Abstract
AbstractEWMA feedback controller is one of the run-by-run control methods which is very important. This method uses the result of the previous batch to optimize the output of the process. By adopting appropriate weight factors, the input variables of the next batch size will be adjusted. In the real world, the manufacture process will age. Taking the effect of aging process to the output into consideration, we can use double feedback controller to adjust the production process.In traditional, fixed discount factor is usually applied in double feedback controller. However, it often leads to a dilemma of the deviation in the initial production process or the variance of the output of the process. It is useful to insure the convergence of the manufacture process by adopting smaller discount factors, but it will need longer production period to make the output achieve the goal. This will lead high rework cost in the environment of IC production in nowadays. In order to redeem the inefficiencies of fixed discount factor, this research aims at the concept of the dynamic discount factor to adjust the production process. Under the objective of minimize the TMSE of the limitation batch size, this model formulated the optimal dynamic discount factor controller, and made comparison between this new method and the traditional one in the effectiveness of execution.