile battery charging and renewable energy systems. This converter scheme maintains zero current and zero voltage switching conditions at turn on and turn off moments of semiconductor switches, respectively and soft operation of rectifier diodes that lead to negligible switching and diode reverse recovery losses. Moreover, it improves power quality and presents high input power factor, low total harmonic distortion of the input current (THDI ) and improved efficiency. The validity of theoretical analysis of the proposed converter has been carried out experimentally on a 10 kW laboratory prototype. Experimental results prove that the soft switching operation of the semiconductor switches and diodes is maintained at 98.6% rated load efficiency. In addition, the performance evaluation has been performed by comparative analysis of the proposed converter with some prior art high power AC/DC converters. Efficiencies of the proposed and prior art high power topologies have been determined for different load conditions. The highest efficiency, power factor and lower THDI of the proposed converter topology complies with international standards.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 793-807
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Multistage optical switching networks

Autorzy:

Kaczmarek, S.

Powiązania:

https://bibliotekanauki.pl/articles/309271.pdf

Data publikacji:

2002

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

optical matrix
optical switching networks
electronic switching networks equivalent
connection properties

Opis:

The backbone networks evolution to high-speed DWDM networks generates new problems for switching. This function element must be also based on optical technology. For large capacity this cannot be realized by a single matrix, but by multistage switching networks. In the paper three types of optical matrices have been described: fiber switch FX, wavelength fiber switch WSX and wavelength interchanging fiber switch WIX. Based on these matrices, four switching network constructions were considered. The connection properties of these switching networks were evaluated, determining the electronic equivalent switching network for which these properties are well known.

Źródło:

Journal of Telecommunications and Information Technology; 2002, 2; 21-25
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Recurrent Method for Blocking Probability Calculation in Switching Networks with Overflow Links

Autorzy:

Głąbowski, M.
Stasia, M. D.

Powiązania:

https://bibliotekanauki.pl/articles/307836.pdf

Data publikacji:

2013

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

intersection links
switching networks

Opis:

This article presents a new recurrent method for modelling multi-service switching networks with overflow links. In the proposed method, the blocking probability for a given stage of the switching network is determined on the basis of the characteristics of the preceding stage. A particular attention is given to a possibility of a considerable reduction of the internal blocking probability of the switching network that would result from an application of additional overflow links between neighbouring switches of the first stage of the network. The results of the analytical modelling of selected multi-service switching networks with overflow links in the first stage are compared with the results of the simulation experiments. The study confirms the accuracy of all the adopted theoretical assumptions in the proposed analytical model of the multi-service switching network.

Źródło:

Journal of Telecommunications and Information Technology; 2013, 1; 56-64
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Packet switch architecture with multiple output queueing

Autorzy:

Danilewicz, G.
Głąbowski, M.
Kabaciński, W.
Kleban, J.

Powiązania:

https://bibliotekanauki.pl/articles/308342.pdf

Data publikacji:

2004

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

high-speed packet switching
output queueing
buffer
switch fabric
switching node
multicast

Opis:

In this paper the new packet switch architecture with multiple output queuing (MOQ) is proposed. In this architecture the nonblocking switch fabric, which has the capacity of N _N2 N2, and output buffers arranged into N separate queues for each output, are applied. Each of N queues in one output port stores packets directed to this output only from one input. Both switch fabric and buffers can operate at the same speed as input and output ports. This solution does not need any speedup in the switch fabric as well as arbitration logic for taking decisions which packets from inputs will be transferred to outputs. Two possible switch fabric structures are considered: the centralized structure with the switch fabric located on one or several separate boards, and distributed structure with the switch fabric distributed over line cards. Buffer arrangements as separate queues with independent write pointers or as a memory bank with one pointer are also discussed. The mean cell delay and cell loss probability as performance measures for the proposed switch architecture are evaluated and compared with performance of OQ architecture and VOQ architecture. The hardware complexity of OQ, VOQ and presented MOQ are also compared. We conclude that hardware complexity of proposed switch is very similar to VOQ switch but its performance is comparable to OQ switch.

Źródło:

Journal of Telecommunications and Information Technology; 2004, 4; 76-83
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Wpływ metody sterowania na straty mocy w falowniku napięcia o komutacji miękkiej typu ZVS z dławikami sprzężonymi
Influence of control method on power loss of the inductor-coupled voltage-source ZVS soft-commutated inverter

Autorzy:

Karyś, S.

Powiązania:

https://bibliotekanauki.pl/articles/154917.pdf

Data publikacji:

2009

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

przełączanie miękkie
ZVS
soft switching

Opis:

W artykule poddano analizie matematycznej wpływ metody sterowania na straty mocy trójfazowego falownika o komutacji miękkiej typu ZVS z dławikami sprzężonymi. Przeprowadzona analiza pozwala oszacować wartość o jaką można zredukować straty mocy w łącznikach analizowanego przekształtnika dzięki zastosowaniu metody sterownia o zmiennym czasie trwania sygnałów sterujących - uzależnionym od wartości chwilowej prądu obciążenia. W klasycznej metodzie sterowania czas trwania i położenie sygnałów sterujących jest stałe, niezależne od wartości chwilowej prądu fazowego odbiornika. W efekcie gromadzona jest nadmierna energia w elementach obwodu rezonansowego, której cyrkulacja powoduje straty mocy. Zastosowanie uproszczonego modelu strat pozwoliło na uzyskanie bezpośrednich wyrażeń matematycznych opisujących straty w poszczególnych elementach falownika. Na ich podstawie konstruktor może szybko obliczyć straty oraz sprawność falownika w funkcji: prądu obciążenia, częstotliwości przełączania, parametrów wybranych łączników energoelektronicznych. Na przykładzie konkretnego falownika pokazano, że precyzyjne sterowanie czasem trwania i położeniem sygnałów sterujących umożliwia istotne ograniczenie strat mocy.
This paper presents mathematical analysis of the inductor-coupled voltage-source soft-commutated inverter as regards to control method. The analysis makes it possible to estimate the reduction of the power loss in the switches of the analysed inverter, by using the variable-time control method - depending on instantaneous value of the load current. At classical control method the duration and the location of the control signals are constant, independent of the instantaneous value of the load current. In the result, superfluous energy has been accumulated in the resonant tank elements. Energy circulation produces power loss. Loss in particular inverter elements is directly expressed by mathematical equation thanks to the simplified model of the power loss. Designer can quickly compute the loss and efficiency versus the load current, switching frequency, and parameters of switches. On the example of the definite inverter it is shown that precise control of the duration and location of the control signals contributes to real power loss reduction.

Źródło:

Pomiary Automatyka Kontrola; 2009, R. 55, nr 9, 9; 744-749
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Spectres of Ambiguity in Divergent Thinking and Perceptual Switching

Autorzy:

Taranu, Mihaela
Loesche, Frank

Powiązania:

https://bibliotekanauki.pl/articles/985735.pdf

Data publikacji:

2017

Wydawca:

Projekt Avant

Tematy:

ambiguity
divergent thinking
perceptual switching

Opis:

Divergent thinking as a creative ability and perceptual switching between different interpretations of an unchanging stimulus (known as perceptual multistability) are thought to rely on similar processes. In the current study, we investigate to what extent task instructions and inherent stimulus characteristics influence participants' responses. In the first experiment, participants were asked to give as many interpretations for six images as possible. In the second experiment, participants reported which of two possible interpretations they saw at any moment for the same line drawings. From these two experiments, we extracted measures that allow us direct comparison between tasks. Results show that instructions have a large influence over the perception of images traditionally used in two different paradigms and that these images can be perceived in appropriate ways for both tasks. In addition, we suggest that the connection between the two phenomena can be explored interchangeably through three experimental manipulations: a) using a common set of images across both experiments, b) giving different task instructions for the two tasks, and c) extracting comparable metrics from both experimental paradigms.

Źródło:

Avant; 2017, 8
2082-6710

Pojawia się w:

Avant

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

SMM Clos-Network Switches under SD Algorithm

Autorzy:

Kleban, J.
Warczyński, J.

Powiązania:

https://bibliotekanauki.pl/articles/307990.pdf

Data publikacji:

2018

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

clos-network switch
packet dispatching algorithms
packet switching networks
stability of switching network

Opis:

This paper is devoted to evaluating the performance of Space-Memory-Memory (SMM) Clos-network switches under a packet dispatching scheme employing static connection patterns, referred to as Static Dispatching (SD). The control algorithm with static connection patterns can be easily implemented in the SMM fabric due to bufferless switches in the first stage. Stability is one of the very important performance factors of packet switching nodes. In general, a switch is stable for a particular arrival process if the expected length of the packet queues does not increase without limitation. To prove the stability of the SMM Clos-network switches considered under the SD packet dispatching scheme the discrete Markov chain model of the switch is used and Foster’s criteria to extend Lyapunov’s second (direct) method of stability investigation of discrete time stochastic systems are used. The results of simulation experiments, in terms of average cell delay and packet queue lengths, are shown as well.

Źródło:

Journal of Telecommunications and Information Technology; 2018, 1; 24-31
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Analysis of switching on selected electrical high voltage circuits
Analiza procesu załączania wybranych obwodów elektroenergetycznych wysokiego napięcia

Autorzy:

Kulas, S. J.
Supronowicz, H.

Powiązania:

https://bibliotekanauki.pl/articles/1361016.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

switching on unloaded transformers and capacitor banks
power switching phase
synchronized switching
załączanie transformatorów nieobciążonych oraz baterii kondensatorów
faza załączania prądu
łączenia synchronizowane

Opis:

Physical phenomena occurring in high-current contact systems of electric switches, when switching on unloaded transformers and capacitor banks, are much more dangerous than the phenomena occurring in the contact switch systems installed in other electric power systems. Switching on unloaded transformers may be accompanied by significant over-currents, greatly exceeding the nominal currents of the transformer. Connecting the capacities of capacitor banks causes transients in the circuit, leading to significant, fast over-currents and over-voltages. High-frequency currents may be transmitted by electromagnetic couplings to control circuits and other low-voltage circuits. The subject of the paper is the analysis of transient processes during switching on unloaded transformers and the capacities of capacitor banks. Additionally, the authors assess the impact of the power switching phase in particular circuits on the over-currents which arise there.
Zjawiska fizyczne zachodzące w wielkoprądowych układach stykowych łączników elektrycznych podczas załączania transformatorów nieobciążonych oraz baterii kondensatorów są o wiele groźniejsze w skutkach niż zjawiska występujące w układach stykowych łączników zainstalowanych w innych układach elektroenergetycznych. Załączaniu transformatorów nieobciążonych towarzyszyć mogą znaczne przetężenia, przekraczające istotnie wartości prądów znamionowych transformatora. Łączenie pojemności baterii kondensatorów wywołuje stany przejściowe w danym obwodzie, prowadzące do znacznych, szybkozmiennych przetężeń prądowych i przepięć. Prądy wysokiej częstotliwości mogą się przenosić przez sprzężenia elektromagnetyczne na obwody sterownicze i inne obwody niskiego napięcia. Analiza procesów przejściowych podczas załączania transformatorów nieobciążonych oraz pojemności baterii kondensatorów, a także ocena wpływu fazy załączania prądu w poszczególnych obwodach na powstające tam przetężenia są przedmiotem artykułu.

Źródło:

Mining – Informatics, Automation and Electrical Engineering; 2016, 54, 1; 33-38
2450-7326
2449-6421

Pojawia się w:

Mining – Informatics, Automation and Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Analiza naprężeń transformatorów rozdzielczych od przepięć łączeniowych
Analysis of risks of distribution transformers from switching overvoltages

Autorzy:

Furgał, J.
Ibragimow, M.

Powiązania:

https://bibliotekanauki.pl/articles/320265.pdf

Data publikacji:

2007

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

transformatory
napięcia łączeniowe
transformers
switching overvoltages

Opis:

W czasie łączenia transformatorów, szczególnie wyłącznikami próżniowymi, mogą powstawać przepięcia stanowiące znaczne narażenia układów izolacyjnych zewnętrznych i wewnętrznych transformatorów. W artykule przedstawiono wyniki obliczeń przepięć powstających podczas załączania i wyłączania transformatorów w sieciach rozdzielczych. Analizowano wpływ ograniczników przepięć oraz długości Unii kablowych zasilających na przepięcia łączeniowe. Słowa kluczowe: transformatory, napięcia łączeniowe
During switching of transformers, especially by use of vacuum breakers, overvoltages can be generated which have considerable influence on damage risk of external and intemal transformer insulation systems. The calculation results of overvoltages which are generated during switch-on and switch-off distribution transformers are presented in the paper. The paper also presents an analysis of an influence of surge arresters and the length of the supply cable lines on switching overvoltages.

Źródło:

Elektrotechnika i Elektronika; 2007, 26, 1--2; 23-29
1640-7202

Pojawia się w:

Elektrotechnika i Elektronika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Code-switching on Facebook among Jordanians

Autorzy:

AbuTayeh, Amal

Powiązania:

https://bibliotekanauki.pl/articles/2013175.pdf

Data publikacji:

2021

Wydawca:

Komisja Nauk Filologicznych Polskiej Akademii Nauk, Oddział we Wrocławiu

Tematy:

code-switching
Facebook
computer-mediated communication

Opis:

Over the past years, the Internet has become a tool of communication among different people in the world. Due to the spread of the Internet, many researchers have focused their attention on the study of language use through the Internet. Code-switching is one of the sociolinguistic phenomena that have been observed in Computer Mediated Communication (CMC). The present paper explores the sociolinguistic phenomenon of code-switching in computer mediated communication by Jordanians. The study highlighted several English words that have been utilized for code-switching through online interaction. Furthermore, it studied the participants’ views about the role of Facebook in mixing Arabic with English. The methodology used in this study was descriptive, involving both qualitative and quantitative methods. An online questionnaire was shared on Facebook pages and groups. The sample included 181 participants; in addition, 35 interviews took place at home with relatives, with neighbors and in shops. The results revealed several perspectives about code-switching. Some participants mentioned that Facebook has led them to code-switch by using the most frequently switched words, such as; comment, like, group, share. Nevertheless, other participants mentioned that they prefer to use Modern Standard Arabic (MSA) and avoid using any English words in online activities, which means that Facebook has no impact on their language. A higher percentage of participants agreed that Facebook plays a role in mixing Arabic with English.

Źródło:

Academic Journal of Modern Philology; 2021, 14; 45-54
2299-7164
2353-3218

Pojawia się w:

Academic Journal of Modern Philology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Defragmentation in W-S-W Elastic Optical Networks

Autorzy:

Rajewski, R.

Powiązania:

https://bibliotekanauki.pl/articles/308848.pdf

Data publikacji:

2018

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

W-S-W switching fabric
defragmentation

Opis:

In most cases defragmentation occurs, in elastic optical networks, in the links between the network’s nodes. In this article, defragmentation in an elastic optical network’s node is investigated. The W-S-W switching architecture has been used as a node. A short description of a purpose-built simulator is introduced. Several methods of defragmentation which are implemented in this simulator are described as well.

Źródło:

Journal of Telecommunications and Information Technology; 2018, 1; 18-23
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Three-phase soft-switching inverter with coupled inductors, experimental results

Autorzy:

Karyś, S.

Powiązania:

https://bibliotekanauki.pl/articles/200045.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

soft-switching
resonant inverter
ZVS inverter

Opis:

This paper presents experimental results of the three-phase soft-switching inverter with coupled inductors that verify the control method influence on efficiency improvement. Different kinds of control methods were tested on the 6 kW experimental inverter. A short discussion on a few design methods of the resonant tank elements was made. Experimental results confirm that the advanced control algorithm and the proposed new design method of the resonant tank elements significantly increase the efficiency of this resonant inverter.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 535-540
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Modelling Inflation Using Markov Switching Models: Case of Poland, 1992 – 2005

Autorzy:

Białowolski, Piotr
Zwiernik, Piotr
Żochowski, Dawid

Powiązania:

https://bibliotekanauki.pl/articles/500116.pdf

Data publikacji:

2011

Wydawca:

Szkoła Główna Handlowa w Warszawie

Tematy:

Markov Switching Models
Inflation modelling
Leading Indicators

Opis:

We investigate inflation in Poland in the period of economic transition by examining the potential application of Markov Switching Models to model the inflation generating process in Poland. The time horizon of analysis was limited to the period between March 1992 and October 2005 defined as the process of disinflation, i.e. the process of continued decrease in inflation rates following the economic transition period in early 1990s which was accompanied by a high level of inflation. According to the Ball-Friedman hypothesis, variation of inflation during periods of high inflation can be unstable. Indeed, the results show that non-linear models significantly improve the description of inflation generating process in Poland. Apart from univariate Markov Models, we also use a model that incorporates inflation expectations measured by Future Inflation Indicator (FII). We find that the model, where lagged values of FII are included as exogenous variables is significantly better in modelling inflation than simple univariate Markov Model.

Źródło:

Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2011, 86:Business Surveys, Business Cycles. Polish Contribution to the 30th CIRET Conference; 185-199
0866-9503

Pojawia się w:

Prace i Materiały Instytutu Rozwoju Gospodarczego SGH

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Dobór wartości elementów obwodu rezonansowego falownika typu ARCP
Selection of the values of the ARCP inverter resonant circuit elements

Autorzy:

Karyś, S.

Powiązania:

https://bibliotekanauki.pl/articles/153343.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

miękkie przełączanie
rezonans
ARCP
soft switching
resonance

Opis:

W artykule przedstawiono metodę doboru wartości elementów obwodu rezonansowego dla klasy falowników biegunowych z pomocniczym obwodem rezonansowym - ARCP. Wyprowadzone równania matematyczne umożliwiają dokładne obliczenie wartości elementów obwodu rezonansowego. Dokonano analizy stosowanych metod doboru wartości elementów. W sposób analityczny udowodniono, że często stosowana metoda projektowania, zalecająca duże wartości pojemności rezonansowych, prowadzi do zwiększenia strat mocy w obwodzie rezonansowym.
The paper presents a method for selection of the resonant circuit element values for the auxiliary resonant commutated pole class inverter - ARCP. This type of inverter was developed twenty years ago. Since then the appropriate design method for selection of the resonant element value has not been elaborated. Nowadays the electric and hybrid drive systems are the main area of implementation for the ARCP inverter. The high efficiency can be achieved by right selection of the resonant element values and advanced control technique. The proposed selection method is based on minimisation of the energy oscillating in the resonant circuit. The derived mathematical equations make it possible to precisely calculate the values of the resonant circuit elements. The analysis of the selection method that has been used up to now was performed. It was analytically proved that the design method still in use, recommending a large resonant capacitor value, increases the power loss in the resonant circuit. Due to The proposed method enables significant reduction in the power loss and EMI interferences.

Źródło:

Pomiary Automatyka Kontrola; 2010, R. 56, nr 12, 12; 1457-1460
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Optimizing plants maintenance cost using strategic switching approach

Autorzy:

Kareem, B.

Powiązania:

https://bibliotekanauki.pl/articles/409124.pdf

Data publikacji:

2013

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

maintenance
strategy
optimality
scheduling
deterioration
switching
plant

Opis:

Inadequate supply of public electricity in Nigeria has affected the productivity of many manufacturing industries. Electric generating plant is being used as a standby supplement to public electricity at outage hours. The high cost of running and maintenance of this generating plant has adversely affected the sustainability of the industry. A maintenance strategic switching approach was developed to minimize the cost of running the electric generating plant in the industries. Maintenance strategic switching and cost control parameters are preventive, repair/corrective and replacement. The maintenance cycle for each of the components served as tool for the determination of cumulative sum of maintenance cost from which the minimum cost schedule was selected. Data collected on power machinery from a water generating company was used to test the model. The least probability of failure (non-progressive deterioration) for components was recommended for adoption. There was a significant saving in maintenance cost of components under the non-progressive deterioration. In the 750 schedule, while the cost of maintenance with progressive deterioration was N149, 677, that of non-progressive, least failure probability was N75, 960.35 with savings of 49.25% over the former. Therefore, most economic schedule was 750 cycles. This scheme predicted for the organization the optimal maintenance strategy to utilize.

Źródło:

Research in Logistics & Production; 2013, 3, 3; 193-212
2083-4942
2083-4950

Pojawia się w:

Research in Logistics & Production

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

On the classification of observations in the switching regression
O klasyfikacji obserwacji w regresji przełącznikowej

Autorzy:

Pruska, Krystyna

Powiązania:

https://bibliotekanauki.pl/articles/904610.pdf

Data publikacji:

1997

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

switching regression model
discrimination analysis
loss function

Opis:

The paper discusses the method of determining the sample division indicator for the switching regression model in case of two states generating values of the explained variable, which ensures the least risk of making a mistake, understood as the expected value of relevant loss function. This paper is an attempt to take advantage of the discrimination analysis elements in the switching regression analysis.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 1997, 141
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Performance evaluation of the multiple output queueing switch with different buffer arrangements strategy

Autorzy:

Danilewicz, G.
Kabaciński, W.
Pleban, J.
Parniewicz, D.
Dąbrowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/308008.pdf

Data publikacji:

2006

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

packet switching
switch fabric
multiple output queueing

Opis:

Performance evaluation of the multiple output queueing (MOQ) switch recently proposed by us is discussed in this paper. In the MOQ switch both the switch fabric and buffers can operate at the same speed as input and output ports. This solution does not need any speedup in the switch fabric as well as any matching algorithms between inputs and outputs. In this paper new performance measures for the proposed MOQ switch are evaluated. The simulation studies have been carried out for switches with different buffer arrangements strategy and of capacity 2×2, 4×4, 8×8, 16×16 and 32×32, and under selected traffic patterns. The simulations results are also compared with OQ switches of the same sizes.

Źródło:

Journal of Telecommunications and Information Technology; 2006, 3; 43-48
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Investigating Code-switching in a Content and Language Integrated Learning (CLIL) Classroom

Autorzy:

Papaja, Katarzyna Lidia
Wysocka-Narewska, Marzena

Powiązania:

https://bibliotekanauki.pl/articles/783207.pdf

Data publikacji:

2020

Wydawca:

Wydawnictwo Uniwersytetu Śląskiego

Tematy:

code-switching, CLIL, CLIL learners, CLIL teachers

Opis:

The aim of this article is to provide an outline of the research on code-switching in CLIL, starting with a brief description of code-switching and its main causes. The study, which is to be presented, was conducted among Secondary School CLIL learners and is based on a questionnaire especially prepared for this study. The main aim of the study was to investigate the situations in which CLIL learners switch the codes. Additionally, the researchers were trying to find out the positive and negative impact of this phenomenon on the foreign language being acquired.

Źródło:

Theory and Practice of Second Language Acquisition; 2020, 6, 1; 51-63
2450-5455
2451-2125

Pojawia się w:

Theory and Practice of Second Language Acquisition

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Perturbations in a Signed Graph and its Index

Autorzy:

Stanić, Zoran

Powiązania:

https://bibliotekanauki.pl/articles/31343791.pdf

Data publikacji:

2018-08-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

signed graph
switching equivalence
index
computer search

Opis:

In this paper we consider the behaviour of the largest eigenvalue (also called the index) of signed graphs under small perturbations like adding a vertex, adding an edge or changing the sign of an edge. We also give a partial ordering of signed cacti with common underlying graph by their indices and demonstrate a general method for obtaining lower and upper bounds for the index. Finally, we provide our computational results related to the generation of small signed graphs.

Źródło:

Discussiones Mathematicae Graph Theory; 2018, 38, 3; 841-852
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Translanguaging as Mobilisation of the Linguistic Resources by Learners of Spanish as a Third or Additional Language

Autorzy:

Wlosowicz, Teresa Maria

Powiązania:

https://bibliotekanauki.pl/articles/783191.pdf

Data publikacji:

2020

Wydawca:

Wydawnictwo Uniwersytetu Śląskiego

Tematy:

multilingual repertoires, code-switching, translanguaging, production strategies

Opis:

The present study investigates the comprehension and production of Spanish as a third or additional language (De Angelis’ (2007) term), paying special attention to the use of code-switching and translanguaging. Following Lewis, Jones and Baker (2012, p. 655), it is assumed that translanguaging involves the mobilisation of all of learners’ linguistic resources “to maximise understanding and achievement,” so the learners’ use of languages other than Spanish (especially English, but also e.g. French, Italian, etc.) in the tasks could be assumed to be an example of translanguaging too. Simultaneously, the use of words from languages other than Spanish for lack of a Spanish word could be argued to be more precisely classified as code-switching. Multilingual repertoires are highly complex and, according to Otheguy, García and Reid (2018), multilingual competence is unitary rather than divided into several distinct languages, so, in their view, words are selected from a single lexicon. However, as shown by Williams and Hammarberg (1998), the different languages in multilingual repertoires perform various functions, which gives rise to different types of switches. The study was carried out with English Philology and Romance Philology students studying Spanish as a third or additional language. As the results show, even though the Romance Philology students were generally better at translanguaging, viewed as the use of all their linguistic resources, they avoided switches into other Romance languages, probably to minimise interference. By contrast, the English Philology students, who had lower proficiency in Spanish, were less capable of using their multilingual resources, including English, to provide the missing words, possibly also due to problems with the comprehension of the Spanish sentences.

Źródło:

Theory and Practice of Second Language Acquisition; 2020, 6, 1; 65-106
2450-5455
2451-2125

Pojawia się w:

Theory and Practice of Second Language Acquisition

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Code-Switching Practices among Immigrant Polish L2 Users of English

Autorzy:

Ożańska-Ponikwia, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/783193.pdf

Data publikacji:

2016

Wydawca:

Wydawnictwo Uniwersytetu Śląskiego

Tematy:

code-switching
bilingualism
immersion
L2 use

Opis:

The present paper aims to present a qualitative study on code-switching practices among L2 users immersed in the L2 culture. Code-switching practices were measured among 62 Polish L2 users of English who had immigrated to the UK and Ireland and reported using English on everyday basis. The informants of the study were to answer an open question concerning situations in which they switch from their L2 to L1 most frequently. The analysis of the results reviled that the participants reported code switching mostly in emotionally charged situations as well as when discussing personal topics with known interlocutors.  The results of the study are in line with some quantitative studies (Dewaele, 2010) as well as some autobiographical findings (Grosjean, 2010, Pavlenko, 2004, Wierzbicka, 2004) and shed some more light on a complex notion of bilingualism and code-switching.

Źródło:

Theory and Practice of Second Language Acquisition; 2016, 2, 1
2450-5455
2451-2125

Pojawia się w:

Theory and Practice of Second Language Acquisition

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Zjawiska komutacyjne w biegunowym rezonansowym falowniku napięcia o modulacji typu PWM
Commutation effects in the resonant pole voltage feed inverter with PWM modulation

Autorzy:

Karyś, S.

Powiązania:

https://bibliotekanauki.pl/articles/151854.pdf

Data publikacji:

2012

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

przełączanie miękkie
rezonans
ZCS
soft switching
resonance

Opis:

W artykule przedstawiono problem związany ze zjawiskiem znacznego ograniczenia zakresu komutacji miękkiej w biegunowym falowniku napięcia, przełączanym w warunkach zerowego prądu - ZCS. Na podstawie przeprowadzonej analizy matematycznej oraz badań eksperymentalnych wykazano, że dotychczas stosowana metoda projektowania nie zapewnia warunków miękkiej komutacji dla prądów obciążenia o wartości bliskiej znamionowej. Zauważono, że w falowniku tego typu, wraz ze wzrostem wartości prądu obciążenia, maleje wartość napięcia na kondensatorze obwodu rezonansowego. Wskutek czego wartość maksymalna prądu obciążenia, dla którego spełnione są jeszcze warunki ZCS, jest o około 10% niższa od zakładanej na etapie projektowania wartości elementów obwodu
The paper presents a problem of major limitation of the soft commutation range in the pole voltage inverter, switched on the zero current condition - ZCS. On the base of the mathematical analysis and experimental investigation it has been shown that the design method used up to now does not assure the soft commutation conditions for the load currents of the value close to the nominal. It has been noticed that for the inverter of this type, the voltage value on the resonant circuit capacitor is falling down together with the rise of the load current value. In result, the load current maximum value, for which the ZCS conditions are still fulfilled, is about 10% lower than the value assumed in the design stage of the resonant circuit elements. Ignoring the limitation leads to major increment of the switching loss.

Źródło:

Pomiary Automatyka Kontrola; 2012, R. 58, nr 5, 5; 422-426
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Idiolektalne zróżnicowanie przełączania kodów w dwujęzyczności starowierców regionu suwalsko-augustowskiego

Autorzy:

Głuszkowski, Michał

Powiązania:

https://bibliotekanauki.pl/articles/676762.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Instytut Slawistyki PAN

Tematy:

code‑switching
Old Believers
bilingualism
idiolects
typology

Opis:

Idiolectal diversity of code-switching in the bilingualism of the Old Believers in the region of Suwałki and AugustówThe phenomenon of code-switching is strictly connected with bilingualism – according to Muysken’s theory, we can distinguish three main types of codeswitching: insertional, alternational and congruent lexicalization. Many scholars have attempted to determine the sociological and psychological factors that influence code-switching. This article is based on Franceschini’s concept of prototypical code-switcher. We apply Western sociolinguistic theories to the Slavonic-Slavonic bilingualism in the Old Believers’ community and characterize their code-switchers. On the basis of the linguistic and sociolinguistic material gathered in field researches (1999–2012) we put forward a typology of idiolectal diversity of code-switching in the community of Old Believers’. Идиолектальная дифференциация переключения кодов в двуязычии старообрядцев сувалкcко -августовского регионаЯвление переключения кодов тесно связано с двуязычием. По П. Мюйскену, можно выделить три основных типа переключения кодов: вкрапляющее, альтернирующее и конгруэнтную лексикализацию. Социологические и психологические факторы, влияющие на переключение кодов, старались определить многие исследователи. Для наших рассуждений исходной точкой стал концепт прототипического лица, переключающего коды, принадлежащий Р. Франческини. Автор пытался применить западные социолингвистические теории в описании славяно-славянского билингвизма и охарактеризовать условия переключения кодов в исследуемой им группе. На основании языкового и социолингвистического материала, собранного в рамках полевых исследований (1999–2012), предлагается типология идиолектальных особенностей переключения кодов.

Źródło:

Acta Baltico-Slavica; 2013, 37
2392-2389
0065-1044

Pojawia się w:

Acta Baltico-Slavica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Leksykalne i syntaktyczne elementy rosyjskiej gwary w polszczyźnie staroobrzędowców z Gabowych Grądów i Boru

Autorzy:

Paśko, Dorota

Powiązania:

https://bibliotekanauki.pl/articles/676402.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Instytut Slawistyki PAN

Tematy:

bilingualism
calque
borrowing
code-switching
linguistic contact

Opis:

Lexical and syntactic elements of the Russian dialect in the polish language of the old believers from Gabowe Grądy and BórThe Old Believers living in Poland are descendants of the Old Believers who did not accept the Patriarch Nikon’s reforms in the second half of the 17th century. The villages Gabowe Grądy and Bór are the biggest centers of the Old Believers in Poland. As a result of Polish-Russian bilingualism, we can observe not only the influence of Polish on the Russian dialect, but also the influence of the Russian dialect on the Polish of the Old Believers. Some characteristic features of their Polish which result from the influence of the Russian dialect include: borrowings, calques, hybrids and code-switching.  Лексические и синтаксические элементы русского говора в польском языке старообрядцев из Габовых Грондов и БураСтарообрядцы проживающие в Польше это потомки поселенцев, которые во второй половине ХVII века покидали Россию после реформ Никона. В настоящее время деревни Бур и Габове Гронды являются самыми крупными старообрядческими деревнями в Польше. Их жители употребляют свой русский говор и польский язык попеременно, в зависимости от коммуникативной ситуации и требований коммуникативного партнëра. Для представителей старшего поколения старообрядцев первичным языком является русский говор. На говоре они общаются дома и передают его своим детям. У среднего и младшего поколения польский язык начинает играть бóльшую, чем у старшего роль. Русский говор старообрядцев под влиянием польского языка подвергается гибридизации и его можно даже назвать языком-гибридом. Польское влияние особенно заметно в области лексики (заимствования, кальки, переключение кода). Оно также наблюдается и в несложных высказываниях. Исследование русского говора и польского языка жителей Габовых Грондов и Бура с 1999 года стало проводиться студентами и аспирантами университета им. Николая Коперника в Торуне под руководством проф. Стефана Гжибовского. В результате польско-русского двуязычия отмечено также  влияние русского говора на польский язык старообрядцев, прежде всего в лексике и синтаксисе (заимствования, кальки, гибриды, переключение кода, управление глагола и предлога). Заимствования из русского говора коснулись особенно культуры, традиции, обычаев и религии. Влияние русского говора на польский язык видно не только в речи старшего поколения старообрядцев, также среднего и младшего.

Źródło:

Acta Baltico-Slavica; 2010, 34
2392-2389
0065-1044

Pojawia się w:

Acta Baltico-Slavica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Advanced control and design methods of the auxiliary resonant commutated pole inverter

Autorzy:

Karyś, S.

Powiązania:

https://bibliotekanauki.pl/articles/201964.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

soft switching
ARCP
ZVS
miękkie przełączanie
tranzystor

Opis:

This paper presents several methods that enable the reduction of power loss in the auxiliary resonant commutated pole inverter - ARCP. Presented methods can be divided into static and dynamic ones. The static methods are related to an appropriate design of the inverter, whereas dynamic ones to advanced control of the power transistors. A variety of design and control methods are presented together with their advantages and disadvantages. The new control method of the current in the resonant branch is described. The main benefits of the proposed extended control method and their constrains are shown.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 489-494
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Influence of Eurojargon on Polish meps’ discourse

Autorzy:

Tomaszewska, Aleksandra

Powiązania:

https://bibliotekanauki.pl/articles/540746.pdf

Data publikacji:

2015

Wydawca:

Mazowiecka Uczelnia Publiczna w Płocku

Tematy:

eurojargon
borrowings
code-switching
code-mixing
Anglicisms

Opis:

The purpose of this article is to analyze the influence of the language of EU’s institutions (eurojargon) on the discourse of Polish Members of the European Parliament in the media and during public debates or speeches. The theoretical part presents different academic approaches and chosen literature related to the subject and describes linguistic features of eurojargon in the Polish language. The empirical part is devoted to the qualitative analysis of spoken data of Janusz Lewandowski, Marek Migalski and Jacek Kurski. The analysis focuses on finding the reasons for the usage of eurojargon elements, as well as defining dominating categories of foreign elements in their speeches.

Źródło:

Społeczeństwo. Edukacja. Język; 2015, 3; 197-210
2353-1266
2449-7983

Pojawia się w:

Społeczeństwo. Edukacja. Język

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

INFLUENCE OF EUROJARGON ON POLISH MEPS’ DISCOURSE
WPŁYW EUROŻARGONU NA DYSKURS POLSKICH POSŁÓW DO PARLAMENTU EUROPEJSKIEGO

Autorzy:

Tomaszewska, Aleksandra

Powiązania:

https://bibliotekanauki.pl/articles/1834283.pdf

Data publikacji:

2016-08-12

Wydawca:

Mazowiecka Uczelnia Publiczna w Płocku

Tematy:

eurojargon
borrowings
code-switching
code-mixing
Anglicisms

Opis:

The purpose of this article is to analyze the influence of the language of EU’s institutions (eurojargon) on the discourse of Polish Members of the European Parliament in the media and during public debates or speeches. The theoretical part presents different academic approaches and chosen literature related to the subject and describes linguistic features of eurojargon in the Polish language. The empirical part is devoted to the qualitative analysis of spoken data of Janusz Lewandowski, Marek Migalski and Jacek Kurski. The analysis focuses on finding the reasons for the usage of eurojargon elements, as well as defining dominating categories of foreign elements in their speeches
Celem pracy jest zbadanie wpływu języka instytucji europejskich (eurożargonu)na dyskurs polskich europosłów w mediach, publicznych wystąpieniach i debatach.W części teoretycznej opisano związane z tematem podstawowe zagadnienia i wybranąliteraturę oraz zaprezentowano cechy językowe eurożargonu w języku polskim. Częśćempiryczna jest poświęcona analizie jakościowej wypowiedzi Janusza Lewandowskiego,Marka Migalskiego i Jacka Kurskiego. Analiza dotyczy przyczyn użycia elementóweurożargonu w ich wypowiedziach, a także określenia dominujących w nich kategorii elementówobcych.

Źródło:

Społeczeństwo. Edukacja. Język; 2016, 3; 197-210
2353-1266
2449-7983

Pojawia się w:

Społeczeństwo. Edukacja. Język

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Semilattices with sectional mappings

Autorzy:

Chajda, Ivan
Eigenthaler, Günther

Powiązania:

https://bibliotekanauki.pl/articles/729127.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

semilattice
sectional mapping
antitone mapping
switching mapping
involution

Opis:

We consider join-semilattices with 1 where for every element p a mapping on the interval [p,1] is defined; these mappings are called sectional mappings and such structures are called semilattices with sectional mappings. We assign to every semilattice with sectional mappings a binary operation which enables us to classify the cases where the sectional mappings are involutions and / or antitone mappings. The paper generalizes results of [3] and [4], and there are also some connections to [1].

Źródło:

Discussiones Mathematicae - General Algebra and Applications; 2007, 27, 1; 11-19
1509-9415

Pojawia się w:

Discussiones Mathematicae - General Algebra and Applications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Silicon carbide based DC-DC converter – operating analysis

Autorzy:

Niewiara, Ł.
Tarczewski, T.
Grzesiak, L. M.

Powiązania:

https://bibliotekanauki.pl/articles/377549.pdf

Data publikacji:

2016

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

DC\DC converter
SiC MOSFETS
high switching frequency

Opis:

In this paper operating analysis of DC-DC converter is presented. Silicon Carbide based DC-DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC-DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.

Źródło:

Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 88; 109-119
1897-0737

Pojawia się w:

Poznan University of Technology Academic Journals. Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Multiresonant ZVS boost converter

Autorzy:

Szychta, E.

Powiązania:

https://bibliotekanauki.pl/articles/262727.pdf

Data publikacji:

2005

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

multiresonant converter
zero voltage switching
ZVS
resonant circuits

Opis:

The article presents properties ofmultiresonant voltage-increasing converter to be ! applied in DC voltage supply systems. The configuration of the system elements enables application ! of the technique of zero voltage switching (ZVS) of semi-conductor elements, which yields high operating frequencies of the system while maintaining high energy efficiency and reliability of operation. Results of simulation tests of the converter, based on Simplorer, are discussed. Regulation characteristics are presented and the converter's efficiency is determined.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 65-71
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Crossing Boundaries of Self: Multidimensionality of Ethnic Belongings and Negotiating Identities Among Polish Migrants in Belfast, Northern Ireland

Autorzy:

Kempny, Marta

Powiązania:

https://bibliotekanauki.pl/articles/1929936.pdf

Data publikacji:

2012-03-21

Wydawca:

Polskie Towarzystwo Socjologiczne

Tematy:

belonging
Polishness
small homeland
Europeaness
cosmopolitanism
identity switching

Opis:

This paper discusses multidimensional aspects of identity formation in a European context, referring to Polish migrants’ experiences of migration in Belfast, Northern Ireland. Its aim is to understand the dynamics inherent in the process of identity construction by exploring the incidence of multiple ethnic identities among Polish nationals. To this end, following theoretical consideration on a sense of belonging and boundary making mechanisms in contemporary societies, it examines the incidence of Polish, local, European and cosmopolitan identities among migrants. It then points out at contradictions between different layers of belonging and explores the situations in which they occur. The paper draws on the findings of a one year long ethnographic fieldwork and uses the results of participant observation and in-depth interviews.

Źródło:

Polish Sociological Review; 2012, 177, 1; 55-70
1231-1413
2657-4276

Pojawia się w:

Polish Sociological Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Push-pull resonant DC-DC isolated converter

Autorzy:

Jalbrzykowski, S.
Citko, T.

Powiązania:

https://bibliotekanauki.pl/articles/200421.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

push-pull
DC-DC resonant converter
soft switching

Opis:

A new concept of a DC-DC converter with galvanic isolation is proposed in this paper. The converter belongs to the class E resonant converters controlled by pulse width modulation via frequency regulation (PWM FM). Due to the possibility of operation in the boost and buck modes, the converter is characterized by a high range of voltage gain regulation. The principle of converter operation described by mathematical equations is presented. The theoretical investigations are confirmed by p-spice model simulations and the measurement of an experimental model of 1kW laboratory prototype.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 763-769
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Asymptotic Enumeration of Non-Uniform Linear Hypergraphs

Autorzy:

Hasheminezhad, Mahdieh
McKay, Brendan D.

Powiązania:

https://bibliotekanauki.pl/articles/32361742.pdf

Data publikacji:

2022-02-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

Steiner system
linear hypergraph
asymptotic enumeration
switching method

Opis:

A linear hypergraph, also known as a partial Steiner system, is a collection of subsets of a set such that no two of the subsets have more than one element in common. Most studies of linear hypergraphs consider only the uniform case, in which all the subsets have the same size. In this paper we provide, for the first time, asymptotically precise estimates of the number of linear hypergraphs in the non-uniform case, as a function of the number of subsets of each size.

Źródło:

Discussiones Mathematicae Graph Theory; 2022, 42, 1; 219-230
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Arc models for simulating processes in circuits with a SF6 circuit breaker

Autorzy:

Sawicki, Antoni

Powiązania:

https://bibliotekanauki.pl/articles/140610.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

switching arc
high-voltage circuit breaker
Mayr model

Opis:

This paper demonstrates that if a linear dependence of arc dissipated power on power supplied is introduced at an initial stage of analysis, then, with some simplifying assumptions, the classical Mayr model is obtained. Similarly, if this dependence is taken into account in a model with residual conductance, the modified Mayr model is obtained. The study takes into consideration the local phenomenon of sudden voltage drop accompanying linear current decrease occurring in the circuit breaker. To account for this phenomenon, the Dirac delta function and its approximation by a Gaussian function, representing power or enthalpy disturbances, are introduced to the power balance equation. It is demonstrated that both variants yield the same effect, leading to identical differential equations. Macromodels of the circuit-breaker arc are created and connected with the power source circuit with lin- early decreasing current. The results obtained were found to be consistent with experimental data available in the literature. The models presented are based on a fairly uncomplicated 1st order differential equation and offer a straightforward physical interpretation of the phenomena in question.

Źródło:

Archives of Electrical Engineering; 2019, 68, 1; 147-159
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Modeling and optimization of the YAG:Yb microchip laser passively Q-switched by YAG:Cr absorber

Autorzy:

Buryy, O
Ubizskii, S

Powiązania:

https://bibliotekanauki.pl/articles/175041.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Yb:YAG crystal
microlaser
Q-switching
numerical simulation

Opis:

Based on analytical and numerical solutions of the rate equations system and the heat conductivity equation, the model of the quasi-three-level passively Q-switched YAG:Yb/YAG:Cr microchip laser is developed. The obtained results are used for its optimization, i.e., for the determination of the output mirror reflectivity, the pumping beam radius, the thickness of the absorber and the phototropic centers concentration maximizing the energy in the laser pulse. The influence of the thermal load on the spatial parameters of the laser beam is also determined.

Źródło:

Optica Applicata; 2014, 44, 4; 621-636
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Język polonijny czy języki polonijne?
Polish diaspora language or Polish diaspora languages?

Autorzy:

Lipińska, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/510709.pdf

Data publikacji:

2019

Wydawca:

Wydawnictwo Uniwersytetu Śląskiego

Tematy:

Polish diaspora
Polish diaspora language
interferences
code switching

Opis:

The paper addresses aspects of the language of the Polish diaspora and of the standard language, as forms of language spoken by Poles living abroad. The standard language is/should be common for all Poles – used everywhere and by everyone in the same way. The Polish diaspora language, on the other hand, appears only in specific territories and is used for communication in specific groups of Poles. It differs depending on the country where they settled and on the language it comes into contact with, as well as on the diversity of the emi-grants, and also depending on the Polish they brought from their home coun-try (either them themselves or their parents). Although the terms “Polonia” [Polish diaspora] and “język polonijny” [Polish diaspora language] are com-monly used, one should be aware that the latter are actually numerous.

Źródło:

Postscriptum Polonistyczne; 2019, 2 (24); 189-204
1898-1593
2353-9844

Pojawia się w:

Postscriptum Polonistyczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Performance Comparison of Protection Strategies in WDM Mesh Networks

Autorzy:

Singh, H. K.
Aggarwal, S.
Singh, S.
Mohapatra, B.
Nagaria, R. K.
Tiwari, S.

Powiązania:

https://bibliotekanauki.pl/articles/308073.pdf

Data publikacji:

2010

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

blocking probability
protection
survivability
switching time
WDM networks

Opis:

Recent development in optical networking employing wavelength division multiplexing (WDM) fulfills the high bandwidth demand applications. Failure of such networks, leads to enormous data and revenue loss. Protection is one of the key techniques, which is used in designing survivable WDM networks. In this paper we compare dedicated and shared protection strategies employed inWDMmesh networks to protect optical networks failure, particularly fiber failure. Dijkstra's shortest path algorithm is considered for carrying out simulations. The paper compares the performance of protection schemes, such as, dedicated path protection (DPP), shared path protection (SPP) and shared link protection (SLP) schemes. Capacity utilization, switching time and blocking probability are the parameters considered to measure the performance of the protection schemes. Simulation results show that, SPP is more efficient in terms of capacity utilization over DPP and SLP schemes, whereas, SLP offered better switching time than both DPP and SPP schemes. The average call drop rate is minimum for shared path protection scheme and maximum for shared link protection scheme.

Źródło:

Journal of Telecommunications and Information Technology; 2010, 1; 62-69
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Wpływ szoków naftowych na asymetrię cyklu koniunkturalnego - analiza przełącznikowych modeli Markowa dla państw Unii Europejskiej
Influence of oil price shocks on asymmetry of business cycle: the analysis of Markov switching models for European Union countries

Autorzy:

Geise, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/446717.pdf

Data publikacji:

2015

Wydawca:

Mazowiecka Uczelnia Publiczna w Płocku

Tematy:

business cycle
asymmetry
Markov switching model
cointegration
skewness

Opis:

In the study the Markov-switching models with oil prices to analysis of business cycle asymmetries were considered. We find evidence that business cycles in 1995-2014 were asymmetric in France, Denmark, Poland, Czech Republic and European Union.

Źródło:

Zeszyty Naukowe PWSZ w Płocku. Nauki Ekonomiczne; 2015, 2(22); 411-420
1644-888X

Pojawia się w:

Zeszyty Naukowe PWSZ w Płocku. Nauki Ekonomiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Towards a characterization of bipartite switching classes by means of forbidden subgraphs

Autorzy:

Hage, Jurriaan
Harju, Tero

Powiązania:

https://bibliotekanauki.pl/articles/743415.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

switching classes
bipartite graphs
forbidden subgraphs
combinatorial search

Opis:

We investigate which switching classes do not contain a bipartite graph. Our final aim is a characterization by means of a set of critically non-bipartite graphs: they do not have a bipartite switch, but every induced proper subgraph does. In addition to the odd cycles, we list a number of exceptional cases and prove that these are indeed critically non-bipartite. Finally, we give a number of structural results towards proving the fact that we have indeed found them all. The search for critically non-bipartite graphs was done using software written in C and Scheme. We report on our experiences in coping with the combinatorial explosion.

Źródło:

Discussiones Mathematicae Graph Theory; 2007, 27, 3; 471-483
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

The Viterbi paths in an analysis of business cycle synchronization

Autorzy:

Bernardelli, Michał
Dędys, Monika

Powiązania:

https://bibliotekanauki.pl/articles/500668.pdf

Data publikacji:

2015

Wydawca:

Szkoła Główna Handlowa w Warszawie

Tematy:

Markov switching models
Viterbi path
business cycle synchronization

Opis:

In the paper we investigate possibility of using the Viterbi paths to analyze two-dimensional macroeconomic time series. We build a two-dimensional Gaussian Markov-switching model with a four-state hidden Markov chain. The model is tested with two pairs of monthly indexes of industrial production for: Poland vs. France, and Poland vs. Germany. The most likely sequence of states of the hidden Markov chain is found for each pair. We compare that sequence with analogous sequences determined for a one-dimensional model with a two-state hidden Markov chain. The results of the comparison suggests the four state Viterbi path provides more valuable information about business cycle synchronization between the two economies than two separate two-state Viterbi paths.

Źródło:

Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2015, 97: Economic cycles and uncertainty; 9-23
0866-9503

Pojawia się w:

Prace i Materiały Instytutu Rozwoju Gospodarczego SGH

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Keeping Parties Together? The Evolution of Israel’s Anti-Defection Law

Autorzy:

Nikolenyi, Csaba

Powiązania:

https://bibliotekanauki.pl/articles/594430.pdf

Data publikacji:

2018

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

Knesset
anti-defection law
party switching
party unity

Opis:

In 1991, the Knesset passed a package of legislation with the aim of preventing the rampant party switching and defections by elected representatives. At the time of its adoption, the so-called anti-defection law was supported by an all-party consensus. Although the legislation has remained in effect, its apparent continuity conceals the way in which it has become transformed from what was at first an “efficient” institution to a “redistributive” one (Tsebelis 1990). In this paper, I review the development of the Israeli anti-defection law and argue that whereas at the initial moment of its adoption the anti-defection law was considered to benefit all parties in the system, over time it has become an instrument in the hands of the governing coalition to manipulate divisions and engineer further defections among the opposition in order to shore up its often fragile legislative base.

Źródło:

Polish Political Science Yearbook; 2018, 2 (47); 188-200
0208-7375

Pojawia się w:

Polish Political Science Yearbook

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

АНАЛИЗ ОШИБОК УЧАЩИХСЯ ПОЛЬСКОГО ЯЗЫКА НОСИТЕЛЕЙ УКРАИНСКО-РУССКОГО БИЛИНГВИЗМА

Autorzy:

Chról, Emil

Powiązania:

https://bibliotekanauki.pl/articles/681531.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

Ukrainian-Polish bilingualism, diglossia, linguistic errors, linguistic interference, code switching
ukraińsko-polski bilingwizm, dyglosja, błędy językowe, interferencja językowa, code switching

Opis:

The article offers a sociolinguistic study of Ukrainian-Polish bilingualism with Russian diglossia. The author analyses this specific type of bilingualism on the basis of ten students’ essays and the errors contained in them, revealing the typical reasons behind those errors. In the conclusion part, the author makes suggestions on how to teach Polish language in order to avoid such mistakes.
Obiektem tekstu są błędy, które zauważalne są w procesie nauczania się języka polskiego przez osoby prezentujące bilingwizm ukraińsko-rosyjski z dyglosją. Na podstawie korpusu tekstów w postaci esejów Autor dokonuje analizę błędów i wskazuje na czynniki, które wpływają na kształt błędów językowych. W części końcowej zostały sformułowane porady dotyczące nauczania językowego osób należących do badanej grupy.

Źródło:

Zeszyty Cyrylo-Metodiańskie; 2016, 5
2449-8297

Pojawia się w:

Zeszyty Cyrylo-Metodiańskie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Analiza SIECI IP / MPLS w środowisku symulacyjnym Riverbed
Analysis network IP / MPLS in the simulation environment Riverbed

Autorzy:

Podsiadły, D.
Podsiadły, M.
Krzysztoszek, K.

Powiązania:

https://bibliotekanauki.pl/articles/254331.pdf

Data publikacji:

2016

Wydawca:

Instytut Naukowo-Wydawniczy TTS

Tematy:

Riverbed
Multi-Protocol Label Switching
infrastruktura sieciowa
model ISO/OSI
multi-protocol label switching (MPLS)
network infrastructure
ISO/OSI model

Opis:

W artykule autorzy przedstawili wyniki symulacji w środowisku Riverbed, której celem było zbadanie możliwości zarządzania i efektywności działania ruchu sieciowego stosując technologię Multi-Protocol Label Switching (MPLS). Symulacja zawierała obsługę przepływu danych ftp, email, http oraz aplikacji czasu rzeczywistego jak wideokonferencje oraz głos. Artykuł zawiera wyniki porównania technologii oraz analizę parametrów infrastruktury sieciowej: opóźnienie, zmienność opóźnienia, czas reakcji i charakterystyki TCP.
The paper presented the results of the simulation Riverbed environment, whose aim was to examine the management capabilities and efficiency of the network traffic using Multi-Protocol Label Switching (MPLS) technology. The simulation included support for data flow ftp, email, http, and realtime applications like video conferencing and voice. The paper contains the results of technology comparison and analysis of network infrastructure parameters: delay, delay variation, reaction time and the TCP characteristics.

Źródło:

TTS Technika Transportu Szynowego; 2016, 12; 484-489
1232-3829
2543-5728

Pojawia się w:

TTS Technika Transportu Szynowego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Global Foreign Accent Rating of Code-Switched and L2-Only Sentences

Autorzy:

Šimáčková, Šárka
Podlipský, Václav Jonáš

Powiązania:

https://bibliotekanauki.pl/articles/620764.pdf

Data publikacji:

2016-06-01

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

phonetic interference
bilingual mode
code-switching
voice onset time

Opis:

Recent studies of short-term phonetic interference suggest that code-switching can lead to momentary increases in L1 influence on L2. In an earlier study using a single acoustic measure (VOT), we found that Czech EFL learners’ pronunciation of English voiceless stops had shorter, i.e. more L1-Czech-like, VOTs in code-switched compared to L2-only sentences. The first aim of the current study was to test the prediction that native listeners would judge the code-switched English productions as more foreign-accented than the L2-only productions. The results provide only weak support for this prediction. The second aim was to test whether more native-like VOT values would correlate with improved accentedness scores. This was confirmed for sentence-initial stops.

Źródło:

Research in Language; 2016, 14, 2; 149-164
1731-7533

Pojawia się w:

Research in Language

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

The application of programmable relays in domestic electrical installations

Autorzy:

Piątek, M.

Powiązania:

https://bibliotekanauki.pl/articles/134829.pdf

Data publikacji:

2017

Wydawca:

ADVSEO

Tematy:

automation
electrical power
control
automatic switching
programmable relay
PLC

Opis:

The paper presents the possibilities of using automatic switching, as a system for providing uninterrupted power supply in buildings located in the area of frequent interruptions in the power supply or equipped with renewable energy sources. Apart from the idea of the installation the paper presents an example of the program to control various functions of the system and software for visualization by tracking the availability of some power sources, to simulate their readiness for operation. The main focus is on simplicity and intuition in the use of programs that are available to the average user and can be used and modified from home, eg. a notebook or phone. For the analysis we used a fictitious electrical wiring design of a residential building, which is connected to renewable energy sources. Having selected the appropriate equipment and security, we divided the installation into sections of receiving power in terms of the validity of the power, which includes the automatic control.

Źródło:

Technical Issues; 2017, 2; 3-7
2392-3954

Pojawia się w:

Technical Issues

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Fuzzy switching for multiple model adaptive control in manipulator robot

Autorzy:

Kharabian, B.
Bolandi, H.
Smailzadeh, S. M.
Mousavi Mashhadi, S. K.

Powiązania:

https://bibliotekanauki.pl/articles/384940.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

manipulator robot
fuzzy logic
multiple model
adaptive control
switching

Opis:

In this paper, fuzzy logic is used to perform switching controllers for Multiple Model Adaptive Control (MMAC) in manipulator robot. In the cases which uncertainty bounds of system’s parameters are large, the performance and stability issue of system are considerable concerns. Multiple Model Adaptive Control approach can be useful method to stabilize these kinds of systems. In this control method, the uncertainty bound is divided into several smaller bounds. As a result, the process of stabilization would be streamlined. In this regard, one estimation is obtained for uncertain parameter in every minor bound, and based on estimation errors designed controller can alter. In order to avoid switching controllers and pertinent challenges a summation of controllers with coefficient tuned by fuzzy logic is considered. Simulation results substantiate the efficacy of this method.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 1; 53-56
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Switching Political Affiliation: Electoral-List Mobility in Poland, 2005–2015

Autorzy:

Nyćkowiak, Justyna
Kołodziej, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/1790278.pdf

Data publikacji:

2021-03-22

Wydawca:

Polskie Towarzystwo Socjologiczne

Tematy:

political affiliation
party membership
electoral-list mobility
party switching

Opis:

The goal of this article is to establish (a) the relationship between electoral lists, party membership, and changes in party affiliation in the context of (b) electoral-list mobility. Our basic premise is that the illegible institutional rules for placing candidates on electoral lists favors mobility between lists. We use data from the EAST PaC Database (2005–2015), which allows us to estimate to what extent the composition of electoral lists differs in terms of the party affiliation of candidates and to track the mobility of parliamentary candidates between electoral lists in consecutive elections. Our basic findings confirm that candidates who changed party affiliation and those who were independent were most likely to change electoral lists. This is a quite surprising finding because according to studies (Shabad and Słomczyński 2002, 2004) such candidates, whose election potential is uncertain, should be unwelcome on new electoral lists.

Źródło:

Polish Sociological Review; 2021, 213, 1; 47-70
1231-1413
2657-4276

Pojawia się w:

Polish Sociological Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Combinatorial Properties and Defragmentation Algorithms in WSW1 Switching Fabrics

Autorzy:

Rajewski, Remigiusz
Kabaciński, Wojciech
Al-Tameemi, Atyaf

Powiązania:

https://bibliotekanauki.pl/articles/227184.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

elastic optical network
switching networks
rearrenging algorithm
defragmentation algorithm

Opis:

A spectrum defragmentation problem in elastic optical networks was considered under the assumption that all connections can be realized in switching nodes. But this assumption is true only when the switching fabric has appropriate combinatorial properties. In this paper, we consider a defragmentation problem in one architecture of wavelength-space-wavelength switching fabrics. First, we discuss the requirements for this switching fabric, below which defragmentation does not always end with success. Then, we propose defragmentation algorithms and evaluate them by simulation. The results show that proposed algorithms can increase the number of connections realized in the switching fabric and reduce the loss probability.

Źródło:

International Journal of Electronics and Telecommunications; 2020, 66, 1; 99-105
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Natural convection in a partially heated cylinder: A numerical study

Autorzy:

Núñez, José
Beltrán, Alberto
Rivero, Michel

Powiązania:

https://bibliotekanauki.pl/articles/2055060.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

bifurcations
natural convection
partially heated cylinder
switching modes solutions

Opis:

This work presents a numerical study on a natural convective flow in a cylindrical container heated from below, cooled from above, and partially heated from the lateral wall. Mass, momentum and energy equations were solved with a developed hybrid Fourier-finite volume code and validated with the commercial software COMSOL Multiphysics for steady-state solutions. The primary solutions correspond to steady-states Cm with azimuthal wavenumbers m. The results show mode competition between different states leading to many flow solutions including steady axisymmetric, steady non-axisymmetric, time-dependent pulsating wave solutions, and other flow states with a variety of spatiotemporal symmetries.

Źródło:

Journal of Theoretical and Applied Mechanics; 2021, 59, 4; 623--636
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Design and Development of Biodegradable 3D Printed RDRA for Polarization Reconfigurability

Autorzy:

Apparao, Maganti
Karunakaran, Godi

Powiązania:

https://bibliotekanauki.pl/articles/2200726.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

polarization switching
circular polarization
linear polarization
dielectric resonator antennas

Opis:

In this article, a 3D printed rectangular dielectric resonator antenna which is capable of polarization reconfiguration has been designed. Dielectric resonator is composed of environment friendly and biodegradable material, which is Polylactic Acid. In the proposed model, the polarization can be switch from a linear to a circular by changing the state of a switch, electonically. The antenna switch between two different polarizations: Linear polarization during OFF STATE and Lefthand circular polarization during ON STATE. The proposed 3D printed dielectric resonator antenna is designed to operate in Cband of microwave spectrum, with a broad effective bandwidth (overlapped impedance bandwidths of both states) of 14.542% with centre frequency at 5.845GHz and peak gain 5.5dBi. Further, validated simulated results with experiment and both results are in good agreement.

Źródło:

International Journal of Electronics and Telecommunications; 2023, 69, 1; 69--74
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Przełączanie kodów czy kod mieszany? Aktualny stan bilingwizmu staroobrzędowców w regionie suwalsko-augustowskim

Autorzy:

Głuszkowski, Michał

Powiązania:

https://bibliotekanauki.pl/articles/676856.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Slawistyki PAN

Tematy:

Old Believers
bilingualism
code-switching
code-mixing
mixed code

Opis:

Code-switching or a mixed code? The present situation of the old believers' bilingualism in the Suwałki–Augustów region Old Believers’ in the Suwałki–Augustów region constitute a bilingual community. They simultaneously use the Polish language and the Russian dialect. We observe numerous cases of code-switching, i.e. intersentential switches and functionally meaningful intrasentential switches between two languages (between clauses or phrases in a clause), as well as code-mixing, i.e. switches inside simpler units. According to Peter Auer, the phenomenon of code-mixing may bring to the origin of a fused lect. The text is an attempt to describe the present situation of the Polish Old Believers’ bilingualism and answer the question if their dialect has already become a mixed code. The analysis is basing on the linguistic and sociolinguistic material gathered during scientific expeditions to the Old Believers’ settlements in North-Eastern Poland in the years 1999–2011. Актуальная ситуация билингвзма старообрядцев в сувальско-августовском регионеСтарообрядцы в сувальско-августовском регионе образуют двуязычную общину. Они попеременно пользуются польским языком и русским диалектом. В их речи наблюдаются многочисленные случаи переключения кодa, т.е. смены языка высказывания между предложениями, на стыке придаточных предложений и других функционально значимых синтаксических единиц, а также смешение кодов, т.е. смены языка внутри меньших единиц. Согласно положениям П. Ауэра, смешение кодов может привести к образованию смешанного кода (fused lect). Данная статья является попыткой определить состояние билингвизма польских старообрядцев, а также дать ответ на вопрос о возможном образовании смешанного кода на основании русского говора. Анализ опирается на языковые и социолингвистические данные, собранные во время научных экспедиций в старообрядческих местностях северо-восточной Польши в 1999–2011 гг. 

Źródło:

Acta Baltico-Slavica; 2012, 36
2392-2389
0065-1044

Pojawia się w:

Acta Baltico-Slavica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

An Overview of Mobility Management Mechanisms and the Related Challenges in 5G Networks and Beyond

Autorzy:

Alkalsh, Mustafa Mohammed Hasan

Powiązania:

https://bibliotekanauki.pl/articles/24200735.pdf

Data publikacji:

2023

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

B5G
beam switching
handover
HetNet
mobility management

Opis:

Ensuring a seamless connection with various types of mobile user equipment (UE) items is one of the more significant challenges facing different generations of wireless systems. However, enabling the high-band spectrum – such as the millimeter wave (mmWave) band – is also one of the important factors of 5G networks, as it enables them to deal with increasing demand and ensures high coverage. Therefore, the deployment of new (small) cells with a short range and operating within the mmWave band is required in order to assist the macro cells which are responsible for operating long-range radio connections. The deployment of small cells results in a new network structure, known as heterogeneous networks (HetNets). As a result, the number of passthrough cells using the handover (HO) process will be dramatically increased. Mobility management (MM) in such a massive network will become crucial, especially when it comes to mobile users traveling at very high speeds. Current MM solutions will be ineffective, as they will not be able to provide the required reliability, flexibility, and scalability.Thus, smart algorithms and techniques are required in future networks. Also, machine learning (ML) techniques are perfectly capable of supporting the latest 5G technologies that are expected to deliver high data rates to upcoming use cases and services, such as massive machine type communications (mMTC), enhanced mobile broadband (eMBB), and ultra-reliable low latency communications (uRLLC). This paper aims to review the MM approaches used in 5G HetNets and describes the deployment of AI mechanisms and techniques in ″connected mode″ MM schemes. Furthermore, this paper addresses the related challenges and suggests potential solutions for 5G networks and beyond.

Źródło:

Journal of Telecommunications and Information Technology; 2023, 2; 53--62
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Long lasting transients in power filter circuits

Autorzy:

Warecki, J.
Gajdzica, M.

Powiązania:

https://bibliotekanauki.pl/articles/97714.pdf

Data publikacji:

2014

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

inrush current
arc fumace transformer
harmonic filter
switching transient

Opis:

The practice of operating AC electrical arc fumace power supply systems has shown that energizing unloaded fumace transformer can cause long lasting transients in filter circuits of static VAR compensators used in the supply systems. Examination of the supply system configuration impact on switching transient behaviour has been carried out by example of a 50 MVA arc fumace unit. The transient analysis has been carried out through simulating by Matlab/Simulink software.

Źródło:

Computer Applications in Electrical Engineering; 2014, 12; 324-333
1508-4248

Pojawia się w:

Computer Applications in Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

A current-source concept for fast and efficient driving of silicon carbide transistors

Autorzy:

Rąbkowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/141047.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

silicon carbide transistors
gate drivers
current-source
switching process

Opis:

The paper discusses the application of the current-source concept in the gate drivers for silicon carbide transistors. There is a common expectation that all SiC devices will be switched very fast in order to reach very low values of switching energies. This may be achieved with the use of suitable gate drivers and one of possibilities is a solution with the current source. The basic idea is to store energy in magnetic field of a small inductor and then release it to generate the current peak of the gate current. The paper describes principles of the current-source driver as well as various aspects of practical implementation. Then, the switching performance of the driven SiC transistors is illustrated by double-pulse test results of the normally-ON and normally-OFF JFETs. Other issues such as problem of the drain-gate capacitance and power consumption are also discussed on the base of experimental results. All presented results show that the currentsource concept is an interesting option to fast and efficient driving of SiC transistors.

Źródło:

Archives of Electrical Engineering; 2013, 62, 2; 333-343
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Development of energy-efficient IBC with IGBT module for photovoltaic applications

Autorzy:

Kumar, C. Prasanna
Rao, Anand

Powiązania:

https://bibliotekanauki.pl/articles/1193903.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

interleaved boost converter
efficiency
stability
power converter
switching frequency

Opis:

The proposed study is improvised value-engineered modifications for the basic interleaved boost converter (IBC) by including relevant modifications in circuits, which is expected for a better performance in switching with reduction in losses. The newly modified IBC circuit with insulated gate bipolar transistor (IGBT) along with converter has been experimented by simulations and the results are tabulated to modified IBC with metal oxide silicon field effect transistors. Further experimental analysis and validations of the proposed simulation with hardware developed adopting model SKM195GB066D consisting of IGBTs is presented. This study further enhances and summarises the optimum utilisation and the performance of IBC with the proposed IGBT modules that synchronises power diode. Enhancing the simulation outcomes, the hardware is proposed and developed to be tested for a load up to 1.5 kW with the evaluation of key parameters such as efficiency of the converter.

Źródło:

Power Electronics and Drives; 2020, 5, 40; 73-81
2451-0262
2543-4292

Pojawia się w:

Power Electronics and Drives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Multiresonant ZVS CUK convertor

Autorzy:

Szychta, E.

Powiązania:

https://bibliotekanauki.pl/articles/262827.pdf

Data publikacji:

2006

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

multiresonant converter
cuk circuit
zero voltage switching
resonant circuits

Opis:

The article presents properties of multiresonant ZVS Cuk converter. The control system of the converter is based on PWM technique. The operating range of the converter is defined where ZVS operation is assured. Control characteristics are given and the converter’s efficiency is defined. The converter’s operation is analysed on the basis of simulation testing.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 95-101
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Effect of market participation on household welfare among smallholder goat farmers in Botswana

Autorzy:

Ngwako, Gomolemo
Mthenge, Mary
Gido, Eric
Kgosikoma, Keneilwe

Powiązania:

https://bibliotekanauki.pl/articles/1879450.pdf

Data publikacji:

2021-07-04

Wydawca:

Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane

Tematy:

market participation
endogenous switching regression
household welfare
smallholder farmers

Opis:

Goat farming is a major livelihood activity for most smallholder farmers in Botswana. To ensure sustainable livelihoods for these farmers, a shift from the prevalent traditional and subsistence system to a more market-oriented one is considered necessary. Market participation is widely viewed as an effective means of addressing poverty which is particularly rampant in most rural areas of Botswana and other developing countries. Little evidence is however available on the link between market participation and household welfare, especially among livestock and, in particular, small stock farmers. This paper evaluates the effect of market participation on household welfare among smallholder goat farmers. Estimating an endogenous switching regression model, the results show a positive and significant effect of market participation on household income for both participant and non-participant farmers. This effect was found to be more pronounced among the non-participants had they decided to sell. The results suggest that goat farmers should be encouraged to engage in market participation other than their traditional ways of keeping goats. This implies that existing policies and programs that increase market participation and encourage market-oriented farming should be revised in order to provide efficient and sustainable support. Furthermore, the study recommends that information on goat markets should reach rural areas where most farmers reside and are unable to access technology.

Źródło:

Journal of Agribusiness and Rural Development; 2021, 60, 2; 151-160
1899-5241

Pojawia się w:

Journal of Agribusiness and Rural Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Party Switching as a Media Phenomenon in the Election Campaign

Autorzy:

Kołodziej, Szymon

Powiązania:

https://bibliotekanauki.pl/articles/514610.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Śląski. Wydział Nauk Społecznych

Tematy:

party switching
mediatization
types of politicians
political transfer
Polska

Opis:

The article presents changes that take place in mass media during and after the party switching. The main reason why politicians are changing „their colors” - is that they want to become the celebrities. This work is an attempt of research about possible motivation of those figures. It is also important to consider if exist characteristic features that are assigned to identified political types?

Źródło:

Political Preferences; 2015, 11; 93-106
2449-9064

Pojawia się w:

Political Preferences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Criticality of Switching Classes of Reversible 2-Structures Labeled by an Abelian Group

Autorzy:

Belkhechine, Houmem
Ille, Pierre
Woodrow, Robert E.

Powiązania:

https://bibliotekanauki.pl/articles/31342140.pdf

Data publikacji:

2017-02-01

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

labeled and reversible 2-structure
switching class
clan
primitivity
criticality

Opis:

Let $V$ be a finite vertex set and let $(\mathbb{A}, +)$ be a finite abelian group. An $ \mathbb{A} $-labeled and reversible 2-structure defined on $V$ is a function $ g : (V \times V) \backslash \{ (v, v) : v \in V \} \rightarrow \mathbb{A} $ such that for distinct $ u, v \in V, g(u, v) = −g(v, u) $. The set of $ \mathbb{A} $-labeled and reversible 2-structures defined on $V$ is denoted by $ \mathcal{L} (V, \mathbb{A} ) $. Given $g \in \mathcal{L} (V, \mathbb{A}) $, a subset $X$ of $V$ is a clan of $g$ if for any $x, y \in X$ and $ v \in V \backslash X, g(x, v) = g(y, v) $. For example, $ \emptyset $, $V$ and $ \{ v \} $ (for $v \in V $) are clans of $g$, called trivial. An element $g$ of $ \mathcal{L} (V, \mathbb{A}) $ is primitive if $ |V| \ge 3 $ and all the clans of $g$ are trivial. The set of the functions from $V$ to $ \mathbb{A} $ is denoted by $ (V, \mathbb{A} ) $. Given $ g \in \mathcal{L} (V, \mathbb{A} ) $, with each $ s \in (V, \mathbb{A})$ is associated the switch $ g^s $ of $g$ by $s$ defined as follows: given distinct $x, y \in V $, $g^s(x, y) = s(x) + g(x, y) − s(y) $. The switching class of $g$ is $ \{ g^s : s \in \mathcal{S} (V, \mathbb{A} ) \} $. Given a switching class $ \mathfrak{G} \subseteq \mathcal{L} (V, \mathbb{A} ) $ and $ X \subseteq V $, \( \{ g_{ \upharpoonright (X \times X) \backslash \{ (x,x):x \in X \} } : g \in \mathfrak{G} \} \) is a switching class, denoted by $ \mathfrak{G} [X] $. Given a switching class $ \mathfrak{G} \subseteq \mathcal{L} (V, \mathbb{A} ) $, a subset $X$ of $V$ is a clan of $ \mathfrak{G} $ if $X$ is a clan of some $ g \in \mathfrak{G} $. For instance, every $ X \subseteq V $ such that $ min (|X|, |V \backslash X | ) \le 1 $ is a clan of $ \mathfrak{G} $, called trivial. A switching class $ \mathfrak{G} \subseteq \mathcal{L}(V, \mathbb{A} ) $ is primitive if $ |V | \ge 4 $ and all the clans of $ \mathfrak{G} $ are trivial. Given a primitive switching class $ \mathfrak{G} \subseteq \mathcal{L} (V, \mathbb{A} ) $, $ \mathfrak{G} $ is critical if for each $ v in V $, $ \mathfrak{G} − v $ is not primitive. First, we translate the main results on the primitivity of $ \mathbb{A} $-labeled and reversible 2-structures in terms of switching classes. For instance, we prove the following. For a primitive switching class $ \mathfrak{G} \subseteq \mathcal{L}(V, \mathbb{A})$ such that $|V| \ge 8$, there exist $ u, v \in V$ such that $ u \ne v$ and $ \mathfrak{G} [V \backslash \{ u, v \} ]$ is primitive. Second, we characterize the critical switching classes by using some of the critical digraphs described in [Y. Boudabous and P. Ille, Indecomposability graph and critical vertices of an indecomposable graph, Discrete Math. 309 (2009) 2839–2846].

Źródło:

Discussiones Mathematicae Graph Theory; 2017, 37, 1; 175-209
2083-5892

Pojawia się w:

Discussiones Mathematicae Graph Theory

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Języki mniejszości
Minority Languages

Autorzy:

Pidkujmucha, Ludmyła

Powiązania:

https://bibliotekanauki.pl/articles/38454284.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Instytut Slawistyki PAN

Tematy:

język mniejszości
przełączenie kodów
dwujęzyczność
minority language
code-switching
bilingualism

Opis:

This review presents an academic textbook by Helena Krasowska. The article outlines issues discussed in the work, and presents the reviewer’s theoretical and practical observations, which are based on her own empirical research.
Recenzja przedstawia podręcznik akademicki autorstwa Heleny Krasowskiej. Zostały tu omówione zarówno poszczególne zagadnienia poruszane w pracy, jak również teoretyczne i praktyczne rozważania, którymi autorka dzieli się na podstawie własnych badań empirycznych.

Źródło:

Acta Baltico-Slavica; 2021, 45
2392-2389
0065-1044

Pojawia się w:

Acta Baltico-Slavica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

In the Search for Grammatical Explanations of the Code-Switching. Empirical Verification of Selected Syntactic Constraints and the Triggering Hypothesis

Autorzy:

Długosz, Kamil

Powiązania:

https://bibliotekanauki.pl/articles/605528.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

Code-Switching
Syntax des Code-Switching
Auslösewörter
syntaktische Beschränkungen des Code-Switching
Mehrsprachigkeit
mentale Prozesse, mentale Sprachrepräsentation
code-switching
syntax of code-switching
bilingualism, trigger-words
syntactic constraints of the code-switching
mental processes
mental representation
Mots-clés:l’artenance codique
syntaxe de l’alternance codique
le bilinguisme, mots-déclencheurs
contraintes syntaxiques de l’alternance codique
processus mentaux
une représentation mentale
код коммутации
синтаксис кода коммутации
двуязычие, инициирующее слово
синтаксические ограничения кода коммутации
умственные процессы
ментальное представление

Opis:

Code-Switching ist ein Sprachkontaktphänomen und besteht in einem Wechsel zwischen zwei oder mehreren Sprachen bzw. Sprachvarietäten innerhalb einer Äußerung und kann entweder unbewusst oder bewusst ablaufen. Das Ziel des vorliegenden Artikels ist es, ausgewählte syntaktische Beschränkungen des Code-Switching, so wie sie in der Fachliteratur diskutiert werden, zur Debatte zu stellen und anhand einer Transkription eines Interviews mit dem berühmten Neurobiologen Eric Kandel (2011) empirisch zu überprüfen. Einer empirischen Überprüfung wird ebenfalls die Triggering-Hypothese (M. Clyne, 1967) unterzogen.
Code-switching appears among multilingual speakers and means switching fluently from one language to another. Since the 70s some research have been carried out on code-switching from the syntactic point of view. Its main purpose is to determine in which parts of a sentence code-switching cannot appear. The aim of the present study is to verify empirically the selected grammatical constraints on code-switching as well the Triggering-Hypothesis (Clyne 1967) on the basis of an interview transcript with a famous neurobiologist Eric Kandel.
Le numéro contient uniquement des résumés en anglais et en allemand.
Том не содержит аннотаций на русском языке.

Źródło:

Lublin Studies in Modern Languages and Literature; 2016, 40, 1
0137-4699

Pojawia się w:

Lublin Studies in Modern Languages and Literature

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Reliability analysis of N-policy vacation-based FTC system subject to standby switching failures

Autorzy:

Kumar, Sudeep
Gupta, Ritu

Powiązania:

https://bibliotekanauki.pl/articles/27315336.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

reliability
standby switching failure
N-policy
server breakdown
optional service

Opis:

The paper is aimed to investigate the reliability metrics of a multi-unit fault-tolerant control (FTC) system wherein the units are subject to failure and those are repairable by two heterogeneous servers. Server 1 remains permanently available for essential service of failed units, whereas server 2 goes on vacation and renders service based on the N-policy threshold, which may also provide optional and essential services. Server 1 may break down at a steady rate during its servicing period but immediately gets repaired and resume servicing the failed units. When the working unit fails, the available warm standby unit holds responsibility for the smooth operation of the system. The transition of standby units to operational mode may be unsuccessful with switching failure probability. We develop a Markovian model to obtain the steady-state probabilities. We explore computational and sensitivity analysis of different performance measures for various variability of the parameters.

Źródło:

Operations Research and Decisions; 2023, 33, 2; 53--80
2081-8858
2391-6060

Pojawia się w:

Operations Research and Decisions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Analiza narażeń przepięciowych transformatorów średnich napięć generowanych podczas czynności łączeniowych
Analysis of overvoltage risks of medium voltage transformers generated during switching operations

Autorzy:

Furgał, J.
Pająk, P.

Powiązania:

https://bibliotekanauki.pl/articles/268252.pdf

Data publikacji:

2009

Wydawca:

Politechnika Gdańska. Wydział Elektrotechniki i Automatyki

Tematy:

transformatory
przepięcia łączeniowe
modelowanie matematyczne
transformers
switching overvoltages
mathematical modelling

Opis:

W artykule przedstawiono analizę narażeń przepięciowych transformatorów rozdzielczych. Podstawą analizy były wyniki symulacji komputerowych oraz wyniki badań przepięć generowanych podczas wyłączania transformatorów wyłącznikami próżniowymi. Analizaowano wpływ ograniczników przepięć z tlenków metali na przepięcia łączeniowe.
The paper presents analysis of overvoltage risks of transformers. This analysis is based on results of computer simulation and the investigations results of overvoltages generated during switching off by vacuum breakers. Influence of metal oxide surge arresters was analysed on base of the investigation results.

Źródło:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2009, 26; 37-40
1425-5766
2353-1290

Pojawia się w:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Badanie właściwości elementów mocy z węglika krzemu w zastosowaniach układowych
Studies of silicon carbide power devices properties in application circuits

Autorzy:

Łykowski, A.
Szewczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/268568.pdf

Data publikacji:

2015

Wydawca:

Politechnika Gdańska. Wydział Elektrotechniki i Automatyki

Tematy:

przetwornica impulsowa
węglik krzemu
silicon carbide power devices
switching converter

Opis:

W artykule prezentowane są wyniki badania właściwości elementów SiC w zastosowaniach układowych. Do celów pomiarowych zaprojektowano układ przetwornicy realizujący konfigurację buck oraz boost z elementami aktywnymi z SiC oraz z krzemu, jako elementami referencyjnymi. Układ przetwornicy był badany dla różnych zestawów elementów, konfiguracji i parametrów pracy.
The paper presents results of study on Silicon Carbide power devices applications in circuits. For this purpose the model of switching converter was designed and fabricated. The model allows application of both, buck and boost architecture. As a reference elements, typical silicon power devices were used. For SiC and Si devices the efficiency and disturbance level was measured. For boost architecture the highest efficiency was noticed for SiC devices, while for bust architecture the efficiency for those devices was lower. For both cases generated disturbances were lowest while Silicon carbide devices were used.

Źródło:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2015, 46; 73-76
1425-5766
2353-1290

Pojawia się w:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Switching regression models with non-normal errors
Modele regresji przełącznikowej ze składnikami losowymi o rozkładach rożnych od normalnego

Autorzy:

Pruska, Krystyna

Powiązania:

https://bibliotekanauki.pl/articles/904609.pdf

Data publikacji:

1997

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

switching regression models
maximum likelihood method
pseudo maximum likelihood method

Opis:

In this paper two forms of switching regression models with non-normal errors are considered. The pseudo maximum likelihood method is proposed for the estimation of their parameters. Monte Carlo experiments results are presented for a special switching regression model, too. In this research there are compared distributions of parameters estimators for different distributions of errors. The error distributions are as follows: normal, Student’s or Laplace’s. The maximum likelihood method (for the normal errors) is applied to the estimation. In most of the cases the estimators distributions do not differ significantly.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 1997, 141
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Adaptation to different types of cognitive conflict. Are there common mechanisms?

Autorzy:

Siedlecka, Marta
Śmigasiewicz, Kamila

Powiązania:

https://bibliotekanauki.pl/articles/637758.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego

Tematy:

cognitive control, conflict monitoring, conflict adaptation, task-switching, flanker task

Opis:

One of the functions of cognitive control is to detect difficulties in information processing and adjust the level of performance. This article presents study on confl ict adaptation in which we investigated how detection of cognitive conflict influences behaviour on a subsequent trial. In two experiments we aimed to find out whether the adjustment can be carried out across two kinds of cognitive conflicts: between competing responses and requirements of two tasks. The modified version of the flanker task in switching paradigm was used so that participants had to switch between two tasks that shared the same stimulus set. The results showed that the two kinds of confl icts did not interact with each other. Furthermore, each conflict evoked conflict adaptation, but this adaptation did not occurred across conflicts. This suggests that conflict adaptation covers a set of mechanisms functioning uniquely in one domain.

Źródło:

Rocznik Kognitywistyczny; 2015, 8
1689-927X

Pojawia się w:

Rocznik Kognitywistyczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Relationship between the verbal fluency and academic achievement in second and third grade students: the effects of gender and parents’ educational level

Autorzy:

Aksamovic, Armina
Djordjevic, Mirjana
Malec, Daniel
Memisevic, Haris

Powiązania:

https://bibliotekanauki.pl/articles/2106162.pdf

Data publikacji:

2019-06-20

Wydawca:

Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica

Tematy:

verbal fluency
academic success
clustering and switching
school-aged children

Opis:

Verbal fluency is an important skill related to academic success. Many studies have indicated a strong link between verbal fluency and cognitive processes. The exact nature and size of the relationship between verbal fluency and academic success has not been extensively explored. Thus, the goal of the present study was to examine the relationship between verbal fluency, including its components clustering and switching, with academic success in a sample of second and third grade elementary school students. In addition to this, we examined the effects of gender and the parents’ level of education on verbal fluency. The sample for this study consisted of 61 second and third grade students (39 boys and 22 girls) attending two regular schools in the Mostar region, Bosnia and Herzegovina. Children were given tests of both semantic fluency and phonetic fluency. Teachers’ ratings were used as a measure of the children’s academic success. The results of this study indicated the strong link between verbal fluency and academic success. Components of verbal fluency, clustering and switching had a small effect on academic achievement. There was no effect of gender on verbal fluency and academic success. On the other hand, the parents’ level of education had a strong effect on both, verbal fluency and academic success. Verbal fluency, defined as the total number of words retrieved, is strongly related to academic success. Clustering and switching, as two components of verbal fluency, have a limited value in predicting academic achievement. However, the parents’ educational level is strongly related to academic success.

Źródło:

Acta Neuropsychologica; 2019, 17(2); 139-150
1730-7503
2084-4298

Pojawia się w:

Acta Neuropsychologica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Wpływ pojemności pasożytniczych transoptora na sterowanie tranzystorami w przekształtniku impulsowym
The impact of optocoupler parasitic capacitance on transistors control in switching converter

Autorzy:

Cisek, M.

Powiązania:

https://bibliotekanauki.pl/articles/275726.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

przekształtnik impulsowy
transoptor
zakłócenia
CMRR
CMTI
switching converter
optocoupler
distortions

Opis:

W przekształtnikach impulsowych konieczna jest separacja galwaniczna między obwodami bramkowymi tranzystorów a sterownikiem mikroprocesorowym. Separacja realizowana jest najczęściej przy użyciu transoptorów. W transoptorach występują pojemności pasożytnicze sprzęgające obwód wyjściowy i wejściowy układu. Wpływ tych pojemności jest w większości zastosowań pomijalny, jednak w układach impulsowych, w których potencjały obwodów wejściowego i wyjściowego transoptora ulegają bardzo szybkim zmianom, występowanie pojemności pasożytniczych może prowadzić do powstawania zakłóceń sygnałów sterujących tranzystorami. W artykule omówiono budowę, najważniejsze cechy i parametry transoptorów cyfrowych. Przedstawiono przyczyny i miejsca występowania pojemności pasożytniczych. Opracowano model symulacyjny transoptora uwzględniający pojemności pasożytnicze. Przedstawiono wyniki badań symulacyjnych obrazujących wpływ pojemności oraz szybkości zmian napięcia na przebieg sygnału sterującego tranzystorem. Przedstawiono wybrane wyniki weryfikacji laboratoryjnej.
Optocouplers are widely used, e.g. in the switching converters, in which they are used to obtain electrical isolation between gate transistors circuits and microprocessor controller. In transoptors exists parasitic capacitances which couples output and input circuits of the system. The influence of these capacitances is negligible for most applications. However, in switching converters, where the potentials of the input and output circuit of an optocoupler changes very fast, the presence of parasitic capacitances can lead to the distortion of transistors control signals. The paper discusses the general structure, key features and parameters of digital optocouplers. Cause and location of parasitic capacitances was shown in a simulation model of optocoupler, which takes into account the parasitic capacitances was designed. Simulation results illustrating the impact of capacitance and rate of voltage change to waveform of the transistors control signals were presented. Shows selected results of laboratory verification were shown.

Źródło:

Pomiary Automatyka Robotyka; 2014, 18, 7-8; 86-92
1427-9126

Pojawia się w:

Pomiary Automatyka Robotyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Discourse as a language contact phenomenon: evidence from Mexican-American bilinguals

Autorzy:

Pawliszko, Judyta

Powiązania:

https://bibliotekanauki.pl/articles/474133.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Warszawski i Uniwersytet Rzeszowski

Tematy:

Mexican-American immigrants
Spanish-English discourse
ode-switching
iscourse strategies

Źródło:

tekst i dyskurs - text und diskurs; 2019, 12; 85-98
1899-0983

Pojawia się w:

tekst i dyskurs - text und diskurs

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Switching median filter with a local entropy control

Autorzy:

Lukac, R.
Smolka, B.
Bieda, R.
Budzan, S.

Powiązania:

https://bibliotekanauki.pl/articles/333245.pdf

Data publikacji:

2003

Wydawca:

Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych

Tematy:

zakłócenia impulsowe
nieliniowa filtracja
impulsive noise
nonlinear filtering
switching median filter

Opis:

This paper presents a new switching median filter utilising local contrast entropy of the samples inside the filtering window. The proposed method is fully adaptive, it requires no optimisation and eliminates the main disadvantages of the local contrast probability based switching median. Excellent performance of the proposed method is a result of the successful analysis of input samples, as the local contrast entropy concept is able to efficiently differentiate between outliers and desired edge samples.

Źródło:

Journal of Medical Informatics & Technologies; 2003, 5; MI39-46
1642-6037

Pojawia się w:

Journal of Medical Informatics & Technologies

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Zmiany w czasie reguły Taylora a polityka pieniężna w Polsce
Polish monetary policy through the lens of regime switching Taylor rule

Autorzy:

Baranowski, Paweł
Sztaudynger, Jan Jacek

Powiązania:

https://bibliotekanauki.pl/articles/425086.pdf

Data publikacji:

2016

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

Taylor rule
dynamic general equilibrium models
regime switching models
monetary policy

Opis:

The goal of the paper was to verify the stability of Taylor rule parameters. The empirical analysis was performed for Poland; using 1996-2016 monthly data. More specifically, we verify two hyphotheses: (1) the behaviour of interest rate can be described using Taylor rule; (2) the Taylor rule with parameters subject to Markov switching performs better than the one with constant parameters. We take a system approach, where a Taylor rule is a part of small scale DSGE model. The bayesian inference is used to estimate the model and compare the specifications. The results indicate that models with switching parameters are better in terms of marginal data density. The best model is based on forward looking Taylor rule, where the parameters expressing the magnitude of the reaction to inflation and output gap were subject to Markov switching, while interest rate smoothing was constant. The identified regime switching can be interpreted as not responsing for inflation below the tar-get (opportunistic disinflation declared for 2001-2002 by Polish monetary authorities) or not responding to inflation driven mostly by EU accression (2004-2005) or increased VAT (2004-2005, 2011).

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2016, 3 (53); 9-20
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Identification of financial and macroeconomic shocks in a VAR model of the Polish economy. A stability analysis

Autorzy:

Ulrichs, Magdalena

Powiązania:

https://bibliotekanauki.pl/articles/943099.pdf

Data publikacji:

2018-03-30

Wydawca:

Uniwersytet Ekonomiczny w Poznaniu

Tematy:

VAR models
impulse response functions
Markov‑Switching VAR models
structural changes

Opis:

Dynamic macroeconomic models (both VAR and DSGE) currently play a very significant role in macroeconomic modelling. But these types of models rarely take into account the impact of financial markets on the behaviour of economies, they are rather more focused on the monetary transmission mechanism. The financial crisis of 2007-2008 highlighted the impact of the financial market on the macroeconomy. In this context macroprudential policy and financial stability analysis has gained a stronger meaning. The main aim of the paper is to estimate a model that simultaneously explains the dynamics of macroeconomic and financial variables and to assess whether the identified relationships are stable over time. Therefore, based on the estimated empirical structural vector autoregression model explaining the interactions between the real economy, the financial system and monetary policy in Poland, financial and macroeconomic shocks were identified. It was shown that the impulse reaction functions changed after the financial crisis. On the basis of Markov‑Switching vector autoregression model probabilities of transitions between states of the economy and the regime-dependent impulse reaction functions were estimated.

Źródło:

Economics and Business Review; 2018, 4(18), 1; 29-43
2392-1641

Pojawia się w:

Economics and Business Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Nonlinear optics of the thin-film quasiwaveguide amplifier: applications to directional switching in the optical communication systems

Autorzy:

Djotyan, G.P.
Arutunyan, V.M.
Bakos, J.S.
Sörlei, Z.

Powiązania:

https://bibliotekanauki.pl/articles/308725.pdf

Data publikacji:

2000

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

thin-film laser
directoral switching
four-wave mixing
optical communication systems

Opis:

We examine nonlinear optical effects in the active medium of the thin-film quasiwaveguide amplifier-oscillator with injection of the external signal. The injection locking has been obtained in the case when both the frequency and the direction of propagation of the injected signal differ from those for a free-running thin-film laser which offers a possibility for the frequency and directional switching of the output of the thin-film laser. The effects of four wave mixing and phase conjugation have been discussed in the active medium of the thin-film laser when additional mirrors forming an external resonator have been used.

Źródło:

Journal of Telecommunications and Information Technology; 2000, 1-2; 20-23
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Haunted Bodies: Cell Switching, Getting Lost and Adaptive Geographies

Autorzy:

Grant, Jane
Whalley, Joanne “Bob”

Powiązania:

https://bibliotekanauki.pl/articles/632564.pdf

Data publikacji:

2017

Wydawca:

Projekt Avant

Tematy:

: boundary
cell switching
hauntings
heteropathic exchange
sonic memory
surface
symbiogenesis
transfection

Opis:

This article proposes the ideas of stochastic resonance and noise as devices with which to think of the body or self as plural and porous. Boundaries and surfaces are proposed as indefinite; cell switching and narratives of the self are discussed in relation to external forces, via Arendt’s inter-subjectivity and La Celca’s colonization as infection. The sonic artwork Ghost, which uses models of spiking neurons to materialize endogenous and exogenous composition in relation to noise and sonic memory is presented as an exploration of the boundary or limit of the notion of self. This paper, which serves as a cogitatum (a force) rather than cognitio (the result), articulates the human body as a complex and open system that steers towards chaos by adapting and accepting further complexity as, and within, constantly adaptive networks of creativity. We suggest that by focusing on the porosity of boundaries and the mechanisms that underlie their permeability, problems around identity and subjectivity might be seen in a new light.

Źródło:

Avant; 2017, 8
2082-6710

Pojawia się w:

Avant

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Modelling and simulation of sinusoidal pulse width modulation controller for solar photovoltaic inverter to minimize the switching losses and improving the system efficiency

Autorzy:

Panneerselvam, Sivaraj
Kandasamy, Karunanithi
Perumal, Chandrasekar

Powiązania:

https://bibliotekanauki.pl/articles/2135736.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

efficiency
IGBT
MOSFET
PV inverter
MATLAB/SIMULINK
SPWM controller
switching loss

Opis:

With the extinction of fossil fuels and high increase in power demand, the necessity for renewable energy power generation has increased globally. Solar PV is one such renewable energy power generation, widely used these days in the power sector. The inverters used for power conversion suffer from power losses in the switching elements. This paper aims at the detailed analysis on switching losses in these inverters and also aims at increasing the efficiency of the inverter by reducing losses. Losses in these power electronic switches vary with their types. In this analysis the most widely used semiconductor switches like the insulated gate bipolar transistor (IGBT) and metal oxide semiconductor field effect transistor (MOSFET) are compared. Also using the sinusoidal pulse width modulation (SPWM) technique, improves the system efficiency considerably. Two SPWM-based singlephase inverters with the IGBT and MOSFET are designed and simulated in a MATLAB Simulink environment. The voltage drop and, thereby, the power loss across the switches are compared and analysed. The proposed technique shows that the SPWM inverter with the IGBT has lower power loss than the SPWM inverter with the MOSFET.

Źródło:

Archives of Electrical Engineering; 2022, 71, 3; 615--626
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Research on the operational performance of high speed permanent magnet generator with controlled rectifier in distributed generation

Autorzy:

Hongbo, Q.
Yanqi, W.
Cunxiang, Y.
Kaiqiang, H.

Powiązania:

https://bibliotekanauki.pl/articles/140696.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

high speed permanent magnet generator
controlled rectifier
electromagnetic field
switching frequency

Opis:

The uncontrolled rectifier and controlled rectifier which use fixed switching frequency control strategy are applied usually during the working of a high-power high- speed permanent magnet generator (HSPMG). Even for the controlled rectifier, it will generate harmonics. The electromagnetic performance of the HSPMG is also affected by these harmonics. In this paper, the influences of the fixed switching frequency control strategy on a HSPMG were studied. Based on the Fourier theory, the harmonic currents of the generator were analyzed, and the change of harmonic distribution range and current total harmonic distortion (THD) were obtained. By using an indirect field-circuit coupling method, the influences of the fixed switching frequency control strategy on the losses and torque of the generator were analyzed. The relations between the switching frequency and the losses and torque of the generator were obtained, and the change mechanism of the loss was revealed. The obtained conclusions can provide reference for the optimized choice of the switching frequency of the distributed generation system with the HSPMG. It can also provide support for the HSPMG electromagnetic structural optimization and the optimization of the loss and harmonic on the system level.

Źródło:

Archives of Electrical Engineering; 2018, 67, 4; 899-913
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Real-time implementation of an interconnected observer design for p-cells chopper

Autorzy:

Laidi, K.
Benmansour, K.
Ferdjouni, A.
Bouchhida, O.

Powiązania:

https://bibliotekanauki.pl/articles/141378.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

obserwator
switching modes
zasilanie
p-cell chopper
observer design
interconnected observer

Opis:

This paper deals with an observer design for a p-cell chopper. The goal is to reduce drastically the number of sensors in such system by using an observer in order to estimate all the capacitor voltages. Furthermore, considering an instantaneous model of a p-cell chopper, an interconnected observer is designed in order to estimate the capacitor voltages. This is realized by using only the load current measurement. Simulation results are given in order to illustrate the performance of such observer. To demonstrate the validity of our approach, experimental results based on Digital Signal Processor (DSP) are presented.

Źródło:

Archives of Electrical Engineering; 2010, 59, 1-2; 5-20
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Power-induced lasing state switching and bistability in a two-state quantum dot laser subject to optical injection

Autorzy:

Jiang, Zaifu
Wu, Zhengmao
Jayaprasath, Elumalai
Yang, Wenyan
Hu, Chunxia
Cui, Bing
Xia, Guangqiong

Powiązania:

https://bibliotekanauki.pl/articles/173329.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

two-state quantum dot laser
lasing state switching
bistability
optical injection

Opis:

We theoretically investigate power-induced lasing state switching and bistability in a two-state quantum dot laser subject to optical injection. The simulated results show that, for a free-running two-state quantum dot laser operating at the ground state under low current, a power-induced lasing state switching between the ground state and the excited state can be achieved through introducing optical injection with a frequency (w_inj) close to the lasing frequency of excited state (w_ES). The injection power required for the state switching depends on the scanning route of injection power, i.e. there may exist state bistability for the injection power within a certain region. For forward scanning injection power, with the increase of frequency detuning (ΔΩ = w_inj – w_ES), the injection power required for the state switching shows a decreasing trend accompanied by slight fluctuations. However, for backward scanning injection power, the injection power required for the state switching exhibits obvious fluctuations with the increase of ΔΩ. The width of the hysteresis loop fluctuates with ΔΩ, and the fluctuation amplitude is increased with the increase of the injection current. Additionally, the influences of the inhomogeneous broadening factor and the electron escape rate on the bistability performances are analyzed.

Źródło:

Optica Applicata; 2020, 50, 2; 257-269
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Formation control of underwater vehicles using Multi Agent System

Autorzy:

Das, Bikramaditya
Subudhi, Bidyadhar
Pati, Bibhuti Bhusan

Powiązania:

https://bibliotekanauki.pl/articles/229747.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

AUV
Multi Agent System
formation control
switching network topology
mild connectivity

Opis:

This paper proposes the development of a formation control algorithm of multiple acoustic underwater vehicles by employing the behaviour of autonomous mobile agents under a proposed pursuit. A robust pursuit is developed using the distributed consensus coordinated algorithm ensuring the transfer of information among the AUVs. The development of robust pursuit based on characteristics of multi-agent system is for solving the incomplete information capabilities in each agent such as asynchronous computation, decentralized data and no system global control. In unreliable and narrow banded underwater acoustic medium, the formation of AUVs based distributed coordinated consensus tracking can be accomplished under the constant or varying virtual leader’s velocity. Further, the study to achieve tracking based on virtual leader AUV’s velocity is extended to fixed and switching network topologies. Again for mild connectivity, an adjacency matrix is defined in such a way that an adaptive connectivity is ensured between the AUVs. The constant virtual leader vehicle velocity method based on consensus tracking is more robust to reduce inaccuracy because no accurate position and velocity measurements are required. Results were obtained using MATLAB and acquired outcomes are analysed for efficient formation control in presence of the underwater communication constraints.

Źródło:

Archives of Control Sciences; 2020, 30, 2; 365-384
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

The desctiption of turn-off process and evaluation of switching power losses in the ultra fast power MOSFET

Autorzy:

Grzejszczak, P.
Barlik, R.

Powiązania:

https://bibliotekanauki.pl/articles/1193214.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

power MOSFET
turn-off transient
parasitic capacitance
switching losses
thermovision measurement

Opis:

The article presents an analytical description of the turn-off process of the power MOSFET suitable for use in high-frequency converters. The purpose of this description is to explain the dynamic phenomena occurring inside the transistor and contributing to the switching power losses. The detailed description uses the results of simulation studies carried out using a very precise model of the CoolMOS transistor manufactured by Infineon (IPW60R070C6). The theoretical analysis has been verified in experimental measurements of power dissipated during turn-off transient of MOSFET operating in a full bridge converter with switching frequency of 100 kHz. To estimate these switching losses an original thermovision method based on the measurement of heat dissipated in the power semiconductor switches has been used. The obtained results confirm the correctness of the conclusions drawn from the theoretical analysis presented in this paper.

Źródło:

Power Electronics and Drives; 2016, 1, 36/1; 55-67
2451-0262
2543-4292

Pojawia się w:

Power Electronics and Drives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

A method of reducing switching losses in three-level NPC inverter

Autorzy:

Beniak, R.
Rogowski, K.

Powiązania:

https://bibliotekanauki.pl/articles/1193262.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

reduction of switching losses
three-level NPC inverter
space vector modulation

Opis:

The aim of the paper is to present a concept of implementation of a space vector modulation (SVM) algorithm, which is used to create alternating current waveforms of changing amplitude and frequency in power inverters. The main goal of the method is to decrease the number of state changes in power transistors. It is realized by utilizing a prediction algorithm and sequences of transistors, which are not common in use. The method requires measurement of inverter output current flow. The prediction algorithm analyzes possible sequences of transistors’ states and choose those which offers smaller switch count. A decrease of about 20% was obtained for the cases tested. This paper presents simulation result for selected driving scenario. The described method decreases the number of state changes in power transistors and therefore it is a potentially good method to considerably decrease energy losses of multilevel inverter-powered drive.

Źródło:

Power Electronics and Drives; 2016, 1, 36/2; 55-63
2451-0262
2543-4292

Pojawia się w:

Power Electronics and Drives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

On a general standby system and its optimization

Autorzy:

Cha, J. H.
Yun, W. Y.

Powiązania:

https://bibliotekanauki.pl/articles/2069693.pdf

Data publikacji:

2009

Wydawca:

Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności

Tematy:

warm standby
accelerated life testing
virtual age
switching time
mean lifetime

Opis:

Redundancy or standby is a technique that has been widely applied to improving system reliability and availability in the stage of system design. In this paper, we consider a standby system with two units in which the first unit (unit 1) starts its operation under active state and the other unit (unit 2) is under cold standby state at the starting point. After a specified time s (switching time), the state of unit 2 is changed to warm standby state and, as soon as the operating unit 1 fails, the state of unit 2 is changed to active state. If unit 1 fails before times, the system fails. Units can fail at both active and warm standby states. A general method for modeling the standby system is adopted and, based on it, system performance measures (system reliability and mean life) are derived. We consider the problem of determining optimal switching time which maximizes the expected system life. Some numerical examples are studied.

Źródło:

Journal of Polish Safety and Reliability Association; 2009, 1; 95--100
2084-5316

Pojawia się w:

Journal of Polish Safety and Reliability Association

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 83.

Tytuł:

On Some Properties of Instantaneous Active and Reactive Powers

Autorzy:

Czarnecki, L. S.

Powiązania:

https://bibliotekanauki.pl/articles/262612.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

active power filters
CPC theory
harmonics
non-sinusoidal systems
switching compensators

Opis:

Some features of the instantaneous active and reactive powers p and q , not reported earlier, are discussed in this paper. It is shown that oscillating components and of these powers may not depend on the order of the load current harmonic. It was shown, moreover, that a load supplied with a nonsinusoidal voltage may not be distinguished in terms of p and q powers from a harmonics generating load (HGL) supplied with a sinusoidal voltage. This observation is important for compensator control. Also it was shown that the instantaneous reactive power q cannot be interpreted as a measure of amount of energy exchanged between supply lines of a load or as amount of energy rotating around such lines, as it was suggested in some publications on the IRP p-q Theory. A phenomenon of energy rotation or exchange between lines does not exist.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2013, 16, 1; 11-17
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 84.

Tytuł:

Field Dependence, Efficiency of Information Processing in Working Memory and Susceptibility to Orientation Illusions among Architects

Autorzy:

Młyniec, Agnieszka
Bednarek, Hanna

Powiązania:

https://bibliotekanauki.pl/articles/430576.pdf

Data publikacji:

2016-04-01

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

working memory
weaker inhibition
task-switching
orientation illusions
field dependence
architects

Opis:

This study examined cognitive predictors of susceptibility to orientation illusions: Poggendorff, Ponzo, and Zöllner. It was assumed that lower efficiency of information processing in WM and higher field dependence are conducive to orientation illusions. 61 architects (30 women) aged M = 29, +/- 1.6, and 49 university students (29 women) aged M = 23.53, +/- 4.24, were tested with Witkin’s EFT to assess their field dependence; the SWATT method was used as a measure of WM efficiency, and susceptibility to visual illusions was verified with a series of computer tasks. We obtained a small range of the explained variance in the regression models including FDI and WM indicators. On the basis of WM efficiency indicators, we managed to confirm the existence of memory predictors of susceptibility to illusions (they are rather weak, as they explain from 6% to 14% of the variance of the dependent variable). Among the architects, lower efficiency of WM processing (weaker inhibition, task-switching) and higher field dependence are responsible for greater susceptibility to orientation illusions.

Źródło:

Polish Psychological Bulletin; 2016, 47, 1; 112-122
0079-2993

Pojawia się w:

Polish Psychological Bulletin

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Lqr-Based Nonlinear Tuning Relay Control Design With Fast Convergence

Autorzy:

Yu, X.
Xia, Y.
Ledwich, G.
Oghanna, W.

Powiązania:

https://bibliotekanauki.pl/articles/908299.pdf

Data publikacji:

1999

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

sterowanie rozdzielcze
sterowanie przekaźnikowe
switching control
LQR
relay control
sliding mode

Opis:

In this article, we present a relay control scheme based on LQR design with fast convergence. This scheme provides a practical and simple way to achieve fast convergence based on the well-known LQR design principle. The controller is a global stabiliser in the sense that for any given initial condition, we can always initialize the controller to drive the system to reach the origin. This controller is tunable in accordance with the position of the system state: the closer to the origin, the larger the control gains, which results in a fast control that maintains bounded control magnitude. It has also been shown that setting matrix Q can significantly influence the tendency of eigenvalues to switch the hyperplane. The relation between matrix Q and the tendency of those eigenvalues has been identified. Simulation results are presented to demonstrate the effectiveness of the scheme.

Źródło:

International Journal of Applied Mathematics and Computer Science; 1999, 9, 2; 313-326
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 86.

Tytuł:

Calendar Anomalies, Market Regimes, and the Adaptive Market Hypothesis in African Stock Markets

Autorzy:

A. Obalade, Adefemi
Muzindutsi, Paul-Francois

Powiązania:

https://bibliotekanauki.pl/articles/1810536.pdf

Data publikacji:

2020-01-30

Wydawca:

Akademia Leona Koźmińskiego w Warszawie

Tematy:

calendar effect
intra-month
AMH; African stock markets
Markov switching model

Opis:

Findings: We found that (i) all the markets except for the Johannesburg Stock Exchange (JSE) have a higher tendency to be in bearish state than bullish state, (ii) month-of-the-year and intra-month effects appear in one regime and disappear in another regime, and (iii) the behavior of calendar Methodology: We applied two-stage Markov switching models (MSMs) instead of the conventional single state regression model. The sample period includes the daily index return of Nigerian, South African, Mauritian, Moroccan, and Tunisian stock exchanges from January 1998 to February 2018. Purpose: This paper examines the changing behavior of two calendar anomalies in African stock returns – the month-of-the-year and the intra-month effects – and their implications for the adaptive market hypothesis (AMH). anomalies is affected by market conditions and conforms to AMH rather than the efficient market hypothesis (EMH). Practical Implications: We present that (i) calendar anomaly is a characteristic that changes under different regimes or market conditions in African stock markets, (ii) active investment management may yield profits for market participants, depending on the market conditions and the anomaly in question, and (iii) the right approach would be for investors to consider each market with its own peculiarity even when they are in the same continent. Originality/Value: The sensitivity of the month-of-the-year and the intra-month effects to market conditions has not been documented in African stock markets, especially with the use of regime-switching models.

Źródło:

Central European Management Journal; 2019, 27(4); 71-94
2658-0845
2658-2430

Pojawia się w:

Central European Management Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

Price patterns in an oligopoly with switching cost and uncertain demand

Autorzy:

Zawisza, M.
Kamiński, B.

Powiązania:

https://bibliotekanauki.pl/articles/406324.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

price competition
switching cost
agent-based modeling
uncertain demand
price volatility

Opis:

Characteristics of price patterns have been investigated in an oligopoly market with costs for switching a provider. Two regimes of a company’s access to information have been considered. In the benchmark scenario, firms make decisions based on perfect information about demand. In the other – more realistic scenario – they conduct market research to estimate an unknown demand curve and therefore face uncertainty regarding their profit function, which in turn leads to suboptimal decision making. The authors inspected how a company’s access to information on demand, costs for switching a provider and the rate of market renewal influence price patterns on the market. It has been shown that positive switching cost is a sufficient condition for price dispersion, as well as imperfect information about the company's profit function, e.g. from market research. The average price under the perfect information regime is lower than under market research based price setting, a higher switching cost makes it easier for companies to coordinate their prices and a higher rate of market renewal softens the influence of the switching cost on market price.

Źródło:

Operations Research and Decisions; 2013, 23, 3; 71-89
2081-8858
2391-6060

Pojawia się w:

Operations Research and Decisions

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Switching Volatility in Emerging Stock Markets and Financial Liberalization: Evidence from the new EU Member Countries

Autorzy:

Kouretas, Georgios
Syllignakis, Manolis

Powiązania:

https://bibliotekanauki.pl/articles/483237.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

emerging European stock markets
stock return volatility
Markov switching
financial crises

Opis:

In this paper, we use weekly stock market data to examine whether the volatility of stock returns of ten emerging capital markets of the new EU member countries has changed since the opening of their capital markets. In particular we are interested in understanding whether there are high and low periods of stock returns volatility and what the degree of correlation across these markets is. We estimate a Markov-Switching ARCH (SWARCH) model proposed by Hamilton and Susmel (1994) and we allow for the possibility that two or three volatility regimes may exist for stock returns volatility. The main finding of the present study is that the high volatility of stock returns of all new EU emerging stock markets is associated mainly with the 1997-1998 Asian and Russian financial crises as well as over the 2007-2009 financial turmoil, while there is a transition to the low volatility regime as they approach the accession to the EU in 2004. It is also shown that the capital flows liberalization process has resulted in an increase in volatility of stock returns in most cases.

Źródło:

Central European Journal of Economic Modelling and Econometrics; 2012, 4, 2; 65-93
2080-0886
2080-119X

Pojawia się w:

Central European Journal of Economic Modelling and Econometrics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Markov Switching In-Mean Effect. Bayesian Analysis in Stochastic Volatility Framework

Autorzy:

Kwiatkowski, Łukasz

Powiązania:

https://bibliotekanauki.pl/articles/483277.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Markov switching
stochastic volatility
risk premium
in-mean effect
Bayesian analysis

Opis:

In the study we introduce an extension to a stochastic volatility in mean model (SV-M), allowing for discrete regime switches in the risk premium parameter. The logic behind the idea is that neglecting a possibly regimechanging nature of the relation between the current volatility (conditional standard deviation) and asset return within an ordinary SV-M specification may lead to spurious insignificance of the risk premium parameter (as being 'averaged out' over the regimes). Therefore, we allow the volatility in-mean effect to switch over different regimes according to a discrete homogeneous twostate Markov chain. We treat the new specification within the Bayesian framework, which allows to fully account for the uncertainty of model parameters, latent conditional variances and hidden Markov chain state variables. Standard Markov Chain Monte Carlo methods, including the Gibbs sampler and the Metropolis-Hastings algorithm, are adapted to estimate the model and to obtain predictive densities of selected quantities. Presented methodology is applied to analyse series of the Warsaw Stock Exchange index (WIG) and its sectoral subindices. Although rare, once spotted the switching inmean effect substantially enhances the model fit to the data, as measured by the value of the marginal data density.

Źródło:

Central European Journal of Economic Modelling and Econometrics; 2010, 2, 1; 59-94
2080-0886
2080-119X

Pojawia się w:

Central European Journal of Economic Modelling and Econometrics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

Influence of the Greek Crisis on the Risk Perception of European Economies

Autorzy:

Kliber, Agata

Powiązania:

https://bibliotekanauki.pl/articles/483351.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

CDS
bond spread
Markov-switching models
GARCH models
volatility
financial crisis

Opis:

In the article the author analyses the impact of the Financial Crisis, especially the Greek fiscal one, on the sCDS prices in Europe. The aim of the article is to assess the ability of the sCDS premia to price the risk of countries before and during the Greek crisis. The author analyses sCDS premia of maturity 10 years together with the so called bond-spreads, i.e. the spreads between the countries’ bond indexes and the risk free rate of the region (in our case it was the yield of German bonds of corresponding maturity - 10 years). The idea was to check whether there occurred any discrepancies in the risk valuation via the two measures, as a consequence of the Greek crisis. The data is taken daily and covers the period of 2008-2012. Based upon the results obtained in the research we conclude that the Greek crisis indeed influenced the relationships between the two measures of risk, however the degree of the influence was different in different countries. The relationships between the two measures of risk were totally broken only in the case of Greece, while in the other countries the relationships either were not distorted or had been broken already at the beginning of the financial crisis (2008/2009). The Greek problems were indeed reflected in volatilities of all analysed instruments; however triggering the credit event affected only Greek bonds dynamics.

Źródło:

Central European Journal of Economic Modelling and Econometrics; 2013, 5, 2; 125-161
2080-0886
2080-119X

Pojawia się w:

Central European Journal of Economic Modelling and Econometrics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Forecasting the Polish Zloty with Non-Linear Models

Autorzy:

Rubaszek, Michał
Skrzypczyński, Paweł
Koloch, Grzegorz

Powiązania:

https://bibliotekanauki.pl/articles/483367.pdf

Data publikacji:

2010-11-03

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

exchange rate forecasting
Polish zloty
Markov-switching models
artificial neural networks

Opis:

The literature on exchange rate forecasting is vast. Many researchers have tested whether implications of theoretical economic models or the use of advanced econometric techniques can help explain future movements in exchange rates. The results of the empirical studies for major world currencies show that forecasts from a naive random walk tend to be comparable or even better than forecasts from more sophisticated models. In the case of the Polish zloty, the discussion in the literature on exchange rate forecasting is scarce. This article fills this gap by testing whether non-linear time series models are able to generate forecasts for the nominal exchange rate of the Polish zloty that are more accurate than forecasts from a random walk. Our results confirm the main findings from the literature, namely that it is dificult to outperform a naive random walk in exchange rate forecasting contest.

Źródło:

Central European Journal of Economic Modelling and Econometrics; 2010, 2, 2; 151-167
2080-0886
2080-119X

Pojawia się w:

Central European Journal of Economic Modelling and Econometrics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

Bayesian Analysis of a Regime Switching In-Mean Effect for the Polish Stock Market

Autorzy:

Kwiatkowski, Łukasz

Powiązania:

https://bibliotekanauki.pl/articles/483371.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Markov switching
stochastic volatility
risk premium
in-mean effect
Bayesian analysis

Opis:

The study aims at a statistical verification of breaks in the risk-return relationship for shares of individual companies quoted at the Warsaw Stock Exchange. To this end a stochastic volatility model incorporating Markov switching in-mean effect (SV-MS-M) is employed. We argue that neglecting possible regime changes in the relation between expected return and volatility within an ordinary SV-M specification may lead to spurious insignificance of the risk premium parameter (as being 'averaged out' over the regimes). Therefore, we allow the volatility-in-mean effect to switch over different regimes according to a discrete homogeneous two- or three-state Markov chain. The model is handled within Bayesian framework, which allows to fully account for the uncertainty of model parameters, latent conditional variances and state variables. MCMC methods, including the Gibbs sampler, Metropolis-Hastings algorithm and the forward-filtering-backward-sampling scheme are suitably adopted to obtain posterior densities of interest as well as marginal data density. The latter allows for a formal model comparison in terms of the in-sample fit and, thereby, inference on the 'adequate' number of the risk premium regimes.

Źródło:

Central European Journal of Economic Modelling and Econometrics; 2011, 3, 4; 187-219
2080-0886
2080-119X

Pojawia się w:

Central European Journal of Economic Modelling and Econometrics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 93.

Tytuł:

On the Usefulness of Financial Variables Realised Volatility for Recession Forecasting and Business Cycles Turning Points Dating

Autorzy:

Łupińśki, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/500632.pdf

Data publikacji:

2013-09-01

Wydawca:

Szkoła Główna Handlowa w Warszawie

Tematy:

realised volatility
Markov switching model
dynamic factor model
turning points detection

Opis:

The main goal of this paper was to check usefulness of introducing measures of the financial markets risk into multivariate forecasting and business cycle dating models to improve their predictive and turning points detection power. Realised volatility was selected as market risk synthetic measure and introduced into two recession dating algorithms: Harding & Pagan (2002) mechanical procedure and Markov Switching Dynamic Factor Model (MS-DFM) with mixed frequencies and missing data handling. In the theoretical part of the article mathematical background of the realised volatility concept and MS-DFM model were presented. It was also described how the output of the MS-DFM model can be used to date turning points. This approach to local maxima detection was compared with Harding and Pagan competitor algorithm. In the practical part of the paper recession detection improvements stemming from introduction of realised volatility measures into MS-DFM model/Harding & Pagan procedure were examined for US and four Western Europe countries (Germany, France, United Kingdom and Italy) in the time span of 20 years between 1990 and 2010.

Źródło:

Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2013, 93: Expectations and Forecasting; 29-44
0866-9503

Pojawia się w:

Prace i Materiały Instytutu Rozwoju Gospodarczego SGH

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

A Pedagogical Evaluation of Intra-Sentential Code-Switching Patterns in L2 Classroom Talk

Autorzy:

Majer, Jan

Powiązania:

https://bibliotekanauki.pl/articles/620629.pdf

Data publikacji:

2009-01-01

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

intra-sentential code-switching
language alternation
code-mixing
borrowing
transfer
classroom discourse

Opis:

The paper is concerned with teachers' and students' alternation between L1 and L2 within the same utterance, i.e. uses of intra-sentential code-switching which in classroom discourse tends to be less accepted by modern language pedagogy than its inter-sentential counterpart. The rationale for the study is the universal nature of the phenomenon known to occur in the first place in interactions among natural bilinguals and multilinguals. The data analysis sections of the article review eight different patterns which are evaluated pedagogically. It transpires that the category most likely to arouse methodological controversy is code-mixing.

Źródło:

Research in Language; 2009, 7; 31-41
1731-7533

Pojawia się w:

Research in Language

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 95.

Tytuł:

Analysis of operation of class E ZVS resonant inverter

Autorzy:

Szychta, E.

Powiązania:

https://bibliotekanauki.pl/articles/262645.pdf

Data publikacji:

2005

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Tematy:

class E ZVS resonant
inverter
output capacitance
MOSFET transistor
zero voltage switching

Opis:

The article discusses class E zero-voltage-switching resonant inverter (ZVS). The resonant circuit of the inverter is subject to mathematical analysis using the method of state variables with the aid of MATLAB software. Results of simulation testing, based on Simplorer software, of an inverter at the operating frequency of 100kHz are presented.

Źródło:

Electrical Power Quality and Utilisation. Journal; 2005, 11, 1; 57-67
1896-4672

Pojawia się w:

Electrical Power Quality and Utilisation. Journal

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 96.

Tytuł:

Matlab application for study the distorted load current influence on low voltage circuit breakers breaking capacity
Zastosowanie oprogramowania Matlab do analizy wpływu zniekształcenia prądu wyłączanego na zdolności łączeniowe wyłącznika niskiego napięcia

Autorzy:

Smugala, D.
Bonk, M.
Ziemski, R.

Powiązania:

https://bibliotekanauki.pl/articles/266339.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Elektrotechniki i Automatyki

Tematy:

current harmonics
switching parameters
arcing time
harmoniczne prądu
parametry łączeniowe
czas łukowy

Opis:

Matlab engineering software application for measurement results’ analysis process improvement has been presented in this paper. The main purpose of the study was the analysis of the impact of the interrupted current distortion level on selected low voltage (LV) circuit-breakers’ (CB) current breaking capability. Influence of various levels and characters of current distortion were analyzed for few types of LV circuit-breakers. Huge number of data collected as the result of performed tests needed process automatization for fast extraction the specific resultant data required for future analysis. It was realized by means of developed Matlab software script. Developed script, basis on recorded diagrams, permitted for fast determination the arcing time, arc energy and power for various voltage levels and interrupted current phase and values.
W artykule przedstawiono zastosowanie oprogramowania inżynierskiego Matlab do usprawnienia analizy wyników pomiarów uzyskanych drogą eksperymentu. Implementacja opracowanego skryptu pozwoliła na automatyzacje procesu ekstrakcji wybranych danych bezpośrednio z zarejestrowanych drogą pomiarów przebiegów napięć i prądów. Głównym celem przeprowadzonych badań była analiza wpływu formy oraz poziomu odkształcenia wyłączanego prądu na podstawowe zdolności łączeniowe wybranych łączników niskiego napięcia. Z uwagi na obszerną bazę uzyskanych wyników pomiarów, a tym samym dużą liczbę danych koniecznych do przeprowadzenia analizy, zastosowano specjalnie w tym celu opracowany skrypt dedykowany dla środowiska Matlab, a pozwalający na automatyzacje wspomnianego procesu, w szczególności na wyodrębnienie z pozyskanych przebiegów napięć i prądów, niezbędnych do dalszej analizy informacji. Dzięki opracowanemu oprogramowaniu możliwe stało się szybkie pozyskanie danych dotyczących czasów łukowych, energii i mocy łuku dla różnych parametrów sieci oraz różnych chwil czasowych rozejścia się styków.

Źródło:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 57; 117-120
1425-5766
2353-1290

Pojawia się w:

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 97.

Tytuł:

Arc to Glow Transition for Using DC Low Power Switches in Low Voltage Electric Grids

Autorzy:

Wisniewski, G.

Powiązania:

https://bibliotekanauki.pl/articles/1202499.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

switching arc DC
low voltage
low power installation
arc-to-glow transition

Opis:

This paper presents and discusses results of analysis and investigations of arc to glow transformation phenomenon at contact opening, under DC inductive loads of low power (≤10 J) and low voltage (≤250 V). The proportion in duration of arcing and glowing is investigated in dependence on current and voltage value, contact material properties. The transition phenomenon is analyzed by means of fast photography and emission spectroscopy to complete the study. On the basis of investigated results the conclusions about the possibility of control of the arc to glow transformation for practical use in DC low voltage and low power electrical grids are formulated.

Źródło:

Present Problems of Power System Control; 2017, 8; 31-40
2084-2201

Pojawia się w:

Present Problems of Power System Control

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Variational formalism applied to control of autonomous switching systems

Autorzy:

Bagdouri, M. E.
Cebron, B.
Sechilariu, M.
Burger, J.

Powiązania:

https://bibliotekanauki.pl/articles/970461.pdf

Data publikacji:

2004

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

teoria sterowania
system komutacyjny
rachunek wariacyjny
control theory
switching systems
variational calculation

Opis:

The formalism of the calculus of variations is applied to determine an optimal control of a class of Hybrid Dynamical Systems. This class consists of autonomous switching systems where jumps of the state are taken into account. It is shown that model switching involves discontinuities in the adjoint state of the system. The expression of the gradient of the cost function, with respect to the control, allows for the calculation of an optimal control by implementing a descent method. Au illustrative linear quadratic example is given, which allows to conclude that, the method can be easily implemented.

Źródło:

Control and Cybernetics; 2004, 33, 4; 535-549
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Kształtowanie koncentracji, empatii, odwagi i odpowiedzialności przez zajęcia plenerowe z czasowym wyłączaniem percepcji wzrokowej

Autorzy:

Sadowski, Michał

Powiązania:

https://bibliotekanauki.pl/articles/2007476.pdf

Data publikacji:

2016-12-31

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

Switching off visual perception
concentration
empathy
responsibility
blind person
guide
education
upbringing

Opis:

The ability to focus, empathy, courage and responsibility are important determinants affecting the development of pro-social behavior. In the modern education system, they are rarely appreciated. They are being pushed away, often far from pragmatism and academic knowledge. In the same time the modern world needs a person able to see deeper and more thorough, that is able to discover what seems to be hidden from the sight of others. The aim of this study was to verify the usefulness of field activities in the development of selected social attitudes. The participants moved around with their eyes closed assisted by their colleagues. The study was conducted during the obligatory winter camps of the Faculty of Tourism and Recreation in the Academy of Physical Education in Warsaw in 2014–2016. 86 students were tested, amongst them there were 37 women and 49 men. The experimental group consisted of people carrying out their snowboard training and experiencing temporary shutdown of visual perception during the activity. The results were compared with tests carried out on the third and fourth stage of education. The basic research method was a pedagogical experiment, that involved participant observation tool. To collect more detailed data a diagnostic survey was also used. The study used collecting material techniques – a survey, a complementary interview and a video recording the behavior of respondents during the activities. People with experience in practicing snowboarding with eyes closed (experimental group) did much better in difficult terrain showing lower level of feelings of anxiety and greater courage, composure and accuracy in performing given tasks. Respondents playing the guide role presented rarely seen in everyday situations empathetic attitude in response to their colleagues stress reactions. The results allow to draw conclusion that the use of similar activities at different levels of education can be an effective tool in building positives interpersonal relationships in educational institutions and beyond. Studies show that getting such effects as increased levels of concentration, accuracy in action, coping with stress – which connects to more effectively undertaken in difficult conditions – can be possible only through systematic training using a temporary shutdown of visual perception.

Źródło:

Krakowskie Studia Małopolskie; 2016, 21; 215-232
1643-6911

Pojawia się w:

Krakowskie Studia Małopolskie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Robot Local Network Using TQS Protocol for Land-to-Underwater Communications

Autorzy:

Irawan, Addie
Abas, Mohammad Fadhil
Hasan, Nurulfadzilah

Powiązania:

https://bibliotekanauki.pl/articles/307970.pdf

Data publikacji:

2019

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

class of service
land-to-underwater communications
robot local network
tag switching

Opis:

This paper presents a model and an analysis of the Tag QoS switching (TQS) protocol proposed for heterogeneous robots operating in different environments. Collaborative control is topic that is widely discussed in multirobot task allocation (MRTA) – an area which includes establishing network communication between each of the connected robots. Therefore, this research focuses on classifying, prioritizing and analyzing performance of the robot local network (RLN) model which comprises a point-to-point topology network between robot peers (nodes) in the air, on land, and under water. The proposed TQS protocol was inspired by multiprotocol label switching (MPLS), achieving a quality of service (QoS) where swapping and labeling operations involving the data packet header were applied. The OMNET++ discrete event simulator was used to analyze the percentage of losses, average access delay, and throughput of the transmitted data in different classes of service (CoS), in a line of transmission between underwater and land environments. The results show that inferior data transmission performance has the lowest priority with low bitrates and extremely high data packet loss rates when the network traffic was busy. On the other hand, simulation results for the highest CoS data forwarding show that its performance was not affected by different data transmission rates characterizing different mediums and environments.

Źródło:

Journal of Telecommunications and Information Technology; 2019, 1; 23-30
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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