带有能力约束的大规模联合补货问题研究

文中研究求解带有能力约束限制的大规模联合补货问题。在订货网络中,通过聚类算法将问题规模缩小至一定范围内,使算法在该范围内具有良好的表现;其次,在问题的模型中,考虑转运中心的能力限制,保证在任何订货周期内不出现超出转运中心能力负荷的情况;第三,通过改进经典RAND算法,引入拉格朗日乘子,求解模型,所优化的目标为总费用最小化和求解速度质量的平衡。最后根据数值算例验证策略有效性。     

Measurement of development and regional disparities in Greek periphery: A multivariate approach

The identification of regional disparities and regional growth patterns is an important factor affecting policy formulation. Single indicator, usually GDP-based, approaches have revealed significant shortcomings. In this work we provide a methodology and the respective tools to analyse regional disparities and development patterns. Aiming at capturing the different aspects of development and quality of life our approach is multi-dimensional: we, first, develop a composite index; we, then, apply multivariate clustering for identifying regions with similar socio-economic profiles. The methodology is applied to examine Greek regions. The results do not provide strong evidence for convergence of Greek regions during the period 1995–2007.     

我国能源生产率的地区划分及影响因素分析

能源生产率状况以其对能源消费量的重要影响而引起了国内外理论界的广泛关注。本文整理了我国各个省区1995～2003年的数据,并以此为基础来研究这些省区能源生产率的分类情况及差别原因。通过聚类分析,本文将各省划分为能源高效区、中效区和低效区三类,并利用面板数据计量分析了经济发展水平、产业结构、投资情况以及能源价格等因素对能源生产率的影响。     

泛珠三角战略:湖南的定位与发展

\"泛珠三角\"区域合作是区域经济一体化的必然结果,具有重大的战略意义.湖南作为中部内陆省份,在东西部相继崛起的双重夹击下,如果不抓住机遇迅速融入\"泛珠三角\"经济圈,尽快找到突破口,就难以改变落后的被动局面.湖南必须用深远的战略眼光来考察发展全局,以积极的姿态主动地参与\"泛珠三角\"区域经济合作,发挥优势,扬长避短,突出产业重心,坚持实施\"核心城市极化、产业集群化、企业集团化\"的发展战略,更进一步地推进湖南的现代化进程.     

基于最小生成树的超度量聚类的若干金融案例分析

本文介绍了基于最小生成树的超度量聚类方法,并应用该方法做了两个案例：一是对2007-2008年全球金融危机中世界主要国家的股指进行了实证分析。揭示了金融危机在全球传递的特征和全球股市的内在结构;二是对股指期货上市前后的中国期货市场交易品种进行了实证分析,揭示了期货市场的内在结构。     

红军长征沿线城市旅游竞争力及提升策略研究

依据红军长征沿线经过地区32个主要城市的实际发展状况,从城市旅游基础设施、城市旅游发展现状和城市旅游生态环境三个方面选取26个评价指标,运用SPSS19.0主成分分析和系统聚类分析方法测算各城市的旅游竞争力得分、排名和系统聚类分析树状图,对城市间旅游竞争力进行比较分析、分层分析。结果表明:长征沿线城市旅游竞争力整体呈现出东部优于西部,沿海优于内陆,地区中心城市优于边缘城市的特点;长征沿线主要城市旅游综合竞争力存在明显的区域增长极结构,重庆为一级增长极,杭州为二级增长极,昆明为三级增长极,表明沿线城市旅游发展差异明显;城市旅游竞争力中间水平及以上共有12个城市,其余20个城市旅游竞争力较弱。结合城市旅游发展不足,提出旅游竞争力提升策略。     

Rational drug design, the knowledge value chain and bioscience megacentres

This paper seeks to trace important shifts and cluster evolutionin the healthcare industry. Its key aim is to examine the implicationsof the rise of science-based clusters for economic geographyand related policies. A special focus is biosciences and therise of ‘biologics’ more generally at the expenseof fine chemistry in drug development. The old agglomerationsof pharmacy are no longer leaders in knowledge exploration,as universities, research laboratories and medical schools takeover research, they are beginning to lose prominence to dedicatedbiotechnology firms (DBFs) in knowledge examination, and retaintheir most important involvement as financiers and marketersof DBF exploitation knowledge. This has profound geographicalas well as industry organisation equilibrium effects. Over-concentrationof the bioscientific knowledge value chain has given rise tothe new spatial policy practice of developing regional sciencestrategies. Aspects of these are commented upon.     

A comparative study to classify ICT developments by economies

Information and communication technology (ICT) attracts more and more attention as the diffusion of Internet grows rapidly. This study intends to classify ICT developments by using a different approach: a clustering technique to classify the economies with only two essential variables, namely the number of Internet subscribers and gross domestic product. This study performs a comparative analysis for 121 economies covering the period from 1999 to 2007. Then, this study validates classification results against the research results in previous studies and finds the proposed approach more effective. The classification results help to explain the global ICT developments.