线阵CCD非接触直径测量系统设计

为解决直径测量系统中存在的对工件有磨损、测量精度低、无法实现动态测量的问题,提出采用光电传感器件——电荷耦合器件线阵CCD光电检测方法,配合光学系统实现工件的非接触直径测量,满足了现代工业生产对直径测量系统提出的高精度、快速、非接触和实时反馈的需求。对线阵CCD的信号检测电路、调理电路及数据处理电路设计进行了研究,并进行了三种工件直径测量试验和误差分析。试验表明,该系统可对φ0.5 mm～φ30 mm的工件进行直径测量,测量精度为±5μm。     

基于FPGA的高精度薄膜宽度控制仪设计

为了达到薄膜生产指标,利用线阵电荷耦合器件(CCD)进行数据采集测量,反射式红外光电传感器作为反馈控制,并以现场可编程门阵列(FPGA)为核心控制器,设计出一种高精度薄膜宽度控制仪.该装置能在精确检测出生产薄膜的宽度同时,将其与生产要求的设定值进行比较,实现对充气开关进行控制.通过实验分析,该系统提高了整个生产过程的精度和可靠性.     

图象传感器动态

1.CCD图象传感器一种以电荷包的形式存贮和传输信息的,采用栅极阵列组成的MOS电容光电转换器件.按像素阵列形式分为线阵和面阵两种:线阵像素512～4096位,日本松下公司已有7500像素CCD图片传感器.面阵像素27万,线度8.1mm,有效传感面积4.8(H)mm×3.9(V)mm,     

CCD离散性对面积测量的影响

分析了电荷耦合器件(CCD)在空间和彩色(或灰度)的离散特性对面积测量的影响。通过统计特定区域的边界点和分析图像分割的效果,提出了一种评价CCD相关误差的方法。举例说明了图像分割方法对面积测量的影响很大,为此,讨论了正确使用CCD和提高面积测量精度的相应措施。     

线阵CCD精度靶图像触发算法设计

针对线阵CCD精度靶测量弹丸坐标时需要额外触发光幕发送触发信号来决定其何时开始采集的问题。在图像采集过程中,设计一种图像触发算法在接收线阵CCD相机的图像数据信号的同时自动检测弹丸并实时发送触发信号。通过研究弹丸图像的特性以及算法在FPGA上的硬件实现方法,利用当前采集到的图像对算法进行了实验验证。实验验证表明,该算法可有效识别弹丸信号,并能排除其它非弹丸信号的干扰。该算法对提高线阵CCD精度靶触发精度,精简线阵CCD精度靶结构具有十分重要的意义。     

CCD测量系统中基于自适应相关算法的动态目标跟踪

相关匹配是目标跟踪和模式识别的一种重要方法。介绍了CCD(电荷耦合器件)误差测量系统的光学原理针对该测量系统实际情况,提出了用相关算法实现目标位置的测量使用自适应相关匹配的方法,实现了对连续视频图像中动态目标的跟踪给出了实验结果,并对算法提出了改进的意见。     

基于线阵图像传感器的光纤光栅传感解调技术

对比线阵CCD，CMOS图像传感器和InGaAs图像传感器的原理、特点和性能，提出了基于InGaAs图像传感器的光纤光栅传感解调技术，并设计了基于线阵InGaAs图像传感器的光纤光栅传感解调系统，而且通过计算机控制单独对应力和温度变化进行了测量实验，得到了理想的结果．基于线阵InGaAs图像传感器的解调系统不但测量精度和分辨率很高，而且基本上实现了光纤光栅传感的智能化，为光纤光栅传感的工业化奠定了基础，具有很好的应用前景.     

基于DSP的线阵CCD高速精密测量系统的设计

传统的非接触线阵电荷耦合器件(CCD)测量系统,在速度和精度上都无法满足现代测量的要求。提出了以数字信号处理器(DSP)作为信号处理器,以复杂可编程逻辑器件(CPLD)作为时序发生器,结合高速ADC和先进先出(FIFO)存储器的新测量方法。重点介绍了CPLD配合DSP进行高效、灵活的采集控制部分。实验表明:该系统高效、稳定。     

基于线阵CCD的瓷砖尺寸在线检测系统的研究

设计了一种基于线阵电荷耦合器件(CCD)的瓷砖尺寸在线检测系统。利用线阵CCD像机对生产线上瓷砖进行扫描,通过适当的图像处理算法得到瓷砖的各项尺寸参数,判别产品是否符合质量要求,并将数据记入数据库以便进行统计分析。用VC++6.0开发了应用软件,用来控制系统的自动运行。实验证明:该系统重复性实验标准差为0.05mm,满足用户需求。     

KAI-08051系列CCD图像传感器

正安森美最近收购Truesense Imaging的电荷耦合器件(CCD)图像传感器阵容,提升工业应用的成像性能。新的KAI-08051图像传感器比上一代器件,提供更高光敏度、更低读取噪声及更高色彩精度,扩充800万像素图像捕获的商机,用于智能交通、监控、医疗成像及工业检测等要求极严的成像应用。KAI-08051图像传感器采用跟现有KAI-08050图像传感器一样的先进5.5μm像素架构、800万像素分辨率、15fps/s读取速率及4/3光学制式,但它使用了     

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