基于Internet的协同CAD技术研究

协同CAD是将计算机网络、CSCW与CAD/CAM相结合的研究领域 ,协同CAD设计工具能够为分布式产品开发小组提供在线的、实时的协同讨论和问题求解的环境。通过对协同CAD的分析 ,提出协同CAD系统应划分为通用CSCW功能和专用CAD功能 ,并针对Internet低速网络环境下的实时性问题 ,详细地讨论了基于消息通信的显示同步和造型同步的实现技术。     

基于XML的协作虚拟样机通信技术

协作虚拟样机技术是在分布式环境下多领域专家协作建立和应用虚拟样机的方法和技术。如何实现系统中数字模型的同步以及相互操作是一个复杂的课题。目前协作虚拟样机通信的主流技术仍然使用传统的专有的通信协议和特定的数据格式通信，不能扩展，很难构建异构的、基于Intenct的协同设计环境。文中介绍了一种使用XMI，作为数据格式、HTTP作为传输协议的用于协作虚拟样机的通信模式,它可以很好地解决上述问题,进而构建一个面向对象的、可扩展的、基于Intemet的、跨平台的分布式协作虚拟样机系统。     

基于XML的协作虚拟样机通信技术

协作虚拟样机技术是在分布式环境下多领域专家协作建立和应用虚拟样机的方法和技术.如何实现系统中数字模型的同步以及相互操作是一个复杂的课题.目前协作虚拟样机通信的主流技术仍然使用传统的专有的通信协议和特定的数据格式通信,不能扩展,很难构建异构的、基于Intemet的协同设计环境.文中介绍了一种使用XML作为数据格式、HTTP作为传输协议的用于协作虚拟样机的通信模式,它可以很好地解决上述问题,进而构建一个面向对象的、可扩展的、基于Internet的、跨平台的分布式协作虚拟样机系统.     

基于MAS代理机制的协同设计系统研究

动态联盟的分布性、自治性、动态性等特征,给联盟的协调带来极大的复杂性。在讨论基于Web服务的多A-gent协同平台的基础上,提出如何解决异构CSCD系统之间的组织,同时对MAS的协作、协商、协调和通信机制进行了深入研究,建立了多Agent协作的网络协同设计多层体系结构和协作模型,为动态联盟环境下的协同技术提供支持。     

计算机支持的协同设计研究

文中讨论了建立计算机支持的协同设计支撑平台的关键技术。在体系结构上提出一个三层的结构，其中ＣＳＣＷ支持层设计为公共的协作代理。对基于共享对象协作的协同设计建立了超媒体结构的信息模型。按照这种思想建立的原型系统能够支持在地理上分布的多个用户，通过异步和同步的协作方式完成协同的设计工作，在异步协作方式下，可支持多用户通过对共享对象的操作完成协作；在同步协作方式下，可支持多用户通过对共享对象的操作完成协     

业务协同远程项目管理信息系统建模与实现

论文设计了一种计算机支持的业务协同远程项目管理信息系统。基于对现代项目管理业务协同信息模型的分析,阐述了群体协作系统模型、业务协同信息平台体系结构、同步机制与群组通信机制,使用统一建模方法设计了系统的静态模型和动态模型,给出了项目管理信息系统应用模型和用例模型。     

基于草图的面向概念设计的协同图表绘制工具

概念设计过程使用了多种图表来表示设计概念以及构建功能结构.将手绘草图作为设计者之间的一种通信语言引入到异地同步协同概念设计过程,提出了基于手绘草图的协同图表绘制多agent 系统,包含草图交互、草图识别、通信、协调等多个agent.讨论了各agent 之间的通信机制以及主要agent 的实现策略,包括草图识别以及语义一致性维护策略.将系统应用到协同流程图绘制领域,运行结果表明,该工具能够改善人机交互模式,促进多用户之间的交流和协作.     

CoGIS系统中通信子系统的设计与实现

协作GIS(CoGIS)系统的通信机制不同于WebGIS、网络GIS,其关键在于在所有的协作成员之间建立起通信链路,以保证成员之间的相互感知与协同。在此基础上,文章从CoGIS系统体系结构出发,采用直接通信和混合通信的通信方式来建立成员间的通信链路,设计并实现了连接层-数据层-控制层的通信模型,支持了成员的多媒体通信和消息通信需求,实现了一种实用、简单、可扩展的通信机制。     

图形协同标绘系统的研究与设计

讨论了一个远程同步的图形协同系统的设计与实现,重点研究了在协同工作中的交互技术,讨论了人－人界面的图形交互技术,并发控制策略以及协同感知的设计。     

基于Web的协作支持环境的研究与实现

提出的基于Web的协作支持环境（CSE），采用非透明事件广播类的同步协作模型，有效地解决了茯享屏幕类同步协作模型所存在的问题，可以很好地应用于Internet环境。对基于Web的协作支持环境的总体结构及各个模块的功能进行了详细讨论，并介绍了该系统的开发环境和实现方法。     

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.