Tsung-Yin Wang

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This paper studies maximum likelihood estimates as well as confidence intervals of an M/M/R queue with heterogeneous servers under steady-state conditions. We derive the maximum likelihood estimates of the mean arrival rate and the three unequal mean service rates for an M/M/3 queue with heterogeneous servers, and then extend the results to an M/M/R queue(More)
This paper investigates a machine repair problem with homogeneous machines and standbys available, in which multiple technicians are responsible for supervising these machines and operate a (R, V, K) synchronous vacation policy. With such a policy, if any V idle technicians exist in the system, these V (V < R) technicians would take a synchronous vacation.(More)
This paper examines a discrete-time Geo/Geo/1 queue, in which the server operates a randomized vacation policy with at most J vacations. After all messages are served in the queue, the server leaves for a vacation immediately. If there are some messages waiting in the queue upon the server returning from a vacation, it serves the waiting messages(More)
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