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The design of cell formation of a cellular manufacturing system (CMS) is a combinatorial optimization problem. Cellular manufacturing can reduce the material handling costs and increase the efficiency of the system. Because of uncertainties in production life circle, there are many changes in demand of the products. But former cell formation methods ignore this situation. And product life cycles are...
In this paper, we consider queues with Markov modulated service processes (MMSP) whose service rates change according to an external environment that governed by Markov process. We established the M/M/C +M queueing models where servers operate in a Markov environment and customers are allowed to abandon service (+M). Randomly occurring server breakdown induces service rates change with time. We obtain...
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