Two-Bottleneck Smoothing Releasing Scheme
Dr. Ching-En Lee
|Keywords:||半導體工業;投料法則;雙瓶頸;semiconductor industry;releasing policy;two-bottleneck smoothing|
Recently there has been enormous investment in the semiconductor industry in Taiwan. The maximizing capacity utilization is a major focus. However, the increase of capacity utilization may cause a longer cycle time which may hinder the growth of this industry. Therefore, a good releasing policy to cope with this complicated environment is very important. Different from previous studies which designed releasing polices based on the status of a specific bottleneck. This research develops a two-bottleneck smoothing releasing scheme determining when and which wafer lot should be released into the shop floor based on the status of the top two highly utilized bottlenecks. With real-time information from manufacturing execution system (MES), the priority and the time point of releasing is adjusted dynamically. Results indicate that the proposed releasing scheme achieved a reduction of 18.5% in the mean cycle time and a reduction of 15.2% in the standard deviation of cycle time.
|Appears in Collections:||Thesis|