基于Web和OPC技术的远程监控系统的研究

在分析基于COM/DCOM的OPC技术应用于工业控制的不足基础上,提出一种基于Web和OPC技术的远程监控系统的实现方法.首先给出了基于Web和OPC技术的远程监控系统的总体架构,接着深入研究了远程监控系统OPC服务器和Web服务器的实现技术,并给出具体的实现方案.提出的实现方案在汽车换档器远程测试系统中得到了验证.     

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.     

基于OPC技术的FF总线远程监控

OPC是一种应用于控制领域的开放式工业标准。通过OPC服务器访问过程数据,上层应用可以不关心底层的硬件特性以及OPC服务器与硬件通讯细节,就可以获得工业现场发送的数据。本文对基于H1总线的OPC服务器与客户程序进行了开发,经调试运行证明其工作良好,实现了对H1总线段的远程监控。     

OPC技术应用于工业测试系统的研究

管理人员通过网络远程监控整个工业测试过程是技术发展的必然趋势。基于丁业标准OPC技术及其应用于工业测试系统的优势，给出了远程测试系统的总体方案，具体分析了OPC服务器、OPC客户程序的实现方法，介绍了基于OPC技术实现远程监控与测试的方法。在基于OPC技术的换档器远程测试系统中得到了验证，这种测试方法弥补了当前测试系统的不足。     

异构网络下的Web监控系统设计研究

针对基于Web的工业信息监控系统的实现,着重研究了控制网络与信息网络之间的数据交换和数据的Web动态发布技术.借鉴基于DCOM的分布式系统设计方式,采用OPC数据交换技术来实现工业现场控制网络与企业信息网络之间的数据共享,并提出了OPC客户端以ActiveX控件的形式在浏览器中与现场监控系统进行数据交换的方案,不但实现了异构网络之间的数据共享,而且改善了传统的以数据库为中心的Web监控解决方案所带来的实时性差等缺点.     

基于OPC技术的电网监控系统RTDB的设计与实现

实时数据库系统能够很好地实现对过程监控系统中的数据管理、交换和共享。该文通过研究现有的实时数据库技术和当前最流行的工业标准接口OPC技术，设计了支持OPC标准的实时数据库系统方案，并根据电网监控系统的实际需要，初步实现了一个实时数据库系统平台，应用开发可以使用该数据库系统COM控件创建任何需要实时数据库支持的监控系统。测试表明该系统能够满足农电网监控系统对数据实时处理的要求。     

基于OPC-XML技术的互联网实时监控系统研究

讨论了基于OPC-XML技术和ASP技术的Web应用。根据OPC-XML纲要，设计并实现了基于OPC-XML技术的互联网实时监控系统。Internet／Intranet用户可以通过Web浏览器从Web服务器得到现场的实时数据，了解现场的实际情况；也可以按照各种方式处理这些实时数据，从而实现了基于Internet／Intranet的远程监控、远程故障诊断、远程指挥调度和远程设备管理。     

基于OPC XML-DA技术的远程监控系统研究

本文基于OPC XML-DA技术,开发了一套针对工业现场远程监控的OPC XML-DA服务端和客户端软件。该系统主要利用Web Service技术,结合.NET框架,将现有的OPC DA服务器转换成OPC XML-DA服务器,同时利用ADO.NET技术将OPC XML-DA服务器中的获取到的数据转存到SQL Server数据库中,并利用GridView控件显示给用户,从而完成了本系统的开发。     

基于OPC XML-DA技术的远程监控系统研究

本文基于OPC XML-DA技术,开发了一套针对工业现场远程监控的OPC XML-DA服务端和客户端软件。该系统主要利用Web Service技术,结合.NET框架,将现有的OPC DA服务器转换成OPC XML-DA服务器,同时利用ADO.NET技术将OPC XML-DA服务器中的获取到的数据转存到SQL Server数据库中,并利用GridView控件显示给用户,从而完成了本系统的开发。     

OPC XML-DA网关的设计与实现

为了促进工厂数据跨平台、跨层次交换的要求,OPC基金会制定并发布了基于Web服务技术的0PC XML—DA接口规范。通过设计并实现的OPC XML—DA中间层网关,可以完成对现有的基于OPC COM接口规范的工业数据的XML化工作,很方便地实现了现存的基于COM技术的OPCDA服务器的升级,使得这两种接口可以和谐地共存。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

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.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.