Abstract
In this paper, we study a tandem queue with retrials where the queue experiences disasters. The probability of system failure depends on the strength of equipment, which makes servers idle and causes the removal of all customers in queues and service areas at once. The customers in the queue are forced to orbit in a retrial queue during the system failure where they decide whether or not to come back to the system. Reducing the disaster arrival rate (the probability of system failure) by employing more servers and reducing the number of lost customers is very costly. Moreover, it is important to service the customers with no interruption and reduce the time in system. The developed scenarios are compared in five dimensions including time in system, cost of lost customer, operator cost, the number of uninterrupted service customers and cost of reducing disaster arrival rate (or empowering system cost). The scenarios are modeled by computer simulation. Then, the optimal scenario is chosen using data envelopment analysis. The optimal scenario maximizes system efficiency in terms of disaster arrival rate, cost of lost customers and the number of satisfied customers. In the main problem, the disasters arrive at the system according to Poisson process; the effect of changing the distribution function of disaster arrival has been investigated finally. We are among the first ones to study and optimize G/G/K tandem queuing systems with system failures and retrial phenomena in interactive voice response systems.
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Funding was provided by University of Tehran (Grant No. 8106013/1/21).
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A. Azadeh: Deceased.
Appendix: Visual SLAM network
Appendix: Visual SLAM network
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Azadeh, A., Naghavi lhoseiny, M.S. & Salehi, V. Optimum alternatives of tandem G/G/K queues with disaster customers and retrial phenomenon: interactive voice response systems. Telecommun Syst 68, 535–562 (2018). https://doi.org/10.1007/s11235-017-0397-x
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DOI: https://doi.org/10.1007/s11235-017-0397-x