基于USB的多路数据采集器

提出了一种基于USB的多路数据采集系统的设计方法。该系统利用ARM＋FPGA＋AD7656的系统组合实现16路通道信号同步采样,其中FPGA完成对A／D转换的逻辑控制,使用ARM7处理器对A／D转换数据进行处理,再通过USB接口与计算机进行数据通信。测试结果表明,基于FPGA与ARM的多通道数据采集系统结构简单盛制方便...     

多通道高速实时数据采集与处理平台的设计

针对红外导引头多元信息探测和实时数据处理要求,设计了基于FPGA和DSP的多通道高速实时数据采集和处理平台;在该平台中,通过FPGA实现了DSP的引导、多通道高速A/D、D/A、大容量存储器(SDRAM和FLASH)和数字I/O等功能模块的无缝链接及逻辑控制;利用时序分配和EDMA(扩展的直接存储器访问)技术以及McBSP(多通道缓冲串口)和HPI(主机口),实现了FPGA和DSP之间实时传输与通信控制;实际应用表明在该平台中A/D与FPGA之间串行传输速率可达20MHz,FPGA与DSP之间串行传输速率可达70MHz,且平台运行稳定、可靠,满足了红外导引头的实时信号处理要求。     

基于CY7C68013与FPGA的便携式数据采集系统

从系统总体结构设计、硬件设计和软件设计三个方面阐述了基于CY7C68013和FPGA的多通道数据采集与处理系统的设计方法.方案采用FPGA实现了A/D转换芯片的控制、数据读写、对CY7C68013内部FIFO的读写控制以及信号的逻辑处理.通过调用USB驱动程序,电解槽应用程序实现了数据的处理、显示和存储.分析与测试结果表明,本系统是一种通用性很强的数据采集系统,符合工业生产控制的需要.     

基于FPGA的MAX192控制器仿真设计与研究

为减轻微处理器频繁控制A/D转换器转换时序与读取A/D转换结果的负担,提出串行 A/D转换器 M AX192的FPGA控制方法。根据M AX192多通道转换时序的特点,设计基于FPGA的多通道转换控制器和 A/D转换结果寄存器阵列。由微控制器指定采样周期、采样点数、采样通道顺序和最大转换通道数等参数来控制 FPGA ,对M AX192进行转换,且每个采样通道配置1个结果寄存器组,其数量由最大采样通道数决定。仿真结果表明,基于FPGA的M AX192控制器对多通道信号连续转换时,每个通道的平均转换时间与单通道单独转换相比减少了37.5％;结果寄存器可及时存储每次转换结果,便于微处理器及时读取A/D转换结果进行后续快速数字信号处理运算,提高了数据采集系统的实时性,具有工程应用价值。     

FPGA在膜式氧合器测试数据采集系统中的应用

针对膜式氧合器测试中多传感器数据采集的特性,设计了一种医用膜式氧合器氧扩散渗透率检测的多路数据采集系统;系统以FPGA为主控制模块,对FPGA硬件资源进行功能划分,分别实现A/D转换控制、FIFO数据缓存、时钟分频等功能,最后通过USB接口实现了数据传输;系统经过时序仿真及数据传输测试,已达到了实际膜式氧合器数据采集的相关指标,验证了设计思想的正确性.     

基于FPGA多通道同步数据采集系统设计

结合数据采集在往复式压缩机在线监测系统中的应用,设计了以FPGA（现场可编程门阵列）为核心的逻辑控制模块的多通道数据采集系统。整个采集系统可实现16路最大工作频率为100kHz的模拟信号的采集。设计中采用了自顶向下的方法,将FPGA依据逻辑功能划分为几个模块,详细论述了各模块的设计方法。各逻辑模块设计使用VHDL语言,并在ISE中完成软件设计和仿真。     

基于USB总线的多通道数据采集系统设计

介绍了以FPGA为控制核心、以USB2.0为数据接口的多通道数据采集系统,通过对模/数转换器件(ADS8365)的控制完成4路信号的采集。系统包括信号调理模块、模/数转换模块、FPGA控制模块、数据缓存模块和USB接口模块。系统的A/D转换精度为16 bit,采样率为27 kHz,保证了数据采集的准确性和实时性。此外,系统还具有一定容量的FIFO数据缓存,方便与其他系统进行数据交换。     

一种多通道自动扫描A/D转换模块的设计

A/D转换模块用于扩展CompactPCI计算机系统的数据采集功能;该模块通过CompactPCI总线与主机通讯,通过AD7612实现750ksps、16Bit的模拟/数字转换,完成数据采集功能;在设计上采用CPLD、FIFO和RAM实现多通道的自动扫描,提高了模块数据采集的智能化设计;采用磁隔离器件实现A/D转换的数据和控制信号的隔离,提高了数据采集的精度;该模块已经在产品上应用,性能稳定。     

基于△-∑技术和FPGA的数据采集系统

为了改善传统数据采集系统运算能力差、分辨率低、可靠性低等缺点,结合△-∑技术和FPGA,设计了一种多通道、高分辨率、宽动态范围的新型数据采集系统.提出了一种由△-∑A/D转换芯片、高性能FPGA和DSP组成的数据采集系统方案及其硬件电路实现方法.系统利用A/D器件对信号进行滤波、放大、差分转换和模数转换,利用FPGA设计内部模块和时钟信号进行电路控制及实现数据缓存、数据传递等功能,由高速DSP芯片核心控制,对采样数据进行实时处理.系统能实现24位高分辨率、宽动态范围的信号数据采集与高速实时处理,可用于电压、电流、温度等参量的采集系统中.     

基于Δ-Σ技术和FPGA的数据采集系统

为了改善传统数据采集系统运算能力差、分辨率低、可靠性低等缺点,结合Δ-Σ技术和FPGA,设计了一种多通道、高分辨率、宽动态范围的新型数据采集系统。提出了一种由Δ-ΣA/D转换芯片、高性能FPGA和DSP组成的数据采集系统方案及其硬件电路实现方法。系统利用A/D器件对信号进行滤波、放大、差分转换和模数转换,利用FPGA设计内部模块和时钟信号进行电路控制及实现数据缓存、数据传递等功能,由高速DSP芯片核心控制,对采样数据进行实时处理。系统能实现24位高分辨率、宽动态范围的信号数据采集与高速实时处理,可用于电压、电流、温度等参量的采集系统中。     

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。