Skocz do pozycji: 1.

Tytuł:

Ocena funkcjonalności wybranych witryn internetowych promujących działalność agroturystyczną w woj. podlaskim
The evaluation of functionality of selected websites promoting agrituorism in podlaskie district

Autorzy:

Stepaniuk, K.

Powiązania:

https://bibliotekanauki.pl/articles/399344.pdf

Data publikacji:

2009

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

agroturystyka
witryny internetowe
Agritourism farms website function analysis

Opis:

The article contains the analysis of functions of tourism websites in podlaskie district. 129 Internet websites of agritourism farms, nationwide tourist portals and Internet website catalogues were examined. Most of them revealed information, marketing and contact functions (e.g. email enquiry). The on-line booking (booking function) and tourism website registration (user personalization function) were slightly represented. None of the analyzed websites allows a user to make an on-line payment for tourist products and services.

Źródło:

Ekonomia i Zarządzanie; 2009, 1, 1; 128-132
2080-9646

Pojawia się w:

Ekonomia i Zarządzanie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Flexible lighting distribution on “party ships”

Autorzy:

Mayer, O.

Powiązania:

https://bibliotekanauki.pl/articles/134922.pdf

Data publikacji:

2017

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

TRIZ
TIPS
trimming
function analysis
FOS
trends
IFR
resources

Opis:

TRIZ trends predict an increased electrification of engineering systems. One of the visible effects of this is lighting, in this case party lights on boats. The need to furnish a boat with colorful illumination requires a flexible, redispatchable system. Cable-bound illumination does not meet this requirement. A solution is presented in this paper using TRIZ as a problem-solving methodology. TRIZ comprises a set of heuristic tools for problem analysis, reformulation, root cause analysis, and problem-solving algorithms. TRIZ, however, concentrates on generating solutions to problems irrespective of given limitations concerning, for example, safety, producibility, or cost. TRIZ provides a direction of thinking that has been proven successful in the past for similar problems. Other tools must, nevertheless, be used to carry out a technical evaluation of the feasibility of the solution, scalability, practicability, or cost target. TRIZ tools are widely used by engineers in multinational corporations such as Intel, GE, Philips, Siemens, Bosch, Boeing, Samsung, LG, and Cochlear. In this paper, selected tools from the overall TRIZ toolbox will be used and explained, with a focus on functional analysis, trimming, and resources. However, other aspects (Trends, Function Oriented Search (FOS), and Ideal Final Result (IFR)) will also be presented.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 9-16
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Mutational analysis of the AtNUDT7 Nudix hydrolase from Arabidopsis thaliana reveals residues required for protein quarternary structure formation and activity

Autorzy:

Olejnik, Kamil
Płochocka, Danuta
Grynberg, Marcin
Goch, Grażyna
Gruszecki, Wiesław
Basińska, Teresa
Kraszewska, Elżbieta

Powiązania:

https://bibliotekanauki.pl/articles/1040587.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

dimer
Nudix
structure-function analysis
mutagenesis
AtNUDT7
Arabidopsis thaliana
14.3.3 interaction
biophysical analysis

Opis:

Arabidopsis thaliana AtNUDT7, a homodimeric Nudix hydrolase active on ADP-ribose and NADH, exerts negative control on the major signaling complex involved in plant defense activation and programmed cell death. The structural and functional consequences of altering several amino-acid residues of the AtNUDT7 protein have been examined by site-directed mutagenesis, far-UV circular dichroism (CD), attenuated total reflection-Fourier transform infrared (ATR-FTIR) and photon correlation (PCS) spectroscopy, biochemical analysis and protein-protein interaction studies. Alanine substitutions of F73 and V168 disallowed dimer formation. Both the F73A- and V168A-mutated proteins displayed no observable enzymatic activity. Alanine substitution of the V69 residue did not significantly alter the enzyme activity and had no influence on dimer arrangement. The non-conserved V26 residue, used as a negative control, did not contribute to the enzyme quaternary structure or activity. Detailed biophysical characterization of the wild-type and mutant proteins indicates that the mutations do not considerably alter the secondary structure of the enzyme but they affect dimer assembly. In addition, mutating residues V69, F73 and V168 disrupted the binding of AtNUDT7 to the regulatory 14.3.3 protein. These are the first studies of the structure-function relationship of AtNUDT7, a Nudix hydrolase of important regulatory function.

Źródło:

Acta Biochimica Polonica; 2009, 56, 2; 291-300
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

The Predictors of the Consequences of Secondary Exposure to Trauma Among Professionals Working With Trauma Victims

Autorzy:

Juczyński, Zygfryd
Ogińska-Bulik, Nina

Powiązania:

https://bibliotekanauki.pl/articles/31343460.pdf

Data publikacji:

2023

Wydawca:

Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL

Tematy:

secondary traumatic stress
secondary posttraumatic growth
core beliefs
cognitive processing of trauma
discriminant function analysis

Opis:

Helping those who have experienced trauma exposes the helpers to secondary traumatization. The mechanisms of its development are most often explained using the cognitive model of trauma processing. The aim of the research is to determine how disturbances of core beliefs and cognitive processing in the form of coping with stress are associated with secondary traumatic stress (STS) and secondary posttraumatic growth (SPTG). The study was conducted among psychologists and social workers (N = 240), working with people after traumatic experiences. Four standardized measurement tools were used. Based on the differential diagnosis, four types of consequences were identified. Discriminant analysis was used to establish the optimal configuration of predictors explaining the differences between the four subgroups. Two significant discriminant functions were significant, each identifies different beliefs and coping strategies. The first is associated with the disruptions of core beliefs about the world and cognitive processing in the form of a non-adaptive strategy; the second—with disturbed beliefs about oneself and adaptation strategies. Our results show a much greater exposure of social workers to the negative consequences of secondary traumatic stress disorder. A system of constant monitoring should be introduced, and the principles of prevention and therapy should be implemented.

Źródło:

Roczniki Psychologiczne; 2023, 26, 3; 241-260
1507-7888

Pojawia się w:

Roczniki Psychologiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Proba klasyfikacji odmianowej miodow pszczelich metoda analizy funkcji dyskryminacyjnej

Autorzy:

Popek, S

Powiązania:

https://bibliotekanauki.pl/articles/828392.pdf

Data publikacji:

2002

Wydawca:

Polskie Towarzystwo Technologów Żywności

Tematy:

analiza funkcji dyskryminacyjnej
analiza zywnosci
klasyfikacja odmian
miod pszczeli
wlasciwosci fizykochemiczne
jakosc
discriminant function analysis
food analysis
cultivar classification
bee honey
physicochemical property
quality

Opis:

Celem niniejszej pracy było opracowanie nowej metody identyfikacji typów i odmian miodu pszczelego, na podstawie fizykochemicznych parametrów determinujących ich jakość. Przeprowadzona analiza dyskryminacyjna pozwoliła, na podstawie zaproponowanego modelu uwzględniającego pomiar przewodności elektrycznej właściwej, lepkości dynamicznej oraz kwasowości ogólnej badanych próbek miodów, na identyfikacją poszczególnych typów i odmian. Model ten poddano weryfikacji, w odniesieniu do dodatkowych próbek miodu, która dowiodła jego poprawności.
The aim of the research was to develop a new procedure to identify a honey type using the discriminant analysis. The physico-chemical parameters of quality of honeys were determined in 73 honey samples. Using only three parameters: total ash content, total acidity and dynamic viscosity a nearly correct classification was achieved with the helping proposed model. Correctness model was verified for 28 other samples of honey..

Źródło:

Żywność Nauka Technologia Jakość; 2002, 09, 2; 78-87
1425-6959

Pojawia się w:

Żywność Nauka Technologia Jakość

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Polszczyzna we francuskich listach królowej Marysieńki – charakterystyka funkcjonalna i genologiczna

Autorzy:

Zarębski, Rafał

Powiązania:

https://bibliotekanauki.pl/articles/29520151.pdf

Data publikacji:

2022-12-20

Wydawca:

Uniwersytet Bielsko-Bialski

Tematy:

French-Polish bilingualism
letter
Maria Kazimiera d’Arquien Sobieska
function and genre analysis
17th century

Opis:

The Polish language in the French letters of Queen Marysieńka – function and genre analysis The article presents a function and genre analysis of the use of Polish words (transcoded markers) in the French letters of Queen Marysieńka Sobieska to her husbands: Jan Sobiepan Zamoyski and King Jan III Sobieski. The functional characterization distinguishes an emotive function (based on the strategy of including emotionally and stylistically charged elements in L2 = the second language), e.g. świnia (pig), a referential function (based on the strategy of including names of realities belonging to the space of L2), e.g. pospolite ruszenie (mass levy), and a deictic function (based on the inclusion of proper names functioning primarily in L2), e.g. Jaworów. In reference to the genre analysis, the role of personal and factual factors, which imply the use of L2 in the letters of bilingual people, is observed, as well as the place of elements from L2 in the structure of letters. It is concluded that the presence of elements in L2 does not affect the cohesion of the letters, but broadens their potential and proves the author’s full competence in both languages.

Źródło:

Świat i Słowo; 2022, 39, 2; 155-170
1731-3317

Pojawia się w:

Świat i Słowo

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Wybór metod szacowania kosztów modyfikacji na wstępnych etapach cyklu życia oprogramowania ERP

Autorzy:

Plecka, P.
Bzdyra, K.

Powiązania:

https://bibliotekanauki.pl/articles/118394.pdf

Data publikacji:

2013

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

ERP
projekt informatyczny
szacowanie kosztów
analiza punktów funkcyjnych
wdrożenia systemów informatycznych
IT project
cost valuation
function points analysis
IT systems implementations

Opis:

W pracy poruszono problem doboru metod szacowania kosztów modyfikacji systemu ERP podczas wdrożenia. Przeprowadzono przegląd dostępnych metod opisanych w literaturze oraz scharakteryzowano etapy fazy strategicznej procesu wdrożenia. Na podstawie analizy zakresu danych wymaganych przez poszczególne metody oraz danych uzyskiwanych na różnych etapach, zaproponowano algorytmy doboru metod do tychże etapów.
The work discusses the problem of selecting methods for valuing the costs of modifying ERP systems during implementation process. The methods presented in literature have been reviewed and the stages of strategic phase of implementation have been characterised. On the basis of the analysis of data required by each method and the data obtained at different stages, algorithms of method selection for each stage ware proposed.

Źródło:

Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej; 2013, 5; 127-142
1897-7421

Pojawia się w:

Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Estimation of technical efficiency by application of the SFA method for panel data

Autorzy:

Bezat, A.

Powiązania:

https://bibliotekanauki.pl/articles/573024.pdf

Data publikacji:

2011

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

efficiency
stochastic frontier analysis
Cobb-Douglas function
translog function
analysis method
business firm
technical efficiency
frontier production function

Opis:

Estimation of the technical efficiency which measures the ability of a company to obtain the maximum output from given inputs or to use the minimum input to achieve given outputs has been considered. Stochastic methods were chosen because of their wide application in research in the whole world. The Translog and Cobb-Douglas stochastic frontiers were fitted in order to estimate the efficiency of milling companies in Poland.

Źródło:

Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2011, 11(26), 3
2081-6960

Pojawia się w:

Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

On the robustness of optimal solutions for combinatorial optimization problems

Autorzy:

Libura, M.

Powiązania:

https://bibliotekanauki.pl/articles/969645.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

robustness analysis
sensitivity analysis
combinatorial optimization
accuracy function
robustness radius

Opis:

We consider the so-called generic combinatorial optimization problem, where the set of feasible solutions is some family of subsets of a finite ground set with specified positive initial weights of elements, and the objective function represents the total weight of elements of a feasible solution. We assume that the weights of all elements may be perturbed simultaneously and independently up to a given percentage of their initial values. A feasible solution which minimizes the worst-case relative regret, is called a robust solution. The maximum percentage level of perturbations, for which an initially optimal solution remains robust, is called the robustness radius of this solution. In this paper we study the robustness aspect of initially optimal solutions and provide lower bounds for their robustness radii.

Źródło:

Control and Cybernetics; 2009, 38, 3; 671-685
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

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: 11.

Tytuł:

The hazard function and its role in a non-parametric duration analysis of enterprises in the Łódzkie Voivodeship

Autorzy:

Mikulec, Artur

Powiązania:

https://bibliotekanauki.pl/articles/424857.pdf

Data publikacji:

2019

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

enterprises
duration analysis
hazard function
cumulative hazard function
mean absolute percentage error

Opis:

In a duration analysis of enterprises, as a rule there are determined four basic functions related to the time of their duration, i.e.: the density function; the distribution function; the survival function, and the hazard function. It turns out that the hazard function and its cumulative version are the key to understanding modern survival analysis. The aim of the paper is to indicate the best method of the estimation of the values of individual functions in survival analysis based on other functions. The paper provides compiled and classified information on particular functions used in the non-parametric duration analysis of enterprises. It examines some theoretical and practical problems related to the determination of, among others, the hazard function and the cumulative hazard function on the basis of data in cohort tables and the results of the estimation of the survival function with the use of the Kaplan- Meier method. The considerations included in the paper are illustrated with the results of analyses for enterprises established in the Łódzkie Voivodeship in 2001-2015 (including those which went into liquidation).

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2019, 23, 3; 59-75
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

The Second Wave of the COVID-19 Pandemic in Poland - Characterised Using FDA Methods
Druga fala COVID-19 w Polsce - charakterystyka z zastosowaniem metod FDA

Autorzy:

Hęćka, Patrycja

Powiązania:

https://bibliotekanauki.pl/articles/21375673.pdf

Data publikacji:

2023

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

function-on-function regression
functional data analysis (FDA)
COVID-19
functional principal component analysis
smooth functions
regresja function-on-function
analiza danych funkcjonalnych
analiza głównych składowych funkcjonalnych
funkcje gładkie

Opis:

The aim of this article was to analyse functional data of the number of hospitalised individuals, intensive care patients, positive COVID-19 tests, deaths and convalescents during the second wave of the COVID-19 pandemic in Poland. For this purpose, firstly the author convert data of sixteen voivodeships to smooth functions, and then used the principal component analysis and multiple function-on-function linear regression model to predict the number of hospitalised and intensive care patients due to the COVID-19 infection during the second wave of the pandemic. Finally, the results were compared with those previously obtained for the combined data of the second and third wave of the COVID-19 pandemic in Poland (Hęćka, 2023).
Głównym celem artykułu była analiza danych funkcjonalnych dotyczących liczby pozytywnych wyników testu, zgonów, ozdrowieńców, osób hospitalizowanych oraz w stanie ciężkim podczas drugiej fali pandemii COVID-19 w Polsce. Pierwszym krokiem była konwersja danych w funkcje gładkie. Następnie przedstawiono analizę głównych składowych funkcjonalnych oraz użycie modelu multiple function-on-function linear regression w celu predykcji liczby osób hospitalizowanych oraz będących w stanie ciężkim z powodu COVID-19 w polskich województwach. Otrzymane wyniki porównano z wcześniej uzyskanymi dla połączonych danych z drugiej i trzeciej fali pandemii.

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2023, 27, 3; 20-34
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Bifurcation and Stability Analysis of the Dynamics of Gonorrhea Disease in the Population

Autorzy:

Adediipo, Adeola D.
Akanni, John O.
Shangodare, Olasunkanmi M.

Powiązania:

https://bibliotekanauki.pl/articles/1030149.pdf

Data publikacji:

2020

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Basic Reproduction Number
Bifurcation analysis
Gonorrhea disease
Lyapunov function
Sensitivity analysis
Stability Analysis

Opis:

The model was governed by a system of ordinary differential equations; the population into susceptible individuals (S), Exposed individuals (E), infected individuals (I) and Recovered individuals (Q). Theory of positivity and boundedness was used to investigate the well-posedness of the model. Equilibrium solutions were investigated analytically. The basic reproduction number (R0) were calculated using the next generation operator method. Bifurcation analysis and global stability of the model were carried out using centre manifold theory and Lyapunov functions respectively. The effects of parameters such as efficacy of Condom (κ), Effective Contact Rate (β), Compliance of Condom (θ), Progression Rate (ρ) and Treatment Rate (α) on R0 were explored through sensitivity analysis. The possibility of mitigating the spread of gonorrhea in the population has been studied. It can be concluded that parameters representing efficacy of Condom, Effective Contact Rate, Compliance of Condom, Progression Rate and Treatment Rate are significant in reducing the burden of gonorrhea disease in the population.

Źródło:

World Scientific News; 2020, 143; 139-154
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Supporting decisions on the Forex market using fuzzy approach

Autorzy:

Juszczuk, Przemysław
Kruś, Lech

Powiązania:

https://bibliotekanauki.pl/articles/384399.pdf

Data publikacji:

2020

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

trading system
Forex
fuzzy membership function
multicriteria analysis

Opis:

A new concept of the multicriteria fuzzy trading system using the technical analysis is proposed. The existing trading systems use different indicators of the technical analysis and generate buy or sell signal only when assumed conditions for a given indicator are satisfied. The information presented to the trader – decision maker is binary. The decision maker obtains a signal or no. In comparison to the existing traditional systems called as crisp, the proposed system treats all considered indicators jointly using the multicriteria approach and the binary information is extended with the use of the fuzzy approach. Currency pairs are considered as variants in the multicriteria space in which criteria refer to different technical indicators. The introduced domination relation allows generating the most efficient, non‐dominated (Pareto optimal) variants in the space. An algorithm generated these non-dominated variants is proposed. It is implemented in a computer‐based system assuring the sovereignty of the decision maker. We compare the proposed system with the traditional crisp trading system. It is made experimentally on different sets of real‐world data for three different types of trading: short‐term, medium and long‐term trading. The achieved results show the computational efficiency of the proposed system. The proposed approach is more robust and flexible than the traditional crisp approach. The set of variants derived for the decision maker in the case of the proposed approach includes only non‐dominated variants, what is not possible in the case of the traditional crisp approach. The reservation point and its impact on the overall results are measured with the use of the sensitivity analysis.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 2; 50-62
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: 15.

Tytuł:

Zastosowanie funkcji przynależności w analizie subiektywnego postrzegania jakości życia
Application of membership function in the analysis of subjective perception of quality of life

Autorzy:

Dudek, Hanna
Szczesny, Wiesław

Powiązania:

https://bibliotekanauki.pl/articles/425020.pdf

Data publikacji:

2015

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

membership function
quality of life
multidimensional data analysis

Opis:

In this paper a multivariate analysis of the subjective perception of quality of life is undertaken. In the analysis methods of a fuzzy set theory are applied. The study is conducted on data from the Social Diagnosis 2013. It includes 16 items relating to the evaluation of satisfaction with particular aspects of life. Each of these items is measured on a 7-grade scale. The item’s categories are converted into a [0, 1] interval by using a membership function. In order to aggregate items into synthetic indicators various systems of weights are used. It is found that the choice of weights does not significantly affect the distribution of synthetic indicators. In the next stage, the subjective perception of the quality of life in different socio- -demographic groups is analyzed. It is found that such characteristics as gender, place of residence, size of household, education level and age are important determinants of subjective perception of quality of life.

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2015, 4 (50); 62-78
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Reliability analysis method of coupling optimal importance sampling density and multi-fidelity Kriging model

Autorzy:

Xie, Jiayu
Tian, Zongrui
Zhi, Pengpeng
Zhao, Yadong

Powiązania:

https://bibliotekanauki.pl/articles/24200829.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

reliability analysis
multifidelity model
learning function
stopping condition

Opis:

The commonly used reliability analysis approaches for Kriging-based models are usually conducted based on high-fidelity Kriging models. However, high-fidelity surrogate models are commonly costly. Therefore, in order to balance the calculation expense and calculation time of the surrogate model, this paper proposes a multi-fidelity Kriging model reliability analysis approach with coupled optimal important sampling density (OISD+MFK). First, the MEI learning function is proposed considering the training sample distance, model computation cost, expected improvement function, and model relevance. Second, a dynamic stopping condition is proposed that takes into account the failure probability estimation error. Finally, the optimal importance sampling density is incorporated into the reliability analysis process, which can effectively reduce failure probability estimation error. The results of the study show that the approach proposed in this paper can reduce the calculation cost while outputting relatively accurate failure probability evaluation results.

Źródło:

Eksploatacja i Niezawodność; 2023, 25, 2; art. no. 161893
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Experimental modal analysis in research

Autorzy:

Żółtowski, M.
Napieraj, K.

Powiązania:

https://bibliotekanauki.pl/articles/390979.pdf

Data publikacji:

2017

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

experimental modal analysis
FRF function
vibration modes
testing

Opis:

Experimental modal analysis has grown steadily in popularity since the advent of the digital FFT spectrum analyser in the 1970’s. This days impact testing has become widespread as a fast and economical means of finding the vibration modes of a machine or structure. Its significantly use ascending roles can be seen also in the civil engineering industry [6]. This paper reviews the main topics associated with experimental modal analysis including making FRF measurements, modal excitation techniques, and modal parameter estimation from a set of FRFs.

Źródło:

Budownictwo i Architektura; 2017, 16, 3; 5-12
1899-0665

Pojawia się w:

Budownictwo i Architektura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Trajectory tracking and collision avoidance for the formation of two-wheeled mobile robots

Autorzy:

Kowalczyk, W.
Kozłowski, K.

Powiązania:

https://bibliotekanauki.pl/articles/200897.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

robot formation
nonholonomic robot
stability analysis
Lyapunov-like function
path following
artificial potential function

Opis:

This paper presents control method for multiple two-wheeled mobile robots moving in formation. Trajectory tracking algorithm from [7] is extended by collision avoidance, and is applied to the different type of formation task: each robot in the formation mimics motion of the virtual leader with a certain displacement. Each robot avoids collisions with other robots and circular shaped, static obstacles existing in the environment. Artificial potential functions are used to generate repulsive component of the control. Stability analysis of the closed-loop system is based on Lyapunov-like function. Effectiveness of the proposed algorithm is illustrated by simulation results.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 915-924
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: 19.

Tytuł:

Stability analysis of engineering/physical dynamic systems using residual energy function

Autorzy:

Civelek, C.

Powiązania:

https://bibliotekanauki.pl/articles/229956.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

stability analysis
residual energy function as Lyapunov function
physical dynamic systems
coupled engineering systems

Opis:

In this article, an engineering/physical dynamic system including losses is analyzed inrelation to the stability from an engineer’s/physicist’s point of view. Firstly, conditions for a Hamiltonian to be an energy function, time independent or not, is explained herein. To analyze stability of engineering system, Lyapunov-like energy function, called residual energy function is used. The residual function may contain, apart from external energies, negative losses as well. This function includes the sum of potential and kinetic energies, which are special forms and ready-made (weak) Lyapunov functions, and loss of energies (positive and/or negative) of a system described in different forms using tensorial variables. As the Lypunov function, residual energy function is defined as Hamiltonian energy function plus loss of energies and then associated weak and strong stability are proved through the first time-derivative of residual energy function. It is demonstrated how the stability analysis can be performed using the residual energy functions in different formulations and in generalized motion space when available. This novel approach is applied to RLC circuit, AC equivalent circuit of Gunn diode oscillator for autonomous, and a coupled (electromechanical) example for nonautonomous case. In the nonautonomous case, the stability criteria can not be proven for one type of formulation, however, it can be proven in the other type formulation.

Źródło:

Archives of Control Sciences; 2018, 28, 2; 201-222
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Outlier detection based on the functional coefficient of variation

Autorzy:

Deveci Kocakoç, Ipek
Köymen Keser, Istem

Powiązania:

https://bibliotekanauki.pl/articles/12289238.pdf

Data publikacji:

2023-03-15

Wydawca:

Główny Urząd Statystyczny

Tematy:

coefficient of variation function
outlier detection
functional data analysis

Opis:

The coefficient of the variation function is a useful descriptive statistic, especially when comparing the variability of more than two curve groups, even when they have significantly different mean curves. Since the coefficient of variation function is the ratio of the mean and standard deviation functions, its particular property is that it shows the acceleration more explicitly than the standard deviation function. The aim of the study is twofold: to show that the functional coefficient of variation is more sensitive to abrupt changes than the functional standard deviation and to propose the utilisation of the functional coefficient of variation as an outlier detection tool. Several simulation trials have shown that the coefficient of the variation function allows the effects of outliers to be seen explicitly.

Źródło:

Statistics in Transition new series; 2023, 24, 2; 1-16
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Stability analysis of the model describing the fractional composition of coal
Analiz ustojjchivosti modeli opisanija frakcionnogo sostava ugla

Autorzy:

Grachyov, O.

Powiązania:

https://bibliotekanauki.pl/articles/793116.pdf

Data publikacji:

2013

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

fractional composition
coal
distribution function
stability analysis
numerical experiment

Źródło:

Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 3
1641-7739

Pojawia się w:

Teka Komisji Motoryzacji i Energetyki Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Modal analysis quality identification methodology applied to wall-elements
Metoda identyfikacji jakości elementów ściennych z zastosowaniem analizy modalnej

Autorzy:

Zoltowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2084054.pdf

Data publikacji:

2021

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

coherence function
experimental modal analysis
stabilization diagram
wall element

Opis:

New recommendations and norms in civil engineering show a need to control the quality of wall elements; the quality control demands guidelines to fit requirements of mass-production of wall elements. This article develops an approach which applies advanced calculating techniques used for wall-structural analysis. The paper proposes a diagnostic methodology which can be added to regulations and standards based on experimental modal analysis methodology.

Źródło:

Acta Scientiarum Polonorum. Architectura; 2021, 20, 3; 39-44
1644-0633

Pojawia się w:

Acta Scientiarum Polonorum. Architectura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Hazards and their reduction in urea production for synthesis reactor by Mitsui - Toatsu technology

Autorzy:

Wyciszkiewicz, A.
Golacki, K.
Samociuk, W.

Powiązania:

https://bibliotekanauki.pl/articles/30147311.pdf

Data publikacji:

2018

Wydawca:

Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki

Tematy:

HAZOP hazard analysis
contingency scenarios
safety function
urea synthesis

Opis:

Industrial large-scale urea production creates a number of hazards due to equipment and machine failures as well as service errors. Failures can cause material, environmental and human losses. The work presents the assessment of safety hazards and failure effects for selected emergency scenarios of Mitsui - Toatsu's urea synthesis reactor. A fragment of the process implemented in the synthesis node was covered by HAZOP (Hazard and Operability Study), and the critical points, from the security point of view, were identified. Several emergency scenarios for various types of failures and various effects are presented. The analyzed contingency scenarios include: blocking the valve on the outflow from the reactor and leaks caused by corrosion resulting from the maintenance of improper technological parameters of the process. The work suggested the need for new security measures and modernization of the installation by using the safety function for the selected critical point. The hazards analyzed and the contingency scenarios developed are essential for risk assessment and its possible reduction.

Źródło:

Scientific Journal of the Military University of Land Forces; 2018, 50, 1(187); 150-164
2544-7122
2545-0719

Pojawia się w:

Scientific Journal of the Military University of Land Forces

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Wavelength-sensitive-function-based spectral reconstruction using segmented principal component analysis

Autorzy:

Wu, G.
Shen, X.
Liu, Z.
Zhang, J.

Powiązania:

https://bibliotekanauki.pl/articles/174199.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

spectral reconstruction
wavelength-sensitive function
segmented principal component analysis

Opis:

Spectral images provide richer information than colorimetric images. A high-dimensional spectral data presents a challenge for efficient spectral reconstruction. In conventional reconstruction methods it is very difficult to obtain good spectral and colorimetric accuracy simultaneously. In this paper, a segmented principal component analysis (SPCA) method and a weighted segmented principal component analysis (wSPCA) method are proposed for efficient reconstruction of spectral color information. The methods require, firstly, partitioning the complete spectrum of wavelengths into two subgroups, considering the sensitivity of human visual system. Then the classical principal component analysis (PCA) carried out each subgroup of data separately. The results indicated that the spectral and colorimetric accuracy of the SPCA and wSPCA outperformed the PCA and weighted PCA, and wSPCA clearly retained more color visual information.

Źródło:

Optica Applicata; 2016, 46, 3; 365-374
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

New property of quaternionic Fueter functions

Autorzy:

Królikowski, W.

Powiązania:

https://bibliotekanauki.pl/articles/122882.pdf

Data publikacji:

2013

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

quaternionic analysis
regular function in the sense of Fueter

Opis:

We present the result of the theory of quaternionic Fueter regular functions. It is shown that the module of such function ||F(q)||, q := w+ix+jy+kz, cannot be an analytic function in r; r2 := ||q||2 := w2 + x2 + y2 + z2.

Źródło:

Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 2; 29-37
2299-9965

Pojawia się w:

Journal of Applied Mathematics and Computational Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Quaternionic regular functions in the sense of Fueter and fundamental 2-forms on a 4-dimensional almost Kähler manifold

Autorzy:

Królikowski, W.

Powiązania:

https://bibliotekanauki.pl/articles/122554.pdf

Data publikacji:

2013

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

fundamental 2-form
almost Kahler manifold
complex analysis
Fueter regular function
quaternionic analysis

Opis:

A correspondence between quaternionic regular functions in the sense of Fueter and fundamental 2-forms on a 4-dimensional almost Kahler manifold is shown.

Źródło:

Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 1; 77-83
2299-9965

Pojawia się w:

Journal of Applied Mathematics and Computational Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Quality of solutions for perturbed combinatorial optimization problems

Autorzy:

Libura, M.

Powiązania:

https://bibliotekanauki.pl/articles/205967.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

kombinatoryka
optymalizacja
teoria zbioru
accuracy function
accuracy radius
combinatorial optimization
sensitivity analysis
stability function
stability radius

Opis:

We consider a general combinatorial optimization problem in which the set of feasible solutions is defined as a given and fixed family of subsets for some finite ground set. To any element of the ground set the so-called weight is associated. The problem consists in finding a feasible subset for which the sum of weights of its elements is the minimum. When the weights of elements vary or are estimated with some accuracy, then the solution of the problem obtained for some initial weights may appear non-optimal. In this paper we consider the quality of a given solution in the case of weights perturbation or inaccuracy. Namely, we study the relative error of a given solution as a function of particular weights perturbation. We also calculate the maximum perturbation or estimation errors of weights which preserve the optimality of a given solution of the problem.

Źródło:

Control and Cybernetics; 2000, 29, 1; 199-219
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

The digital function filters – algorithms and applications

Autorzy:

Siwczyński, M.
Drwal, A.
Żaba, S.

Powiązania:

https://bibliotekanauki.pl/articles/199949.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

digital function filters
digital irrational filters
analysis and synthesis irrational filters
recursive algorithms of function filters

Opis:

The simple digital filters are not sufficient for digital modeling of systems with distributed parameters. It is necessary to apply more complex digital filters. In this work, a set of filters, called the digital function filters, is proposed. It consists of digital filters, which are obtained from causal and stable filters through some function transformation. In this paper, for several basic functions: exponential, logarithm, square root and the real power of input filter, the recursive algorithms of the digital function filters have been determined The digital function filters of exponential type can be obtained from direct recursive formulas. Whereas, the other function filters, such as the logarithm, the square root and the real power, require using the implicit recursive formulas. Some applications of the digital function filters for the analysis and synthesis of systems with lumped and distributed parameters (a long line, phase shifters, infinite ladder circuits) are given as well.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 371-377
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: 29.

Tytuł:

Face Recognition Using Canonical Correlation, Discrimination Power, and Fractional Multiple Exemplar Discriminant Analyses

Autorzy:

Hajiarbabi, M.
Agah, A.

Powiązania:

https://bibliotekanauki.pl/articles/384779.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

face recognition
Canonical Correlation Analysis
Discrimination Power Analysis
Multiple Exemplar Discriminant Analysis
Radial Basis Function neural
networks

Opis:

Face recognition is a biometric identification method which compared to other methods, such as finger print identification, speech, signature, hand written and iris recognition is shown to be more noteworthy both theoretically and practically. Biometric identification methods have various applications such as in film processing, control access networks, among many. The automatic recognition of a human face has become an important problem in pattern recognition, due to (1) the structural similarity of human faces, and (2) great impact of factors such as illumination conditions, facial expression and face orientation. These have made face recognition one of the most challenging problems in pattern recognition. Appearance-based methods are one of the most common methods in face recognition, which can be categorized into linear and nonlinear methods. In this paper face recognition using Canonical Correlation Analysis is introduced, along with the review of the linear and nonlinear appearance-based methods. Canonical Correla- tion Analysis finds the linear combinations between two sets of variables which have maximum correlation with one another. Discriminant Power analysis and Fractional Multiple Discriminant Analysis has been used to extract features from the image. The results provided in this paper show the advantage of this method compared to other methods in this field.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2015, 9, 4; 18-27
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: 30.

Tytuł:

Masso-stoimostnye zavisimosti prostranstvennykh indukcionnykh preobrazovatelejj s aksialnym shtampopressovannym i vitym magnitoprovodami
Mass value on the spatial induction converter with axially stamp-pressed and twisted magnetic circuits

Autorzy:

Sadovoy, A.

Powiązania:

https://bibliotekanauki.pl/articles/77944.pdf

Data publikacji:

2015

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

target function
electromagnetic processe
material consumption
harmonic analysis
calculation model

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 2
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Bayesian Estimation of Capital Stock and Depreciation in the Production Function Framework

Autorzy:

Boratyński, Jakub
Osiewalski, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/2075283.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

productive capital stock
depreciation rate
aggregate production function
Bayesian analysis

Opis:

We propose a Bayesian approach to estimating productive capital stocks and depreciation rates within the production function framework, using annual data on output, employment and investment only. Productive capital stock is a concept related to the input of capital services to production, in contrast to the more common net capital stock estimates, representing market value of fixed assets. We formulate a full Bayesian model and employ it in a series of illustrative empirical examples. We find that parameters of our model, from which the time-path of capital is derived, are weakly identified with the data at hand. Nevertheless, estimation is feasible with the use of prior information on the production function parameters and the characteristics of productivity growth. We show how precision of the estimates can be improved by augmenting the model with an equation for the rate of return

Źródło:

Central European Journal of Economic Modelling and Econometrics; 2021, 4; 455-486
2080-0886
2080-119X

Pojawia się w:

Central European Journal of Economic Modelling and Econometrics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

The Application of UTA Method for Support Evaluation Negotiation Offers

Autorzy:

Roszkowska, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/429422.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku

Tematy:

UTA method
holistic judgments
support negotiation
preference analysis
scoring function

Opis:

The MCDA technique has been extensively and successfully applied for supporting decision making in negotiation processes. The mostly used techniques SAW, AHP or TOPSIS are based on direct preference information which requires from negotiator a clear and precise definition all the parameters of the preference model (e.g. issue weights, option rates, aspiration and reservation values etc.), so those techniques can be successfully applied in well-structured negotiation problems. But, many real negotiation problems are illstructured, that means that the negotiation space is imprecisely defined, and the negotiator’s preferences the vagueness or imperfect. The main purpose of this paper is to investigate the potentials and the applicability the UTA method, one of the techniques based on indirect preference information, in evaluation of negotiation offers, especially in ill-structured negotiation problems. The UTA (Jacquet-Lagreze and Siskos, 1978, 1982, 2001) is a multicriteria decision making method which is based on the linear programming model for inferring additive utility functions from a set of representative decision data. The example is also presented to elaborate and demonstrate the holistic judgment and the usefulness UTA approach for evaluation negotiation offers.

Źródło:

Optimum. Economic Studies; 2016, 2(80)
1506-7637

Pojawia się w:

Optimum. Economic Studies

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Static analysis of function calls in Erlang. Refining the static function call graph with dynamic call information by using data-flow analysis

Autorzy:

Horpácsi, D.
Koszegi, J.

Powiązania:

https://bibliotekanauki.pl/articles/384069.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

static function call graph
dynamic call information
flow analysis
language Erlang

Opis:

Functions and their relations can affect numerous properties and metrics of a functional program. To identify and represent the functions and their calling connections, software analysers commonly apply semantic function analysis, which derives the static call graph of the program, based on its source code. Function calls however may be dynamic and complex, making it difficult to statically identify the callee. Dynamic calls are determined just at run-time, static analysis therefore cannot be expected to fully identify every call. Nevertheless, by utilising the results of a properly performed data-flow analysis as well as taking ambiguous references into account, numerous dynamic calls are discoverable and representable. We consider cases where the identifiers of the callee are statically determined, but they flow into the call expression from a different program point, and also, we manage to handle function calls whose identifiers are not fully identifiable at compile-time. By utilizing the improved reference analysis, we extend the static call graph with various information about dynamic function calls. We investigate such a function call analysis in the programming language Erlang.

Źródło:

e-Informatica Software Engineering Journal; 2013, 7, 1; 65-76
1897-7979

Pojawia się w:

e-Informatica Software Engineering Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

An adaptive PC-Kriging method for time-variant structural reliability analysis

Autorzy:

Nan, Hang
Li, Hongshuang
Song, Zhuocheng

Powiązania:

https://bibliotekanauki.pl/articles/2172036.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

time-variant
reliability analysis
instantaneous response
adaptive PC-Kriging
learning
function

Opis:

The practical application of time-variant reliability analysis is limited by its computationally expensive models which describe the structural system behavior. This paper presents a new adaptive PC-Kriging (APCK) approach to accurately and efficiently assess the time-variant reliabilities. Time interval is firstly discretized with a series of time instants and then the stochastic process is reconstructed by standard normal random variables and deterministic function of time. PC-Kriging (PCK) models are built at each time instant to predict the instantaneous responses of performance function. To improve the accuracy and efficiency, a new update strategy based on the integration of U- and H- learning functions is developed to refine the PCK models of instantaneous responses. One or two best samples are identified by the proposed learning criterion for updating the PCK models. Finally, Monte Carlo simulation (MCS) is used to estimate the time-variant reliability based on the updated PCK models. Four examples are used to validate the accuracy and efficiency of the proposed method.

Źródło:

Eksploatacja i Niezawodność; 2022, 24, 3; 532--543
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Endotoxin exposure and changes in short-term pulmonary function among sewage workers

Autorzy:

Cyprowski, Marcin
Sobala, Wojciech
Buczyńska, Alina
Szadkowska-Stańczyk, Irena

Powiązania:

https://bibliotekanauki.pl/articles/2177186.pdf

Data publikacji:

2015-06-25

Wydawca:

Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi

Tematy:

sewage workers
endotoxin exposure
inhalable dust
smoking
lung function
regression analysis

Opis:

Objectives The inhaled endotoxin is considered as a causative factor in the process of acute bronchial obstruction, which can be measured by a decrease in forced expiratory volume in 1 s (FEV₁). The aim of this study was to assess endotoxin exposure among sewage treatment plant workers (STPW) and its effect on across-shift changes in respiratory airflow. Material and Methods A group of 78 STPW from a large sewage treatment plant was studied. Inhalable dust for endotoxin assessment was collected using personal aerosol samplers. Endotoxin was assayed with the kinetic, chromogenic Limulus amebocyte lysate test. Across-shift spirometric measurements were performed on Mondays, after 2-days absence from work, with the use of portable spirometer. The forced vital capacity (FVC), and FEV₁ parameters were analyzed. Multifactor regression modeling was performed to determine parameters significantly associated with endotoxin exposure. Results The concentration of inhalable dust and endotoxin ranged from 0.01–1.38 mg/m³ and 0.68–214 endotoxin units per cubic meter of air (EU/m³), respectively. Endotoxins were characterized with the skewed distribution (arithmetic mean (AM) = 38.8 EU/m³, geometric mean (GM) = 15.4 EU/m³, geometric standard deviation (GSD) = 4.21). Through the use of multifactor analysis, which excluded the main confounders (inhalable dust and smoking habit) it was found that, despite low levels of endotoxin, it had significant impact on the observed across-shift decline in FEV₁ (p = 0.044). For this parameter, the regression slope was additionally calculated (r = –0.017, p = 0.071). Conclusions Relatively low levels of endotoxin among sewage treatment plant workers may cause small, but significant across-shift declines in FEV₁. The observed relationship was independent of organic dust concentrations and smoking habit. The respiratory protection should be provided for STPW.

Źródło:

International Journal of Occupational Medicine and Environmental Health; 2015, 28, 5; 803-811
1232-1087
1896-494X

Pojawia się w:

International Journal of Occupational Medicine and Environmental Health

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

The Macbeth Approach for Evaluation Offers in Ill–Structure Negotiations Problems

Autorzy:

Roszkowska, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/430033.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku

Tematy:

MACBETH
M-MACBETH
qualitative judgments
support negotiation
preference analysis
scoring function

Opis:

This paper described the main idea of the MACBETH approach and M-MACBETH software to multicriteria negotiation analysis. The MACBETH is based on the additive value model and requires only qualitative judgments about differences of attractiveness to help a decision maker quantify the relative value of options or criteria. The main goal of this procedure is to support interactive learning about evaluation problems and to provide the recommendations to select and rankordering options/criteria in decision making processes. We proposed to use MACBETH methodology as well M-MACBETH software to support ill-structure negotiation problems, i e. evaluation of negotiation offers in an environment with uncertain, subjective and imprecise information and not precisely defined decision makers preferences. An numerical example showing how M-MACBETH software can be implemented in practice, in order to help a negotiator to define numerical values of options/criteria based on verbal statements and next build a scoring system negotiation offers taking into account different types of issues in negotiation problems is presented. More detail we describe the main key points of M-MACBETH software related to structuring the negotiation model, building value scales for evaluation negotiation packages, weighting negotiation issues and selected elements of sensitivity analyzes.

Źródło:

Optimum. Economic Studies; 2014, 5(71)
1506-7637

Pojawia się w:

Optimum. Economic Studies

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

A new software tool for transient thermal analysis based on fast IR camera temperature measurement

Autorzy:

Chatzipanagiotou, P.
Strąkowska, M.
De Mey, G.
Chatziathanasiou, V.
Więcek, B.
Kopeć, M.

Powiązania:

https://bibliotekanauki.pl/articles/114612.pdf

Data publikacji:

2017

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

transient thermal analysis
IR thermography
Nyquist plot
time constants
cumulative structure function

Opis:

A new software tool for transient thermal analysis based on thermographic measurement of temperature is presented. In the proposed approach, temperature change after applying or removing power can be measured by a thermal camera or any contact temperature sensor. The software calculates thermal impedance in frequency domain and represents it in the form of the Nyquist plot. In addition, thermal time constant spectrum and cumulative structure function are evaluated. The software was developed in Matlab environment using in-built procedures for transfer function estimation. For the validation of the proposed tool, the results are compared with ones obtained using commercially available software.

Źródło:

Measurement Automation Monitoring; 2017, 63, 2; 48-51
2450-2855

Pojawia się w:

Measurement Automation Monitoring

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Compactly supported multi-wavelets

Autorzy:

Banaś, W.

Powiązania:

https://bibliotekanauki.pl/articles/255374.pdf

Data publikacji:

2012

Wydawca:

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

Tematy:

compactly supported multi-wavelet
compactly supported scaling function
multiresolution analysis
expansive matrix

Opis:

In this paper we show some construction of compactly supported multi-wavelets In L2(Rd), d ≥ 2 which is based on the one-dimensional case, when d = 1. We also demonstrate that some methods, which are useful in the construction of wavelets with a compact support at d = 1, can be adapted to higher-dimensional cases if A ∈Mdxd(Z) is an expansive matrix of a special form.

Źródło:

Opuscula Mathematica; 2012, 32, 1; 21-29
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Quantile analysis of the operating costs of the public transport fleet

Autorzy:

Andrzejczak, K.
Selech, J.

Powiązania:

https://bibliotekanauki.pl/articles/374621.pdf

Data publikacji:

2017

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

cost analysis
public transport
quantile function
analiza kosztów
transport publiczny
funkcja kwantylowa

Opis:

The aim of this paper is to develop a quantile method of cost analysis allowing identification of the most cost-generating malfunctions occurring in a fleet of public transport vehicles. The exemplification of this method has been performed for a fleet of a specified type of trams. The idea behind the quantile method of public transport vehicle operating cost analysis is the reversing of the accumulated function of costs, for the determination of which a cost database from a given operating time of a public transport vehicle fleet has been used. The paper presents data on the malfunctions from the first five years of operation of trams in a large transport company. The assumed time of five years results from the warranty period provided by the manufacturer. The recorded number of indexes of replaced parts was 547. The group contained inoperative parts that were renewed several times.

Źródło:

Transport Problems; 2017, 12, 3; 103-111
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Statistical Analysis of Indoor RSSI Read-outs for 433 MHz, 868 MHz, 2.4 GHz and 5 GHz ISM Bands

Autorzy:

Chruszczyk, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/226569.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

indoor location
RSSI measurement
RSSI statistical analysis
ISM band
probability density function

Opis:

This paper presents statistical analysis of RSSI readouts recorded in indoor environment. Many papers concerning indoor location, based on RSSI measurement, assume its normal probability density function (PDF). This is partially excused by relation to PDF of radio-receiver's noise and/or together with influence of AWGN (average white Gaussian noise) radio-channel – generally modelled by normal PDF. Unfortunately, commercial (usually unknown) methods of RSSI calculations, typically as "side-effect" function of receiver's AGC (automatic gain control), results in PDF being far different from Gaussian PDF. This paper presents results of RSSI measurements in selected ISM bands: 433/868 MHz and 2.4/5 GHz. The measurements have been recorded using low-cost integrated RF modules (at 433/868 MHz and 2.4 GHz) and 802.11 WLAN access points (at 2.4/5 GHz). Then estimated PDF of collected data is shown and compared to normal (Gaussian) PDF.

Źródło:

International Journal of Electronics and Telecommunications; 2017, 63, 1; 33-38
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Application of database technology to analysis of rock structure images

Autorzy:

Mlynarczuk, M.
Ladniak, M.
Piorkowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/110666.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

image processing
mathematical morphology
quantitative analysis of rocks
databases
user defined function

Opis:

The aim of this paper is to present a possibility to use information technology in the form of databases for processing and analyzing large image sets based on methods of image analysis and mathematical morphology. Up to now the use of databases in the image analysis process has been reduced to storing large amounts of data in the form of images. However, all transformations and analyses of such sets are made on user’s computers. This requires a large data set (images) to be sent by network each time, and also it may possess the problems resulting from managing such large amounts of analyzed photographs on a computer. The proposed approach completely eliminates these problems by moving all transformations of image analysis to a database platform. For this purpose a set of routines realizing transformations of the image analysis and mathematical morphology was developed. The proposed approach allows the unification of the image processing and analysis area and advanced statistical analyses of obtained parameters describing geometrical sizes of objects on photographs. The proposed methodology was illustrated by practical realization of two measurement types for a simple structure of copper concentrate and more complicated, from the point of view of image analysis, structures such as dolomites from Redziny and Laskowa Gora and sandstones from Tumlin and Wisniowka.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 2; 563-573
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Separacja składowych widmowych w zadaniu identyfikacji modelu nieliniowego
Separation of spectra components in identyfication task of nonlinear model

Autorzy:

Dziurdź, J.

Powiązania:

https://bibliotekanauki.pl/articles/328666.pdf

Data publikacji:

2004

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

analiza sygnałów
funkcja koherencji
separacja sygnałów
signal analysis
coherence function
signal separation

Opis:

W zastosowaniach technicznych zużycie maszyny często objawia się wzrostem nieliniowości obserwowanych drgań mechanicznych (hałasu). Ponieważ efekty te przejawiają się występowa-niem w widmie ciągów poliharmonicznych o stosunkowo niskich amplitudach łatwo jest o po-myłki w interpretacji obrazów widmowych. Opracowanie przedstawia propoz.ycję metody zwięk-szenia rozdzielczości analizy widmowej przy użyciu funkcji koherencji.
In many technical application during wear process of machine some nonlinear effects of vibra-tions (and noise) increase. Because this effects are usually long poliharmonic series, it is generally difficult to separate different symptoms. The paper includes a proposal of algorithm (using the co-herence function) increasing resolution of spectrum analysis to the value smaller than it is possible to achieve using Fourier transform, when the sample of satisfying duration is not possible to get.

Źródło:

Diagnostyka; 2004, 30, T. 1; 162-166
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Estymacja efektywności technicznej: Podejście kombinowane
Estimation of technical efficiency: a combined approach

Autorzy:

Błażejczyk-Majka, Lucyna
Kala, Radosław

Powiązania:

https://bibliotekanauki.pl/articles/452782.pdf

Data publikacji:

2011

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

DEA
analiza regresji
COLS
MOLS
graniczna funkcja produkcji
regression analysis
frontier production function

Opis:

W pracy zaproponowano modyfikację metody łączącej podejście nieparametryczne z parametrycznym dla estymacji efektywności technicznej. W przeciwieństwie do oryginalnej metody kombinowanej oraz dwóch metod opartych wyłącznie na analizie regresji metoda proponowana wykorzystuje własność niezmienniczości charakteryzującą podejście nieparametryczne DEA realizowane przy założeniu maksymalizacji wyniku produkcyjnego i zmiennego zwrotu ze skali. Rozważania zilustrowano wykorzystując dane o produkcji rolniczej przeciętnych, w skali regionów Unii Europejskiej, gospodarstw prowadzących uprawy polowe. Uzyskane oceny efektywności potwierdzają, że metoda proponowana dostarcza ocen efektywności, które są najbardziej skorelowane z ocenami wyznaczanymi metodą nieparametryczną, a równocześnie są bardziej zróżnicowane, co przemawia na jej korzyść.
In the paper a modification of the method linking nonparametric and parametric approaches for estimation of the technical effectiveness, was presented. In contrast with the original combined method and with two methods based only on the regression analysis, the proposed method is exploiting the property of invariance which is characteristic for nonparametric DEA under assumption of output maximization and variable returns to scale. Investigations were illustrated using data, at the regional level, in reference to regions represented by field crop farms. The estimates of efficiencies obtained by the proposed method appear to be the most correlated with that following from DEA, and at the same time they are more diversified.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2011, 12, 2; 80-90
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

O badaniach nad kształtowaniem się u studentów matematyki podstawowych pojęć analizy matematycznej
On the research on developing the basic concepts of mathematical analysis in Mathematics students

Autorzy:

Powązka, Zbigniew

Powiązania:

https://bibliotekanauki.pl/articles/1789390.pdf

Data publikacji:

2017-07-06

Wydawca:

Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie

Tematy:

process of forming the concepts of mathematical analysis
measure
integral
absolute value function

Opis:

This paper is a reflection on the process of forming the basic concepts of mathematical analysis in students. These studies were conducted in the years 2002-2011 and they coincided with the period of major educational reforms in our country. These reforms had an impact on the level of Mathematics teaching in various schools and on anticipatory preparing of young people to study this subject. Thus, this work is an attempt to summarize the results of the already described various stages of the research. The first part contains the answer to the question about the role of the content of this subject in the mathematical preparation of future teachers of Mathematics. In next parts, examples of introducing selected concepts of mathematical analysis are presented and thereafter conclusions from the carried-out research are formulated.

Źródło:

Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia; 2013, 5; 105-119
2080-9751
2450-341X

Pojawia się w:

Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Performance analysis of two-stage network processes with feedback flows and undesirable factors

Autorzy:

Nematizadeh, Maryam
Amirteimoori, Alireza
Kordrostami, Sohrab

Powiązania:

https://bibliotekanauki.pl/articles/406474.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

data envelopment analysis
weak disposability
directional distance function
undesirable output
two-stage
feedback

Opis:

Network data envelopment analysis (NDEA) is a non-parametric technique to evaluate the relative efficiency of decision-making units (DMUs) with network structures. An interesting and important network structure is a two-stage feedback process in which the outputs of the second stage are used as the inputs for the first stage. The existing approach did not consider undesirable products and from experience though we know that in real applications, network structures may consist of desirable and undesirable products outputs in which undesirable products can be used in the systems. The present paper proposes a DEA-based method for evaluating the relative efficiency of such a two-stage-feedback network structure with undesirable factors. Directional distance function along with weak disposability assumption for undesirable outputs has been used to analyse the performance of the network. A real case on ecological system of 31 regions in China is used to illustrate the applicability of the proposed approach.

Źródło:

Operations Research and Decisions; 2019, 29, 3; 51-66
2081-8858
2391-6060

Pojawia się w:

Operations Research and Decisions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

The agricultural production in mathematical models

Autorzy:

Parlinska, M.
Dareev, G.

Powiązania:

https://bibliotekanauki.pl/articles/572910.pdf

Data publikacji:

2011

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

agricultural production
mathematical model
agriculture
production function
analysis method
economic process
technological process

Opis:

The theoretical questions of mathematical modeling of agricultural production processes are described. Production of agricultural goods and foodstuffs is modeled except for the production of forage and involvement of equipment and techniques, buildings, infrastructure etc. The model is based on a division of economic and technological processes in agriculture into four stages specific for agribusiness. A mathematical description of four stages in used production functions is provided.

Źródło:

Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2011, 11(26), 3
2081-6960

Pojawia się w:

Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Some generalized method for constructing nonseparable compactly supported wavelets in L2(R2)

Autorzy:

Banaś, W.

Powiązania:

https://bibliotekanauki.pl/articles/255291.pdf

Data publikacji:

2013

Wydawca:

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

Tematy:

compactly supported wavelet
compactly supported scaling function
multiresolution analysis
dilation matrix
orthonormality
accuracy

Opis:

In this paper we show the construction of nonseparable compactly supported bi-variate wavelets. We deal with the dilation matrix [formula] and some three-row coefficient mask; that is a scaling function that satisfies a dilation equation with scaling coefficients which can be contained in the set {cn} n ∈ s where S = S1 x {0, 1, 2}, S1 ⊂ N, #S1 < ∞

Źródło:

Opuscula Mathematica; 2013, 33, 2; 223-235
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Non-Parametric Test for the Existence of the Common Deterministic Cycle: The Case of the Selected European Countries

Autorzy:

Lenart, Łukasz
Pipień, Mateusz

Powiązania:

https://bibliotekanauki.pl/articles/2076426.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

testing deterministic cycles
subsampling
spectral analysis
almostperiodic mean function
Almost Periodically Correlated time series

Opis:

The aim of the article is to construct an asymptotically consistent test, based on a subsampling approach, to verify hypothesis about existence of the individual or common deterministic cycle in coordinates of multivariate macroeconomic time series. By the deterministic cycle we mean the periodic or almost periodic fluctuations in the mean function in cyclical fluctuations. To construct test we formulate a multivariate non-parametric model containing the business cycle component in the unconditional mean function. The construction relies on the Fourier representation of the unconditional expectation of the multivariate Almost Periodically Correlated time series and is related to fixed deterministic cycle presented in the literature. The analysis of the existence of common deterministic business cycles for selected European countries is presented based on monthly industrial production indexes. Our main findings from the empirical part is that the deterministic cycle can be strongly supported by the data and therefore should not be automatically neglected during analysis without justification.

Źródło:

Central European Journal of Economic Modelling and Econometrics; 2017, 3; 201-241
2080-0886
2080-119X

Pojawia się w:

Central European Journal of Economic Modelling and Econometrics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Record-based inference and associated cost analysis for the Weibull distribution

Autorzy:

Doostparast, M.

Powiązania:

https://bibliotekanauki.pl/articles/205931.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

cost analysis
likelihood function
record data
total time on test
Weibull model
lifetime model

Opis:

In statistical process control, record schemes are used to reduce the total time on test for the inspection inquiry. In these schemes, units are examined sequentially and successive minimum values are recorded. On the basis of record data, Samaniego and Whitaker (1986) obtained the maximum likelihood (ML) estimate of the mean for an exponential distribution. Since the two parameter Weibull model, as an extension of the exponential distribution, has a wide range of application, Hoinkes and Padgett (1994) derived the record-based ML estimators for the parameters of interest in this model. This paper shows that the ML estimates of the Weibull parameters do not always exist for the basis of records. Thus, a new scheme is proposed, in which the ML estimates of the parameters always exist. An analytic cost-based comparison between the usual and the New scheme is also carried out. Finally, some concluding remarks and open problems are formulated.

Źródło:

Control and Cybernetics; 2015, 44, 1; 163-177
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Zastosowanie radialnych funkcji bazowych do analizy akustycznych drgań własnych kabiny pojazdu
Application of Radial Basis Function Method to the acoustic eigenvalues problem analysis of vehicle cabin

Autorzy:

Majkut, L.
Olszewski, R.

Powiązania:

https://bibliotekanauki.pl/articles/310747.pdf

Data publikacji:

2017

Wydawca:

Instytut Naukowo-Wydawniczy "SPATIUM"

Tematy:

analiza akustyczna
eksploatacja pojazdów
radialne funkcje bazowe
acoustic analysis
exploitation vehicle
radial basis function

Opis:

W artykule opisano możliwości zastosowania Metody Funkcji Radialnych do wyznaczania akustycznych częstotliwości drgań własnych w przestrzeniach ograniczonych. Porównano metodyki popularnych narzędzi obliczeniowych takich jak Metoda Elementów Skończonych i Metoda Elementów Brzegowych wraz ze wskazaniem wad i zalet do Metody Funkcji Radialnych.
In the paper the possibility of Radial Basis Function Method for the calculation of acoustic eigenvalues is described. The proposed method is compared with other numerical methods of wave acoustic. The advantages and disadvantages of Finite Element Method and Boundary Element Method are described and compared to proposed Radial Basis Function Method.

Źródło:

Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 1110-1113, CD
1509-5878
2450-7725

Pojawia się w:

Autobusy : technika, eksploatacja, systemy transportowe

Dostawca treści:

Biblioteka Nauki

/5

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