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     

基于Web日志文件的关联规则挖掘模块的实现

在对Web应用挖掘的基本步骤作系统性研究的基础上,设计了一个基于Web日志文件的关联规则挖掘模块。该系统应能够对用户访问Web时服务器方留下的访问记录进行挖掘,从中得出用户的访问模式和访问兴趣。为了识别用户浏览模式,实现了利用关联规则挖掘算法Apriori对Web应用挖掘过程中预处理阶段所产生的用户会话文件进行挖掘的模块,该模块针对用户选定的若干页面产生满足最小支持度和最小置信度的页面之间的强关联规则,并以文本的形式显示挖掘的结果。     

基于Apriori算法的Web日志挖掘研究

本文在对Web日志挖掘理论和Apriori算法研究的基础上,设计和实现了Web访问日志挖掘系统,并将该挖掘系统应用于学院网络中心的"招生信息网"上,对Web服务器的日志记录进行了挖掘实验,找出用户的频繁访问路径,得到较为理想的结果。     

面向Web关联规则挖掘的快速Apriori算法

本文通过对Web日志的处理,应用关联规则方法对用户访问行为进行挖掘,来发现资源间的关联性.通过对Apriori方法的分析,运用对事务集和候选项目集有效约减的方法,提出了基于Apriori算法的改进的快速Web资源关联规则挖掘算法FApriori方法.通过对KDDcup2000数据的验证,证明算法的有效性和正确性.     

基于筛选压缩的类Apriori算法的研究

该文根据用户的Web访问路径应用关联规则和类Apriori算法挖掘出该用户的频繁访问路径,通过对Apriori算法和目前针对提高该算法效率的各种优化技术的详细分析和研究,对类Apriori算法进行了改进,提出了基于筛选压缩的类Apriori挖掘算法,并进行了模拟实验,比较结果显示基于筛选压缩的类Apriori挖掘算法挖掘用户频繁遍历路径的效率高于类Apriori算法,最终可获取用户的频繁遍历路径。     

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日志挖掘的个性化服务站点

介绍个性化站点的概念，并对Web日志挖掘系统体系结构进行分析。其后将关联规则挖掘技术应用到日志事务会话中，在对日志数据的特性分析的基础上提出类Apriori挖掘算法。对类Apriori挖掘算法得到的频繁项集如何有效提取关联规则提出了最有效的方法。在实际应用中探讨了如何从多个匹配的关联规则中选择合适的匹配规则。     

一种无冗余的Web日志挖掘算法

Web日志挖掘是Web数据挖掘的一个重要研究领域。Web日志挖掘通过发现Web日志中用户的访问规律和模式,可以提取出其中潜在的规律和信息,人们对这个领域的研究也日益重视。然而,传统的基于关联规则的Web日志挖掘算法都是基于所有关联规则的。这种方式往往挖掘产生大量的候选规则,而且存在大量冗余的规则。提出了一种新的无冗余的Web日志挖掘算法,该算法通过引入频繁闭项集合最小关联规则的概念,从而解决了以往基于所有关联规则挖掘算法中出现的上述问题。     

Apriori算法在DNS记录挖掘中的应用与研究

DNS访问记录体现了网络用户的访问意图,通过Apriori关联规则挖掘算法处理这些记录,生成关联规则用以发现网络用户的访问行为模式,从而满足用户识别、用户分析等应用需求。该文详细分析了Apriori关联规则挖掘算法,针对其不足进行改进,应用于DNS访问记录挖掘中,对产生的关联规则进行了分析,得到相关用户的一些访问行为模式。     

一种基于关联规则的Web日志数据挖掘的实现方法

介绍一个基于关联规则数据挖掘Web日志分析的实现方法,提出通过对Apriori算法的改进,提高其挖掘效率,根据其结果,达到理解用户行为和改善Web结构的目的.     

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.     

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.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate