A study of wafer fab dispatching rules based on empirical flow timepredictions

摘要

This study examined two dispatch rules-modified least slack ruleand shortest remaining flow time rule. Both of these rules requirefuture flow time prediction. We experimented with two flow timeprediction methods-an exponential smoothing method and an iterativeempirical curve approach. These new rules were compared with some othercommonly used rules by simulation experiment. For the performancemeasure of mean flow time, the shortest remaining processing time ruleperformed best. Whereas, for the performance measure of standarddeviation of flow time, the modified least slack rule with the flow timeprediction by the iterative empirical curve approach performedbest