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    Wyświetlanie 1-4 z 4
    Tytuł:
    Investigation of G-network with bypasses of queueing systems by positive customers at a non-stationary regime
    Autorzy:
    Naumenko, Victor
    Kopats, Dmitry
    Matalytski, Mikhail
    Pankov, Andrey
    Powiązania:
    https://bibliotekanauki.pl/articles/1839756.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    queuing network
    non-stationary regime
    negative customers
    bypass
    sieć kolejkowa
    negatywny klient
    pozytywny klient
    Opis:
    An open queuing network (QN) with single-line queuing systems (QS) is considered. QS are characterized by the presence of bypasses and the possibility of coming of negative customers. The network receives two independent elementary streams. The first stream is formed from the ordinary (positive) customers, while the second is composed of negative customers. Arriving of each negative customer to the system destroys exactly one positive customer in the queue, if those are contained. Negative customers do not require maintenance as the service of positive customers in the network systems is carried out in accordance with the FIFO discipline. Positive customers with a probability depending on the state of the node when they are sent to it are added to the queue, and with an additional probability, they immediately bypass it and behave in the future as served. The service in the systems is exponential, the routing of positive customers in the network is Markov, taking into account the possibility of turning the customer into a negative one after sending it to another system.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 3; 85-97
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of HM-networks with positive and negative heterogeneous requests for finding memory volume in information systems
    Autorzy:
    Matalytski, Mikhail
    Zajac, Pawel
    Kopats, Dmitry
    Powiązania:
    https://bibliotekanauki.pl/articles/1839809.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    HM-network
    information systems
    volumes of requests
    positive heterogeneous request
    negative heterogeneous request
    sieć HM
    sieć kolejkowa
    system informacyjny
    pojemność pamięci
    Opis:
    To determine the memory volume of information systems (IS), it was proposed to use a stochastic model, based on the use of a queueing network with bypasses, known as an HM-network. This model includes the servicing of heterogeneous requests along with their volumes, the ability to change the volume of such requests with their passage of time and the possibility of finding computer viruses in them, and therefore servicing requests can be interrupted at some random time. The expressions were obtained for the expected total values of the volume of requests in IS nodes.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 67-77
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of HM-networks with positive and negative heterogeneous requests for finding memory volume in information systems
    Autorzy:
    Matalytski, Mikhail
    Zajac, Pawel
    Kopats, Dmitry
    Powiązania:
    https://bibliotekanauki.pl/articles/122732.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    HM-network
    information systems
    volumes of requests
    positive heterogeneous request
    negative heterogeneous request
    sieć HM
    sieć kolejkowa
    system informacyjny
    pojemność pamięci
    Opis:
    To determine the memory volume of information systems (IS), it was proposed to use a stochastic model, based on the use of a queueing network with bypasses, known as an HM-network. This model includes the servicing of heterogeneous requests along with their volumes, the ability to change the volume of such requests with their passage of time and the possibility of finding computer viruses in them, and therefore servicing requests can be interrupted at some random time. The expressions were obtained for the expected total values of the volume of requests in IS nodes.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 67-77
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of G-networks with restart at a non-stationary mode and their application
    Autorzy:
    Matalytski, Mikhail
    Naumenko, Victor
    Kopats, Dmitry
    Powiązania:
    https://bibliotekanauki.pl/articles/122538.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    queueing network
    G-network
    positive and negative customers
    non-stationary regime
    multiple type customers
    signals
    restart
    nonstationary state probabilities
    successive approximation method
    sieć kolejkowa
    sieć G
    sygnały
    metoda aproksymacji
    aproksymacja
    teoria kolejek
    pozytywny klient
    negatywny klient
    Opis:
    This article discusses the question of restarting the script, when restart is used by many users of the information network, which can be modelled as a G-network. Negative claims simulate the crash of the script and the re-sending of the request. Investigation of an open queuing network (QN) with several types of positive customers with the phase type of distribution of their service time and one type of negative customers have been carried out. Negative customers are signals whose effect is to restart one customers in a queue. A technique is proposed for finding the probability of states. It is based on the use of a modified method of successive approximations, combined with the method of a series. The successive approximations converge with time to a stationary distribution of state probabilities, the form of which is indicated in the article, and the sequence of approximations converges to the solution of the difference-differential equations (DDE) system. The uniqueness of this solution is proved. Any successive approximation is representable in the form of a convergent power series with an infinite radius of convergence, the coefficients of which satisfy recurrence relations, which is convenient for computer calculations. A model example illustrating the finding of time-dependent probabilities of network states using the proposed technique is also presented.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 2; 41-51
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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