基于以太网互联接口的新型停车场系统设计

针对目前大部分停车场系统还停留在RS485小范围内组网的问题,提出一种以AT89C52单片机和以太网控制芯片ENC28J60为控制核心的以太网/RS485互联新方案;该方案采用C/S通信模式,以AT89C52为控制网关,通过ENC28J60接人以太网,实现对停车场系统的远程监控和数据共享.详细阐述了以太网/RS485转换接口电路的硬件设计和软件设计;该方案无需改变现有硬件电路.通过在停车场系统中的实际应用,验证了该方案设计合理、成本低及可靠性高的优点.     

基于VxWorks的远程数据采集和控制系统分析与设计

本文在介绍了基于ARM内核处理器的VxWorks实时操作系统的基础上，设计了具有CAN总线接口、以太网接口、RS485接口的高性能远程数据采集和控制系统。并说明了系统的原理以及主要部分的软、硬件设计。     

基于RS485总线的网络控制通讯软件设计及应用

该文在分析RS485通讯模式的基础上,提出一种适用于RS485总线的通讯组态技术,在此基础上开发的通讯接口软件能同时与各种具有RS485接口的硬件设备通讯,为实现低成本的网络控制系统提供基础。文章给出了工业应用实例。     

嵌入式复合型工业总线网关的CAN口设计

本文提出了一种基于VxWorks嵌入式操作系统的工业总线协议转换器-TC700.它能够实现RS232/RS485/CAN与以太网的协议转换,是一种复合型的多协议转换网关.在对TCT00功能原理简单说明的基础上,笔者着重从TCT00的硬件电路结构设计和软件驱动程序开发两个方面,具体分析介绍了该网关CAN接口驱动设计的过程.通过移植UNIX系统下u-boot中的spi.c程序,完成了CAN接口驱动程序的设计内容.     

基于LM3S8962的RS485-Ethernet协议转换器的设计

为了实现RS485总线和以太网互联,在不改变原有网络结构的情况下,将RS485总线控制系统改造为以太网分布式控制系统,设计了一种低成本的基于ARM Cortex-143体系架构LM358962微控制器的RS485-以太网协议转换器.LM3S8962通过其内部集成的以太网控制器和UART控制器分别和两种网络中的设备进行通信.经验证,设计的转换器可实现RS485和以太网两个网络的透明通信,实现远距离,快速,可靠的数据传输.     

基于Windows XP的RS485网络监控系统

在分析RS485接口特性的基础上,设计出基于RS485接口的网络监控系统的硬件电路,并对系统的工作原理进行了详细分析.讨论了在Windows XP环境下实现9位串行通讯的方法,使用VC 6.0和Windows通信控件设计了串口网络监控软件.     

基于单片机的以太网与RS485通信网关的设计

文章介绍了一种基于单片机的以太网与RS485通信网关的设计与实现方法,分析了以太网与RS485网络的特点,给出了该网关的硬件设计方案及软件流程。与一般的嵌入式网关相比,该网关具有结构简单、通用性强、易于开发维护等特点。     

基于LPC2378的嵌入式多协议网关设计

网关以ARM7处理器LPC2378为核心,结合多种通信接口芯片,实现了RS232、RS485、CAN总线和以太网的互连通信。从软硬件两方面介绍了网关的设计,硬件部分包括各通信模块的接口电路设计,软件部分介绍了模块数据协议转换的实现。该网关很好地解决了工控网络设备层和信息层的衔接问题,具有良好的实用性和应用前景。     

远程数据采集系统实现方法

在介绍USB接口和RS485接口的基础上,分析了USB、RS485和AT89C52各自的特点提出一种旨在综合AT89C52、USB接口、RS485接口3方面优点的远程数据采集系统设计方案,并从硬件、软件结构两方面详细阐述了实现方法.最后指出该远程数据采集系统具有较强远程传送能力和使用方便、支持热插热拔、价格低廉、功能较强等优点,可用来实现分布式检测控制系统,具有广阔的应用前景.     

基于AT89C52单片机的RS485-CAN智能转换器设计

基于CAN总线和RS485总线的广泛应用和各自的优缺点,设计了基于AT89C52单片机的RS485-CAN智能转换器。在保留现有RS485系统硬件的基础上添加了一个CAN总线接口,实现了CAN总线与RS485之间的数据传输,具有一定的使用价值。     

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     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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。