基于LabVIEW与PLC的泵组试验台

为了验证泵组工作的可靠性,基于LabVIEW和PLC开发了一套试验台。使用PLC控制系统完成对试验过程的控制和数据采集,利用LabVIEW软件平台实现数据分析和结果判定,同时运用OPC技术完成LabVIEW与PLC之间的数据通信。低成本、高性能、高效便捷地实现了泵组试验台测控系统的开发。     

基于TCP/IP协议的测控系统的开发

为实现复杂工业现场下的设备测试,本文介绍了一种基于TCP/IP协议的测控系统,该系统采用客户机/服务器模型。测控系统的中央控制计算机与子测控系统的下位机间为“一对多”通讯,中央控制计算机作为服务器,子测控系统的下位机作为客户机;子测控系统的上位机与下位机之间采用“一对一”网络通讯,子测控系统的下位机作为服务器,上位机作为客户机。中央控制计算机采用LabView开发,子测控系统的上位机与下位机采用Visual C+ 6.0开发。最终实现了测控系统的TCP/IP通讯,完成了复杂工业现场下的测试工作。     

基于Labview的卫星电源地面监控系统研究

采用Labview平台、基于SQL Server设计并开发了一套能在卫星电源分系统的设计和开发阶段对其充电进行均衡控制并对相关性能进行测试的地面监控系统;介绍了卫星电源地面测控系统的组成和软件总体框架,详细阐述了软件主要功能,包括实时监测程序、在轨状态仿真控制程序、数据的保存、回放和维护程序等关键技术的实现方法;测试结果表明,该监控系统监测数据准确,采样精度优于0.1%,运行高效可靠。     

食盐碘含量在线测控系统的数据采集与控制

为实现食盐碘含量的数字化检测和优化控制,设计了一套基于组态软件平台开发的食盐碘含量在线测控系统。运用组态王编制了数据采集与控制组态软件,基于三菱PLC进行数据采集和转换,并通过上位机的组态软件进行显示和控制。系统运行结果表明：整套模拟系统实现了数据实时监测和故障报警分析等模拟装置的运行控制。     

基于LabVIEW的车辆冲击试验台测控系统设计

对应用于铁道机车车辆缓冲器及车体进行冲击试验的试验台测控系统进行了研究;基于LabVIEW技术,设计了车辆及其缓冲器冲击试验台的测控系统;对测控系统构成及原理进行了介绍,并描述了电机控制系统和软件功能;借助于计算机多功能接口卡,由计算机完成冲击试验台的轨道角度以及车辆的锁闭和释放控制,通过不同轨道角度的控制实现对不同的车辆冲击速度的控制,并可完成对车钩、缓冲器及车辆冲击应力的测试;最后进行的试验表明试验台达到了设计要求.     

基于VXI总线和PID控制的燃调试验台测控系统设计与实现

首次在某型航空发动机燃油调节器试验台测控系统中设计使用了基于VXI总线的数据采集系统和集散控制系统;在VC＋＋环境下,采用科学的设计方法开发了功能齐备、界面友好的应用软件;通过调用数据库中的相关信息,可以灵活配置应用软件;实现了试验控制,安全保护,对重要参数的PID闭环控制,数据采集、处理、自动记录和重复利用等功能;应用结果表明：系统稳定可靠,测控精度高,提高了工作效率,完全满足试验要求;可见,由标准VXI总线设备和在VC＋＋环境下开发的高性能应用软件组成的测控系统,能够大大提高复杂测控试验的精度和效率。     

基于LabVIEW多通道S参数测试系统设计

随着现代工业的发展,对测控仪器的要求越来越高.虚拟仪器(VI-Vinual Instrumentation)因为其具有优秀的可扩展性、低廉的成本、方便的操作得到了广泛的应用.在虚拟仪器开发技术中,运用最为广泛的是N1公司的LabView.本文使用目前测控领域新型的虚拟仪器技术及LabView7.0开发平台,结合测试功能要求,阐述了基于LabView控制网络分析仪的多通道系统的散射特性的测试系统的设计,详细介绍了测试系统的硬件和软件设计.目前,该测试系统已经应用于西门子的核磁共振测试系统,投入运行,且效果良好,可靠性高.     

MoviconX组态在气瓶阀型式试验测试系统的应用

采用三套Movicon X组态软件和两套PLC测控装置,设计了一套高压气瓶阀型式试验测试系统.介绍了整个测试系统的技术实现.文章详细介绍了测试系统的数据库定义、驱动程序通讯设置、界面设计、动画连接和网络连接等.系统可对气瓶阀尤其高压气瓶阀是否符合相关标准进行全面的测试.     

液压阻尼器动态试验台测控系统设计

对应用于液压阻尼器动态试验的试验台测控系统进行了研究;基于LabWindows∕CVI技术,设计了液压阻尼器试验台的测控系统;对试验台测控系统构成及原理进行了分析介绍,并描述了驱动电机控制系统和软件功能;借助于信号采集板卡和运动控制板卡,由工控机完成液压阻尼器试验台的输出转角测试及驱动电机的控制;通过0～60°不同旋转角度幅值和0.01～4.8Hz不同频率的设定实现对不同角速度的控制,并完成阻尼器实际转角、扭矩和阻尼比的测试计算;最后的试验表明了液压阻尼器动态试验台各项指标均达到设计要求。     

称重法低温流量校准测控系统设计与实现

针对称重法低温流量校准系统中介质环境的安全性及系统工艺流程的复杂性,设计开发了一套基于工业控制计算机的板卡的测控系统,实现系统执行的自动化;从校准系统的原理、测控要求及工作流程介绍了系统的总体设计思路,从系统的硬件组成及功能实现了系统的硬件设计,考虑软件的可视化及模块化原则,攻克了软件实现的主要技术要点;通过对系统软硬件调试,该系统功能完备、可靠、方便,满足低温状态下流量计校验的要求。     

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.