A repairable queueing model with two-phase service, start-up times and retrial customers

  • Authors:
  • Ioannis Dimitriou;Christos Langaris

  • Affiliations:
  • Department of Mathematics, University of Ioannina, 45110 Ioannina, Greece;Department of Mathematics, University of Ioannina, 45110 Ioannina, Greece

  • Venue:
  • Computers and Operations Research
  • Year:
  • 2010

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Abstract

A repairable queueing model with a two-phase service in succession, provided by a single server, is investigated. Customers arrive in a single ordinary queue and after the completion of the first phase service, either proceed to the second phase or join a retrial box from where they retry, after a random amount of time and independently of the other customers in orbit, to find a position for service in the second phase. Moreover, the server is subject to breakdowns and repairs in both phases, while a start-up time is needed in order to start serving a retrial customer. When the server, upon a service or a repair completion finds no customers waiting to be served, he departs for a single vacation of an arbitrarily distributed length. The arrival process is assumed to be Poisson and all service and repair times are arbitrarily distributed. For such a system the stability conditions and steady state analysis are investigated. Numerical results are finally obtained and used to investigate system performance.