The research on dispatching rule for improving on-time delivery for semiconductor wafer fab

Semiconductor wafer fab cries for really dynamic dispatching approach, due to its high uncertainty, re-entrance and large-scale. A dispatching rule for improving on-time delivery for semiconductor wafer fab (ODDR) is proposed, which considers the dispatching of bottleneck machines, not-bottleneck machines, batching machines and hot lots. As a result, it can distinctly improve on-time delivery without decreasing the throughput and increasing the cycle time. Finally, a simplistic model, but with essential characteristics of semiconductor wafer fab, is used to compare ODDR with FIFO, EDD and CR. It can be seen from the experimental results that ODDR is prior to FIFO, EDD and CR on throughput, cycle time and on-time delivery with better performance, especially for on-time delivery.