X配送中心拣选作业时间的计算

借鉴数学模型法的思想,结合秒表时间研究的方法,对x配送中心的拣选作业进行研究,提出了拣选作业各个作业单元时间的确定方法以及拣选作业总时间的计算方法.最后,通过实例计算和仿真验证证明利用该方法可以准确、有效地求得配送中心拣选作业时间.     

基于Flexsim的配送中心拣选作业系统仿真与优化

本文研究了Flexsim仿真在配送中心拣选流程优化问题上的应用。以某电商物流配送中心为研究对象,建立基于Flexsim软件的仿真模型,实现了该配送中心从接受订单到到人员拣取、分货、直至拣选完成的一系列作业流程模拟,最后根据仿真运行结果总结作业系统瓶颈问题,提出拣选作业流程优化方案。     

物流配送中心拣选作业的人因工程量化评估

基于人因工程视角,探究电子商务模式下新兴的物流配送中心拣选作业的工程负荷与职业健康,研究选取能量代谢量、心率等指标,量化物流拣选作业环节的劳动强度等级,并利用疲劳强度评估提出合理的作息安排,即当劳动负荷为5km/h时,物流拣选劳动者平均每工作48min后,需要休息6min;当劳动负荷为7km/h时,物流拣选劳动者平均每工作19min后,需要休息6min。该研究拟在改善电子商务模式下物流配送中心衔接不紧密、响应速度慢等瓶颈问题的同时,关注劳动密集型作业环节的工程负荷与职业健康。     

物流配送中心的系统仿真

由于物流配送中心的作业流程比较复杂，系统仿真已经成为物流配送中心设计中的一个重要工具。配送中心仿真涵盖了管理调度策略、作业过程、布局与设备配置等多个层面。正确的仿真目标、合理的系统建模以及正确的仿真实施步骤是保证仿真分析结果可靠的前提条件。本文结合配送中心设计咨询项目，介绍了如何用仿真方法分析关键设备利用率和主要工艺流程，并提出了改进物流配送中心仿真方法的建议。[编者按]     

萨克斯树立配送中心越库作业典范

物流系统集成商德马泰克在了解了萨克斯的具体需求后,为其配送中心规划了越库作业模式.首先从物流系统设计入手,然后萨克斯再设计配送中心的建筑,将整个自动化物流系统包裹起来.     

配送中心作业时间测定研究

首先把配送中心作业分解成作业单元,针对不同特征的作业单元,采用相应的作业时间测定方法,然后通过求均值、建立数学模型等方法把配送中心各个作业时间定量化.综合应用各种作业时间测定方法对配送中心作业时间进行分析研究,使得配送中心作业时间的确定更加准确,从而更加合理地制定工时定额,使作业均衡化,更合理地安排作业人员,从而减少配送中心作业人员数量.     

德邦物流公司配送中心作业流程优化研究

本文就德邦物流公司配送中心作业流程进行分析,找出作业流程中的问题并就相应的问题提出相应的对策,以求优化德邦物流公司配送中心作业流程。当然只有拥有了专业化的配送流程,才能够创造出最大的企业效益与经济效益。     

图书配送中心物流流程及作业模式研究

近两年由于经济发展的需要,我国政府都将物流视为经济发展的重要政策。企业领导亦将物流发展作为经营的重要指标,企图以现代化物流的手段,改善企业经营体质,符合现代化经营管理的需求,大幅提升企业的竞争能力。图书行业自然也不例外,现代的物流设施、优化的物流流程和先进的物流管理,都是帮助企业提高效率、节约成本的重要途径和手段。     

果蔬配送中心物流作业建模与仿真研究

果蔬类配送中心作为果蔬类农产品物流周转的枢纽,对果蔬类农产品在物流过程中的存储、保鲜、流通加工、配载等环节有着重要影响。通过分析物流配送中心的运作过程,应用W itness仿真软件构建果蔬类农产品配送中心的仿真模型,利用仿真方法检验配送作业方案的可行性和适用性,从仿真输出结果中找出方案中存在的不足之处,再予以改进,可以使配送中心的作业效率提高到一个新的水平。     

物流配送中心作业流程的统筹优化

针对配送中心作业流程的合理规划问题,对配送中心的作业时序进行分析,寻找每道工序的时差,运用统筹方法中的关键路线法寻找缩短工期的最优方案,建立线性规划模型,计算出最佳作业时序,实现配送中心内部作业优化问题,降低配送中心的运营成本。     

Indirect productivity measurement

Caves, Christensen and Diewert [1982a] showed that the Törnqvist productivity index is superlative in a considerably more general sense than had been previously believed. We examine the allocative and technical efficiency hypotheses on which their finding rests. We show that the allocative efficiency hypothesis can be modified, which makes the Törnqvist index superlative in a wider sense than even Caves, Christensen and Diewert showed, since it is consistent with a type of allocative efficiency other than the standard cost minimization and revenue maximization hypotheses considered by Caves, Christensen and Diewert. We also show that if the technical efficiency hypothesis is relaxed, the CCD result may no longer hold, and the distance functions that form the basis of the Malmquist productivity indexes, and hence of the Törnqvist productivity index, must be calculated. We then show how to calculate the underlying distance functions, and we argue that there are real advantages to doing so.The refereeing process of this paper was handled through N.R. Adam.     

Cost and productivity

This study develops an analytical model capable of decomposing both intertemporal and multilateral cost variation. It begins by attributing cost variation to a price effect and a quantity effect. Then the quantity effect is decomposed into a productivity effect and an activity effect. The productivity effect in turn decomposes into a cost efficiency effect and, in the intertemporal context, a technical change effect. This paper also shows how the intertemporal and multilateral cost decompositions can be implemented, using linear programming techniques. These techniques offer certain advantages over conventional econometric techniques whenever a substantial portion of cost variation is due to variation in cost efficiency. The two cost decompositions are illustrated with a pair of benchmarking exercises based on a panel of 93 US electric power generating companies, in which variation in cost efficiency does play a key role. Copyright © 2000 John Wiley & Sons, Ltd.     

Stochastic productivity measurement

Stochastic productivity indicators are defined, and superlative measures of these indicators are derived. It is shown that, in the presence of complete markets or a common-expectations equilibrium, differences in the market values of firms are superlative indicators of cross-sectional productivity differences. Exactness results are used to decompose nonstochastic productivity indicators into a measure of true productivity change and a measure of ‘luck’. The decomposition is illustrated empirically.

The productivity crisis

Productivity shouldn't be taken for granted, even in a country like the United States. To prevent the kind of serious mistakes that have been made in England, all levels of industry, capital, management, and labor, must be motivated toward productivity.     

Infrastructure and productivity: An extension to private infrastructure and it productivity

This paper incorporates both public and private infrastructure within the framework of a nonlinear production function. The theoretical model specifies a technological growth rate as a nonlinear function of government infrastructure and private infrastructure generated by the information sector of the economy—cable, wireless stations, satellites, internet facilities, broadcasting, etc. The time trend is included to capture the effect of all other variables. The empirical estimates generated by the model imply increasing returns to scale for the US economy in the last few years. The evaluation of the growth accounting equation implies that information technology was the largest contributing component to growth during the expansion of the 1990s.     

Problems with (dis)aggregating productivity,and another productivity paradox

Using a standard definition of productivity growth, it is shown that a country may have higher productivity growth than another country in each sector, but may have a lower productivity growth rate overall. Also, it is shown that popular methods for aggregating firm/industry estimates of productivity growth have a serious problem in that productivity of all firms/industries can go up, but aggregate productivity can fall. This is not necessarily due to changes in the reallocation of resources across firms/industries. Hence, there are problems for the interpretation of previously published articles which use these methods. There can be inappropriate assessments of the cyclical properties of productivity, and the productivity impact of industry dynamics, micro-economic reforms and regulatory change. Index-number methods that avoid these aggregation problems are introduced.     

Productivity agreements and productivity

The effectiveness of productivity agreements as an agency for increasing productivity would be greatly enhanced by approaching the production process as a highly complex “system”, instead of assuming a simple relationship between labour effort and higher productivity.