| Summary: | 碩士 === 中原大學 === 工業與系統工程研究所 === 98 === Manufacturers must make a good decision under the more and more competitive environment. They could be driven out by other competitors with improper or wrong decisions. Thus, to make their products more competitive in the market, a majority of manufacturers adopt a cost-down strategy as a main measure by mass production. However, mass production does not guarantee a successful cost-down strategy due to a number of reasons, such as inventory costs by the uncertain a product demand. Even the opposite results are possibly and exactly produced. Furthermore, manufacturers can't do all the productions by themselves; they must be ordered to upstream suppliers of raw material or semi-finished products. However, suppliers have their lead time, so customers will spend too much time in waiting for their demands and finally such customers are lost if a bad inventory management is provided. Therefore, a good inventory management system will benefit manufacturers a lot.
Due to the above reasons, a queueing model can help us construct a system conforming to production system owned by manufacturers. And use the mathematical methods to obtain the performance indices. Through allowing performance indices achieving predicted conditions, optimal base-stock level will be found. For such motivations, this study will discuss a tandem production system with end buffer, acquire fill rate of no wait demands and on-time-delivery-rate(OTDR) of wait demands that is regarded as performance indices of measuring production system by using phrase-type distribution. Finally, we will find the optimal base-stock level under the conditions of performance indices.
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