先进飞机自动配电系统的设计基础研究

电气负载管理中心是实现航空电气负载控制和管理自动化的重要组成部分,其主要任务是通过机载总线和供电系统处理机交换控制和状态信息,以实现对先进飞机二次配电中心的分布式电力汇流条和固态功率控制器的监测与控制;文章根据电气负载管理中心的功能需求与VxWorks的内在需求,在硬件上进行模块设计,在软件上划分了应用任务并分配了任务优先级,此系统可以大大提高飞机配电系统的可靠性和可维护性.     

基于虚拟仪器的无人机舵面负载模拟器

设计与实现了一种基于虚拟仪器的无人机舵面负载模拟器.针对无人机舵面负截模拟器的测试需求,给出了基于虚拟仪器的无人机舵面负载模拟器的基本功能、硬件配置、试验平台搭建、软件设计和系统测试结果.系统的测试结果很好地验证了系统设计的有效性.     

机场特种车辆训练模拟器控制系统设计

介绍了机场特种车辆训练模拟器的控制系统,其中包括液压驱动控制系统和电气控制系统。液压驱动控制系统为模拟舱门的侧向伸缩与缓冲和支撑臂的打开与收回提供液压源和液压控制,主要控制部分包括:机场特种车辆训练模拟器支撑臂、支撑柱、支撑臂松开锁紧装置和客货舱体的液压驱动控制。电气控制系统为机场特种车辆训练模拟器提供动力电源和实现电气控制,包括主电源配电系统、主控制器、电气控制执行元件、到位检测元件等部分。该液压驱动控制系统和电气控制系统满足可靠性、安全性和室外工作环境的要求。     

一种基于工控机的飞控系统模拟器

本文提出了一种基于工业控制计算机开发的某型无人机飞控系统模拟器,详细描述了系统的功能及结构配置,提出了硬件实现方案,并给出了软件模块功能、流程以及实时性的解决方法。该模拟器可用于无人机系统先期设计验证及系统联试。     

某型雷达模拟器PPI显示的设计与仿真

为了实现机载雷达训练模拟器人机交互界面,对雷达模拟器PPI显示进行设计.为了获取更逼真的实时显示,首先对雷达模拟器PPI显示的构成进行分析,设计字符显示模块和图形显示模块,然后介绍了模拟器中PPI显示的关键技术问题及解决途径,包括雷达点迹显示、杂波目标显示以及扇扫显示,采用颜色等级亮度不同来显示扫描更新的点迹,用具有某种特定概率密度和自相关函数产生随机数方法来近似仿真杂波目标显示.将改进方法应用于某型机载雷达训练模拟器中,取得了良好效果.     

ArmSim全系统模拟器的设计与实现

模拟器作为嵌入式系统研究的基础研发工具,可辅助系统体系结构调优、软硬件协同设计.本文实现了具有良好配置性及可扩展性的ArmSim模拟器,该模拟器是针对ARM处理器的全系统模拟器,可在其上运行和调试ARM应用级和系统级的目标程序.本文详细描述ArmSim的设计与实现细节.     

基于蓝牙通信的EWIS线路故障模拟装置的设计

目前,民航业现阶段的电气线路互联系统(Electrical Wiring Interconnection Systems,EWIS)电路仿真模块采用的仍是手动继电器连接的方法,在实际应用中反映出操作不便、效率低、易出错等问题,同时会衍生出一系列如线路故障单一、故障检修时效差等飞机飞行安全性问题。针对上述问题,文章设计了一套基于蓝牙通信协议的EWIS线路故障模拟系统。该系统中包含的蓝牙通信协议,可以通过手机或个人计算机(Personal Computer,PC)端App发出不同的执行命令,控制单片机模块中特定的继电器动作,从而改变训练盒中单线路与多线路短路或断路的故障配置与检修。所提出的设计方案可有效增加航空EWIS教具的故障种类,对航空机务的故障检修培训有一定的积极作用。     

飞行训练模拟器设计

介绍了飞行训练模拟器的基本组成和设计方法。采用CAN总线技术实现了飞行模拟器座舱系统,利用Di-rectSound技术实现了音响系统,选用Vega Prime、CTS和Creator开发了视景系统。应用实践证明,该模拟器性能稳定,操作、维护方便,能够适应部队模拟飞行训练的需要。     

卫星负载运动模拟器控制电路设计

分析了ADI公司推出的单片机ADμC842和ALTERA公司的FPGA芯片EP1C3T144C6的功能特点;根据卫星负载运动模拟器的工作特点和控制要求,设计了基于ADμC842和FPGA的卫星负载运动模拟器控制电路。该电路结合单片机的控制能力和FPGA的逻辑处理能力,很好地满足了卫星负载运动模拟器控制系统的控制要求。实际应用结果表明,该控制电路实现了卫星负载运动模拟器的实时控制,增强了系统的可靠性和可扩展性,取得了很好的控制效果。     

自制振动模块及其应用

电子模块实际是特殊功能的电子或电气线路的组合体,它具有功能专一性,使用简洁性,外型微小一体化和用途广泛性等特点。本文介绍的振动模块不同于一类振动传感器(如水银开关,滚球振动传感器),它实际是将振动传感器与电子电路搭配的新型电子器件。以下暂给模块取名为MO01。模块MO01主要特点:克服了振动传感器的过敏或检缓的极端现象,延时电路可外部调控,以适应多种控制需要;具有较大的控制功率,能直接驱动继电器、发光LED、可控硅等常规负载。模块主要参数:供电电压3～18V;输出负载能力<100mA。     

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.