Operations Management: Sustainability and Supply Chain Management, Twelfth Edition
by Jay Heizer, Barry Render, Chuck Munson
Summary
Queues are an important part of the world of operations management. In this module, we describe several common queuing systems and present mathematical models for analyzing them.
The most widely used queuing models include Model A (M/M/1), the basic single-server, single-phase system with Poisson arrivals and negative exponential service times; Model B (M/M/S), the multiple-server equivalent of Model A; Model C (M/D/1), a constant-service-rate model; and Model D, a finite-population system (M/M/1 with finite source). All four models allow for Poisson arrivals; first-in, first-out service; and a single-service phase. Typical operating characteristics we examine include average time spent waiting in the queue and system, average number ...
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