基于混沌差分进化模糊聚类的多模型建模

针对模糊C-均值聚类算法存在对初始聚类中心敏感和聚类目标函数容易陷入局部最优的问题,提出了1种基于混沌差分进化模糊C-均值聚类的多模型建模方法.该方法采用混沌差分进化算法对模糊C-均值聚类的目标函数进行全局寻优,能有效的解决上述问题.将该方法应用于双酚A生产过程的质量指标软测量建模,仿真结果表明了该算法的有效性.     

一种C-均值聚类图像分割的模糊熵后处理方法

提出了一种结合C-均值聚类算法和模糊熵的图像分割方法，该方法先采用C均值聚类算法对含噪图像进行初步分割，再利用模糊熵准则作后续处理。该方法一方面能够继承C-均值聚类算法的优点，可以灵活地用在基于多特征和多阂值的图像分割中，另一方面充分考虑了图像的区域信息，利用模糊熵最小作为准则，对c均值聚类算法初步分割结果的错分类点作了进一步的处理，克服了C-均值聚类算法对噪声敏感的缺点。实验结果表明，本文方法在运算开销上只比C-均值聚类算法多4～6S，对于低信噪比的图像能够取得优于C-均值聚类算法的分割效果。     

利用自适应模糊椭球聚类实现点云分区

点云数据分区是逆向工程中重要而又难以解决的问题。采用自适应模糊椭球聚类算法实现逆向工程中的点云分区,利用凸组合在经典模糊聚类算法中加入平面聚类,凸组合系数利用启发技术根据平面大小自适应选择。避免传统分区算法中微分几何特征量的估算;利用竞争凝聚技术自动确定分区数目;分区结果便于后续几何参数精确提取。实验结果验证了该算法的有效性。     

基于智能优化算法的模糊软子空间聚类方法

为解决选定特征上的聚类问题和模糊C-均值聚类存在的初始值敏感、易陷入局部最优的问题,提出了一种基于改进萤火虫算法的模糊软子空间聚类方法。该方法在模糊C-均值聚类算法的基础上,采用基于数据可靠性的k-均值算法中特征权值的计算方法,并结合萤火虫算法的全局搜索能力对所有的特征子空间进行搜索;设计了一种目标函数来对聚类结果和子空间所包含的特征维进行评估,并利用目标函数改进了萤火虫算法的搜索公式。实验结果表明,该方法能有效地收敛于全局最优解,具有良好的聚类效果和抗噪性。     

基于核的非凸数据模糊K-均值聚类研究

将模糊K-均值聚类算法与核函数相结合,采用基于核的模糊K-均值聚类算法来进行聚类。核函数隐含地定义了一个非线性变换,将数据非线性映射到高维特征空间来增加数据的可分性。该算法能够解决模糊K-均值聚类算法对于非凸形状数据不能正确聚类的问题。     

基于k均值分区的流数据高效密度聚类算法

数据流聚类是数据流挖掘研究的一个重要内容,已有的数据流聚类算法大多采用k中心点(均值)方法对数据进行聚类,不能对数据分布不规则以及高维空间数据流进行有效聚类.论文提出一种基于k均值分区的流数据密度聚类算法,先对数据流进行分区做k均值聚类生成中间聚类结果(均值参考点集),随后对这些均值参考点进行密度聚类,理论分析和实验结果表明算法可以有效解决数据分布不规则以及高维空间数据流聚类问题,算法是有效可行的.     

模糊C均值聚类图像分割的改进遗传算法研究

基于模糊C均值（FCM）聚类算法,并利用遗传算法全局随机搜索的特点,提出了一种图像分割的改进遗传算法。该算法首先采用一种初值化算法确定合适的遗传算法的初始搜索范围,然后对遗传算法中的编码方式、交叉算子、变异算子等参数进行了一些适当改进,进而给出了该算法的理论推导和算法的具体实现步骤。该算法除了解决模糊C均值聚类算法在医学图像分割中容易陷入局部最优解的问题,而且采用的初值化算法比标准的遗传模糊C均值聚类算法能确定更合适的遗传算法的初始搜索范围,从而加速了遗传算法的收敛过程。实验表明,该方法相对于标准的遗传模糊C均值聚类算法,效果要好得多。     

基于核模糊聚类的多模型LSSVM回归建模

针对大规模数据采用单模型回归存在精度差和计算量较大的问题,提出一种基于核模糊聚类的多模型最小二乘支持向量回归建模方法.该方法首先使用基于条件正定核的模糊C均值聚类算法对数据集做出聚类划分;然后针对每个聚类做最小二乘支持向量回归估计;同时根据每个聚类内数据分布的特征,给出了一种简单的核参数选择方法.利用数值仿真实验进行非线性函数估计,实验结果表明了所提出的方法具有良好的精度和泛化能力.     

基于ELM的局部空间信息的模糊C均值聚类图像分割算法

极限学习机（Extreme learning machine, ELM）作为一种新技术具有在回归和分类中良好的泛化性能。局部空间信息的模糊C均值算法(Weighted fuzzy local information C-means, WFLICM)用邻域像素点的空间信息标记中心点的影响因子,增强了模糊C均值聚类算法的去噪声能力。基于极限学习机理论,对WFLICM进行改进优化,提出了基于ELM的局部空间信息的模糊C均值聚类图像分割算法(New kernel weighted fuzzy local information C-means based on ELM,ELM-NKWFLICM)。该方法基于ELM特征映射技术,将原始数据通过ELM特征映射技术映射到高维ELM隐空间中,再用改进的新核局部空间信息的模糊C均值聚类图像分割算法(New kernel weighted fuzzy local information C-means,NKWFLICM)进行聚类。 实验结果表明 ELM-NKWFLICM算法具有比WFLICM算法更强的去噪声能力,且很好地保留了原图像的细节,算法在处理复杂非线性数据时更高效, 同时克服了模糊聚类算法对模糊指数的敏感性问题。     

基于模糊等价矩阵的无线传感器聚类分区算法

基于模糊等价矩阵的聚类方法是模糊聚类中一种经典的分析方法。首次将其引入无线传感器节点分区的应 用中。该聚类分区算法通过计算节点间的Euclid距离、分析其相关性、形成模糊等价矩阵、进行节点分区,实现了对 该分区算法的应用设计。分析了其算法时间复杂度,并利用Matlab软件完成了算法仿真。仿真结果显示,该算法可 以根据其疏密程度的不同很好地将无线传感节点分成不同区域。     

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