基于CAN总线分布式安全检测系统设计

为了防止工业生产中由于误操作或误进入而引起事故的发生,从而保证人员安全和生产的正常进行.本系统利用红外传感器光电转换特性,以AT89C51单片机作为核心控制单元对检测信号进行处理,同时控制CAN总线控制器/接收器构成的CAN总线通信系统进行数据传输状态显示,完成了分布式安全保护检测控制系统设计.本设计基于红外传感技术、单片机技术、EDA技术、CAN总线技术实现了生产现场安全防护检测控制.文章介绍了系统部分模块电路原理.     

基于DSP的分析仪器CAN网络通信系统

本文提出了一种构建用于智能化分析仪器的CAN总线网络的方法,设计了满足要求的通信程序,用来解决在工业生产中遇到的现场检测信息的采集、处理和同步等问题.根据项目的设计要求,介绍了基于DSP的分析仪器的构成,给出了CAN总线网络的基本构成,标准标识符的分配以及通信程序的流程.本设计在试验中取得了良好的效果.构建此网络对实现流程工业中多组分参数的实时检测,进一步实现直接质量控制有着积极意义.     

Linux系统下CAN总线通信的设计及实现

本设计为光电稳定跟踪平台开发CAN驱动,以实现CAN总线上设备问的通信.分析了linux下标准设备驱动机制和CAN总线通信模型,给出了光电稳定跟踪平台中CAN总线通信的硬件设计,实现了带SPI接口的CAN控制器MCP2510的驱动.     

过程分析仪器中CAN通信网络的构建

一种构建过程分析仪器CAN总线网络的方法被提出,用来解决在工业生产中遇到的现场检测信息的采集、处理和同步等问题。根据项目的设计要求,分析了在分析仪器间构建CAN网络的必要性和可行性,实现了基于组合式分析仪器的CAN网络,并制定了适用的CAN应用层协议。分析仪器的网络化能够满足多组分分析仪器在分析周期、仪器成本等方面的要求,实现多个分析仪器之间信息的传输和多路待测气体在多台分析仪器中的信号同步,减少分析仪器对DCS端口的占用。     

CAN总线在地面爬行机器人中的应用

基于CAN总线实现了地面爬行机器人的通信网络.简要介绍了CAN总线的特点,提出了利用CAN总线构建地面爬行机器人的通信网络,并加以实现.提出了两种方案实现CAN的应用层协议,并对每种方案进行了性能分析.设计的针对性实验验证了本系统的可靠性和稳定性,结果表明基于CAN总线的通信网络满足了在地面爬行机器人中的应用.     

基于CAN总线的检测网络设计

本给出了一种基于CAN总线的检测网络应用层协议的设计思想和具体实现方法：根据CAN总线的报特点提出了检测网络的通信协议,介绍了检测节点和显示节点的功能及其网络通信方案。     

CAN节点通讯及处理的强度测试设计

随着现场总线技术的发展,CAN总线作为典型的现场总线之一,已得到广泛应用.针对CAN节点安全性、可靠性验证要求之一强度测试,给出了一个设计和实现,此设计的核心是一个具有USB2.O接口的双通道CAN总线实时数据转发器.通过高性能的MCU实现了实时CAN数据的收发,以及与主机之间的实时数据交换,用以检测被测CAN节点的数据收发和处理性能及设计余量,该转发器可以实现CAN连续帧的收发,帧间隙可以控制在几十微秒内.通过与主机测试软件协同工作,可对CAN节点进行强度和性能测试.另外若配置主机分析软件,也可以作为CAN双总线的协议分析仪,并且采用USB接口供电设计使用携带方便.     

基于CAN/LIN总线的车载通信网络设计

随着汽车上的电控系统数量越来越多,各系统之间大量的数据通信会产生诸如电路复杂、线束增加、可靠性下降等问题.本设计提出了一种基于CAN/LIN总线的车载通信网络的低成本解决方案,其中将CAN总线网络应用在高速驱动系统,LIN总线网络应用在低速的车身控制系统,两者通过网关进行数据交换.经过测试,本车载通信网络设计合理,通信可靠,能够实现CAN/LIN数据的透明传输.     

数据采集系统中CAN通信的设计与实现

CAN总线由于其优良的特性得到了广泛地应用,对于内部没有集成CAN控制器的处理器可通过扩展外部CAN接口来实现与CAN的通讯.本文以Philips处理器AT89C51和CAN控制器SJA1000为例,给出了数据采集系统的CAN系统的硬件设计和CAN通讯的实现.     

基于CAN总线的自动售货机测试系统

为解决自动售货机产业化后生产检测效率问题,本课题设计了一套基于CAN通信的自动售货机自动测试系统,在提高产品检测效率和准确率的同时,将检测结果通过以太网发送到远程计算机进行分析处理,实现了生产WEB管理,经过生产实践证明可有效提高产品检测效率。     

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.