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Operations Management: Processes and Supply Chains, 12th Edition by Larry P. Ritzman, Manoj K. Malhotra, Lee J. Krajewski

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Waiting Lines and Simulation

For each of the problems we analyzed with the waiting-line models, the arrivals had a Poisson distribution (or exponential interarrival times), the service times had an exponential distribution, the service facilities had a simple arrangement, the waiting line was unlimited, and the priority discipline was first-come, first-served. Waiting-line theory has been used to develop other models in which these criteria are not met, but these models are complex. For example, POM for Windows includes a finite system-size model in which limits can be placed on the size of the system (waiting line and server capacity). It also has several models that relax assumptions on the service time distribution. Nonetheless, many times ...

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