基于深度学习和三支决策的DDoS攻击检测算法

针对软件定义网络(Software Defined Ntwork,SDN)中的分布式拒绝服务(Distribute Denial of Service,DDoS)攻击检测的方法少、现存方法入侵检测率低的问题,提出了一种基于深度学习和三支决策的入侵检测算法.首先使用深度信念网络对SDN的流表项进行特征提取,然后利用基于三支决策理论的入侵检测模型进行DDoS攻击的入侵检测,对于正域和负域的数据直接进行分类,对于边界域中的数据使用K近邻算法重新进行分类.仿真实验结果表明,与其他入侵检测模型相比,所提算法的入侵检测效率更高.     

一种改进的深度信念网络算法

为了找到更合适的网络激活函数,来进一步提高深度信念网络算法的非线性逼近能力和性能,本文提出了一种基于径向基函数的深度信念网络算法.该算法将径向基函数引入其中,作为其激活函数,同时利用对比分歧的方式对激活函数的重点变量(中心、宽度、权值)进行了优化和调整.然后,设计了人脸识别预测实验和洛伦兹序列预测实验来对本文算法进行验证,人脸识别预测实验使用了比较权威的户外脸部检测数据库LFW.实验结果表明,本文所提出的算法在性能、预测准确率方面优于传统方法,同时具备可行性.     

基于DBN的入侵检测分类模型构建和优化方法

在深度信念网络(Deep Belief Network,DBN)应用于图像、视频等领域中,研究者们普遍通过实践经验设置DBN基本网络结构—DBN深度及每层神经元的个数.将DBN模型作为入侵检测分类模型,提出了DBN模型中基本网络结构的适应度标准,利用该标准提出了一种用于寻找DBN优化网络结构的改进粒子群优化算法.算法首先利用鱼群思想优化粒子群优化算法搜索初始优化网络结构,然后将初始优化网络结构作为利用滑动窗口优化粒子群算法的初始值,继续寻优直到找到全局优化网络结构.将优化算法构造的DBN模型作为入侵检测分类模型进行实验,实验结果表明,相较其它优化算法,方法显著提高了入侵检测分类准确率,明显降低了入侵检测误报率和检测时间,是一种高效且可行的入侵检测分类模型构建和优化方法.     

基于深度级联模型工业安全帽检测算法

在工业生产中,安全帽对人体头部提供了较好的安全保障。在现场环境中,检验施工人员是否佩戴安全帽主要依靠人工检查,因而效率非常低。为了解决施工现场安全帽检测识别难题,提出一种基于深度级联网络模型的安全帽检测方法。首先通过You Only Look Once version 4 (YOLOv4)检测网络对施工人员进行检测;然后运用注意力机制残差分类网络对人员ROI区域进行分类判断,识别其是否佩戴安全帽。该方法在Ubuntu18.04系统和Pytorch深度学习框架的实验环境中进行,在自主制作工业场景安全帽数据集中进行训练和测试实验。实验结果表明,基于深度级联网络的安全帽识别模型与YOLOv4算法相比,准确率提高了2个百分点,有效提升施工人员安全帽检测效果。     

基于深度长短时记忆网络的多支路串联故障电弧检测方法

针对低压配电系统中,实际配电网负载端的负载串并联形式的多样化和多变性特点,研究干路点检测支路发生的故障电弧具有十分明显的实际意义,提出了一种基于深度长短时记忆(LSTM)网络的多支路串联故障电弧检测方法.首先,构建实验平台,采集支路发生不同串联故障情况下的干路电流信号共计72000组;然后,将电流信号分为训练集和测试集;最后,通过Python平台优化深度LSTM网络模型结构以识别故障电弧,并输出检测结果.实验结果显示改进的LSTM网络对于每组实验单独分类检测准确率最低为96.8％,最高可达99.0％,多组实验统一进行检测准确率达94.88％.该方法能够有效识别多支路负载下的串联故障电弧,为低压串联故障电弧的准确检测提供了新的思路和有益探索.     

基于深度信念网络的高维传感器数据异常检测算法

越来越多的物联网数据呈现高维度特征,针对目前传感器数据异常检测算法对高维数据在线检测的困难,提出一种基于深度信念网络的高维传感器数据异常检测算法。首先利用深度信念网络对高维数据进行特征提取,降低原始数据维度,再对降维后的数据进行异常检测。在检测过程中将QSSVM(Quarter-Sphere Support Vector Machine)与滑动窗口模型相结合,实现了在线式的异常检测。通过在四组真实传感器数据上的大量实验,与先前的异常检测算法做了对比,实验结果表明,新算法相对于OCSVM(One-Class Support Vector Machine)仅利用原有算法50%的计算时间,将检测准确度提高了约20%。     

基于局部二值模式和深度学习的人脸识别

针对人脸识别中深度学习直接提取人脸特征时忽略了其局部结构特征的问题,提出一种将分块局部二值模式(LBP)与深度学习相结合的人脸识别方法.首先,将人脸图像分块,利用均匀LBP算子分别提取图像各局部的LBP直方图特征,再按照顺序连接在一起形成整个人脸的LBP纹理特征; 其次,将得到的LBP特征作为深度信念网络(DBN)的输入,逐层训练网络,并在顶层形成分类面; 最后,用训练好的深度信念网络对人脸样本进行识别.在ORL、YALE和FERET人脸库上的实验结果表明,所提算法与采用支持向量机(SVM)的方法相比,在小样本的人脸识别中有很好的识别效果.     

SDN环境下基于DBN的DDoS攻击检测

软件定义网络(SDN)作为新型网络架构模式,其安全威胁主要来自DDoS攻击,建立高效的DDoS攻击检测系统是网络安全管理的重要内容.在SDN环境下,针对DDoS的入侵检测算法具有支持协议少、实用性差等缺陷,为此,提出一种基于深度信念网络(DBN)的DDoS攻击检测算法.分析SDN环境下DDoS攻击的机制,通过Mininet模拟SDN的网络拓扑结构,并使用Wireshark完成DDoS流量数据包的收集和检测.实验结果表明,与XGBoost、随机森林、支持向量机算法相比,该算法具有攻击检测准确性高、误报率低、检测速率快和易于扩展等优势,综合性能较好.     

基于深度信念网络的民航发动机状态监测

民航飞机发动机设备构造精密、复杂,其监测系统收集的数据中蕴含了丰富的故障信息;传统发动机状态诊断依靠数据统计分析和机器学习模型,但其在深入理解与归类信号特性方面的表现难以尽如人意;此外近年兴起了多层神经网络降维算法——深度学习理论,其通过模拟人脑分析过程建立由浅入深的算法模型,数据处理效果较好;将民航发动机自身特点与深度学习理论有机结合提出了基于深度信念网络发动机状态监测方法;其优势在于克服了传统方法人工提取数据特征的不确定性与状态分类陷入局部最优的缺陷,可对发动机参数进行自主学习与特征提取;实验结果表明该算法具有出色的特征提取能力与分类准确率,能够准确识别发动机的不同状态。     

结合深度信念网络与支持向量机的地表分类算法

由于支持向量机(Support Vector Machine,SVM)在高维度、非线性等情况下仍具有极高精确性故而被广泛应用于地形识别领域研究。在复杂的地形环境以及数据的不平衡等环境下,SVM可能会因为缺少较强的鲁棒性导致分类结果并不理想。论文以提高复杂地形环境下分类算法精确度为目的,在研究了深度信念网络(Deep Belief Network,DBN)[1]与支持向量机(Support Vector Machine,SVM)的基本理论并进行有效结合后应用于地形识别领域。算法大致为将地形图片通过初始构建的深度信念网络结构对训练集进行训练进而优化重构网络结构,并通过测试集验证网络结构的有效性。在OUTEX数据集上的实验结果表明该算法对比地形分类算法中的SVM、GEPSVM等算法有更高的分类精确性。     

Only connect: teaching, technology and telesis

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.     

European Community policy and the market

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.     

一种自适应子融合集成多分类器方法

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。     

Avoiding semantic and temporal gaps in developing software intensive systems

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.     

Designing economic np control charts: A programmed simulation approach

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.     

The development of robot art

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     

Explanation and prediction: an architecture for default and abductive reasoning

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.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。