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    Wyświetlanie 1-3 z 3
    Tytuł:
    A framework for additional server activation
    Autorzy:
    Savić, G.
    Makajić-Nikolić, D.
    Vujošević, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/409328.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    queue
    Additional server
    Activation rule
    Petri nets
    data envelopment analysis
    Opis:
    This paper assesses the performance of the queuing system with several fixed and additional multitask servers. The additional server serves customers in the case of necessity to avoid congestion and decrease the number of impatient customers. An additional server will be activated whenever the length of queue becomes greater than or equal to user defined size i.e. threshold value. Also, this server will be switched off when the length of queue falls below user defined size, but ongoing service has to be finished.The main issue is to decide when and how long the additional server would work with customers. This paper proposes a methodology to choose the best activation rule for the work of an additional server, based on the performance evaluation of queuing system. The Petri nets (PN) simulation is used to calculate the performance measures. Relative efficiency evaluation of different activation rules is carried out by data envelopment analysis (DEA). The methodology is applied on real-life data collected from a postal office.
    Źródło:
    Research in Logistics & Production; 2012, 2, 4; 387-397
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and Operational Planning of Power Systems by Comparing Scenarios during Multi-Objective Optimization
    Autorzy:
    Stefanov, P.
    Savić, A.
    Dobrić, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401944.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.80.H-
    Opis:
    Multi-objective optimization in development and operational planning of power systems becomes crucially important for system designers or operators. In addition, appropriate procedures increasingly involve comparison of scenarios, each with variables that have to be neither dimensionally nor qualitatively comparable. Selecting the best solution is usually performed posteriorly by comparing the results of different scenarios. In order to eliminate unnecessary calculations during the optimization, especially in the case of large number of scenarios, it is useful to eliminate the scenarios with bad indicators. This process can significantly reduce the computational time. It results in a timely elimination of all inferior scenarios, thus simplifying the decision-making. This paper analyses the methods and the efficiency of comparison of different scenarios being simultaneously processed using NSGA-II and MOPSO optimization procedures. The proposed procedures are discussed in the example of selecting the type, the size and the location of FACTS in transmission networks. Different scenarios consider the common types of these devices, wherein the number of devices depends on the system. The paper proposes the reduction of the optimization procedures. Having no significant influence on the final set of optimal solutions, the proposed modifications are significant and applicable.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-138-B-141
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Holographic Fabrication of Periodic Microstructures in Dichromated Pullulan
    Autorzy:
    Savić-Šević, S.
    Pantelić, D.
    Gajić, R.
    Isić, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047886.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.40.-i
    42.70.Ln
    42.70.Qs
    Opis:
    Photonic crystal structures are fabricated in dichromated pullulan by the holographic technique. Relief structures of photonic lattices with rectangular, rhombic, and hexagonal arrays of peaks and holes are obtained. The structures have periodicities of the order 1.1μm and depth of about 50 nm.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1079-1082
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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