基于ZigBee技术的电子标签识别系统设计

针对传统射频识别技术存在传输距离短、灵活性差和设备成本高等问题,设计了一种基于ZigBee技术的电子标签识别系统。系统以TI公司的CC2530和Nordic公司的nRF24LE1分别作为无线通信节点的收发芯片和读写器的射频芯片,通过星型网络实现电子标签信息的采集和传输,给出了ZigBee终端节点和协调器节点的软硬件设计。在室内外环境下对该系统进行现场测试表明:电子标签信号发射距离为25~65m,ZigBee无线模块在200m范围内实现有效传输。     

无线传感器网络的T5743芯片接收节点设计

无线传感器网络节点是一个微型嵌入式系统,有采集、发送、接收数据等功能,本文以无线通信技术为基础设计网络接收节点,采用RF射频接收芯片T5743的网络接收节点,达到了网络节点数据的短距离接收,并降低接收数据的误码率,实现传感器数据无线通信。     

基于CC2420的无线传感器网络的硬件节点设计

传感器节点是组成无线传感器网络的基本单位。本文通过对传感器硬件节点的研究,选择射频芯片CC2420为核心,设计了CC2420与ATmega128单片机的硬件接口和无线通信的软件流程,提供了一种基于CC2420的无线传感器网络的硬件节点设计方案。     

基于射频芯片CC2420 ZigBee无线通信节点设计

无线传感器网络集成了传感、无线通信、嵌入式计算、微机电系统(Micro-Electro-Mechanism System,简称MEMS)以及微电子(如SOC)等各项技术,在国防军事、环境科学以及智能家居等领域有着广泛的应用,由于其通常运行在人不能或不便接近的环境,能源无法替代,因此,设计合理的网络节点成为无线传感器网络的核心问题.文中提出了以射频芯片CC2420为核心,配合微处理器的ZigBee无线通信节点设计方案,论述了系统的构成和工作原理,对系统硬件电路和软件设计作了说明.     

基于CC2420的无线传感器网络的硬件节点设计

传感器节点是组成无线传感器网络的基本单位。本文通过对传感器硬件节点的研究，选择射频芯片CC2420为核心．设计了CC2420与ATmega128单片机的硬件接口和无线通信的软件流程，提供了一种基于CC2420的无线传感器网络的硬件节点设计方案。     

无线通信系统在岩土桩基检测中的应用

论文根据静载仪在岩土桩基检测中的工作现状,结合无线通信系统设计原则,提出以CC1100(433MHz无线射频芯片)和低功耗单片机PIC18LF4620为核心组成无线通信系统.通过对主节点、子节点的硬件电路设计,按照约定好的协议实现数据采集、过程控制和数据处理,实现了无线通信系统在一个主节点和六个子节点之间星形组网的数据传输.     

集成应变传感器的无源超高频标签电路设计

针对现有有线有源应变传感器不适用于固体火箭发动机壳体应变监测的问题,基于UHF RFID(超高频无线射频识别)技术,设计了一款无源超高频应变传感标签.标签通过电磁反向散射方式,收集超高频射频能量为电路供能,同时在标签电路中加入了大容值储能电容,储存经RFID芯片中的倍压整流电路转换成的直流能量.将标签电路分为UHF标签模块、控制模块和应变传感器模块3个部分进行了设计,并通过使用低功耗芯片以及控制测量电路的断开和闭合来减小功耗.标签将传统的电阻式应变测量技术与UHF RFID技术结合在一起,为实现固体火箭发动机壳体应变的无线监测提供了解决方案.     

UHF频段无源RFID读写器系统总体方案设计

射频识别技术 RFID技术是利用无线射频方式进行非接触双向通信,自动识别目标对象并获取相关信息数据的无线通信技术。它可实现对运动目标的快速识别和多目标识别,识别的距离可达几十厘米至几十米;根据读写的方式,     

一种异网组合的远程无线控制系统

以单片机STC12C5A60S2和单片无线通信模块WISMO228、无线射频收发器nRF24L01为基础,采用远程无线通信和近距离无线局域网相结合的方法,设计并实现远程无线控制系统.系统使用手机进行远程控制,局域控制网络节点采用电源插头方式,可以“即插即用”、随意组合,应用领域较宽,性价比较高.     

基于射频芯片CC2420的ZigBee无线通信节点设计

无线传感器网络集成了传感、无线通信、嵌人式计算、微机电系统（Micro—Electro—Mechanism System．简称MEMS）以及微电子（如SOC）等各项技术，在国防军事、环境科学以及智能家居等领域有着广泛的应用，由于其通常运行在人不能或不便接近的环境，能源无法替代，因此，设计合理的网络节点成为无线传感器网络的核心问题。文中提出了以射频芯片CC2420为核心，配合微处理器的ZigBee无线通信节点设计方案，论述了系统的构成和工作原理，对系统硬件电路和软件设计作了说明。     

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.