ARM与DSP之间视频数据可靠传输的设计与实现

在由ARM+DSP组成的嵌入式视频处理平台当中,需要将视频数据从DSP端发送给ARM处理器,以便ARM将视频数据传输到远端服务器进行处理.提供了一种ARM与DSP双核之间视频数据通信的解决方案,并介绍了ARM与DSP之间通过HPI进行连接的硬件电路设计.在HPI接口驱动程序的设计中,基于Linux中断处理机制定义并实现了一种实用的视频数据通信协议,从而实现了ARM与DSP双核之间视频数据的可靠传榆.     

ARM与DSP的SPI通信设计实现

提出一种测量仪器的多处理机分布式控制方案,并对DSP与移植了Linux操作系统的ARM之间SPI通信设计进行了着重阐述.对于这样的特定系统,首先要完成Unux下的SPI驱动程序开发,然后才能进行ARM和DSP下的应用程序开发.对这几个方面进行了详细介绍,给出了一种ARM与DSP通信的通信协议,并基于此协议实现了ARM与DSP的SPI通信.     

基于DSP和ARM的自适应振动信号采集系统

本文提出并设计了一种能够实现增益自适应功能的振动信号采集系统,该系统采用数字信号处理器（DSP）及嵌入式处理器（ARM）。该系统特点是能够根据被测信号的幅值变化自动调节放大器的增益,因而使得系统具有较广泛的适应性。同时利用SPI接口进行DSP与ARM之间的通信和数据传输,实现了高动态范围振动信号的高速采集。     

DSP控制的以太网通信解决方案

为了实时采集基于DSP的电力电子变换电路控制器的运行数据,通过ARM芯片及以太网PHY控制器芯片提供一种以太网通信解决方法。采用DSP中的SPI串行接口与ARM中的SPI进行数据交换,利用ARM中带有的EMAC控制器以及以太网控制芯片DP83848设计出以太网控制器,实现以太网通信。考虑到系统简化及数据速率问题,在通信协议方面采用UDP协议,采用LabVIEW设计以太网上位机界面。     

基于双口RAM的ARM与DSP通信接口设计

提出了一种基于双口RAM的ARM与DSP通信接口的设计方案。该接口以ARM为主处理器、DSP为协处理器,ARM通过在Linux系统上建立的DSP任务管理线程实现DSP任务的管理和调度工作,DSP完成ARM下发的数据计算和处理工作,两者通过双口RAM交换数据。实际应用表明,该接口充分利用了两个处理器的功能特性,数据传输速度快,适用于ARM与DSP间需要进行大量数据交换的场合。     

基于DSP和USB的安全数据交换系统

在研究现有数据安全传输方案的基础上,设计并实现了一种基于DSP和USB接口的数据安全传输方案.该方案设计研制硬件安全板卡,硬件采用高速DSP芯片实现协议控制和密码算法,采用USB和EMAC作为数据传输接口.数据交换软件设计私有安全可靠通信协议,执行DES、AES、RSA等标准安全加密算法,保证数据的物理隔离和安全传输.测试证明,安全数据交换系统能够实现数据的机密性、完整性、不可否认性,保证数据可靠传输,具有较高的传输速率.     

网络信息安全无反馈单向传输系统的设计与实现

在网络不同的安全域之间传输文件时,要求数据只能由低密级网络向高密级网络传输。介绍了位于不同安全域的两台计算机之间实现单向传输的原理和技术。系统地阐述了如何利用Atmel公司的ARM9芯片AT91SAM3U4E控制USB设备和SPI接口,结合光耦芯片6N137,从硬件和软件两个方面来实现无反馈数据单向传输。通过实验验证该系统利用USB2.0接口技术、SPI的DMA传输方式以及光耦隔离技术实现了快速、单向、可靠的数据传输。     

基于OMAP处理器的核间通信机制设计与实现

为满足嵌入式多核数控系统高速、高精的应用需求,针对现有多核通信延迟过高、通信数据量过小等不足,研究基于ARM与DSP双核架构嵌入式数控系统,设计并实现一种基于该数控系统平台的多核数据通信机制。该通信机制基于共享内存实现,包括硬件驱动实现、内存划分、通信同步、共享缓存池建立以及通信协议搭建等关键部分。针对双核间数据传输延迟和数据传输量2个影响系统性能的重要参数开展实验测试,并于实际数控系统环境进行应用测试,结果表明,该通信方法可满足ARM与DSP双核架构的嵌入式数控系统2 MB数据通信量与20 ms通信延迟的性能需求。     

突发通信中ARM与DSP同步通信接口研究

针对流星突发通信中实时高速数据传输的系统需求,采用ARM核芯片AT91RM9200作为核心微控制器.TMS320C6713B作为数字信号处理器,提出了基于ARM与DSP之间同步串行通信接口的系统实现方案,并给出了系统的硬件原理图、控制方法及基于Linux的主要硬件接口驱动程序设计.硬件测试结果表明,该系统通过中断方式可以实时高速的接收由DSP发送到ARM的数据,实现流星余迹通信的实时信号处理和数据传输.     

多DSP系统间LinkPort数据同步传输技术研究

TS201高速通信接口LinkPort传输速率高、抗干扰强,可满足多DSP系统内数据实时快速交互。但由于缺乏握手机制,各DSP系统间LinkPort数据传输不同步,容易产生传输超时错误和乱序现象。在分析LinkPort工作机理的基础上,提出多DSP系统间LinkPort数据同步传输技术,利用通用输入输出信号和中断信号握手来实现多个DSP系统间LinkPort数据同步传输,有效地解决了LinkPort传输不同步造成的超时错误和乱序现象,使收发设备之间可以准确地同步,提高了传输的效率和准确性。     

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.