基于CAN总线的电梯群安全性实时检测系统设计

基于CAN总线,以ATB9C51单片机和CAN总线控制器以及CAN总线收发器为主体构成控制模块,实现了电梯安全性实时检测。在此基础上可以通过对数据的分析,实现故障预测并及时处理。     

电梯控制器中CAN通讯的设计与实现

将CAN总线用于电梯控制器中,实现了基于51的CAN与基于ARM的CAN之间的通讯;在BasicCAN模式下,对CAN2.0A协议帧信息进行实际内容规划,并对通讯过程中的一些重要参数进行设置;以MEDWIN为软件平台,采用C51编程,实现电梯控制器中楼层控制板和轿厢扩展板的功能,主板控制器、轿厢控制器以及轿顶控制器采用ADS1.2作为软件平台;各控制器通过CAN总线进行信息的传输;实验证明,CAN总线可以用于电梯控制器的通讯中,性能可靠,实时性好.     

基于现场总线的电梯监控系统设计

基于CAN总线技术,以AT89C51为核心,采用Intel82526及PCA82C250构成的电梯监控系统,通过主控制器与轿厢、门厅控制器间的通信,完成了对电梯的控制,并可进行远程监控。对通讯中出现的冲突采用非破坏性仲裁的方法解决。     

2008年安防精品—深圳达实智能股份有限公司

DAC MJ-M8八门门禁控制器；DAC MJ-k2双门门禁控制器；DAV MJ-M4四门门禁控制器；DAC DT-KZ32路电梯控制器；DAC门禁感应器系列[第一段]     

基于CAN总线的电梯呼梯控制器的设计与实现

本文设计了一种基于CAN总线的电梯呼梯控制器,它是电梯的一个重要组成部分。该控制器用于给出每一楼层的呼叫请求信息,并显示电梯当前运行情况。本系统采用目前比较流行的工业现场总线CAN总线完成呼梯控制器与主控之间的通信,并提出了其软硬件和通信协议的设计方法。     

P87C591内嵌CAN控制器的应用设计

独立的CAN控制器芯片需要外接一个微处理器,接受外部CPU的控制才能运行。如果微处理器内部带有CAN控制器,无疑会大大简化应用系统的硬件设计,系统的可靠性也有很大提高,同时还可以大幅度降低生产成本。Philips的新产品P87C591内部集成了CAN控制器。本文主要介绍如何利用P87C591进行CAN节点的设计和应用。     

基于CAN总线的非接触式IC卡门禁与巡更监察系统

该文介绍了一种基于CAN总线的非接触式IC卡门禁与巡更监察系统方案,重点讨论了节点门禁与巡更控制器的设计,并阐述了系统的特色、主要功能及应用前景。实践表明,CAN总线数据传输性能稳定可靠,使用非接触式IC卡操作安全便捷,因而极大地提高了社区安防管理效能。     

电梯控制系统CAN通信节点设计

针对电梯控制系统对分布式、实时性和模块化的特点要求,设计了以AT91RM9200微处理器为核心、以MCP2510为CAN控制器的CAN通信节点,从硬件和软件两方面详细叙述了如何进行CAN网络节点的设计,并将其成功应用在电梯控制系统中,提高了系统实时响应和抗干扰能力。     

μC/OS-Ⅱ实时操作系统在压力测控系统中的应用

针对工业色谱仪中对管道压力的检测控制要求,设计了压力检测控制器,在该控制器中,采用CAN现场总线,同时使用了Cygnal公司生产的集成有CAN控制器的C8051F041芯片,完成了系统的硬件设计.软件设计使用了μC/OS-Ⅱ嵌入式实时操作系统.编写了底层硬件驱动程序以及上层应用程序,从而完成了整个压力控制器的设计.     

基于CAN/LIN混合网络的电梯通信系统

介绍了一个专门为以PLC为核心控制器的电梯控制系统而设计开发的电梯通信系统。对起源于汽车工业的总线技术CAN总线和LIN总线进行了研究，说明了CAN总线、LIN总线在电梯通信系统中的应用，提出了可靠而低成本的CAN／LIN混和网络体系，并设计了CAN／LIN数据交换的网关．分析其系统构成和通信实现。由CAN／LIN混合网络体系构成的通信系统与用传统通信方式构架的电梯通信系统相比，前者具有低成本、高可靠性的特点。     

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.