基于共生矩阵和颜色特征的墙地砖缺陷自动检测的研究

该文提出了一种用于墙地砖自动缺陷检测的新算法,该算法综合了颜色的空间分布信息和比例分布信息,应用共生矩阵纹理特征与颜色统计特征构造一个判断矢量,能对复杂纹理的多色墙地砖进行各种缺陷检测,实验证明该算法是有效的。     

基于改进马尔可夫随机场的钢轨缺陷分割

为提高钢轨缺陷分割对噪声的鲁棒性,提出一种基于改进马尔可夫随机场(MRF)的钢轨缺陷分割方法。利用背景差分法对灰度进行预处理,消除灰度分布不均的干扰。对模糊if-then规则的前提部分采用马尔可夫随机场来利用图像中的空间约束,结果部分指定像素距离图算法,通过使用马尔可夫随机场(MRF)在相邻像素图像之间并入局部空间信息,推导出新的自适应模糊集和MRF相结合的钢轨表面缺陷自动分割方法。建立标准的FCM、GMM和该方法的钢轨缺陷分割对比实验,验证了算法的有效性和优越性。     

实时射线检测焊缝缺陷的模糊神经网络识别方法

通过对射线检测焊缝缺陷特征的分析，提出了用于焊缝缺陷识别的模糊神经网络模型，介绍了隶属度的构造和BP网络学习算法。实验表明，该方法对于焊缝缺陷的识别是有效的。     

FPGA实现UART核心功能算法的时序缺陷

简述采用HDL语言在FPGA内实现UART核心功能的一种算法,分析ARM与FPGA之间进行异步串行通信实验时FPGA接收的数据的错误和实现UART核心功能的算法,得出波特率和FPGA系统时钟存在误差导致该算法存在时序缺陷,找到了存在时序缺陷存在的原因并提出了解决的方法,通过实验验证了方法的正确性。     

基于复杂网络分析的软件高危缺陷评估方法

为了评估软件缺陷的风险,提出了一种基于复杂网络分析的软件缺陷评估方法。该方法首先用一个网络模型表达程序实体之间的关系,将源代码中的方法抽象为节点,方法间的调用关系抽象为有向边,以此构造程序源代码网络;然后分别用介数算法和PageRank算法计算造成软件缺陷的方法节点在源代码全局网络中的地位,由此评估缺陷的风险高低。实验结果表明,该方法在评估内部高危缺陷时有较好的效果,有助于提高软件开发维护人员对一些隐蔽高危缺陷的关注度,进而为后续修复缺陷与软件演化提供有益的线索。     

无线认知网络中一种团划分的频谱感知算法

提出了一种基于节点之间竞争关系以及感知代价的分布式频谱感知算法.该算法基于分布式最小团划分理论,将节点划分至不同的团中,然后再根据团的结构来计算最优频谱感知分配.该算法的时间复杂度仅为O(N2+M×N),其中,N为网络中节点数,M为信道数目.大量的仿真实验结果表明,该算法能够有效地提高网络性能.     

基于关联规则的ICAI系统中矫正学习路径规划

教学系统的学习路径规划是其智能化的重要标志。该文针对学习结果中未达到学习目标要求的缺陷知识点，运用数据挖掘的情况Apriori算法，在大型知识库中发现并运用缺陷知识点之间的相关性，给出了矫正学习路径的智能规划算法，提高ICAI系统的因材施教 能力。     

有效的纹理缺陷检测方法：子带共现矩阵法*

提出一种结合小波变换与共现矩阵用于纺织品图像缺陷检测的方法.首先将灰度图像分解成子带;然后将纹理图像分割成互不重叠的子窗口,提取共现特征;最后用无缺陷样品训练的Mahalanobis分类器将每一子窗口划分为缺陷的和无缺陷的.应用该算法进行实际工厂环境中的纺织品缺陷检测.实验结果表明,集中处理具有强判决能力的某一频带提高了检测性能,也改善了计算效率.     

基于边界特征配准的墙地砖缺陷检测研究

该文结合radon变换和几何推理,研究了基于墙地砖边界的用于规则图案表面缺陷检测的图像配准方法。实验证明该算法简单快捷,能检测出墙地砖的一般常见缺陷。     

基于缺陷分类和缺陷预测的软件缺陷预防

为降低软件缺陷率,对现有的缺陷预测模型进行了优化,同时引入正交缺陷分类方法,并对该方法加以改进,使其能够支持缺陷的原因分析,将缺陷预测与改进的正交缺陷分类方法结合起来,形成一套软件缺陷预防流程并应用在实际项目中.实验结果表明,该成果可以在软件生命周期的各个阶段有效预防缺陷,最大限度地提高软件质量.     

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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