试论防火墙技术

随着Intemet的迅猛发展，安全性已成为网络互联技术中的关键问题．文章全面论述了网络防火墙安全技术和产品的分类及主要技术特征．同时简要描述了传统网络防火墙存在的不足和未来防火墙技术的发展趋势。     

浅谈网络防火墙技术

随着计算机网络的发展,网络上的信息是越来越多,而如何保证信息的安全、准确的传输和使用已不容忽视,防火墙作为网络安全的关键技术,受到越来越多的关注。本文从防火墙技术的概念和分类入手,针对防火墙的发展,探讨了防火墙的类别,对比分析了常用防火墙技术的优缺点．简单阐述了防火墙的作用。     

浅谈硬件防火墙

作为在保障网络安全方面扮演着至关重要角色的防火墙技术从出现到发展至今一直是网络安全研究中的关键技术之一,随着互联网的迅猛发展,它在信息化、网络化的过程中也变得越来越重要。为了使防火墙能快速且深入地对网络数据传输过程中的海量信息进行安全检测,并能应对来自各个网络层的威胁,将传统的基于软件的防火墙转向硬件平台实现是不可阻挡的发展趋势。     

防火墙关键技术及发展

在因特网受到外部网络攻击的情况下防火墙作为因特网最新发展技术之一,是目前实现网络安全策略最有效的工具。防火墙关键技术有包过滤技术和代理技术等。但防火墙对来自网络内部的攻击无能为力。     

网络入侵智能化实时检测系统

网络安全技术中的一个重要方面就是入侵的检测．检测入侵的实时技术是新一代防火墙中的关键技术之一．基于统计的一般实时检测方法,给出了一个基于键入特性的识别算法．采用状态索引判决树的基于规则实时入侵检测方法及实时入侵检测中的多字串快速检索算法,给出了一个应用在防火墙中的网络入侵智能化实时检测系统的实际模型和框图     

基于计算机防火墙安全屏障的网路防范技术应用初探

防火墙是计算机系统中的关键技术,由于计算机系统中存储着大量的用户信息,涉及到较多的用户隐私,防火墙中会泄露大量的用户信息,加强防火墙的信息安全成为计算机用户最为关注的问题。需要将防火墙作为计算机中的安全屏障,对计算机网络指标进行分析,对计算机防火墙安全问题进行深度的探讨,对计算机防火墙安全屏障的网路防范技术应用情况进行探讨。     

基于主机的网络防火墙技术及其实现方法

网络防火墙技术在信息安全领域中扮演着十分重要的角色，因此介绍了网络防火墙的分类及特 征，着重阐述了主机型网络防火墙的工作原理和关键技术，并结合Ms Windows操作系统给出了一些具体 实现方法。其主机型防火墙技术必将在解决信息安全方案中占据越来越重要的地位。     

基于主机的网络防火墙技术及其实现方法

网络防火墙技术在信息安全领域中扮演着十分重要的角色，因此介绍了网络防火墙的分类及特征，着重阐述了主机型网络防火墙的工作原理和关键技术，并结合MS Windows操作系统给出了一些具体实现方法。其主机型防火墙技术必将在解决信息安全方案中占据越来越重要的地位。     

计算机防火墙安全屏障与网络防范关键技术初探

计算机防火墙是计算机安全防护的保护层,对于信息网络安全起着至关重要的作用。对此,本文对计算机防火墙屏障与网络防范的关键技术进行了详细的探讨与分析,希望对计算机防火墙技术的进一步发展起到一定的作用。     

计算机网络防火墙的设置分析

随着网络技术的不断发展和普及,我们的工作和生活都随之发生了改变,网络在给我们带来便利性的同时,也带来了日益严峻的网络安全问题。防火墙技术是一种非常重要的网络安全技术,文章试图对在计算机网络防火墙技术及其在实际应用过程中的设置问题进行探讨。希望本文的研究对于防火墙技术在网络安全中发挥更为重要的促进、推动作用。     

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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