Windows98下IPC与可编程控制器的实时通讯

文章阐述了在Ｗｉｎｄｏｗｓ９８下进行实时通讯的一种方法，提出了满足本课题通讯要求的软、硬件解决方案。经过现场实际运行，满足了生产的实际需要，是一种方便的低价格工业控制环境的实时通讯方案。     

基于Windows的新型DCS的设计与实现

本论述了以Windows作为开发环境设计研制的一种新型分布式控制系统。本系统建立了DCS通讯系统,实现了DCS内部及各DCS间实时通讯,使DCS中信息的分布并行处理成为可能;实现了任意组态环境下的控制器参数的在线优化。     

一种实用的远距离数据通讯技术

针对以ＩＢＭ－ＰＣ及其兼容机做为上位机，以ＳＴＤ系列工控机做为下位机组成的工业控制系统，介绍一种远距离实时通讯方案。并讨论了通讯硬件接口电路及软件的设计方法。实际应用证明，该通讯系统简单可靠，能满足实时控制的要求。     

一种用于单片机开发系统的实时交换数据系统的软硬件实现

本文介绍了自选研制的单片机开发系统中一种实时交换数据的系统,这是一种实时的单片机与微机的交互系统,可以在一台微机和一个编程环境下实现串行通讯,CAN通讯,实时与应用程序的数据交换,从而大大加快单片机应用程序的开发。     

基于嵌入式PC104总线的智能四串口通讯模块的设计

提出了一种利用嵌入式微处理器设计的智能四串口通讯模块.主、从CPU协调控制信息传输, 由从CPU负责串口的接收和发送,使主CPU的通讯任务占用很小的系统资源,并使用CPLD技术及高速串口集成芯片.说明该串口通讯扩展模块具有智能可编程、实时并行的特点,能够满足实际工业控制对象的的需求.     

基于串口通讯的打包数据的接收方案

串口通讯是上微机与下微机通讯过程中一个较为常见的问题。本文提出了一个串口通讯中打包数据的接收方案,并用VB语言对此方案进行了实现。经过实际测试,该方案不仅能满足实时通讯的要求,而且保证了数据包传送的正确性。     

DSP技术在仿真器中的应用研究

通讯技术在仿真器的设计中有着非常重要的作用,通讯速率的快慢直接影响到仿真器实时性问题,对于仿真模型的实时解算和图形的实时形成尤为重要,从而决定了仿真效果.传统的通讯技术大多通过RS232串行口或者RS485来实现,但是传输速率较低.该文提出了一种以DSP为核心技术的通讯接口,解决了传统的通讯接口传输速率较慢的问题.该通讯接口板基于PCI总线,两个仿真器间通讯利用DSP的双缓冲的串行口的收发操作来完成,可以满足实时通讯的要求.     

Siemens R30与PC机并行通讯研究与实现

研究了困扰实际工程应用中跨操作系统并行数据传输技术瓶颈问题,并给出了一般的解决步骤。以某冷轧厂技术改造为背景。分析了该冷轧计算机控制系统中过程控制机与最佳化控制机间的并行通讯,用PC机代替最佳化控制机实现与过程控制机（Siemens R30）实时在线传输轧机生产电文。运用数据采集、单片机、CPLD等相关技术,设计和建立了基于Windows的PC机与Siemens R30实时并行通讯系统。该系统为研究轧机轧制模型、控制模型等提供了实时在线数据环境,满足了该厂技术改造的应用需求。该系统在某冷轧厂已经投入实际使用。运行稳定、可靠。     

MRP协议在EPA实时以太网中的研究与应用

针对目前现场工业环境中EPA实时以太网通讯时数据传输的可靠性、确定性与实时性难以得到保证的问题,依据IEC62439网络冗余协议的特点,提出用于解决这一问题的EPA实时以太网网络MRP冗余通讯协议。设计并实现了应用于EPA实时以太网中的MRP网络冗余通讯和网络拓扑发现系统,当网络产生动荡后,可以以毫秒级的网络收敛速度使EPA实时以太网的网络再一次达到网络通讯稳定状态。最后,本文对该系统网络收敛性和网络拓扑发现功能进行了测试。测试结果表明,MRP冗余通讯解决方案能够满足EPA实时以太网的网络性能需求。     

CANopen协议在机器人控制器中的应用

针对当前机器人控制器中通讯方式不统一,复用性差的现状,本文提出了基于CANopen协议的机器人控制器实时通讯方案。首先介绍了控制器局域网络(CAN)的高层协议CANopen,并结合机器人控制器与多个电机驱动器通讯的实际需求,实现了基于CANopen通讯协议的机器人控制器,并在实际机器人系统中进行测试。实验结果表明基于CANopen通讯协议的机器人控制器可以满足机器人控制系统的实时性和灵活性要求。     

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.