PLC的发展

本文着重描述了PLC的开放性．硬PLC与软PLC在离散过程控制、连续过程控制以及运动过程控制的应用前景。同时说明PLC在工业自动化套件中的作用。     

基于PLC的发动机油封供油装置控制系统

针对新型飞机发动机油封供油装置工艺参数和过程控制需要.研究了以嵌入式PLC实现过程控制、液位和温度控制的方法,给出了一个PLC在供油装置中的典型应用.     

基于PLC改造换热元件试验台系统

论述了PLC在换热元件试验台系统中的应用,详细介绍PLC与上位机的通信,PLC与RS485网络中的信号采集模块的通信过程,以及几个加热器的PID过程控制等。     

三菱A系列PLC在以太网中与上位计算机通信的实现

以太网技术在工业自动化和过程控制领域已经得到广泛应用,本文介绍了PLC与以太网的结合方式,主要分析应用组态王软件,实现三菱A系列PLC在以太网中与上位计算机的通信功能。     

PKS+TRICON+PLC结构在神华煤制油过程控制中的应用

PKS+TRICON+PLC结构是神华煤制油过程控制中的主导控制结构。对控制系统组态中如何完善软、硬件的组态,提高煤制油过程控制应用水平进行探讨。     

LE控制器与ABB变频器通讯应用

LE系列可编程控制器(PLC)是和利时公司新推出的高性能PLC产品。LE系列PLC产品集小型PLC产品灵活的结构和中型PLC产品强大的功能优势于一体,可以广泛应用与恒压供水、市政供暖、暖通空调、机械加工等行业及中小规模过程控制领域。     

PLC的硬件架构及其在压力控制系统中的应用

主要讲述了可编程逻辑控制器PLC的硬件架构,了解了整体式PLC和组合式PLC的异同。列举了PLC的基本组成单元及其特点。重点讲述了PLC在压力控制系统中的应用应注意的问题及其应用,PLC抗干扰能力强,适用于工业现场,具有可靠性高、维护容易等特点,为压力过程控制系统的连续、稳定、安全运行提供了保证。     

基于Delphi7.0的上位机与PLC的通信

本文介绍在将计算机与PLC结合起来,组成高性能价格比的小型集散控制系统―热电厂循环水过程控制系统中,在基于Delphi7.0上位机监控软件开发环境中如何实现上位机与S7-200系列PLC之间通信。     

PLC控制系统设计的实用技术

一、引言 在可编程序控制器（PLC）的实际应用中,由于其机型种类繁多,编程器、编程语言各异,控制方式又分逻辑控制、顺序控制和过程控制等,因此,在实现PLC控制方案时,在方法上将不尽相同。本文详细讨论PLC硬件配置及软件设计的一些问题。     

PLC在电厂水处理生产的应用

介绍了PLC在电厂水处理过滤器及阴阳双室浮动离子交换器中自动过程控制的实际应用，对该系统的工艺过程、PLC选型、系统软硬件设计作了介绍，给出了系统原理图及自动控制软件流程图。     

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.