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.     

提高Nand Flash性能的方法

在嵌入式系统中,Nand Flash因具有写入速度快、密度大的特点,因此特别适合用作大容量数据存储。但是在系统处理一些大量的视频数据和其他高分辨率数据存储的时候,Nand Flash的擦除和写性能难以满足要求。分析并实现了一种利用多片编程来提高Nand Flash擦、写性能的方案。实验中采用4片编程技术,结果表明,该方案可以将Nand Flash的写速率提高75.60%,擦除速率提高74.95%。     

基于USB2.0总线的NAND Flash检测及控制方法

在高速大容量存储装置设计中多采用NAND Flash存储器,针对目前采用串口检测坏块、实现数据读写的方法存在检测速度慢、等待时间长等缺点,提出了基于USB2.0总线的NAND Flash检测与控制方法。利用FPGA逻辑控制功能和高速USB接口芯片设计通信和控制电路,并通过上位机软件实现对Flash的命令、操作控制,由用户通过PC应用程序完成对NAND Flash的读写、擦除检测及坏块标定。经实验应用验证,该方法检测、读写速度快,使用灵活,能准确、有效实现数据的快速读写、擦除及坏块标定,可广泛应用于存储测试装置的设计研制中。     

一种高效的星载高速固态存储器坏块管理算法

随着卫星技术的发展和功能的多样化,星载固态存储器需要存储的数据量越来越大,存储速率越来越高,在轨寿命越来越长。基于NAND Flash的星载固态存储器的并行存储方案得到广泛应用。但是由于NAND Flash存在初始坏块,且Flash芯片中坏块分布离散性较大。当固态存储器存储速率较高,并行存储的Flash芯片数增多,坏块经叠加映射后,使固态存储器有效容量损失较大。针对高速固态存储器的坏块问题,提出了一种高效的坏块管理算法,通过对坏块进行地址映射和替换,使固态存储器初始有效容量与装机容量的比值在高速并行存储的情况下仍能保持在97%左右,提高了Flash芯片存储容量的利用率,延长了大容量星载高速固态存储器的使用寿命。     

掉电中断的嵌入式设备高可靠存储方案

嵌入式设备通常基于Flash存储器和TFFS文件系统构建数据存储方案,本文针对其存储性能和可靠性问题,提出了一种基于掉电中断的数据存储优化方案。该方案将频繁变化的数据缓存于内存中,仅在设备下电时将缓存数据写入文件,最大程度降低Flash擦写次数,避免设备掉电引起文件系统元数据不一致导致无法访问文件的可能,提高了设备存储可靠性,延长了Flash芯片使用寿命。     

针对Flash存储介质的数据恢复技术研究

针对Flash存储介质的数据恢复技术是信息安全领域中一个非常重要的研究课题。Flash存储介质有其独特的、不同于磁存储介质的存储特性,所以在数据存储方式上也与磁存储介质有所不同。针对Flash存储介质的存储特性而设计的闪存文件系统通过闪存转换层来实现数据的读写和芯片的管理。因此从文件系统级和芯片级两个方面对Flash存储介质的数据恢复技术进行了研究,并提出了下一步工作方向。     

基于STR71x的记录存储系统的设计与实现

数据存储是数据采集终端必须解决的一个问题.本文分析了数据采集终端采集的数据的特点,有针对性地设计一个记录存储系统,用于存储采集的数据.阐述了该记录存储系统基于STR71x系列微控制器片上Flash的实现方法.     

基于FPGA和千兆以太网的数据采集系统

针对某航空航天领域的探测装置传感器数据采集、存储和传输等需求,通过结合FPGA技术和千兆以太网接口,开发出了一种高效的数据采集系统,并对其进行了详细的分析与研究。以FPGA作为主控芯片,将采集的传感器信号通过AD7606转换器调理转换,并临时缓存到FIFO+RAM的存储结构中,经编帧处理后存储到NAND Flash中,通过千兆以太网口实时传输,测试结束后可回读出Flash中存储的实验数据。     

仿生矢量水听器水下监测记录装置

介绍了仿生矢量水听器水下监测记录装置的结构与功能,该装置使用FPGA控制ADS8365来采集两个仿生矢量水听器的声压与振速信号,并将采集到的数据用Flash进行存储,在实验完毕后将数据通过USB口读出,本系统也可以实现水声数据的实时监测与传输;为分别从方案设计、硬件实现及软件系统等方面进行了详细的研究和描述.     

适宜于嵌入式多媒体应用的Flash文件系统

嵌入式多媒体应用中大量数据存储在Flash上,本文以文件系统的方案解决数据存储的管理问题。对嵌入式多媒体应用中Flash文件系统的应用特点与关键设计进行了分析,设计实现了一个功能完整的文件代号管理、文件指针存取以及对应用透明的自动坏损管理的文件系统。针对嵌入式系统应用的需要,改进了本Flash文件系统的应用可靠性,降低了其系统资源开销。针对多媒体应用的数据特点,提出了存储内容自适应的坏损管理策略。仿真与实用的效果表明,本Flash文件系统适宜于嵌入式多媒体应用。     

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.     

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。     

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.     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

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.     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.