复杂网络的局部社团结构挖掘算法

挖掘复杂网络的社团结构对研究复杂系统具有重要的理论和实践意义.其中,相较于全局社团,局部社团的挖掘难度更大,相关文献更少.现有的局部社团挖掘算法大都精度较低、稳定性较差.本文提出了一个有效的局部社团挖掘算法,称为内外夹推法（Shell interception and core expansion,SICE）.算法有两个创新之处:1）将节点相似度模型引入到局部社团挖掘算法中（节点相似度模型在局部社团挖掘中较难应用）,并提出了“一次一个子图”的社团扩展模式;2）提出了一种“内外夹推”的思想.这两个创新使SICE算法摆脱了缺乏网络全局信息的困扰,并解决了以往算法的一个致命缺陷,从而使算法具有很高的精度和稳定性.通过理论分析和实验比较,证明SICE算法要远好于当前的同类算法,甚至不逊色于性能较好的全局社团挖掘算法.     

基于节点内聚系数的局部社团发现算法

为了能够快速有效地发现复杂网络中的局部社团,提出一种基于节点内聚系数的局部社团发现算法。该算法选取最大度节点作为起始社团,不断搜索其邻居节点,将满足条件的节点不断加入起始社团从而形成新的社团。在不同规模的真实网络数据集和人工合成数据集上进行实验,并与其他三种局部社团发现算法进行社团划分效果的对比。实验结果表明,该算法能够在较短的运行时间内保持较高模块度来识别复杂网络中的局部社团结构,更适合于大规模复杂网络的社团结构挖掘。     

基于权重信息挖掘社会网络中的隐含社团

社团结构是一种普遍存在于各类真实网络中的结构特性.挖掘网络的社团结构对于理解网络的功能与行为有着重要作用.然而,现有的各种社团挖掘算法仅仅基于网络拓扑结构信息,而忽视了蕴涵于真实社会网络边权信息中丰富的语义信息.目前普遍使用的基于模块性最大化的社团挖掘算法倾向于将小社团合并,这使得语义上丰富的小社团容易湮灭于基于拓扑结构信息所挖掘出的大社团中.而挖掘出这些隐含于大社团中的有着丰富语义内涵的小社团对于加深社会网络语义层面的理解有着重要作用.为此,提出一个接近线性复杂度的有权网络社团挖掘算法.通过充分利用权重信息,算法可以将社会网络划分为富含语义信息的粒度较细且相对较小的隐含社团.通过对基于DBLP作者合作网络的实证分析,证实了新算法的有效性和高效性.     

一个基于多维特征向量的复杂网络社团结构发现算法

作为复杂网络重要特性之一的社团结构在大量现实的大规模复杂系统研究中占有重要的一席地位.论文在研究现有的社团发现算法基础上,提出了一种基于多维特征向量的复杂网络社团结构发现算法,实验证明,该算法能够有效的发现复杂网络中的社团结构,对于进一步进行复杂网络上的信息挖掘具有重要的意义.     

基于最大节点接近度的局部社团结构探测算法

针对复杂网络社团结构挖掘算法复杂度高的问题,提出一种基于最大节点接近度的局部社团结构挖掘算法。该算法的时间复杂度为O(kd)。为验证该方法计算的准确性和计算的速度,与一种经典的挖掘局部社团结构方法——Clauset算法进行比较。实验结果表明,该算法抽取的社团结构与Clauset算法相比基本一致,但在性能上有明显提高。     

基于最大节点接近度的局部社团结构探测算法

针对复杂网络社团结构挖掘算法复杂度高的问题,提出一种基于最大节点接近度的局部社团结构挖掘算法。该算法的时间复杂度为O（kd）。为验证该方法计算的准确性和计算的速度,与一种经典的挖掘局部社团结构方法——Clauset算法进行比较。实验结果表明,该算法抽取的社团结构与Clauset算法相比基本一致,但在性能上有明显提高。     

基于局部信息检测的多粒度社团挖掘方法

从复杂性和动态性特征出发,给出了复杂网络局部模块度的定义,并提出了基于局部信息检测的社团发现算法,认为局部模块度值最大的节点集合就是最理想的社团结构.在此基础上提出了多粒度社团挖掘方法,为多视图观察复杂网络结构特征提供了新的研究思路.最后的实验分析表明了方法的有效性和可行性.     

改进的基于局部模块度的社团划分算法

针对大多复杂网络社团划分算法不能快速发现最优节点加入社团的问题,提出一种利用节点亲密度的局部社团划分算法。引入节点亲密度的概念量化社团与邻居节点的关系,按照节点亲密度由大到小选择节点加入社团,最后以局部模块度为指标终止局部社团扩展。在真实网络和人工仿真网络进行实验,并与基于信息压缩的随机游走算法等4种典型社团划分算法相比较,所提算法划分结果的综合评价指标(F1score)和标准化互信息(NMI)均好于比较算法。实验研究表明,所提算法具有较好的时间效率和准确度,适用于大规模网络社团划分。     

复杂网络重叠社团挖掘算法

针对Ahn等[1]提出的基于边划分的重叠社团挖掘算法,本文利用扩展模块度做了改进,得到一种新的以边为研究对象的重叠社团挖掘算法,使之可以处理小规模非高度重叠网络,并取得了比较好的划分结果。     

一种基于聚集系数的复杂网络社团划分算法

;社团划分算法是复杂网络研究中的一个热点问题,为发现复杂网络中的社团结构,更好的研究复杂网络的社团性质,本文利用网络中聚集系数提出了一种新的社团划分的算法,该算法综合运用复杂网络中点和边的信息,根据节点和边的聚集系数,计算出节点问的连接紧密程度,由局部到整体来划分出所有的社团结构。传统的复杂网络社团划分算法通过获得全局网络的信息,但随着网络规模的增加,获得全局网络的信息的难度也随之增加,本文提出的新算法避免这一难度所带来的问题。将该算法应用到Zachary空手道俱乐部网络和海豚社会网络,测试结果证明了该算法的可行性。     

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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