野战有线通信系统二线全双工接口测试电路设计

野战有线通信系统全双工接口在单对线上同时收发信号,难以直接进行数据采集和测试。针对上述问题,研究了一种基于收发分离和自适应回波抵消的二线全双工接口测试方法。首先,设计电子收发分离器,实现线路上收发信号的隔离;然后,使用自适应回波抵消器,完成了近端回波干扰信号的抵消;最后,借鉴软件无线电技术和存储测试技术,构建测试系统,实现激励信号生成与数据采集。仿真和实验表明,该测试方法能够实现有效完成收发信号隔离以及回波干扰信号抵消,适用于野战有线通信系统二线全双工接口测试。     

一种基于FPGA的高速图像采集及显示电路设计

为了实现高速图像采集和显示,采用CamLink接口和DVI接口来完成视频采集和显示。详细介绍了基于FPGA采集和显示的系统组成,给出了CamLink接口采样模块和DVI显示模块的工作流程及硬件电路实现方式。该硬件电路基于CPCI总线设计,实现了计算机与图像电路之间的高速数据交换。设计中使用的FPGA是Altera公司的EP2S30F672I4,用该FPGA进行配置和验证,测试表明该设计不仅实现了图像高速采集和显示,且使图像清晰、系统稳定可靠。     

用于纳米通道单分子检测的数据采集系统的设计与实现[BT)]

针对纳米通道单分子检测系统的信号特点和对数据采集的采样精度、采样速率及实时性等要求,设计并实现了基于FPGA和USB2.0接口的数据采集系统;该系统以FPGA作为控制核心,包括数据采集模块、电压输出模块和USB接口电路模块;通过USB2.0接口与计算机连接,实现数据的实时采样和参数的在线配置;此外本系统还采取了低噪声设计;经过相关试验表明,该系统引入的噪声在1 mV内,能够稳定进行数据采集,且采集信号与电压输出信号同步传输,证明该系统能够满足纳米通道单分子检测系统对数据采集的要求.     

群路CPC收发器的硬件实现

在在对循环排列码字（CPC）的特点进行分析之后,以某通信专网的群路接口为例,介绍了一种群路CPC收发器的硬件电路设计方案,给出了CPC译码表的生成算法,着重对电路的模块划分、功能及实现方法、寄存器设计及使用方式进行了详细说明,简要分析了该电路的检测性能。该设计采用现场可编程逻辑器件（FPGA）实现,资源占用较低,具有很好的移植性,简单修改后即可用于类似接口,是一种较为通用的CPC收发电路。     

导弹电动伺服机构控制器电路设计

针对导弹电动伺服机构控制系统中无刷直流电机的三闭环控制需求,提出了一种DSP和FPGA组合设计电动伺服机构控制系统硬件设计方案,其中DSP实现复杂控制算法和实时控制程序,FPGA实现时序控制逻辑。同时还扩展了基于BU-61580总线协议芯片的1553B总线接口电路设计,以满足新型弹上总线式控制系统的接口要求。电机功率驱动电路采用智能功率模块（IPM）设计实现,位置、转速、电流信号检测分别采用绝对值编码器、旋转变压器和霍尔电流传感器设计完成。硬件调试结果表明,所设计的硬件电路工作稳定,达到了预期的设计要求。     

基于FPGA的ARINC429多通道接口设计与实现

针对传统ARINC429接口集成度低、功能单一的局限性,基于FPGA技术,设计并实现了多通道的ARINC429接口电路,有效地提高了数据处理能力和集成度。在航空信号仿真平台中,完成信号的接收和处理、转换和发送,实现了通道的切换和信号的交联。     

基于FPGA的QPSK信号干扰源设计

针对QPSK调制方式特点,设计了基于FPGA的信号干扰源,分析了系统干扰原理;利用m序列生成均匀白噪声,采用地址法完成高斯白噪声转换;以Logistic混沌映射电路作为信源,采用直接数字频率合成技术产生正弦信号作为载波,用VHDL语言设计FPGA与单片机的接口电路;在单片机控制下,用于FPGA生成干扰信号经AD9760实现数模转换;仿真和实验表明,该系统精度高,干扰参数易于控制修改,满足实际要求,并且稍加改动可生成多路同步干扰信号。     

基于FPGA的数字超声内窥镜接收系统设计

根据数字超声成像的要求和超声信号的特点,设计了由高速采样电路和FPGA正交解调电路组成的数字超声内窥镜接收系统。采样电路由AD8138和AD9235实现,对放大后的超声回波信号直接进行模数转换;FPGA利用内部RAM、乘法器、IP核和宏模块构建数字正交解调电路,提取超声回波信号的幅度;获取的幅度信息经USB2.0接口电路送入计算机显示。对玻璃杯进行的静止扫描成像实验,验证了接收系统的小信号检测能力,可以检测到信噪比约为4dB的回波信号;对玻璃杯进行的旋转扫描成像实验,表明接收系统可用于数字超声内窥镜成像。     

基于FPGA的数据采集及显示

在电力系统谐波分析中,模数转换(ADC)电路是影响系统检测性能的主要环节之一。基于NiosII的谐波分析系统具有逻辑控制能力强、信号处理实时性高、系统抗干扰能力强等特点。以Altera公司的DE2开发板为平台,实现了采样电路的硬件设计;在Quartus II中用Verilog HDL语言完成了与FPGA的接口设计,并最终实现VGA显示。     

基于FPGA的遥测系统数据存储器控制模块设计

针对当前遥感系统存储器早期控制模块存在控制效率低的问题,提出了基于FPGA的遥测系统数据存储器控制模块设计。根据模块总体设计方案,设计模块结构和功能。其中模块结构是由自体测试接口模块、低速读写控制模块、高速流读写控制模块组成的,以SATA2.0接口为存储介质设计控制器,构建不同帧,进行数据间传输转换。设计稳态触发接口电路,达到高速流读写控制触发目的。根据软件主流程,在组合逻辑中插入寄存器使逻辑延迟,实现FPGA时序控制。采用分时操作方法,对命令层中控制器读写模式进行控制,实现传输层完成帧的控制收发。由实验结果可知,该模块最高控制效率优于传统模块,为数据高效存储提供支持。     

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.