Overview: Comprehensive update of all kinds of vacation models. Moreover, it‘s the first time G1/M/1 multi-server vacation models, both continuous and discrete, and the optimization and control issues are prese.A classical queueing model consists of three parts - arrival process, service process, and queue discipline. However, a vacation queueing model has an additional part - the vacation process which is governed by a vacation policy - that can be characterized by three aspects: 1) vacation start-up rule; 2) vacation termination rule, and 3) vacation duration distribution. Hence, vacation qu
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