Geodesic
Multi-server Markovian heterogeneous arrivals queue with two kinds of working vacations and impatient customers
Yugoslav journal of operations research, Tome 33 (2023) no. 4, p. 643 .

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This paper deals with multi-server queueing system with two kinds of Working Vacations (WVs) and impatient customers. A random timer is started whenever a customer comes into the system. The customer may abandon the system if the service is not completed before the impatience timer expires. Each time after serving all the customers, the system becomes empty and then the server begins 1st kind of vacation. On returning from 1st kind of WV, the server begins 2nd kind of WV whenever a system has no customers. When the server comes back from either 1st kind or 2nd kind of WV, if there is at least one customer in the system, the server switches to busy period. The steady state probabilities have been derived using the Probability Generating Functions (PGFs) method. Various measures of performance are presented and numerical illustrations are also provided.
Classification : 60K25, 60K30, 90B22
Keywords: Busy state, steady state, impatient customer, c-server, performance measures 
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     author = {R S Yohapriyadharsini and V Suvitha},
     title = {Multi-server {Markovian} heterogeneous arrivals queue with two kinds of working vacations and impatient customers},
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R S Yohapriyadharsini; V Suvitha. Multi-server Markovian heterogeneous arrivals queue with two kinds of working vacations and impatient customers. Yugoslav journal of operations research, Tome 33 (2023) no. 4, p. 643 . http://geodesic.mathdoc.fr/item/YJOR_2023_33_4_a6/