Re-entrant flow control in Q-time constraints processes for actual applications

This paper presented solutions respond to three issues of scheduling of semiconductor manufacturing. As the First, we introduced how to apply SCKB-REFS rule, which is the optimal re-entrant flow dispatching for maximizing throughput of quality product in Q-time constraints processes, to the case of more than two different re-entrant flows. The performance of SCKB-REFS rule is evaluated by comparing with typical rules, FCFS-CT and LPFS-CT, in case that three different flows (i.e. specifications) share the same production tools. SCKB-REFS rule achieved the best performance in terms of mean cycle time and the throughput ratio in every traffic intensity as the result.