基于机器视觉的几何量精密测量系统

设计了一种基于机器视觉的几何量精密测量系统,该系统以万能工具显微镜为机械平台,运用机器视觉技术实现边界和线的计算机辅助对准,结合基于现场可编程（逻辑）门阵列（FPGA）和单片机的光栅测量技术实现了长度、圆、角度等几何量的精密测量,利用软件编程实现了测量数据的自动采集与处理,使用AutoCAD软件实现了零件尺寸的辅助测量。实验结果表明：该系统不仅保持了万能工具显微镜稳定性好、抗干扰性强等优点,且消除了人为误差,提高了测量效率,具有较高的重复性精度和测量精度。     

基于网络可生存性的网站保护系统

利用机器视觉技术建立圆形零件检测系统,采用简单高效的标定方法和亚像素技术实现对圆孔和圆形零件的非接触精密测量.圆孔和圆形的直径测量过程包括图像采集、图像分析处理和结果输出.其核心算法是系统校正、图像预处理、二值化和圆检测.实验结果证明,该系统实现了在线实时检测,其精度达0.01 mm,具有良好的应用前景.     

一种基于机器视觉的圆型零件检测技术

利用机器视觉技术建立圆形零件检测系统,采用简单高效的标定方法和亚像素技术实现对圆孔和圆形零件的非接触精密测量。圆孔和圆形的直径测量过程包括图像采集、图像分析处理和结果输出。其核心算法是系统校正、图像预处理、二值化和圆检测。实验结果证明,该系统实现了在线实时检测,其精度达0.01 mm,具有良好的应用前景。     

大尺寸复杂精冲零件智能测量系统的研究

对于传统精冲零件检测工艺普遍存在的人工抽检数量少、大尺寸检测困难、手工误差、复杂专用检具成本高且实时性差等所导致的综合效率低的问题,此文通过应用机器视觉、激光测距、精密数控、数据分析等技术开发了大尺寸复杂精冲零件智能测量系统,用于解决传统所检测面临的以上问题。此系统通过伺服运动控制一套由高分辨率工业相机、激光位置传感器和大理石载物台构成的三坐标检测平台,实现对大尺寸复杂精冲零件进行X-Y平面的尺寸精密测量和Z方向的高度或粗糙度精密测量。通过解析DXF图纸文件并应用改进的贪心算法来获取并优化检测路径,结合精密运动反馈拼接局部采样图像以提高机器视觉的检测精度。初步运行结果表明,系统测量600*600*8mm范围内复杂精冲件精度可达到±0.010mm。     

基于视觉的零件尺寸测量

针对在线实时检测和测量工业零件尺寸的问题,利用视觉技术建立一个的零件尺寸测量系统,采用简单高效的霍夫变换和亚像素技术实现对规则零件的非接触精密测量。尺寸测量过程包括图像采集、图像分析处理和结果输出。其核心算法是图像预处理、直线检测、圆检测和尺寸计算,详细介绍了利用霍夫变换进行直线和圆检测的方法。经研究可知,零件测量系统能实现工业零件的在线实时检测和尺寸测量,且具有速度快、实时性好、非接触、低成本等优点,具有良好的应用前景。     

基于机器视觉的二维高精度手机玻璃屏尺寸测量仪

为了满足现在制造业自动化生产中百分百的在线检测要求,设计了一种基于机器视觉的二维高精度手机玻璃屏尺寸测量仪器。该测量仪器引入二次滤波的方法对图像进行处理,采用光栅位移传感器对运动平台精密控制。利用多个CCD相机对玻璃屏进行测量,减少了单个CCD相机测量带来的随机误差,解决了导轨的直线度对测量结果的影响。然后对测量仪器的误差进行综合分析。经过一系列实验,结果表明,该仪器具有较高的测量重复性和测量精度,其测量精度可达5μm,具有很高的应用价值和广泛的应用前景。     

轴尖表面缺陷检测及尺寸测量系统研究

针对陀螺轴尖加工生产中对表面缺陷进行在线检测和关键几何尺寸进行高精度在线测量问题,设计并实现了基于显微机器视觉技术和快速图像处理技术的在线非接触检测测量系统,检测时,待检轴尖安装在精密位移台上,采用专用光源系统照明,通过显微成像系统成像;图像经采集,预处理、分割、特征提取,参数测量、结果统计等处理步骤,得到轴尖表面缺陷数量及几何尺寸.实测结果表明系统具有高效率、精度高、易于使用等特点,可有效解决轴尖表面缺陷检测及尺寸在线测量问题.     

基于机器视觉的密封件直径测量技术研究

针对机器视觉在工业实时测量技术上的应用前景,结合DSP处理技术,建立了密封件尺寸的测量系统。该系统提出了多于度阈值消噪及窗口精确定位的边缘检测方法,达到了密封尺寸实时,精密测量的目的。实验表明检测方案不仪实现了在线检测,而且精度高,具有良好的应用前景。     

光学坐标测量系统技术研究

光学坐标测量系统是建立在数字近景测量技术基础上的一种新型精密测量系统.它具有便携性好、精度高、测量范围大、受环境干扰小等优点,适合工业工程的现场测量.针对工业现场精密测量的需求,分析了立体视觉原理以及通用坐标测量的数学模型.目前系统的精度接近±0.1 mm/m,整个系统已初步成型,能够对实物工件进行测量,其测量精度、自动化程度令人满意.     

基于非接触精密视觉测量的硬盘磁头头偏测量系统

应用基于机器视觉的非接触测量技术对计算机硬盘磁头的头偏测量，不仅满足了磁头生产防污、防ESD的需要，而且实现了精密测量的需要；对测量数据的采集处理以及SPC实时监控，有效地实现了生产过程的控制和预报；与FIS系统的连接实现了生产数据的可追溯性，为生产管理现代化提供一个强有力的工具。系统已广泛应用于硬盘磁头生产线。     

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