Easy-to-use estimators for waste, on shelf availability and number of orders in a periodic review inventory system with perishable items

IF 9.8 1区 工程技术 Q1 ENGINEERING, INDUSTRIAL
Karel van Donselaar, Rob Broekmeulen
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Abstract

We consider a periodic review inventory system with perishable items having a fixed case pack size and a shelf life between three and nine days. To assist retailers in reducing food waste, we develop easy-to-use estimators for the waste fraction, the on shelf availability and the number of orders. Since the estimators are easy to use, managers can develop their own logic and tools to support assortment, buying and replenishment decisions for perishable items. We assume stochastic discrete demand, consumers buying the oldest items first and a replenishment policy which considers information on the ages of the inventory on the shelf. The estimators can be used for classification, evaluation and optimization purposes. The average relative cost error when using the easy-to-use estimators to determine the optimal safety buffer as well as the optimal case pack size in the base setting is equal to 0.40 % and its standard deviation is equal to 1.19 %. Relaxing the assumptions in the model leads to average relative cost errors which are still less than 1 % except for two scenario's: when demand shows a very strong week pattern and when a large part of customers do not buy the oldest item first. For those scenario's additional research is needed. While the estimators perform well for classification and cost optimization in most scenario's, the estimators may be far off when used as stand-alone estimators. For those situations we suggest to use a more advanced estimator. Hence we also determine the added value from using more advanced estimators.
易于使用的估计浪费,货架上的可用性和订单数量在一个定期审查库存系统与易腐物品
我们考虑一个定期审查库存系统,易腐物品有一个固定的箱子包装大小,保质期在3到9天之间。为了帮助零售商减少食物浪费,我们开发了易于使用的估算器,用于估算浪费比例、货架可用性和订单数量。由于估算器易于使用,管理人员可以开发自己的逻辑和工具来支持易腐物品的分类、购买和补充决策。我们假设随机离散的需求,消费者首先购买最旧的物品,并考虑到货架上库存的年龄信息的补充政策。估计器可用于分类、评价和优化目的。使用易于使用的估计器确定最优安全缓冲区和最优包装尺寸时的平均相对成本误差为0.40%,其标准差为1.19%。放宽模型中的假设会导致平均相对成本误差仍然小于1%,除了两种情况:当需求显示出非常强劲的周模式时,以及当大部分客户不首先购买最旧的商品时。对于这些场景,需要进行额外的研究。虽然估计器在大多数情况下都能很好地进行分类和成本优化,但当作为独立的估计器使用时,估计器可能还远远不够。对于这些情况,我们建议使用更高级的估计器。因此,我们也通过使用更高级的估计器来确定增加值。
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来源期刊
International Journal of Production Economics
International Journal of Production Economics 管理科学-工程:工业
CiteScore
21.40
自引率
7.50%
发文量
266
审稿时长
52 days
期刊介绍: The International Journal of Production Economics focuses on the interface between engineering and management. It covers all aspects of manufacturing and process industries, as well as production in general. The journal is interdisciplinary, considering activities throughout the product life cycle and material flow cycle. It aims to disseminate knowledge for improving industrial practice and strengthening the theoretical base for decision making. The journal serves as a forum for exchanging ideas and presenting new developments in theory and application, combining academic standards with practical value for industrial applications.
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