基于无线传感器网络的水情监测数据传输的设计

提出一种将基于Zigbee的无线传感器网络应用于水环境检测的系统,该系统将Zigbee网络与GPRS无线通信网络结合,在传感器终端,采用ZigBee无线传输系统,能够将多样化的测量变量进行收集。然后通过ZigBee网络传送到协调器节点,然后协调器节点通过GPRS模块发送,经过GPRS协议与TCP／IP协议转换,完成与Internet的连接,监控中心可以通过Internet网络进行信号的收集,完成数据的远程采集与传输过程。     

一种基于3G技术的汽车监控与防盗系统的设计

本文利用现有移动GPRS网络,设计了一种新型汽车防盗报警系统。主要完成了汽车GPRS防盗报警系统的硬件电路设计。硬件以单片机STC89LE58RD为控制核心,采用GPS模块对汽车进行定位;采用串口摄像头模块进行拍照,实时监控车内动态;采用GPRS模块来实现系统的短信控制,发送图片、彩信和连接服务器等;采用液晶屏显示系统的运行状态信息。     

基于ARM/GPRS的宿舍信息发送系统

针对宿舍卫生和违规信息及时发送的需求,设计并实现了基于GPRS及Synchronization Services for ADO.NET同步技术的宿舍信息发送系统.该系统由服务器端、移动终端（采用基于ARM9的S3C2440微处理器）、GPRS网络和手机接收终端组成.ARM控制器通过串口向GPRS模块发送AT指令,将宿舍相关信息以短信形式发送至手机端,移动终端通过基于服务的同步技术实现与服务器端信息的同步.     

基于 Arduino Uno 平台的跌倒检测报警系统设计

利用基于 ATmega328P 单片机的 Arduino Uno 硬件平台、三轴加速度传感器 ADXL345和集成 GPS 导航技术的四频 GSM/GPRS 模块 SIM908,设计一种老年人跌倒检测报警系统。传感器采集的人体三轴加速度值通过 I2 C 总线传输到单片机进行处理,通过提取人体跌倒过程的特征值设计跌倒检测算法。检测出跌倒发生后,将跌倒位置通过短信发送出去进行报警。     

GPRS在两相流计量系统中的应用

针对有线或人工方式获取油气井口两相流数据存在现场布线复杂、获取数据实时性差等弊端,设计了基于GPRS方式的两相流计量系统。首先设计了UART接口转换电路,实现了井口数据处理单元与GPRS模块的通信;然后利用GPRS网络将各井口气液两相流数据实时传至数据中心上位机;最后,由数据中心上位机通过Internet接收并存储GPRS模块发送的数据,为生产管理、操作优化等提供直接的参考依据。理论上,凡是GPRS网络覆盖的范围都可通过该方式实现数据的传输与井口设备的管理,因此将GPRS应用到两相流计量系统中具有较好的推广性和广阔的应用前景。     

基于GPRS模块的彩信监控系统研究

在嵌入式环境下,设计开发一套基于GPRS模块的彩信监控系统。该系统综合运用多种嵌入式技术,集来电监听、图像采集、彩信封装、彩信发送等功能于一体,能够借助GPRS网络将监控现场的图像以彩信形式发送到用户手机。该系统扩充了监控的渠道,可以作为传统监控方式的有力补充。     

基于SIM300C的远程数据采集传输终端设计

提出一种由GPRS模块SIM300C和单片机AT89S52组成的远程数据采集和传输终端,介绍了系统的硬软件设计.该系统以单片机为主控制器,配合A/D转换电路、SIM300C模块及其外围电路,将传感器端采集的模拟电压或电流信号进行A/D转换,由单片机将相应的数字量打包,通过串口发送给SIM300C模块,SIM300C模块自动将要发送的数据打包成TCP/IP数据包,经GPRS无线通信网络发送给远端的服务器.实验结果表明,该系统运行稳定可靠、数据传输及时高效.     

基于ARM的网络远程家居视频监控系统

本文实现的监控系统,是将ARM服务端放在室内,传感器模块与摄像头放在家居内部重要区域和外部入口处.工作时如果传感器模块有信号输入,则通过摄像头获取图像.对存储的图像进行人脸识别的检测,如果检测到人脸则将图片存储并通过GPRS模块发送短信息到用户手机中,否则继续监视.此外用户可以通过互联网,与ARM服务端进行连接,通过网络可以查看家居内部重要区域和外部入口的情况.     

基于PC/104总线的数据采集系统设计与应用

数据采集是网络优化工作的重要任务。采用高工效的数据采集系统是解决问题的关键。用GPRS模块和PC／104总线实现的数据采集系统，稳定性和数据采集准确性高。由于体积小便于携带，系统可以采用先进网络优化数据采集的方式进行海量数据的接收与发送。     

基于嵌入式系统的钢轨温度采集系统

本文以嵌入式系统为控制核心,采用DS18820温度传感器进行钢轨温度多点采集,并使用GPRS通信模块与远程主机间的数据传输.该系统采用linux作为嵌入式操作系统,一方面利用多线程串口编程实现对DS18820的操作.进行实时温度采集;另一方面发给GPRS模块AT命令来控制温度数据向远程主机的发送与接收.远程主机将收到的数据进行汇总并以图表的形式表现出来.     

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.