CAN总线的PCI接口通信卡设计

介绍了CAN总线的PCI接口通信卡的硬件电路和通信主控程序的设计以及驱动程序的开发,利用PCI接口芯片和双口RAM以及微控制器实现工业现场总线CAN总线节点与工控机之间的通信,设备驱动程序在实时嵌入式操作系统Vxworks下开发。     

基于CAN总线的并联逆变电源通信监控系统研究

在分析TMS320C2000系列芯片中内嵌CAN控制器特点的基础上,设计了一种基于LF2407A内置CAN总线模块的逆变电源并联系统,实现了对并联逆变器模块运行的实时通信监控。给出了CAN总线接口硬件设计、通信监控软件功能及工作过程。     

S3C44B0X芯片的CAN总线接口设计

随着CAN现场总线应用领域的不断扩展,在布线复杂,电磁干扰强,实时通信能力要求高的环境下需要高性能的数据处理结点.S3C44B0X芯片有低功耗、低成本、高性能的特点,但不具有CAN总线接口功能,限制了在其CAN现场总线领域的应用.本文在研究CAN2.0协议的基础上,采用MCP2510总线控制器扩展S3C44B0X芯片的CAN总线接口功能,实现CAN总线数据的发送与接收.该设计可应用于ARM7架构的芯片,构成CAN结点.     

基于CAN总线的电动汽车能源管理系统

为保证电动汽车电子控制系统间通信的实时性、可靠性和互操作性,提出基于CAN总线的电动汽车能源管理系统;以AT89C52芯片为核心构建了能源管理系统的基本结构框架和总体功能方案;设计了CAN总线多功能集中器及其相应程序,使能源管理系统可以通过CAN/USB转接口和上位机(PC)通信,也可通过CAN总线与运动控制器相互传输数据,实现数据信息共享,并可动态显示能源节点状态;电池电压监控实验验证了能源管理系统的有效性和可行性,FUDS工况和整车实验验证了其稳定性和可靠性.     

PCI总线CAN通信适配卡设计及其与组态软件数据交换的方法研究

针对CAN总线技术在硬件设备接口、组态软件等方面的工程应用现状,研究和实现了一种实用的完整解决方案.本方案在CAN通信适配卡中,使用更先进的PCI总线接口取代传统的ISA总线接口,编制了即插即用的驱动程序,并且通过DDE程序,实现与工控组态软件KingView的实时数据交换.     

基于ARM芯片的CAN总线接口设计与实现

为了使S3C2410X芯片可以控制CAN总线数据的发送与接收,采用MCP2510总线控制器扩展S3C2410X芯片的CAN总线接口功能,系统硬件主体采用MATRIXVARM9板和MCP2510总线控制器,操作系统采用ARM-Linux,详细介绍了硬件的接口设计,讨论了嵌入式ARM-Linux操作系统上CAN设备驱动程序的具体设计方法.经过测试,可以满足应用的要求.     

Windows CE的CAN总线驱动程序设计

介绍一种基于S3C2410的Windows CE扩展CAN总线接口的方法.利用SPI接口扩展CAN总线接口,编写CAN流接口驱动程序;给出硬件接口设计原理图,重点阐述WinCE下独立CAN控制器MCP2510的驱动程序的实现,并给出软件处理流程.     

S3C44BOX芯片的CAN总线接口设计

随着CAN现场总线应用领域的不断扩展，在布线复杂，电磁干扰强，实时通信能力要求高的环境下需要高性能的数据处理结点。S3C44BOX芯片有低功耗、低成本、高性能的特点，但不具有CAN总线接口功能，限制了在其CAN现场总线领域的应用。本文在研究CAN2．0协议的基础上，采用MCP2510总线控制器扩展S3C44BOX芯片的CAN总线接口功能，实现CAN总线数据的发送与接收。该设计可应用于ARM7架构的芯片，构成CAN结点。     

用嵌入式系统实现复杂交互通信

设计嵌入式系统实现各种通信方式之间的数据交互.核心模块板采用基于ARM9体系结构的微控制器.硬件电路扩展外围串口、CAN总线接口、以太网口等.为嵌入式Linux操作系统开发扩展的串口驱动程序;应用编程完成多线程建立、缓冲区互斥、串口收发等功能函数.实现了CAN总线、以太网及串口之间的数据交互.经测试,设计并实现的通信控制器满足复杂交互通信的要求.     

基于CAN总线和VB的环境参数监测系统设计

介绍了基于STC12C5A60S2单片机、SJA1000型CAN接口控制器以及PCA82C250串行收发器构成的总线通信网络。该网络中远端的CAN节点可监测现场环境,并实现数据收发和串行通信,上位PC机利用VB6.0设计的监测界面可实时显示现场CAN节点的环境参数。文中重点分析了CAN总线节点和组网技术,给出了系统的硬件电路设计和软件处理流程。实验结果表明,该系统具有数据传输可靠、通信距离远以及实时显示功能,而且抗干扰能力强。     

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.