CCL

Összesen 4 találat.
#/oldal:
Részletezés:
Rendezés:

1.

001-es BibID:BIBFORM086798
Első szerző:Kuki Attila (informatikus, matematikus)
Cím:Numerical Analysis of Non-Reliable Retrial Queueing Systems with Collision and Blocking of Customers / A. Kuki, J. Sztrik, T. Bérczes, Á. Tóth, D. Efrosinin
Dátum:2020
ISSN:1072-3374 1573-8795
Megjegyzések:The aim of the investigation is a closed retrial queueing system with a finite source. The server can be reached from the source (primary request) or from the orbit (secondary request). If an incoming (primary or secondary) job finds the server busy, two modes are distinguished: the job is transferred to the orbit (no collision) or the job under service is interrupted and both of them are transferred to the orbit (collision). Requests in the orbit can retry reaching the server after a random waiting time. The nonreliable case when the server is subject to breakdown is also investigated. In case of breakdown, when the server is under repair, also two cases can be investigated. For the first, primary calls from the source can reach the system, and they will be sent to the orbit. For the second, the source is blocked, so primary customers are not able to step into the system. This paper focuses on the unreliable system with collision and blocking of parameters. These types of systems can be solved by numerical, asymptotical, and simulation methods. Our goal is to provide a new approach to the algorithmic solution for calculating the steady-state probabilities of the system. Using these quantities the main performance characteristics (utilization of the server, response time, etc.) can be calculated. Examples illustrate the effect of different parameters on the distribution of requests in the system.
Tárgyszavak:Műszaki tudományok Informatikai tudományok konferenciacikk
folyóiratcikk
Megjelenés:Journal of Mathematical Sciences. - 248 : 1 (2020), p. 1-13. -
További szerzők:Sztrik János (1953-) (informatikus, matematikus) Bérczes Tamás (1975-) (informatikus) Tóth Ádám (1990-) (mérnökinformatikus) Efrosinin, Dmitry
Pályázati támogatás:2017-2.2.4-TeT-AT-2017-00010
egyéb
EFOP-3.6.3-VEKOP-16-2017-00002
EFOP
Internet cím:Szerző által megadott URL
Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

2.

001-es BibID:BIBFORM077594
Első szerző:Kuki Attila (informatikus, matematikus)
Cím:Numerical Analysis of Retrial Queueing Systems with Conflict of Customers and an Unreliable Server / A. Kuki, T. Bérczes, J. Sztrik, A. Kvach
Dátum:2019
ISSN:1072-3374 1573-8795
Megjegyzések:In this paper a closed retrial queueing system is considered with a finite number of customers. If an arriving (primary or secondary) request finds the server busy, two modes are possible: the job is transferred to the orbit (no conflict) or the job under service is interrupted and both of them are transferred to the orbit (conflict). Jobs in the orbit can retry reaching the server after a random time. The unreliable case where the server is subject to breakdown is also investigated. These types of systems can be solved by numerical, asymptotical, and simulation methods. The novelty of the investigations is that it provides a new approach to an algorithmic solution for calculating the steady-state probabilities of the system. With the help of these probabilities the main performance measures can be computed. Several sample examples illustrate the effect of different parameters on the distribution on requests in the system.
Tárgyszavak:Műszaki tudományok Informatikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal Of Mathematical Sciences. - 237 : 5 (2019), p. 673-683. -
További szerzők:Bérczes Tamás (1975-) (informatikus) Sztrik János (1953-) (informatikus, matematikus) Kvach, Anna
Pályázati támogatás:EFOP-3.6.1-16-2016-00022
EFOP
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Szerző által megadott URL
Borító:

3.

001-es BibID:BIBFORM084211
Első szerző:Tóth Ádám (mérnökinformatikus)
Cím:The Simulation of Finite-Source Retrial Queueing Systems with Collisions and Blocking / Á. Tóth, T. Bérczes, J. Sztrik, A. Kuki, W. Schreiner
Dátum:2020
ISSN:1072-3374 1573-8795
Megjegyzések:This paper investigates, using a simulation program, a retrial queuing system with a single server which is subject to random breakdowns. The number of sources of calls is finite, and collisions can take place. We assume that the failure of the server blocks the system's operation such that newly arriving customers cannot enter the system, contrary to an earlier paper where the failure does not affect the arrivals. All the random variables included in the model construction are assumed to be independent of each other, and all times are exponentially distributed except for the service time, which is gamma distributed. The novelty of this analysis is the inspection of the blocking effect on the performance measures using different distributions. Various figures represent the impact of the squared coefficient of the variation of the service time on the main performance measures such as the mean and variance of the number of customers in the system, the mean and variance of the response time, the mean and variance of the time a customer spends in the service, and the mean and variance of the sojourn time in the orbit.
Tárgyszavak:Műszaki tudományok Informatikai tudományok konferenciacikk
folyóiratcikk
Megjelenés:Journal of Mathematical Sciences. - 246 : 4 (2020), p. 548-559. -
További szerzők:Bérczes Tamás (1975-) (informatikus) Sztrik János (1953-) (informatikus, matematikus) Kuki Attila (1964-) (informatikus, matematikus) Schreiner, Wolfgang
Pályázati támogatás:2017-2.2.4-TeT-AT-2017-00010
egyéb
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Szerző által megadott URL
Borító:

4.

001-es BibID:BIBFORM077598
Első szerző:Tóth Ádám (mérnökinformatikus)
Cím:Comparison of Two Operation Modes of Finite-Source Retrial Queueing Systems with Collisions and a Non-Reliable Server by Using Simulation / Á. Tóth, T. Bérczes, J. Sztrik, A. Kuki
Dátum:2019
ISSN:1072-3374 1573-8795
Megjegyzések:In this paper a finite-source retrial queuing system with collision of the customers is investigated by means of computer simulation. The server is not reliable; it is subjected to breakdowns, and the repairs depend on whether the state of the server is idle. The random variables used in the model are jointly independent and are exponential and gamma distributed. Two operation modes are considered in the case of busy breakdown. The novelty of the investigation is a comparison of the performance measures of these modes, and estimations obtained by the simulation are graphically illustrated showing the influence of the difference of the working modes on the performance measures such as mean and variance of the response time, mean and variance of the number of customers in the system, mean and variance of the sojourn time in the orbit, mean and variance of time time a customer spent in service.
Tárgyszavak:Műszaki tudományok Informatikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Journal Of Mathematical Sciences. - 237 : 6 (2019), p. 846-857. -
További szerzők:Bérczes Tamás (1975-) (informatikus) Sztrik János (1953-) (informatikus, matematikus) Kuki Attila (1964-) (informatikus, matematikus)
Pályázati támogatás:EFOP-3.6.1-16-2016-00022
EFOP
EFOP-3.6.2-16-2017-00015
EFOP
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Szerző által megadott URL
Borító:
Rekordok letöltése1