基于FPGA的高速模拟量采集系统设计

本文介绍了以FPGA为平台的高速模拟量采集系统，重点说明了FPGA高速模拟量采集逻辑模块设计。针对机载系统中存在多种类多数量的模拟量采集需求，设计一种通用的高速模拟量采集系统，在FPGA中将采集值计算为浮点数，处理器软件中仅需进行数据转换即可得到采集结果。利用FPGA并行采集、并行计算可实现高速采集。以16路模拟量采集进行了仿真和试验验证。     

基于正则表达式的Web资源采集系统的设计与实现

介绍了Web资源类型和采集策略中的对采集质量有影响的因素。设计实现了一套基于正则表达式的Web资源采集系统,系统具有灵活的可扩展性和可配置性,重点介绍了采集系统结构和采集技术。     

基于正则表达式的Web资源采集系统的设计与实现

介绍了Web资源类型和采集策略中的对采集质量有影响的因素。设计实现了一套基于正则表达式的Web资源采集系统,系统具有灵活的可扩展性和可配置性,重点介绍了采集系统结构和采集技术。     

机械密封端面微小形变图像采集系统设计

在机械密封数字散斑微小形变测量系统中,图像采集是必不可少的一部分;使用Matrox Solios ecl/xcl图像采集卡、BaslerA504KCCD相机及自主开发的外触发采集光电转速同步器构建了采集系统的硬件架构;基于VC++2008调用MIL9.0库函数开发了图像采集软件系统;为了满足不同的采集要求,该采集系统设置了静态及外触发两种采集方案;介绍了图采卡的采集模式、相机曝光的触发方式及如何配置DCF文件。给出了在VC++2008的MFC应用程序解决方案中采集软件的设计流程;给出了MIL对象的定义、初始化以及外触发采集的主要源代码;应用表明,该图像采集系统能很好地采集并保存完整清晰的图像,为后续的图像处理、分析工作奠定了基础。     

高精度通用型混合采集电路设计

针对数据混合采集系统存在不适用性,采集精度低的问题,设计了一种通用性高,采集和隔离采集混合采集系统。系统各个板卡之间由板间连接器对插级联,增强了通用性和可扩展性。在原有采集卡的基础上增加隔离采集卡,隔离采集是对同类不同路输入信号、不同类信号、待采集信号和模拟开关做隔离处理。硬件方面由主控卡FPGA统一控制采集,只用一级模拟开关选通;采用线性光耦隔离待采集信号与模拟开关,DC/DC提供不同隔离电源,数字隔离器隔离控制信号,这些措施减小了信号震荡,降低了分层值,提高了采集精度。软件方面改进了ROM表的编码规则,简化了硬件电路,释放了负载压力;通过分析AD采集时序,做到精准采样转换。经试验验证,该设计采集精度可以满足3‰精度要求,具有较高的使用价值,现已被工程采用。     

基于FPGA的高速采集系统设计与实现

给出了高速采集系统的实现架构及控制原理,并在分析数据采集系统现状的基础上,针对高速采集系统存在的采集和传输速度、资源利用不合理以及硬件成本偏高等问题,给出了一种共享总线、同步采集、分时读取的方法。实践表明,采用该方法提高了系统的采集和传输速度,实现了对多通道、高分辨率并行A/D同步采集的有效控制,节省了FPGA系统资源,降低了硬件成本。     

基于OpenCV的双幅图像采集系统设计与实现

数字图像采集是图像处理技术应用中的基础,传统的图像采集系统一般只针对单幅图像采集,而且随着技术的发展,在许多实际应用中要求采集双幅图像.论文先介绍了图像采集相关原理,并对双幅图像采集系统进行了设计,然后详细介绍了双幅图像采集开发的主要步骤,最后采用Opencv技术开发双幅图像采集系统.实验结果显示,该系统具有采集速度快,系统易读性和可移植性强的特点,很好地满足双幅图像采集的要求.     

X光信号采集模块的设计与实现

本文设计了一种X光信号采集模块。在给出了信号采集模块设计方案基础上,设计了信号采集模块的硬件电路,包括信号调理电路、A/D转换电路,制作了电路板,并进行了实验与调试。本文所设计的信号采集模块能够实现X光信号的高速采集功能。该高速X光信号采集模块能够用于物流中货物和生产线中高速运行产品的无损检测,具有较高的应用价值。     

一种面向主动安全的动态采集策略设计与实现

面向分布式集群主动安全,为降低信息冗余的同时保证精度,设计了一种计算机资源状态信息动态采集策略。通过对集群中的10种状态信息(共计164项)进行分析,研究了其阈值与系统状态是否正常之间存在的关系,通过筛选、分组实现动态采集策略的设计。实现对状态信息的采集,保证了对资源的低占用,实现了动态采集策略的即时生效。通过故障注入方法模拟系统状态异常时的运行状态,通过对比采集结果的数据量大小,衡量动态采集策略,降低信息冗余的有效性。实验结果表明,该采集策略有效地降低了信息冗余并保证了采集精度。     

基于PB利用摄像头批量采集照片系统的实现

目前,大量数码照片的采集在各方面有广泛的应用,使用常用的摄像头结合数据库技术进行批量数码照片的采集,可以降低成本,提高效率,解决现有数码照片采集中的一系列问题.介绍了一种使用PowerBuilder工具开发的基于摄像头和数据库技术实现的批量照片采集方法,实现了快速大批量的照片采集,解决了目前照片采集方式存在的问题,满足大量照片采集的需要,提高了工作效率、节约了时间和成本.该方法在考试系统的考生照片采集中进行了应用,取得了较好效果.     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.