智慧协同网络族群的分布式管理机制

针对智慧协同网络"三层"、"两域"的结构特点和资源适配层族群行为聚类,利用控制平面与转发平面分离思想,提出了一种族群分布式管理机制.该路由管理机制在资源适配层中层次化的部署族群控制器,对网络路由策略进行层次化的管理,实现了整个网络路由和内容存储管理功能.在Mini-Net平台上对该路由管理机制进行开发和实验,抓包验证了信令交互流程.结果表明:该管理机制采用路由策略优化网络结构,降低时延,提高了网络性能.     

基于路由协议交互的域间路由动态监测

为了解决实时域间路由动态监测的问题,提出了一种基于路由协议交互的域间路由监测方法。该方法通过一个具有部分路由引擎功能的监测代理连接网络,获取网络中的路由交互信息,通过对路由交互信息的分析,监测网络拓扑的变化情况以及其他网络动态行为。在实际工作中,实现了一个基于该方法的域间路由动态监测系统,并部署于第二代中国教育和科研计算机网CERNET 2中。该方法能够实时地分析域间路由的动态性,并且几乎不会对网络和路由器造成额外的负担。     

基于路由器的网络安全研究

路由器是一种重要的网络互联设备,在网络中有着极其重要的作用,本文深入研究了CISCO的网间网操作系统(Internetwork Operating System,IOS)的各种命令集合,从庞大的命令集合中找出一套在网络安全方面有重要作用的集合,灵活运用各种IOS命令,通过对常见的网络攻击手段[IP地址欺骗(Ip spoofing);源路由(Sourceroute)攻击;Smurf攻击;SYN攻击;]的分析,阐明采用路由器(CISCO)阻止各种网络攻击的方法.     

一种增强Ad hoc网络路由协议安全性的方案

移动AdHoc网络是一种新型的无线移动网络 ,由于它具有开放媒质、动态拓扑、分布式合作及受限的网络能力等特点 ,所以特别容易受到攻击 .在Adhoc网络中 ,一个节点不仅是一个主机 ,而且是一个路由器 ,它可以在网络中寻找和保持到其他节点的路由 .如果路由被误导 ,整个网络可能陷于瘫痪 .所以 ,路由安全是整个Adhoc网络的安全中最重要的一环 .论述了Adhoc网络几种路由协议 ,并针对Adhoc网络中AODV协议的黑洞攻击 ,提出了一种增强性的安全解决方案 ,该方案能在一定程度上解决黑洞问题并可防止假冒攻击     

多radio无线mesh网络跨层路由协议

与传统的无线多跳网络不同,多radio无线mesh网络的路由器是固定的,节点具有异构性。提出一种协作的异构多radio无线mesh系统路由设计模型,该路由协议模型按路由发现过程,分4个子模块,分别为半同步式邻居发现机制r、adio异构刻画的路由metric、分层的信息发布模型、满足业务需求的路由算法。该路由协议模型对多radio的异构性进行了刻画,采用分层协作方式共享网络拓扑信息。实验证明这种适应异构无线环境的跨层路由设计方案比传统方案更符合用户需求。     

高性能安全路由器BW7000的设计与实现

高性能和安全是计算机网络研究的两个主要问题。路由器在保证转发性能的前提下提供网络安全保护已经成为当前的研究热点。文章介绍了在完成国家"八六三"计划重大课题"高性能安全路由器"的过程中解决的若干关键技术问题。高性能安全路由器BW7000基于自主设计的高性能路由器操作系统HEROS。为保证高性能的路由转发,设计实现了基于RAM的高性能路由查找算法;为支持服务质量控制和安全管理,设计实现了基于无冲突HashTrie树的分组分类算法和基于反馈的分布式分组调度算法;为保证网络安全,提出了基于分布式密钥管理的路由器安     

基于模拟器的三层交换设计与实现

针对三层交换机由于价格较高,对于学习网络设备配置的用户来说,实验的开展只能通过其他方式进行,例如使用模拟器进行网络实验模拟的情况。该文介绍使用思科公司推出的模拟器Packet Tracer进行网络实验,划分VLAN（虚拟局域网）并在模拟器提供的三层交换机上启用VLAN间路由,将三层交换机与路由器配合使用,配置OSPF动态路由协议,不仅实现了三层交换,还实现了文章所示的拓扑结构中全部网络的通信。     

基因算法在路由算法中的应用

随着计算机大型网络的迅猛发展,路由技术在网络中已逐渐成为关键技术。用户的需求推动着路由技术的发展和路由器的普及,人们希望最大限度地利用全球各个地区、各种类型的网络资源。随着网络带宽的急速增加,对路由算法提出了新的要求。基因算法是一类借鉴生物界进化规律演化而来的随机化搜索方法,已被人们广泛地应用于组合优化、机器学习、信号处理、自适应控制和人工生命等领域。基因算法对如何在下一代Internet上实现高质量网络服务和建立新的路由算法模型有着积极的指导作用。     

高校多出口网络的路由策略研究

在高校多出口的网络中,利用基于目的地址和基于源地址的策略路由,并通过动态路由和静态路由的有效结合,提出了一种改进型校园网多出口路由策略方案．该方案充分利用了路由器和防护墙的性能特性,使网络的出入速度都大幅提升,从一定程度上解决了目前高校面临的多网络出口的一些常见问题．目前该方案在高校校园网中已得以实际应用,是一种行之有效的校园网出口管理的解决方案．     

路由技术及路由器

日前,网络技术不断更新,作为网络核心器件的路由器也在不断的升级换代,本文主要介绍了什么是路由技术,路由的工作原理和分类,还介绍了路由器的相关特点、功能和互联网常见路由器的种类分布。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with