基于LAN91C111的嵌入式高速网络设计

网络在工业控制领域的应用日益广泛,嵌入式以太网具有良好的应用前景.提出了一种性价比较高的嵌入式高速网络设计方案,采用高速DSP和高性能网络接口控制芯片完成基于LAN91C111网络芯片的嵌入式网络系统的开发.详细分析了嵌入式系统中TCP/IP协议栈的各协议的选取,并给出了网络接口控制芯片的处理流程.     

基于DSP的嵌入式CAN／Ethernet网关设计

为了实现现场设备与以太网之间的数据通信,使信息交换深入到工业现场,做到底层设备与以太网的无缝连接,提出基于DSP的CAN总线与以太网互联的方案.介绍了DSP与以太网接口方法和CAN/Ethemet间的协议转换方法,采用嵌入式网络接口设备在网络环境下的自识别、自描述和互操作性技术,实现网络传感器动态配置和重构功能.测试结果表明,嵌入式CAN/Ethemet网关满足自动化设备维护系统的实时性和可靠性要求.     

基于F28M36的EtherNet/IP从站设计

分析了一种全新的工业以太网协议EtherNet/IP,并从源代码的角度阐明了其基本原理。基于TI的DSP+ARM双核芯片F28M36设计了一款采用以太网传输的伺服控制系统控制卡,移植了UCOSII操作系统、CIP协议、嵌入式TCP/IP协议和网络芯片驱动,最终实现了工业以太网协议EtherNet/IP协议的成功移植。     

基于嵌入式DSP以太网接口的设计与实现

本文以数字信号处理器和网络控制器为核心,设计了嵌入式DSP系统接入以太网硬件平台,并简化网络层次体系结构.完成相应的网络应用软件的设计,实现了嵌入式系统通过以太网与计算机进行通信功能.     

一种基于PIC单片机的嵌入式以太网接入系统

本文构建的系统是以PIC16F877单片机作为嵌入式系统的中央处理单元,并通过硬件集成电路S-7600A协议栈芯片来实现TCP/IP协议栈.因为以太网已经成为一种广泛的接入Internet的方式,可以通过RTL8019A以太网控制芯片把该系统接入以太网,然后通过以太网接入Internet,从而可实现对此嵌入式系统的远程访问和控制.     

嵌入式DSP系统Internet技术的实现

提出了一种在嵌入式数字信号处理器系统中实现以太网通讯的解决方案.将TI公司的数字信号处理器TMS320F2812与以太网接口芯片DM9000A相结合,在2812 DSP芯片上移植了μC/OS-II操作系统和LwIP轻型以太网协议栈,并用软件方式实现了TCP/IP网络协议,从而达到嵌入式系统同Internet通信的目的并已得到应用.系统结构简单、性价比高,具有广泛的应用前景.     

基于DSP的以太网通信接口设计

介绍了以DSP为核心,具有以太网接口的嵌入式系统硬件电路组成和软件设计方法。详细地介绍了网络控制器RTLS019A的工作原理及DSP硬件电路设计。解析了嵌入式TCP／IP协议在DSP硬件上的移植,在此协议栈的基础上,完成了上层协议的编写和实现。     

嵌入式Ethernet通信终端的设计

本论文主要介绍TCP/IP协议簇的相关核,心协议及以Ethernet协议为代表的802.3协议在嵌入式DSP终端的实现.论文在网络通信协议深入分析基础上,对协议进行合理精简,详细论述了简化后协议在嵌入式DSP通信终端的具体实现方法,并设计和提出嵌入式DSP以太网终端系统软/硬件方案--"Ethernet Over DSP"方案,给出该方案的具体硬件原理和软件实现机理.     

基于嵌入式控制器的远程监控系统的开发

随着信息与网络技术的发展,嵌入式系统渗透到各个领域,得到了广泛的应用.嵌入式远程监控系统是工业以太网的重要应用领域.本文提出了以DSP芯片为依托,以TCP/IP为通信协议,实现仪器仪表、传感器等进入Intemet,从而实现远程监控为目的的设计方案.作者详细阐明了嵌入式控制器的硬件和软件的设计和实现过程,包括微处理器系统硬件设计、与智能仪表的接口模块实现、TCP/IP协议分析等.     

基于ZigBee的无线传感网络网关的设计

文章介绍了一种基于ZigBee协议的无线传感器网络的网关设计整体方案.以Intel PXA270为核心处理器,处理器通过以太网接入芯片、GPRS模块、符合IEEE802.15.4协议的CC2430射频芯片,分别接入以太网、GPRS网络和无线传感器网络.移植精简的嵌入式TCP/IP协议,分析Z-Stack协议栈,实现两种...     

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.