原油试验环道SCADA系统的实现

提出了一种采用以操作员过程管理工控机为上位机;可编程控制器(PLC)为下位机的控制模式,组成SCADA系统.PLC采用ControlLogix系列产品,实现了远程数据采集、控制执行机构运转、执行机构的故障检测等功能,同时采用了双PLC(CPU)运行模式.实现了控制系统的热备功能;上位机使用Citect工业控制组态软件开发监控软件,完成数据处理、各类显示、报警、报表、打印、功能转换等功能.经过试运行,证明该系统操作方便,具有优良的人机界面及较高的可靠性.     

双离合变速器比例阀耐久测试台控制系统的设计

介绍了双离合变速器比例阀耐久测试台控制系统的设计,首先描述了系统方案设计,包括油箱系统、压力油路和温度油路。然后,阐述了上位机加下位机组成的控制系统。系统上位机采用西门子工控机、NI数据采集卡加LabVIEW软件的模式,下位机使用S7-300 PLC进行控制,上下位机之间采用OPC技术进行通信。该耐久测试系统具有自动化程度高、操作简单、安全可靠以及节能的优点。     

PLC在焦化厂运料小车自动控制系统中的应用

本文介绍了由下位机(PLC)和上位机构成的焦化厂运料小车自动控制系统.下位机(PLC)在现场可以进行系统控制、参数设置.上位机进行远程管理和打印,整个系统以下位机的工业级可编程序控制器为核心,实现自动化控制,该系统能确保运料的及时和可靠,降低系统的运行费用.     

基于双下位机的疲劳试验机控制系统设计

为了有效解决目前国内液压疲劳试验机由于长时间实验造成容易死机和数据丢失,以及进口动态疲劳试验机价格昂贵且操作不便等问题,提出了基于LabVIEW软件平台开发上位机,以及EDC220控制伺服阀和S7-300 PLC控制工艺流程的双下位机的液压疲劳试验机测控方案。LabVIEW上位机通过以太网与双下位机进行高速通讯,进行控制数据和采集数据的交换;整个控制系统通过长时间的运行测试,系统稳定高效可靠运行,没有死机和数据丢失的现象发生,有效地解决了上述问题,达到了较为满意的效果。     

基于SERCOS总线的分布式控制系统设计

SERCOS总线是目前用于数字伺服和传动数据通信的唯一国际标准,具有开放性、兼容性、实时性等优点。本文设计了基于SERCOS总线的分布式控制系统,采用上位机和下位机结构,利用配置了SERCOS接口卡的PC机作为上位机,通过光纤环路向下位机发送指令。下位机由DSP控制器、电机驱动和反馈电路等组成,对电机进行位置闭环控制。实验结果表明,SERCOS总线成功地实现了上位机对电机的实时监控。     

电液伺服综合试验机的修复改造

为了解决电液伺服系统因使用年限太久,各模块出现不同程度的老化,且操作界面不友好导致系统不能正常运行的现状。现提出了对原有的电液伺服试验机进行改造,替换原系统的控制设备和数据采集设备,更新原系统的软件,设计一种新型电液伺服综合试验机系统。应用下位机PLC作为控制器替代原系统的ISA接口控制板,连接上位机LabVIEW作为显示界面为动静态实验提供详细的资料。对改造后的系统进行了钢板弹簧试验检测,并对检测结果进行分析,各试验数据在电液伺服试验机国家标准允许的误差范围内,试验结果表明检测系统稳定性好,控制性高,使用方便及可靠有效。     

基于LabVIEW与Modbus/TCP的伺服电机控制系统

提出一种基于LabVIEW与Modbus/TCP协议的伺服电机控制系统的设计方法.该方法采用工控机与MP2310组成控制系统,实现对两台伺服电机的使能、正转、反转及速度设定等功能,给出了系统的硬件设计,并重点给出了基于LabVIEW的上位机软件设计和下位机的编程设置;测试结果表明,该系统能够实现对伺服电机进行有效控制.     

基于LabVIEW和FPGA的存储器测试系统设计

为满足多种存储器的测试需求,基于LabVIEW和FPGA设计了一套存储器测试系统;系统分为上位机及下位机两个部分,其上位机部分采用LabVIEW开发测试控制器,完成系统的测试控制、测试数据的采集与存储及对传统仪器的程序控制;下位机部分采用FPGA实现测试所需要的测试激励生成,经实测验证了系统可以对专用存储器进行自动化监控测试,具有测试成本低测试灵活及可扩展性强等特点。     

一种新型智能化测控系统的研究与实现

本文采用下位机硬件控制和上位机软件监视架构.在下位机控制系统中,通过PLC(可编程逻辑控制器)来采集与处理现场数字量信号、模拟量信号以及脉冲信号,采用RS485协议与液位仪二次表通信读取数据,实现对泵和电动阀的自动控制.在上位机监视系统中,采用Ifix组态软件开发人机界面,生产实时状况直观形象.     

基于IPC与运动控制卡的机器人运动控制系统

工控机(IPC)和运动控制卡组成的开放式机器人控制系统,具有可靠性高、信息处理能力强、开放程度高、运动轨迹准确等优点,利用其来进行六自由度关节机器人的运动控制系统的开发.IPC实现上位机功能,完成人机交互、运动学运算等任务.下位机采用PMAC运动控制卡,对各关节电机进行伺服控制.上位机基于Visual C++编程,通过调用PMAC的动态链接库编写上位机人机界面实现对PMAC卡的控制,另外介绍了伺服驱动器的设置以及PMAC的PID调节.实践证明这套系统工作可靠,完全满足要求.     

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。     

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。