便携式现场音频信号检测仪设计

介绍了系统信号调理电路和以DSP及模数转换器ADS7805为核心的信号采样电路,结合快速傅里叶变换介绍了系统参数测量的主程序及服务子程序,最后对系统应用中的测量精度进行了分析。实验表明该仪器测量电压精度达0.5级,频率分辨率达20Hz。     

激光位移传感器数据采集技术

本文介绍了激光位移传感器的性能,以及由ADS7805和单片机构成的数据采集传输设备.该系统能够检测80±15mm范围的位移量,分辨率3μm,检测精度±15μm,工作带宽2kHZ以上,可适用于多种非接触测量领域.     

基于ADS7812的数据采集系统设计

现代信息采集系统中A/D转换是关键,本文介绍了利用ADS7812进行A/D转换的数据采集系统。文中对ADS7812的特性进行了分析,给出了ADS7812与51单片机接口的程序代码,最后提出应用ADS7812应注意的一些问题。     

基于ADS8364的多通道高速数据采集处理系统

提出了一种基于ADS8364的多通道同步实时数据采集处理系统的设计与实现方案,给出了硬件接口电路及部分关键的程序.该设计以ADS8364与TMS320LF2407A-40为核心器件,具有6个独立的A/D通道,能实现16位数据采集.将该系统应用到语音实时处理中,结果表明,该系统能够满足实时语音处理要求,效果较好.     

直流稳压电源及漏电保护装置设计与研究

本项目设计的一款线性直流稳压电源,带有漏电保护装置。特点是输出电压比输入电压低;反应速度快,输出纹波较小;工作产生的噪声低。这款电源可以接入5.5-25V电压,额定输出电压5V,额定输出电流1A,能在液晶屏上实时显示稳压电源的输出功率值,并装有漏电保护装置。系统电源部分采用芯片K7805-2000实现输出5V电压,但K7805-2000芯片需要的输入电压是7-18V,所以在该电路前加一个升压电路,采用芯片LM2577T-15进行升压,达到15V电压供给芯片K7805-2000。     

ADS8344和FPGA的高精度数据采集前端

ADS8344是TI公司生产的8通道、16位、高精度、低功耗A/D转换芯片.本文介绍了ADS8344的主要特点,并给出以其和FPGA为基础的数据采集系统,以及硬件电路和相应的硬件描述语言设计方法.     

基于ADS8364与USB接口的高速数据采集系统

本文介绍了高速数据采集系统的设计,该设计根据高速A/D转换器ADS8364的时序,采用FPGA硬件直接控制高速A/D转换器的数据转换和输出,并在单片机AT89S52的控制下,将转换数据通过专用USB接口模块PDIUSBD12,传送给上位PC机,文中详细叙述了ADS8364和USB接口模块的运用模式和具体硬件连接方式,介绍了系统的信号流程,以及主要软件模块设计。     

基于MSP430的智能冲击电流计的设计与开发

该文设计与开发了一套智能冲击电流计系统,该系统采用MSP430单片机为主控芯片,ADS7886为A/D芯片。该系统不仅具有传统数字冲击电流计的功能,还配有基于继电器的智能开关电路。经实验测试,该系统能精确测量高电阻。     

基于MSP430的智能冲击电流计的设计与开发

该文设计与开发了一套智能冲击电流计系统,该系统采用MSP430单片机为主控芯片,ADS7886为A/D芯片。该系统不仅具有传统数字冲击电流计的功能,还配有基于继电器的智能开关电路。经实验测试,该系统能精确测量高电阻。     

ADS8325与FPGA在熔盐堆保护系统中的应用

针对战略性先导科技专项(TMSR)熔盐堆保护系统中,对接收到的信号需要有较高的数据转换精度,并且保护系统中的元器件具有一定的抗辐射能力的目的;文章采用了16位串行微功耗、高速、高精度ADS8325芯片和ACTEL公司开发基于Flash技术的具有抗辐射性能的现场可编程门阵列FPGA,设计了熔盐堆保护系统中关键的A/D转换和定值比较单元;整个设计方案用Verilog HDL硬件描述语言实现,并在Libero平台下进行软件编程实现A/D转换的工作时序和定值比较的控制;测试结果表明,ADS8325对快速变化的输入信号反映灵敏、准确稳定、可靠,达到熔盐堆保护系统A/D转换和定值比较的要求。     

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.     

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.     

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.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。