基于MLX90614的非接触式体温测量系统设计

根据辐射测温原理设计制作温度测量系统。采用Melexis公司的MLX90614非接触测量的红外温度传感器,通过SMBus协议与AT89S51单片机通讯,并通过单片机系统驱动液晶显示模块显示,实现了非接触的温度测量,测量精度可达到±0.1℃,可广泛地运用于医学、化工等领域。     

基于MSP430的低功耗无线温度测量技术研究

以低功耗为出发点,系统选用MSP430G2xx系列超低功耗单片机作为核心控制器,采集1-Wire器件DS18B20数字温度传感器的温度,并通过单片射频收发芯片nRF2401将温度数据无线发送给接收系统。整个系统均采用低功耗芯片设计,有效降低了无线温度测量系统的功耗,测量温度范围从-40℃到125℃,最高精度可达0.5℃,可靠无线数据传输距离50米以上。     

MSP430的低功耗特性在蓝牙产品中的应用

在介绍MSP430F447单片机和LBMx-2002蓝牙模块的特点和功能的基础上,着重介绍了单片机和蓝牙系统的各种低功耗工作特性,并充分利用其节能特性实现MSP430F447单片机在便携式蓝牙产品中的应用。     

智能定位便携式测温仪

设计一种基于MSP430单片机的应用于电力设备测温的便携式红外测温仪。采用射频识别(RFID)技术对测量地点进行定位。基于非接触、远距的测量特点,设计采用红外测温传感器MLX90614测量目标温度,同时,利用环境温度传感器采集环境温度,依据红外测温原理对目标温度进行高精度修正。系统内置SD2200时间模块,准确记录测量时间。系统内置USB读写模块,将位置信息、目标温度、环境温度、修正温度、测量时间记录在内置SD卡内,方便导入电脑并生成报表。该便携式测温仪从根本上杜绝电力巡检中漏测、错记的问题,生成报表方便查询,大大提高工作效率。     

具有无线收发功能的可燃气体检测装置

从TGS813传感器工作原理出发,介绍了可燃气体检测的基本原理.采用低功耗的MSP430F149单片机为主控制器,TGS813传感器实现信号采集,并用NRF905芯片设计了无线数据传输部分.软件部分主要对测量值所受温度的影响进行了修正,提高了测量精度,并控制通信模块实现无线数据传输.实验表明:该装置精度高于±5%F.S,并可实现空旷地带330m的无线传输,可以满足大部分工业需要.     

基于MLX90615和MSP430的红外测温系统的设计

红外测温技术由于方便、快速、准确而被广泛应用于航空、医学等很多领域.介绍了一种非接触式测温方案,采用MLX90615红外温度传感器和MSP430F149单片机来实现.单片机通过SMbus方式与MLX90615进行通信,将读出的温度数据进行处理,之后驱动LCD模块显示测量温度.发射率可根据测量目标进行设置,用以提高测温仪...     

基于MSP430单片机的高压电力设备温度在线监测系统

介绍了基于MSP430单片机的高压电力设备温度在线监测系统。系统通过两个模块实现对高压电力设备温度的在线监测，防止电力系统安全事故的发生。系统具有超低功耗、性能稳定、测量精度高等特点，应用较为广泛。     

基于MSP430F149的无线传感器网络节点设计

本文设计了以超低功耗单片机MSP430F149为核心,结合外围传感器和无线收发模块的传感器网络节点.MSP430F149控制传感器采集环境中的温度、振动数据,并对原始数据进行初步处理,再由无线收发模块将数据发送给相邻节点.数据经传感器网络节点的一级级转发最终发送回主机,实现对环境的监测.     

嵌入式无线传感器网络节点的设计

介绍了以超低功耗单片机MSP430F149为核心，结合外围传感器和无线收发模块的传感器网络节点的软、硬件设计与实现方案，MSP430F149控制传感器采集环境中的温度、湿度和振动数据，并对原始数据进行初步处理，再由无线收发模块将数据发送给相邻节点，一级级转发最终发送回服务器，实现对环境的监测。     

一种红外测温系统的设计与实现

针对一些不适合进行接触式测温的场合,设计了一种非接触式红外测温系统,采用红外热电堆传感器TMP006和单片机MSP430来实现.其中单片机通过I2C总线与TMP006通信,并将读出的数据进行处理,然后驱动LCD模块显示测得温度,同时通过蓝牙串口模块将测得的温度数据传送到手机等移动端应用软件上,实现温度的远距离读取.实验结果表明,该系统操作方便,响应速度快,测量精度较高,能够较好地用于非接触式温度测量.     

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.