网络结构视角下区域产学研创新网络风险分析

根据系统论的观点,网络结构影响网络特性。在区域产学研合作创新网络中,通过分析聚集系数、平均最短路径长度、度分布三个网络结构变量,找出其与网络风险的联系,进一步完善和推进区域产学研合作创新网络形成和发展。     

Scale-free网络鲁棒性研究

本文首先总结了复杂网络研究的现状和成果,介绍了复杂网络的一些基本度量值和常见模型,然后,以BA无标度网络模型为基础,以平均最短路径和聚类系数为衡量标准,通过分析遭遇随机故障和蓄意攻击后网络性能的变化,得到复杂网络节点数和平均度对其可靠性的影响。仿真结果证明了无标度网络鲁棒但又脆弱。     

CERNET主干网2007年1月运行情况CERNOC运行报告

CERNET NOC是CERNET主干网和国际联网运行和管理的网络运行中心,带领全国36个地区的38个节点(含CERNOC)NOC负责人,共同维护和管理CERNET主干网、地区网、省级网,确保线路的畅通,机器、设备的稳定运行,路由的正常管理与维护等。CERNET NOC主要负责线路的:配置管理:管理配置路由设备,保障IP网络路由正确性;故障管理:线路故障、路由故障、网络设备故障、异常流量     

用于复杂网络节点重要度评估的离心率算法改进研究

复杂网络中的节点重要度评估一直备受关注。鉴于离心率中心性只考虑节点最大最短路径存在一定局限性,通过计算处理节点的平均最短路径,考虑离心率数值与平均最短路径的差值,提出改进后的新方法。在具有代表性的APAR网络上进行计算实现,并与其它节点重要性评估方法进行对比,发现该方法较离心率中心性方法,对于节点的粗略划分更加精细、有效|在SI模型的模拟对照中,发现该方法在最终第10个单位时间时,准确性相较于离心率中心性提升了15%。     

基于复杂网络理论的多式联运网络脆弱性分析（英文）

为了研究多式联运网络的结构特性以及在网络节点失效的情况下网络的脆弱性,基于复杂网络理论描述网络拓扑结构特性,并明确关键节点.分析多式联运网络在节点遭遇随机攻击和刻意攻击(关键节点)后网络平均最短路径和最大连通子图的比例,以此分析网络脆弱性.以一家多式联运企业网络为例进行实证分析.结果表明,随机攻击下,被攻击节点数大于10时,最大连通子图的比例低于20%且平均最短路径小于2,而攻击关键节点情景下,失效节点数大于7就已达到同等效果.关键节点失效时网络性能下降速度明显大于随机节点失效情景,保障关键节点运作能力能有效降低网络脆弱性.该方法可帮助多式联运企业确定关键节点并制定节点失效应急管理方案,提高企业网络从节点失效中恢复的能力.     

如何进行vlan的划分

图1学院拓朴图2vlan对照表目前,在网络工程中使用最多的vlan划分方法是第一种和第四种的混合型:根据端口来划分vlan,利用IP三层交换技术来实现路由。下面的讨论也主要是针对这种方式。广东女子职业技术学院今年开始网络改造建设,新的网络拓朴如下:综合楼、教学楼和六栋学生宿舍由光纤联到网络中心的核心交换机上。各栋楼层内部分别由层间汇聚和楼层汇聚组成,由Extreme的200和400系列交换机连接。本文主要针对综合的vlan划分进行阐述。综合楼主要由两台Extreme400交换机组成,下面连接了7个系部和学院的各个办公室。由于各个办公室由多间房…     

基于复杂网络理论的多式联运网络脆弱性分析

为了研究多式联运网络的结构特性以及在网络节点失效的情况下网络的脆弱性,基于复杂网络理论描述网络拓扑结构特性,并明确关键节点.分析多式联运网络在节点遭遇随机攻击和刻意攻击(关键节点)后网络平均最短路径和最大连通子图的比例,以此分析网络脆弱性.以一家多式联运企业网络为例进行实证分析.结果 表明,随机攻击下,被攻击节点数大于...     

如何发现和防止Sniffer

网络监听主要使用Sniffer(嗅探器),是一种常用的收集有用数据的工具,这些数据可以是用户的帐户和密码,也可以是一些商用机密 数据等.网络监听是采用被动的方式,它不与其他主机交换信息,也不修改密码,这就使对监听者的追踪变得十分困难,因为他们根本就没留下任何痕迹.解决这些问题的办法就是加密和网络拓朴结构.     

天津广播电视大学计算机校园网设计

计算机远程教育网络是广播电视大学最重要的信息基础设施。本文简要介绍天津广播电视大学计算机远程教育网络第一期工程的设计方案,包括总体目标、设计原则、网络拓朴结构、技术选择、系统配置以及网络的下一步发展,旨在集思广益,加快天津电大教学现代化的进程。     

最长和最短

最长和最短老师问学生:“什么最长?什么最短?”学生立刻回答:“一堂课的最后几分钟最长,一场考试的最后几分钟最短。”A teacheraskedone ofhisstudent:“s What isthelongestand whatistheshortes?t”The studentansweredimmediatel:“yThe lastseveralminutesofa classisthe longes,t whilethe lastseveralminutesofan exam istheshortes.”t最长和最短@小非…     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.