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time discount 【商業】貼現。

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This paper develops a deterministic inventory model for perishable items with a mixture of back orders and lost sales under inflation and time discounting , where the backlogged demand rate is dependent on the negative inventory level during the stock out period . the main differences from the existing related models are that the present model takes the maximum present value of profit in a repeatable order cycle as the objective function and proposes a more practical constraint of maximum customer - waiting time to ensure a proper customer service level . then the existence and the uniqueness of the solution to relevant systems are examined and a solution algorithm is shown to find the optimal replenishment policy . at last , some numerical examples are presented to illustrate the applicatioh of the model 本文建立了一種考慮通貨膨脹與時間價值的變質性物品的庫存模型,在模型中允許短缺發生且拖后的需求速率與在缺貨期間已經發生的缺貨量有關.和已有相關模型的主要區別在于本模型把一個可重復的訂貨周期內的最大平均利潤的凈現值作為目標函數,且增加了在缺貨期間最長顧客等待時間的限制,以確保庫存系統擁有較高的服務水平.然后討論了模型最優解的存在性與唯一性,并提供了尋求模型整體最優解的算法.最后用實例說明了此模型在實際中的應用