Sojourn time approximations in queueing networks with feedback

Gijsen, B.M.M.; Mei, R.D. van der; Engelberts, P.; Berg, J.L. van den; Wingerden, K. M. C. van

doi:10.1016/j.peva.2005.08.002

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…The end user sends the request to the server-side script and the server sends the request to different providers to give the requested service. (Gijsen et al, 2006) Maximum and minimum of the total virtual waiting time of a customer in open queues in M/G/1 and GI/M/1 service systems can be found. The method of strong approximations for several different queuing processes can be used to find maximum and minimum parameters in queues (Minkevi£ius, 2009).…”

Section: Tandem Queuesmentioning

confidence: 96%

Applications of queues in hospitals in Istanbul

Aslan¹

2015

COES&RJ-JSS

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Queues are one of the worst problem in hospitals in almost all World. Patients have to wait long time even to get a small operation in hospitals in Turkey. Turkey healthcare system has recently improved, but it is still not at expected level. The quantity oriented healthcare services meaning caring more patients are not good at meeting quality parameters of healthcare services. The private sector partly subsidized by governments is more profit oriented and its share has been increasing. The quality of care can be increased by low waiting and better performance of doctors. In this study, the queuing theory applications are applied two big hospitals in Istanbul during 2013-2014 years by measuring waiting time and services time and systems during different times in six months. It is found that the performance of doctors are not at expected level when total utilization is considered. Waiting long time in queues is ignored by hospitals and these long queues create high stress over patients especially at public hospitals. Patient categorization based on appointments such as scheduled patients, checking patients, urgent patients, priority patients and new patients of day, serving different patients at district time of day, combining system of all hospitals in the same city for scheduling of surgery and other operations, decreasing waiting queues and workload on doctors can help to improve the current healthcare system.

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Section: Tandem Queuesmentioning

confidence: 96%

Applications of queues in hospitals in Istanbul

Aslan¹

2015

COES&RJ-JSS

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“…Gijsen et al [24] study sojourn times in an open queueing network with a single processor sharing node and an arbitrary number of multi-server FCFS nodes. PS-node represents the front-end application server, while multi-server FCFS nodes stand for distributed database sites.…”

Section: Granularity Of Transaction Modelingmentioning

confidence: 99%

Performance Modeling of Database Systems: a Survey

Krajewska¹

2018

JTIT

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This paper presents a systematic survey of the existing database system performance evaluation models based on the queueing theory. The continuous evolution of the methodologies developed is classiﬁed according to the mathematical modeling language used. This survey covers formal models – from queueing systems and queueing networks to queueing Petri nets. Some fundamentals of the queueing system theory are presented and queueing system models are classiﬁed according to service time distribution. The paper introduces queueing networks and considers several classiﬁcation criteria applicable to such models. This survey distinguishes methodologies, which evaluate database performance at the integrated system level. Finally, queueing Petri nets are introduced, which combine modeling power of queueing networks and Petri nets. Two performance models within this formalism are investigated. We ﬁnd that an insuﬃcient amount of research eﬀort is directed into the area of NoSQL data stores. Vast majority of models developed focus on traditional relational models. These models should be adapted to evaluate performance of non-relational data stores.

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Database system performance evaluation models: A survey

Osman

Knottenbelt

2012

Performance Evaluation

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Sojourn time approximations in queueing networks with feedback

Cited by 6 publications

References 9 publications

Applications of queues in hospitals in Istanbul

Applications of queues in hospitals in Istanbul

Performance Modeling of Database Systems: a Survey

Database system performance evaluation models: A survey

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