Some characterizations of distributions of the exponential-type

We consider a particular subclass of the two-parameter exponential family with natural parameters γ₁, γ₂ and characterize those distributions of the family having a ratio of the mean value and the variance that is a linear function of γ₁ by the form of the moment generating function. As special cases we find the normal and the gamma distributions.     

组合拍卖与议价谈判机制设计研究

设计了一种先组合拍卖再议价谈判的多物品出售两阶段机制.论文分析表明,机制的组合拍卖阶段保持了VCG机制的激励相容性质,在机制的议价谈判阶段,存在4种不同类别的获胜投标者,就拍卖者将采取的不同价格策略,可将其区分为第1类投标者和第2类投标者.据此,找到了拍卖者采取不同价格策略的相应条件.给出了该机制中拍卖者与任意获胜投标者之间的博弈均衡路径.就买卖双方的总估价而言,存在不同相对关系下的不同交易结果.对比该机制和经典VCG机制,该机制改进社会交易福利值为:第1类投标者在议价价格和VCG价格下带给拍卖者利润的变化值.此结果表明,该机制的社会交易福利优于经典VCG机制.     

A Flexible Evaluative Framework for Order Picking Systems

This paper develops a novel framework to evaluate the integral performance of order picking systems with different combinations of storage and order picking policies. The warehousing literature on order picking mostly considers minimizing either elapsed time or distance as the sole objective, whereas warehouse managers in a supply chain have to look beyond single‐dimensional performance and consider trade‐offs among different criteria. Thus managers still need a unified and efficient framework to select a portfolio of appropriate order picking policies from a multi‐criteria and contextual perspective. Our framework—combining data envelopment analysis, ranking and selection, and multiple comparisons—provides an efficient methodology to simultaneously analyze several interrelated problems in order picking systems with multiple performance attributes, such as service levels and operational costs. We demonstrate our approach through comprehensive evaluations of order picking policies in three low‐level, picker‐to‐parts rectangular warehouses facing demand variations.     

手绘表现在艺术设计中的运用

手绘设计草图是电脑设计不可替代的设计表现形式,手绘设计草图的学习是学生提高设计能力的一个关键因素,在现今艺术院校设计专业学生的系统学习中应加强快速手绘草图的训练,并对其技法进行探索和总结。     

日本的《道具论》与中华之"道"--浅谈日本集团的设计理念

文章通过日本学者所提出的<道具论>,重新认识中国固有之"道器"论,试用中华古老之"道",诠释与丰富日本现代之"道具论",并强调引进"道具论"充实现代工业设计理论.     

The Dynamic Pivot Mechanism

We consider truthful implementation of the socially efficient allocation in an independent private‐value environment in which agents receive private information over time. We propose a suitable generalization of the pivot mechanism, based on the marginal contribution of each agent. In the dynamic pivot mechanism, the ex post incentive and ex post participation constraints are satisfied for all agents after all histories. In an environment with diverse preferences it is the unique mechanism satisfying ex post incentive, ex post participation, and efficient exit conditions. We develop the dynamic pivot mechanism in detail for a repeated auction of a single object in which each bidder learns over time her true valuation of the object. The dynamic pivot mechanism here is equivalent to a modified second price auction.     

e-SCM系统的收益测算机制设计

作为供应链管理(Supply Chain Management,SCM)的支持手段,e-SCM系统(electronic Supply Chain Management System)的投资滞后成为制约SCM实现的重要障碍。本文借助Preinreich-Luecke定理、相对直接成本以及作业成本法所提供的理论框架,设计了简便易行的e-SCM系统收益测算机制,将其作为e-SCM系统投资决策的先导和收益实现的重要基础。本文的主要结论是:仅当业绩量的成本来源具有可变特质时,e-SCM系统所带来的业绩量才会产生经济收益,以库存为核心的资金占用成本因而成为业绩额的主要来源。仅需提取企业少量运营数据即可进行e化收益测算,客观上增加了测算的可行性。     

Design of Stockless Production Systems

In make‐to‐stock production systems finished goods are produced in anticipation of demand. By contrast, in stockless production systems finished goods are not produced until demand is observed. In this study we investigate the problem of designing a multi‐item manufacturing system, where there is both demand‐ and production‐related uncertainty, so that stockless operation will be optimal for all items. For the problem of interest, we focus on gaining an understanding of the effect of two design variables: (i) manufacturing speed—measured by the average manufacturing rate or, equivalently, the average unit manufacturing time, and (ii) manufacturing consistency—measured by the variation in unit manufacturing times. We establish conditions on these two variables that decision makers can use to design stockless production systems. Managerial implications of the conditions are also discussed.