产业集聚与黑龙江省城市化发展研究

产业集聚与城市化是相辅相成、互进互动的关系。文章通过分析黑龙江省城市化和产业集聚过程中取得的成绩和存在的问题,提出政府应该通过加快产业集聚推进城市化进程,并在推进城市化过程中搞好城市规划,考虑产业集聚的需要,为产业集聚创造条件,以实现产业集聚与城市化的良性互动。     

中小企业集群化发展探析

随着世界经济的不断发展,中小企业集群成为经济较发达地区产业组织结构中一个很重要的现象,集群化发展可以解决中小企业自身存在的弱点并提高竞争优势。对中小企业集群理论进行简单的回顾,分析中小企业集群化发展的优势,以河北中小企业集群化发展的现状为例,分析河北中小企业集群中存在的问题,以期推进中小企业集群的良性发展。     

我国证券市场的板块联动效应及模糊聚类分析

以上海证券市场的各分类样本指数为研究对象,首先分析了传统的五大类指数、A股、B股之间的相互及其与大盘的关联性,验证了B股市场运行的独立性。然后随机抽样了24个分类板块指数,研究了它们之间的相关性,并运用模糊聚类分析法对其进行了聚类分析。最后根据实证研究结果,对投资者提出有一定参考意义的投资操作建议。     

数学在建筑监察领域的运用

对于在建建筑的规划管控,是一个城市规划管理局的重要职能,由于在建建筑众多,尤其对于一些大型城市,对于在建建筑的规划管控主要是从建筑物的尺寸角度来进行的,包括是否超宽、超高等。如何引入计算机数学思想,构建一个在建建筑的智能化规划监察管控系统,并杜绝人情因素,成为提升规划监察工作效率和质量,体现科学发展观的重要技术手段。     

基于分形理论对武汉城市圈城市体系的研究

运用分形理论对武汉城市圈城市体系等级规模结构和空间结构做了定量分析。研究结果表明,武汉城市圈城镇等级规模分形维数D为0.7233,小于1,这说明武汉城市圈城镇规模等级结构较为分散,属于典型的首位分布类型,城镇体系发育不成熟。而城镇空间关联维数D=0.8499,小于1,这表明武汉城市圈城镇体系内各城市间联系紧密,分布高度集中于一地。本文在分析武汉城市圈城市体系的等级结构和空间结构的基础上,提出了可行性建议。     

京津冀地区城市层级结构及协同发展战略

首先介绍了钱纳里的区域经济发展阶段标准和弗里德曼的核心—外围区理论,继而运用以上理论对京津冀地区各城市的发展阶段和层级结构进行了分析,在此基础上得出京津冀地区城市协同发展战略:构筑环首都经济圈、打造沿渤海经济带、加速冀中南地区崛起、对接融合中原经济区。     

生态脆弱区经济再发展问题探讨--以西北地区为例

生态脆弱区的经济再发展问题是我国可持续发展战略所研究的重大问题,是发展市场经济、推动现代化建设的重要领域。本文利用国家统计局及人力资源和社会保障部编制的年鉴资料,从中选取了10个与生态脆弱有关的统计指标,采用因子分析和聚类分析的统计方法,将我国各省、自治区、直辖市的生态环境划分为7类,并着重研究西北生态环境脆弱区,分析其生态脆弱区的特点,研究解决办法,为西北生态脆弱区的经济再发展提供可行性建议。     

Spatial Dispersion of Interconnection Clusters in the European Internet

Abstract

This paper studies the effects of geographical distance on the interconnection agreements between providers participating at Internet Exchange Points (IXPs) in Europe. We assess separately two main issues: the extent of existing clustering, as well as the role of proximity in bilateral interconnection decisions. Our results show the dominance of spatial random patterns in the interconnection agreement distributions. On the other hand, we find that proximity positively affects the probability of establishing interconnection for all the IXPs studied but one. Interesting, the latter is the only one showing an initially clustered morphology. This indicates a prevalence of centripetal forces—local spillovers and mutual knowledge—over geographical differentiation for any pre-existing interconnection pattern morphology except the clustered ones.     

Designing communication architectures for interorganizational multimedia collaboration

Advances in computer and communication technologies have stimulated the integration of digital video and audio with computing, leading to the development of various computer‐assisted collaborations. In this article, we propose a multilevel conferencing paradigm called super conference for supporting collaborative interactions between geographically separated groups of users, with each group belonging to possibly a different organization. In a super conference, each participant must receive and display the composite media stream obtained by mixing media streams transmitted by all the other participants. Hierarchical communication architectures are naturally suited for media mixing in super conferences. We present algorithms for designing hierarchical mixing architectures that optimize real‐time end‐to‐end delays of media. In order to improve their real‐time performance further, we propose multistage mixing techniques by which mixers can carry out mixing concurrently with communication. Surprisingly, the optimal architectures for multistage mixing are widely different from those of monostage mixing (in which, mixing and media communication sequential as opposed to concurrent). Based on real‐time delay constraints of multimedia, we obtain interesting limits on the sizes of both super conferences and groups within super conferences in optimal hierarchical architectures, which go to show their high scalability in terms of both the maximum number of participants and the geographical separation between them.

At the Multimedia Laboratory at the University of California, San Diego, we have implemented a conferencing system on an environment of Sun SPARCstations equipped with digital multimedia hardware. As an interesting application of the conferencing system, we have developed a telepresenter by which users can remotely attend lectures in progress. We present initial experiences with the system.     

环境保护水平的地区差异及对策研究——基于山东省17地市的实证分析

环境既在一定意义上构成经济增长的前提和基础,又是经济增长的主要目的,甚至环境本身就被当作资源禀赋和财富。近年来,山东省环境保护水平有了明显提高,但地区差异较大。本文采用因子分析和聚类分析法,对山东省17地市的环境保护水平进行了综合性评价,以期为环境保护水平的提高提供理论依据和对策建议。