oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2019 ( 71 )

2018 ( 1026 )

2017 ( 1035 )

2016 ( 1232 )

自定义范围…

匹配条件: “ 赵海兴” ,找到相关结果约136573条。
列表显示的所有文章,均可免费获取
第1页/共136573条
每页显示
一类四正则小世界网络的生成树数目的算法
Spanning Trees in a Class of Four Regular Small World Network
 [PDF]

贾环身, 海兴
Computer Science and Application (CSA) , 2014, DOI: 10.12677/CSA.2014.43009
Abstract:
生成树是表征网络结构性质的一个重要物理量,然而精确地确定网络上的生成树数目是一个巨大的理论挑战。本文提出了一个四正则小世界网络模型。介绍了其概念及演化过程,详细计算了四正则图的相关拓扑特性,例如直径、聚类系数等。给出了此类四正则网络的生成树数目计算方法,得出生成树数目公式及熵。研究发现,所研究网络的生成树的熵与具有相同平均度的其他网络形成了鲜明的对比,因为后者的生成树的熵小于所研究网络。因此,这一四正则小世界网络上的生成树数目比其他具有自相似结构网络生成树的数目要多
Spanning tree is an important quantity characterizing the reliability of a network; however, explicitly determining the number of spanning trees in networks is a theoretical challenge. In this paper, we present a class of four regular network model with small world phenomenon. We introduce the concept and evolving process and determine the relevant topological characteristics of the four regular network, such as diameter and clustering coefficient. We give a calculation method of number of spanning trees in such four regular network and derive the formulas and the entropy of number of spanning trees. We find that the entropy of spanning trees in the studied network is in sharp contrast to other small world with the same average degree, of which the entropy is less than the studied network. Thus, the number of spanning trees in such four regular network is more than that of other self-similar networks.
一种确定性小世界网络模型平均路径长度的逼近方法
An Approximation Algorithm for Average Path Length in A Small-World Network Model
 [PDF]

张科, 海兴, 李峰
Advances in Applied Mathematics (AAM) , 2014, DOI: 10.12677/AAM.2014.31004
Abstract:
确定性小世界网络是复杂网络中的一个重要的研究分支。2008年,章忠志等人(Eur.Phys.J.B 63)在复杂网络的视角下对确定性均匀递归树作了详尽地分析,得到了其拓扑属性。尽管确定性均匀递归树的平均路径长度表现出了网络大小的对数规模,但是它的聚类系数为零。2012年,陆哲明等人(Physica A 391)通过在确定性均匀递归树的基础上以一个简单的规则添加一些边得到一个确定性小世界网络模型。本文根据网络模型的结构用分析的方法给出了文献Physica A 391中的模型的平均路径长度的逼近方法。
Deterministic small-world network is an important branch of study of complex networks. In 2008, Zhang et al. in Eur.Phys.J.B 63 have offered detailed topological characteristics of the deterministic uniform recursive tree from the viewpoint of complex network. They derived topological characteristics of the deterministic uniform recursive tree. It shows a logarithmic scaling with the size of the network, however, its clustering coefficient is zero. In 2012, Lu, et al. in Physica A 391, based on the deterministic uniform recursive tree, by a simple rule to add some edges, got a deterministic small-world network model. In this paper, using an approximation algorithm based on the network construction, we show explicitly the average path length of the model constructed in Physica A 391.
一种星–树结构的确定性的小世界网络
A Star-Tree-Structured Deterministic Small-World Network
 [PDF]

侯鹏锋, 海兴
Computer Science and Application (CSA) , 2014, DOI: 10.12677/CSA.2014.411038
Abstract:
在过去的的几十年,人们运用各种机制建构了许多不确定性的和确定性的小世界网络。最近,郭世泽等人通过在星图K1,2上运用一个简单的算法在每个迭代步添加一些边首次形成了一个二叉树结构的确定性的小世界网络。本文通过一个星图K1,6在每个迭代步连接每个树的各祖父节点和它的四个孙子节点,由此构建一个二叉树结构的新的确定性的小世界网络模型。此外,我们给出了一些拓扑属性的分析结果,它表明构建的模型是小世界网络。
In the past dozen years, many probabilistic small-world networks and some deterministic small- world networks have been proposed utilizing various mechanisms. Recently, Guo et al. proposed a deterministic small-world network model by first constructing a binary-tree structure from star K1,2 by adding some edges in each iteration with a simple mechanism. In this paper, we propose a new deterministic small-world network model by constructing a binary-tree structure from a star K1,6 and then adding links between each grandfather node and its four grandson nodes for each tree in each iteration. Furthermore, we give the analytic solution to several topological characteristics, which shows that the proposed model is a small-world network.
一类确定性小世界网络模型及特性分析
A Kind of Deterministic Small-World Networks Model and Analysis of Their Characteristics
 [PDF]

张科, 海兴, 李发旭, 肖玉芝, 李峰
Computer Science and Application (CSA) , 2014, DOI: 10.12677/CSA.2014.42006
Abstract:
确定性小世界网络是复杂网络中的一个重要的研究分支2008章忠志等人(Eur.Phys.J.B 63)在复杂网络的视角下对确定性均匀递归树作了详尽地分析,得到了其拓扑属性尽管确定性均匀递归树的平均路径长度表现出了网络大小的对数规模但是它的聚类系数为零2012陆哲明等人(Physica A 391)通过在确定性均匀递归树的基础上以一个简单的规则添加一些边得到一个确定性小世界网络模型本文在新的视角下对文献Physica A 391中的模型的构造规律进行了探究并自然地对其进行了推广构造了一类确定性小世界网络模型然后运用分析的方法给出了所构造网络模型的几个重要拓扑属性包括呈幂律分布的累积度分布、高的聚类系数和小的直径
Deterministic small-world network is an important branch of study of complex networks. In 2008, Zhang et al. in Eur.Phys.J.B 63 have offered detailed topological characteristics of the deterministic uniform recursive tree from the viewpoint of complex network. They derived topological characteristics of the deterministic uniform recursive tree. It shows a logarithmic scaling with the size of the network; however its clustering coefficient is zero. In 2012, Lu et al. in Physica A 391, based on the deterministic uniform recursive tree and by a simple rule, added some edges and got a deterministic small-world network model. In this paper, we study the law of the structure on the basis of the model constructed
有向三角形树的匹配数
On the Matching Number of Directed Triangle Trees
 [PDF]

李梦英, 海兴
Computer Science and Application (CSA) , 2016, DOI: 10.12677/CSA.2016.65036
Abstract: 有向图G的一个匹配是由其一组没有公共起点也没有公共终点的有向边构成的集合。图G的k匹配是指含k (k = 1, 2, …, n)条有向边的匹配;图G的k-匹配数是指含k (k = 1, 2, …, n)条有向边的匹配的选择方法数;图G的匹配数指所有k-匹配数的和。刘和Barabasi等人提出:有向网络的可控节点数等于有向网络的顶点数减去最大匹配包含的边数。说明有向网络的可控性与有向网络的匹配数有着密切的联系。因此,研究有向网络的所有匹配数目具有一定的应用意义。这篇文章主要研究一类有向三角形树的所有匹配数的计数问题和极值问题。给出了一类含n个三角形的有向三角形树匹配数的计算方法,以及有向三角形树匹配数的上下界和相应的结构。
A matching of a directed graph G is a set of some directed edges without common starting-node and end-node. K-matching of a digraph G is the matching with the k (k = 1, 2,…, n) edges; k-matching number of a graph G is the number of distinct matchings containing k (k = 1, 2,…, n) edges. The matching of a graph G refers to the number of all k-matchings. Liu and Barabasi put forward: the number of controllable nodes in directed networks is equal to the number of nodes of directed networks minus the number of edges of the maximum matching. It illustrates that the matching number and controllability of directed networks have a close connection. Thus, the research of the number of all matchings of directed networks is of applied significance. This article mainly studies the counting problems and the extremal problems on the number of matchings in a class of directed triangle trees. We investigate the calculation method and the expression of the matching number in a class of directed triangle trees with n triangles and determine the bounds for the matching number in directed triangle trees with n triangles and the correspond graphs.
基于耦合映像格子的有向网络相继故障
马秀娟,马福祥,海兴
计算机应用 , 2011,
Abstract: ?针对现实世界中存在大量的有向网络,根据有向网络中边的有向性,提出适合描述有向网络耦合映像格子(cml)的相继故障模型,利用仿真分析的方法研究了ba无标度有向网络和er随机图有向网络在该模型作用下的相继故障行为。仿真中,对节点数固定的网络采用蓄意攻击和随机攻击两种策略进行攻击,并记录相关数据。通过对所得数据的分析发现:1)这两类有向网络的相继故障进程比同规模的无向网络要剧烈;2)当网络遭受攻击时,有向网络比无向网络更加脆弱;3)er随机图网络相继故障发生过程中引起网络相继故障规模增长的4个临界值之间存在线性关系。
基于dlp的自认证代理签密方案
俞惠芳,海兴,王之仓,王小红?
计算机科学 , 2010,
Abstract: 自认证密码体制可以实现无公钥证书和密钥托管,代理签密是将代理签名和签密相结合的一种方案。在已有研究的基础上,集成自认证密码体制和代理签密,提出了一种新的基于dlp的自认证代理签密方案,并在有限域上离散对数问题的难解性下,给出了其正确性和安全性证明。
流线闭口箱梁断面涡振过程分布气动力演变特性
胡传新,海兴,周志勇,,葛耀君
- , 2017, DOI: 10.11918/j.issn.0367-6234.201704133
Abstract: 涡激振动是大跨度桥梁在低风速下较常见的风致振动现象,探究涡振机理是桥梁涡激振动效应评价与控制的重要前提.为深入研究涡振机理,立足于涡振发展的完整过程分布气动力与结构行为同步演变特性分析,深入揭示了分布气动力及其结构行为作用机制.以典型大跨度桥梁闭口流线型箱梁断面为对象,实现了弹性悬挂节段模型同步测力、测振和测压风洞试验.针对典型涡振过程风速关键结点,对比研究了涡振发生前、锁定区上升区、振幅极值点、下降区以及涡振后等不同时期箱梁表面分布气动力演变特性.研究表明,涡振过程箱梁分布气动力特性具有明显的变迁历程,集中体现在涡振锁定区内外表面气动力特性具有显著差异,压力系数根方差、振动卓越频率处压力系数等统计参数与涡振振幅高度相关,气动力与涡振振幅具有明显同步演化关系,尤其是上表面下游、下表面与下游风嘴转角附近区域气动力演变特性显著,是引起涡振的主要原因.该研究为涡振机理研究提供了一种新的思路和方法,未来可应用于其他类型主梁断面.
The vortex-induced vibration (VIV) is a typical phenomenon of wind-induced vibration in low wind velocities, especially for the long-span bridges, and an important prerequisite for the evaluation and control of the vibration effects on bridges. Based on synchronously evolutionary characteristics analysis of distributed aerodynamic forces and structural effects during VIV, characteristic of distributed aerodynamic forces and their effects on structural behaviors were conducted to reveal the mechanism of VIV. Aiming at a traditional streamlined closed-box girder of long-span bridges, wind tunnel tests of synchronal measurement of force and displacement responses of spring-suspended sectional model were conducted. Pressure-measured tests were implemented to investigate the spatial aerodynamic distribution of the girder during VIV. Surface pressure distributions in different amplitude-developing period during VIV were compared, including pre-VIV period, ascent stage, amplitude extreme point, descent stage and post-VIV period. It is found that aerodynamic characteristics of the model has obvious changes during VIV, indicating that there are obvious differences between lock-in period and non-VIV period. The distributed aerodynamic forces and the amplitudes of aerodynamic forces at predominant frequency are positively correlated with the amplitude of VIV responses. The aerodynamic characteristics and the VIV response during VIV are synergistic, especially nearby downstream region of upper surface and the corner region of lower surface and tail wind fairing, which is the main cause of VIV. This study provides a new way for the research on the mechanism of VIV, and can be applied to other cross-sections.
静电
海兴
现代物理知识 , 1992,
Abstract: 人类对电现象的认识始于静电.从古希腊哲学家塞利斯记载的木头摩擦琥珀能吸引草屑,到十六世纪英国的吉尔伯特的各种摩擦电实验,基本上都是对静电现象的观察和定性的总结.定量研究则始于十八世纪英国的卡文迪许和法国的库伦.自从1800年意大利的伏打发明电堆、获得了持续、稳定的电流之后,静电似乎已完成了历史的使命而与技术无缘.然而进入二十世纪,特别是50年代以来,随着石油化工的兴起,高分子绝缘材料的涌现,静电科学逐渐转向静电技术,其应用领域日趋扩大,静电已成为物理学领域中既古老而又年轻的一门分支学科.
微粗糙平面上Chaplygin球永久转动的稳定性
海兴
力学学报 , 1989, DOI: 10.6052/0459-1879-1989-6-1989-368
Abstract: 本文讨论微粗糙平面上chaplygin球绕铅垂轴永久转动的稳定性,严格证明了在粘性摩擦条件下球绕最小和中间惯量主轴永久转动的不稳定性,以及在粘性和库仑两种摩擦条件下绕最大惯量主轴永久转动的一致稳定性。
第1页/共136573条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.