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MMPP/M/C queue with congestion-based staffing policy and applications in operations of steel industry

Journal of Iron and Steel Research International 2019年第7期26卷 659-668页

作者： Yan-he Jia Li-xin Tang Zhe George Zhang Xiao-feng Chen Liaoning Key Laboratory of Manufacturing System and Logistics Institute of Industrial and Systems Engineering Northeastern University Shenyang 110819 Liaoning China Beedie School of Business Simon Fraser University Burnaby BC V5A 1S6 Canada Department of Decision Sciences Western Washington University Bellingham WA 98225 USA

A queueing model of the Markov-modulated Poisson process (MMPP) with thresholds was investigated. The customer arrival with various arrival rates in the model was viewed as the MMPP. In contrast to the Poisson, s arrival process, the MMPP can better describe the situation that the arrival rate changes with changing conditions;therefore, the model fits better with reality. The threshold conversion was added to the model based on the general MMPP/M/C model. When the number of customers in the system exceeds a threshold, all servers work to serve;when the number of customers in the system is less than another threshold, some servers are shut down. This is the congestion-based staffing policy with two thresholds. Specifically, the problems in the slab stocking stage of slab production at the Iron and Steel Complex in China were analysed. In the slab production process, because the rate of the upstream steelmaking is not constant, the rate of slab reaching the slab yard is uncertain. The crane service is used to store slabs in a warehouse. Because the slab arrival rate varies, different numbers of cranes in service need to be optimized for cost control. Thus, MMPP was used to describe slab arrival with varied arrival rates. Therefore, an MMPP/M/C queue with thresholds was used to analyse and solve the practical problems, and the optimal number of service cranes was obtained to minimize the cost of slab stocking.

关键词： Markov-modulated Poisson process Matrix geometry congestion-based staffing policy Threshold conversion Slab Crane

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