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Wyszukujesz frazę "inhomogeneous" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Ergodicity and perturbation bounds for inhomogeneous birth and death processes with additional transitions from and to the origin
Autorzy:
Zeifman, A.
Korotysheva, A.
Satin, Y.
Korolev, V.
Shorgin, S.
Razumchik, R.
Powiązania:
https://bibliotekanauki.pl/articles/331214.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
inhomogeneous birth process
inhomogeneous death process
ergodicity bound
perturbation bound
Opis:
Service life of many real-life systems cannot be considered infinite, and thus the systems will be eventually stopped or will break down. Some of them may be re-launched after possible maintenance under likely new initial conditions. In such systems, which are often modelled by birth and death processes, the assumption of stationarity may be too strong and performance characteristics obtained under this assumption may not make much sense. In such circumstances, time-dependent analysis is more meaningful. In this paper, transient analysis of one class of Markov processes defined on non-negative integers, specifically, inhomogeneous birth and death processes allowing special transitions from and to the origin, is carried out. Whenever the process is at the origin, transition can occur to any state, not necessarily a neighbouring one. Being in any other state, besides ordinary transitions to neighbouring states, a transition to the origin can occur. All possible transition intensities are assumed to be non-random functions of time and may depend (except for transition to the origin) on the process state. To the best of our knowledge, first ergodicity and perturbation bounds for this class of processes are obtained. Extensive numerical results are also provided.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 4; 787-802
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface waves in non-homogeneous, general magnetothermo, viscoelastic media of higher order
Autorzy:
Sethi, M.
Gupta, K. C.
Rani, M.
Powiązania:
https://bibliotekanauki.pl/articles/955273.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
fale powierzchniowe
lepkość
lepkosprężystość
inhomogeneous media
variable density
surface waves
viscosity
Opis:
The aim of the present paper is to investigate surface waves in a non-homogeneous, isotropic, visco-elastic solid medium of n-th order including the time rate of strain. The theory of generalised surface waves has firstly been developed and then it has been employed to investigate particular cases of waves, viz., Stoneley, Rayleigh and Love type. The wave velocity equations have been obtained for different cases and are in well agreement with the corresponding classical result, when the effects of viscosity, temperature, magnetism as well as nonhomogeneity of the material medium are ignored.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1221-1236
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bounds on the rate of convergence for one class of inhomogeneous Markovian queueing models with possible batch arrivals and services
Autorzy:
Zeifman, A.
Razumchik, R.
Satin, Y.
Kiseleva, K.
Korotysheva, A.
Korolev, V.
Powiązania:
https://bibliotekanauki.pl/articles/330534.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
inhomogeneous birth process
inhomogeneous death process
weak ergodicity
rate of convergence
sharp bounds
logarithmic norm
forward Kolmogorov system
proces narodzin
proces śmierci
stopień konwergencji
norma logarytmiczna
system Kołmogorowa
Opis:
In this paper we present a method for the computation of convergence bounds for four classes of multiserver queueing systems, described by inhomogeneous Markov chains. Specifically, we consider an inhomogeneous M/M/S queueing system with possible state-dependent arrival and service intensities, and additionally possible batch arrivals and batch service. A unified approach based on a logarithmic norm of linear operators for obtaining sharp upper and lower bounds on the rate of convergence and corresponding sharp perturbation bounds is described. As a side effect, we show, by virtue of numerical examples, that the approach based on a logarithmic norm can also be used to approximate limiting characteristics (the idle probability and the mean number of customers in the system) of the systems considered with a given approximation error.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 1; 141-154
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On three methods for bounding the rate of convergence for some continuous-time Markov chains
Autorzy:
Zeifman, Alexander
Satin, Yacov
Kryukova, Anastasia
Razumchik, Rostislav
Kiseleva, Ksenia
Shilova, Galina
Powiązania:
https://bibliotekanauki.pl/articles/329966.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
inhomogeneous continuous time Markov chains
weak ergodicity
Lyapunov function
differential inequalities
forward Kolmogorov system
łańcuchy Markowa z czasem ciągłym
funkcja Lapunowa
nierówność różniczkowa
system Kołmogorowa
Opis:
Consideration is given to three different analytical methods for the computation of upper bounds for the rate of convergence to the limiting regime of one specific class of (in)homogeneous continuous-time Markov chains. This class is particularly well suited to describe evolutions of the total number of customers in (in)homogeneous M/M/S queueing systems with possibly state-dependent arrival and service intensities, batch arrivals and services. One of the methods is based on the logarithmic norm of a linear operator function; the other two rely on Lyapunov functions and differential inequalities, respectively. Less restrictive conditions (compared with those known from the literature) under which the methods are applicable are being formulated. Two numerical examples are given. It is also shown that, for homogeneous birth-death Markov processes defined on a finite state space with all transition rates being positive, all methods yield the same sharp upper bound.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 2; 251-266
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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