基于低速微处理器的高速数据采集系统

给出了一种高速脉冲信号采集系统的设计方案,仅利用普通微处理器即可实现对高速脉冲信号的数据采集,对高速A/D、高速缓存、逻辑控制以及数据通信接口等内容进行了讨论,提出了更为有效的同步控制方式.该设计方案电路简单,并可扩展为多通道同步数据采集系统.     

一种单检测器图像信号检测系统的设计

单检测器图像信号检测系统是可压缩成像系统的重要组成部分.利用光电倍增管作为光电传感器,并结合高速增强型51单片机编程控制A/D采样频率及串口,设计了单检测器图像信号检测系统.该系统可实现对高速变化的弱光信号进行检测、放大、滤波及传输等功能,并具有适应性好、结构简单、造价成本低等优点.     

基于LabVIEW的力觉检测系统

研究了手术过程中穿刺针与生物组织的相互作用力,对穿刺力进行了建模,搭建了生物软组织的力觉检测系统,检测系统由软、硬件2部分组成.其中,硬件平台采用了德国生产的高精度位移平台为穿刺针提供动力,利用压阻式力传感器进行力信号检测,并通过数据采集卡实时收集力信号.软件平台利用LabVIEW编程控制电机的运动和数据采集.利用平台进行了针穿刺实验,并利用MATLAB对实验数据进行了处理和分析,得出了穿刺力—位移曲线及其与影响因素的关系.     

电磁声裂纹检测虚拟仪器系统的研究

为了实现表面裂纹的非接触性检测,利用电磁声技术设计并制作了表面波传感器.解决了用于发射电磁声信号的高压窄脉冲串电路以及电磁声信号的高速采样电路这两项关键技术,构建了表面波电磁声裂纹检测虚拟仪器硬件系统,并利用虚拟仪器语言LabVIEW进行了相应的软件开发,采集并分析了电磁声遇到钢板表面裂纹后的回波信号.实验分析结果表明了系统用于裂纹检测的有效性.     

随机信号环形高速采集电路

为了对随机到来的信号进行不丢失的高速采集,提出了一种基于CPLD的随机信号环形高速采集卡的设计与实现;通过采用三套采集电路形成一个环形结构,可以对随机到来的信号进行不遗漏的高速采集,而且在采集过程中利用阈值的方法鉴别出有用信号,并舍弃了大量的冗余无用数据,从而只将有用数据以DMA的方式传于主机,便于进行信号的处理;电路设计简洁可靠,并给出了主要的逻辑电路示意图与主要部件说明;该系统已经应用在采集α核素的工程实践中.     

基于Lab VIEW的多通道木材声发射信号采集系统

为采集木材在长时间载荷作用下的声发射信号,设计了一种多通道的高速数据采集系统.首先,利用NI USB-6336高速采集卡和声发射传感器等硬件搭建4通道声发射信号硬件采集平台;其次,基于Lab VIEW设计人机界面及软件控制系统;最后,通过木材三点弯曲试验来验证该采集系统的效用.试验结果表明,该4通道的信号采集系统能有效地采集与自动存储木材在损伤过程中的声发射信号.作为一种木材声发射信号采集平台,该系统能够为木材声发射信号的采集与分析提供基本保障.     

面向结构健康的远程主动监测系统的设计

主要研究了基于PC机的面向结构健康主动监测系统的设计与实现.该系统是基于主动监测技术思想,利用PC机、高性能多功能I/O卡以及软件系统组合的形式实现的,具有输出任意波形的激励信号、高速连续数据采集、丰富多样的信号处理以及无线远程监测等功能.利用该系统并配以相应的外围设备,在PC机上即可方便地实现结构健康的在线实时监测.     

移动机器人多传感器测距系统研究与设计

设计了多传感器测距系统的硬件电路和相应的软件,采用高速运放和高速比较器减小信号传输延时,用双比较器整形电路消除回波前沿时间误差,利用FPGA进行高速计时,对声速进行温度补偿,并对其盲区采用红外线测距传感器和碰撞开关进行弥补,提高超声波测距精度.实验表明,在近距离测量范围内,该超声波测距方法可以达到毫米级.这种测量系统可以满足机器人避障与定位的实际需要.     

航空发动机高速振动智能检测监控系统设计与实现

设计了一种航空发动机高速振动智能检测监控系统,系统采用CPCI和模块化架构实现;针对航空发动机高速振动信号的特征,设计了基于DSP的信号采集与处理模块,实现同步采集多路振动信号并进行数据处理;利用FPGA和PowerPC设计信号智能检测与数据记录模块;通过多线程DSP软件实现振动数据的智能检测和监控;试验测试和验证结果表明,系统满足飞行安全实时检测监控工程应用的需求。     

高速脉冲信号源的设计与实现

高速脉冲信号源是数据采集系统的重要组成部分,常用于系统的自检与测试中.根据实际要求,提出了高速运放调理和高速电子开关两种方案.分别对高速运放、信号幅值调理、驱动电路和高速电子开关的选择进行了研究,给出了具体的硬件电路设计.并结合相关理论,分析了信号在传输过程中出现的反射现象,提出了符合要求的解决方案.此高速脉冲信号源已成功应用于某采集设备的自检和测试中,效果良好.     

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.     

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.     

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.     

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.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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