基于FPGA的嵌入式系统的研究与应用

嵌入式系统是嵌入到对象体系中的专用计算机系统，包括硬件和软件两大部分。设计中使用的硬件是Altera公司开发的NIOSⅡ嵌入式处理器软核及用户逻辑。文章主要介绍FPGA和SOPC的特点及其发展趋势以及如何使用Quartus Ⅱ42和NIOSⅡIDE等开发工具在FPGA器件上实现SOPC的设计。     

NIOS Ⅱ处理器中定制指令的设计与实现

概要介绍NIOS Ⅱ处理器,详述NIOS Ⅱ处理器中定制指令的硬件实现和软件接口。并结合实例说明在进行SOPC设计时,可以把强实时软件算法或费时的软件计算作为定制指令,加入到NIOS Ⅱ处理器指令集中,提高系统性能。     

基于SOPC的1553B总线通用接口设计

在研究国外先进协议芯片的基础上,提出了一种基于SOPC技术的1553B总线BC/RT/MT通用接口的设计方法;通过外加模拟收发器,将NIOSⅡ软核处理器与各种功能模块集成在FPGA内部,实现了1553B总线通用接口功能;最后以TMS320LF2407作为宿主机,在NIOSⅡIDE开发环境中针对通用接口BC/RT/MT工作模式分别进行了整体测试,初步测试表明通用接口能够完成1553B总线通讯任务;SOPC技术实现了硬件设计软件化,大大增强了总线接口电路设计的灵活性,缩短了设计周期,提高了系统性能与通用性,有利于系统的扩展。     

NIOS II处理器中定制指令的设计与实现

概要介绍NIOS II处理器,详述NIOS II处理器中定制指令的硬件实现和软件接口.并结合实例说明在进行SOPC设计时,可以把强实时软件算法或费时的软件计算作为定制指令,加入到NIOS II处理器指令集中,提高系统性能.     

基于Nios Ⅱ的自动指纹识别系统设计

介绍基于Nios Ⅱ处理器的嵌入式自动指纹识别系统的实现方法；具体说明自动指纹识别系统的基本原理、系统总体结构、硬件结构设计、用户自定义指令的设计，以及指纹识别算法的处理流程和实现方法。     

双NIOSⅡ软核系统在潮流能发电中的应用

开发海洋潮流能对缓解能源危机具有重要意义,电力变换系统是潮流能发电系统的关键技术之一。提出了一种利用SOPC技术实现潮流能发电电力变换控制系统的设计方法,采用单片高性能FPGA芯片构建双NIOSⅡ软核系统,其中一个NIOSⅡ处理器负责系统任务调度和能量管理,一个NIOSⅡ处理器负责电力变换控制和异常诊断。针对电力变换系统的信息数据特点,提出了基于RAM、FIFO、GPIO的双NIOSⅡ处理器握手机制,并给出了系统的具体设计实现。该双NIOSⅡ处理器系统提高了系统的任务调度灵活性、控制算法处理速度和应急处理能力。     

双NIOS Ⅱ软核系统在潮流能发电中的应用

开发海洋潮流能对缓解能源危机具有重要意义,电力变换系统是潮流能发电系统的关键技术之一。提出了一种利用SOPC技术实现潮流能发电电力变换控制系统的设计方法,采用单片高性能FPGA芯片构建双NIOSⅡ软核系统,其中一个NIOSⅡ处理器负责系统任务调度和能量管理,一个NIOSⅡ处理器负责电力变换控制和异常诊断。针对电力变换系统的信息数据特点,提出了基于RAM、FIFO、GPIO的双NIOSⅡ处理器握手机制,并给出了系统的具体设计实现。该双NIOSⅡ处理器系统提高了系统的任务调度灵活性、控制算法处理速度和应急处理能力。     

基于NiosII的自动指纹识别系统设计

介绍基于Nios II处理器的嵌入式自动指纹识别系统的实现方法;具体说明自动指纹识别系统的基本原理、系统总体结构、硬件结构设计、用户自定义指令的设计,以及指纹识别算法的处理流程和实现方法。     

基于SOPC的望远镜多策略控制器设计

基于NIOS II为核心的可编程片上系统(SOPC),设计可重构的SOPC硬件配置和控制软核,将简单文件传输协议服务器扩展为专门的传输写入服务器,完成远程在线导入多个SOPC硬件配置和控制软核,并制定硬软件远程切换流程,从而实现基于FPGA3C25的多策略控制器设计。在大型望远镜控制系统中的成功应用验证了该设计的可行性。     

基于SOPC的指纹识别模块设计

随着EDA技术及微电子技术的飞速发展,现场可编程门阵列（Field Programmable Gate Array,简称FPGA）的性能有了大幅度的提高。以Nios Ⅱ软核处理器为核心的SOPC（Systemon Programmable Chip）系统便是把嵌入式系统应用在FPGA上的典型例子,本文设计的指纹识别模块就是基于FPGA的Nios Ⅱ处理器为核心的SOPC设计。通过IP核技术和灵活的软硬件编程,实现Nios Ⅱ对FPGA外围器件的控制,利用SOPC Builder将Nios Ⅱ处理器、指纹读取接口UART、键盘与LCD显示接口、FLASH接口、SDRAM控制器构建成Nios Ⅱ硬件系统,后者是电源和时钟电路、SDRAM存储器电路、FLASH存储器电路、LCD显示电路、指纹传感器电路、FPGA配置电路这些纯实物硬件设计。     

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.