基于OPC技术电厂实时数据管理系统

本文针对电厂实时数据管理系统的应用需求，提出基于OPC技术实现电厂实时数据管理系统的总体结构；并以数据访问组件为例介绍了利用OPC技术实现发电厂实时数据管理组态平台DL-PASA-Real的方法。     

基于OPC技术的电厂实时数据管理系统

本文针对电厂实时数据管理系统的应用需求，提出基于OPC技术实现电厂实时数据管理系统的总体结构；并以数据访问组件为例介绍了利用OPC技术实现电厂实时数据管理组态平台 DL－PASA－Real的方法。     

OPC数据访问服务器的研究与实现

首先介绍了OPC(OLE for processcontrol)及其相关技术,提出了OPC数据访问服务器的组成模型。在分析OPC数据访问服务器两种开发模式的基础上,给出了以WTOPCSvr.DLL工具包为平台,使用工具开发模式实现其开发的主要步骤。重点阐述了基于PA150通信协议,OPC数据访问服务器中硬件驱动通信模块采用串口编程方式实现的方法,并给出了通信两端的主要配置过程,基于该方法和过程的OPC数据访问服务器已成功应用在某煤矿的计算机监控系统中,取得了良好的效果。     

OPC规范及其在交换式工业以太网中的应用

重点介绍了最新的基于Version2．05A OPC数据访问标准，叙述了OPC技术在交换式工业以太网中的实时数据采集方面的应用，同时介绍了交换式以太网的硬件组成。OPC应用很好地实现了系统的高效性和实时性。     

OPC技术在油田优化监控系统中的应用研究

针对远程监控系统的发展趋势和目前工业控制中对实时传输的实际要求,OPC技术提供了标准化访问接口,应用程序可以使用一致的方式访问设备中的数据。本文研究了油田优化监控系统的总体结构,并通过OPC客户端将WinCC中的实时数据转储到SQL数据库中,解决了组态软件中实时数据转储到标准数据库的难题,最后给出了OPC客户端的实现过程。     

OPC技术及其对工控系统开放性的影响

OPC技术为组成开放式工控系统提供了有效工具,促进了工控系统朝着开放的方向发展.本文在简述OPC技术及其应用背景的基础上,讨论了OPC技术在信息集成中的作用:通过OPC接口实现对现场实时数据的一致访问,实现不同应用软件间的即插即用,实现控制系统的集成与数据共享.     

力控~组态软件的OPC支持

力控实时数据库支持OPC标准，作为OPC客户程序，它可以从其他OPC服务器程序中访问数据。与DDE类似，当力控数据库作为客户端访问OPC服务器程序时，是将OPC服务器程序当作一个I/O设备。数据库中的点参数通过I/O数据连接与OPC服务器程序进行数据交换。OPC适应范围力控利用OPC技术，主要实现：(1)在线数据监测实现了应用程序和工业控制设备之间高效、灵活的数据读写。(2)报警和事件处理提供了OPC服务器发生异常以及OPC服务器设定事件到来时，向OPC客户发送通知的一种机制。(3)历史数据访问实现了读取、操作、编辑历史数据库的…     

基于B/S结构下分布式控制系统的实时监控

OPC技术为组成开放式工控系统提供了有效工具，促进了工控系统朝着开放的方向发展。本文在简述OPC技术及其应用背景的基础上，讨论了OPC技术在信息集成中的作用：通过OPC接口实现对现场实时数据的一致访问，实现不同应用软件间的即插即用，实现控制系统的集成与数据共享。     

OPC数据访问服务器实现机制研究

概述了OPC数据访问服务器的作用,讨论了它的实现机制,以及OPC服务器对象、OPC组对象、OPC项对象之间关系,具体介绍了OPC服务器对象、OPC组对象和OPC项对象实现方法。简要地介绍了OPC数据访问接口的功能。     

基于CART的焦化生产实时数据库设计

研究钢铁企业焦化生产实时数据采集系统,针对过程控制系统中的海量数据,设计基于CART数据库平台的焦化生产实时数据库系统,并给出具体实现方法。系统利用数据接口程序采集过程控制中的实时数据,通过办公局域网实现数据的传输与多用户共享,利用CART数据库平台实现生产实时数据的访问及管理应用。在实现过程中采用DDE、OPC、多线程、Windows服务等多种技术,保证了软件的实时性。     

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.     

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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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