分布式网络病毒检测机制分析与系统实现

钟对目前入侵检测系统不能适应异构网络环境、缺乏协同响应的不足,给出了一种分布式入侵检测与响应协作模型,基于此模型分析了分布式网络病毒检测系统Snort,井详细讨论了系统的相关特性和功能架构.所设计的系统能够对大型分布异构网络进行有效的入侵检测.对网络入侵检测系统的设计有一定参考价值,对分布式网络安全问题是一个有益的探索.     

分布式入侵检测系统组件间的通信认证策略

对于大规模、分布式的网络结构来说 ,分布式入侵检测系统是实现网络安全的重要手段之一 .分布式入侵检测系统由多个组件构成 ,它们之间需要相互通信 ,而认证又是保证其通信安全的关键环节 .本文在CIDF模型的基础上 ,提出了一个DIDS结构中的组件间通信认证策略方案     

基于Agent自适应分布式入侵检测系统

入侵检测是网络安全保护体系中的一个重要组成部分,针对目前入侵检测系统不具备自适应性的情况,该文引入了一种入侵检测系统的自适应策略,并提出一种基于Agent自适应分布式入侵检测系统.分析了各组成模块结构、功能特点以及模块之间的协作关系,并阐述了该系统设计中的信息表示及所采用的通信协议.该系统具有良好的扩展能力、自学习功能,能够实现分布式的入侵检测.     

分布式入侵检测系统和防火墙技术结合的研究与实现

对分布式入侵检测技术和防火墙技术进行了分析,提出了结合分布式入侵检测和防火墙技术的一种新方法,即：防火墙作为访问控制备设,分布式入侵检测系统作为发现入侵信号的设备,它们之间协同工作,在功能上互为补充,形成整体的合力,实现了网络安全的多层次防御．     

基于Agent的分布式人侵检测系统

入侵检测是网络安全的一个重要方面,在公共入侵检测框架的基础上,提出了基于Agent的分布式入侵检测系统,并给出了该入侵检测系统的系统模型.具有良好的分布性、可扩展性、实时响应等优点.并引入了贝叶斯推理的统计方法对检测结果进行分析,优化了系统结构,提高了检测效率.     

基于免疫接种的多代理分布式入侵检测技术研究

根据入侵检测与人工免疫机理之间的相似性,提出一种基于人工免疫系统的入侵检测分布式代理模型.该模型描述了代理在网络安全中分布式信息和安全防护的应用.提出了一种智能代理的层次式结构及动态进化模型,给出了自我集、抗原、免疫耐受、成熟代理的生命周期及免疫记忆等相应的递归公式.实验证明该模型具有较强的实时处理能力,可以有效地提高网络入侵检测的性能.     

基于数据融合的分布式入侵检测系统研究

针对分布式入侵检测在当今网络安全中发挥着越来越重要的角色,将数据融合技术引入到入侵检测系统中,提出了基于数据融合的分布式入侵检测系统设计方案,描述了分布式检测和决策融合的结构设计,讨论了数据融合决策问题的数学模型,运用理论推理论证了融合决策处理的可靠性。分析比对实验表明,该系统降低了入侵检测系统的虚警率,提高了检测率。     

校园网多层次网络安全系统的设计和实现

通过对常规网络安全体系的局限性的分析 ,全面介绍了利用多种技术手段建立校园网上多层次网络安全体系的设计思想和实现方法 ,尤其对分布式防火墙和分布式入侵检测技术进行了深入的介绍     

基于Agent的分布式入侵检测系统

随着计算机技术和Internet的飞速发展,网络安全和信息安全问题日益突出,网络上各种攻击事件不断发生,相应地各种安全措施也越来越多。而入侵检测技术正受到人们越来越多的重视。本文针对当前入侵检测系统中存在的一般性缺陷,提出了一种基于移动代理的分布式入侵检测系统的模型,实现了基于该模型的分布式入侵检测系统。     

一种智能型分布式入侵检测系统模型

在分析了当前入侵检测系统（IDS）存在缺陷及其未来发展趋势的基础上,结合高校校园网的开发工作,以高校网络为应用平台,提出并构建了一种智能型分布式入侵检测系统的模型。该模型采用分布式检测、分规则策略、动态规则链表重构、各个检测Agent即相互独立又相互协作以及系统与防火墙等其它网络安全技术相结合的措施,提供了完整的网络安全保障。     

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.     

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     

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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