分布式系统中关联规则挖掘研究

在分布式系统中如何挖掘关联规则是数据挖掘领域研究的一个重要课题。本文对关联规则分布式挖掘问题进行探讨，给出了关联规则分布式挖掘系统DAMINER的体系结构，提出了一种基于DAMINER的关联规则分布式挖掘算法ARDM。该算法具有通信代价小和时间开销少等优点。     

基于数据概要描述的分布式数据流聚类模型与算法

数据流挖掘可有效解决大容量流式数据的知识发现问题,并已得到广泛研究.数据流的一个典型的例子是传感器采集的流式数据.然而,随着传感器网络的应用普及,这些流式数据在很多情况下是分布式采集和管理的,这就必然导致分布式地挖掘数据流的需求.分布式数据流挖掘的最大障碍是由分布式而导致的挖掘质量或者效率问题.为适应分布式数据流的聚类挖掘,探讨了分布式数据流的挖掘模型,并且基于该模型设计了对应的概要数据结构和关键的挖掘算法,给出了算法的理论评估或者实验验证.实验说明,提出的模型和算法可以有效地减少数据通信代价,并且能保证较高的全局模式的聚类质量.     

知识发现中的可继承性问题研究

提出知识发现中的可继承性问题，通过对知识发现过程和挖掘算法形式化描述和分析，抽象出各个阶段的形式联系及其约束条件，在此基础上提出初等知识的概念．在引入初等知识后，对传统的挖掘算法、增量式挖掘算法、可继承性挖掘算法进行形式化描述和比较，得出如下结论：可继承性挖掘算法能够有效的提高数据集变化、参数变化情况下的数据挖掘效率．     

分布式关联规则挖掘中的聚类分区算法

在分布式关联规则挖掘中，首先需要解决分布式环境下的聚类分区问题。该文基于CURE的工作原理，提出了D-CURE算法。实验证明，D-CURE算法可以很好地解决在分布式环境下的聚类分区问题。     

基于频繁模式树的分布式约束性关联规则挖掘算法研究

在分布式环境中挖掘约束性关联规则是当前研究的热点问题之一。该文在FP-growth算法的基础上,提出了一种新的分布式挖掘约束性关联规则算法DAMICFP。该算法对于解决分布式挖掘约束性关联规则的问题是十分有效的。     

基于Kerberos分布式防火墙技术研究

随着计算机网络技术的迅猛发展和Interilet／Intranet用户数量的激增。以及新型网络服务的研究、实施和应用。计算机网络安全问题日益突出。使得计算机安全问题成为影响计算机互连网络进一步发展的一个重要因素。以往采用的安全保护中使用的最多的是传统的防火墙机制．可是随着网络技术的不断发展。传统的防火墙已经逐渐不能．满足安全的需要：本文针对传统防火墙所带来的问题。提出了一种基于Kerberos认证的分布式防火墙的新型体系结构，在保留传统防火墙优点的基础上．以Kerberos协议为主要基础，综合网络安全软件算法合理运用防火墙相关知识，实现内部网安全分布式防火墙系统，解决了传统防火墙的安全隐患。为众多内部网络用户的需要重点保护的网络资源提供一个可管理的、分布式的安全网络环境。     

改进的分布式关联规则安全挖掘算法

以往各种分布式数据挖掘隐私保护算法无法有效解决串通问题,从而限制了其大规模应用,针对上述问题,在Clifton分布式关联规则安全挖掘算法的基础上,提出AKCA算法。采用各站点联合建立并求解方程组的安全多方求和方法。结果证明经过改进的算法能够抵御串通攻击,不借助签名验证也能发现恶意篡改。     

一种基于关键点的时间序列聚类算法

隐私保护数据挖掘是在不精确访问原始数据的基础上,挖掘出准确的规则和知识。针对分布式环境下聚类挖掘算法的隐私保护问题,提出了一种基于完全同态加密的分布式聚类挖掘算法(FHE-DK-MEANS算法)。理论分析和实验结果表明,FHE-DK-MEANS算法不仅具有很好的数据隐私性,而且保持了聚类精度。     

分布式环境下挖掘约束性关联规则的算法研究

关联规则是数据挖掘的重要研究内容。基于约束的关联规则挖掘可以促进交互式探查与分析。该文主要研究了分布式环境中挖掘约束性关联规则的问题。在并行关联规则挖掘算法CD和约束性关联规则挖掘算法Direct的基础上,提出了一种新的分布式挖掘约束性关联规则算法DMA_IC。该算法对于解决分布式挖掘约束性关联规则的问题是十分有效的。同时,文章还对DMA_IC算法的通信性能进行了讨论。     

Web挖掘技术综述

随着Internet的迅速发展与广泛应用，Web成为一个巨大的、蕴涵着具有潜在价值知识的分布式信息空间，为数据挖掘研究提供了丰富的数据源，同时也提出了新的挑战。该文首先概述了数据挖掘的概念、挖掘算法及其主要应用领域，然后详细阐述了Web内容挖掘、Web结构挖掘和Web日志挖掘的概念和主要的挖掘算法及最新研究进展，最后介绍了Web挖掘的研究方向和发展趋势。     

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.