A new continuous distribution and two new families of distributions based on the exponential

Recent work on social status led to derivation of a new continuous distribution based on the exponential. The new variate, termed the ring(2)-exponential, in turn leads to derivation of two closely related new families of continuous distributions, the mirror-exponential and the ring-exponential. Both the standard exponential and the ring(2)-exponential are special cases of both the new families. In this paper, we first focus on the ring(2)-exponential, describing its derivation and examining its properties, and next introduce the two new families, describing their derivation and initiating exploration of their properties. The mirror-exponential arises naturally in the study of status; the ring-exponential arises from the mathematical structure of the ring(2)-exponential. Both have the potential for broad application in diverse contexts across science and engineering. Within sociobehavioral contexts, the new mirror-exponential may have application to the problem of approximating the form and inequality of the wage distribution.     

物流配送系统中的运筹学问题及方法研究

物流配送系统中包含诸多运筹学问题,如配送中心选址中的0-1规划问题,货物配载中的背包问题,配送路线优化中的动态规划问题等,通过建立数学模型,利用运筹学方法与信息技术的结合可对上述问题加以解决,为配送业务的进一步发展提供帮助.     

Characterizations of negative multinomial distributions based on conditional distributions

In this paper characterizations of negative multinomial distributions based on conditional distributions have been studied.     

基于GIS的配送车辆调度系统的设计与实现

本文分析了物流配送与GIS的特点和功能，简要介绍了我们所设计开发的基于CIS的配送车辆调度系统。     

发展我国零售业态下的共同配送模式——日本7-11便利店物流革新的启示

日本7-11便利店在物流革新中开创了共同配送的新型配送模式,提高了配送效率,并成为其取得成功的关键因素之一.现阶段有三种典型的共同配送模式：集中配送模式、窗口批发模式、完全统一配送模式.鉴于我国零售业物流配送存在物流成本高、社会成本高、运输的规模不经济等问题,需要大力发展共同配送模式,以提高我国零售业物流配送效率.在我国零售业态下具体实行何种共同配送模式,可依据选择共同配送模式的决策参考模型,并结合具体情况做出决定.     

进入权理论下的会计师事务所股权设置

Rajan和Zingales提出了进入权理论，认为企业的权力来源于进入权，即对关键资源接触和使用的权力。本文结合会计师事务所的特征，在分析其关键资源的基础上，建议会计师事务所的股权应设置为财产股、岗位股、贡献股。     

区域性物流园区布局方案优选的博弈研究

本文基于区域物流理论与博弈论的理论基础，建立了相应的区域性物流园区布局方案的优选博弈模型，并列出了可行的计算步骤，做出了方法评价，指出了该方法后续研究的方向，为物流园区区域性总体布局的优选问题提供了一种解决方法。     

直接转运对供应链的影响和要求

随着供应链管理概念在企业的发展与应用．传统的配送战略在进一步降低物流成本和满足顾客需求上都受到了一定的挑战。本文从直接转运（cross-docking）的涵义和运作特征出发，分析直接转运对供应链中生产商、分销商或配送中心和零售商的影响，并总结直接转运给供应链带来的总体利益，提出供应链主要参与者在实施直接转运方式时，应该从配送中心布局、执行与控制、仓库管理系统、供应链信息沟通和供应链伙伴关系等方面来考虑，从而使直接转运的利益最大化，进一步促进供应链的整合。     

A new bivariate distribution in natural exponential family

We propose a new bivariate distribution following a GLM form i.e., natural exponential family given the constantly correlated covariance matrix. The proposed distribution can represent an independent bivariate gamma distribution as a special case. In order to derive the distribution we utilize an integrating factor method to satisfy the integrability condition of the quasi-score function. The derived distribution becomes a mixture of discrete and absolute continuous distributions. The proposal of our new bivariate distribution will make it possible to develop some bivariate generalized linear models. Further the discrete correlated bivariate distribution will also arise from an independent bivariate Poisson mass function by compounding our proposed distribution (Iwasaki and Tsubaki, 2002).Received March 2003     

基于中心灰靶决策模型的设备采购评标

设备采购评标是属于典型的多目标综合决策问题,利用中心灰靶决策模型并结合层次分析法进行设备采购评标,并给出评标实例。评标结果表明,基于中心灰靶决策模型的设备采购评标方法能有效地克服目前国内通常采用的评标方法的缺点,为设备采购评标提供了一种定量、客观的评标方法。