广东省生物医药产业集聚水平研究

本文利用 EG 指数和区位商对广东省生物医药产业的总体集聚水平和各地市的相对专业化水平进行了测度,并检验了区位商的统计显著性。研究结果表明：广东省生物医药产业的空间分布在总体上呈现出集聚发展的特征,有5个地区（广州、深圳、珠海、中山和佛山）的专业化水平大于1,其中广州、深圳、中山和珠海的区位商具有统计显著性。     

On tie breaking in competitive location under binary customer behavior

Ties in customer facility choice may occur when the customer selects the facility with maximum utility to be served. In the location literature ties in maximum utility are broken by assigning a fixed proportion of the customer demand to the facilities with maximum utility which are owned by the entering firm. This tie breaking rule does not take into account the number of tied facilities of both the entering firm and its competitors. In this paper we introduce a more realistic tie breaking rule which assigns a variable proportion of customer demand to the entering firm depending on the number of tied facilities. We present a general framework in which optimal locations for the old and the new tie breaking rules can be obtained through Integer Linear Programming formulations of the corresponding location models. The optimal locations are obtained for the old tie breaking rule for different values of the fixed proportion and a comparison with the results obtained for the new tie breaking rule is drawn with data of Spanish municipalities in a variety of scenarios. Finally, some conclusions are presented.     

小世界创新网络动态演化及其效应研究

低度、中度和高度开放的创新网络在创新集群创立和解体的动态演化过程中,其表现出的小世界性对创新绩效的效应有着较大差异． 创新绩效同创新网络小世界性间往往呈现倒U形关系,但该关系只在特定开放度下的创新网络演化到特定阶段才会显现: 低度开放的网络的小世界性同创新绩效的倒U 形关系在创新集群建立阶段显著,而在创新集群解体阶段不显著; 高度开放的网络则恰好相反; 在网络演化的其他阶段,小世界性对创新绩效并未构成显著影响． 这很可能是由于在创新绩效显著变化的阶段,创新个体的能动性较强,更倾向于接受新知识: 在低度开放的网络中,创新绩效显著上升的阶段主要集中于新的创新集群建立的阶段,而在高度开放的网络则主要集中于原有创新集群解体的阶段． 对中国专利合作发明数据的回归分析结果为该研究结论提供了实证依据． 因此,应当保持一个适度集聚的创新网络,以保证其不会传播过多冗余信息; 应在创新网络演化的不同阶段采用不同的开放策略,以充分利用高度和低度开放的创新网络演化到不同阶段所发挥的优势,同时,应当主动按照新兴技术下的新形势适当调整创新网络结构关系．     

Understanding public attitudes towards Social Security

There has been very little research on why individuals hold different attitudes toward Social Security. In this article we integrate social location theory and political predisposition theory to provide a framework of explanation and test these theories using a unique sample from the 1998 General Social Survey. Our multivariate results reveal that social structural positions along the lines of race, gender, class and age play a more important role than political predispositions in explain-ing individual differences in support for the current Social Security system against privatisation. Political party affiliation also partly contributes to variation in support for Social Security, but political ideology does not have a significant effect. Our results suggest that with regard to support for Social Security, primary consideration must rest on social structural positions. Racial minorities, women, the poor and the elderly tend to dislike a drastic change in the current Social Security system, and Social Security reform ought to pay attention to their concerns. Our robust finding of a positive relationship between age and support for Social Security also challenges much of the established knowledge, pointing to an intergenerational discord over Social Security. It is also important to differentiate among social welfare programmes in order to uncover the real determinants of public attitudes towards them.     

北京经济活动区位演变趋势分析

本文提出了未来北京经济活动区位的三个重要的演变趋势 ,这三个趋势是 :集聚与分散共存———未来北京经济活动空间分布的基本态势 ;办公业和写字楼———未来北京城区的重要行业和景观 ;园区化———未来北京产业布局的重要形式     

基于Moldflow的带金属嵌件打印机板浇口优化设计

针对带金属嵌件打印机板使用传统注塑模具设计方法时,存在开发周期长、成本高且质量不易保证等缺点,采用 计算机辅助设计软件Pro/E和有限元分析软件Moldflow相结合的方法对制品进行不同浇口位置方案下的“填充+保压 +翘曲”模拟分析,从充填时间、流动前沿温度、气穴、熔接痕和翘曲变形等方面进行了综合比较和评测,确定了最佳浇口 设计方案。结果表明,应用Moldflow软件进行模拟仿真,找出了制件在不同浇口设置环境下缺陷产生的原因,从而为避 免或消除制件上的缺陷,进一步优化模具设计、降低生产成本,为指导实际生产提供合理的依据。     

两个有限群子群指数之集相等的几个充分条件

讨论了子群指数之集的性质以及给出了两个有限群子群指数之集相等的充分条件.     

势能模式与内江市区位优势研究

运用潜能模式建立了城市区位优势比较的定量化模型，并对内江与绵阳、乐山的区位势能值进行了计算与比较．结果表明，内江的区位势能值明显高于划入成都平原经济圈的绵阳、乐山．由此得出结论：内江市具备四川省优先开发的区位优势条件．     

城市仓储型物流企业区位选择——以嘉里大通物流广州分公司为例

城市仓储型物流企业区位选择是一个复杂问题，是内部因素和外部因素共同作用的结果。为提高选址的科学性与实用性，需要综合考虑地理位置、自然条件、交通、基础设施等多种因素。本文以嘉里大通物流有限公司广州分公司的仓库选址为例，从宏观和微观的不同尺度，以案例分析为主线，在梳理企业发展现状的基础上，通过宏观层面的仓库定位分析和微观层次的仓库选址分析，运用加权评分法，最终确定符合企业和市场需求的最佳仓库区位，旨在为相关仓储企业选址提供参考和借鉴。     

Combined estimate of a location parameter

In this paper, we revisit the problem of combining estimates of location considered by Cohen (1976). Our results unify and strengthen the results of Cohen (1976), Bhattacharya (1981) and Akai (1982).