基于TCP会话劫持的校园网安全告警系统

本系统通过端口镜像对校园网边界出口处的网络流量中TCP三次握手状态信息进行监测,并根据自定义的匹配过滤策略来精心构造会话劫持报文,以旁路方式发回给校园网内主机,来达到干预有问题的用户到外网的TCP会话的目的.干预的结果可以是立即中断TCP连接,也可以是将用户的所有HTTP访问请求重定向到指定的安全告警页面.本研究为在校园网内构建一种有效的安全告警系统提供了方向,同时也在过滤不良网站,用户身份认证等方面有着广泛应用.     

WCDMA-OMC告警分析工具设计与实现

该系统是OMC网络管理系统的辅助工具,主要针对告警等OMC数据进行采集和分析.通过关联业务数据和配置数据,进行告警加工、过滤和显示,突出重点故障,提供方便的运维工具辅助操作人员快速定位出故障并及时解决.改变了原有先平台化,再实现用户需求的思路,实现先进行用户需求原型化、规范化后再标准化抽取实现平台化的目的.该工具独立于现有网络管理系统运行,可单独发布和使用.通过现场数据的测试证明,该工具可以很方便地辅助用户定位故障,对一些用户不需要关注告警系统进行过滤,大幅度地降低告警数量,告警信息清晰,界面简洁明晰,使用方便.     

基于Lucene的校园网搜索引擎的设计与实现

利用基于校园网的搜索引擎来搜索学校局域网内的信息已成为人们关注的热点,一方面是因为校园网内信息量不断增加,利用搜索引擎可以提高搜索效率;另一方面是因为由于网络设计的限制,百度等搜索引擎搜索不到局域网内的很多信息.在研究搜索引擎基本原理和技术的基础上,设计了基于Lucene的校园网搜索引擎.测试表明,本系统能很好地完成用户的搜索要求.     

Linux环境下基于LDAP验证的高校校园网OpenVPN应用方案设计

在Linux系统环境下,应用OpenVPN开源软件搭建高校校园网远程访问VPN,远程拨入VPN用户可以利用校园网防火墙映射的VPN服务器公网IP,与校内的OpenVPN服务器建立SSL安全连接。通过在OpenVPN服务器上编写Python脚本查询OpenLDAP服务器内的用户信息目录数据,实现远程拨入用户的身份验证。在安装OpenVPN服务器的Linux主机上配置访问授权及IPtables防火墙的源地址转换功能,实现方便校园网用户通过Internet安全地访问校内私有资源,同时也可满足教职工远程办公的需求。     

网络安全、可信系统技术分析——可信系统、入侵检测以及防火墙

主要论述了入侵检测系统可以被描述成一个检测器;防火墙是一种有效的防御工具,审查并过滤所有非法从Internet到受保护网络的连接;可信系统是将数据信息进行安全分级,使操作系统可以通过管理用户文档来控制用户对数据的访问.     

高校校园网统一身份认证系统的安全研究——以山西大学商务学院校园网为例

网络身份认证技术的逐渐成熟,为高校校园网实现统一身份认证技术和"一卡通"系统提供了网络基础.校园网的应用现状对身份认证系统提出了现实需求.本文将通过介绍山西大学商务学院校园网建设的总体设计思想与功能,针对校园网内用户访问量大且多数用户访问权限有限,以及身份认证系统在实施过程中存在的问题,提出基于802.1x的统一身份认证系统的安全管理方案.     

基于RADIUS协议的校园网络认证系统的研究

随着校园网络的发展,以及用户的不断增加,如何在校园网中对用户进行安全、高效的认证和访问控制,已经成为首要解决的问题。文章尝试通过对Linux的Netfilter包过滤技术的接口编程,将Netfilter包过滤技术与RADIUS认证系统结合起来,从而实现了对校园网络用户进出Internet的认证和访问控制。     

校园网安全与防火墙设计

本文讨论了日益突出的校园网安全问题,介绍了经济实用的基于包过滤和代理的复合型屏蔽子网防火墙系统的设计及其安全规则的实现.还提出了"校园网安全系统"的概念以及需要考虑的一系列问题.     

校园网统一身份认证系统的探讨

随着校园网应用的扩大,各种基于网络的应用系统广泛地应用于校园的教学、科研和管理中,但是各种应用系统独立的用户管理和认证策略,不仅给用户使用和应用系统维护带来不便,而且容易影响校园网的安全,因此,建立统一的身份认证系统,对网络用户实行集中管理、统一认证和授权是网络发展的趋势.就统一身份认证系统的结构、实现方法和安全措施方面进行探究,以保证用户在使用方便的基础上,有效地维护校园网的安全.     

基于LDAP的校园网统一身份认证系统设计

随着校园网基础设施的不断投入与升级 ,基于校园网的应用得到迅速发展 ,迫切需要校园网统一身份认证系统的支持 .基于LDAP的校园网统一身份认证系统 ,利用分布式的目录信息树结构 ,对用户身份信息和系统控制信息进行有效组织和管理 ,可以提供高效安全的目录访问     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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