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001-es BibID:BIBFORM076551
Első szerző:Efrosinin, Dmitry
Cím:Reliability Analysis of an Aging Unit with a Controllable Repair Facility Activation / Dmitry Efrosinin, Janos Sztrik, Mais Farkhadov, Natalia Stepanova
Dátum:2018
ISSN:2194-1009
Megjegyzések:The chapter utilizes the continuous-time Markov chain for modeling the processes of the gradual aging with maintenance on a finite discrete set of an intermediate failure states. The transitions occur according to the birth-and-death process, and the unit fails completely after visiting the last available state. The unit of a multiple and single use is studied. The switching of the repair facility is performed by a hysteresis control policy with two threshold levels for switching on/off the repair server. We provide the expressions for the stationary and non-stationary performance and reliability characteristics, solution of optimization problems, and sensitivity analysis of the reliability function.
ISBN:978-3-319-76034-6 978-3-319-76035-3
Tárgyszavak:Műszaki tudományok Informatikai tudományok tanulmány, értekezés
Megjelenés:Statistics and Simulation / ed. Jürgen Pilz, Dieter Rasch, Viatcheslav B. Melas, Karl Moder. - p. 403-417. -
További szerzők:Sztrik János (1953-) (informatikus, matematikus) Farkhadov, Mais Stepanova, Natalia
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2.

001-es BibID:BIBFORM070809
Első szerző:Efrosinin, Dmitry
Cím:Reliability analysis of a two-server heterogeneous unreliable queueing system with a threshold control policy / Dmitry Efrosinin, Janos Sztrik, Mais Farkhadov, Natalia Stepanova
Dátum:2017
ISSN:1865-0929
Megjegyzések:Heterogeneous servers which can differ in service speed and reliability are getting more popular in modeling of modern communication systems. For a two-server queueing system with unreliable servers the allocation of customers between the servers is performed via a threshold control policy which prescribes to use the fastest server whenever it is free and the slower one only if the number of waiting customers exceeds some threshold level depending on the state of faster server. The main task of the paper consists in reliability analysis of the proposed system including evaluation of the stationary availability and reliability function. The effects of different parameters on introduced reliability characteristics are analyzed numerically.
ISBN:978-3-319-68068-2 978-3-319-68069-9
Tárgyszavak:Műszaki tudományok Informatikai tudományok tanulmány, értekezés
Megjelenés:Information technologies and mathematical modelling : Queueing theory and applications / Eds. Alexander Dudin, Anatoly Nazarov, Alexander Kirpichnikov. - p. 13-27. -
További szerzők:Sztrik János (1953-) (informatikus, matematikus) Farkhadov, Mais Stepanova, Natalia
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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3.

001-es BibID:BIBFORM068363
Első szerző:Efrosinin, Dmitry
Cím:Reliability analysis of a controllable queueing system with two heterogeneous servers subject to failures / D. Efrosinin, J. Sztrik, M. Farkhadov
Dátum:2016
Megjegyzések:To make modern communication systems superior in performance and reliability to the previous generation systemsthey can be supplied with heterogeneous communication links. Such links can differ in availability, link datathroughputs, power consumption and reliability characteristics. To model the dynamic behaviour of the links withdifferent properties a queueing system with non-reliable heterogeneous servers can be used. While the first steps inthe performance analysis of controllable heterogeneous queueing systems have already been developed for completelyreliable servers, a missing link to an applicability of these models is reliability analysis of such queues withservers subject to failures. In this paper we use a matrix transform based method to evaluate reliability measuressuch as reliability function and mean time to the first failure for each server separately and for the total servicefacility under the fixed threshold allocation control policy. The reliability functions are obtained in terms of theLaplace transform and numerical inversion algorithm is used to get the time dependent functions. Additionally anew discrete reliability metric which can be treated as a discrete counterpart to the distribution of the time to failureis introduced. This function specifies the distribution of the number of repairs of the server until a complete failureof the service facility occurs. Some numerical examples illustrate the efficiency of the proposed algorithms.
Tárgyszavak:Műszaki tudományok Informatikai tudományok előadáskivonat
Megjelenés:European Conference On Queueing Theory 2016. Toulouse July 18 - 20, 2016. - p. 44.
További szerzők:Sztrik János (1953-) (informatikus, matematikus) Farkhadov, Mais
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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