arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2202.08803math.OC
收藏

用于(R, s, S)策略参数计算的随机动态规划启发式方法

Stochastic Dynamic Programming Heuristic for the (R, s, S) Policy Parameters Computation

Andrea Visentin, Steven Prestwich, Roberto Rossi, S. Armagan Tarim

AI总结:

本文提出一种结合贪心松弛与修改版Scarf(s, S)SDP的启发式方法,用于计算非平稳随机库存问题中的(R, s, S)策略参数,并利用K-凸性和记忆化技术显著加速计算,实验表明其速度远超现有方法。

摘要:

(R, s, S)是一种被实践者广泛使用的随机库存控制策略。在按照该策略管理的库存系统中,库存在时刻R进行盘点;如果观测到的库存水平低于再订货点s,则发出订单。订单数量设定为将库存水平提升至订货上限水平S。本文引入了一种新的基于随机动态规划(SDP)的启发式方法,用于计算非平稳随机批量问题中的(R, s, S)策略参数,该问题考虑过量需求的延期交货、固定订货成本和盘点成本,以及线性持有成本和缺货惩罚成本。在最近的一项工作中,Visentin等人(2021)提出了一种在这些假设下计算最优策略参数的方法。我们的模型将问题的贪心松弛与Scarf(s, S)SDP的修改版本相结合。该模型的简单实现需要极大的计算量来计算参数。然而,我们可以通过利用K-凸性性质和记忆化技术来加速计算。由此得到的算法比现有最先进方法快得多,扩展了实践者的可采纳性。一项广泛的计算研究将我们的方法与文献中已有的算法进行了比较。

英文摘要:

The (R, s, S) is a stochastic inventory control policy widely used by practitioners. In an inventory system managed according to this policy, the inventory is reviewed at instant R; if the observed inventory position is lower than the reorder level s an order is placed. The order's quantity is set to raise the inventory position to the order-up-to-level S. This paper introduces a new stochastic dynamic program (SDP) based heuristic to compute the (R, s, S) policy parameters for the non-stationary stochastic lot-sizing problem with backlogging of the excessive demand, fixed order and review costs, and linear holding and penalty costs. In a recent work, Visentin et al. (2021) present an approach to compute optimal policy parameters under these assumptions. Our model combines a greedy relaxation of the problem with a modified version of Scarf's (s, S) SDP. A simple implementation of the model requires a prohibitive computational effort to compute the parameters. However, we can speed up the computations by using K-convexity property and memorisation techniques. The resulting algorithm is considerably faster than the state-of-the-art, extending its adoptability by practitioners. An extensive computational study compares our approach with the algorithms available in the literature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑