Összesen 3 találat.


001-es BibID:BIBFORM071876
Első szerző:Novac, Ovidiu
Cím:Modeling RF-based sensor networks by using dual-source retrial queueing systems / Ovidiu Constantin Novac, Tamás Bérczes, Attila Kuki, Ádám Tóth, Wolfgang Schreiner
Megjegyzések:Here, we would like to study the efficiency andutilization of radio frequency (RF) transmission in wireless sensornetworks. A new dual source queueing model (with finite andinfinite numbers of sensors) is introduced in order to obtainthe most frequently studied system performance characteristics(e.g. mean response time, average number of jobs waiting fortransmission, and the utilization of the RF unit). The differenttypes of sensors form the "sources" and the RF unit formsthe "central servicing node" of this model. The elements of thesensor fields are classified according to their working purposes:The first class is the "Emergency" or "Special" class which isresponsible to notify special rare events (e.g. fire alarms). Theother class is the "Standard" class where sensors measure datafrom standard conventional events or occurrences (eg. motiondetection, wind speed, level of darkness etc). For energy efficiencyreasons the Central Unit (or Radio Frequency Unit - RFU)might switch into a reduced functioning mode. This reducedcommunication mode is for saving energy. The transmissionsare closed in this mode. Returning from the reduced mode twocases are considered and two models are created to comparetheir steady-state system performance characteristics: In the firstmodel, the RF transmission is available randomly to the sensornodes ("Non-Controlled" case). In the other case, the CentralUnit jobs which come from the Special class, can use the wirelessservice immediately ("Controlled" case).
Tárgyszavak:Műszaki tudományok Informatikai tudományok előadáskivonat
wireless sensors
performance evaluation
retrial queueing
stochastic simulation
Megjelenés:2017 14th International Conference on Engineering of Modern Electric Systems (EMES), Oradea, Romania, June 01-02, 2017. - p. 149-153. -
További szerzők:Bérczes Tamás (1975-) (informatikus) Kuki Attila (1964-) (informatikus, matematikus) Tóth Ádám (1990-) (mérnökinformatikus) Schreiner, Wolfgang
Internet cím:DOI
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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
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
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
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001-es BibID:BIBFORM072398
Első szerző:Tóth Ádám (mérnökinformatikus)
Cím:Analysis of finite-source cluster networks / Ádám Tóth, Tamás Bérczes, Attila Kuki, Béla Almási, Wolfgang Schreiner, Jinting Wang, Fang Wang
ISSN:1584-286X 1843-441X
Tárgyszavak:Műszaki tudományok Informatikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Creative Mathematics and Informatics. - 25 : 2 (2016), p. 223-235. -
További szerzők:Bérczes Tamás (1975-) (informatikus) Kuki Attila (1964-) (informatikus, matematikus) Almási Béla (1966-2015) (informatikus, matematikus) Schreiner, Wolfgang Wang, Jinting (1965-) (matematikus informatikus) Wang, Fang (1990-) (matematikus informatikus)
Pályázati támogatás:TéT 12 CN-1-2012-0009
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