Empirical Evaluation of a Queueing Network Model for Semiconductor Wafer Fabrication

Modeling, Scheduling, and Prediction in Wafer Fabrication Systems Using Queueing Petri Net and Genetic Algorithm

-Wafer fabrication is one of the most competitive manufacturing business in the world. In order to survive from such strongly competitive environment, finding an effective schedule which can result in higher machine utilization and throughput rate, shorter cycle time, and lower WIP (Work-In-Product) inventory becomes a major task. Besides that, in order to help customers to make ordering decisi...

Queueing network models in the design and analysis of semiconductor wafer fabs

Capacity Determination Model with Time Constraints and Batch Processing in Semiconductor Wafer Fabrication

Recently, wafer fabrication has become more complicated and lengthened the product queue time. To ensure final product yield, engineers need to set up queue time limits for particular machines during wafer processing; we name it as “time constraints”. Time constraint problems are more serious when the time constraint is short, process is reentrant and batching. Generally, batch processing in wa...

Scheduling Semiconductor Wafer Fabrication

This paper is concerned with assessing the impact that scheduling can have on the performance of semiconductor wafer fabrication facilities. The performance measure considered here is the mean throughput time (sometimes called cycle time, turnaround time or manufacturing interval) for a lot of wafers. A variety of input control and sequencing rules are evaluated using a simulation model of a re...

Capacity planning through queueing analysis and simulation-based statistical methods: a case study for semiconductor wafer fabs

This paper presents a comprehensive framework for strategic capacity expansion of production equipment in semiconductor manufacturing, and the proposed approach is applied on a model of an actual wafer fabrication facility. It is the intention of this work to show that, once intelligently integrated, an analytical queueing model and a numeric computer simulation model can be used synergisticall...