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1.
黄辉郭帆  徐淑芳 《计算机应用》2013,33(12):3494-3498
多态蠕虫特征提取是基于特征的入侵检测的难点,快速提取出精确程度更高的多态蠕虫特征对于有效防范蠕虫的快速传播有着重要的作用。针对层次式的多序列匹配(HMSA)算法进行多序列比对的时间效率较低和由迭代方法提取出的特征不够精确等问题,提出了基于改进蚁群算法的多态蠕虫特征提取方法antMSA。该方法首先对蚁群的搜索策略进行了相应的改进,并将改进后的蚁群算法引入到奖励相邻匹配的全局联配(CMENW)算法中,利用蚁群算法快速收敛能力,在全局范围内快速生成较好解,提取出多态蠕虫的特征片段;然后将其转化为标准入侵检测系统(IDS)规则,用于后期防御。实验表明,改进后的蚁群算法能够较好地克服基本蚁群算法的停滞现象,扩大搜索空间,能够有效提高特征提取的效率和质量,降低误报率。  相似文献   

2.
基于SURF(Speeded UpRobust Features)特征点提取是目前比较流行的图像配准方法.本文在SURF基础上,提出一种基于分块策略的改进方法:首先采用分水岭分割法确定图像的分块数量,然后对图像进行分块,每个子块提取一定数量的特征点,以便实现特征点的均匀提取;再通过稀疏特征树法找出匹配的特征点对;最后用RANSAC算法剔除错误匹配特征点对,同时计算参考图像与待配准图像的变换关系.实验表明,该方法能够高效、快速地解决遥感图像的自动配准问题.  相似文献   

3.
随着计算机技术的不断发展,网络攻击方式层出不穷,所以网络安全成为了目前网络工作者研究的主要问题。目前网络安全研究的一种重要技术就是攻击特征自动提取技术,这种技术切入点是研究网络攻击特征数据提取算法。经过多种序列比对进行自动提取算法分析,引入一种改进算法,它能有效降低误报率,具有一定的应用价值。  相似文献   

4.
攻击特征自动提取技术是目前网络安全研究的一种重要技术.从网络现状研究人手,对攻击特征自动提取技术进行了定义以及分类,并对每一类技术进行了详细的介绍,同时列出了几种攻击特征自动提取技术,最后对目前这些技术存在不足和可能发展方向进行了阐述.  相似文献   

5.
开放式网络攻击特征库的设计与实现   总被引:5,自引:0,他引:5  
随着网络攻击的全球化,入侵检测系统要保护的不再是个别子网,而是整个的网络环境.由此,产生了对入侵检测开放式资源的迫切需求.本文的工作实现了一个开放式的网络攻击特征库系统,它包括了1200多条有效的攻击特征.本文设计并实现了用于攻击特征实时更新的攻击特征交换协议(ISEP),并描述了其中基于数字证书扣角色的访问控制技术.最后,通过Nachi蠕虫的实例说明了本特征库中攻击特征的提取方法.  相似文献   

6.
陈旖  张美璟  许发见 《计算机应用》2005,40(10):2973-2979
为解决HTTP慢速拒绝服务(SHDoS)攻击流量检测在攻击频率变化时出现的准确率降低的问题,提出一种基于一维卷积神经网络(CNN)的SHDoS攻击流量检测方法。首先,该方法在多种攻击频率下对三种类型的SHDoS攻击流量进行报文采样和数据流提取;之后,设计了一种数据流转换算法,将采集的攻击数据流转换为一维序列并进行去重;最后,使用一维CNN构建分类模型,该模型通过卷积核来提取序列片段,并从片段中学习攻击样本的局部模式,从而使模型对多种攻击频率的数据流都具备检测能力。实验结果显示,与基于循环神经网络(RNN)、长短期记忆(LSTM)网络及双向长短期记忆(Bi-LSTM)网络构建的分类模型相比,该模型对未知攻击频率的样本同样具有较好的检测能力,在验证集上的检测准确率和精确率分别达到了96.76%和94.13%。结果表明所提方法能够满足对不同攻击频率的SHDoS流量进行检测的需求。  相似文献   

7.
传统软件定义网络(SDN)中的分布式拒绝服务(DDoS)攻击检测方法需要控制平面与数据平面进行频繁通信,这会导致显著的开销和延迟,而目前可编程数据平面由于语法无法实现复杂检测算法,难以保证较高检测效率。针对上述问题,提出了一种基于可编程协议无关报文处理(P4)可编程数据平面的DDoS攻击检测方法。首先,利用基于P4改进的信息熵进行初检,判断是否有可疑流量发生;然后再利用P4提取特征只需微秒级时长的优势,提取可疑流量的六元组特征导入数据标准化—深度神经网络(data standardization-deep neural network,DS-DNN)复检模块,判断其是否为DDoS攻击流量;最后,模拟真实环境对该方法的各项评估指标进行测试。实验结果表明,该方法能够较好地检测SDN环境下的DDoS攻击,在保证较高检测率与准确率的同时,有效降低了误报率,并将检测时长缩短至毫秒级别。  相似文献   

8.
文章提出了一种基于序列比对的蠕虫特征自动提取模型,该模型针对现有蠕虫特征自动提取系统的可疑蠕虫样本流量单来源和粗预处理等问题,提出了对网络边界可疑流量和蜜罐捕获网络流量统一的聚类预处理,并使用改进的T-Coffee多序列比对算法进行蠕虫特征提取。实验分别对Apache-Knacker和TSIG这两种蠕虫病毒进行特征提取,从实验结果可以看出文章提出的模型产生的特征质量优于比较流行的Polygraph、Hamsa两种技术。  相似文献   

9.
多序列联配(MSA)是一个NP问题,为了取得一个好的联配结果,常用渐进和迭代两种方法,但渐进方法不能调整早期的错误,迭代方法面临怎样跳出局部最优的问题。该文提出了一种新的求精方法,该方法基于极值遗传算法和挖掘策略。极值遗传算法基于极值组合元素,能够减少搜索空间。易于找到全局最优解。算法实现过程中,首先用挖掘算法挖掘出已知联配中的不良序列块,然后所有的不良序列块用极值遗传算法重新联配。当初始的序列是用渐进算法联配时,新的求精方法能调整早期的一些错误,充分结合渐进和迭代算法的优点。最后算法用来自于数据库BAliBASE中数据进行了验证。  相似文献   

10.
遥感图像配准中特征点选择的高性能算法研究及其实现   总被引:9,自引:0,他引:9  
郑明玲  刘衡竹 《计算机学报》2004,27(9):1284-1289
在基于特征点的遥感图像配准过程中,特征点的自动、快速提取是影响配准精度和速度的关键.采用手工选择特征点,能够保证特征点的分布,但是自动化程度低而且耗时.该文提出了一种用于解决特征点选择的高性能算法.该算法选择的特征点分布均匀,保证了配准的精度;特征点的选择过程完全自动化,并通过并行优化进一步提高了算法的效率.  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

18.
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.  相似文献   

19.
《计算机科学》2007,34(4):148-148
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.  相似文献   

20.
正The 34th Chinese Control Conference and SICE Annual Conference 2015(CCCSICE2015)is organized by the Technical Committee on Control Theory(TCCT)of Chinese Association of Automation(CAA)and the Society of Instrument and Control Engineers(SICE)of Japan,and locally organized by Hangzhou Dianzi University(HDU).  相似文献   

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