SCM300 - Module 5

SCM300 - Module 5 - SCM 300 MODULE 05 Study Packet Module...

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SCM 300 – MODULE 05 Study Packet Module 05: Sell it and Service It WAITING LINES Waiting lines are something we encounter nearly everyday, and nearly everywhere we go. In this module we tried to demonstrate the different dynamics of different systems. By altering arrival rates, service rates, number of servers, ordering of customer orders, number of lines, number of systems, etc. we demonstrated how customers and servers fared. Each pays their own price and this modeling simply seeks to create an equilibrium that is acceptable to both parties. Reading Assignments: Text: MARBLE Text Reading Assignment: Pages: 212-227 212 Waiting Line – is one or more “customer” waiting for service. The customers can be people of inanimate objects such as, machines requiring maintenance, sales order waiting for shipping, or inventory items waiting to be used. A waiting line forms because of temporary imbalance between demand of service and the capacity of the system to provide the service. In most rela- life waiting line problems, the demand rate varies; that is, customers arrive at unpredictable intervals. Most often, the rate of producing the service also varies, depending on customer needs. 213 Four elements of waiting lines – 1. An input, or customer population , that generates potential customers; 2. a waiting line of customers; 3. the service facility , consisting of a person (or crew), a machine (or group of machines), or both necessary to perform the service for the customer; and 4. a priority rule , which selects the next customer to be served by the service facility. 213 Customer population - A customer population is the source of input to the service system. If the potential number of new customers for the service system is appreciably affected by the number of customers already in the system, the input source is said to be finite . An infinite customer population on the other hand is one in which the number of customers in the system does not affect the rate at which the population generates new customers. 214 Service facility – service facilities consist of the personal and equipment necessary to perform the service for the customer. Managers should choose an arrangement based on customer volume and the nature of services performed. 215 Priority Rule - determines which customer to serve next. Most service systems that you encounter use the first-come, first –served (FCFS) rule. Other priority disciplines might take the customer with the earliest promised due date (EDD) or the customer with the shortest expected processing time (SPT). A preemptive discipline is a rule that allows a customer of higher priority to interrupt the service of another customer. Ex. Hospital ER Balking – when a customer sees a long line before he/she enters the facility and makes the decision to not go inside. Reneging
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This note was uploaded on 04/10/2008 for the course SCM 300 taught by Professor D during the Fall '07 term at ASU.

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SCM300 - Module 5 - SCM 300 MODULE 05 Study Packet Module...

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