基于机器学习模型的大数据挖掘优化算法

大数据分析的方法有很多,借助机器学习模型对大数据进行挖掘优化是现今较为有效的方法。基于此,笔者提出基于机器学习模型的大数据挖掘优化算法,以机器学习技术为基础,建立分布式挖掘模型,通过计算数据相异度,完成数据挖掘中心的优化。实验结果表明,本设计算法在总计算量和预测准确度上均胜于传统算法,证明了方法的有效性和实用性。     

机器学习在数据预处理中的应用研究

互联网环境下的数据信息量日趋增多,增加了数据挖掘的难度。为了更好地对数据信息进行挖掘和提取,可以引入机器学习的技术和方法,构建基于机器学习的K-means聚类算法和数据预处理相结合的框架。本文以校园一卡通消费数据为研究对象,结合数据信息的特征和规律,对数据信息进行脱敏处理、清洗、规约和集成等操作,进一步对数据进行整合和优化,较好地实现数据挖掘价值的最大化。     

基于信息熵的网络流异常监测和三维可视方法

通过分析网络流量可以反映网络运行情况,挖掘异常行为,感知网络安全态势。为了监测网络运行状况和流量异常情况,提高用户对网络流量态势的感知体验,针对大规模网络流量的数据量大和维度广的特点,提出了一种准实时流量数据报出机制,设计了基于三维可视化的流量监测系统,并结合基于信息熵的流量异常挖掘方法,通过人工监测和数据挖掘,实现了异常流量可视化监测,提高了异常检测成功率。给出了监测系统的设计方案和实现结果,解决了网络数据流从抽象到具象的可视化问题,提供了一种更加直观的态势展现方案,提高了用户对网络态势的感知认识能力。     

网络数据获取系统用户端软件开发

网络数据获取系统是一个对海量网络数据实时获取以进行网络安全事件监测分析的大型系统,每个用户使用网络数据获取系统都需要通过一个用户端系统进行.以Visual C 为开发环境,开发了一个这样的用户端系统.系统制作、封装监测条件并向网络数据获取系统提交,获得监测数据并解析、存储,用户对数据进行处理,实现了对网络安全事件的分析监测.     

高维数据挖掘在入侵检测中的应用

本文讨论一种在数据挖掘的基础上的入侵检测系统的构建,建立了高维数据挖掘和分类的挖掘引擎,利用数据挖掘的方法从大量的攻击数据中提取有攻击行为的特征,并用于监测,实现知识的自动获取和学习。     

用户行为异常检测在安全审计系统中的应用

提出一种基于数据挖掘的用户行为审计方法,通过对正常审计数据进行分类预处理获取其他传统方法容易遗漏的正常模式,结合使用关联规则以及序列模式挖掘技术对用户行为进行模式挖掘,根据模式相似度比较来检测用户行为的异常。将此方法应用于实际的安全审计系统,得到了较好的效果。     

基于机器学习的智能汽车决策系统

设计了一个基于机器学习的智能汽车决策系统,旨在结合数据分析与机器学习可以判断出汽车整体的行驶状态,并对汽车异常状况做出自动修正,让道路安全得到有效保障.系统将采用随机森林算法进行机器学习,结合MPU-6050传感器组获取的数据,对所处道路环境做出准确、及时的判断,避免因道路信息不完整而造成不可衡量的损失.     

基于Web访问信息挖掘的商业智能发现研究

针对Web访问信息的特征和现有数据挖掘方法的局限性,提出将传统数据挖掘算法改进后扩展应用于电子商务环境,实现对Web访问信息进行深层次分析以获取商业智能的思路,从实际应用的角度设计了一个基于Web访问信息挖掘的应用模型,给出了若干关键技术实现的方法,并用改进后的FP-growth算法对电子商务客户访问数据进行兴趣关联规则挖掘实验,验证了挖掘模型的可行性和有效性.     

一种基于信息熵的异常数据挖掘算法

信息熵是粒计算理论中度量不确定信息的重要工具之一, 已有的异常数据挖掘算法主要针对确定性的异常
数据挖掘, 采用信息熵度量不确定性数据进行异常数据挖掘的研究报道较少. 鉴于此, 在引入信息熵概念的基础上,
定义基于信息熵的异常度来度量数据之间的异常程度, 并提出基于信息熵的异常数据挖掘算法, 该算法可有效进行
异常数据的挖掘. 理论分析与实验结果表明, 所提出算法是有效可行的.

     

链路失衡干扰下网络流量异常点挖掘仿真

网络数据中心流量的异常会占用大量的带宽资源,且数据流量具有多样化特征,尤其当网络链路流量失衡时,通过部署监测软件获取的节点信息已经无法实时监控流量状态。为此提出链路失衡干扰下网络流量异常点挖掘方法。利用卷积神经网络自编码器对网络流量去噪,有效控制链路失衡对流量数据挖掘的影响。通过对比正常流量点与异常流量点提取网络流量特征,结合马氏距离到改进的自编码神经网络系统中挖掘网络流量异常点。实验结果表明,研究方法的网络流量异常点挖掘准确率可稳定在90%以上,F1值始终高于0.8,误报率不高于0.5%。     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.