Abstract
A wide class of closed single-channel queues is considered. The more general model involvesm +w + 1 “permanent” customers that occasionally require service. Them customers are of the first priority and the rest are of the second priority. The input rate and service of customers depend upon the total number of customers waiting for service. Such a system can also be described in terms of servicing machines processes with reserve replacement and multi-channel queues with finite waiting room. Two dual models, with and without idle periods, are treated. An explicit relation between the servicing processes of both models is derived. The semi-regenerative techniques originally developed in the author's earlier work [4] are extended and used to derive the probability distribution of the processes in equilibrium. Applications and examples are discussed.
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