虚拟仪器与PLC串口通信的实现

介绍了一种在线测量设备中虚拟仪器与可编程控制器(PLC)串口通信的实现方法。在LabVIEW环境下工控机与PLC串口通信可靠性差，通过采用最佳信息冗余法保证了信息传递的可靠性，使通信成功率达到100％，同时提高了通信传输效率，满足了在线测量的要求。现场使用表明该通信方式运行稳定。     

基于FPGA的多功能多路舵机控制器的实现

利用现场可编程门阵列(FPGA)构建了一个可编程片上系统(SOPC)实现能同时控制多个伺服舵机的控制器,用于遥控/自控飞艇的控制。该片上系统的硬件部分主要由串口通信模块、NIOS-IICPU模块、脉宽调制(PWM)信号发生模块、PWM信号脉宽计数模块以及多路开关模块组成。软件部分主要是串口通信软件。其中,PWM信号发生模块可通过串口通信灵活地设置每路PWM信号的占空比。仿真和实验结果表明,该控制器可根据串口通信数据,可靠地对每个伺服舵机进行独立控制,且舵机运行平稳无颤振。     

三菱小型PLC与计算机的通信设计

本文以三菱小型可编程控制器为例,介绍了PLC与计算机之间的串口通信设计,重点介绍了利用VB6.0中MSCOMM控件进行串行通信的实现方法。     

基于LabVIEW和FPGA的串口通信系统设计与实现

串口通信方式是工业控制中常用的通信方式,常规的串口通信编程采用动态链接库的方式,编程比较复杂。设计了一种基于LabVIEW的电机控制系统,通过LabVIEW中的VISA控件实现了PC机与现场可编程门阵列(FPGA)的串口通信,控制电机的运行。与常规的方法相比,此方案提高了数据传输的实时性而且降低了编程难度。系统具有数据交换、仪器状态检测、数据读取、命令控制等功能。在实际运行中,该系统操作简单,响应速度快,能够连续、动态地改变电机的转速,实现了工业控制的自动化。     

可编程计算机控制器及其在塑料挤出机中的应用

介绍了可编程计算机控制器(PCC)的特点及其在塑料挤出机上的应用。通过软、硬件的分析，说明了可编程计算机控制器比常规可编程控制器性能更加优越，特别是它的多任务处理操作系统和通信能力。PCC实现挤出机温度的智能化控制；通过CAN现场总线实现主站PCC2005与从站PCC2003之间的通信。     

PLC与单片机串行通信的应用

本文以工业大功率微波炉控制系统为例,着重介绍了可编程控制器(PLC)与单片机串行通信的实现方法,该方案实现简单,通讯可靠.在实际应用中取得了良好的控制效果.     

基于无线通信的水厂分布式监控系统

基于无线通信和串口通信技术,设计了一种分布式的水厂实时监控系统,阐述了监控系统的原理、过程及软件、硬件的配置.实现了可编程控制器、通信技术、遥控遥测技术的结合.     

视窗环境下欧姆龙PLC的实时通信

本文主要介绍了利用WINDOWS定时器和VC 串口编程实现与OMROM可编程控制器的实时通信，具有简单灵活的特点，在工程应用中有实用价值。     

基于DSP的RS-232、RS-422串行收发系统设计

针对在噪声干扰比较大的工业环境下对RS-422通信的需求,该设计采用TMS320F2812作为主处理器,利用外部接口(XINTF)片内的两路SCI异步串口,并通过可编程逻辑器件EPM240T100C5N(CPLD)两片MAX3160连接,实现了上位机和下位机之间、下位机和下位机之间的RS-232通信、RS-422通信.     

一种基于PDA的掌上控制器的通信软件设计与实现

串口通信广泛应用于工业控制领域,PDA利用自身串口通信功能和使用方便的特点,使得以它制作的线控掌上控制器具有广泛的应用范围和良好的应用前景.介绍了利用EVC实现PDA和VxWorks通信软件的关键技术.     

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.