基于人工神经网络的主机安全量化评估研究

基于人工神经网络的方法对主机安全性能进行量化评估。分析了BP人工神经网络模型的网络结构及学习算法,分析了影响目标主机安全性能的可能因素,并应用BP神经网络模型对目标主机的安全性能进行样本训练及实际测试。基于人工神经网络的主机安全量化评估为评价目标主机的安全性能提供了可行的方法。     

计算机主机及网络脆弱性量化评估研究

在计算机网络安全领域，针对计算机主机及网络的脆弱性量化评估是目前的研究热点。本文提出了一种网络脆弱性量化评估方法，并在该评估方法的基础上开发出了相应的评估系统。系统通过对主机漏洞存在可能性以及漏洞利用可能性进行量化评估，得到目标主机的脆弱性度量值。在此基础上，结合网络拓扑结构，利用优化的最短路径算法，分析网络中存在的危险路径和关键结点，从而可以有针对性地进行网络脆弱性修补，增强网络的总体安全性能。     

多传感器网络信息数据融合技术研究

本文提出了多传感器网络信息数据融合技术。通过多传感器探测节点向目标主机发送探测信息,并将返回信息输入到经过大量产生式规则训练和学习的BP神经网络中,得到目标主机属性信息。然后,通过D-S证据推理对属性信息进行信任度融合处理,得到目标主机上可能存在的漏洞分布及漏洞存在的可能性,为进一步的主机安全性能评估打下基础。     

一种融合多源数据的网络安全态势评估模型

网络安全态势评估是目前网络安全领域的研究热点之一。对国内外已有的网络安全态势评估方法进行了分析和比较,提出一种融合多源数据的网络安全态势定量评估模型。同时考虑主机和链路对网络安全态势的影响,将网络安全态势指标归纳为主机安全指标和链路安全指标。采用改进D-S证据理论融合日志记录、告警信息和其他探针数据,得到精简的主机安全事件集合和链路安全事件集合。依据相应的服务信息分别计算主机安全态势和链路安全态势,实现网络安全态势定量评估。通过网络仿真软件构建网络实例,对所提出的网络安全态势评估模型进行了验证,实验结果表明该模型可以准确地对网络安全态势进行定量评估,评估结果能够客观地反映网络安全态势的变化趋势。     

融合网络安全信息的网络安全态势评估模型

提出了融合网络安全信息的网络安全态势评估模型,该模型对多源安全设备的告警信息和主机系统日志进行校验、聚集融合,从而整体上降低安全设备的误报率,然后综合告警信息威胁量化结果和网络中漏洞的脆弱性量化结果两部分信息,对网络安全进行态势量化评估。经实验证实该模型能够比较准确的反映网络安全运行态势。     

基于集对分析的网络安全态势评估

为方便管理员更为直观地观察网络安全状况以便迅速作出应变措施,提出了基于集对分析的网络安全态势评估模型。首先对各个传感器的数据进行预处理,得到服务器和攻击的规范化数据,然后利用集对分析理论融合来自多个传感器的数据得到主机的安全态势,最后采用自下而上的层次化安全态势量化评估模型,以评估网络的整体态势。通过对DARPA 2000数据集的分析,证明集对分析比传统方法更能够对网络态势所处的级别进行明确划分,更好地得出整个网络简单的安全态势。     

无线局域网安全量化评估方法与系统设计研究

无线网络的飞速发展使得网络安全的量化评估日益重要。从非授权接入的角度出发,建立了802.11b无线局域网试验环境和安全评估模型,对无线局域网的安全量化评估进行了深入分析。把无线局域网的安全量化评估分为两个部分：非授权接入后的网络入侵程度评估和在此基础上对整个网内主机安全性能的评估,给出了量化评估的方法和步骤,并介绍了系统实现流程。最后通过实例进行了安全量化评估分析验证。     

层次分析法在目标主机安全量化融合中的应用

在计算机网络安全领域，针对目标主机的安全性能分析评估是当前的研究热点。该文从分析影响目标主机安全性能的因素入手，运用层次分析法，确定安全评价指标，构建目标主机安全性能评价层次结构模型，为评价目标主机的安全性能提供了可行的方法。     

层次化网络安全威胁态势量化评估方法

安全评估是贯穿信息系统生命周期的重要管理手段,是制定和调整安全策略的基础和前提.只有充分识别系统安全风险,才能有针对性地采取有效的安全防范措施.基于IDS(intrusion detection system)海量报警信息和网络性能指标,结合服务、主机本身的重要性及网络系统的组织结构,提出采用自下而上、先局部后整体评估策略的层次化安全威胁态势量化评估模型及其相应的计算方法.该方法在报警发生频率、报警严重性及其网络带宽耗用率的统计基础上,对服务、主机本身的重要性因子进行加权,计算服务、主机以及整个网络系统的威胁指数,进而评估分析安全威胁态势.实验表明,该系统减轻了管理员繁重的报警数据分析任务,能够提供服务、主机和网络系统3个层次的直观安全威胁态势,使其对系统的安全威胁状况有宏观的了解.而且,可以从安全态势曲线中发现安全规律,以便调整系统安全策略,更好地提高系统安全性能,为指导安全工程实践、设计相应安全风险评估和管理工具提供了有价值的模型和算法.     

网络安全评估的量化研究

从安全管理制度、物理安全、主机和应用系统安全、网络和通信系统安全、安全和保障措施等方面,结合日志和统计信息、渗透性测试获取信息,建立网络安全评估模型;引入风险管理的理念,设计风险评分模型;尝试对网络安全进行量化评估。     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

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.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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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.