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Wyświetlanie 1-15 z 582
Tytuł:
Simulation Tools for Analysis and Design of Distribution Networks with Distributed Energy Resources
Autorzy:
Martinez-Velasco, J. A.
de Leon, F.
Dinavahi, V.
Powiązania:
https://bibliotekanauki.pl/articles/262787.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
distribution systems
distributed energy resources
distributed generation
simulation
Opis:
Distributed energy resources (DER) are a combination of distributed generation, energy storage and demand-side measures. DER can be used to help utilities solve problems on the distribution system by supporting voltage, reducing losses, providing backup power, improving local power quality7 and reliability, or deferring distribution system upgrade. They present, however, some important drawbacks such as new protection coordination problems, complicated operating procedures, or intermittent nature of renewable sources. All these issues complicate the analysis of distribution systems with a high penetration of DER devices. Required simulation tools must therefore combine analysis and modelling capabilities for representing the various DER technologies accurately. Since distribution systems were not designed for the inclusion of DER, most distribution software packages were not designed for the analysis of systems with embedded generation either. Present software designed for the study of distribution systems can efficiently cope with unbalanced load-flow and short circuit calculations, load growth studies, or system restoration and contingency analysis. However, they do not deal with transient stability and small signal stability because traditionally there was no generation at distribution level. This situation is changing, software manufacturers are updating and expanding tool capabilities to take into account the new simulation challenges, and new and specialized tools have been developed to cope with problems related to the installation of DER devices. This paper is aimed at reviewing the present status and the future trends of simulation tools for analysis and planning of distribution systems with penetration of DER, including market-oriented analysis and real-time simulation.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2009, 15, 1; 33-50
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deterministic properties of serially connected distributed lag models
Autorzy:
Nowak, P.
Gadomski, J.
Powiązania:
https://bibliotekanauki.pl/articles/406350.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
distributed lags
limit properties
characteristics of distributed lags
Opis:
Distributed lag models are an important tool in modeling dynamic systems in economics. In the analysis of composite forms of such models, the component models are ordered in parallel (with the same independent variable) and/or in series (where the independent variable is also the dependent variable in the preceding model). This paper presents an analysis of certain deterministic properties of composite distributed lag models composed of component distributed lag models arranged in sequence, and their asymptotic properties in particular. The models considered are in discrete form. Even though the paper focuses on deterministic properties of distributed lag models, the derivations are based on analytical tools commonly used in probability theory such as probability distributions and the central limit theorem.
Źródło:
Operations Research and Decisions; 2013, 23, 3; 43-55
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards transparent data access with context awareness
Autorzy:
Wrzeszcz, M.
Słota, R.
Kitowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/305299.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
distributed
transparent data access
distributed data storage
context awareness
Opis:
Open-data research is an important factor accelerating the production and analysis of scientific results as well as worldwide collaboration; still, very little data is being shared at scale. The aim of this article is to analyze existing data-access solutions along with their usage limitations. After analyzing the existing solutions and data-access stakeholder needs, the authors propose their own vision of a data-access model.
Źródło:
Computer Science; 2018, 19 (2); 201-221
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of distributed systems dynamics with Erlang Performance Lab
Autorzy:
Ślaski, M.
Turek, W.
Gil, A.
Szafran, B.
Paciorek, M.
Byrski, A.
Powiązania:
https://bibliotekanauki.pl/articles/305613.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
software engineering
distributed computing and simulation
distributed systems monitoring
Opis:
Modern, highly concurrent, and large-scale systems require new methods for design, testing, and monitoring. Their dynamics and scale require real-time tools that provide a holistic view of the whole system and the ability to show a more detailed view when needed. Such tools can help identify the causes of unwanted states, which is hardly possible with a static analysis or metrics-based approach. In this paper, a new tool for the analysis of distributed systems in Erlang is presented. It provides the real-time monitoring of system dynamics on diferent levels of abstraction. The tool has been used for analyzing a large-scale urban trafic simulation system running on a cluster of 20 computing nodes.
Źródło:
Computer Science; 2018, 19 (2); 139-155
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance evaluation of the MSMPS algorithm under different distribution traffic
Autorzy:
Danilewicz, G.
Dziuba, M.
Powiązania:
https://bibliotekanauki.pl/articles/308677.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
connection pattern
diagonally distributed traffic
lin-diagonally distributed traffic
MQL matrix
non-uniformly distributed traffic
switching fabric
Opis:
In this paper, the Maximal Size Matching with Permanent Selection (MSMPS) scheduling algorithm and its performance evaluation, under different traffic models, are described. In this article, computer simulation results under nonuniformly, diagonally and lin-diagonally distributed traffic models are presented. The simulations was performed for different switch sizes: 4×4, 8×8 and 16×16. Results for MSMPS algorithm and for other algorithms well known in the literature are discussed. All results are presented for 16×16 switch size but simulation results are representative for other switch sizes. Mean Time Delay and efficiency were compared and considered. It is shown that our algorithm achieve similar performance results like another algorithms, but it does not need any additional calculations. This information causes that MSMPS algorithm can be easily implemented in hardware.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 3; 74-79
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance evaluation of different types of session guarantees version vectors
Autorzy:
Piątkowski, Ł.
Sobaniec, C.
Sobański, G.
Powiązania:
https://bibliotekanauki.pl/articles/206073.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
session guarantees
distributed
replication
Opis:
Session guarantees define consistency properties of replicas in a distributed system from the point of view of a single, migrating client. Consistency is checked by ensuring execution of required operations by servers. Consistency protocols of session gua- rantees usually use version vectors for efficient representation of sets of writes. This paper presents performance evaluation of several consistency protocols of session guarantees that use different forms of version vectors. The evaluation was carried out by means of simu- lation experiments.
Źródło:
Control and Cybernetics; 2011, 40, 3; 731-749
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of optimization of distributed databases in oracle. Part 1
Autorzy:
Barczak, A.
Zacharczuk, D.
Pluta, D.
Powiązania:
https://bibliotekanauki.pl/articles/92877.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
optimization
distributed databases
Oracle
Opis:
The paper presents actions required to tune a distributed database to obtain optimal the performance. Each method and its impact on the performance of a database depending on the environment or configuration is discussed. The last part of the paper describes the stages of the process and data to be collected to obtain positive results.
Źródło:
Studia Informatica : systems and information technology; 2016, 1-2(20); 5-15
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of blockchain technology implementations in finance industry
Autorzy:
Kołodziej, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2097008.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Komitet Nauk o Finansach PAN
Tematy:
blockchain
distributed ledger
tokens
Źródło:
FINANSE Czasopismo Komitetu Nauk o Finansach PAN; 2019, 1; 43-55
1899-4822
Pojawia się w:
FINANSE Czasopismo Komitetu Nauk o Finansach PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sieciowy rozproszony system pomiarowy w laboratorium dydaktycznym
Network distributed measurement system in didactic laboratory
Autorzy:
Pałczyńska, B.
Noga, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/267839.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
rozproszone systemy pomiarowe
technologia inteligencji rozproszonej
distributed measurement systems
distributed intelligence technology
Opis:
Zaprezentowano możliwości wykorzystania do celów dydaktycznych specjalistycznego narzędzia programistycznego, zdecydowanie upraszczającego oprogramowanie rozproszonego systemu pomiarowego. Przedstawiono system pomiarowy, zaprojektowany w graficznym środowisku programistycznym LabVIEW. Opisano stanowisko laboratoryjne, składające się z kilku węzłów z dostępem do sieci komputerowej, w którym funkcje procesu pomiaru i sterowania oraz kontrola pomiaru są wykonywane jako rozproszone w różnych węzłach systemu pomiarowego. Scharakteryzowano wykorzystane w rozwiązaniu elementy programowe środowiska LabVIEW; projekt i sieciowe zmienne współdzielone. Przedstawiono organizację zaprojektowanego rozproszonego systemu pomiarowego, zawarto uwagi dotyczące konfigurowania i uruchamiania systemu.
This paper presents the application possibilities of the commercially available software tools oriented to the design of distributed measurement system for educational purposes. The network distributed measurement system based on graphical programming environment LabVIEW is shown. It has been designed and applied at the Department of Maritime Telecommunications in Gdynia Maritime University for the tutored and self-education purposes. Students have an opportunity to execute a remote measurement as well as design, carry out and supervise their own projects using the graphical programming environment with ready-made instrument drivers (serial and DAQ boards). The position of the laboratory, consisting of several nodes with access to a computer network, in which the functions of the process and control of measurement have been dispersed is described. The advantages of the implemented components of the LabVIEW programming environment are indicated. The using such tools as the LabVIEW project, shared variables interface with the Shared Variable Engine significantly simplifying the programming of distributed application, which requires various forms of communication and data sharing. The presented distributed system assigned for the didactic laboratory is easily extensible. The application possibilities are virtually unlimited thanks to attaching additional measurement and client nodes.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 52; 105-108
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coherent Adaptive and Rational Action Selection Problem Solution for Mobile Robots
Autorzy:
Szynkarczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/384476.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
robot
data processing
distributed controller
Opis:
The article deals with the issue of controlling the autonomous mobile systems. Considered are problems focusing around the use of distributed architecture controllers. In contrary to hierarchical architecture, all layers of distributed controller are operating simultaneously, and have an access to both: the sensors (receptors), as well as to the executing systems (effectors) of controlled autonomous mobile system. Simultaneous operation of all layers of the distributed architecture controller entails arising of so called action selection problem. This problem consists in continuous taking of decisions: which one of the layers, or which layers of controller, at given moment should have an influence on the movement of controlled object. Discussed is the proposal of a new solution of this problem. Presented are results of experiments with the use of mobile robot.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 1; 54-65
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of optimization of distributed databases in oracle. Part 2
Autorzy:
Barczak, A.
Zacharczuk, D.
Pluta, D.
Powiązania:
https://bibliotekanauki.pl/articles/93036.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
optimization
distributed databases
Oracle
tests
Opis:
The second part of the paper devoted to optimization of distributed databases. This part presents tests which confirm the efficiency of database tuning methods, described in part one. Analysis of tests results based on the developed database is presented.
Źródło:
Studia Informatica : systems and information technology; 2017, 1-2(21); 15-46
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The distributed energy sector in Poland : current status, challenges, barriers, and the Danish experience
Autorzy:
Tałan, Karol
Powiązania:
https://bibliotekanauki.pl/articles/2085631.pdf
Data publikacji:
2021
Wydawca:
Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Tematy:
decarbonization
distributed energy
PEP2040
Opis:
The article presents the current state of distributed energy in Poland, with particular emphasis on the energy transition plans, analyzing the document Polish Energy Policy until 2040 (PEP2040). Additionally, describes three types of entities: prosumers, energy clusters and energy cooperatives. The author explains their current status, funding sources and barriers. The second part of the publication presents the author's reflections on the problems and challenges related to the development of biogas and wind energy. Additionally, the author focuses on the impact of distributed generation on the power system. Social and local governmental aspects are also presented. In the third part, the author presents the Danish experience in the development of renewable energy sources and distributed generation. The author presents two examples of solutions: a civic foundation in Hvide Sande and a district heating company in Gram. Conclusions of the article includes the proposal of changes to the legislative system that will enable further RES development. In addition, the author draws attention to the impact of the Mój Prąd programme, responsible for the high growth of installed capacity.
Źródło:
Energy Policy Studies; 2021, No. 1 (7); 12-26
2545-0859
Pojawia się w:
Energy Policy Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Erlang-based software update platform for mobile devices
Autorzy:
Wielgus, M.
Dąbek, P.
Janusz, R.
Kowal, T.
Turek, W.
Powiązania:
https://bibliotekanauki.pl/articles/305351.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Erlang
software updates
distributed system
Opis:
Growing computational power of mobile devices modifies existing approaches to data processing in large-scale sensor networks. Since sensors are no longer limited to simple data acquisition tasks, such networks can be considered complex geodistributed data processing systems. Features and requirements of such systems justify use of Erlang language and technology for programming mobile devices.The technology provides several crucial features, including fault tolerance, message-passing concurrency or hot-code loading. In this paper the problem of software management in Erlang-based distributed systems is discussed. A mechanism for installing and upgrading Erlang applications using operating system package manager is described. A platform for updating software in largescale systems is presented.
Źródło:
Computer Science; 2013, 14 (1); 129-141
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal placement and sizing of distributed generator units using genetic optimization algorithms
Autorzy:
Haesens, E.
Espinoza, M.
Pluymers, B.
Goethals, I.
Thong, V. V.
Driesen, J.
Belmanss, R.
Moor, B. de
Powiązania:
https://bibliotekanauki.pl/articles/262691.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
distributed generation
optimization methods
microgrid
Opis:
In this article the authors describe how genetic optimization algorithms can be used to find the optimal size and location of distributed generation units in a residential distribution grid. Power losses are minimized while the voltage profile is kept at an acceptable level. The method is applied on a system based on an existing grid topology with production and residential load data based on measurements. Different scenarios are chosen to run the algorithm. The obtained optimal location and size prove to depend strongly on the given conditions.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 1; 97-104
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contributos para uma análise sintática dos objetos cognatos em PE
Towards a syntactic analysis of European Portuguese cognate objects
Autorzy:
Morgado Choupina, Celda
Powiązania:
https://bibliotekanauki.pl/articles/1051300.pdf
Data publikacji:
2013-01-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
syntax
cognate objects
Distributed Morphology
Opis:
The present paper aims at discussing selected syntactic aspects of cognate objects in European Portuguese, along the lines of Distributed Morphology (Haugen, 2009). Cognate objects may be readily discovered in numerous human languages, including European Portuguese (Chovia uma chuva miudinha). It is assumed in papers devoted to their English counterparts that they belong to various subclasses. Indeed, some of them are genuine cognates (to sleep a sleep...) or hyponyms (to dance a jig; Hale & Keyser, 2002). It turns out that in European Portuguese, they can be split into four different categories: (i) genuine cognate objects (chorar um choro...), (ii) similar cognate objects (dançar uma dança) (iii) objects hyponyms (dançar um tango) and (iv) prepositional cognate objects (morrer de uma morte ...). There are, then, significant differences between various classes of cognate objects: whereas the genuine ones call imperatively for a restrictive modifier and a definite article, the remaining ones admit it only optionally. It might be concluded, then, that a lexicalist theory set up along the lines of Hale and Keyser is unable to deal successfully with distributional facts proper to various classes of cognate constructions in European Portuguese. That is why the present study is conducted more in accordance with syntactic principles of Distributed Morphology, with a strong impact of hypotheses put forward by Haugen (2009).
Źródło:
Studia Romanica Posnaniensia; 2013, 40, 1; 59-79
0137-2475
2084-4158
Pojawia się w:
Studia Romanica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 582

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