一种基于佳点集遗传算法的物流配送网络优化

首先根据实际问题分析了物流配送网络优化模型的各个关键组成部分,包括优化目标、决策变量和约束条件,并针对目前物流配送网络优化算法中存在的一些问题提出了一种新的算法,其核心是佳点集遗传算法。该算法编码采用prufer num ber结构,变异和交叉概率自适应选择。     

需求势能理论在多级物流网络预选点中的应用

针对分销物流网络的特点,提出了基于服务时限的多级物流网络选址问题和选点思路,应用需求势能理论建立了多网点选址数学模型,并提出了详尽的求解方法和步骤。最后通过医药分销物流网络系统的实例分析,说明了该方法在网络选点过程中的模型化方法和求解步骤。     

地区综合实力的ANN分析

人工神经网络通过神经元之间的相互作用来完成整个网络的信息处理，具有自学习和自适应等一系列优点，因而用它来评价地区综合实力是可行的。针对地区综合实力评价问题，建立了基于神经网络的评价系统，给出了应用实例。     

Tax Effects in a Model of Product Differentiation: A Note

We investigate how unit (or specific) tax and ad valorem tax affect equilibrium location choice in a model of product differentiation, which includes Hotelling (linear-city) and Vickrey-Salop (circular-city) spatial models as special cases. We find that neither tax affects equilibrium location patterns as long as each firm has the same production cost. Two taxes can yield different location patterns under cost heterogeneity among firms.     

Two-settlement Systems for Electricity Markets under Network Uncertainty and Market Power

We analyze welfare and distributional properties of a two-settlement system consisting of a spot market over a two-node network and a single energy forward contract. We formulate and analyze several models which simulate joint dispatch of energy and transmission resources coordinated by a system operator. The spot market is subject to network uncertainty, which we model as a random capacity derating of an important transmission line. Using a duopoly model, we show that even for small probabilities of congestion (derating), forward trading may be substantially reduced, and the market power mitigating effect of forward markets (as shown in Allaz and Vila 1993) may be nullified to a great extent. There is a spot transmission charge reflecting transportation costs from location of generation to a designated hub whose price is the underlying for the forward contract. This alleviates some of the incentive problems associated with the forward market in which spot-market trading is residual. We find that the reduction in forward trading is due to the segregation of the markets in the constrained state, and the absence of natural incentives for generators to commit to more aggressive behavior in the spot market (the strategic substitutes effect). In our analysis, we find that the standard assumption of no-arbitrage across forward and spot markets leads to very little contract coverage, even for the case with no congestion. We present an alternative view of the market where limited intertemporal arbitrage enables temporal price discrimination by competing duopolists. In this framework, we assume that all of the demand shows up in the forward market (or that the market is cleared against an accurate forecast of the demand), and the forward price is determined using a market clearing condition.     

技术创新扩散环境的BP神经网络评价模型研究

构建了技术创新扩散的环境评价指标体系,设计了BP神经网络评价模型,并将二者结合,运用实例验证了该模型的有效性,从而为技术创新扩散环境的评价提供借鉴。     

产业集群的区域创新网络系统分析

区域创新是一个区域获得可持续发展的根本动力,区域创新能力正日益成为区域经济获取国际竞争优势的决定性因素和区域经济具备竞争优势的重要标志。作为区域经济重要形态的产业集群,以其显著的网络特性成为区域创新系统的理想处所,而构建区域创新系统已经成为各区域实现快速发展的战略选择。本文从产业集群出发,研究创新网络系统的构成及其运行机制,并提出了构建区域创新网络系统的几点思路。     

Strategic Environmental Standards, Wage Incomes and the Location of Polluting Firms

The purpose of this paper is tostudy how the choice of environmental standardsby governments is affected by the existence ofwage incomes when firms locations areendogenous. In developed countries labor isunionized, which allows positive wage incomesto arise. Thus, each government has incentivesto persuade firms to locate in its countrysince social welfare depends on suchincomes. But, as pollution damages theenvironment, each government will only try toattract polluting firms to thecountry, to obtain the wage incomes, whenthe valuation of environmental damage showsthat it is low.     

基于小波神经网络的企业技术创新能力模糊综合评价

在对企业技术创新能力系统进行分析的基础上,建立了企业技术能力评价指标体系并提出了基于小波神经网络的综合评价方法,采用模糊综合评价法生成评价样本集。仿真试验表明该方法用于企业技术创新能力综合评价的有效性与准确性,为企业技术创新能力的评价研究提供了一种新的模型。     

区位势及其BCM估计模型

区位要素的空间聚集形成了区位势，区位势的高低决定了厂商的盈利能力和竞争力，而人们选择理想区位过程中对区位势的判断却受到各种区位因素的影响。BCM估计模型正是在区位因素定性和定量分析相结合的基础上建立起来的区位势估计模型，有助于人们科学选择产业区位。