物流系统中安全库存决策模拟方法研究

针对物流系统中安全库存决策问题,以分拨中心库存为核心,建立物流系统的多级库存结构的分析模型,采用BPMN为描述手段分析多级库存系统的业务流程模型,开发Arena模拟平台上的安全库存决策模拟模型。阐述采用上述三种模型,建立支持物流系统中安全库存决策模拟系统的方法。     

基于Extendsim的多级库存系统仿真

针对多级库存难以控制的问题,利用Extendsim软件对需求和提前期均随机的多级库存系统进行建模和仿真,以供应链的利润最大化为目标,结合该软件的Optimizer模块,对多级库存各节点的订货点、订货量进行遗传算法计算。从而有效地解决了多级库存难以管理的问题。     

电子商务中的多级供应链库存成本研究

在考虑多级供应链的情况下,对电子商务中的传统库存管理模式和供应商管理库存（VMI）模式建立库存成本模型;并运用遗传算法进行模拟分析。该多级供应链由多个原材料供应商、一个核心制造商、多个销售商以及客户组成。通过对两种库存管理模式的比较分析,得出在电子商务中引入VMI模式后,库存成本得到明显降低。     

基于复杂供应链库存管理策略的系统动力学研究

在分析了具有不同提前期和加工时间的复杂供应链特点基础上，研究了混合CONWIP／Kanban库存管理思想与同步CONWIP库存管理思想在复杂供应链上的应用。同时借助Vensim建模平台。针对这两种管理思想建立了基于复杂供应链系统的动态仿真模型，并对模拟结果进行了分析。     

多级供应链物流计划模型及优化算法研究

建立了有多种约束条件的多级供应链物流计划模型,设计了求解模型的改进遗传算法.首先考虑生产、库存、运输等约束条件,建立了复杂多级供应链物流计划模型,用实数编码遗传算法加以求解,并用自适应变异方法调整变异操作参数,可以使多级供应链物流计划编制结果有较大改善.     

动力煤供应链多级库存控制模型与算法研究

为了降低动力煤供应链库存总成本,并保障动力煤资源供需系统持续稳定运行,引入多级库存控制理论,建立了基于成本最小化的动力煤供应链多级库存控制概念模型与数学模型,设计了遗传算法求解储配煤基地和区域性配送中心的最佳订货点、订货批量及调拨批量。最后,通过算例证明了该模型与算法的有效性和实用性。基于上述研究结论,为我国动力煤供应链库存控制提供了决策支持和对策建议。     

基于定期检查处理的逆向物流库存控制研究

针对再制造逆向物流系统,研究整个供应链的逆向物流库存控制问题,考虑多种产品和原材料,建立一种具有周期相关的再制造逆向物流多级库存控制模型,该模型可以确定新产品的制造批量和回收产品的再制造批量,达到优化供应链库存、减少库存总成本的目的。     

随机型连续盘点订货模型中供应链周期服务水平的波动和优化

对存在数量折扣和运费折扣的随机型连续盘点库存策略,进行了建模和分析,设计了供需双方合作的库存策略和订货策略,给出了理想的经济订货量和订货价格的甄选方法流程,模型确定了供应链理想的周期服务水平,证明了在该策略下,理想周期服务水平对于订货批量具有相对稳定性,并分析了此稳定性对供应链整体的重要意义,以及模型近似的合理性。在这个服务水平上,确定了再订货点和安全库存,并分析了该策略对供应链各方在管理措施方面的启示。利用该模型进行库存和订货决策,设计供应链合同,可以在不伤害服务水平的基础上,降低供应链总成本。     

需求确定型多级库存优化模型研究

多级库存管理对于企业来说具有重要的意义,在需求确定的情形下对库存模型进行了分析,建立了基于确定需求的多级库存数学模型,包括一个单目标模型和一个多目标模型,使供应链的效率得到了有效提高。     

基于组库存策略和多Agent技术的库存管理模型

建立了一个基于多级组库存策略的多Agent的库存管理模型,模型用RFID技术采集数据,为库存管理软件设计提供了一种新的思路.     

基于定常需求的多级供应链联合决策研究

联合决策为整条供应链增加利润或者降低成本,位于供应链上游的企业可以通过联合决策获得规模优势,位于下游的企业要为此付出代价。通过建立多级供应链库存模型,用数学规划的方法求出模型的最优解,并通过数值例子来证明联合决策为整个供应链系统带来更大收益,同时位于供应链上游的企业在联合决策中受益最多。     

供应链数量折扣契约与退货契约研究评述

供应链契约是目前供应链管理研究的前沿问题之一,主要目标是解决如何协调供应链中各方的决策和利润分配,其中数量折扣契约和退货契约是目前研究较多、应用较广泛的契约形式.本文综述了数量折扣契约和退货契约的研究现状,指出以下问题是未来重要的研究方向:(1)不确定需求下的数量折扣契约;(2)数量折扣与退货的组合契约;(3)跨国供应链数量折扣契约、退货契约;(4)多级供应链的数量折扣契约、退货契约.     

基于供应链管理的两阶段联合库存S.D模型

运用系统动力学方法构建了基于供应链管理的联合库存S.D模型。首先,在联合库存系统边界优化的基础上,构建了基于供应链管理的两阶段联合库存因果关系图;其次,构造出S.D模型的流图,确切描述出反馈系统的动态性能,界定了流图的主要变量,构造合理的模拟方程和函数,阐述流图中各子模块内部运行机理;最后,结合具体公司的库存管理现状,在模型通过检验的前提下,进行了模型行为预测分析及联合库存模式与传统库存模式之对比分析,从中得出一些较有实际意义的模拟分析结果,为优化库存提供了有益的理论指导。     

Investigating the value of information sharing in multi-echelon supply chains

Under the structure of multiple business entities, supply chain management (SCM) offers the external and internal integration of business processes in enterprises. The most important objective of SCM is to enhance the supply chain performance such as reinforcing the service level and increasing profit as well as reducing order cycle time and inventory. In recent years, due to the advancement of information technology, enterprises can manage the product flow and the information flow via economical and efficient mechanisms. The well-organized information sharing can enhance the supply chain performance and allow enterprises to refine their strategies of supply chain in order to maximize their profits. The previous studies pointed out the positive effect of information sharing on the efficiency of supply chain. However, relatively little literature focuses on the performance analysis for multi-echelon supply chain with various information sharing scenarios. By using the simulation technique, this paper models different scenarios of information sharing, and further analyzes the impacts of information quality on multi-echelon supply chain performance. In addition, this paper employs Data Envelopment Analysis (DEA) to integrate multiple performance measures to ensure the information sharing scenarios with enhanced performance.     

一类复杂闭环供应链多级库存系统的最优控制策略

利用排队理论,构建了一个回复中心、多个回复站组成的复杂再制造多级库存系统模型,并给出了该系统的最优控制策略。数值分析表明,随着回收率的增加,订货成本减少,但是总库存成本并非单调递减,呈先降后升的趋势,同时,回收率对回复中心订货批量的影响要大于对回复站的影响。此外,可回复率和单位缺货成本对系统也具有重要的影响。     

Common inventory modeling assumptions that fall short: Arborescent networks, Poisson demand, and single-echelon approximations

Traditional multi-echelon inventory theory focuses on arborescent supply chains that use a central warehouse which replenishes remote warehouses. The remote warehouses serve customers in their respective regions. Common assumptions in the academic literature include use of the Poisson demand process and instantaneous unit-by-unit replenishment. In the practitioner literature, single-echelon approximations are advised for setting safety stock to deal with lead time, demand, and supply variations in these settings. Using data from a U.S. supplier of home improvement products, we find that neither the assumptions from the academic literature nor the approximations from the practitioner literature necessarily work well in practice.In a variation of the strictly arborescent supply chain, the central warehouse at our real company not only replenishes other warehouses but also meets demand from customers in the region near the central warehouse. In this paper, we study this dual-role central warehouse structure, which we believe is common in practice. Using high and low volume product demand data from this company, we use Monte Carlo simulations to study the impact of (1) the use of a dual-role centralized warehouse, (2) common demand assumptions made in multi-echelon research, and (3) single-echelon approximations for managing a multi-echelon supply chain. We explore each of these under both centralized and decentralized control logic. We find that the common assumptions of theoretical models impede their usefulness and that heuristics that ignore the actual supply chain structure fail to account for additional opportunities to utilize safety stock more effectively. Researchers should be aware of the gap between standard assumptions in traditional literature and actual practice, and critically evaluate their assumptions to find a reasonable balance between tractability and relevance.     

基于供应商管理库存的信息系统设计研究

自从"零库存"的概念被丰田汽车公司提出以后,40多年来各生产企业绞尽脑汁考虑如何通过有效的运作与管理将库存降到最低.现在,供应商管理库存(VMI,Vendor Managed Inventory)的模式逐渐被国内企业接受.供应商管理库存,是在供应链管理理念下要求的产物。它要求供应商对下游企业库存策略、订货策略以及配送策略进行计划和管理。所以,采用合理模式运作VMI就成了当前要解决的问题。     

基于供应链环境下联合库存管理研究

随着供应链管理的发展,企业越来越注重对供应链成本,特别是库存成本的管理。本文回顾了供应链库存管理方法的演变过程,重点介绍了一种新的库存管理方法——联合库存管理。并建立了简单的成本比较模型,同时还对供应链上下游企业之间的利益分配进行了简单的博弈分析。     

Application and research on the complex dynamics behaviour under price-discount promotion policy in inventory control system

In this paper, we study the inventory control system of the apparel industry supply chain in which the products are fast-fashion and mass-consuming goods. Retailers tend to promote by price-discount policy to regulate overstock situation caused by fluctuated demand, frequent product upgrading, etc. Here, we discuss the impact of fluctuated demand triggered by price-discount promotion policy on the comprehensive inventory control system in which the final inventory and supply line stock are considered and weighted differently according to corresponding practical operation situations. In this model, stock returns are permissible. Then we calculated the Lyapunov stable region of the decision parameters based on the state space model. These conclusions present the managers a big picture to inspect the inventory control system and serve as reliable references to make correct decisions.