摘要：介绍自行开发的电力线载波自动抄表系统。该系统采用电力线传输数据 ,系统微机与单片机相配合 ,能够完成电表数据的全自动传输与系统维护 ,可通过电话网、双绞线以及电网构成一个庞大的可靠的通信网络。该系统的上位机以VisualFoxPro为开发平台 ,标准的接口与界面设计 ,使系统的维护简单易行 ;下位机采用 89C2 0 51完成底层通信协议的开发。整个系统组网便捷 ,施工方便。

摘要：介绍一种基于DTMF编码的电力线载波系统 ,该系统由双音频 (DTMF)编译码芯片HT92 0 0和MT8870、模拟乘法器MC1 4 96和电力线耦合器组成。通过对系统组成原理的介绍 ,详细论述了系统的设计过程以及为了保证其通信的可靠性而采取的抗干扰和软件纠错措施。试验证明 ,该系统充分发挥了DTMF的优良性 。

摘要：设计了以PL3201为核心的载波通信功能模块,针对该芯片提出一种符合我国低压电力线载波信道传输特性的通信调制方法,采用QPSK调制等技术自制了一个低压电力线载波通信系统,其抗衰减和抗干扰的性能具有较大的优势,实验结果表明利用220V低压电力线进行数字信号的传输是切实可行的。

摘要：火车货运在高速发展的同时,也带来了越来越多的不安全因素,货运物资被盗是铁路货运事故的主要原因之一。基于此,设计和实现了基于Zig Bee和Win CE技术的火车货运防盗预警系统,用于解决站停、待编、待卸和运行途中的施封车(棚车)运输物资被盗等问题。测试和实验结果表明,该系统监测准确、稳定,提高了打击盗窃犯罪的效率,有效维护了货主的财产安全和铁路货运声誉。

摘要：设计了一款术后康复理疗仪,以生物安全型高频信号源为理疗信号,在深层进行电能与生物热能的转换。该理疗仪由电极、高频生物安全型信号源、嵌入式微控制器和电源组成。采用WinCE操作系统,应用分级式脉宽控制算法对信号频率与强度进行智能控制。测试表明,该理疗仪电磁兼容性好,安全性高,理疗效果明显。

摘要：本文针对我国工科院校留学生的"单片机"课程教学情况,分析了全英文教学的特点以及传统教学的弊端。本教学团队根据多年的实践,通过引入项目式教学理念,对我校留学生的"单片机"课程,设计了全新的项目式教学模式。文中阐明了该教学模式的项目内容、教学方法以及实施过程。实践证明,项目式教学模式能够有效促进留学生对知识的理解与掌握。

摘要：For the issue of nuclear radiation detection,this paper designs a remote control nuclear radiation detector which can trace a pre-determined route,avoid obstacles effectively,and can be controlled remotely by users wirelessly or through voice *** can effectively replace manual probing due to convenience,flexibility and *** system mainly consists of a nuclear detection module,a voice control module,a route tracing module,an obstacle avoidance module,a data transmission module,storage and a display module,and a *** MSP430 microcontroller is used as a control chip to control the motor and the system uses infrared technology and ultrasonic sensors to achieve intelligent tracing and obstacle ***,it applies a voice module and data transmission module to remotely controlling the *** radiation data is shown on an LCD screen.

摘要：A large class of multimedia and biomedical signals can be modeled as Autotegessive （AR） random processes. Pefformance of watermarking embedding algorithms utilizing this host model is still left unexplored. The authors investigate the decoding perform-nance of Spread Spectrum （SS） embedding algorithm in the standard Additive White Gaussian Noise （AWGN） channel with the host signal being modeled as AR process. The SS embedding algorithm also use linear interference cancelation in the subspace spanned by watermark pattern. They study the influence of design parameters on the decoding performance. The analytic result is verified by Monte Carlo simulation on synthesized AR process. The result may be helpful to design watermarking system for speech, biomedical and image signals.

摘要：The paper puts forward a kind of online shopping system based on ASP. NET technology, including the establishment of data- base anti the design of the front web pages. The system uses Microsoft ASP. NEF as development platform, C as the server language, and Microsoft Visual Studio 2008 as the development tool. ADO. NET is used to connect with SQL SERVER 2000 database through the data- base controls. A variety of server controls are used to create the ASP. NET page to implonent the syste^n functions. The syston is designed in 3-Layer application which includes Presentation Layer （PL）, Busi- ness Logic Layer （BLL） and Data Access Layer （DAL）. The operation of the database is in DAL, the logic fimction is in BLL. So the amotunt of work in the development, the difficulty of system maintenance and the upgrading can be reduced. After being tested, the system meets the requirement of the users.