保护节点资源的Ad Hoc网络DOS攻击防御机制

移动ad hoc网络由于其动态拓扑、无线信道以及各种资源有限的特点,特别容易遭受拒绝服务(DOS)攻击.在分析传统防御机制的基础上,提出了移动ad hoc网络中一种新的DOS攻击防御机制--基于优先级和缓存控制,着重保护节点的资源.     

基于能量预测的传感器网络信任机制研究

信任机制最近已建议作为一个无线传感器网络(WSNs)有效的安全机制.文中提出了一种信任机制(EPTM),该机制不仅可以防止被入侵的节点或者恶意节点选举为簇头,而且还设计出一种新型副簇头节点来监察簇头以防止他们的恶意行为.特别介绍了一种基于能量预测的方法来检测拒绝服务攻击(DoS)的节点,选出值得信赖的簇.最后通过仿真验证了机制的可行性,结果表明:EPTM可以有效防御拒绝服务(DoS)攻击.     

基于流量预测的传感器网络拒绝服务攻击检测方案

在无线传感器网络中,如何准确和迅速地检测拒绝服务攻击,以保障网络设施的可用性,是一个极具挑战性的安全问题.文中采用线性预测技术,为传感器节点建立了简单高效的ARMA(2,1)流量预测模型,进而为传感器网络设计了一种基于流量预测的拒绝服务攻击检测方案--TPDD.在该方案中,每个节点独立地完成流量预测和异常检测,无须特殊的硬件支持和节点之间的合作;为了提高方案的检测准确度,提出了一种报警评估机制,减少预测误差或信道误码所带来的误报.模拟实验结果表明,ARMA(2,1)模型具有较高的预测精度,能够实时地预测传感器网络流量;TPDD方案能够在较少的资源开销下,迅速、有效地检测拒绝服务攻击.     

基于博弈理论的传感器网络拒绝服务攻击限制模型

如何有效防治无线传感器网络中的拒绝服务(Denial of Service,Dos)攻击,以保障网络设施的可用性,是一个极具挑战性的安全问题.本文在假设网络节点为理性的基础上,提出了面向重复博弈的DoS攻击限制模型.该模型通过建立攻击检测惩罚机制,来降低攻击者的攻击收益以敦促恶意节点的协作,使传感器网络最终达到一个协作的Nash均衡.仿真结果表明,通过合理选择惩戒机制参数,可以有效抵御传感器网络中的DoS攻击.     

基于检测投票机制的无线传感器网络DoS攻击检测方案

针对如何准确地检测无线传感器网络中的拒绝服务攻击问题,在局部监测理论的基础上,通过采用检测投票机制,设计出一种可以有效检测拒绝服务攻击的安全路由协议,为了提高方案的检测准确度,提出一种报警评估机制,减少预测误差带来的误报。模拟实验结果表明,新方法具有较高的预测精度,能及时有效地检测出恶意攻击节点并隔离该节点,保证网络的正常工作．     

基于拍卖针对DoS攻击的WSN安全路由协议

节点密度大、数量规模大以及资源有限是无线传感器网络的特点,而又使得它难以防御恶意节点发起的拒绝服务攻击。针对无线传感器网络的以上特点,基于博弈论观点和方法,通过建立传感器网络节点博弈框架,采用一级封闭价格拍卖实现路由发现,利用声誉机制检测和惩罚恶意节点,并在SAR协议基础上增加了对黑洞攻击和重放攻击的防御,加快了对恶意攻击节点的检测收敛。仿真结果表明,改进后的SAR协议能有效防御无线传感器网络中的拒绝服务攻击。     

基于Markov的无线传感器网络入侵检测机制

本文采用Markov线性预测模型,为无线传感器网络设计了一种基于流量预测的拒绝服务攻击检测方案——MPDD。在该方案中,每个节点基于流量预测判断和检测异常网络流量,无需特殊的硬件支持和节点之间的合作;提出了一种报警评估机制,有效提高方案的检测准确度,减少了预测误差或信道误码所带来的误报。仿真实验结果表明,Markov模型具有较高的预测精度,能够实时地预测传感器网络流量;MPDD方案能够快速、有效地检测拒绝服务攻击且消耗资源较少。     

抵御虫洞攻击的无线传感器网安全定位算法

节点定位技术是无线传感器网络的支撑技术之一,节点位置信息是很多基于无线传感器网络的应用的基础.无线传感器网络是一个动态的网络,每隔一段时间需要进行重新定位,并且在重定位过程中易受到攻击节点攻击.针对无线传感器网络中无需测距的定位技术,分析虫洞攻击对DV-Hop定位的影响,提出了一种基于信誉模型的抵御虫洞攻击的分布式轻量级DV-Hop安全定位算法TMDV-Hop(Trust-Model-based DV-Hop Localization Against Wormhole Attack).仿真表明,在无需额外硬件辅助下,TMDV-Hop算法能有效降低虫洞攻击对定位过程的影响,验证了该算法的有效性.     

无线传感器网络环境下的攻击防御方法

传感器节点大多部署在非受控区域,无线信道的广播特性和自组织的组网特性都使得传感器网络容易受到攻击;同时传感器网络作为一种耗尽型网络,能源非常有限,系统功能极易受到拒绝服务攻击。文章结合作者的研究,介绍了两种无线传感器网络环境下网络攻击的防御方法。     

基于多元分类的无线传感器网络恶意节点检测算法

无线传感器网络是一个暴露在开放环境中的分布式网络,各节点之间相互独立,缺乏中心节点和监控节点,极易受到恶意节点的攻击.为了对无线传感器网络中的大量传感器节点进行恶意节点检测,提出了一种基于多元分类的恶意节点检测方法.提出的检测方法是在已知少量传感器节点类型的前提下,抽取与已知恶意节点类型相关的传感器节点属性,建立关于全...     

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