基于S3C2440和SM501的嵌入式系统硬件设计

针对嵌入式系统中大图形显示、高分辨率视频播放难的问题,基于ARM处理器和多媒体协处理器SM501提出了一种高效可行的解决方案,给出了硬件模型和实现方法。经过测试对比,此系统较传统的嵌入式系统具有明显的优势,较完美地解决了嵌入式系统中难以进行火图形显示和高分辨率视频播放的问题。此设计思想和方法不仅仅局限于S3C2440处理器,还同样适合目前ARM系列所有处理器,是解决嵌入式系统大图形显示、高分辨率视频播放的一种新途径。     

基于ARM的局域网视频播放系统的设计

提出了一种基于ARM处理器的局域网视频播放系统的设计方法,将系统分为控制端、服务器端和播放终端三大组成部分,并分别对三个部分的可行性做了分析,为嵌入式局域网播放系统提出了一个可行性方案.     

基于ARM的嵌入式AVS视频播放器的设计

实现了一种基于ARM处理器的嵌入式AVS视频播放器的设计方案。该方案不需添加专用的AVS视频解码芯片,仅以ARM处理器以及外围模块为硬件平台,以嵌入式Linux为操作系统,通过向MPlayer软件添加AVS视频解码库的方法,实现了AVS视频播放功能,能实时播放25f/s,分辨率为640×480的AVS视频流。     

基于ARM处理器的MP3播放器分析与实现

提出了一种基于ARM处理器的MP3播放器的设计方法.此播放器采用ARM体系结构的ARM7作为系统控制器,利用USB接口下栽MP3歌曲,用Compactflashcard存贮MP3文件.用UML详细描述了嵌入式MP3播放器的开发过程,包括功能分析、硬件设计、软件设计、软件实现、系统编译、移植等方面.     

基于ARM系统高分辨率彩屏设计方法

随着嵌入式系统的使用越来越广泛,它可能需要使用较大的LCD屏或CRT作为显示终端,而目前常见的处理器的显示性能无论在图形显示速度还是分辨率上都达不到要求。本文以ARM体系结构为中央处理器,结合SiliconMotion公司的SM501为2D图形加速芯片,提出了在嵌入式系统中1280×1024高分辨率和24位真彩显示的设计方法。     

基于DSP和ARM的车牌识别系统设计

研究了一种基于DSP和ARM的嵌入式车牌识别系统,通过DSP实现视频图像数据采集、车牌识别算法处理、网络传输等任务;ARM处理器使用Linux系统调度和管理视频接收、视频显示、识别结果显示等控制任务。整个系统通过网络实现通信与同步。     

基于Proteus和Keil接口的ARM仿真开发

嵌入式开发需要良好的软硬件环境,目前ARM公司的开发工具ADS、RealView以及Keil与ARM核处理器结合的较好,但硬件开发平台昂贵.Proteus软件较好的解决了硬件仿真的问题,它支持外围数字电路和模拟电路与处理器协同仿真,可以随意搭建硬件虚拟仿真平台.针对Keil for ARM编译器,结合Proteus软件,以ARM处理器LPC2124介绍了如何构建ARM嵌入式开发平台进行源代码级调试的方法.为嵌入式系统学习提出了一种新的思路和方法.     

基于ARM和DSP的双核嵌入式视频监控系统

针对传统嵌入式视频监控设备集成度低,功能有限,响应速度慢,计算能力不足的问题,研究了一种基于ARM微处理器S3C6410与TMS320DM642 DSP双核体系结构的嵌入式视频监控系统。该系统采用CMOS摄像头采集视频数据,经DM642上算法处理后通过HPI高速并行接口传输给ARM处理器,ARM处理器负责对接收到的视频进行控制和LCD显示。重点阐述了ARM和DSP系统单元间的硬件连接方案,HPI接口驱动程序的设计实现,以及结合Linux异步通知和多线程技术的QT/Embedded客户端人机交互软件的编写。最后,移植了运动目标跟踪算法到DSP中并对整个系统进行实验测试,验证系统的性能。经实验证明,所设计的系统稳定可靠,视频清晰流畅,具有性能高、功耗和成本低、可扩展性强等优点,在嵌入式视频监控领域具有推广和使用价值。     

基于ARM的多通道专业MP3播放器设计

针对现有MP3播放器存在的不足,提出了一种基于ARM处理器的多通道MP3播放器的设计方法.并从系统的功能分析、结构设计、硬件设计及软件设计方面,详细描述了嵌入式多通道MP3播放器的开发过程.经调试实验证明.系统性能良好.     

基于ARM11的嵌入式视频采集系统设计

随着多媒体技术的高速发展,视频采集有了更多的实现方式。介绍了一种基于ARM11处理器和嵌入式Linux的视频采集系统,通过搭建视频服务器,使用USB摄像头进行实时采集,通过无线网卡进行网络传输,在客户端可利用Web浏览器进行视频播放。该系统能独立完成视频的采集与传输工作,经测试表明,系统设计合理,运行稳定,并可扩展于远程监控系统、智能家居等领域。     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.