基于引力模型的中美农产品贸易边境效应研究

针对中美两国在农产品贸易上的新变化,应用引力模型的派生模型——边境效应引力模型对中美两国农产品贸易的流量和流向进行理论和实证研究。首先介绍了边境效应引力模型基本模型的推导过程,并引入了调整模型。然后采用1987至2005年其中5年的截面数据进行计算,结果发现:中美农产品贸易的边境效应显著存在,且呈逐年下降趋势;两国之间的农产品贸易边境效应存在流向和区域上的差异;距离的平方并不影响模型的可靠性。     

Vacancies and Rent Dispersion in a Stochastic Search Model with Generalized Tenant Demand

I model imperfect information, derive a downward sloping market demand curve, and explain vacancies in a partial equilibrium model of a rental housing market. Tenants can be completely described by an exogenous demand curve, perhaps arising from differences in income, preferred location, or tastes, and view vacant units based on a stochastic arrival of rental information. Free entry of these landlords induces excess rental housing capacity (equilibrium vacancies). I determine the equilibrium distribution of rents for vacant units, show that this rent distribution may be discontinuous, and explore the equilibrium vacancy rate to changes in exogenous parameters. The resulting characterization of equilibrium distributions of rents may be amenable to econometric modeling exploring the relationship between market rents and vacancies.     

我国现代物流发展的几点对策分析

科学技术的迅速发展和信息技术的普及应用，消费需求个性化趋势的加强；竞争机制的建立，使得我国工商企业特别是中外合资企业，为了提高竞争力不断提出了新的物流需求。本文立足这一实际，对现代物流的发展提出一些新的看法，以期提供可行性的借鉴。     

物流配送实时监管系统设计

随着近年流通领域的发展,尤其是电子商务对现代物流的要求,物流配送需要现代化的信息技术已越来越成为人们的共识,如何对物流配送系统和配送中心进行现代化建设,已成为不少物流配送公司的重要课题。针对目前物流配送中“不可见部分”和过程无法控制的现状,论文设计了一个物流配送实时监管系统来满足物流配送企业和客户的需求。     

上市公司股利分配现状及对策研究

本文分析了我国上市公司股利分配的现状及存在的主要问题,并深入地剖析了这些问题产生的原因。在此基础上,从内部规范和外部规范两个方面提出改进我国上市公司股利分配的对策,以其对发展与完善我国资本市场提供帮助。     

现金制与应计制财务报表有用性的问卷调查分析

中国的《企业会计准则——现金流量表》要求所有企业从1998年开始编制现金流量表，它克服了传统财务报表所体现的、与应计制会计确认和计量程序相关联的局限性。但是现金流量表、资产负债表和利润表的决策有用性是否存在差异，还缺乏经验证据。本文设计调查问卷，要求财务报表使用者在21种决策背景下封三大报表的有用性追行评级。结果表明，现金流量表在许多决策背景下可以与利润表和资产负债表相媲美，而在以下决策背景下，现金流量表的评级大大高于其他两张报表：评价流动性，评价短期偿债能力，评价支付股利的能力，评价净利润的质量，突出净利润与现金余额之间的差异，预测财务危机，以及预测未来现金流量的金额与时间。     

基于Agent的物流配送决策支持系统研究

物流配送是一个涉及多种影响因素的综合性复杂问题。本文探讨了基于Agent(智能体技术)的物流配送决策支持系统设计，在该系统中的智能体模型中引入学习机制，初步建立了一个具有专家系统特点、可以不断进化的物流配送决策支持系统。     

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.