基于本体的论文管理系统

由于用户知识领域的局限性，传统的论文管理系统无法为用户提供全面而高效的关键字查询。该文设计了QOFLoDL本体描述语言，在论文管理系统中引入中用它所描述的本体库，对传统的论文管理系统进行了重新构建，提出一种新的论文管理系统——基于本体的论文管理系统(PMSBOO），为用户提供了全面而高效的关键字查询服务，PMSBOO实现了基于知识点的协同学习，通过这种学习方式各个知识领域的用户可以进行知识共享和知识交流从而达到协同学习的目的，很大程度上提高了用户的学习效率。还在PMSBOO中提供论文大纲提取功能，使用户通过先阅读论文大纲来对论文进行有选择的重点阅读，从而提高了用户的学习效率。     

基于证书的信息门户单一登录

本文在公钥算法的基础上提出了一种基于数字证书的信息门户用户单一登录的实现方法。用户只需要在登录门户时提供一次用户信息(如用户名和密码)，通过服务器验证后，在该次会话中，访问门户中的网络资源时无需再提供用户信息，而是由单一登录系统完成资源对用户的认证。     

支持隐私信息量化与保护的访问控制系统

现有的访问控制系统大多只考虑访问者是否合法，而不考虑访问过程中被访问者的隐私信息是否泄漏过多，这将造成一些隐患。为了解决这个问题，提出了一个基于本体的、可以保护用户隐私信息的访问控制系统。该系统拥有一个隐私本体，不仅可以对隐私泄露程度进行量化，进而从保护隐私的角度给出决策，还为访问控制规则的推理、去冗余提供了可能。该系统允许用户从定义阈值和定义规则两方面来保护自己的隐私信息，且定义方式较为友好。实验结果显示，提出的访问控制系统能达到灵活保护用户隐私的目的。     

基于证书的信息门户单一登录

在公钥算法的基础上提出了一种基于数字证书的信息门户用户单一登录的实现方法.用户只需要在登录门户时提供一次用户信息(如用户名和密码),通过服务器验证后,在该次会话中访问门户中的网络资源时无须再提供用户信息,而是由单一登录系统完成资源对用户的认证.     

基于Web信息搜索的空间信息门户

空间信息门户为用户提供一个统一的入口访问分散异构的空间信息资源，是国家空间信息基础设施的重要组成部分。传统的空间信息门户大多采用OGC在空间信息门户参考体系架构中推荐的“发布-检索-绑定”模式，本文提出一个新的基于Web信息搜索的体系架构，并对其中空间元数据自动提取等关键技术进行了研究，最后通过原型系统进行验证。     

基于语义技术的软件用户访问控制方法

在应用软件中广泛使用的访问控制模型不能根据用户上下文来动态改变资源的访问权限。针对上述问题提出一种基于语义技术的访问控制方法,实现了对用户的动态授权。提出基于语义信息的用户模型和资源模型并构建面向用户模型和资源模型的基础本体,定义一组与访问控制相关的语义规则及推理规则,并设计基于语义推理过程的判定算法。访问控制过程是接收并分析访问请求,根据语义规则从显示的本体知识中获取相关联的用户信息,调用判定算法得出用户与资源间的访问权限关系。最后通过某综合减灾应用系统案例来验证该方法的有效性。     

基于本体的非结构化知识库系统研究

本文提出一种基于本体的非结构化知识管理系统框架.在该框架中,知识库由知识体和应用本体两部分组成,可解决知识的重用和共享问题.知识检索可以通过知识地图导航和自动检索两种方式完成,有一定的智能性.知识管理门户采用XML和XSL相结合的开发方法,具有动态特点.本文还对知识库的安全管理方法进行了初步研究,提出了一个可用的知识库安全管理解决方案.     

基于Jetspeed2.0的Portlet二次开发

门户为内部和外部用户访问Web站点的信息和应用提供了一个单一的访问入口,一个Portlet是门户中提供特殊服务或信息的窗口.介绍了基于公开源代码的企业信息门户软件Jetspeed,分析了最新版的Jetspeed 2.0的各个组成部分,并通过一个例子详细介绍了在Jetspeed2.0的基础上进行Porrlet二次开发的过程.基于Jetspeed2.0很容易对Porrlet进行二次开发,编写一些自己的Portlet,通过对这些Portlet的个性化设置,实现整个门户网站的个性化.     

知识管理在信息门户中的应用

信息门户在企业知识管理中的直接作用是知识获取和知识传递的入口和通道。一方面,通过信息门户将知识信息进行收集和汇总,另一方面,通过信息门户将知识、信息进行分发和传递。应用知识管理的门户解决方案根据系统实现方式的不同分为两种．第一种实现方式是通过Portal产品与成熟知识管理产品集成的解决方案,第二种实现方式是基于门户产品内置的知识管理组件结合用户的实际业务情况组装成完善的解决方案。     

基于Web Services单点登录系统的设计与实现

信息化的进一步发展，使企业内部应用系统增多，用户访问这些系统时，需记住多个口令，多次登录，降低了工作效率。针对这个问题，提出了一种基于Web Services的单点登录系统。文中介绍了当前几种单点登录技术，利用Web Services技术实现了跨企业内部应用系统边界的单点登录。详细分析了内嵌于门户系统的单点登录机制．提供了安全的第三方接口，用户只需登录门户系统即可访问任何一个授权应用系统的实现原理与方法。     

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.     

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.     

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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