变质品生产库存模型的两个最重要因素是需求率和变质率。需求率由确定性需求向随机性需求发展；变质率则由常数变质率向时变变质率发展。从规模的角度主要集中在独立企业的变质品库存问题和供应链变质品库存问题上。未来变质品的生产库存问题将主要针对供应链角度的库存问题，同时如何使一些不确定性的方法来研究库存问题也会是一个主要的研究方向。%The two most important factors of production inventory model for deteriorating items are demand rate and deterioration rate. Demand rates develop from deterministic to stochastic demand; Deterioration rates change from constant rate to time-variable rate. Deteriorating items inventory problems mainly focus on the perspective of single enterprise and the whole supply chain. In the future production inventory problem for deteriorating items will be aimed at the supply chain, at the same time how to use the uncertainty methods to study the inventory problem will be a major research direction.
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