基于FPGA的多路同步实时数据采集系统

结合数据采集系统在电力系统中的应用,设计了一种基于FPGA的多路同步实时数据采集系统,该系统将多个功能模块集成到一片FPGA中,构成片上可编程系统,使用一片FPGA完成对A/D转换和双口RAM等模块的控制;给出了系统的硬件原理框图,并结合系统的设计方案对其中的主要功能模块进行了阐述;以此构成的多路同步实时数据采集系统具有性能稳定、实时性强、集成度高、扩展性灵活等特点。     

基于NIOSII的高速多路数据采集系统

针对复杂战场环境对数据采集的需求,利用FPGA构建了可编程片上系统(SOPC),实现了高速多路数据采集,详细论述了NIOSII嵌入式系统以及其外设的设计方法;传感器采集的数据经过高速AD转换后,由SOPC系统进行数据缓冲和格式转换并存入存储器,SD卡的使用方便了数据的存取、处理和存储空间的扩展;实验结果表明,该系统能够可靠、准确地对多路信号进行采集,且运行稳定.     

基于FPGA+ARM的高速U盘记录仪的设计

为了满足对高速串行数据长时间实时显示存储的要求,提出了一种采用FPGA十ARM作为主控制器结合大容量Flash缓冲的设计方案;系统前端采用FPGA串并转换并控制Flash进行数据采集,后端采用ARM进行实时显示存储;该系统采集速率高,能够采集高达8.45Mbps的输入数据,存储容量可扩;系统是针对两路输入速度高达460 800 bps的串行数据而设计的,经测试验证,数据存储可靠稳定,可广泛应用于飞行装置上.     

基于ADS8568的八路数据采集系统设计

为了提高某惯性测量单元的精度,需对其输出信号进行大量采集以建立误差模型.该惯性测量单元不仅包含6路惯性传感器信号(3路陀螺和3路加速度计),还包括两路温度传感器输出以提供温度补偿,所以设计了基于ADS8568的八路数据采集系统.该系统采用AD芯片ADS8568,实现8路模拟信号的同步采集;以FPGA为主控芯片,控制信号的采集存储;以8G bit FLASH为存储芯片,实现大容量数据的实时存储.经实验验证,该采集系统可以正确采集传感器输出数据,采集到的数据正确有效,可用于误差建模的分析,具有一定的工程实用价值.     

基于CPLD高速信号存储测试系统的设计

针对减振控制装置中高频振动信号的采集问题.本文设计了一种基于CPLD为核心控制电路的高速数据采集系统.该信号采集过程是由硬件电路控制,并实时将转换数据存储起来,信号转换后进而由计算机处理采集到的数据.实验结果表明,该电路能够准确有效地进行AID数据采集.     

FPGA技术在数据采集系统中的应用

该设计采用FPGA（FieldProgrammableGateArray）控制ADC0809进行数据采集,并对ADC0809采集到的数据进行缓存,这可加快数据处理的速度并防止数据丢失,使数据采集更加准确。系统中向上位机传送数据由单片机控制,并将其采集到的数据传送给LCD显示。使用FPGA扩展引脚可实现多路数据采集,可解...     

基于DSP与FPGA的高速数据采集系统的设计

针对传统数据采集系统的不足,根据电力系统数据采集要求,构建了以DSP和FPGA为核心的数据采集系统。系统以FPGA为主控CPU,实现对AD转换器的控制,并实现数据的存储功能。该数据采集系统可实现16路最大工作频率为500kSPS的模拟信号采集,适用于电网信号的高速采集。     

MC12429在存储示波表数据采集中的应用

在手持式存储示波表的设计中,以ARM实现高速数据处理和系统控制,以大规模FPGA为数字电路载体,利用MC12429为数据采集的可编程频率时钟源,通过ADC9288实现一个100M模拟带宽的示波表数据的高速采集,研制的样机表明该设计是行之有效的。文中介绍了数据采集结构设计,重点给出MC12429的转换控制、数据采样设计及实验结果。     

MC12429在存储示波表数据采集中的应用

在手持式存储示波表的设计中,以ARM实现高速数据处理和系统控制,以大规模FPGA为数字电路载体,利用MC12429为数据采集的可编程频率时钟源,通过ADC9288实现一个100M模拟带宽的示波表数据的高速采集,研制的样机表明该设计是行之有效的.文中介绍了数据采集结构设计,重点给出MC12429的转换控制、数据采样设计及实验结果.     

基于eMMC的128路数据采集系统设计

针对水下模拟船舱相关参数的高速多次采集存储任务,设计了一种基于eMMC的多通道数据采集系统。该系统以FPGA为主控芯片,控制8个通道模拟多路复用开关和8个AD转换器来实现128路信号同时采集。与传统采集系统相比,该系统以eMMC为存储单元,解决了传统的以Flash为存储模块的复杂的坏块检测与系统管理等问题。试验证明,128路数据采集存储系统的误差可控制在0.1%范围内,能够确保已存的数据可靠、有效。     

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。