现场总线过程控制与远程监视实验系统

基于LonWorks现场总线技术和Internet技术，介绍一个具有远程监视功能的LonWorks现场总线过程控制实验系统CS2003的设计与实现。它集下位智能节点控制、上位可视化图形组态监控及远程监视为一体，具有组态界面友好、运行实时可靠、操作简单方便等优点。通过实验和应用表明了系统运行状况良好，达到预期要求。     

基于LonWorks总线式煤气管道监控系统的研究

随着计算机技术、通信技术和控制技术的不断发展,在自动控制领域内LonWorks现场总线控制系统将逐步取代传统的集散控制系统.通过一种基于LonWorks现场总线的煤气管道监控系统的研究,以CO有毒气体浓度监测为例,给出了模拟量智能节点的软件、硬件的设计.最后,提出了总线远距离数据传输及监控系统的解决方案,说明了LonWorks技术在工业自动化领域的应用前景美好.     

基于LNS的OPC服务器的开发

针对不同组态软件应用LonWorks总线需要开发不同驱动的问题,分析了基于LNS的LonWorks监控方法以及OPC技术的基本特点,提出了基于LNS的OPC服务器方案和实现方法.     

VC实现OPC技术在DeviceNet总线中的应用

目前的组态软件受制于硬件驱动,OPC技术的提出可以解决这一问题.本文介绍了OPC技术的产生背景和规范,以及OPC技术在DeviceNet现场总线系统中的实现.设计出基于OPC技术在DeviceNet现场总线控制系统图.详细论述了OPC客户端的开发思想.使用Visual C++编程语言设计了基于Woodhead的OPC数据服务器的客户端上位机软件.经过工业现场的使用证明,开发的客户端软件界面丰富,监控软件不会更改硬件通讯协议.     

人防工程的内部设备自动化监控系统研究

本文简单描述了人防工程内部设备监控系统现状．介绍了现场总线技术和基于LonWorks现场总线的893LM自动化监控系统。详细描述了893LM自动化系统的各种方案配置，最后举例说明893LM自动化系统的构建。     

基于CAN总线的变电站综合自动化系统的设计

以CAN总线为通信手段,构成基于现场总线的变电站综合自动化系统;通过对变电站自动化现状的分析,介绍了基于CAN总线的变电站综合自动化系统的底层硬件设计,包括模拟量输入输出智能节点的设计、离散量输入输出智能节点的设计、通信协议转换单元的设计等;并采用组态软件--组态王6.01进行监控界面的设计,实现了与下位机的数据通信及与上位机之间的通信;采用先进的CAN总线技术,降低了成本,实现变电站的无人值班,远方调度通过网管软件能够及时地监控各变电站的电压、电流、功率的变化,断路器、隔离开关的状态,及时地发现和处理故障,实现了变电站的综合自动化.     

基于LonWorks技术的智能控制网络在水务工程中的应用

系统地介绍了LonWorks技术在上海太湖流域水闸泵站监控系统中的应用.从硬件电路、控制方法、网络组态、系统架构等方面着重讨论了对闸门控制的智能节点远程监控的实现.     

基于OPC XML-DA技术的远程监控系统的设计

针对目前OPC(Object Linking and Embedding Process Control)组态软件大多只限于本地的监视和控制的情况,通过采用基于Web服务的OPC XML-DA新技术,设计了远程监控系统,使得远程用户可以使用浏览嚣或定制的客户端通过互联网或局域网实现对现场的远程监控.由于采用了标准的OPC接口和Web服务调用接口,方便了系统的扩展和升级.该系统已在变电站监控系统中成功地应用,结果证明,它满足了用户对远程监视和控制的需求.     

OPC技术在数字化变电站智能电子装置中的应用

在分析数字化变电站监控系统与现场智能电子装置（lED）之间进行通信的功能要求基础上,开发出符合OPC数据存取规范的OPC服务器以及连接该服务器的OPC客户端,可以将TCP／lP、RS485等不同物理层的现场硬件设备所采集到的不同类型的参数关联到数字化变电站监控系统中。OPC技术采用客户／服务器模型,建立了一套在软件开发商和硬件生产商之间的开发标准集。阐述并实现了OPC关键性技术,利用OPC技术解决现场智能电子装置与数字化变电站监控系统的站控层之间因通信规约不同而导致的大量开发不同种驱动的问题,代替了传统的驱动程序。最后以线路保护装置NPS9611为例,通过现场测试证实了OPC技术在变电站应用中的可靠性与优越性。     

基于OPC技术的多现场总线控制系统

对现场总线的应用现状进行分析,给出了一种基于OPC技术的多现场总线控制系统的结构框图及OPC Server/Client的开发思维,详细讨论了基于OPC技术实现的DeviceNet、LonWorks及ProfiBus的多现场总线控制系统.系统既能实现基于局域网的本地实时监控,同时又能实现广域网扩展的远程实时监控,为多现场总线控制系统的实现和优化提供了一个可行的解决方案.     

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)

正~~