Sociological Models Based on Fréchet Random Variables

Products of random variables are of both practical and theoretical significance to social scientists. This has increased the need to have available the widest possible range of statistical results on products of random variables. In this note, the distribution of the product XY is derived when X and Y are independent Fréchet random variables. Extensive tabulations of the associated percentage points are also given.     

Determining the optimal process means under mixture normal distributions

In this paper, we consider that the working environment has certain states, and in every state, the parameters of quality characteristics are different. Thus, if we set the characteristics parameters in a specified state, these parameters will change to another state. To describe this situation, we use a mixture of normal distributions, which comprise a flexible and powerful statistical-based modeling tool in practice. Under the step loss function and the piecewise linear loss function, we select the optimal means for the proposed manufacturing process.     

A unified approach to bivariate discrete distributions

Here we introduce a bivariate generalized hypergeometric factorial moment distribution (BGHFMD) through its probability generating function (p.g.f.) whose marginal distributions are the generalized hypergeometric factorial moment distributions introduced by Kemp and Kemp (Bull Int Stat Inst 43:336–338,1969). Well-known bivariate versions of distributions such as binomial, negative binomial and Poisson are special cases of this distribution. A genesis of the distribution and explicit closed form expressions for the probability mass function of the BGHFMD, its factorial moments and the p.g.f.’s of its conditional distributions are derived here. Certain recurrence relations for probabilities, moments and factorial moments of the bivariate distribution are also established.     

发展黑龙江省专业物流中心对策

“十一五”黑龙江省将加快发展与培育专业物流服务企业,即实施放宽市场准入,逐步取消对物流企业经营范围的限制,促进现有运输、仓储、货代、批发、零售企业的服务延伸和功能整合．加快传统物流企业向现代、专业化物流企业的转变的相关政策。文章从黑龙江省物流服务企业的发展角度出发．从地理位置、物流服务条件、人才、信息平台、理论研究等方面阐述黑龙江省物流行业的基本发展现状,并对未来的发展趋势在专业化、现代化、社会化、多元化等综合思想的指导下．提出了关于机制、运行、改进、变化、人才、信息等各方面的对策建议。     

配送中心车辆调度模型及遗传算法设计

针对物流配送中心车辆调度问题,采用混合整数规划方法进行建模。对实际问题进行研兖分析后,基于所研究问题的特点,提出基于遗传算法的求解方法。通过数值实验对算法不同参数组合进行分析、比较,获得最佳参数组合．建立了有效的求解该问题的遗传算法。并通过对实际问题的数值仿真试验．验证了算法的有效性。     

利用层次分析法合理布局企业网点

随着中国市场的逐渐成熟、完善,更多的外企带着自己的产品来到中国,同时市场的竞争也更加剧烈。企业要不断加强售后服务、物流配送、供货周期等各个环节,增加自己产品的市场竞争力,合理布局企业网点至关重要,文章通过层次分析法讨论如何在国内个城市进行合理布局,以在物流配送、供货周期上实现最大的竞争力。     

美军配送式后勤保障对我军后勤建设的启示

阐述了配送式后勤的基本涵义,系统运行过程及其基本特征,并从后勤信息化装备建设、社会化后勤保障、后勤体制建设以及观念的更新等方面分析了美军配送式后勤保障给我军后勤建设带来的思考和启示。     

我国医药物流发展现状及其模式选择

首先分析了我国医药物流目前存在的突出问题,然后通过总结现代医药物流的基本特征,提出了我国医药物流模式选择的思路。通过普洛斯、南京医药和美国麦卡森公司的实际案例,总结了三种先进的现代医药物流模式。最后提出了发展现代医药物流时应该注意避免的三点误区。     

黔东南山区卷烟配送管理模式研究与应用

在分析我国现有山区卷烟配送管理模式的基础上,通过黔东南具体实例,阐述了山区卷烟配送管理模式的研究内容和设计过程,为企业提高山区卷烟配送效率,降低配送成本起到一定指导作用。     

物流配送中心工作流程的建模与仿真

根据配送中心的作业特点,分析了物流配送中心基本组成和作业流程,将物流配送中心剖析为进货、存储、流通加工、分拣、出货子系统,应用赋时着色Petri网(TCPN)对配送中心系统进行建模.通过对配送中心系统进行计算机仿真,找出了该系统在作业过程中的"瓶颈",提出了资源和流程的改进措施.