嵌入社区半径的力引导与径向树混合布局算法

力引导布局算法存在无法展示复杂网络社区结构的缺陷,虽引入聚类的方式来展示社区结构,但社区内节点拥挤且排列无序,不利于观察社区内节点的结构特征与连边关系,为此提出嵌入社区半径的力引导与径向树混合布局算法.该算法首先采用K-means算法对网络节点进行社区划分;然后,用社区内节点数量确定社区半径,并将社区半径嵌入到社区斥力、引力中来展示社区结构;最后,采用径向树布局分层可视化各社区内节点.实验中使用拥挤区域占比、点分布偏差、节点偏差等指标验证了本算法既能降低拥挤度又能减少节点布局偏差,可视化结果显示,本算法布局社区结构明显,节点层次分明,易于理解.     

一种基于异域自适应的新型社团发现算法

社团发现已被广泛应用于社会学、生物学、物理学和计算机科学等诸多领域.通过发现复杂网络中的社团结构,可以帮助人们理解和分析复杂网络的功能,发现复杂网络中隐藏的规律并预测复杂网络的行为.目前,已有的社团发现算法主张融合网络结构信息和内容信息,以更好地避免网络噪声和节点缺失等原因对算法有效性产生影响.然而,它们并没有考虑当网络结构信息和内容信息维度不同时如何进行信息融合.针对该问题,提出一种基于异域自适应理论的网络社团发现算法CDHDA.该算法能够将不同维度的网络结构信息和内容信息映射到同一维度的子空间中,以实现对不同维度的信息融合.此外,在信息融合过程中可以对主要信息特征进行加强,以降低网络噪声和节点缺失对算法性能的影响.通过真实的社交网络数据集与经典的社团发现算法进行对比,验证了该算法的有效性.     

基于UCINET的词汇共现网络可视化研究

词汇按照一定规则相互联系形成的网络结构呈现出复杂网络特征。本文首先给出了词汇共现网络的构造方法，分析词汇网络的复杂网络特征，然后利用复杂网络可视化工具UCINET对词汇共现网络进行可视化研究，从可视化网络图中获取词汇聚类的涌现。     

基于多层次和多粒度的混合布局可视化算法及其应用

该文提出一种混合布局可视化算法,以多层次和多粒度的方式展示Internet网络拓扑结构,动态反映被管对象的运行状态。算法根据各层面的网管需求以及不同规模的网络特点,针对各种场景的可视化处理,采用相应的图布局算法和实现方式。算法实现应用于iNetboss综合网络管理系统。在清华大学校园网上实际部署和运行表明:该算法与单一的图布局算法相比,更能满足用户的需求,而且对网络的设计与配置、网络运行的管理与监控也都起到很好的优化作用。     

基于硕博士论文关键词构建知识图谱分析企业热点

本文对我国硕博士论文研究华为、阿里和腾讯3家大型企业的热点以及热点之间关系和热点的演化进行了探讨.首先观察论文的数量变化与学科分布,然后构建关键词知识图谱对关键词之间的内部结构特征和演化方式进行可视化展示,结果发现硕博士基本从企业的发展特色展开研究,同时从关键词知识图谱网络的演化角度来看,网络结构越来越复杂,网络中心逐渐转移或多样化,并从知识图谱网络的异配系数与结构熵分析来看,硕博士论文的研究是以热点与新问题相结合的研究方式进行.硕博士论文的研究越来越广,也越来越富有创新性.     

基于C3D模型的视频分类技术

目前,解决视频分类问题比较典型的方法是使用深度学习方法.该文设计了一种新的神经网络结构用于解决视频分类问题同时使用了交叉熵损失函数和一些减少神经网络过拟合的方法.网络结构采用了3D卷积神经网络结构,这是由于3D卷积神经网络相比2D卷积网络可以同时处理图像时域信息和图像空间信息,保留输入信息的时间特征.我们将视频文件通过各种手段,转化为图像帧的形式,放入该文设计的3D卷积神经网络中学习和训练,最后通过分类器对图像的的种类进行划分,得到每个数据分类概率的结果.与之前的C3D网络相比我们增加了网络的深度,优化了网络结构,并通过实验验证了改进的有效性.     

基于物体6D姿态估计算法的增强现实博物馆展示系统

针对文化遗产资源缺少生动逼真、沉浸感的展示的问题,基于增强现实技术,融合人工智能,提出了一种基于物体6D姿态估计算法的增强现实博物馆展示系统,用于文化遗产三维可视化展示。物体的6D姿态估计是指检测图像中出现的物体,并且估计其相对观察者的3D位置和方向。在增强现实领域中,6D姿态估计用于测量真实环境中物体的姿态,并将虚拟物体以正确的姿态添加到它们上面。针对增强现实系统中场景和对象融合精度低、速度慢的问题,研究了一种端到端的物体6D姿态估计网络,实现从RGB图像中进行物体目标检测以及姿态估计,提出的方法使用并联网络结构提取高分辨率特征,可以保留更多的空间信息,提升预测物体关键点的精度,使用一个姿态推理网络方式替代传统的数学计算方法,从关键点中得到物体的姿态,实现端到端姿态估计,提升检测速度。在该方法的基础上,研究了结合云计算、5G通信等多项技术的增强现实分布式框架,实现移动端的增强现实应用。实验结果表明,文中提出的物体6D姿态估计方法的准确率达到92.6%,运行速度达到30帧/s,满足增强现实应用的需求,可用于增强现实博物馆展示系统,为其提供生动的互动内容,突破文化遗产实物的时空局限性,为观众带来身临其境的参观体验。     

基于Unity3D的采矿机械零件库系统设计

以Unity3D为可视化开发平台,将虚拟现实技术引入到采矿机械零件库系统的设计中,采用JSP动态网页技术,设计一款用于采矿行业的机械零件三维零件库.该系统能够对机械零件进行全方位展示,使用户得到交互体验,为产品的网络展示和宣传提供了新思路.     

一种基于层次化社团结构的复杂网络可视化平台

基于层次化的网络社团结构,提出了一种可以应用于大型复杂网络的可视化方法,并编程实现了交互平台.该平台采用圆环布局,能提供大量的交互功能,使用户从不同层次上查看网络结构信息.平台还实现了重叠节点的找寻,以及社团动态演化等与网络社团分析有密切关系的功能.     

多源网络安全日志数据融合与可视分析方法研究

根据网络安全事件多源关联性的特征,为了提高用户对网络安全事件的认知、分析能力,提出了一种基于日志-事件的网络事件提取和融合方法,为了增强分析系统的可交互性和提高对网络安全数据的分析效率,研究并设计了针对大规模网络的协同可视化方案和3D可视化模型的布局算法,开发了基于以上技术的网络安全可视分析系统(NSVAS)。实验结果表明该系统对于大规模、长时间跨度的网络安全数据具有较强的分析能力,能够有效识别不同类型的入侵访问,帮助用户快速发现异常行为和进行网络取证。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.