基于低压电力线载波的测控系统设计设想

本文描述了基于低压电力线载波的,以工厂生产实际要求为背景的设备和生产环境的测控系统的设计设想。前部分简要介绍了电力线载波及其特点和优点,对选择基于电力线载波进行通信作一定的说明。最后指出了现有设想的一些问题。     

电力线扩频载波技术在抄表中的应用

简述了居民抄表中电力线扩频载波技术的原理及其在抄表中的应用,接着介绍一下目前普遍采用的几种电力线扩频载波技术及其代表产品,最后大胆设想了未来居民抄表系统———基于互联网的远程监控系统模式。     

一种基于电力载波的家庭网络与以太网的连接方法

提出了一种将以太网嫁接到电力线上，实现基于电力载波的家庭网络与以太网连接的构思。介绍了实现这种构思的电力线载波以太网方案，采用8位单片机W78E58控制PCI总线网卡接收以太网命令并通过电力载波将其转发到家庭电力线网络中，从而达到远程控制家庭网络设备的目的，为家庭网络的实现提供了新的思路和实现手段。     

基于单片机的窄带电力线载波通信模块设计

设计了基于通用单片机的电力线载波通信模块。首先给出了载波模块的总体设计，其次进行了详细的软硬件设计，最后进行了模块测试。载波模块采用瑞萨高性能单片机R5F100BE、UTC的解调芯片MC3361BPL及外围电子元器件，设计了过零检测电路、载波耦合电路、载波发送放大电路、载波解调电路，形成了先进的低成本电力线载波模块硬件。软件采用了BFSK调制、直接扩频技术，设计了单芯片三信道通信软件流程，在有限的计算资源下实现了三信道通信互不影响，并给出了发送与接收模块程序设计、DFT解码算法设计，实现了高灵敏度的421±15 kHz频率的电力线载波通信。该设计具有实现成本低、研发投入小等优势，在电力线物联网领域具有一定的实用价值。     

一种海洋传感器的电力线载波数据采集传输系统

针对电力线载波技术在数据传输中的应用,研究并改进了现有的基于220VAC电力线载波技术,实现了一种基于500VAC电力线载波模块,设计了基于500VAC船载数据采集传输系统,以获取海洋船载5路阻性负载的电压电流值和15路液压值,同时设计500VAC输出可控电路,以降低水下模块功耗。系统以STM32F107处理器为核心,以改进的500VAC电力线载波模块为数据收发模块,在应用上实现了船载数据采集、传输和误码率的测试。经测试,能可靠地将数据传输到上位机,满足了设计要求。     

高频通道特性探讨

讨论了电力线载波设备与高频通道配合时需注意的事项，通过计算推导出来电力载波设备在接入通道或负载两种状态下电平差值的计算公式，并提出了在电力线载波设备接入高频通道时需注意的问题，为实际工程中电力线载波使用提供帮助。     

基于电力线载波传输技术的井下有毒气体监测系统的设计

针对现有便携式检测设备在监测井下有毒气体过程中存在使用不便、效率低等问题,提出了一种基于电力线载波传输技术的井下有毒气体监测系统的设计方案,介绍了系统的组成、主要电路的设计等。该系统通过使用电力线载波芯片LME2200C、电力线载波传输技术,实现了井下有毒气体的远距离实时监测,有效保证了工作人员的人身安全,提高了工作效率。     

基于电力线通信的智能语音通信模块设计

介绍了基于电力线载波通信的室内智能语音通信模块的设计思路和过程。以电力线载波收发模块为核心,采用AT89S52微控制器作为语音播放的控制单元,设计了电力线载波收发电路,语音录放电路和液晶显示电路。详细阐述了智能语音模块的硬件设计和软件设计。首端发送的数据可以在终端上通过12864液晶显示出来。     

基于电力载波的智能校园节电系统研究

介绍一种基于51单片机的电力线载波技术的校园节电控制系统的工作原理和结构。直序扩频半双工异步调制解调器PL2102载波芯片,通过电力线载波应用系统实现教室电灯的管理和控制,给出用PL2102对电灯进行控制的基本原理、软硬件实现方法及其设计原理图。     

基于电力线数字家庭实现方案

分析了电力载波数据通信的特点,介绍了几种典型的电力载波芯片,提出了一个基于电力线的数字家庭实现方案。     

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.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

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.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

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.     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.