突发事件影响的供应链系统动态仿真

为了研究突发事件对供应链绩效的长期效应,基于系统动力学构建了传统供应链模型、渠道库存控制供应链模型及供应商管理库存供应链模型.以包含一个制造商和一个供应商的二级供应链为研究对象,基于对供应链模型的仿真实验获取了供应链总库存和需求短缺量等绩效指标在无突变风险、生产突变风险和运输突变风险三种情境下的原始数据,通过对供应链绩...     

多级串行供应链的同步模式及库存优化研究

在Ciancimino和Cannella[1]提出的同步供应链概念模式上进行了数学建模,补充了库存更新的规则,提出同步供应链的单时段系统成本的核算方法,对同步模式与库存优化进行了结合研究。以系统成本为优化目标,获得供应链各级的最优安全库存因子,进行系统最优库存设置。通过算例模拟传统供应链和同步供应链的实际运作,利用通用的供应链评价指标对两种供应链模式进行比较分析,证实了结合库存优化的同步供应链模式的优越性。     

供应链中库存系统的信息熵

由于市场供给和需求的不确定性、供应链结构的复杂性以及长鞭效应(Bullwhip Effect)和反长鞭效应(AntiBullwhip Effect)等因素的影响,供应链及其库存系统存在着很大的不确定性,即供应链中的库存系统存在着熵.考虑长鞭效应和反长鞭效应下供应链中库存系统的信息熵,并进行仿真计算.研究发现库存系统在简单供应链系统中充当了信息熵的"放大器",制造商的库存系统在以制造商为核心的供应链系统中充当了信息熵的"剧增器".最后给出有效降低熵值的策略,比如采用VMI模式或JMI模式,建立各种信息系统,推动式与拉动式供应链相结合,采用电子商务与传统分销相结合的供应链模式,在整个供应链系统中建立一个信息中心.     

供应链虚拟库存决策的仿真

在供应链延迟策略和供应商管理库存（VMI）策略研究的基础上,建立了供应链延迟策略下的仿真模型,再引入虚拟库存,通过计算机仿真,探讨了虚拟库存实施前后供应链绩效的变化情况。研究结果表明,与一般的供应商管理库存相比,虚拟库存的引入使得供应链总成本和企业的服务水平均有所增加。     

多供应链间库存互补系统动力学仿真模型

以两条或多条由生产商、批发商和零售商组成的三级供应链为研究对象,首先分别建立了两条供应链环境下零售商、批发商和生产商各级节点企业库存互补系统动力学仿真模型,然后把两链间库存互补问题扩展到多链间库存互补情况.研究表明,两条供应链各级节点企业问库存互补均能减少供应链系统的库存总量和总物流成本、减弱牛鞭效应、提高顾客服务水平...     

基于数量的VMI整合补货模式下的库存控制

利用系统动力学的原理、方法,定性分析了两级供应链环境下基于数量的VMI整合补货策略,构建了该库存管理模式的系统动力学仿真模型以刻画其系统动态性,通过对随机流需求下模型仿真结果的定量分析,研究了该模式下不同经济补货阀值对牛鞭效应及库存变化的影响.结果显示,在一定范围内,较小经济补货阀值下供应链中的牛鞭效应及各节点的库存水平及波动的情况比较理想,随着经济补货阀值设定的变大,牛鞭效应、库存水平及波动逐渐加大.     

多级库存 RFID使能的 Push／Pull与（s，S）策略的仿真对比

基于RFID使能的电子看板以供应链分销网络三级库存系统为例,根据其结构特点和运作时各阶段节点企业的功能,借鉴单工厂多阶段生产存储系统最优的Push／Pull混合控制结构,设计了制造商库存采用Push控制,分销商和零售商库存采用RFID使能的Pull控制的RFID使能的Push／Pull混合控制结构。为验证混合控制策略的性能,将其与基于RFID技术的（ s,S）策略相对比,建立了两策略的数学模型及性能评价指标。考虑到供应链系统的动态性与随机性,基于离散事件系统仿真原理,设计并实现了系统的仿真模型,通过仿真实例验证并分析了混合控制策略的有效性和优越性,为供应链多级库存网络管理实践提供了参考。     

基于Agent的供应链运作仿真技术的研究

在给多个智能代理分别赋予生产运作的各种知识，如库存管理、生产计划等之后．通过多个智能代理协同合作，对供应链中企业的生产运作过程进行仿真。在研究该仿真系统的智能代理的内部任务、结构、多代理通讯机制等实现技术基础上，实现了该系统，并给出了一个供应链仿真的结果。     

基于制造延迟的VMI模型的仿真研究

在供应链延迟策略和供应商管理库存(VMI)策略研究的基础上,首先建立了供应链延迟策略下的仿真模型,然后再引入供应商管理库存策略,通过计算机仿真,探讨了供应商管理库存策略实施前后供应链绩效的变化情况.研究结果表明,与单纯的延迟策略相比,延迟与供应商库存相结合的策略能明显改善供应链的绩效.     

不确定需求影响下动态供应链库存策略选择

为解决受不确定需求干扰下的供应链库存策略选择问题,建立受不确定需求影响的、更符合实际的供应链库存系统动态模型。利用控制理论验证仿真模型的正确性,在此基础上,选取四种随机需求模型,并考虑库存成本和服务水平两个系统性能评价指标进行仿真实验,得到不同提前期不同需求模型下的最优库存策略域。对策略域进行分析,得到具有实践意义的研究结论供管理者参考。     

基于系统分析法的印刷企业物流管理分析

对印刷企业物流管理分析方法进行研究.探讨建立印刷企业物流管理系统分析法的步骤和数学模型,运用线性规划法建立数学模型,为印刷企业物流管理分析提供参考依据.     

An inventory management approximation for estimating aggregated regional food stock levels

Food is an important resource in disaster management, and food stock levels hold significance for disaster mitigation research and practice. The presence or absence of food stocks is a vulnerability indicator of a region. A large part of overall food stock, before a disaster strikes, is held by private companies (retailers, wholesalers and food producers). However, there is little-to-no information on the food stock levels of commercial companies, and no approach exists to derive such information. We develop an approximation model based on essential inventory management principles and available data sources to estimate aggregated food stock levels in supply networks. The model is applied in a case example that features dairy product stock levels in the German state of Saxonia. The resulting overall stock levels are normalised, and their usability is showcased in a simple vulnerability analysis. Disaster managers are provided with a model that can be used estimate otherwise unavailable data and facilitates investigations into the regional resilience of an area. The limitations of our study are based on the aggregated nature of the supply network structure and data usage (i.e. in the model, we do not consider any seasonality or trend effects).     

The development of an audit technique to assess the quality of safety barrier management

This paper describes the development of a management model to control barriers devised to prevent major hazard scenarios. Additionally, an audit technique is explained that assesses the quality of such a management system. The final purpose of the audit technique is to quantify those aspects of the management system that have a direct impact on the reliability and effectiveness of the barriers and, hence, the probability of the scenarios involved.

First, an outline of the management model is given and its elements are explained. Then, the development of the audit technique is described. Because the audit technique uses actual major hazard scenarios and barriers within these as its focus, the technique achieves a concreteness and clarity that many other techniques often lack. However, this strength is also its limitation, since the full safety management system is not covered with the technique. Finally, some preliminary experiences obtained from several test sites are compiled and discussed.     

An evaluation model of water-saving reconstruction projects based on resource value flows

Due to uncertainties in water supply, there is growing demand for water resource management in enterprises. In this study, we evaluated the effects of companies’ water-saving reconstruction projects. We used Hina Advanced Materials Company as a case to construct an investment decision model to (1) calculate the internal and external costs of water resources based on circular economic value analysis theory, and (2) locate the level of water resources circulation. We adopted gray situation decision analysis to identify the typical problems that occur in water resource utilization. Moreover, we demonstrated optimization plans for different potential improvements, thereby providing guidance and references for water resource cost management and the comprehensive optimization of environmental benefits. We concluded that the circulation economic value analysis model can effectively display the flow and amount of value derived from water resource flows, thereby providing guidance and suggestions for optimizing water resource flows.     

Development of the Swedish bridge management system by introducing a LMS concept

The Swedish Road Administration (SRA) has developed an information technology (IT) based bridge and tunnel management system (BaTMan) that is widely implemented by the organisation. The system is a tool for operational, tactical and strategic management. However, this system does not include systems and tools for managing optimisation and long-term planning of␣Maintenance, Repair and Rehabilitation (MR&R) actions due to service life performance aspects. This paper discusses the need of service life performance analysis for sound optimisation and long-term planning of MR&R actions in the bridge management. The paper presents a service life performance analysis model that is based on a Markov chain model and the MEDIC method. The model is developed to manage different kinds of degradation characteristic and yet present a uniform result expressed in conditional probabilities. The paper discusses also the need of systems and tools for describing objects on both an overall level and on a component level.     

The Development and Comparative Analysis of Engineering Project Management Modes

Engineering project management is the whole process of project construction management activities up to the point of achieving the goals of engineering construction, which adopts the means of planning, organizing,leading, and controlling. In addition, engineering project management modes are the works of project management and the technical guarantee of project success. For the quality and efficient transformation demands of the Chinese construction industry in the process of marketization, internationalization and informatization, based on the connotation and development path of engineering project management modes, the 16 main and new kinds of project management modes both domestically and abroad are divided into trading mode, financing mode and management mode. These have led to comparative analysis and brief commentary. Finally, it will be pointed out that the engineering project management modes move throughout the whole management process, the combined model and the expansion development of financing model. This work will provide reference for project participants to choose the appropriate project management modes and better understand building company transformation.     

基于可视化仿真的隧道工程施工进度分析与控制研究

介绍了基于GIS的隧道工程施工进度可视化仿真方法仿真模型;提出了基于可视化仿真的隧道工程 施工进度风险分析及决策方法,使施工资源优化;论述了基于可视化仿真的隧道工程施工进度S型曲线实时管 理与控制方法;最后进行了实例研究。     

面向协调的区域"经济-环境"系统管理模型

从管理的动态性特征出发,用复合子f、协调机制c、评价标准g来描述面向协调的管理的概念模型.在此基础上,按照系统分析、系统评价、系统调控三个步骤建立了面向协调的区域"环境-经济"系统管理模型.提出了基于系统功能和效益(率)的系统发展状态评价指标体系,应用灰色关联分析法遴选出与该复合系统在发展过程中联系最紧密的系统要素.最后对西安市的经济-环境进行了实证分析.     

Analysis of synergy degree and its influencing factors in hydropower EPC project management

The use of engineering procurement construction (EPC) mode is currently a trend in hydropower engineering construction. The clarification of the internal relationship between hydropower EPC projects and the realization of synergy has great significance in improving management efficiency and implementation effect. In this work, a three-dimensional system and a system model of hydropower EPC project management synergy are constructed. The mechanism and factors that influence the degree of management synergy are analyzed on the basis of management synergy theory. Furthermore, the evaluation index system and the degree of synergy model are established, and grey relational analysis is utilized to identify the key factors that affect the synergy degree. Thus, this study aims to facilitate the hydropower EPC project management synergy, provide a quantitative method for synergy degree evaluation, and propose corresponding promotion strategies. Results show that the order degree of each subsystem presents a steady upward trend. Specifically, the order degree of the subsystem at the trial operation stage is low, which is the major restriction on the further improvement of the synergy degree of EPC project management. The key factors in improving the synergy level of hydropower EPC project management are mainly concentrated in the information and organization synergy subsystems, including the construction degree of information platform, the performance of functions, the timeliness of information transfer, and the functions of the information platform.     

Enterprise risk management: a DEA VaR approach in vendor selection

Enterprise risk management (ERM) has become an important topic in today's more complex, interrelated global business environment, replete with threats from natural, political, economic, and technical sources. The development and current status of ERM is presented, with a demonstration of how risk modelling can be applied in supply chain management. Within supply chain management, a major managerial decision is vendor selection. We start with discussion of the advanced ERM technology, i.e. value-at-risk (VaR) and develop DEA VaR model as a new tool to conduct risk management in enterprises. A vendor selection set of data is used to demonstrate how this model can be used to assess supply risks in ERM. Such models provide means to quantitatively improve decision making with respect to risk.