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    Wyświetlanie 1-6 z 6
    Tytuł:
    Steganography usage to control multimedia stream
    Autorzy:
    Koziel, G
    Powiązania:
    https://bibliotekanauki.pl/articles/102993.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    steganography
    multimedia streams
    player
    Opis:
    In the paper, a proposal of new application for steganography is presented. It is possible to use steganographic techniques to control multimedia stream playback. Special control markers can be included in the sound signal and the player can detect markers and modify the playback parameters according to the hidden instructions. This solution allows for remembering user preferences within the audio track as well as allowing for preparation of various versions of the same content at the production level.
    Źródło:
    Advances in Science and Technology. Research Journal; 2014, 8, 21; 5-8
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and design of role engineering in development of access control for dynamic information systems
    Autorzy:
    Poniszewska-Marańda, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200307.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    access control of information systems
    access control models
    role engineering
    usage control
    Opis:
    Nowadays, the growth and complexity of functionalities of current information systems, especially dynamic, distributed and heterogeneous information systems, makes the design and creation of such systems a difficult task and at the same time, strategic for businesses. A very important stage of data protection in an information system is the creation of a high level model, independent of the software, satisfying the needs of system protection and security. The process of role engineering, i.e. the identification of roles and setting up in an organization is a complex task. The paper presents the modeling and design stages in the process of role engineering in the aspect of security schema development for information systems, in particular for dynamic, distributed information systems, based on the role concept and the usage concept. Such a schema is created first of all during the design phase of a system. Two actors should cooperate with each other in this creation process, the application developer and the security administrator, to determine the minimal set of user’s roles in agreement with the security constraints that guarantee the global security coherence of the system.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 569-579
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Switched reluctance motor drive control algorithms with single line position feedback signal usage and custom phase locked loop microcontroller implementation
    Autorzy:
    Fabianski, B
    Powiązania:
    https://bibliotekanauki.pl/articles/97676.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    switched reluctance motor
    SRM
    electric motor
    Opis:
    There was presented a frequency multiplication of a single, binary rotor position feedback signal implementation in the article. This technique was necessary to achieve wide-speed control range and improved dynamics. In the beginning a basics of the switched reluctance motors construction were described as the control system challenges were. A nature of the reduced up to one position feedback signal interface line was shown as the reference for phase locked loop system. The problem of low resolution and asymmetrical shape of the mechanical position sensor was described with its solving by embedded system optimized SPLL loop usage. There were appropriate theory dependencies introduced for phase locked loop system as confirming experimental results were shown. In the summary, conclusions were made and the further research steps were proposed. Additionally, custom made drive system for switched reluctance motor and the motor as the control object itself were introduced.
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 171-180
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Usage of Wind Farms in Voltage and Reactive Power Control Based on the example of Dunowo Substation
    Wykorzystanie farm wiatrowych do regulacji napięcia i mocy biernej na przykładzie węzła Dunowo
    Autorzy:
    Kołodziej, D.
    Klucznik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/396918.pdf
    Data publikacji:
    2014
    Wydawca:
    ENERGA
    Tematy:
    voltage control
    reactive power control
    wind farms
    ARST
    URST
    regulacja napięcia
    regulacja mocy biernej
    farmy wiatrowe
    Opis:
    The article describes a control system designed at the Institute of Power Engineering Gdańsk Division, which has been applied in Dunowo substation and nearby wind farms. Control systems use wind farms in the process of voltage and reactive power control. The device structure, rules of control and requirements described in the Instruction of Transmission System Operation and Maintenance (grid code) released by Polskie Sieci Elektroenergetyczne Operator SA the Transmission System Operator in Poland are presented.
    W artykule przedstawiono opracowany i zrealizowany przez Instytut Energetyki system regulacji napięć i mocy biernych dla węzła Dunowo, obejmujący stację elektroenergetyczną najwyższych napięć oraz dwie spośród wielu farm wiatrowych. Zaprezentowano aktualne wymagania OSP dotyczące regulacji napięcia z wykorzystaniem farm wiatrowych. Przedstawiono budowę i strukturę systemu, reguły działania jego składników, a także zasady koordynacji regulacji transformatorowej w stacji najwyższych napięć i generatorowej w farmach wiatrowych.
    Źródło:
    Acta Energetica; 2014, 1; 59-71
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Usage of Human Reliability Quantification Methods
    Autorzy:
    Grozdanovic, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/90933.pdf
    Data publikacji:
    2005
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    human error
    expert method
    operator’s reliability
    control center
    kontrola bezpieczeństwa pracy
    ochrona
    wypadki przy pracy
    błąd człowieka
    ochrona przed wypadkami
    Opis:
    Human reliability quantification (HRQ) methods are becoming increasingly important in risk and accident assessment in systems these terms are usually related to (hi-tech industrial systems, including nuclear and chemical plants). These methods began to intensively develop after numerous accidents caused by human error or inadequate activity of people who controlled and managed complex technological processes. For already existing systems, but also for new ones, it is important to assess the possibility of an accident. Determination of possible preventive activities, which include the influence of human error on the safety of a system, is also required. These are the main goals of the HRQ method. Using Absolute Probability Judgment (APJ) and Success Likelihood Index Methods (SLIM) HRQ techniques in control and management centers in electro-power systems in Belgrade and railway traffic in Nis (both in Serbia and Montenegro) are shown in this paper.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2005, 11, 2; 153-159
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prospects of the karst-speleological national park “Podillia Speleoregion” establishment and operation
    Autorzy:
    Khovalko, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1201803.pdf
    Data publikacji:
    2016-12-07
    Wydawca:
    Uniwersytet Gdański. Instytut Geografii
    Tematy:
    karst caves
    national park „Podillia Speleoregion”
    tourist recreational zonation
    tourist recreational caves usage
    improvement of organizational and administrative control
    Opis:
    The article analyses the present speleological resources on the territory of Ukraine. Within the boundaries of Podilllia speleoregion zonation has been performed in order to improve the organizational and administrative control of its tourist recreational reclamation. The relevance of Podillia speleoregion establishnment in the structure of national park has been proposed as to adjust and to monitor the whole recreational activity on its territory. The purpose of such park establishment and main dimensions of its activity have been specified. Implementation of proposed ecologically directed actions will allow to support ecological survival of caves upon the controlled intensity of recreational tourist flows.
    Źródło:
    Journal of Geography, Politics and Society; 2016, 6, 4; 45-51
    2084-0497
    2451-2249
    Pojawia się w:
    Journal of Geography, Politics and Society
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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