基于MC13192的无线传感器网络节点设计

ZigBee技术是一种新兴的无线通信技术,以低速率、低功耗、短距离而著称,是目前研究的热门技术.本文简要介绍了ZigBee技术体系结构与特点,以及基于ZigBee技术的无线传感器网络的主要优势;重点介绍了一种采用符合ZigBee技术的射频芯片MC13192实现无线传感器网络节点的设计方案,并对系统硬件接口电路与无线通信软件流程作了说明.     

ZigBee无线传感器网络在点餐系统中的应用

介绍了ZigBee技术的特点,同时阐述了信息化餐饮管理的三种模式,提出了一种基于ZigBee无线传感器网络的点餐系统设计方案。该方案给出了点餐系统的具体管理模式,对系统各部分的软、硬件进行了设计,并着重阐述了无线传感器组网的过程。研究表明,该无线传感器网络实现了网络组建和数据通信的功能。基于ZigBee技术的点餐系统具有低功耗,低成本,无线化,通信距离远等特点。     

基于ZigBee的无线网络系统的设计与实现

为了满足无线近距离内感知、采集和处理信息,设计了一种符合ZigBee规范的无线星型网络系统.简要介绍了ZigBee技术及其特点,分析了ZigBee无线通信协议,并采用了Chipcon公司的CC2430芯片和带有定位引擎的CC2431芯片,实现了短距离范围内的无线定位.在此基础上,对无线网络系统的硬件进行了研究与设计,软件上进行了无线通信应用程序的开发,并通过图形显示软件对设计的网络系统进行实时定位显示.此网络系统满足了无线近距离通信的要求,同时对符合ZigBee规范的无线网络系统的应用前景进行了展望.     

ZigBee技术的硬件实现模式分析

ZigBee是一种新兴的短距离、低成本和低功耗的无线通信技术，支持嵌入式应用，目标是填补低速率无线应用市场的空白。本文介绍了ZigBee技术的体系结构及特点，并结合Chipcon公司生产的符合ZigBee标准的CC2420无线射频收发芯片，分析了其硬件实现模式。     

基于ZigBee的传感器网络在石化工业中的应用探讨

随着计算机技术、通信技术与网络技术的飞速发展,无线传感器网络受到了国际上的广泛关注.在概述了无线传感器网络的优势及其在石化领域的应用前景基础上,对ZigBee及现有无线通信技术的特性进行了分析.重点介绍了ZigBee技术协议和特点,并利用目前市场上所能提供的器件和开发套件设计出了一种应用于石化工业中的传感器网络方案.最后,通过实验验证了方案的正确性和可行性.     

基于ZigBee技术的智能家居系统研究与设计

分析了ZigBee无线通信技术和家庭网络的特点,介绍了一种利用ZigBee技术无线组网的智能家居系统,重点阐述了ZigBee的组网方式、节点之间自动控制的实现、数据的采集和传输。     

基于ZigBee技术的无线电能抄表网络节点的设计

ZigBee无线网络技术具有低功耗、低成本和短延时等优势,是目前世界上发展最快,市场前景最广阔的新技术之一。本文针对ZigBee技术特点,在ZigBee协议基础之上,采用TI公司ZigBee解决方案的高集成度、高性能SOC片上系统芯片CC2430作为控制器和无线收发器,电能表的设计采用电能计量芯片ATT7022B,设计了一种基于ZigBee技术的无线电能抄表网络节点的硬件系统方案,并对网络节点与协调器之间的无线收发进行了实际验证,协调器可以对节点进行无线抄表。结果表明:电能计量和ZigBee的点对点无线传输的正确性和可靠性。     

基于ZigBee技术的矿井人员定位系统的设计

针对ZigBee技术的特点和优势,结合煤矿井下的生产特点,文章提出了一种基于ZigBee技术的矿井人员定位系统的设计方案,介绍了ZigBee设备在煤矿井下的无线通信组网方式,详细阐述了ZigBee通信协议包在ZigBee RFD节点模块和ZigBee FFD节点模块之间的无线数据传输方式,并给出了井下人员定位原理及其具体的实现过程,以及管理软件系统结构框图。     

基于无线传感器网络的湿地水环境数据视频监测系统

对湿地水环境监测技术的研究现状与进展进行了概述.提出了基于无线传感器网络的实时数据视频监测系统的设计方案,介绍了系统架构,并详述了基于ZigBee无线技术的数据监测节点、基于ZigBee无线技术和CDMA无线技术的数据视频基站、水环境数据和视频监测中心等各个部分的功能特点及设计方法.     

基于ZIGBEE技术的安防系统设计与实现

本文对无线网络枝术ZigBee及其相关标准IEEE802.15.4进行了性能分析和研究.介绍了ZigBee无线传感器网络的优势.结合ZigBee和GSM技术设计了一种无线安防系统,给出系统的设计方案.     

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.