基于免疫算法和支持向量机的入侵检测研究

在对网络数据分析和研究的基础上,提出了一种基于免疫算法和支持向量机的入侵检测方法。利用免疫算法对网络数据进行预处理,运用支持向量机对处理后的数据进行分类。实验表明,该方法是可行的、有效的。     

基于卷积神经网络的入侵检测算法

作为深度学习的一种有效算法,深度卷积网络已成功应用在处理图像、视频和音频等领域.通过建立一卷积神经网络模型并应用于网络入侵检测,选取的卷积核与数据进行卷积操作提取特征的局部相关性从而提高特征提取的准确度.采集到的网络数据通过多层"卷积层-下采样层"的处理对网络中正常行为和异常行为的特征进行深度刻画,最后通过多层感知机进行正确分类.KDD 99数据集上的实验表明,文中提出的卷积神经网络模型与经典BP神经网络、SVM算法等相比,有效提高了入侵检测识别的分类准确性.      

基于支持向量机和遗传算法融合的入侵检测

为了研究网络异常入侵检测问题,将支持向量机（SVM）和遗传（GA）算法融合并应用于入侵检测领域,区分正常和异常的用户行为,实现对网络系统的入侵检测.传统SVM算法易产生训练参数选择不当,难以获得较高的检测效率和分类精度等问题.针对此问题,提出了一种优化的基于SVM-GA融合的入侵检测方法,首先对网络入侵数据进行归一化处理简化输入,然后通过遗传算法对SVM训练参数进行同步优化,最后采用SVM算法对网络数据进行检测,分类识别得到网络入侵结果.仿真实验结果表明,该融合算法训练时间短、检测精度高、误报率和漏报率低,是一种有效可行的入侵检测方法.     

一种新的基于入侵检测的属性约简算法

数据挖掘和机器学习应用于入侵检测是当今的研究热点,但其中大部分算法的学习或分类时间长,制约了入侵检测的应用。将粗糙集用于网络侦听的海量数据的属性约简可以提高入侵检测速度,提高效率。提出的一个新的属性约简算法约简冗余属性,使用朴素贝叶斯分类器进行分类预测。实验表明,该方法分类准确率高、时间消耗少,能够提高入侵检测的效率。     

基于SSAE-PNN算法的网络入侵检测研究

针对常用的入侵检测算法的收敛速度慢和误报率高的问题,本文提出一种基于栈式稀疏自编码器(SSAE)和概率神经网络(PNN)的入侵检测方法.首先,使用栈式稀疏自编码器对数据进行特征提取,获得低维、深层次的特征集,从而降低检测结果的误报率;然后,使用收敛速度快的概率神经网络对特征集分类,减少了训练模型的时间.本文使用NSL-KDD数据集对模型进行验证,实验结果表明,与其他入侵检测算法相比,SSAE-PNN模型取得了更优秀的检测效果.     

基于改进蚁群算法与遗传算法组合的网络入侵检测

为提高网络入侵检测的检测效果,提出一种基于改进蚁群算法与遗传算法组合的网络入侵检测方法.该方法采用遗传算法(genetic algorithm,GA)对网络入侵的特征集进行快速选取,为后续特征提取打下基础;对传统蚁群算法(ant colony optimization,ACO)的节点选择策略和信息素更新策略进行改进,提出一种改进的蚁群算法,提高对最优特征的选择效果,采用改进的蚁群算法对特征进一步选择;采用支持向量机(support vector machine,SVM)统计机器学习方法建立各类网络入侵的检测分类器.仿真实验结果表明,新的网络入侵检测方法综合GA和改进蚁群算法的优势,能够获得更好的入侵特征,从检测正确率、误报率和漏报率3个方面综合比较,新的网络入侵检测方法具有更好的网络入侵检测效果,且提高了检测速率.     

基于自适应免疫分类器的入侵检测

由于采用传统的分类器进行检测时,存在检测率低而误报率高的问题.提出了一种基于免疫聚类的自适应分类器方法,采用多信息粒度的思想有效地克服了聚类算法与分类算法间的不一致性.通过在真实网络数据集上对多种入侵行为的检测结果表明:该分类器的检测率高、漏报率和误报率低,较RBF分类器和BP分类器具有更好的分类性能和推广性能.     

基于量子遗传算法的入侵检测器生成

入侵检测器的生成是入侵检测系统的核心,入侵检测器生成可以转化成数据的最优分类问题．量子遗传算法针对复杂优化问题有很强的搜索能力和最优化性能．因此,本文引入量子遗传算法来实现这个优化过程,并进行了入侵检测对比实验,实验结果表明基于本文算法的检测准确率高,同时收敛稳定性明显提高,收敛速度更快．     

基于量子遗传算法的入侵检测器生成

入侵检测器的生成是入侵检测系统的核心,入侵检测器生成可以转化成数据的最优分类问题．量子遗传算法针对复杂优化问题有很强的搜索能力和最优化性能．因此,本文引入量子遗传算法来实现这个优化过程,并进行了入侵检测对比实验,实验结果表明基于本文算法的检测准确率高,同时收敛稳定性明显提高,收敛速度更快．     

基于混合互信息的决策树入侵检测

为了提高入侵检测的准确度和速度,针对入侵规则属性相关性的特点,将属性与类间的互信息与属性间的互信息结合,提出了一种新的混合互信息的决策树分类算法.在对此算法进行了算法设计和分析的基础上,将由此算法构造的决策树分类方法对入侵规则进行组织,改变了传统的入侵规则逐条串行检测,以增加预处理时间为代价,提高了数据包的过滤速度和准确度.实验分析表明,应用该算法的入侵检测系统比使用传统方法具有更高的准确率和速度.     

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