Simulation-based optimal production planning model using dynamic lead time estimation

Production planning and scheduling models for the semiconductor fabrication manufacturing are suggested in various types according to the objectives and factors taken into consideration. The lead time is one of the important factors in production planning, but there does not exist a simple way to describe and include it in the model. In this paper, the clearing time method is suggested to model the lead time in the fabrication process of the semiconductor manufacturing, so that the dynamically changing environment on the lead time and work in process (WIP) status are considered. It is shown through the experimental computation that the suggested model yields the accurate description on the lead time on the planning model, and the appropriate planning model with good results for the important performance measures in the semiconductor manufacturing.