基于SVG的管道系统技术研究

针对B/S应用中的Web服务器与浏览器间频繁操作导致Web应用执行速度慢的问题,在SVG的基础上利用Ajax和Web服务等技术,实现基于SVG的管道系统.运用Ajax实现Web无刷新页面更新数据,在客户端利用SVG提供的DOM编程接口和JavaScript脚本语言对SVO进行开发,实现其交互功能.通过该系统可以查看管道的布局,管道实时信息,监测管道实时流量变化.     

利用Ajax Web实现实时监控系统软件设计的改进

首先介绍传统Web的局限和Ajax的技术优势,然后介绍传统实时监控系统软件架构的不足,并因此引入了用Ajax Web技术改进的实时监控系统的软件架构.采用Ajax Web技术后的软件架构部署方便,软件使用灵活性大,支持跨平台并且软件开发能快速适应需求变化.最后用一个实时温湿度监控系统讲述了用Ajax Web技术改进的实时监控系统的实现过程.     

基于SVG的Web远程实时监测客户端研究*

针对现有基于Web的监测系统客户端技术在实时性方面的不足,利用可缩放矢量图形(SVG)和Ajax技术设计了一种新的基于Web的远程实时监测客户端系统。该系统利用SVG技术实现图表绘制,利用Ajax进行数据通信和传输,完成了一套完整的基于Web的图表组件,并在振动监测系统中得到了实现,具有良好的实时性。     

SVG技术在煤矿监控系统中的应用研究

为了以图形图像形式高效发布煤矿实时数据,提出将SVG技术应用到煤矿监控系统中,介绍了基于SVG技术的实时数据发布方案。该方案采用Ajax技术获取数据库服务器中的实时数据,并利用SVG技术构建直观、实时的远程监控矢量图形页面,实现了实时数据的加载及显示。     

基于Ajax和SVG的Web远程实时监控系统

以ASP.NET为平台,使用Ajax和SVG实时显示技术完成了基于Web的B/S模式远程监控,实现了跨操作平台的网站式远程实时监控系统,将实时监测与控制系统构筑于Internet之上,通过Internet实现对现场设备的实时远程监控、设备故障诊断与调试。设计的前端设备远程监控器可实时监控现场设备的工况,方便组网实现多监控点的实时监控,易于扩展。应用结果表明,该系统有良好的实时性、可靠性、交互性和扩展性。     

Ajax技术在图形信息实时发布中的应用

介绍了Ajax技术及其相对于传统Web技术的优点,提出一种利用Ajax技术实时发布SVG图形信息的方法,并通过实践证明了该方法的良好表现.     

利用Ajax结合VML实现Web图形化监控

基于Web的可视化应用监控是Web应用的一个新需求。介绍了Ajax结合VML实现图形动态显示处理的实现方法,给出了变化温度和实时变化的数据曲线的图形绘制,其中描述数据由随机函数模拟产生。通过Ajax技术动态获取服务器的动态数据,利用DHTML结合VML技术在Web页面中实现矢量图形绘制,从而为基于Web的实时监控应用设计提供了基础。     

基于Web的实时数据监测系统的研究与实践

针对目前各类工业生产监测系统要求实时性强、不受区域范围限制、维护方便等的需要,提出一种基于Web的,以Ajax、SVG为核心技术的实时数据监测系统设计方案.该方案应用Ajax开源框架DWR提高了实时监测数据获取的速度,并利用SVG可动态显示图形以及支持用户交互的特点解决了在web上实时显示监测数据变化趋势曲线、单击数据点获取数据值以及数据变化趋势曲线历史回放等关键问题.基于该方案设计开发的金属腐蚀监测系统的应用结果表明该方案可提高基于Web的实时数据监测系统的实时性与灵活性.     

基于SVG的实时交通信号Web监控设计与实现

多层组件技术和SVG技术的出现为Web应用开辟了新的领域.本文基于ActiveX组件技术实现交通信号控制系统的实时连接,以SVG矢量图形作为路网和路口图形显示界面,通过XMLHTTP协议在服务器和客户端页面之间传输数据,应用XMLDOM对象对XML数据进行解析,实现了基于Web多层计算结构的交通信号实时监控界面,取得了较好的应用效果.     

基于SVG的栅状图绘制系统设计和实现

栅状图在进行地层对比和综合解释方面有其独特的作用.为在Web网页上动态地绘制栅状图,根据栅状图绘制系统的需求,研究了栅状图生成算法,并设计了栅状图绘制系统模型.利用Ajax异步获取数据时无需刷新页面的特点以及SVG对脚本语言的支持,增强了栅状图的动态性和交互性.采用B/S模式,服务器响应客户端的实时请求动态绘制SVG格式的栅状图.与传统图片在网页上加载缓慢的情况相比,该系统能够同时降低网络数据传输量、减轻服务器的负担,有效地提高栅状图绘制系统的响应速度.     

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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