因子分析在基于用户兴趣的Web文档聚类中的应用

通过对实际Web访问日志的统计分析认为,在日志中用户的兴趣具有集中性,这说明用户由稳定兴趣驱动访问Web的频率远远高于偶然兴趣的驱动,因此一定时间段的Web访问日志中一定蕴含了用户的稳定兴趣.本文试图利用因子分析理论从用户访问频率矩阵中挖掘出用户的稳定兴趣因子,以此构造用户兴趣空间,并在用户兴趣空间中进行Web文档聚类.该用户兴趣空间突出了用户的共同兴趣,是一个正交空间.实验结果表明,用户兴趣空间中的Web文档聚类优于直接在用户访问频率矩阵(即用户空间)中的聚类.同时,空间的转换达到了数据压缩的效果.     

改进的关联规则算法在电子商务中的应用

Web日志数据中保存有大量用户访问信息,而Web日志挖掘就是对系统日志信息以及用户的注册数据等进行挖掘,以发现有用的模式和知识。首先介绍了Web日志挖掘的基本流程,然后介绍了电子商务中的日志挖掘,并着重分析了在模式识别中如何利用改进的关联规则算法来挖掘出用户频繁访问的路径和页面兴趣度,为个性化推荐系统模型提供了依据,从而证实了对Web日志数据进行挖掘具有很重要的现实意义。     

基于Web日志挖掘的用户兴趣度分析

用户访问兴趣度的分析是Web日志挖掘中一个重要的研究课题.在概述Web日志挖掘过程的基础上,对日志挖掘各个阶段进行了分析,研究得出了用户对访问页面的兴趣度.     

基于Web日志挖掘的用户兴趣度分析

用户访问兴趣度的分析是Web日志挖掘中一个重要的研究课题。在概述Web日志挖掘过程的基础上,对日志挖掘各个阶段进行了分析,研究得出了用户对访问页面的兴趣度。     

基于用户兴趣迁移的Web日志仿真生成算法

针对仿真生成算法采用静态分布模型生成Web日志,会造成与真实数据之间存在较大差异的问题,提出一种基于用户兴趣迁移的Web日志仿真生成（WLSG）算法。该算法首先对Web日志与时间的关系进行了建模;其次,模拟了用户在不同时间访问文件时用户的兴趣迁移;最后,也模拟了用户自适应访问当前时刻最感兴趣的文件。相对于现有的采用静态分布模型的仿真算法,所提算法能够提高自相似性指标约2.86%。实验结果表明,该算法通过用户的兴趣迁移来改变用户的访问序列,能够较好地模拟真实Web日志,有效地应用于Web日志的仿真生成。     

基于关联规则的Web日志数据分析系统

本文旨在研究基于Web环境下利用关联规则对Web日志挖掘的数据分析系统。把关联规则的概念引入到web日志挖掘中,将用户的访问路径以关联规则的形式表现出来,其目的在于从用户访问超文本系统的行为中发现用户的访问模式。然后在砷riori挖掘算法思想的基础上,对其改造,给出了适合挖掘用户访问频繁路径的类Apriori算法。最后设计开发了一个Web日志数据分析系统。此系统主要包含三个功能模块：数据预处理模块、智能分析模块和基本分析模块     

Web日志挖掘技术的应用研究

Web日志中保存着用户访问网站的大量信息,通过挖掘预处理后的日志数据,可以得到用户聚类,URL聚类以及用户频繁访问路径等诸多有用信息。本文先分析处理网站的日志数据,再阐述了Web日志挖掘的算法,最后讨论了Web日志挖掘的应用。     

基于关联规则的Web日志数据分析系统

本文旨在研究基于Web环境下利用关联规则对Web日志挖掘的数据分析系统。把关联规则的概念引入到Web日志挖掘中,将用户的访问路径以关联规则的形式表现出来,其目的在于从用户访问超文本系统的行为中发现用户的访问模式。然后在Apriori挖掘算法思想的基础上,对其改造,给出了适合挖掘用户访问频繁路径的类Apriori算法。最后设计开发了一个Web日志数据分析系统。此系统主要包含三个功能模块:数据预处理模块、智能分析模块和基本分析模块     

基于用户访问树的Web日志挖掘数据预处理

在Web日志挖掘中数据预处理是整个挖掘过程的基础,直接影响日志挖掘的质量和结果.提出了一种基于用户访问树的Web日志挖掘数据预处理方法,该方法在处理过程中根据Web日志建立用户访问树,并利用用户访问树进行用户和事务识别,从而可以在缺乏网站拓扑结构的情况下准确地对Web日志进行预处理.     

基于模糊聚类的Web日志挖掘的应用研究

在Web数据挖掘研究领域中,Web日志挖掘是Web数据研究领域中一个最重要的应用方面。本文对Web日志挖掘作了系统的研究,包括对服务器上日志结构的分析和对数据预处理过程的描述。文中着重讨论了用户模糊聚类的算法,并用实例证明了模糊聚类在Web用户聚类应用中的可行性。在此基础上还提出了一个Web站点的个性化服务模型,通过对Web服务器中日志的挖掘,发现具有相似访问兴趣的用户群,进而为用户作个性化的推荐。     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

International Journal of Automation and Computing Table of Contents

正~~     

Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

正~~     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.