基于FPGA的多通道同步实时高速数据采集系统设计

为了满足精密设备监测过程中对数据采集的精确性、实时性和同步性的严格要求,设计了一种基于FPGA的多通道实时同步高速数据采集系统。本系统采用Xilinx公司的Spartan6系列的FPGA作为核心控制器件,实现了数据采集控制、数据缓存、数据处理、数据存储、数据传输和同步时钟控制等功能。经测试验证,该方案具有精度高、速率快、可靠性好、实时性强、成本低等特点。     

基于PCIe总线的数据采集卡设计与实现

为了实现对多路高速光信号采集,利用FPGA设计基于PCIe总线的数据采集系统;对PCIe总线低速Slave通道与高速DMA通道的关键算法进行了研究;首先,介绍了数据采集卡的硬件构成及基本工作原理,提出了PCIe总线算法需要解决的数据传输问题;然后,分析数据采集卡PCIe总线低速Slave通道和高速DMA通道原理以及实现的关键算法;通过Modelsim和SignalTap工具分别对数据传输算法进行功能验证和在线仿真;最后,将设计数据采集卡互联PCIe上位机进行实际测试;实验结果表明,本设计PCIe总线采用X4接口模式,数据传输系统的数据上传峰值速率为615.38 MB/s,可以满足稳定可靠、高带宽、模块化等要求。     

基于FPGA的多通道多量程数据采集系统设计

为了实现多路模拟信号的准确采集、记录和显示,设计了一种基于FPGA的多通道、多量程数据采集系统。该系统采用FPGA作为主控芯片,通过FPGA内部的控制模块控制A/D数据转换和UART接口数据传输,并在FPGA内部完成数据处理。FPGA与上位机之间采用RS-232串口实现数据通信,上位机采用Viusal Basic编写监控界面,实现远程控制和显示。该系统具有性能稳定、实时性强、操作界面友好、可扩展性强等特点。     

基于FPGA和USB接口的多通道导航信号采集系统设计

针对无线电导航系统中多通道信号处理需求,设计了一种基于FPGA和USB接口的低成本、快速、和高可靠性的多通道数据采集系统;详细介绍了系统结构以及FPGA控制SRAM芯片实现数据缓存的关键技术,运用FPGA内部的硬件调试工具(SignalTapⅡ)验证了系统数据传输的可靠性能;系统可靠传输速度可达20Mbytes/s,可广泛用于多路、高速信号采集场合,已投入到实际应用。     

振动信号采集及网络化传输关键技术的FPGA实现

设计了一种基于FPGA（现场可编程门阵列）的多路转换模拟通道寻址技术的变频率采样方法，针对机械振动信号数据量较大、实时性要求较高的特点，提出了基于FPGA来实现的以太网传输方式。把数据采集控制、数据缓存、数据封装以及数据传输控制都集成在一块FPGA芯片里，并通过硬件描述语言VHDL来实现。     

基于FPGA的阵列感应测井数据采集系统设计

针对井下高温、高压的恶劣环境,井下数据采集系统的准确、稳定的工作是一个重要问题;数据采集系统具有8个主数据采集通道,每个通道最高支持2MSPS的采样率;以现场可编程门阵列FPGA为核心处理器,实现系统的逻辑控制以及正交解调处理;选用高性能、高可靠性的CAN总线完成本系统与上位机的数据传输;指出了系统设计中需要注意的问题,并且讨论了其中关键部分的具体实现;经过实际测试验证,本系统设计正确合理,工作稳定,达到了设计要求。     

FPGA在石油勘探多通道数据采集系统中的应用

为了准确的分析地下石油的储量和位置,需要在施工测线上大量的物理点同时观测地震波并对其进行分析,文章中设计了一款石油勘探多通道数据采集系统;FPGA是系统的主控制模块,其硬件资源按功能可划分为A/D、D/A逻辑控制,时钟分频,数据缓冲区控制,电源监控,双端口逻辑控制,PCI9054控制等功能;FPGA通过PC104+总线与上位机进行数据传输;该系统经过时序仿真及硬件调试,已经达到了多通道数据采集的各项指标,验证了最初设计思想的正确性。     

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...     

基于PXI总线的LVDS数据采集存储模块的设计

鉴于SAR原始数据量大以及数据传输速率限制的问题,设计了基于PXI的雷达回波和图像数据实时记录模块。大容量数据采集记录系统基于通用的商业PC平台设计,选用FPGA作为主控芯片对电路整体逻辑进行控制;利用LVDS作为数据传输接口对数据进行接收,实现了数据采集、缓存以及通过PXI总线上传至上位机硬盘,以便后续处理。文中介绍了系统方案的总体设计,以及采集存储硬件电路的设计,并对电路的关键技术给以详细的分析。     

FPGA在多路数据采集系统中的应用研究

数据采集系统在测量、控制、信息处理等多学科领域有着广泛的应用,传统的以单片机为核心的多路数据采集系统原理简单、技术成熟、选型方便,但也存在的外围芯片多、电路复杂、不易升级与改进等缺点;鉴于此,提出了一种以FPGA为逻辑控制核心的多路数据采集系统设计方案,重点介绍了关键器件的选择、FPGA功能模块设计、FPGA外围电路设计;并结合部队实际需求,成功地将这一方案应用到武器装备测试系统的研制过程中,体现了较高的军事及经济价值。     

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     

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。