基于最小生成树的通信网络设计优化

针对通信网络的设计,利用最小生成树的KRUSCAL算法与改进的哈密顿回路等方法,建立了最小生成树模型、结点故障的环形改进模型、链条破坏的环形改进模型,运用MATLAB编程计算,得出兼顾可靠性与成本费用的合理优化铺设方案,通过比较不同可靠程度下边际新增费用大小,给出了边际新增费用最小的优化网络结构,并将规划后的网络结构拓扑图直观呈现.     

蚂蚁算法在IP路由中的应用

在移动IP通信过程中,数据包需要经过网络中多个指定的节点,以保证节点的移动性;同时移动IP以其独有的特性和特点要求使用一种不同于固网的路由方案以保证移动节点的代理切换时延尽可能小。基于具有很强的随机性和自适应性的蚂蚁算法,将网络的容量限制、流量变化和最短距离结合起来,通过在找到的最短路径上设置障碍物来模拟网络拥塞,找到源结点。目的结点的多条最优路由序列,以便在实际中实时地、自适应地进行动态路由选择。     

基于语义叠加网的对等网搜索机制

针对目前超结点叠加网络研究中的不足,将语义信息引入到超节点的组织过程中,提出了一种新的对等网搜索模型———SSP2P.模型中结点依据小世界理论在物理上形成自然的区域自治系统(AAS),各AAS依据幂规律选取各域内的超结点,超结点再根据语义关系形成多个超结点语义网(SSN),从而形成一个层次化的超结点叠加网络模型.实验结果表明:该模型在保证系统扩展性的基础上有效地提高了搜索效率,减少了通信开销.证明在超节点叠加网络的构建过程中语义信息的引入有利于对等网搜索性能的提高.     

谈基于WLAN技术的校园网建设的特点及方案研究

目前绝大多数学校拥有校园网,但很多都使用有线网络,它受到布线的限制,而且存在线路容易损坏、网络节点不可移动等缺点,在连接距离较远的结点时,铺设施工难度大,工作效率低。而随着WLAN技术标准的不断推出以及基于这些标准的无线产品的出现,WLAN的应用和普及已发展到了一个新阶     

高速铁路专网覆盖解决方案

完善的铁路GSM网络覆盖不仅能给用户提供便利的通信服务,创造更优质的网络价值,而且是以后第三代移动通信网络的铺设和扩容提供坚实基础;不但能为中国移动业务的发展带来商机,也能为我国信息化的发展带来巨大的促进作用。本方案通过使用BBU+RRU这种组网方式,针对对不同区域类型,不同覆盖场景的解决方案论述,可为高速铁路的覆盖达到最优的效果,同时也可为其他同类工程提供参考和借鉴。     

主动网络防御系统研究

传统计算机网络中的网络结点主要是被动地在各端系统之间提供比特传输,而对数据本身的语义不作分析解释,仅具有报文头处理或产生信号等极少的计算功能.而主动网络作为一种新型的网络计算模型,其网络中的结点不仅能够在用户数据上执行较高级别的计算操作,而且允许具体用户根据具体要求来定制主动程序,使传输网络具备一定的智能.主动网络的构建是基于传统网络的,将传统网络中某些关键位置的网络结点配置为主动结点,使主动网络结点与传统网络结点(路由器、变换机等)各司其职、协同工作于一个网络环境中.     

基于Packet Tracer的路由综合实验设计与实现

阐述了网络层路由的基本概念、工作原理及特点,通过Packet Tracer仿真设计了静态路由、动态路由综合实验,实现了不同网络结点之间的通信,让学生能够从理论上和实践上更好地掌握网络层路由技术。     

集群网络结点互动对医药产业创新的影响

从产业集群网络视角研究了医药产业的创新活动,分析了医药产业集群网络结点构成及结点之间的互动关系,并基于结点间的互动对于医药产业创新的影响构建了医药产业网络创新模型。     

无标度网络的通信动态

研究了无标度网络的通信动态,提出两个新的网络资源分配方案,即基于节点负载特征方案和基于节点度的方案,并给予了合理性解释．仿真研究表明,这两个方案都能明显地提高网络的通信容量．     

区域创新网络的结点联结及其启示

在全球化和知识经济背景下,技术创新模式从传统的线性创新模式向网络创新模式特变,区域创新网络成为一种分析区域创新与发展问题的崭新视角。因此,明晰区域创新网络内涵,对区域创新网络主要结点以及结点间关系链条的形成进行深入分析,将有助于加强我国各地区结点联结和创新网络的形成。     

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?     

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…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.