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。     

基于OPC技术的先进控制软件的集成

在石化行业应用先进控制技术的一个关键问题是如何实现先进控制软件与DCS系统之间可靠的数据通信以及运行平台的开发,应用OPC技术实现先进控制软件与DCS系统之间的无缝连接,使基于Windows平台的先进控制软件具有设备通用性和软件通用性,对于在石化行业广泛应用先进及优化控制具有重大意义一本阐述了基于OPC技术的先进控制软件的设计方法,并将该方法在石油大学胜华炼油厂催化车间进行了应用。     

智能楼宇能耗监控系统的设计与实现

采用WSN( Wireless Sensor Networks)技术和OPC( OLE for Process Control)技术,设计一套智能楼宇无线分布式能耗监控系统.系统分为能耗信息采集和能耗信息监控模块.信息采集模块采用WSN技术对监控数据进行采集上传;能耗监控模块在对OPC规范进行分析的基础上完成OPC能耗数据访问服务器和OPC能耗数据监测系统的设计与实现.系统经过几个月的实际应用,性能良好,运行正常.     

基于OPC技术垃圾焚烧数据采集系统的设计与实现

针对光大环保项目公司在垃圾焚烧过程中实时数据的采集问题,提出并开发了基于OPC接口技术的数据采集系统。该系统采用面向对象的程序设计理念,能同时访问多个OPC服务器进行数据采集,并提供COM接口、共享内存技术以及匿名管道的通讯方式给优化控制程序、人机界面以及后台历史服务程序使用。该系统在现场运行过程中可以为垃圾焚烧的整个流程提供高效可靠的信息传输,在很大程度上解放了现场专工的劳动力。     

OPC技术在卷烟机械设备中的设计与实现

针对卷烟机械设备的智能化改造,为满足多组设备实时集中监控功能,提出了具有OPC功能的上位机系统设计方案,完成了对卷烟设备上位机系统的改进设计。通过对工业以太网实现OPC服务器与西门子PLC之间实时通信的具体方法介绍,以及OPC客户端程序编写和实时数据库的建立,实现对现场PLC数据交互访问和机组数据信息保存,从而达到对卷烟机械机组远程监控的目的。该系统实际运行过程中稳定、可靠,便于生产操作人员对机组的集中监控,避免设备故障产生的不良影响,提高了生产效率。     

基于OPC技术的二级配水系统的数据交换

介绍了OPC技术、OPC服务器接口及其数据存取规范,利用西门子公司提供的OPC自动化接口,基于VB6.0环境开发了过程控制级计算机与PLC之间通信的应用程序,实现了连铸二冷配水过程二级控制系统数据的在线动态交换.实践证明系统的实时性和可靠性满足控制要求.     

PID优化整定系统中OPC接口的研究与应用

OPC是一个开放的工业接口标准,被用于过程控制和制造业自动化系统。本文通过OPC接口在PID优化整定系统中的应用,介绍了DCS和OPC的基本概念,以及OPC接口的相关知识和数据存储访问方式;同时结合实际介绍了为实现各系统间数据交换,应用OPC通讯技术所搭建的系统网络结构,以及OPC服务器端和客户端开发的基本步骤,数据存储过程的实现;最后,讨论了PID优化整定系统中OPC接口的应用在工业现场领域中的优点以及发展前景。     

基于OPC UA的船舶数据监控系统的设计与实现

设计一种基于OPC UA的船舶数据监控系统,采用OPC UA协议解决船底层不同硬件接口和数据传输协议多样所带来的数据采集和传输的通用性问题,有效地监控设备实时工作状况。数据采集端将数据转换为统一的OPC UA格式,OPC UA客户端通过统一的数据传输接口获取采集端的数据并把数据存储到数据库中。通过Django、JavaScript等相关Web技术,建立B/S模式下的数据可视化平台,以图表形式显示实时数据,使船员及时掌握设备运行状态并进行有效决策,促进船舶领域向着信息化、智能化的方向发展。     

基于OPC XML-DA的风力发电机移动远程监控系统

针对风力发电机远程监控问题,设计并实现一种基于移动互联技术解决方案,开发了基于Android操作系统的风力发电机移动远程监控手机客户端,通过Internet实现数据交互,开发了基于OPC XML-DA规范的的状态及故障的监控软件,解决硬件设备之间通讯接口的兼容及跨平台的问题.本文中介绍了该监控方案的总体框架,描述了OPC XML-DA服务器、移动客户端的设计思想,并进行了功能实现.测试结果表明,本系统能够高效的完成对风力发电机的实时监控.另外,该系统还能够应用于智能家居领域和各种工业控制领域.     

基于OPC技术的在线数据采集接口开发与应用

针对计算机在工业自动化领域的智能仪器仪表现场运行数据的直接高速采集到应用软件的实际,提出了一种使用基于OPC工业控制软件接口标准的自动化接口(OPCDaAuto),遵循OPC数据访问规范,通过RSLinx OPC服务器提供通讯通道,实现上位机与PLC的数据采集的接口程序的开发方案,并在工业现场得到实际应用,运行结果表明,接口程序通用性和稳定性优良。     

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。     

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.     

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.     

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     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.