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    Wyświetlanie 1-9 z 9
    Tytuł:
    Evolutionary paths in wireless communication systems
    Autorzy:
    Michalski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/309042.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    cellular mobile radio systems
    wireless local area networks
    wireless personal networks
    wide area wireless packet data systems
    satellite-based mobile systems
    paging/messaging systems
    cordless telephones
    access points
    switches
    GPRS
    Mobile IP
    WLAN cellular integration
    Opis:
    The paper contains a review and analysis of evolutionary paths of seven most important, from network development strategy point of view, wireless communication systems, especially the WLAN operating according to the IEEE 802.11 standard. With respect to WLAN, trends related to evolution toward mobile network and self organizing network as well as toward integration of WLAN and GSM using GPRS are presented. Concerning WLAN architecture development, evolution paths toward distributed controlled network as well as centrally coordinated and controlled network are described. Moreover, analysis includes cellular mobile radio systems, wireless personal networks, wide area wireless packet data systems, satellite-based mobile systems, paging/messaging systems and cordless telephones. With respect to these systems, general evolution process and trends associated with this process are described.
    Źródło:
    Journal of Telecommunications and Information Technology; 2005, 3; 105-111
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flexible Software Design for Korean WA-DGNSS Reference Station
    Autorzy:
    Choi, W.S.
    Chhattan, S.S.
    Kye, J.E.
    Han, W.Y.
    Yun, H.
    Kee, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116770.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System (GNSS)
    Flexible Software Design
    Wide area Reference Station (WRS)
    Opis:
    In this paper, we describe the software design results of WA‐DGNSS reference station that will be constructed in Korea in the near future. Software design of the WRS (Wide area Reference Station) is carried out by applying object oriented software methodology in order to provide flexibilities: easy of model change (namely ionospheric delay model etc) and system addition (Galileo, GLONASS in addition to GPS etc). Software design results include the use case diagrams for the functions to be executed, the architecture diagram showing components and their relationships, the activity diagrams of behaviors and models among them, and class diagrams describing the attribute and operation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 75-78
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Frequency Electromagnetic Interferences Impact on Transport Security Systems Used in Wide Transport Areas
    Autorzy:
    Dziula, P.
    Pas, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/116657.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    transport security system
    low frequency
    wide transport area
    electromagnetic Interferences
    durability
    vulnerability
    transport telematics
    diagnostics of interferences source
    Opis:
    The article presents the impact of electromagnetic interferences of low frequency range, on transport security systems used in wide transport areas. Intended and unintended (stationary and mobile), electromagnetic interferences, impacting on items and components constituting transport system at wide area (seaport, railway, etc.), cause changes of its vulnerability, resistance and durability. Diagnostics of interferences sources (amplitude, frequency range, radiation characteristics, etc.), appearing within transport environment, and usage of appropriate technical solutions of systems (i.e. shielding, reliability structures), allows for safe implementation of safety surveillance of human beings, properties and communication means.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 251-258
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody badania wybranych usług dodanych w sieciach rozległych
    Test methods for selected value-added services in wide area networks
    Autorzy:
    Czech, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/305939.pdf
    Data publikacji:
    2010
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    usługi dodane
    sieci rozległe
    sieci CDN
    systemy PBM
    value added services
    wide area networks
    CDN
    PBM
    Opis:
    W publikacji przedstawiono wybrane usługi dodane wykorzystywane w sieciach rozległych, a także scharakteryzowano podstawowe typy architektur sieci, w których posiadają one zastosowanie. Omówiono również metody formalnego opisu wybranych usług dodanych na potrzeby ich badania oraz oceny jakości, a także zaprezentowano przykładowe wskaźniki liczbowe możliwe do wykorzystania dla systemów dostarczania treści. Zwrócono uwagę na techniki klasyfikacji ruchu w sieci wykorzystywane na etapie badania wybranych usług dodanych.
    In this paper selected value-added services used in wide area networks are characterized, as well as there are also discussed methods for formal description of the selected value-added services to their testing and quality evaluation. Additionally there are presented examples of numerical indicators for content delivery systems and techniques of network traffic classification, which might be used at the stage of testing selected value-added services.
    Źródło:
    Biuletyn Instytutu Systemów Informatycznych; 2010, 5; 23-30
    1508-4183
    Pojawia się w:
    Biuletyn Instytutu Systemów Informatycznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal robust stabilizer design based on UPFC for interconnected power systems considering time delay
    Autorzy:
    Koofigar, H. R.
    Isazadeh, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/140441.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    UPFC
    mixed H2 /H∞
    LMI
    wide area
    power system oscillations
    time delay
    Opis:
    A robust auxiliary wide area damping controller is proposed for a unified power flow controller (UPFC). The mixed H2 /H∞ problem with regional pole placement, resolved by linear matrix inequality (LMI), is applied for controller design. Based on modal analysis, the optimal wide area input signals for the controller are selected. The time delay of input signals, due to electrical distance from the UPFC location is taken into account in the design procedure. The proposed controller is applied to a multimachine interconnected power system from the IRAN power grid. It is shown that the both transient and dynamic stability are significantly improved despite different disturbances and loading conditions.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 3; 459-474
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical issues in frequency disturbance recorder design for wide-area monitoring
    Autorzy:
    Xu, Ch.
    Zhong, Z.
    Centeno, V.
    Conners, R.
    Liu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/262637.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    power system
    wide-area monitoring
    phasor analysis
    frequency tracking
    Opis:
    To maintain power system operation in a balanced and stable condition, the frequency deviation and the rate of frequency change information are highly desired in monitoring and protection applications of the power grid. How to obtain frequency information more accurately and efficiently has been the topic discussion for decades. PMUs (Phaser Measurement Unit) are the most widely-used devices for measuring phase angle differences and they also provide very accurate frequency information. However, the high installation cost of PMUs limits their applications for wide area control and stability analysis of power system. Thanks to commercial GPS receivers and the fast developments in Ethernet networks, an affordable wide area, quasi real-time, GPS synchronized frequency measurement is now possible. This paper introduces a portable networked Frequency Disturbance Recorder (FDR) device, which can be used at any 110V wall outlet and transmit measured frequency data remotely via the Ethernet. The practical issues and challenges of the device design and implementation are analyzed and discussed. Based on these low cost FDRs, a US-wide Frequency Network (FNET) has been implemented at Virginia Tech and some power system monitoring applications are being developed by taking fully advantage of the FDRs.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2005, 11, 1; 69-76
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resource and Task Allocation Algorithm for WAN-based Distributed Computing Environment
    Autorzy:
    Markowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226934.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    capacity and flow assignment problem
    distributed computing
    resource management
    wide area networks
    Opis:
    In the paper an approximate algorithm for optimizing of distributed computing WAN network is proposed. Distributed computing systems become the common tools in different kind of business, science and even entertainment. In order to minimize processing time of data and utilize spare resources available on remote systems, many companies and institutions decide to build and maintain own wide area networks (WAN) for ensuring reliable and secure distributed processing of data. Design of WANs in concerned with solving different optimization problems, like routing assignment, capacities of channel selection, resource (i.e. servers, management centre) allocation. Due to peculiar structure of wide area networks and nature of protocols, proper optimization methods and algorithms should be constructed for WAN-based distributed computing systems. In the paper the model of the distributed environment, built on WAN infrastructure is presented. Then, the optimization problem for routing assignment, channel capacities assignment and grid management center (data repository) allocation is formulated. Finally, an approximate algorithm is presented for formulated problem. Proposed algorithm, observations and conclusions should effect in improving of distributed computing systems design.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 2; 197-202
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transparency of web portals of rural gminas in Łódź metropolitan area
    Autorzy:
    Feltynowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/61598.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    World Wide Web portal
    Web zob.World Wide Web
    transparency
    rural area
    Lodz city
    urban area
    World Wide Web
    information technology
    communication technology
    information society
    socioeconomic development
    Opis:
    In the present world information and knowledge are important elements of the local course of every stage of the civil service. Information delivered to local community contributes to achieving a high local identity level. Development of information function in gminas is being extorted by permanent progress in the scope of the information and communication technologies (ICT). In local society, the most important way of holding information should be Internet. It is important because more and more households in rural area have opportunities to the access to the Internet. Local society can use websites erected by local governments to disseminate information about functioning and action picked up in administrative districts to local actors. Transparent websites are becoming a source of information as well as they let achieve the competitive edge above other gminas. An attempt of assessment of providing information by authorities and usefulness of this information from a socio-economic development point of view is the purpose of the paper. Building transparent and available websites for local society is the important task for local governments, because well-informed society participates in local life and in local undertaking picked up by authorities. This is important, especially in the rural gminas located in metropolitan areas which must achieve the competitive edge above other gminas. The paper shows that that the information constituting the indispensable element of social and economic processes becomes more and more universal and serves publicizing and nationalizing decision-making processes.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wide-area based on coordinated tuning of fuzzy PSS and FACTS controller in multi-machine environment
    Autorzy:
    Ebrahimian, H.
    Sheikhahmad, E. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/102172.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wide area power system
    FPSS
    FACTS
    improved honey bee mating optimization
    Opis:
    In this paper coordination of fuzzy power system stabilizer (FPSS) and flexible ac transmission systems (FACTS) have been considered in a multi-machine power system. The proposed model, has been applied for a wide-area power system. The proposed FPSS presented with local, nonlinear feedbacks, and the corresponding control synthesis conditions are given in terms of solutions to a set of linear matrix inequalities (LMIs). For this model, in fuzzy control synthesis, the new proposed control design method is based on fewer fuzzy rules and less computational burden. Also, the parameters of FACTS controller have been evaluated by improved honey bee mating optimization (IHBMO). The effectiveness of the proposed method has been applied over two case studies of single-machine infinite-bus (SMIB) and two areas four machine (TAFM) Kundur’s power system. The obtained results demonstrate the superiority of proposed strategy.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 29; 85-96
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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