网络用户行为的隐私保护数据挖掘方法

隐私保护的数据挖掘近年来已经为数据挖掘的研究热点,Web网站的服务器日志保存了用户访问页面的信息,如果不加以保护会导致用户隐私数据的泄漏。针对这个问题,讨论了在Web数据挖掘中用户行为的隐私保护问题,进而提出一种将Web服务器日志信息转换成关系数据表的方法,并通过随机化回答方法产生干扰数据表项中信息,再以此为基础,提供给数据使用者进行频繁项集以及强关联规则的发现算法,从而得到真实保密的网上购物篮商品间的关联规则。经实验证明,提出的Web使用挖掘中的隐私保护关联规则挖掘算法隐私性较好,具有一定的适用性。     

基于Web日志的隐私保护关联规则挖掘方法

电子商务网站用户的每次购物会话信息会被记录在Web服务器的日志中,分析这些日志并挖掘出购物篮商品问的强关联规则,可以主动为Web终端用户提供商品推荐,优化网站服务质量.鉴于原始用户会话信息及挖掘结果的隐私保护问题,提出了一种新的数据随机干扰处理方法,即结合列置换的伪列随机化回答方法,先对原始日志信息进行变化和隐藏,然后以此为基础,给出了一种基于住逻辑与操作的高效频繁项集生成算法,进而实现了原始信息及挖掘结果均获得隐私保护的网上购物篮问题的关联规则挖掘.实验结果表明,本方法具有很好的隐私保护性、高效准确性以及适用推广性.     

分布式数据库关联规则的安全挖掘算法研究

分布式环境中,进行分布式数据库关联规则的挖掘而不泄露用户的隐私,是非常重要的问题.提出了分布式数据库的关联规则的安全挖掘算法PPDMA(Privacy Preserving Distributed Mining Algorithms),通过应用密码学方法对站点间传送的用于挖掘全局频繁项集的被约束子树及其它信息进行加密,而在接受站点对加密信息进行解密,达到不披露用户信息,起到保护用户隐私的作用,以进行关联规则的安全挖掘.分析表明,该算法是正确可行的.     

有趣Web日志关联规则挖掘算法

对Web日志关联规则挖掘算法进行了研究,普通的关联规则挖掘算法发现的规则数量太多,里面含有大量用户不感兴趣的规则,规则知识很难为用户所使用.根据网站拓扑结构和矩阵迭代技术实现了一种有趣关联规则(IMIA)算法,能够快速迭代求解任意两个页面间的关联概率,对关联规则进行有趣度评价,得出有趣度高的规则.实验结果表明,该算法是有效的,可以进一步改善网站性能,提高智能服务质量和性能,从而很好地应用到电子商务领域.     

垂直分布下的隐私保护关联规则挖掘

针对垂直分布下的隐私保护关联规则挖掘算法安全性不高和挖掘效率较低的问题,提出了一种隐私保护关联规则挖掘算法.算法采用一种新的点积协议,通过引入逆矩阵和随机数隐藏原始输入信息,具有较好的安全性;利用挖掘最大频繁项集来代替挖掘所有频繁项集,采用深度优先遍历策略,结合各种剪枝策略,明显加快了频繁项集的生成速度,大大减少计算代价.实验结果表明,挖掘效率得到了很大提高.     

分布式环境下关联规则的安全挖掘算法

提出了分布式数据库的关联规则的安全挖掘算法PPDMA，通过应用密码学方法对站点间传送的用于挖掘全局频繁项集的被约束子树及其它信息进行加密，增加“干扰”信息，在接收站点对加密信息进行解密，达到不披露用户信息的目的，起到保护用户隐私的作用，以进行关联规则的安全挖掘。分析表明，该算法是正确可行的。     

Moodle系统中微博第三方登录设计与开发

微博是一款为大众提供娱乐休闲生活服务的信息分享和交流平台,通过微博开放平台,用户可以将自己的应用、网站等服务接入微博,从而使用微博提供的丰富应用和完善服务.据官方统计,微博用户数已达5.56亿(截止至2013年3月底),活跃用户数高达5000万.将微博开发平台与Moodle系统整合在一起可以使国内用户方便、快捷地注册和登录Moodle网站,并有助于实现关联主义学习理论所倡导的社会网络化学习.介绍了Moodle系统中通过微博第三方登录功能的开发和实现,并对比了QQ、微信和微博3种第三方登录开发的异同点.     

关联规则在浏览者兴趣分析中的应用

文章讨论了关联规则、Aporioi算法、多层次关联规则以及在挖掘电子商务网站用户兴趣方面的应用,并以网站部分数据为例,应用多层次关联规则进行兴趣分析。     

用户账号分权限的社交登录隐私保护平台

社交网站引入第三方网站来丰富自身应用,增强用户体验,但同时会造成用户隐私信息泄露,甚至给用户的人身财产安全带来威胁。文章采用用户账号权限分离技术以降低用户隐私泄露风险,即用户拥有包含不同隐私信息的账号,同时这些账号对应不同的权限,默认以高权限账号（主账号）来进行社交网站的日常登录操作,以低权限账号（副账号）授权第三方应用。在不影响用户体验的情况下,该技术能实现在不同账号间的快速切换。系统不依赖于用户的警觉意识,起到了保护用户隐私的作用。     

基于共享的隐私保护关联规则挖掘

随着数据挖掘技术的广泛使用,产生了信息安全和隐私保护的新问题。对当前分布式隐私保护关联规则挖掘的经典算法进行了改进,在不使用当前流行的多方安全计算(SMC)的条件下,用较简单的方法进行隐私保护关联规则挖掘,降低了运算量。同时,在分布式关联规则挖掘的同时,很好地保持了各个站点的数据和信息。     

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     

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.     

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。