| Summary: | 碩士 === 大葉大學 === 工業工程與科技管理學系 === 95 === This research investigated an extended economic production quantity (EPQ) model with imperfect quality and backorder. The classic EPQ model assumes that manufacturing facility functions perfectly during a production run. However, due to process deterioration or other factors, the production process may shift and produce imperfect quality items.
In this study, we study two cases: one is quality sceening conducted during production, the other is the sceening process starts once normal production stops, Not all of the defective items are reworkable, a portion of them are scrap and discarded. Furthermore, not all of the defective items are perfect quality items sfter rework. The reworked items are classifed into the restored perfectly items and the secondary product items.
This research evaluated the effects of defective rate and and reworkable portion ratio on the the expected annual cost, optimal production lot size and the maximal level of backorder.
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