智能电表的数据抄读新方法

智能电表大多采用MODBUS协议或者645协议进行通信,通信速率不高,这对于智能电表大量数据的传输不方便。提出基于PROFIBUS的智能电表数据抄读方法及系统,此系统包括基于PROFIBUS通信的主站--可编程逻辑控制器(PLC)和从站,主站和从站是基于PROFIBUS总线通信连接的,主站由西门子PLC/CP5611网卡和STEP 7编程软件、WINCC监控软件等组成,从站为具有PROFIBUS模块的智能电表;该PROFIBUS模块与智能电表中的微控制单元(MCU)进行连接,作为智能电表的一部分。这种基于PROFIBUS的智能电表数据抄读方法及系统易于实施,数据传输快,且通信速率可以达到12Mb/s。     

基于CANopen协议的分布式控制系统I/O从站设计

针对印刷机外围设备多分散、数据传输信息量大、实时性和可靠性要求高等问题,设计了一种基于CAN现场总线的分布式控制系统;监控主机运行软PLC通过PC-CAN卡与现场I/O从站进行通信,形成分布式网络,简化了系统结构;介绍了基于CANopen协议、采用P87C591单片机开发I/O从站的硬件电路、软件设计流程及系统的调试过程;经系统测试和模拟运行表明,I/O从站与监控主机通讯可靠、准确,实时性满足了印刷机控制系统的要求,具有一定的参考价值和广阔的应用前景.     

S7系列PLC电气控制设计与应用 第10讲 EM277的PROFIBUS通讯控制

作为PROFIBUS—DP从站,EM277模块能接受从主站来的多种不同的I/O组态,向主站发送和接收不同数量的数据。本文介绍了EM277的硬件绲态与软件编程。     

C8051F020和SPC3在现场总线分布式控制系统中的应用

针对印刷机外围设备多、分散广、实时性和可靠性要求高等特点,设计了一种基于C8051F020和SPC3的现场总线分布式控制系统。详细介绍了该系统的总体结构、I/O从站的硬件电路、软件设计流程。给出了基于PROFIBUS现场总线的分布式控制系统网络组态与调试的方法。     

PROFIBUS-DP智能从站通信接口的研究和设计

PROFIBUS-DP是一种开放的国际现场总线标准,用于分散外设间的高速数据传输,SPC3是开发DP智能从站通信接口的专用协议芯片.首先概述PROFIBUS-DP总线协议,分析了SPC3的结构和功能,然后应用SPC3实现DP智能从站通信接口的软硬件设计.     

PROFIBUS现场总线FMS协议研究

以开放式系统互联模型ISO/OSI为参考,详细描述了PROFIBUS现场总线报文规范协议的结构,包括物理层的数据传输技术、数据链路层的报文通信格式、应用层的FMS服务以及用户接口中定义的FMS行规。研究了PROFIBUS-FMS的总线配置,在此基础上提出了以协议芯片SPC4为核心,开发FMS智能从站的方法,并就FMS从站的软件流程进行了阐述。     

CANOpen总线与软PLC在MPS中的应用

针对MPS系统I/O多、分散广、实时性和可靠性要求高等特点,设计了一种基于C8051F040的现场总线分布式控制系统。应用C8051F040单片机开发了基于CANopen协议的I/O从站,本文介绍了从站的硬件设计和软件设计。通过上位机CAN卡构建了基于CoDeSys软PLC的分布式I/O控制系统。给出了该系统在MPS中的调试过程。经系统测试和模拟运行表明,I/O从站与监控主机通讯可靠、准确,实时性满足了MPS控制系统的要求,具有一定的参考价值和广阔的应用前景。     

PROFIBUS-DP网络总线用于轿车座椅装配线

本文以分布式I/O控制系统为模型介绍基于PROFIBUS/DP网络通讯的控制系统架构,阐述了PROFIBUS/DP控制系统的软,硬件设计思想及在轿车座椅装配线的具体应用.     

PROFIBUS-DP/RS232智能从站的设计与实现

实现RS232设备和PROFIBUS-DP总线的通讯对于工业控制有着重要的意义。本文介绍了PROFIBUS-DP/RS232智能从站的设计要点,阐述了智能从站在硬件和软件上的实现方法。实践表明:智能从站对主站和RS232接口设备具有数据传输功能,为系统开放互连和现场分布式控制打下基础。     

基于CAN总线的I/O模块设计

提出了一种以CAN总线为基础的过程控制I/O模块的设计方案,介绍了该类型模块的功能、软件、硬件设计方法.用CAN总线实现与通讯模块的数据交换.为保证数据传输的可靠性,在通讯上采用了冗余设计.     

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.