基于LabVIEW的数据采集系统的实现

阐述了开放式虚拟仪器平台LabVIEW的特点,并介绍了在该平台上使用普通数据采集卡进行数据采集的动态连接库的设计方法。在此基础上开发了一个由计算机控制的数据采集系统,并对电动汽车电机电枢电流、车轮速度以及车身速度等信号进行了实际采集。实验证明采用这种方法省去了复杂的语言编程,缩短了软件的开发时间,简化了开发过程,同时也增加了应用的灵活性。     

基于PCI数据采集卡的虚拟采集系统设计

阐述了开放式虚拟仪器平台LabVIEW的特点,介绍了PCI总线技术。利用图形化编程语言LabVIEW的虚拟仪器和动态特性,在计算机上构成用户界面动态显示和交互,使用LabVIEW动态链接库,调用板卡函数开发出了一个由计算机控制的FIFO半满式32路数字量采集系统,并且进行了软件可行性的测试。数据采集卡配合虚拟仪器中的LabVIEW编程,就能完成数据采集过程。实验证明,采用这种方法省去了复杂的语言编程,缩短了软件的开发时间,简化了开发过程,同时也增加了应用的灵活性。     

基于PC/104的数据采集系统设计

随着计算机技术及虚拟仪器技术的迅速发展，虚拟仪器正逐渐成为测试领域的发展方向。介绍了一种基于虚拟仪器技术开发环境LabVIEW语言和PC／104总线标准的数据采集模块构建的数据采集系统。详细阐述了Diamond—MM-16-AT动态链接库的编写，并开发了使用LabVIEW中的调用库函数CLF来驱动Diamond—MM-16-AT的程序，从而实现对数据采集模块的驱动，完成数据采集工作。实验结果表明，该系统能够有效地实现对信号的高速数据采集和实时图形显示。     

基于PCI总线的计算机组件自动测试系统设计

针对某型计算机信息处理板性能自动化测试要求，对其各种性能参数的自动化测试方法进行了深入研究，并利用LabVIEW虚拟仪器开发平台和仪器总线技术，建立了基于工业控制计算机和数据采集卡的开放式自动测试系统；该系统充分利用了信息处理板DSP芯片的强大运算能力，确保系统具有很快的测试速度和很高的测试精度；自动测试系统的成功应用，大大提高了对信息处理板的测试水平。     

基于LabVIEW的结构实验数据采集系统的应用

本介绍了利用虚拟仪器软件开发环境LabVIEW开发结构实验系统。并利用该系统对某钢构件的性能进行测试．实现对力和位移信号的实时数据采集。     

基于PCI总线多用虚拟仪器的开发与集成

利用LabVIEW虚拟仪器设计平台与PCI总线数据采集卡构建了一个虚拟仪器系统。本文详细地介绍了利用美国NI公司的LabVIEW图形化编程语言,进行虚拟仪器的开发,包括系统硬件和软件的设计。该仪器具有数据采集,波形显示,参数测量,频谱分析,数据存储,频率特性测试等多种功能。     

基于C8051F020单片机的虚拟仪器测试系统

研制了一种新型的虚拟仪器液压与气动测试系统，该系统由数据采集子系统和数据处理分析子系统两部分组成。数据采集子系统以C8051F020单片机为核心，数据通讯处理分析子系统以VB6．0和MATLAB7．O为平台设计。两子系统通过标准RS-232C串口进行数据通讯。该虚拟仪器数据采集分析系统摆脱了虚拟仪器开发对LabVIEW等软件平台的依赖和PCI总线等数据采集板卡的束缚。     

基于虚拟仪器实现结构声发射检测的研究

讨论了一种基于虚拟仪器的结构声发射检测系统的设计和实现。使用虚拟仪器开发平台LabVIEW和数据采集卡,利用Internet进行数据通讯,结合MATLAB强大的信号处理能力进行混合编程,对数据采用多种信号处理和分析方法,获取声发射信号在时频域的各种特性,并对损伤进行定位,建立了一个灵活可扩展的结构声发射分析定位系统。试验证明这种基于虚拟仪器的结构声发射检测系统使用方便快捷,信号分析丰富,定位更精确。     

基于LabVIEW的信号处理与分析系统设计

LabVIEW作为著名的虚拟仪器开发平台,数据采集、信号处理与分析是其强项与优势,本文以混合了白噪声的信号的处理与分析为例,构建了一个基于LabVIEW的信号处理与分析系统。     

网络化水电机组振动监测和故障诊断系统

针对水电机组振动监测与故障诊断的多样性和复杂性,运用PXI总线仪器和LabVIEW可视化的虚拟仪器系统开发平台,设计并组建网络化水电机组在线振动监测和故障诊断系统.该系统实现了水电机组振动信号的数据采集、数据处理和分析,并能通过网络进行故障诊断.实际应用证明这种基于虚拟仪器技术的网络化水电机组在线振动监测和故障诊断系统具有很强的灵活性和可扩展性.     

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.