| Summary: | 碩士 === 國立中央大學 === 工業管理研究所碩士在職專班 === 99 === TFT-LCD industry is one of the capital-intensive industries. In recent years, the expenditure of equipment gets higher and higher owing to the larger-size glass substrates and the investment of new plant, somehow even excess ten billion New Taiwan Dollars. The manufacturing cost increases gradually what enforces the manufacturers maximize their profit through cost down. Therefore, cost-down activities become one of the most important things to TFT-LCD manufacturers.
In the manufacturing process, the WIP could protect the production line from starving, but it becomes a serious loading as well to the manufacturers. As a result, the WIP is the necessary evil. How to control the WIP level to keep the production line running and lower the cost of manufacturing at the same time is a significant job.
In this research, the DMAIC provides a rigorous and pragmatic framework for set a WIP level. First, find out the problem and define it clearly. After data collection, it should be converted to fit the software attributively. At the analysis stage, set the WIP level by using three methods, regression, decision tree and correlation coefficient. Next step, create a warning and feedback mechanism from the concept which TOC developed. Finally, monitor the target achievement of output and keep rolling this process to lower the WIP level.
This process provides a possible mechanism for the manufacturers, who are eager to eliminate the unnecessary expenditure, to reduce the production cycle time and to improve the production efficiency.
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