基于RDF的XML文档安全发布

提出了新的基于RDF的无泄露XML文档安全发布方法．将XML节点封装为RDF对象，提高了刻画推理问题的能力；基于关键字的XML文档归并方法，在结合保存的历次发布记录基础上，有效拓展了推理控制的范围；最后通过对待发布文档的剪枝实现了文档的安全发布．     

基于结构与文本关键词相关度的XML网页分类研究

针对XML网页特点，提出了计算XML文档结构相似性、文档关键词出现的位置以及关键词频度的方法，根据计算的结果提取XML网页特征，同时设计了一种基于支持向量机的XML网页多类分类算法．算法通过XML文档的训练样本集为每一类文档建立基于相似公共特征的聚类核，计算测试样本中的文档与每个聚类核的相似度，判断该文档的所属类．实验证明该分类算法具有比较高的分类查全率和查准率，能够较好地解决XML文档同时属于多个类的问题．     

基于SWMVR的视频考勤系统应用研究*

随着语义Web技术的不断发展，基于XML的数据文档管理成为语义Web技术发展的难题，特别是RDF，DAML，OIL，OWL等本体语言的提出，基于XML的本体文档日趋复杂，传统的在关系数据库中依靠映射关系管理本体文档越来越困难。提出使用XML数据库Xindice来存储查询本体文档并设计了存储查询方法。     

一种基于模型映射的XML文档存储模型

本文提出了一种基于模型映射的XML文档存储模型Xpev，模型映射的主要特点是存储XML文档时不需要文档的模式信息。Xpev主要由三个表构成，通过Xpev可以将以数据为中心的XML文档存储到关系数据库中。Xpev模型优于已有的基于模型映射的存储模型。     

基于扩展编码的在线XML文档加载机制

Webservices应用中存在大量在线XML文档处理的需求，利用现行的XML数据处理方法来处理上述在线文档是一项可行方案，在线文档的加载问题应运而生；目前对XML数据的存储和查询都是基于对XML文档树的某种编码方法，使用扩展编码方法以提高文档更新性能；如何基于扩展编码方法完成对在线文档加载的研究目前还比较少．提出一种新的扩展编码方法，在此编码的基础上，提出一种适合在线XML文档的加载方法，通过统计同模式的XML文档特征和更新特征，一遍解析文档完成扩展编码和加载；实验结果表明，加载效率和更新性能较好．     

一种将XML文档转换为HTML格式文档的算法

文章研究了XML文档转换为富文本格式的方法,提出了一种基于XSL将XML文档转换HTML格式文档的算法.首先,新建一个与XML文档同名的HTML格式文档;其次定义转换算法,实现XML文档到HTML格式文档的转换;最后,调用系统默认浏览器以查看转换得到的HTML文档.该算法可以基于XSL将XML文档转换为HTML格式文档,以查看和验证XML文档的富文本显示格式是否符合阅读要求.     

一种基于XML的文档处理模型

在某军用软件开发过程中，由于系统文档格式不一致、结构性差，造成了系统文档管理、数据库存储及资源共享的不便。为解决这些问题，给出了一种基于XML的文档处理模型，应用XML和Oracle XML DB技术，对文档作结构化处理，并映射到关系数据库，映射过程中保持了文档模式语义约束和文档保真性；详细介绍了模型的结构和实现技术，并给出了应用实例。     

基于IDEFlx的面向对象XML建模

为了在IDEFlx数据库模型和面向对象模型的XML文档之间共享统一的模型，提出并实现了一种基于IDEFlx模型的面向对象XML建模方法。根据IDEFlx方法建立数据库模型，得到该模型的XML文档，然后对XML文档进行解析和重新组合，转换成为面向对象模型，并且生成该模型的XMLSchema文档。     

在J2EE体系结构上构建基于XML的数据交换系统

本文介绍了一种在J2EE体系结构上实现的基于XML的数据交换系统，系统实现了一个统一数据交换接口，各种类型的外部数据结构（包括HTML，WML）都可以通过格式转换而变为系统可以识别处理的XML文档，同时系统自定义了一套XML标签来标记各个XML文档，根据这些标签的内容来对XML文档进行处理，最后，本文还描述了系统中XML文档与传统关系型数据库的数据交换与格式转换，并指出了一些有待解决的问题。     

存在多值依赖的XML DTD规范化研究

XML DTD文档中可能包含由非函数依赖引起的数据冗余和操作异常，首先从消除DTD文档内数据冗余的角度出发研究了文档的规范化的问题，讨论了在DTD文档中存在多值依赖的情况下，如何规范XML文档，提出了以DTD为模式的XML文档的多值依赖的概念。然后基于多值依赖的概念，提出了XML文档的一种多值依赖范式MXNF。最后在此基础上提出了把一个XML文档的DTD无损联接地分解成为符合MXNF的规范化算法，来规范存在多值依赖的XML DTD文档，并给出了该算法的分析说明。     

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.     

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.     

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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