基于闪存设备分区的新型虚拟EEPROM设备的设计与研究

针对当前嵌入式系统对于低成本迫切需求,研究并设计了一种基于闪存设备（NAND FLASH）的新型虚拟EEPROM（Virtual EEPROM）设备。该设备被虚拟为操作系统NAND设备分区使用,使用数据备份机制确保数据信息安全性。针对NAND只支持页面单元的编程操作,使用缓冲区日志更新的方法,高效地解决Virtual EEPROM字节编程问题。最后通过设计损益均衡层实现NAND存储块的统一管理,对坏块和寿命问题进行大幅优化。分析结果表明,Virtual EEPROM具备NAND快速编程特性,擦写寿命较EEPROM有很大优势。该设计架构具备很好的系统兼容性,可以扩展移植于多种嵌入式平台。     

视频监控系统中嵌入式Web服务器的设计与实现

在ARM2410平台上提出了一套安防系统中嵌入式Web服务器的软硬件方案。该方案通过使用多进程模型构造HTTP引擎来提高服务器的反应速度,使用SESSION保存客户端和服务器端的连接来提高系统的安全性与效率,改进基于Wcol法的智能预测算法来预测用户读取页面,从而提高服务器的效率。实验表明,该方案是正确的,与当前其他监控系统内置服务器相比具有安全性高、响应速度快、稳定性强等特点。     

USB-HOST实时数据采集嵌入式模块的实现

USB是一种得到了广泛应用的新型总线,被数据采集和仪器设备大量采用.文章描述了一种基于嵌入式USB主机的实时数据采集嵌入式模块,该系统由嵌入式USB主机控制器采实现数据存储,使仪器可以脱离PC独立运行和将数据存储在移动USB设备中,扩大了该设备的使用范围.     

基于加固计算机智能电池系统的研究与设计

为了改善加固笔记本电池系统性能,针对各种不同嵌入式计算机的电池供电需求,对加固笔记本样机供电技术进行研究,为其设计一套可通用的智能电池系统。利用嵌入式计算机都有串口的特点,将电池作为主机的串口设备进行管理而实现通用化。最后给出充放电性能曲线,表明在不同设备和系统下本系统工作良好,保证了加固计算机工作的高安全性,高工作效率,并具备广泛通用性。      

基于PIC32单片机的嵌入式远程控制器的设计

随着第三代智能网络视频监控技术的迅速发展,嵌入式网络监控设备的使用也越来越广泛。为解决远端智能网络监控设备更新维护与管理难度大、成本高的问题,应用PIC32MZ单片机设计了一种嵌入式远程控制器。该控制器充分采用POE(以太网供电)技术为控制器和网络监控设备供电,这样不仅大大减少了电源系统的复杂度,同时提高了系统供电的可靠性。该控制器将单片机与网络交换功能集成在一起,在单片机中嵌入精简的TCP/IP协议,利用Web Server实现管理端、控制器和远端网络监控设备的相互通信。通过管理平台或浏览器可以实现实时监控、远程更新以及断电复位等功能,整个系统设计兼顾成本、操作性以及安全性等方面,对目前的智能网络监控系统具有很高的实用价值。     

基于Linux的便携嵌入式设备电源管理解决方案

本文分析了嵌入式设备现有的节电技术和Linux系统的电源管理机制,并以iPAQ为例提出了一套使用以上机制来实现便携嵌入式设备的电源管理解决方案.     

基于嵌入式的车辆行驶记录系统设计

创新地提出一种基于3G技术的车辆行驶记录系统设计方案,系统以i.MX53微处理器作为嵌入式终端硬件平台,采用USB-CAN适配器模拟汽车行驶的各种数据,使用NEO-6M-0-001芯片接收GPS定位信息,3G模块采用SIM5320E传输数据,使用SSH框架开发上层管理网站;系统将车辆信息传送到服务器,通过Internet可以方便管理和使用,提高了数据的安全性、交互性和可靠性。     

嵌入式数据库SQLite的安全机制分析与设计

嵌入式系统已经成为了当今IT方面的热门话题。随之而来的嵌入式数据库的安全问题更得到了重视,本文设计了一套相对比较可行的安全机制。保持了嵌入式数据库的特性基础上,大大的提高了使用的安全性。     

嵌入式Linux系统SQLite数据库加密功能的移植和应用开发

SQLite作为一个开源的嵌入式数据库,系统开销小,在嵌入式系统的开发设计中,用数据库SQLite对系统的批量数据进行维护管理,可以大大提高程序的运行效率。但开源版本的SQLite本身没有安全机制的支持,在当前数据安全的意识和要求越来越高的背景下,为嵌入式系统中SQLite移植增加加密功能后,安全性得以提高。     

嵌入式终端远程控制系统的设计与实现

为了更好地解决家庭环境中嵌入式设备远程控制的实际问题,本文建立了一个由家用嵌入式设备、服务管理平台等构成的远程控制系统,用户可以使用通用的Web浏览器通过Internet登录服务管理平台,由此来控制家庭环境中的嵌入式设备;介绍了系统的体系构架,并详细阐述了该体系的通信控制协议。实验结果验证了该方法的有效性和可行性。     

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.