整车制造企业安全库存设置

以一个整车制造企业为对象,分析了其零件的采购提前期和需求量,结合统计学方法,对其安全库存设置进行了分析并用算例进行了说明。     

整车制造企业安全库存设置

以一个整车制造企业为对象,分析了其零件的采购提前期和需求量,结合统计学方法,对其安全库存设置进行了分析并用算例进行了说明.     

基于ANFIS神经网络的水处理药剂采购提前期模型

水处理药剂的采购提前期对自来水的生产保障十分重要。本文基于减法聚类的ANFIS神经网络,以水处理药剂采购提前期的影响因子作为模型的输入层,建立水处理药剂采购提前期预测模型,计算结果证明该模型能够准确预测出水处理药剂的采购提前期,为采购工作提供指导参考。     

基于BP神经网络的订单式供应链采购提前期研究

采购对于订单式供应链具有重要的作用,采购提前期制订的合理与否直接影响到企业生产过程和订单的顺利交割。随着市场竞争环境的供应链化,对于供应链中进行生产加工活动的企业,越来越多的生产设备、原材料等生产投入要素需要相应的配套企业来提供．这就对采购活动提出了更高的要求,采购提前期在供应链中的重要性更加突出。文章利用BP神经网络,对提前期分解,对阶段时间进行预测,以满足企业供应链采购管理发展的需要,并且通过实证说明方法的有效性。     

基于流程行业ERP环境下的采购和库存管理系统

根据面粉加工企业的特点，运用ERP系统对企业物料采购与库存进行管理，提高信息共享程度，规范企业管理流程，降低库存成本。缩短采购提前期，改善客户服务质量，促进企业管理的不断完善与发展。     

售后配件需求预测在供应链管理中的应用

文章首先对发动机售后配件供应链特点和供应链的订单分类进行分析,然后根据S公司通过预测模型得出的快速流动件月度需求预测数据来进行安全库存设置,并通过缩短采购间隔期和平均补货提前期来降低安全库存数而保持周期服务水平不变,对实际的售后配件管理工作有一定的指导作用。     

OEM电子产品备件服务项目的采购风险管理

OEM电子产品备件服务周期较长,需要供应链提供长期稳定的支持,特别是在量产停产后容易产生采购风险影响产品服务质量。文章通过分析OEM电子产品备件项目采购的特点,运用项目管理方法识别、评价采购风险,并提出风险应对策略,供企业在实际项目中进行参考。     

供应链渠道建设

根据近几年仲景医疗器械公司在几十种新产品投放市场后总结出的经验,新型产品在投放市场后可能会出现一段时间的供应短缺,描述这一问题的关键指标是该公司产品交货周期太长,形成的原因涉及采购订货提前期、生产和销售策略等多个方面的供应链物流管理。首先是仲景医疗器械公司零     

基于委托代理关系的备件采购管理

在委托代理的理论框架下,本文指出了备件采购中长期存在的采购提前期和备件质量问题实际是由于信息非对称造成的,备件采购过程实际上是非对称信息博弈的过程。同时,用委托代理关系来对备件的采购进行激励和约束设计,并提出基于报酬激励的备件采购数学模型。     

基于Kraljic模型的零件分类研究

以零部件制造企业的零件采购管理为研究背景,建立了零件采购定位模型指标体系,以Kraljic模型为基础,运用因子分析法,对收益影响和供应风险两个维度进行量化,提出了一种零件采购定位分类模型。通过应用实例,最终确定了理想的定位分类模型,提高了采购零件的有效性和效率,具有很强的可操作性和指导意义。同时,针对每个象限的零件提出了未来采购发展策略,可切实提高采购管理水平和管理成效。     

论BOM表运用EXCEL宏录制的应用技巧

BOM表运行在企业信息管理系统中,笔者介绍通过采用EXCEL表对BOM表进行事前的编排和检索,是事前对BOM表中的数据准确性进行检查的一项创新与尝试。     

Consequences of competitive bidding in project-based production

This paper discusses the consequences competitive bidding have on lead time in project-based production, such as construction. Earlier studies argued that competitive bidding may significantly increase resource consumption and generate waste in the delivery process, which this paper supports. However, the relation between competitive bidding and lead time has been less discussed. Lead time reduction has long been considered a fundamental objective for overall business improvement. An objective of our study was to understand what contributes to long lead times. The reported findings are from a 4-year study on the delivery process of power distribution equipment, a type of engineered-to-order (ETO) product. The paper concludes by suggesting procurement practices that reduce lead times for ETO products.     

An optimal multiple stopping approach to infrastructure investment decisions

The energy and material processing industries are traditionally characterized by very large-scale physical capital that is custom-built with long lead times and long lifetimes. However, recent technological advancement in low-cost automation has made possible the parallel operation of large numbers of small-scale and modular production units. Amenable to mass-production, these units can be more rapidly deployed but they are also likely to have a much quicker turnover. Such a paradigm shift motivates the analysis of the combined effect of lead time and lifetime on infrastructure investment decisions. In order to value the underlying real option, we introduce an optimal multiple stopping approach that accounts for operational flexibility, delay induced by lead time, and multiple (finite/infinite) future investment opportunities. We provide an analytical characterization of the firm׳s value function and optimal stopping rule. This leads us to develop an iterative numerical scheme, and examine how the investment decisions depend on lead time and lifetime, as well as other parameters. Furthermore, our model can be used to analyze the critical investment cost that makes small-scale (short lead time, short lifetime) alternatives competitive with traditional large-scale infrastructure.     

Housing, credit, and real activity cycles: Characteristics and comovement

This paper describes the characteristics and comovement of cycles in house prices, residential investment, credit, interest rates, and real activity in advanced economies during the past 25 years. Stylized facts and regularities are uncovered using a dynamic generalized factor model and spectral techniques. House price cycles are found to lead credit and real activity over the long term, while in the short to medium term the relationship varies across countries. Interest rates tend to lag other cycles at all time horizons. Although global factors are important, the US business cycle, housing cycle and interest rate cycle generally lead the respective cycles in other countries over all time horizons, while the US credit cycle leads mainly over the long term.     

New technology—what new jobs?

Does technological innovation lead to an overall reduction in jobs? The literature of Kondratiev ‘long waves’ helps in understanding why the employment consequences of technical change may vary over time. This article applies the technique of ‘technological mapping’ in the context of ‘long wave’ arguments to indicate prospects for the longer term employment.     

一类汽车需求链的分析与快速响应系统设计

以某汽车厂商与其一级经销商组成的汽车需求链为研究对象,在分析该汽车整车需求链的物流流程、物流成本、市场需求、产销流程等现状的基础上,为该汽车需求链量身设计了一套快速响应系统以解决目前需求链中的提前期过长和库存成本过高的问题,进而实现提升该需求链利润和竞争力的目标。     

The cost of inflated planned lead times in MRP systems

Much of the current literature in the field of production and inventory control systems stresses the need to revise traditional forms of thinking regarding production processes, the role of inventories for work in process, and the need for reduced lead times or flow times. Group technology, manufacturing cells, and other means of incorporating repetitive manufacturing techniques into traditional job-shop settings constitute the leading edge in system development.Still, there is resistance to these dramatic changes, and traditional “business as usual” methods still predominate. This study attempts to illustrate graphically the cost justification associated with reduction in lead times which generally results from these new concepts. In most job shops today, lead times are much longer than they need to be due to inflation of lead time estimates. Actual lead times for the manufacture of fabricated and assembled products have been shown to be a direct consequence of the planning lead times used in the MRP planning process—a form of self-fulfilling prophesy.The research employs a simulation model of a factory using MRP as a planning tool in a multiproduct, multilevel production environment. Manufacturing costs constitute the dependent variable in the experiments, defined as the sum of material costs (including expedite premiums), direct labor costs (including overtime premiums), inventory carrying costs, and overhead costs. The independent variable being manipulated is the planned lead time offset used in the MRP planning process. Twenty values of planned lead time are evaluated ranging from a value that includes no slack time at all (pure assembly line) up to a value that allows 95% slack (queue) time which, unfortunately, is not uncommon in many job shops today. Stochastic variables in the model include customer demand and actual processing times—the sum of set-up and run times.The result of the study is a cost curve formed over the range of independent lead time variables that is constructed using nonlinear regression techniques. The conclusions from the resultant graph clearly indicate the cost consequences of long lead times, with exponential cost increases beyond the 80–90% queue time level. Total costs are 41% higher at the maximum lead time allowance compared to the minimum. Clearly, this study demonstrates the need for lead time reduction, either through downward adjustment of MRP planned lead times or by introducing new manufacturing concepts.     

Industrial organization and the evolution of concepts for strategic planning: The new learning

This paper reviews the parallel development of the disciplines of corporate strategy and industrial organisation. Recent developments in industrial economics suggest that the two may be about to merge, or at least be capable of synergy. This potential advance has come about because of the movement of industrial organisation theories towards dynamics and away from static concepts such as the traditional structure: conduct: performance model. Simultaneously, corporate strategists, who have always been dynamically oriented, have long been in search of the more sophisticated theories industrial economists have in their tool kits.     

Queue control using a historically developed stochastic model

This paper applies a stochastic model to determine the optimal or ideal average planned queue level. The ideal average planned queue level is defined to be the minimum average queue level necessary to ensure that in the long run the probability of work center idle time over a specified planning horizon is no greater than some value α chosen by management. Also discussed is the usefulness of the ideal planned queue level, not only for controlling work-in-process inventories, but also for obtaining better work center lead time estimates.     

一种基于集合的Web用户会话实时聚类算法

随着互联网的普及和电子商务、个性化推荐技术等的发展,Web使用挖掘成为了数据挖掘的新的研究热点。针对Web用户会话聚类,提出了一种基于序列对集合的用户会话实时聚类方法。对聚类算法进行了分析与比较,给出了时空复杂度,实验比较了BOM算法与BOC算法的效率,并验证了BOC算法的有效性与时效性。