基于PLC的神经网络PID控制器设计

为了改善工业控制系统的动态调节品质,运用BP神经网络控制算法设计了一种神经网络PID控制器,并给出了基于西门子PLC的神经网络PID控制器的实现方法,仿真和实验结果表明,控制器在改善工业控制系统动态行为上具有突出的优势,对工程应用有实用价值.     

基于PLC的火电厂调速液力耦合系统设计

针对火电厂的调速型液力耦合器,介绍了基于西门子S7-200PLC的控制系统,包括测控对象分析、系统硬件组成和控制程序设计等。运用PID算法调节水泵转速,控制系统提高了整机运行的可靠性和经济性。     

废纸散包机智能控制系统的设计与应用

基于对典型散包机散包过程分析的基础上,设计了一套基于西门子S7-300PLC开发平台的散包机智能控制系统,采用分组解耦检测触发和PID调节相结合的控制算法实现了上料链板电机、散包机和拣选皮带机速度的自动控制以及上料链板机上废纸包数量与位置的准确检测和定位,具有较强的自适应功能;同时,采用西门子编程的DCS系统对系统中的电机、电机实际电流采样、光电开关和接近开关等实现了稳定的检测与控制。     

基于PLC的高炉轴流压缩机控制系统

简要阐述了用PLC实现全静叶可调式轴流压缩机控制的方法,该方法一改过去使用调节仪表与继电器控制系统相互配合或采用价格昂贵的DCS控制系统的控制方法,充分利用西门子高端PLC的高可靠性、强大的网络能力和运算能力,与工业控制计算机构成完整的控制系统,并已经在冶炼高炉轴流压缩机上使用,特别是采用特殊的送风流量、压力调节和防喘振调节算法在提高压缩机工作效率、保护轴流压缩机及安全生产方面取得了良好的效果.     

西门子PLC在液力偶合器控制系统中的应用

针对火电厂的调速型液力偶合器,介绍了基于西门子S7-200PLC的控制系统,包括测控对象分析、系统硬件组成和控制程序设计等。运用PID算法调节水泵转速,控制系统提高了整机运行的可靠性和经济性。     

基于PLC的盾构机推进液压控制系统设计

系统为盾构机提供推进推力和转向功能.针对盾构机推进系统的控制,设计了以西门子S7-400为核心控制器的盾构推进液压控制系统,采用Profibus-DP总线对控制系统ET-200子站I/O点进行控制,分布的控制盾构控制系统的设备.最后在现场设备实现了推进油缸的同步伸缩,掘进的转向,推进速度和推进压力调节的控制,控制系统的...     

PLC闭环PID控制在SVC电压调节中的应用研究

本文简要分析了静止无功补偿(Static Var Compensator,SVC)控制系统的组成和补偿原理.针对SVC电压调节单元,介绍了基于西门子S7-200PLC闭环控制系统中PID数字控制器的原理及PID电压调节控制的实现.实验结果表明S7-200PLC 闭环PID控制在SVC应用中可行,对PID工业控制很有参考价值.     

西门子PLC在液力偶合器控制系统中的应用

针对火电厂的调速型液力偶合器,本文介绍了基于西门子S7-200PLC的控制系统,包括测控对象分析、系统硬件组成和控制程序设计等。运用PID算法调节水泵转速,控制系统提高了整机运行的可靠性和经济性。     

基于西门子AS—Interface总线技术的电梯控制系统

本文着重阐述了西门子AS—Imtefface总线技术的特点及实现方式。简要介绍了电梯控制系统的发展现状和西门子总线技术在电梯控制系统中应用的背景，并从硬件和软件两方面详细说明了西门子AS-Imtefface总线技术在电梯控制系统中的应用以及远程监控的实现。最后对西门子PLC在电梯控制系统中的开发进行了经济技术综合指标分析。     

VIPA 300S系列PLC在电渣炉控制系统中的应用

本文介绍了德国VIPA公司的PLC在冶金行业电渣炉控制系统中应用。作为和西门子PLC兼容的控制系统,VIPA公司的产品具有很强的竞争力,除兼容西门子外还扩充了其它一些非常有用的功能,极大地提高了其性价比。     

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.