311CribSheetmidterm1 - square: activity / upside...

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square: activity / upside downtriangle: storage / diamond: decision / arrow: flow MTO: fast but bad quality and many may not be sold risk pooling effect: by aggregating individual processes the variability is decreased and better perf can be achieved bottleneck: pushes out the slowest resource utilization rate taken into consideration u= throughput rate / capacity = measure of efficiency To improve utilization, cross train workers and adopt flexibility equipments Consider a business process with multiple stages. The utilization rate of the bottleneck resource is currently 90%. Which of the following will increase the bottleneck utilization?Decrease in capacity of the bottleneck resource crosstrain to add rep for bottleneck or add a rep for bottleneck otherwise useless throughput time: average time unit stays in the system throughput rate: average flow rate through the system If cross train: capacity = 2 (# of hours working / # produced per hour for 1st + for 2nd) flexible equipment: can produce several different products efficiently Little's law= throughput time = WIP / throughput rate = time spent on average According to LL, a restaurant increase revenue by having a larger space and higher WIP Randomness and variability forces resource idleness and longer waiting line Laws of service= satisfaction = perception - expectation Occupied waits, pre-process waits, solo waiting, anziety, uncertain waits and unexplained waits feel longer Coeff of variation = SD / mean = measure of variability Mean inter-arrival time = proba * # of periods + proba * # of periods Higher variability in inter arrival time results in higher average number in queue factores that determine waiting lines: variability, u rate and risk pooling effect If several line, calculate for each line and then multiply by the number of lines U rate increase then waiting time increase and number of orders in queue increase exponentially pooling the demand in one common line improves the performance of the system
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This note was uploaded on 09/11/2011 for the course BUAD 311 taught by Professor Vaitsos during the Spring '07 term at USC.

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311CribSheetmidterm1 - square: activity / upside...

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