基于情景感知的相关推荐信息挖掘研究

通过对移动用户在位置、时间、业务需求即用户所处情景的综合挖掘分析,本文分三个步骤为移动用户提供当前情景下与用户当前业务需求相关性最强的业务信息以及下一情景下与当前情景下业务需求相关性最强的业务信息的主动推荐.     

一种个性化移动搜索技术的研究*

在Ｗeb上进行搜索时,每个人都有各自的背景和目标,针对移动搜索的个性化需求,提出了一种基于本体的个性化搜索模型。该模型通过隐式地捕捉移动用户的浏览历史,为本体概念赋予相应的权值从而得到用户的兴趣模板。根据用户不断更新的访问行为,采用扩散激活算法来维护调整相应概念权值,最终将经过重排名的结果转换为WAP协议标记语言格式输出给用户。实验结果表明,根据概念权值进行网页重排名的方法对于改进移动用户体验来说是非常有效的。     

移动端个性化旅游推荐系统模型设计

本文在基于现有的个性化推荐研究基础,提出了用户情境和文本内容组合推荐的方法,并构建了用户兴趣矩阵模型,设计了一套个性化推荐系统。本系统可以依据移动用户的偏好为用户提供推送服务。该系统由移动端及云平台服务器构成,移动端对用户信息进行采集,并展示推荐数据;服务器端收集来自移动端的数据,展开数据分析,构建用户兴趣模型,结合文本处理技术获取推荐内容,推送给移动用户。     

基于情景感知的N-gram改进预测模型研究

情景感知服务(Context-Awareness Services)借助信息技术为用户提供自适应服务,卓著的个性化特性使其将成为下一代杀手级应用.本文综合分析移动用户的位置、时间和业务信息,通过改进N-gram模型有效地预测用户行为趋势,以期通过最优化的方式使用户需求与其所处的环境资源相匹配,既期望能从用户视角获得更加丰富的信息体验,又期望能对运营商有所帮助,对理论研究及商业实践均具有积极意义.     

基于本体的知识库个性化检索方法研究

在使用本体技术构建知识资源检索系统的研发过程中,常会遇到检索结果同检索者本身实际情况不符,以及计算机难以理解用户实际需求的问题。为此,我们提出了一种基于本体的知识库个性化检索方法,将知识服务的本体构建、服务定义的过程同用户的个性化信息有机结合起来,并在服务执行的使用用户个性化信息来优化执行结果。实践表明,该方法可以比较精确的识别用户个性化需求,简化用户输入,提升查询结果质量。     

基于本体的知识库个性化检索方法研究

在使用本体技术构建知识资源检索系统的研发过程中,常会遇到检索结果同检索者本身实际情况不符,以及计算机难以理解用户实际需求的问题。为此,我们提出了一种基于本体的知识库个性化检索方法,将知识服务的本体构建、服务定义的过程同用户的个性化信息有机结合起来,并在服务执行的使用用户个性化信息来优化执行结果。实践表明,该方法可以比较精确的识别用户个性化需求,简化用户输入,提升查询结果质量。     

移动用户兴趣点标记语义映射方法

针对当前移动用户兴趣点标注没有统一的语义本体这一问题,通过对移动用户兴趣点分类,建立了 POI概念本体层次树,将用户标注的POI信息与本体树节点通过一种改进的映射方法建立映射关系,为移动用户标注信息提供统一的规范化语义。实验收集多名志愿者5周的真实标注信息来评价该方法,实验结果表明该方法具有较高的准确率。     

一种自适应语义Web检索方法

基于内容的语义Web检索只考虑内容本身,没有考虑用户的不同,不能准确反映用户需求。为此,提出一个自适应语义Web检索框架,对于Web中文文档,借助HowNet知识库给出一种本体学习方法,通过提取用户客观、显式和隐式信息建立用户信息库,并设计用户初始查询本体和个性化查询本体构建算法,从而实现用户的自适应检索。实验结果表明,该方法具有较高的检索效率。     

一种基于情境推理的语义Web服务发现方法

传统的语义Web服务发现方法,由于受到用户所处的情境因素的约束,所发现的服务很多不能满足用户的情境期望.文中提出了一种基于情境和推理规则的Web服务发现方法,使用该方法可以得到适宜用户情境的Web服务.分别建立了用户情境本体和Web服务情境本体来描述情境信息,建立了用户情境和Web服务情境之间的推理元规则,提出了相应的推理算法,并基于该算法实现了情境推理模块.实验结果表明,与现有语义Web服务发现的方法相比,文中方法能够在增加合理的时间开销的前提下为用户提供更加准确的服务查询结果.     

基于本体的数字图书馆个性化用户模型表示

本文针对当前个性化服务中基于关键词的用户兴趣表示方法在语义上的不足,结合本体语义信息丰富的特点,提出了一种基于本体的用户模型表示方法。在数字图书馆领域内,介绍了本体形式化描述并构建了数字图书馆领域本体,给出了用户模型的表示方法。并以个性化信息检索为例,说明了利用用户兴趣本体表示中的同义,上下位等关系给用户提供服务的方法。实验表明基于本体的表示方法能够给用户提供更加个性化的信息。     

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

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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

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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.