基于FPGA的高速模拟量采集系统设计

本文介绍了以FPGA为平台的高速模拟量采集系统，重点说明了FPGA高速模拟量采集逻辑模块设计。针对机载系统中存在多种类多数量的模拟量采集需求，设计一种通用的高速模拟量采集系统，在FPGA中将采集值计算为浮点数，处理器软件中仅需进行数据转换即可得到采集结果。利用FPGA并行采集、并行计算可实现高速采集。以16路模拟量采集进行了仿真和试验验证。     

基于正则表达式的Web资源采集系统的设计与实现

介绍了Web资源类型和采集策略中的对采集质量有影响的因素。设计实现了一套基于正则表达式的Web资源采集系统,系统具有灵活的可扩展性和可配置性,重点介绍了采集系统结构和采集技术。     

基于正则表达式的Web资源采集系统的设计与实现

介绍了Web资源类型和采集策略中的对采集质量有影响的因素。设计实现了一套基于正则表达式的Web资源采集系统,系统具有灵活的可扩展性和可配置性,重点介绍了采集系统结构和采集技术。     

机械密封端面微小形变图像采集系统设计

在机械密封数字散斑微小形变测量系统中,图像采集是必不可少的一部分;使用Matrox Solios ecl/xcl图像采集卡、BaslerA504KCCD相机及自主开发的外触发采集光电转速同步器构建了采集系统的硬件架构;基于VC++2008调用MIL9.0库函数开发了图像采集软件系统;为了满足不同的采集要求,该采集系统设置了静态及外触发两种采集方案;介绍了图采卡的采集模式、相机曝光的触发方式及如何配置DCF文件。给出了在VC++2008的MFC应用程序解决方案中采集软件的设计流程;给出了MIL对象的定义、初始化以及外触发采集的主要源代码;应用表明,该图像采集系统能很好地采集并保存完整清晰的图像,为后续的图像处理、分析工作奠定了基础。     

基于FPGA的高速采集系统设计与实现

给出了高速采集系统的实现架构及控制原理,并在分析数据采集系统现状的基础上,针对高速采集系统存在的采集和传输速度、资源利用不合理以及硬件成本偏高等问题,给出了一种共享总线、同步采集、分时读取的方法。实践表明,采用该方法提高了系统的采集和传输速度,实现了对多通道、高分辨率并行A/D同步采集的有效控制,节省了FPGA系统资源,降低了硬件成本。     

基于OpenCV的双幅图像采集系统设计与实现

数字图像采集是图像处理技术应用中的基础,传统的图像采集系统一般只针对单幅图像采集,而且随着技术的发展,在许多实际应用中要求采集双幅图像.论文先介绍了图像采集相关原理,并对双幅图像采集系统进行了设计,然后详细介绍了双幅图像采集开发的主要步骤,最后采用Opencv技术开发双幅图像采集系统.实验结果显示,该系统具有采集速度快,系统易读性和可移植性强的特点,很好地满足双幅图像采集的要求.     

X光信号采集模块的设计与实现

本文设计了一种X光信号采集模块。在给出了信号采集模块设计方案基础上,设计了信号采集模块的硬件电路,包括信号调理电路、A/D转换电路,制作了电路板,并进行了实验与调试。本文所设计的信号采集模块能够实现X光信号的高速采集功能。该高速X光信号采集模块能够用于物流中货物和生产线中高速运行产品的无损检测,具有较高的应用价值。     

电力变压器局部放电信号采集系统设计

叙述了电力变压器局部放电信号的特点以及该信号的采集方法，提供了一种避免强电磁干扰，提高采集质量的方法，并给出了一种放电信号同步采集设计方案。文中还研究了非连续放电信号采集的启动方法。     

生物神经信号采集与模式识别

研究并实现了生物神经信号实时采集和分析系统,其集生物信号采集、模式识别、反馈控制于一体;设计了交替缓冲方法实现采集和存储的数据共享;提出了多速率压缩算法以实时分析采集信号的特征;给出了生物神经信号的模式识别的准则。该系统已在生物神经信号采集中得到实际应用。     

一种面向主动安全的动态采集策略设计与实现

面向分布式集群主动安全,为降低信息冗余的同时保证精度,设计了一种计算机资源状态信息动态采集策略。通过对集群中的10种状态信息(共计164项)进行分析,研究了其阈值与系统状态是否正常之间存在的关系,通过筛选、分组实现动态采集策略的设计。实现对状态信息的采集,保证了对资源的低占用,实现了动态采集策略的即时生效。通过故障注入方法模拟系统状态异常时的运行状态,通过对比采集结果的数据量大小,衡量动态采集策略,降低信息冗余的有效性。实验结果表明,该采集策略有效地降低了信息冗余并保证了采集精度。     

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.     

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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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