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合作连锁营销下随机需求的分销系统双层补货优化控制模型 总被引:1,自引:0,他引:1
研究在每一补货间隔内需求为服从有限区间上渐变对称分布的随机变量的各零售商集体与一个地区分销中心组成的地区分销系统.分销系统中各零售商可独立决定所经营卖场的补到水平,补货周期是固定值;分销中心给各零售商送货,送货循环周期固定,各零售商补货周期等于分销中心送货循环周期.假定零售商顾客需求是均匀发生的,给出了零售商补到水平优化控制策略和分销中心进货控制策略.最后,通过一个算例验证了该模型的有效性. 相似文献
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随机需求随机补货间隔零售商补货控制策略研究 总被引:1,自引:0,他引:1
研究分销系统中零售商的补货控制策略.分销系统中各零售商可独立决定自己的补到水平.零售商需求率是随机变量.服从某一泊松分布;分销中心循环为各零售商送货.送货间隔是随机变量.认为所有未满足的需求销售机会都丢失,零售商既要支付库存持有费用.又要支付缺货损失费用.给出了收益数学期望值函数,求出了送货间隔是均匀分布随机变量时使收益数学期望值最大化的零售商补到水平控制策略. 相似文献
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库存和运输是物流活动的最主要环节,如何同时对二者进行优化,是供应商管理库存必须解决的核心问题。针对一个配送中心为多个零售商实施统一配送的两级系统,以最小化系统计划期平均总费用为目标,分析包括零售商存储费、缺货费,以及配送中心进货费、存储费和配送费的系统全部费用组成,整合库存与配送建立了库存路径问题数学模型。根据零售商需求的随机性和库存路径问题本身的两阶段性,估计零售商库存上下限,选择配送中心订货策略及配送优先原则,借鉴旅行商问题求解思路,设计了求解问题的启发式算法。用Matlab7.0编程实现仿真算例求解表明,整合优化比分别优化节省平均总费用6.2%。 相似文献
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研究随机需求下供应商资金受限的供应链协调问题,基于供应商管理库存(VMI)建立零售商-供应商Stackelberg博弈模型,分析库存补贴策略和零售商预付款策略对供应链绩效的影响,并比较两种策略的适用范围。结果表明,零售商可以通过库存补贴策略消除分散决策下双重边际效应导致的供应链绩效损失,同时提高供应商和零售商利润。相比于库存补贴,零售商预付款策略可以消除由供应商资金受限导致的供应链绩效损失,并减小部分由双重边际效应导致的供应链绩效损失,实现帕累托改进,提高供应链整体绩效。 相似文献
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由于射频辨识(radio frequency identification,RFID)激励的电子看板系统能够从远端看见供应链节点企业库存的状况,使得广域分布的供应链多级存储能够实现RFID激励的Pull控制.本文根据供应链分销网络多级存储的结构特点,以及系统运作期间各阶段节点企业的功能,在不同阶段采用不同的控制策略.因此,设计了多种不同的RFID激励的Push/Pull混合控制策略.为了比较和验证各混合策略对多级存储的控制性能,建立了以总库存成本、总缺货损失、总运行成本和库存周转率作为评价策略性能的指标体系.由于供应链系统的动态性与随机性,难以进行数学建模和精确求解,因此基于离散事件系统仿真原理,设计并实现了仿真模型.通过对各策略下多种结构的供应链分销网络多级存储的仿真,验证并分析了制造商阶段采用Push控制,分销商和零售商阶段采用Pull控制的策略的有效性和最优性. 相似文献
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This paper studies how a global manufacturer with many subsidiaries can achieve enhanced business value for the organization by sharing information within its supply chain network. Specifically, the uncertainties in the demands from the downstream distribution center affect the inventory levels at the upstream distribution center under different inventory policies, considering the uncertain lead times and the given order fill rates. With a generic simulation model and real data, we evaluate the magnitude of savings in inventory under the new inventory policy where information can be shared among subsidiaries, compared to the status quo where subsidiaries run independently with no information sharing. The results show that average inventory level at the upstream DC under the new policy would be reduced by approximately 3%. Considering the given manufacturer's global supply chain distribution network holds about $4 billion in average inventory, the 3% improvement is a very significant savings. 相似文献
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主要以事件调度法作为仿真算法的基础,设计了家电配送中心库存控制仿真系统,并应用模拟数据运行了该仿真系统分析库存系统这种复杂离散事件系统.家电配送中心库存控制仿真系统克服了库存系统中存在大量不确定的随机因素,并较好地分析了库存系统规划、库存成本分析、库存控制策略各变量间的复杂关系.家电配送中心库存系统能帮助决策者制定优化... 相似文献
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This paper deals with a two-stage supply chain that consists of two distribution centers and two retailers. Each member of the supply chain uses a (Q,R) inventory policy, and incurs standard inventory holding and backlog costs, as well as ordering and transportation costs. The distribution centers replenish their inventory from an outside supplier, and the retailers replenish inventory from one of the two distribution centers. When a retailer is ready to replenish its inventory that retailer must decide whether it should replenish from the first or second distribution center. We develop a decision rule that minimizes the total expected cost associated with all outstanding orders at the time of order placement; the retailers then repeatedly use this decision rule as a heuristic. A simulation study which compares the proposed policy to three traditional ordering policies illustrates how the proposed policy performs under different conditions. The numerical analysis shows that, over a large set of scenarios, the proposed policy outperforms the other three policies on average. 相似文献
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An accurate model for the inventory shortfall distribution is necessary to calculate the target level required to give a desired service level in manufacturing systems under stochastic demand and production capacity constraint. Existing methods for modelling the inventory shortfall require that the demand distribution be expressible in functional form and that the coefficient of demand variation be small. When these conditions cannot be met, the only recourse to a practitioner is to set target levels using simulation-based optimisation, which is computationally intensive and time consuming. By contrast, this paper presents a model in which the inventory shortfall is approximated by sampling from a single simulation run of the inventory process. The target level required for a given service level can then be calculated efficiently, to a high degree of reliability, using an iterative search. This new model is thus an efficient alternative to conventional simulation-based optimisation. Because the shortfall distribution is generated by simulating demand directly, the model makes no assumptions about the form of the demand distribution. By requiring no user modelling of the functional form or parameters of the demand distribution, this new method is easily used by inventory managers in practice or implemented in software. 相似文献
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Biswajit Sarkar Leopoldo Eduardo Cárdenas-Barrón Mitali Sarkar Moses Laksono Singgih 《Journal of Manufacturing Systems》2014
This paper revisits the economic production quantity (EPQ) model with rework process at a single-stage manufacturing system with planned backorders. It is well known that any imperfect production system of real life has random defective rates. In this direction, this paper extends an inventory model to allow random defective rates. Basically, three different inventory models are developed for three different distribution density functions such as uniform, triangular, and beta. The analytical derivation provides closed-form solution for each inventory model. We have made comparison tables of optimal results among the distribution functions. Some numerical examples and sensitivity analysis are given to illustrate the inventory models. 相似文献
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研究了随机需求条件下由单供应商、候选分拨中心和分销点构成的选址-库存问题,分销点、分拨中心分别基于周期检查(R,s,Q)和连续检查(s,S)库存控制策略.综合考虑库存成本、运输成本和设施成本之间的均衡关系,建立了二级库存与无能力约束选址集成规划模型.给出了适合求解实际规模问题的拉格朗日松弛算法,提出了求解子问题的有效启发式方法,改进了次梯度优化方法.通过仿真试验验证了模型的正确性和算法的有效性.最后讨论了相对于传统规划方法,需求方差、服务水平、持有成本、提前期等关键库存控制参数对系统运营成本节约的影响规律. 相似文献
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随机需求下的选址-库存配送系统集成规划模型及算法 总被引:5,自引:0,他引:5
研究了随机需求条件下由单供应商、候选分拨中心和分销点构成的选址-库存问题, 分销点、分拨中心分别基于周期检查(R, s,Q)和连续检查(s, S)库存控制策略. 综合考虑库存成本、运输成本和设施成本之间的均衡关系, 建立了二级库存与无能力约束选址集成规划模型. 给出了适合求解实际规模问题的拉格朗日松弛算法, 提出了求解子问题的有效启发式方法, 改进了次梯度优化方法. 通过仿真试验验证了模型的正确性和算法的有效性. 最后讨论了相对于传统规划方法, 需求方差、服务水平、持有成本、提前期等关键库存控制参数对系统运营成本节约的影响规律. 相似文献