Clustering with Weighted Hyperlink and Sub Similarity Matrix

Now, effectively searching web page becomesmore and more critical as the online information con-tinues to overload the web. Asolution is to make areasonable web page clustering analysis . But there isanother problem,because we must find out the webstructure and page hyperlinks , especially si milarityamongthe pages . At the same ti me ,there are someother very i mportant information such as the i mpor-tance of each page ,page content and so on[1 -3].Hyperlink analysis has already been applied …     

New Clustering Method in High-Di mensional Space Based on Hypergraph-Models

Clustering of datain alarge di mensionspaceis ofa great interest in many data mining applications .Clustering methods have been studiedin several areasincluding statistics , machine learning and data min-ing. Most of the algorithms are effective whenthe di-mensionality of the datais relativelysmall .But ,theseschemes tend to break down when the di mensionalityof the datais very high.There are several reasons[1].First ,it is not trivial to define distance measure in alarge di mensional space .…     

基于I-RBAC的CIMS集成访问控制

CIMS面临复杂的数据资源的安全管理难题，传统的访问控制一般分散在网络操作系统、数据库管理系统、应用系统中，没有一个统一的安全控制策略。为此，在目前RBAC模型的基础上，提出了集成角色访问控制模型，并从静态和动态两方面研究了模型的内容和规则，给出了模型实现的体系结构，分析了角色的安全性。该模型已应用于某烟草集团CIMS建设中，使访问控制更好地适应了企业特定的安全策略。     

网格环境下基于OAI的数字图书馆互操作机制

现有数字图书馆（DLs）互操作方案，在实现大规模数字图书馆集成方面都存在一定的局限性。该文将网格技术与OAI-PMH框架相结合，提出了一个数字图书馆网格（DL Grid）互操作框架，并对网格环境下元数据资源的发现、采集、重组等关键问题进行了分析和设计，初步实现了在集成的元数据基础上数字图书馆信息的共享。     

基于Agent技术的智能体网格的研究

Agent能够感知外界环境的动态变化，而支持动态环境变化是网格的基本要求之一。把Agent技术引入到网格计算中，通过对Agent技术的特点和优点的分析，给出智能体网格的概念和体系结构，阐明Agent在智能体网格中，既充当Grid的使能器，又作为其功能享受者的特殊作用，最后，提出Agent技术在基于开放网格服务体系结构（OGSA）的网格计算中的应用模型。     

传感器网络中一种基于质心的分布式成簇算法

在LEACH的基础上，提出了一种适合无线传感器网络的基于质心的分布式成簇算法——CDCS。在CDCS中，每一个节点首先基于最优簇首概率popt自主确定自己是否为临时簇首。然后临时簇首根据收集到的簇内节点信息，确定簇内近似质心，并由此动态调整簇内结构，使得调整后的簇内通信总能耗尽可能小。理论分析和模拟实验表明，CDCS在保持LEACH算法简单性的同时，可以获得比LEACH更好的性能，优化后的簇首选择策略可以在不同场景下有效延长网络生存时间达32%~38%。     

Architecture of Multimedia Proxy Caching over the Internet

Streaming media data have strict delay and loss requirements, which cannot be adequately supported by the current Internet. Proxy caching technology is introduced to alleviate the effect of the bottleneck bandwidth on the transporting quality. A new architecture of multimedia proxy caching is given to solve the problem of the traditional Web caching technology for the multimedia streaming. The mixed media management module and the resource management module are added to this architecture, the prefetching and replacement method is studied considering the characteristics of streaming media data, the concept of weighed popularity is given to enhance the exactness of the replacement algorithm.     

数据挖掘语言研究现状及发展

论文介绍了目前比较流行的几种数据挖掘语言及其标准化方面的研究进展,比较分析了几种数据挖掘语言的优缺点,并对这几种数据挖掘语言的结构和组成进行了探讨和研究,最后探讨了数据挖掘语言的发展趋势,以及需要解决的问题。     

移动分组无线网多播协议的设计与实现

提出了用于移动分组无线网的多播路由协议。在移动分组无线网环境中，多播路由协议起着非常重要的作用。传统的应用于有线网络的多播方法无法适应移动分组无线网具有的拓扑结构变化和带宽有限等特点。在协议中不需要维护全局的路由信息，而采用按需路由发现策略，动态建立路由信息及维持多播组成员关系。仿真实验显示协议在带宽较低、多播组成员数量变化较大的移动分组无线网环境中，具有较好的可靠性和工作效率。     

Construction of Mediators for Heterogeneous Data Source Integration Systems

To construct mediators for data integration systems that integrate structured and semi-structured data,and to facilitate the reformulation and decomposition of the query,the presented system uses the XML processing language(XPL)for the mediator.With XPL,it is easy to construct mediators for data integration based on XML,and it can accelerate the work in the mediator.