基于变频器的实时控制应用及VB实现

以三菱FR—F540变频器为例,介绍了关于变频器的具体物理连接方法和基于VB的计算机端控制软件编写,提出了以字符串形式代替Byte数组作为通讯缓冲区数据进行数据交换的思路,实现了通过计算机对变频器参数的设置和读出、控制运行以及运行参数监视等功能,该方法同样适用于其他类型的变频器控制。     

基于PLC的矿热炉低压无功补偿监控系统的研制

为提高大型矿热炉的工作效率,使矿热炉具有良好的经济技术指标,介绍一种针对矿热炉的自动无功补偿监控系统,该系统中的PLC从电量采集模块获得无功功率、功率因数、谐波参数等电网运行参数,控制其输出节点动态调节电容投切的数量,实现功率因数补偿,通过RS485总线实现远程计算机联网.该系统已在冶炼企业得到成功应用,并通过现场运行证明了该系统的稳定性.     

基于CMOS激光位移传感器的板厚测量系统

为了提高板材厚度参数的测量效率和精度,本系统利用CMOS激光位移传感器,通过激光三角法实现板材厚度的测量,并利用MPC08运动控制卡控制交流伺服系统实现激光位移传感器的测量定位,同时计算机对采集数据进行分析处理、显示和存储.实验表明该系统运行稳定可靠,测量效率大幅提高.     

大惯性、变参数间歇式化学反应釜的过程控制方案探讨

本文用机理分析和实验测试相结合的方法,建立了一个适合单板计算机进行数字控制的大惯性、变参数间歇式化学反应釜的数学模型和过程自动控制方案。设计中采用设备配置最少的原则,将时变分布式参数分段集中化;用计算机模拟现场运行而初步整定控制算式参数;采用子过程及其分段的控制方法以提高过程控制品质。     

基于Vega/MFC的直升机视景仿真设计

由于在视觉上的逼真效果,视景仿真在飞行控制方面得到了广泛应用;通过Visual C++/Creator/Vega的结合使用,完成了一个完整的直升机视景仿真系统,包括控制软件和视景软件两部分;控制软件是用MFC完成对HUD画面和飞行数据的实时显示,以及飞行参数输入等;视景软件主要包含了某型号直升机Creator模型的建立、场景的配置、驱动程序的编写等;控制软件与视景软件分别在两台计算机上运行,控制计算机解算出来的数据通过Socket通讯传输给视景计算机,驱动程序根据相应数据驱动Vega视景进行相应姿态、音效等视景演示,在验证飞行控制律和视觉上有很好的效果.     

探析"大数据"时代的计算机处理技术

如今,计算机技术得到了广泛的应用,但是,计算机在运行的过程中会产生很大的数据,这些数据要得到高效率的处理,因此,计算机要具备一定的信息处理的能力.计算机在进行数据处理的过程中,要实现高效的数据转化,而且在数据处理的过程中要具备安全性.本文主要分析近年来计算机应用技术的发展情况,分析在大数据背景下计算机的发展趋势.     

基于最小二乘法舵机测控参数的修正

本文针对使用电位器作为角度传感器的测控系统.角度的实际值与电位器的电压采样值呈线性关系,但测控环境中存在较多干扰,使实际值和采样值偏离设定的线性关系.为了提高控制器控制性能,需要修正控制器运行参数,本文采用最小二乘法[1]处理采样数据,以提高曲线拟合和修正控制器参数.     

SCADA系统市场分析

SCADA(Supervisory Control and Data Acquisition)即数据采集与监控系统.作为生产过程和事物管理自动化最为有效的计算机软硬件系统之一,为实现远程自动化数据采集和远程控制提供了最基本的平台,对现场的运行设备进行监视和控制,以实现数据采集、设备控制、测量、参数调节以及各类信号报警等各项功能.本文所指的SCADA系统既包括关注上位机的软硬件系统,也包括下位机的数据采集系统.     

大数据时代人工智能在网络中的应用

云计算、大数据的出现和发展引领社会步入了全新的信息科技时代.如今大数据、人工智能等技术被广泛应用到人们日常生产生活的各个方面.在计算机网络技术领域中,人工智能的运用使网络的技术水平和运行能力得到了进一步提升,计算机已不再是传统意义上的独立工具.为提高计算机的数据处理能力和准确性,更好地掌控人工智能技术的应用场景,本文就大数据时代人工智能在计算机网络技术中的运用展开研究.     

变参数压力对象的自适应PID算法

随着工业应用的逐渐复杂和控制精度的提高,常常会遇到变参数控制的问题,经典控制算法对此往往难以奏效.通过对导弹补燃室变参数控制问题的研究,提出一种自适应PID控制算法.该方法以实验研究为基础,利用分段整定得到不同工况下的控制参数,且可以随着系统运行进行自适应调整.实验结果证明了该方法的可行性.     

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.