基于BP神经网络的信誉欺骗检测模型

在分析信誉系统评价的目标系统的行为特征的基础上,提出了一种集成的BP神经网络模型.该模型使用训练集对构造好的BP神经网络进行训练,将测试集输入到训练好的BP神经网络中,进行欺骗检测,并在行为维度上进行欺骗检测效果验证.实验结果验证了基于BP神经网络的信誉欺骗检测模型的可行性.基于BP神经网络的欺骗检测模型能够快速、准确地实现欺骗行为的检测.     

ARP欺骗分析及快速防御机制的建立

近年来ARP欺骗对校园网或企业内部局域网造成了巨大的安全威胁,由于ARP欺骗利用了ARP协议自身的缺陷,这也使得防御ARP欺骗更为棘手.通过对ARP协议分析及ARP欺骗分析,对比传统防御ARP欺骗的手段,提出了更为快速、高效、自动化的防御机制,并给出了此防御机制的模型以及技术实现要点.     

基于PVLAN技术的局域网ARP欺骗防范技术研究

从分析ARP 协议入手,介绍了ARP 欺骗技术的基本原理,并在此基础上提出了采用PVLAN 技术来防范局域网内的ARP 欺骗的措施.     

ARP 协议欺骗原理分析及防范措施

本文介绍了ARP协议的基本原理与基本工作过程,由于ARP协议自身存在的缺陷,成为木马病毒进行网络欺骗行为之一.通过分析木马病毒的ARP欺骗原理,查找被ARP欺骗源头主机,提出防范木马病毒的ARP欺骗攻击措施.     

面向中文文本的欺骗行为检测方法研究

随着网络应用的扩展,个人或组织会收到或存储越来越多的信息,计算机中介通讯中时刻有大量的文本信息传输,然而人们仍然没有提出有效的办法识别其中的欺骗信息,因此,提出一种能自动检测欺骗的方法是非常迫切的.由于目前关于中文欺骗语料库仍少相关报道,因此文章基于两个步骤实现,首先建立欺骗性语料库,然后通过对欺骗性语料和非欺骗性语料的分析,提出一种基于分类的欺骗行为检测方法.实验结果显示开放测试系统的精确率、召回率和F一值分别可达到78.3%、72%和0.75.     

校园网络ARP协议欺骗的检测与防御

校园网络作为网络的典型应用,处于一个不可替代的位置。然而,利用TCP/IP协议安全漏洞进行欺骗攻击是目前校园网络中经常出现的攻击方法。攻击者通过对主机的ARP欺骗,以达到对被攻击者的限制。本文通过ARP协议原理分析及工具软件检测,对ARP协议欺骗揭示,并给出相应的防御方法。网络维护实践证实了该方法是有效的。     

ARP欺骗防范与追踪

论述了ARP欺骗的特征,分析了ARP欺骗产生的原理,并根据长期的实践经验,总结了一套ARP欺骗防范与追踪的策略。     

校园网内ARP欺骗的防范措施

介绍了ARP协议,ARP协议的工作原理以及APR欺骗的原理,最后提出了了如何使用H3C教育网专用交换机对ARP欺骗进行防治.     

网络欺骗在网络安全中作用的分析

论述了网络欺骗技术在网络安全领域的重要性，以及把网络欺骗与防火墙、ID6结合起来保护网络的基本思想．将网络攻击归纳为两种攻击模型，在此基础上，分别从对攻击的预防、检测和响应三个方面讨论了不同网络欺骗技术的作用．提出了网络欺骗效果的评价指标和攻击者系统接触时间的概念，并进行了试验和分析．     

基于PCA的过程控制系统欺骗攻击研究

针对控制系统所面临的信息安全威胁,开展了工业过程控制系统欺骗攻击研究.把欺骗攻击与过程故障都看作引起系统工作状态异常的诱发因素,统一用故障检测的方法加以检测.首先建立了欺骗攻击模型,接着开发了TE过程控制器在环模拟系统,在该仿真系统上对三个欺骗攻击场景利用主元分析统计监控算法进行异常检测.结果表明,传统的故障检测算法在欺骗攻击中漏检率和误报率明显增加.     

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     

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