基于井下涡轮电机的导向钻井工具下传指令接收软件设计

设计了指令接收软件,使井下导向工具检测与识别下传控制指令,完成井下指令信息的接收,实现下行通讯;下行通讯选用钻井液脉冲法传递信息,采甩泥浆脉冲的三降三升传送控制指令代码,在井下采用涡轮电机作为信息的接收装置;指令接收软件所作的数据处理有:对电机输出电压的阈值进行判断,对泥浆传输中的各种干扰进行剔除,对内部脉冲进行计数以实现脉宽计时,并对脉宽计时值进行处理以最终得到控制指令字;当接收的电压脉冲信号的脉宽为T、T、T、T、2T时,解释得到的控制指令代码为11112;实验证明,应用此指令接收软件能正确地为井下工具接收地面监控命令,解决从地面向井下的数据传输问题.     

基于MSP430单片机的篮球计时计分器的设计

本文介绍了一种基于MSP430单片机的篮球计时计分器的设计,计时计分器以MSP430F135单片机为控制核心、采用12864点阵液晶作为显示单元、通过独立式按键进行按键操作,并具有语音播报功能。计时计分器具有设置功能,精确的计时功能,完善的计分功能,并可通过语音播报比赛相关信息,也可连接外置功放以提高语音播报的音量和清晰度。本设计基本实现了篮球比赛过程中所需的大部分功能,设计成本低廉,实用性强,能够应用于小型篮球比赛。     

一种Web集群系统的动态分离式调度策略

静态分离式调度策略（SSSP）不能有效地分配服务器资源。动态分离式调度策略（DSSP）对静态请求和动态请求分别以请求的文件和用户会话为单元进行调度。请求分发器监测后端服务器的状态,按资源使用情况将服务器区分为轻载、重载和过载,轻载服务器可以接收新的请求单元,重载服务器不接收新请求单元,但继续为已接收的请求单元服务,过载服务器迁移部分请求单元到轻载服务器。试验结果表明,DSSP的效率明显优于SSSP。     

车辆纵向安全距离算法及其防撞预警系统研究

为了降低交通碰撞事故,在分析车辆制动历程基础上提出了一种新的车辆纵向安全距离算法,并将安全距离分为提醒安全距离与警戒安全距离;以LPC2214单片机为核心设计了基于激光测距的防撞预警系统,采用TDC-GP2芯片作为激光飞行计时单元,给出了激光发射及回波接收放大电路,最后介绍了系统软件设计流程;在自己车速为100km/h,前方车速为0km/h与80km/h时,采用Matlab软件分别对制动历程进行仿真验证,结果符合停车要求,其算法准确、可靠,具有较强的实际应用价值;通过实验测试,系统能很好测出前方车辆距离及运行状态,及时发出报警。     

基于SPCE061A单片机的超声波测距系统的设计

利用超声波的特点,设计一套超声波测距系统。该系统以凌阳单片机SPCE061A为主控芯片,设计单片机控制超声波的发射和接收、定时器的计时等模块。该系统具有操作简单、成本低廉、测量精度高等特点,具有广泛的应用前景。     

基于VHDL的数字秒表系统的设计与实现

如今数字秒表是日常生活中比较常见的电子产品,常用于体育比赛和时间计时,计时的精准性和稳定性是衡量数字秒表最重要的两个指标。现在市场上的数字秒表基本上都能满足计时准确的要求,但很少能满足计时稳定性的要求。针对市场的需求,本文设计了一种用于精确计时且计时稳定性高的数字秒表,该设计是在Quartus Ⅱ环境下,基于FPGA芯片,利用VHDL语言来编译的,具有开关、计时和显示功能,其计时精度较高,计时范围较大,计时稳定性好。该设计具有很强的实用性,有着非常广泛的应用。     

Windows控制系统的精确计时机制研究及应用

如何做到准确计时是控制软件中非常重要的任务，而在Windows系统却没有提供高精度的定时／计时函数。分析了Windows系统的计时原理，提出了一种新的计时方法，可以满足控制软件对定时／计时的高精度要求。     

分布式实时系统请求接收单元优先级的研究

基于固定优先级调度的分布式实时系统中,服务方对请求的处理分为两个阶段,请求接收阶段和请求执行阶段。其中请求的接收一般是由接收单元统一负责,而接收单元并不知道请求的优先级,只有在解码后才能知道请求的优先级并按照优先级进行相应的处理。那么接收单元本身的优先级如何确定呢?该文针对这一问题进行了深入的研究。在对系统进行建模并取得模拟结果后得出了重要结论,在基于固定优先级调度的分布式实时系统中,服务方接收单元的优先级要小于最高优先级,大于其他优先级。     

基于PIC单片机的找水系统设计

通过分析时间域电磁法（ TEM）探测原理,简化了磁感应线圈设计,设计了以PIC单片机作为控制核心,集成了信号发生单元、接收处理单元和数据传输单元的检测系统,开展了现场测试。测试结果表明：该系统可有效实现对套管外部地层信息的探测,准确区分油水界面,有效径向探测距离可以达到0.8 m,具有控制便捷、探测距离远、性能可靠、集成度高以及功耗低的特点,为套后油层水淹监测提供了新方法。     

基于单片机及Delphi的红外遥控编码分析

以单片机AT89C2051及一体化红外接收头为主要部件构建红外编码信号接收器,利用单片机的外部中断和定时器的计时功能,通过中断程序获取遥控信号波形的宽度数据.在上位机中用Delphi编写程序,接收串口数据、计算并显示脉冲宽度、识别遥控编码、绘制波形图.     

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。     

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.     

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     

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.