CPSO和LSSVM融合的网络入侵检测

网络攻击具有多样性和隐蔽性,为了提高网络安全性入侵检测的正确率,提出一种混沌粒子群算法（CPSO）和最小二乘支持向量机（LSSVM）相融合的网络入侵检测方法（CPSO-LSSVM）。利用混沌粒子群算法对LSSVM模型参数进行搜索,选择LSSVM最优参数,采用KDDCUP99数据集对CPSO-LSSVM性能进行测试,实验结果表明,CPSO-LSSVM提高了网络入侵检测正确率,降低了误报率,可以为网络安全提供有效保证。     

基于CPSO-LSSVM的网络入侵检测

为提高网络入侵检测效果,提出一种结合混沌粒子群优化（CPSO）算法和最小二乘支持向量机（LSSVM）的网络入侵检测模型。将网络特征和LSSVM参数编码成二进制粒子,根据网络入侵检测正确率和特征子集维数权值构造粒子群目标函数。通过粒子群找到最优特征子集和LSSVM参数,同时引入混沌机制保证粒子群的多样性,防止早熟现象的出现,从而建立最优网络入侵检测模型。采用KDD99数据集进行性能测试,结果表明,该模型不仅能获得最优特征子集和LSSVM参数,而且提高了入侵检测速度和正确率,降低了入侵检测误报率和漏报率。     

基于云PSO 的RVM入侵检测

入侵检测可为计算机网络信息提供安全保障,在其方法研究中,由于相关向量机(RVM)具有高稀疏性且预测中使用概率因素,在网络入侵检测中优于支持向量机.然而RVM的核函数参数是经验估计的,为此,提出一种基于云模型的粒子群优化算法的RVM方法,即采用云粒子群算法确定RVM的核参数,构建RVM分类模型,再采用一对一分类方法进行多类检测分类.经入侵检测实验研究,所得结果表明所提出的方法优于基于常规相关向量机的检测方法,且具有更高的入侵检测精度.     

粒子群优化支持向量机的入侵检测算法

为了提高网络入侵的检测正确率,针对网络入侵检测中特征选择问题,将二值粒子群优化算法(BPSO)用于网络入侵特征选择,结合支持向量机(SVM)提出了一种基于BPSO-SVM的网络入侵检测算法。该算法将网络入侵检测转化为多分类问题,采用wrapper特征选择模型,以SVM为分类器,通过样本训练分类器,根据分类结果,利用BPSO算法在特征空间中进行全局搜索,选择最优特征集进行分类。实验结果表明,BPSO-SVM有效降低了特征维数,显著提高了网络入侵的检测正确率,还大大缩短了检测时间。     

遗传算法同步选择特征和支持向量机参数的网络入侵检测

针对入侵检测系统产生的高维数据和支持向量机参数优化问题,提出一种遗传算法同步选择特征和支持向量机参数的网络入侵检测模型。首先将特征子集和支持向量机参数编码成染色体,将网络入侵检测的分类准确率作为种群个体的适应度值,然后通过遗传算法的全局搜索能力,同步找到对分类算法最有影响的特征组合和支持向量机最优参数,最后采用KDD99数据集进行仿真实验。结果表明,该模型可以快速找到最优特征子集和支持向量机参数,提高了网络入侵检测正确率,是一种较好的网络入侵检测算法。     

PSO-SVM在网络入侵检测中的应用

为了提高网络入侵检测效果以加强网络安全性,提出一种网络状态特征和支持向量机(SVM)参数联合选择的网络入侵检测模型(PSO-SVM).以网络入侵检测正确率作为目标,特征子集和SVM参数作为约束条件建立数学模型,通过粒子群优化算法对模型进行求解,找到最优特征子集和SVM参数,利用KDD Cup 99数据集对算法性能进行测试.测试结果表明,相对于其它入侵检测算法,PSO-SVM可以找到更优特征子集和SVM参数,加快了检测速度,有效地提高了网络入侵检测正确率,为网络入侵检测提供了一种新的研究思路.     

改进蚁群算法和支持向量机的网络入侵检测

为了提高网络入侵检测的正确率,提出一种改进蚁群优化算法（ACO）和支持向量机（SVM）相融合的网络入侵检测方法（ACO-SVM）。将SVM模型参数作为蚂蚁的位置向量,采用动态随机抽取的方法来确定目标个体引导蚁群进行全局搜索,同时在最优蚂蚁邻域内进行小步长局部搜索,找到SVM最优参数,采用最优参数建立网络入侵检测模型。利用KDDCUP99数据集对ACO-SVM性能进行测试,结果表明,ACO-SVM提高了网络入侵检测正确率,降低了误报率,可以为网络安全提供有效保证。     

基于CQPSO-LSSVM的网络入侵检测模型

为了提高网络入侵检测率,提出一种协同量子粒子群算法和最小二乘支持向量机的网络入侵检测模型(CQPSO-LSSVM)。将网络特征子集编码成量子粒子位置,入侵检测正确率作为特征子集优劣的评价标准,采用协同量子粒子群算法找到最优特征子集,采用最小二乘支持向量机建立网络入侵检测模型,并采用KDD CUP 99数据集进行仿真测试。结果表明,CQPSO-LSSVM获得了比其他入侵检测模型更高的检测效率和检测率。     

改进粒子群算法和支持向量机的网络入侵检测

网络入侵检测一直是网络安全领域中的研究热点,针对分类器参数优化难题,为了提高网络入侵检测准确性,提出一种改进粒子群算法和支持向量机相融合的网络入侵检测模型(IPSO-SVM).首先将网络入侵检测率作为目标函数,支持向量机参数作为约束条件建立数学模型,然后采用改进粒子群算法找到支持向量机参数,最后采用支持向量机作为分类器建立入侵检测模型,并在Matlab 2012平台上采用KDD 999数据进行验证性实验.结果表明,IPSO-SVM解决了分类器参数优化难题,获得更优的网络入侵分类器,提高网络入侵检测率,虚警率和漏报率大幅度下降.     

基于特征选择的网络入侵检测模型

研究网络安全问题,网络入侵手段多样,特征多,存在大量不利的冗余特征,传统网络入侵检测不考虑特征冗余,检测效率和正确论低。为更一步提高了网络安全,提出一种特征选择的网络入侵检测模模型。采用粒子群算法对网络系统状态特征和支持向量机参数进行同步选择,找到最优网络入侵检测模型特征和模型参数,降低了模型的输入样本维数。仿真结果表明,改进算法可降低特征维数,消除了不利于提高检测结果的冗余特征,并提高了网络入侵检测正确率,适合于小样本、实时要求高的网络入侵检测。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate