Ch18 - CHAPTER 18 MANAGEMENT OF WAITING LINES KEY IDEAS 1....

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CHAPTER 18 MANAGEMENT OF WAITING LINES KEY IDEAS 1. Waiting Lines. Waiting lines are an important consideration in capacity planning. Waiting lines tie up additional resources (waiting space, time, etc.); they decrease the level of customer service: and they require additional capacity to reduce them. 2. Cause of Waiting Lines. Waiting lines occur whenever demand for service exceeds capacity (supply). Even in systems that are underloaded, waiting lines tend to form if arrival and service patterns are highly variable because the variability creates temporary imbalances of supply and demand. 3. Poisson Distributed Arrivals. All of the waiting line models presented in the chapter (except the constant service time model) assume, or require, that the arrival rate can be described by a Poisson distribution and that the service time can be described by a negative exponential distribution. Equivalently, we can say that the arrival and service rates must be Poisson, and the interarrival time and the service time must be exponential. In practice, one would check for this using a statistical Chi Square test: for problems provided here and in the textbook, assume that these distributions hold. Note that if these assumptions are not met, alternate approaches (e.g., intuition, simulation, other models) should be considered. 4. Waiting Line Models. Much can be learned about the behavior of waiting lines by modeling them. A wide variety of models are presented in the text, different models pertain to different system characteristics. 5.
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This note was uploaded on 11/19/2011 for the course COB 0104-722 taught by Professor Wollan during the Fall '10 term at RIT.

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Ch18 - CHAPTER 18 MANAGEMENT OF WAITING LINES KEY IDEAS 1....

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