应急电源正弦逆变器DSP控制的研究

介绍SPWM逆变器的工作原理及软、硬件的实现,叙述了搭建驱动电路,产生SPWM波,在A/D端口进行采样和实现PI控制的算法的全过程.实验验证了采用DSP实现对逆变器的控制是可行的.     

一种多通道同步数据采集预处理电路的设计与仿真

提出了一种多通道同步数据采集预处理电路的设计方案。该方案采用简单可靠的硬件高速锁相环电路控制多通道A/D转换器,保证了同步整周期采样,实现了相互关联的多路信号的采集。并对整个电路进行了仿真。仿真结果证明了电路设计的正确性。     

基于ARM的数据采集系统硬件部分实现

本文详细的阐述了基于ARM处理器的数据采集系统硬件部分的设计与实现.整个硬件电路分成两个部分:主控电路部分和数据采集部分.在主控电路部分,我们完成了主芯片设计、存储器电路、串口电路、网络电路的设计.在数据采集部分,我们完成了信号调理电路、滤波器电路、A/D转换电路、D/A转换电路的设计.最后给出了系统硬件调试方法.     

一种手持式波形采集、存储及回放系统

介绍了基于MSP430F5438单片机的波形采集、存储与回放系统的设计,包括信号调理电路、A/D采样、D/A变换和滤波器等电路设计.输入信号经NE5532运放构成的预处理电路进行调理后,送至处理器自带的高速A/D进行采样、量化后存储,然后经过D/A转换变为模拟信号,再经过有源低通滤波器消除噪声干扰,最后通过信号调理电路输出到示波器上显示.     

一种可编程全数字锁相环的设计与实现

针对传统的全数字锁相环电路参数不可调、锁相速度慢及锁相范围窄的缺点,提出了一种可编程全数字锁相环。采用电子设计自动化技术完成了该系统设计,并对所设计的电路进行了计算机仿真与分析,最后,采用FPGA予以硬件电路的实现;系统仿真与硬件实验证明,该锁相环中数字滤波器和数控振荡器的参数可以自主设定,改变数字滤波器的参数可加快锁相速度,改变数控振荡器的参数可扩大锁相范围;该锁相环具有锁相速度快、锁相范围宽、电路结构简单、参数设计灵活和易于集成等优点,可适用于许多不同用途的领域。     

DSP应用系统中的硬件接口电路设计

介绍了DSP应用系统的硬件接口电路:包括电平变换电路.仿兵器JTAG接口电路.以及可扩展的硬件接口(如A/D.D/A.SRAM)等的设计方法,并给出了接口电路在设计时须注意的几个问题.     

超声信号采集模块的设计

一种超声信号数据采集的模块,完成高频超声信号的高速采集;简单的介绍了该模块的硬件及软件设计;其硬件模块具体包括通过PROTEL软件设计的A/D采样硬件电路,USB系统的连接电路;软件模块包括利用Verilog语言完成FPGA状态机来控制A/D采样,针对具体功能的USB固件初始化程序,以及上位机对USB系统上传数据进行读取以及将所读取到的数据进行的图形显示;实验结果显示可以将采集到的数据高速传输至上位机后进行图形显示分析.     

基于DSP的有源电力滤波器控制系统的硬件设计

以TI公司的电机、逆变器控制专用DSP芯片TMS320LF407A为基础,介绍了关于有源电力滤波器控制系统的硬件设计.包括DSP芯片的工作电路设计、外围信号采集电路的设计及IGBT智能功率模块IPM的设计.     

A/D器件的发展

A/D器件是整个通信系统中的关键所在,也是整个系统的瓶颈,国内外科研机构一直投入大量的物力、人力、财力致力于A/D器件的研究。通过分析总结A/D器件的国内外发展近况,总结得出了A/D器件的发展瓶颈,即采样速率的不断提高带来的孔径抖动问题以及ADC采样电路固有的限制。必须解决瓶颈问题,才能设计实现更高性能的A/D器件。     

便携式心电遥测系统中A/D转换的实现

传统的心电信号模数转换电路大多采用并行的A/D转换芯片,所以系统体积较大、功耗也大,不便于使用电池供电和随身携带。为解决上述问题提出了一种体积小、成本低、功耗低的心电信号A/D转换设计方案。在硬件电路开发设计中使用的是12位串行的A/D转换芯片MAX187,其转换速度并不慢,完全满足对心电数据采样的要求。详细地给出了AT89S51单片机与MAX187的接口以及单片机对MAX187的控制程序,具有很好的应用价值。     

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     

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。     

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。