存貨可即時地滿足顧客需求來提高顧客服務水準，但過多的存貨卻容易造成倉儲空間的浪費、存貨成本的增加以及企業營運資金的積壓。因此，在現今消費性市場環境劇烈變動及產品生命週期愈來愈短的衝擊下，不當的庫存管理將造成庫存堆積，無法銷售出去轉換成現金，不僅物流倉儲會產生相對應的費用，對於公司的資金運用也產生壓力，推動資金成本上升，連帶增加公司營運風險。
目前被廣泛應用於物料管理的物料需求規劃(Material Requirements Planning, MRP)因為物料的相依性導致當供應的高度可變性和需求的高波動性容易使整體物料處於緊張狀態。本研究運用DDMRP(Demand Driven MRP)模擬實際個案的歷史數據，利用緩衝區設定及需求動態規劃對個案存貨進行模擬；研究結果顯示，在滿足後段需求的狀況下，DDMRP能有效降低庫存水位並優化存貨週轉率(次數)和存貨週轉天數。

Inventory can instantly meet customer demand to improve customer service standards, but excess inventory can easily cause waste of storage space, increase in inventory costs, and backlog of corporate working capital. Therefore, under the impact of the drastic changes in the current consumer market environment and the ever-shorter product life cycle, improper inventory management will cause inventory to accumulate and cannot be liquidated. Not only will logistics and warehousing incur corresponding costs, but also for the company. The use of funds also creates pressure, which drives up the cost of funds, which in turn increases the company’s operational risks.
At present, Material Requirements Planning (MRP), which is widely used in material management, is subject to high variability in supply and high volatility in demand due to the dependence of materials, which tends to put the overall material in a state of tension. This thesis uses DDMRP (Demand Driven MRP) to simulate the historical data of actual cases, and uses buffer setting and demand dynamic planning to simulate case inventory. The findings indicate that DDMRP can effectively reduce the inventory level and optimize the inventory turnover rate (number of times) and the number of inventory turnover days under the condition of meeting the demand of the module factory.

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