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Tytuł:
Auditory occupancy grids with a mobile robot
Autorzy:
DeJong, B. P.
Powiązania:
https://bibliotekanauki.pl/articles/384355.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
auditory occupancy grids
sound localization
occupancy grids
mobile robot
Opis:
This paper presents the use of auditory occupancy grids (AOGs) for mapping of a mobile robot’s acoustic environment. An AOG is a probabilistic map of sound source locations built from multiple measurements using techniques from both probabilistic robotics and sound localization. The mapping is simulated, tested for robustness, and then successfully implemented on a threemicrophone mobile robot with four sound sources. Using the robot’s inherent advantage of mobility, the AOG correctly locates the sound sources from only nine measurements. The resulting map is then used to intelligently position the robot within the environment and to maintain auditory contact with a moving target.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 3; 3-12
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance aspects of data delivery using hierarchical storage management systems in the grid
Autorzy:
Nikolow, D.
Słota, R.
Kitowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1964210.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
HSM
grids
time estimation
Opis:
Grid computing has recently gained in popularity. Grid applications can be very demanding of the data storage facilities in the Grid. The existing data grid services are often insufficient and additional optimization of the data access is necessary. This paper presents research concerning the optimization aspects of data management for Hierarchical Storage Management (HSM) systems in the Grid.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 537-548
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dasymetric modelling of population distribution – large data approach
Autorzy:
Dmowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1051042.pdf
Data publikacji:
2019-03-31
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
population grids
dasymetric modelling
R
Opis:
Existing resources of population data, provided by national censuses in the form of areal aggregates, have usually insufficient resolution for many practical applications. Dasymetric modelling has been a standard technique to disaggregate census aggregates into finer grids. Although dasymetric modelling of population distribution is well-established, most literature focuses on proposing new variants of the technique, while only few are devoted to developing broad-scale population grids that could be used for real-life applications. This paper reviews literature on construction of broad-scale population grids using dasymetric modelling. It also describes an R implementation of fully automated framework to calculate such grids from aggregated data provided by national censuses. The presented implementation has been used to produce high resolution, multi-year comparable, U.S.-wide population datasets that are the part of the SocScape (Social Landscape) project.
Źródło:
Quaestiones Geographicae; 2019, 38, 1; 15-27
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On calculations of the dipole moment from the electron density data
Autorzy:
Gryciuk, M.
Górecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1931585.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
electron density
dipole moment
grids
Opis:
In the paper we discuss how to calculate the dipole moment using the electron density data. A few numerical methods are compared. We have found that usually the interpolation of electron density gives the most accurate results.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 661-668
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the operation of earth fault relays by auto earthing-connection at earth fault situations in 6kV mining grid of Quang Ninh
Poprawa działania przekaźników ziemnozwarciowych poprzez automatyczne połączenie uziemiające w sieci górniczej 6kV w Quang Ninh
Autorzy:
Bun, Ho Viet
Thanh, Le Xuan
Powiązania:
https://bibliotekanauki.pl/articles/318091.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
górnictwo
Wietnam
przekaźniki
mining
Vietnam
grids
Opis:
Single phase earth-fault in MV grids usually causes overvoltage that harm to human being and electric equipments. In 6kV mining grids of Vietnam, earth fault which is majority incident accounts 55% to 73% of the total faults. When earth fault occurs many grids’ eco-technical parameters will be affected. Moreover, the overvoltage and earthing current can lead to serious electric shock accidents caused mainly by stepping-overvoltage or touching-overvoltage. One of earthing relays requirements is to trip in minimum time duration in order to reduce the magnitude of earthing currents and overvoltage. Base on the simulation in Matlab, the paper suggests a prior connection diagram that allows an auto earthing-connection for improving the better performance of relays. The utilization of the diagram will help to decrease the tripping time of relays, reduce the amplitude of internal overvoltage as well as enhance the safety for human being in case of earthing incidents.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 52-57
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interactive Grid computing: adapting high level architecture-based applications to the Grid
Autorzy:
Rycerz, K.
Bubak, M.
Malawski, M.
Sloot, P.
Powiązania:
https://bibliotekanauki.pl/articles/1964209.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
interactive simulation
grids
grid computing
HLA
OGSA
Opis:
In this paper we present the design of a Grid HLA Management System (GHMS) supporting execution of High Level Architecture-based interactive applications in a Grid environment, while at the same time allowing for running HLA legacy codes to preserve backward compatibility with the HLA standard. In particular, we describe the following system components: an HLA-Speaking Service for multiple federates that interface the HLA application to the system, a Monitoring Service integrated with the OCMG monitoring system and HLA-based Benchmark Services informing the Broker Service of what can be expected from the application's behavior.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 549-559
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wybranych koncepcji rekonfiguracji sieci średniego napięcia na poziom strat energii
MV grid reconfiguration simulation with varying daily demand conditions
Autorzy:
Kąkol, A.
Powiązania:
https://bibliotekanauki.pl/articles/267135.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
distribution grids
automatization
sieci dystrybucyjne
automatyzacja
optymalizacja
Opis:
W artykule przedstawiono propozycję wykorzystania łączników zdalnie sterowalnych do obniżenia strat energii elektrycznej w sieci SN przy uwzględnieniu dobowych zmian zapotrzebowania. Porównano wartości strat energii elektrycznej na analizowanym fragmencie sieci przy założeniu braku ingerencji dyspozytora w układ pracy sieci, rekonfiguracji sieci zgodnie z opracowanym wcześniej harmonogramem oraz rekonfiguracji sieci w odpowiedzi na aktualne zmiany zapotrzebowania.
DSOs are seeking for MV grid reliability improvements in order to decrease occurrence of power supply interruptions and improve voltage quality. As a result, the automatization of medium voltage grid is progressing. In parallel, independently from grid improvements plans, the amount of distributed generation installed power is increasing. This leads to loading and voltage variations. The inversed power flows are more common as they are depended on the correlation between demand and availability of energy source, like wind and sunshine. There is an expectation that battery energy storage and electric vehicle, new types of objects connected to power system, will have a crucial impact on the grid performance at near future. There is a need to develop smart solutions due to fact, that MV grid development is not economically effective way to deal with all new problems. The proposal of MV grid operation improvement will be presented in the article. Remote controlled switches together with measurement devices will be utilized to reconfiguration of the grid as a response to varying demand. The scheduled and on-line reconfiguration operation schemes will be taken into consideration. Finally, the grid performance for aforementioned operation schemes will be executed and compared.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 53; 129-132
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda analizy niezawodności układów rozdzielczych średnich napięć
A method of medium voltage distributiion systems reliability analysis
Autorzy:
Bargiel, J.
Sowa, P.
Zając, K.
Sierociński, T.
Powiązania:
https://bibliotekanauki.pl/articles/397119.pdf
Data publikacji:
2011
Wydawca:
ENERGA
Tematy:
sieć energetyczna
sieć średniego napięcia
middle voltage grids
Opis:
W artykule przedstawiono jedną z najbardziej aktualnych metod i program obliczeniowy do oceny niezawodności zasilania odbiorców z sieci średnich napięć w kraju. Jest to rozszerzenie metody i programu NIEZ, opracowanych w IESU dla sieci przesyłowej WN i 110 kV. Przedstawiono główne założenia metody oraz modelu obliczeniowego, a także przykładowe wyniki obliczeń dla modelowego fragmentu sieci średniego napięcia.
This article presents one of the most current methods and a computer program for evaluation of the reliability of power supply of recipients in middle voltage grids in the country. It is an extension of the NIEZ method and program, developed at the Power Engineering Institute of the Silesian University of Technology for the HV and 110 kV transmission grid. The main assumptions of the method and computational model, as well as exemplary calculation results for a medium voltage grid model section, are presented.
Źródło:
Acta Energetica; 2011, 4; 5-12
2300-3022
Pojawia się w:
Acta Energetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przyszłość energetyki – nowe wyzwanie cywilizacyjne
Energy of the future – new challenge of civilization
Autorzy:
Sedler, B.
Powiązania:
https://bibliotekanauki.pl/articles/266798.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
energetyka rozproszona
inteligentne sieci
intelligent grid
smart grids
Opis:
Energetyka stawia przed Unią Europejską nowe wyzwanie związane z koniecznością przebudowy jej struktury, zwiększenia bezpieczeństwa dostaw, uwzględnienia wymogów ekologicznych i zapewnienia możliwie niskich cen dla konsumentów. Przyszłość należy do energetyki rozproszonej opartej na źródłach konwencjonalnych i odnawialnych oraz małej energetyki jądrowej. Warunkiem niezbędnym i koniecznym jest budowa inteligentnych sieci przesyłu i dystrybucji (Smart Grid).
Power for the European Union poses a new challenge of rebuilding its structure, increase security of supply, to take account of environmental requirements and to ensure the lowest possible prices for consumers. The future belongs to the distributed energy sources based on conventional and renewable and small nuclear energy. And a necessary prerequisite is to build a "intelligent grid" transmission and distribution lines ("Smart Grids").
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2011, 29; 53-56
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CrossGrid - tools and services for interactive grid applications
Autorzy:
Bubak, M.
Malawski, M.
Rycerz, K.
Turała, M.
Powiązania:
https://bibliotekanauki.pl/articles/1964214.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
grids
architecture
services
interactive applications
Globus Toolkit
OGSA
Opis:
The CrossGrid Project aims to develop new Grid services and a tool environment for a representative set of interactive compute- and data-intensive applications. This paper presents the architecture of the software and a description of the functionality of the main components. The new tools and grid services are based on the Globus Toolkit and the EU DataGrid middleware. CrossGrid develops and operates a large international testbed, where the developed applications, services and tools are deployed and run.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 503-512
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring GRID resources: JMX in action
Autorzy:
Balos, K.
Radziszowski, D.
Rzepa, P.
Zieliński, K.
Zieliński, S.
Powiązania:
https://bibliotekanauki.pl/articles/1964215.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska
Tematy:
JMX
grids
monitoring
distributed system
SOA
web services
Opis:
This paper summarizes research on monitoring GRID resources, which resulted in the implementation of the JIMS system. It contains an overview of the most important architectural and software concepts that make the constructed system flexible and user-friendly. The paper evaluates JMX and Web Service technologies as foundations for implementing monitoring systems. Particular attention has been paid to system adaptability, autoconfiguration and interoperability.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2004, 8, 4; 487-501
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyber Security of Electrical Grids – A Contribution to Research
Autorzy:
Włodyka, Ewa Maria
Kaczmarek, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/31342016.pdf
Data publikacji:
2024-05-20
Wydawca:
Akademia Sztuki Wojennej
Tematy:
electrical grids
public administration
cyber security
critical infrastructure
Opis:
The state’s critical infrastructure involves those elements that function independently yet are interconnected. It is also affected by ICT networks that exist in other states. These interdependencies make critical infrastructure particularly vulnerable to cyber attacks. At the same time, it is electrical grids that constitute the most crucial element of critical infrastructure. The research hypothesis assumes an urgent need to comprehensively address the cyber security policy of electrical grids in a broader perspective, not only the technical one but also taking into account public policies and the human factor. Quantitative and qualitative methods, literature survey and the desk research method were employed in order to verify this hypothesis. The analyses carried out by the Authors indicated unequivocally that electrical grids constitute an element of the critical infrastructure that is the most vulnerable to cyber threats.
Źródło:
Cybersecurity and Law; 2024, 12, 2; 260-272
2658-1493
Pojawia się w:
Cybersecurity and Law
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capability of synchronous machines to ride through events with high ROCOF
Autorzy:
Assenkamp, Alf
Kreischer, Christian
Kulig, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/140451.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ROCOF
under-excitation protection
turbo-generator
low-inertia grids
Opis:
The transition of power grids to implement large amounts of nonsynchronous renewables reduces the inertia in the power system. Therefore, the rate of change of fre- quency (ROCOF) after a fault of given energy is higher in low inertia grids than in grids with mainly synchronous machines operating. Standard faults for the design of existing synchronous machines assume fixed frequency grids, in which an electrically close fault happens. It is not tested, if the machines can ride through transient disturbances with high ROCOF. For ROCOF values of up to 1 Hz/s as foreseen for the upcoming grid code of the Republic of Ireland and up to 2 Hz/s for Northern Ireland, a thorough verification, if generators are capable to ride through such events is necessary. For this study, ROCOF frequency traces provided by the transmission system operators (TSOs) of Ireland were first benchmarked with a full-grid model and in a second step impressed on a model of generators connected to the power grid via a step-up transformer to study transient stability and nonlinear response of the generator. This paper focusses on the ability of nine different synchronous machines to stay connected to the transmission system during severe ROCOF events without losing synchronism.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 325-339
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of grounding grids parameter at arbitrary geometry
Autorzy:
Silva, C. L. B.
Pires, T. G.
Calixto, W. P.
Oliveira, D. N.
Souza, L. A. P.
Filho, A. M. S.
Powiązania:
https://bibliotekanauki.pl/articles/136173.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
grounding grids parameters
Heppe
soil stratified in two layers
Opis:
This paper deals with the computation of ground resistance, surface voltage, touch voltage and step voltage, to mesh with horizontal wires arranged in different angles. The computer program implemented used in the mathematical modeling is based on the method proposed by Heppe, which allows obtaining the grounding parameters for homogeneous soil and soil stratified in two layers. The results obtained with the proposed method will be compared with other methods in literature. Also will be presented the results of a grounding grid using wires at various angles.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 2; 11-17
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the importance of the e-infrastructure for science
Autorzy:
Stroiński, Maciej
Węglarz, Jan
Powiązania:
https://bibliotekanauki.pl/articles/704267.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
e-infrastructure
computer networks
grids
information and telecommunication technology
Opis:
In this article the European scientific e-infrastructure is described with special emphasis on the contribution of the Polish scientific community. Examples of this infrastructure for radioastronomy, high-energy physics and medicine are presented. Directions of further development in the field are pointed out.
Źródło:
Nauka; 2008, 2
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrigendum to "acyclic sum-list-colouring of grids and other classes of graphs" [Opuscula Math. 37, no. 4 (2017), 535 556]
Autorzy:
Drgas-Burchardt, E.
Drzystek, A.
Powiązania:
https://bibliotekanauki.pl/articles/254952.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sum-list colouring
acyclic colouring
grids
generalized Petersen graphs
Opis:
This note provides some minor corrections to the article [Acyclic sum-list-colouring of grids and other classes of graphs, Opuscula Math. 37, no. 4 (2017), 535-556].
Źródło:
Opuscula Mathematica; 2018, 38, 6; 899-901
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acyclic sum-list-colouring of grids and other classes of graphs
Autorzy:
Drgas-Burchardt, E.
Drzystek, A.
Powiązania:
https://bibliotekanauki.pl/articles/254959.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sum-list colouring
acyclic colouring
grids
generalized Petersen graphs
Opis:
In this paper we consider list colouring of a graph G in which the sizes of lists assigned to different vertices can be different. We colour G from the lists in such a way that each colour class induces an acyclic graph. The aim is to find the smallest possible sum of all the list sizes, such that, according to the rules, G is colourable for any particular assignment of the lists of these sizes. This invariant is called the D1-sum-choice-number of G. In the paper we investigate the D1-sum-choice-number of graphs with small degrees. Especially, we give the exact value of the D1-sum-choice-number for each grid [formula], when at least one of the numbers n, rn is less than five, and for each generalized Petersen graph. Moreover, we present some results that estimate the D1-sum-choice-number of an arbitrary graph in terms of the decycling number, other graph invariants and special subgraphs.
Źródło:
Opuscula Mathematica; 2017, 37, 4; 535-556
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Smart Grids after the Third Liberalization Package: Current Developments and Future Challenges for Regulatory Policy in the Electricity Sector
Autorzy:
Swora, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/530219.pdf
Data publikacji:
2011-06-01
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
smart grids
smart metering
energy regulation
output-based regulation
Opis:
The smart grid is a concept for the development of power distribution grids that offers great promise for the realization of the ambitious objectives of European Energy Policy. In its Third Energy Liberalization Package, European energy law has introduced the concept of intelligent grids and intelligent metering systems. A new directive of EPBD (energy performance of buildings) is to press ahead with this trend. At the same time work is underway at the European Commission and with European Regulators concerning standardization and the new shape of regulatory policy in the implementation stage. The EU legislation and regulatory policy of the National Regulatory Authorities will have to take into consideration the current trends in the modernization of the networks. Among other things, this means revising the existing regulatory model, and that will have to take into account the performance and output of industry networks.
Smart Grid est le concept du développement des réseaux de la distribution de l’électricité, qui donne la chance de réaliser des objectifs de grande importance de la perspective des Politiques Européennes de l’Énergie. Le droit européen de l’énergie a introduit, dans son troisième paquet de libéralisation, le concept des réseaux intelligents et des systèmes de compteurs intelligents. La nouvelle directive sur la performance énergétique des bâtiments (EPBD) constitue une continuation de cette tendance. Au même temps, les travaux des la Commission Européenne et des Régulateurs Européens concernant la standardisation et la nouvelle forme des politiques de régulation, sont réalisés. La législation de l’UE et la politique de régulation des autorités réglementaires, doivent prendre en considération les tendances contemporaines de la modernisation des réseaux. Cela signifie, entre autre, une révision du modèle de régulation existant, qui doit prendre en considération la performance et les effets des réseaux de l’industrie.
Źródło:
Yearbook of Antitrust and Regulatory Studies; 2011, 4(4); 9-22
1689-9024
2545-0115
Pojawia się w:
Yearbook of Antitrust and Regulatory Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power Quality and EMC in Smart Grid
Autorzy:
Olofsson, M.
Powiązania:
https://bibliotekanauki.pl/articles/262754.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
power quality
voltage quality
EMC
electromagnetic compatibility
smart grids
renewables
Opis:
Smart Grid is increasingly seen as a means to facilitate climate friendly renewable energy sources (renewables) and to enable efficient use of electricity. For example, modern electrical networks can link wind- and solar power with electric cars. A consequence of Smart Grid is a drastic increase in use of electronics in the power system. This makes the satisfactory function of electrical and electronic equipment vital for realization of a robust Smart Grid. This paper focuses on the satisfactory function of equipment for Smart Grid with respect to electromagnetic disturbances, i.e. EMC – Electromagnetic Compatibility including Power Quality. Finally, a framework for the apportioning of responsibilities between network operators and the parties being responsible for the connection of equipment is proposed.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2009, 15, 2; 7-12
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Bayesian Network approach for risk assessment to a spatially distributed power infrastructure in a GIS environment
Autorzy:
Quan, L. B.
Garrè, L.
Yang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2069299.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
risk assessment
geographical information system
GIS
Bayesian networks
Power Grids
Opis:
One of the most important applications of spatial data regards the ability to inform decision makers on spatially distributed and disaggregated hazards and risks, thus enhancing strategic decision making on how to manage and limit risks for a given area or region and prioritize investments. However, a full risk based adaptation assessment inside a Geographical Information System (GIS) can be cumbersome, since some complex tasks cannot be carried out directly. One example of these tasks involves Bayesian probabilistic analysis and decision making, which is a fundamental component of risk analysis, yet requires dedicated tools/software which usually do not belong to a standard GIS portfolio. For this reason, exploring the various capabilities of a GIS platform in connection with a Bayesian Network (BN) software is essential. The objective is to have an effective tool for knowledge representation and reasoning under the influence of uncertainty that can be displayed in a spatial manner. A case study using this tool was performed to assess the risk levels faced by the electrical distribution system of Long Island because of storm events as the Sandy Storm.
Źródło:
Journal of Polish Safety and Reliability Association; 2015, 6, 3; 127--132
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Efficient Scheduling Methods for Computational Grids and Clouds
Autorzy:
Jakóbik, A.
Grzonka, D.
Kołodziej, J.
Chis, A. E.
González-Vélez, H.
Powiązania:
https://bibliotekanauki.pl/articles/309207.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
batch scheduling
cloud computing
energy efficient
grids
power consumption
resource allocation
Opis:
This paper presents an overview of techniques developed to improve energy efficiency of grid and cloud computing. Power consumption models and energy usage proles are presented together with energy efficiency measuring methods. Modeling of computing dynamics is discussed from the viewpoint of system identication theory, indicating basic experiment design problems and challenges. Novel approaches to cluster and network-wide energy usage optimization are surveyed, including multi-level power and software control systems, energy-aware task scheduling, resource allocation algorithms and frameworks for backbone networks management. Software-development techniques and tools are also presented as a new promising way to reduce power consumption at the computing node level. Finally, energy-aware control mechanisms are presented. In addition, this paper introduces the example of batch scheduler based on ETC matrix approach.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 1; 56-64
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast algorithms for calculations of viscous incompressible flows using the Velocity Correction Method
Autorzy:
Kosma, Z.
Motyl, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/1943235.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska
Tematy:
Navier-Stokes equation
artificial compressibility
method of lines
two grids method
Opis:
An artificial compressibility method is designed to simulate stationary two-and threedimensional motions of a viscous incompressible fluid. A standard method of lines approach is applied in this contribution. A partial differential equation system is discretized in space by secondorder finite-difference schemes on uniform computational grids, and the time-variable is preserved as continuous. Initial value problems for systems of ordinary differential equations for pressure and velocity components are computed using the Galerkin-Runge-Kutta method of third order. Some test calculations for laminar flows in square, cubic, triangular and semicircular cavities with one uniform moving wall and double bent channels are reported.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 289-301
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efektywność zarządzania energią w sieciach elektroenergetycznych typu smart grid - możliwości badawcze laboratorium LINTE^2
Energy management in smart grids - research potential of laboratory LINTE^2
Autorzy:
Augusiak, A.
Pokoński, R.
Powiązania:
https://bibliotekanauki.pl/articles/268689.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
sieci smart grid
laboratorium LINTE^2
smart grids
laboratory LINTE^2
Opis:
W związku z planowanym począwszy od 2016 r. wycofywaniem przestarzałych bloków w polskich elektrowniach, generacja mocy i energii elektrycznej w Polsce będzie maleć zmniejszając dostępne rezerwy. Jednym z kierunków mającym na celu poprawę bezpieczeństwa elektroenergetycznego kraju w takiej sytuacji może stać się między innymi rozwój technologii sieci elektroenergetycznych typu Smart Grid i efektywne zarządzanie energią elektryczną w takich sieciach. Wyzwania stojące przed polską elektroenergetyką w związku z wdrażaniem całkowicie nowych rozwiązań technicznych i organizacyjnych będą wymagały wsparcia ze strony uczelni i jednostek naukowych. Jednym z takich przedsięwzięć, ukierunkowanym na wsparcie rozwoju sieci Smart Grid, jest stworzenie na Wydziale Elektrotechniki i Automatyki Politechniki Gdańskiej ultranowoczesnego obiektu badawczego - Laboratorium Innowacyjnych Technologii Elektroenergetycznych i Integracji Odnawialnych Źródeł Energii LINTE^2.
In 2016, a withdrawal of obsolete units from Polish power plants will be started. Consequently, power generation will decrease and available reserves will be reduced. Development of electricity networks called Smart Grid and effective management of electrical energy in such networks may be a way out to improve the country's power security in such a situation. The challenges facing the Polish power sector in implementing a completely new technical solutions will require support from universities and research units. One of these projects, aimed at supporting the development of Smart Grid is the creation of Laboratory LINTE^2 at the Department of Electrical and Control Engineering of Technical University of Gdansk.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2012, 31; 185-188
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast algorithms for calculations of viscous incompressible flows using the artificial compressibility method
Autorzy:
Kosma, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1943234.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska
Tematy:
Navier-Stokes equation
velocity correction method
method of lines
two grids method
Opis:
The velocity correction method is designed to simulate stationary and non-stationary, two- and three-dimensional motions of a viscous incompressible fluid. The basic assumption of this method consists in splitting the velocity and the pressure fields and calculations are performed in two steps. In the first step, a tentative velocity field is determined by simplified equations for momentum conservation. In the second step the Neumann problem for the Poisson equations is solved to obtain the computational pressure, and the velocity components are corrected. A standard method of lines approach and the two grids method are applied in this contribution. Some test calculations for laminar and transitional flows in square and cubic cavities with one moving wall as well as in a backward-facing step are reported.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 273-287
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimized grid structures for the characteristic diagram based estimation of thermo-elastic tool center point displacements in machine tools
Autorzy:
Putz, M.
Ihlenfeldt, S.
Naumann, C.
Glänzel, J.
Powiązania:
https://bibliotekanauki.pl/articles/100061.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
characteristic diagram
adaptive structured grids
thermoelastic deformation
grid optimization
thermal error estimation
Opis:
It is a well-known problem of milling machines, that waste heat from motors, friction effects on guides and also the milling process itself greatly affect the positioning accuracy and thus the production quality. An economic and energy-efficient method of correcting this thermo-elastic positioning error is to gather sensor data from the machine tool and the process and to use that information to predict and correct the resulting tool center point displacement using high dimensional characteristic diagrams. The size of these characteristic diagrams depends on the number of input variables (sensors) and the fineness of the discretization of the grid. While the number of sensors can usually not be reduced without affecting the quality of the prediction, it is often possible to minimize the size of characteristic diagrams through the use of adaptive grid refinement. This ensures that the finest grid sections correspond with the load cases that have the largest local gradients. Through such adaptive refinement, it is possible to reduce storage capacity and computation time without significant loss of precision. The aim of this article is to examine, test and compare different methods of adaptive grid refinement. For this, simulation data from a machine tool is used.
Źródło:
Journal of Machine Engineering; 2017, 17, 3; 36-50
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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