基于VME总线的高速信号处理模块测试技术研究及应用

为解决某型号炮位侦察校射雷达中高速信号处理模块的测试,文中设计了基于VME总线的高速数字电路自动测试系统,该系统能模拟雷达工作环境,利用VME测试模块提供测试所需的光口、RapidIO等信号,测试结果通过VME主控器网口上报给系统管理平台;该系统成功应用于某型雷达高速信号处理模块的测试,可完成VME总线接口的测试;3路RapidIO信号的测试,Rapid IO信号传输速率为3.125Gbps;4路光纤通道的测试,光纤通道波特率为2Gbps;研究及实测结果表明该系统可解决基于VME总线的高速信号处理模块的测试。     

基于FPGA的VXI总线多功能模块设计

VXI总线多功能模块是某导弹自动驾驶仪VXI测试系统的关键模块,需要完成被测信号采集、特殊测试激励信号产生、频率测量和数字IO功能;文章首先简要介绍了模块的设计要求和总体设计;然后阐述了模块的各功能电路实现;接着重点论述了模块设计中采用扫描地址图谱实现多通道和量程动态切换、采用块传输实现VXI接口高速数据传输和采用RAM分时复用存储实现长时间连续数据采集等关键技术;应用这些技术研制的模块已应用于实际测试系统中,其性能良好,工作稳定;接口测试结果表明,模块的VXI接口设计极大地提高了数据传输速度。     

航空电子设备自动测试系统的软件架构设计

为检测和定位航空电子设备的故障,研究并设计了一种自动测试系统的软件架构;该架构包含了测试软件和测试数据库,测试数据库存储有测试被测设备的相关数据,测试软件将其作为输入,通过自动测试设备输送给被测设备,最终测试软件接收被测设备的输出并将其与测试数据库的预期数据相比较得出测试的结果;测试软件由手动测试模块、自动测试模块、系统自检测模块、测试记录读取和测试结果记录模块4个功能模块组成,自动测试和手动测试可以自由切换;该系统不仅能使用自动测试功能仿真被测设备的飞行环境,还可以使用手动测试功能具体定位分析故障,降低了设备的维护成本,缩短了维修时间。     

仪器接口平台的通用USB接口模块设计

为了使程控仪器可以接入不同接口的测试系统,在仪器接口平台上设计了一种仪用USB接口模块.该设计采用SCPI解析模块,使仪器在更换了USB接口模块后仍可方便地进入以USB总线构建的自动测试系统.测试结果表明,插入USB接口模块的仪器能够在以SCPI为控制命令的USB总线系统中稳定工作.     

基于ISP技术的自动测试系统信号处理研究

在VXI总线模块及GPIB仪器构成的自动测试系统中 ,利用ispLSI10 3 2实现了测试信号的动态分配和预处理 ,有效解决了测试平台对多种复杂被测对象的适配问题。     

基于CPCI总线的高速数据记录系统设计

针对地空信息传输系统中对下行链路高速数据记录的需求,设计了紧凑型外部设备互联（CPCI）总线的数据接收记录系统。介绍了系统的组成以及硬件模块设计和软件设计方法,对CPCI接口、本地总线接口以及接口速率适配电路给出了详细设计说明,并对CPCI总线能够达到的实际数据传输速率进行了理论分析。通过实际测试,数据接收系统满足任务需求。     

TRS-80Ⅰ微计算机IEC-IB接口的研制

IEC-IB(又称GP-IB或IEEE-488总线)是国际标准的通用接口总线系统,它在仪器仪表领域广泛应用,促进了第二代自动测试技术的迅速发展。近年来,已有越来越多的微计算机上配备了IEC-IB接口,使之能通过该标准接口系统控制多达十四台可程控仪器,灵活地组建各种自动测试系统,以实现可编程的连续测试、自动记录及数据处理。同时,由于接口系统采用了三线挂勾异步确认的通信方式,从而可在不同速度、不同系列的各种设备之间实现可靠的数据传输,这使IEC-IB接口不但可作为第二代自动测试系统的基础,而且有希     

并行自动测试系统硬件结构研究

为实现自动测试系统高效率和低成本,对并行自动测试系统的硬件结构进行了研究,提出了单处理器架构方式下的并行自动测试系统硬件结构;并具体对测试控制器、接口总线、仪器资源以及开关系统等各硬件模块的特点进行了研究,通过分析它们对并行测试的支持,明确了并行自动测试系统设计中的关键技术,可指导系统的实际开发。     

基于ISP技术在自动测试系统信号处理研究

在VXI总线模块及GPIB仪器构成的自动测试系统中，利用ispSI1032实现了测试信号的动态分配和预处理，有效解决了测试平台对多种复杂被测对象的适配问题。     

用PLD实现VXI自动测试系统测试接口设计

在基于VXI总线自动测试系统中，针对某大型电子装备多种被测组合综合测试问题，采用可编程逻辑器件（PLD）技术实现了灵活性强，可靠性高，成本低廉的VXI总线测试接口的设计，并通过测试信号的动态分配，动态上拉和动态预处理等方法，有效地解决 了测试平台对多种复杂被测对象的适配问题。     

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.