浓缩数据立方中约束立方梯度的挖掘

约束立方梯度挖掘是一项重要的挖掘任务,其主要目的是从数据立方中挖掘出满足梯度约束的梯度-探测元组对.然而,现有的研究都是基于一般数据立方的.研究了浓缩数据立方中约束数据立方梯度的挖掘问题.通过扩展LiveSet驱动算法,提出了一个eLiveSet算法.测试表明,该算法在立方梯度挖掘效率上比现有算法要高.     

OLAP数据挖掘引擎算法的设计与实现

基于OLAP的数据挖掘，是数据挖掘的一个新的发展方向。对于如何把OLAP(联机分析处理技术)和DM(数据挖掘)统一起来，从而在数据库或数据仓库的不同层次进行挖掘，提出了OLAP数据挖掘系统的结构。通过研究数据挖掘方法和OLAP操作的特点，以及数据立方的构建和物化，对传统的DM算法进行了改进，设计并实现了更能适应OLAP数据挖掘引擎的算法。     

dmGQL：一种新的数据立方梯度查询语言

现有数据立方梯度查询语言CubegradeQL主要是针对非实例化数据立方的，实际上，为了提高OLAP查询效率，数据仓库中往往保存了大量实例化的数据立方。本文我们改进了CubegradeQL语言，给出了一个新的查询语言dmGQL，dmGQL能够支持实例化／非实例化数据立方中的梯度查询，最后，我们讨论了dmGQL的查询处理。     

基于学生评价数据立方的多维分析

许多学校的信息系统都是面向事务的,虽然积累了大量的教育数据,但不具备教育教学管理的决策支持能力。基于原有OA系统的学生数据,使用联机分析处理技术对学生数据按主题进行维度建模．采用Oracle数据库的AWM工具来实现学生数据立方的建立和多维多粒度的统计分析。     

基于Hadoop的封闭直方图立方

封闭数据立方是一种有效的无损压缩技术,它去掉了数据立方中的冗余信息,从而有效降低了数据立方的存储空间、加快了计算速度,而且几乎不影响查询性能.Hadoop的MapReduce并行计算模型为数据立方的计算提供了技术支持,Hadoop的分布式文件系统HDFS为数据立方的存储提供了保障.为了节省存储空间、加快查询速度,在传统数据立方的基础上提出封闭直方图立方,它在封闭数据立方的基础上通过编码技术进一步节省了存储空间,通过建立索引加快了查询速度.Hadoop并行计算平台不论从扩展性还是均衡性都为封闭直方图立方提供了保证.实验证明:封闭直方图立方对数据立方进行了有效压缩,具有较高的查询性能,根据Hadoop的特点通过增加节点个数明显加快了计算速度.     

一种高度浓缩和语义保持的数据立方

Quotient Cube和QC-tree试图在浓缩一个数据立方尺寸的同时,保持该数据立方蕴涵的语义,但是,前者没有语义关系的存储,后者存储的语义关系是晦涩模糊的.为此提出了下钻立方结构,首次从语义角度考虑数据立方存储,存储的不是类的内容,而是类之间的直接下钻关系.下钻立方不仅能够极大地减小数据立方的存储尺寸,而且可以清晰地表达原数据立方蕴涵的下钻语义.此外,下钻立方具有较高的查询响应性能,这一点在范围查询中表现得尤其显著.实验和分析表明,下钻立方在存储尺寸和查询响应方面明显优于QC-tree,适于用来组织和存储数据立方.     

一种快速生成最小浓缩数据立方的算法

语义OLAP技术是近来学者研究的热点之一,浓缩数据立方就是其中一种.本文设计了一个用于快速生成最小浓缩数据立方的算法SQCube.算法分两个阶段：首先利用BottomUpBST算法生成一个非最小的浓缩数据立方,然后对所得到的非最小浓缩数据立方进行后处理,把其中的所有纯BST和隐BST压缩为一条BST,从而生成一个最小浓缩数据立方.实验表明SQCube算法明显优于以往提出的同类算法MinCube.     

基于数据立方的多层关联规则的元模式制导发现

元模式制导数据恨掘是以人为中心的经式数据发掘方法,用户可以通过元模式指定其假高,从而引导数据发掘,本文提出在于数据立方结构的多层关联规则的模式制导发现方法。     

层次立方体(H-Cube)的自适应计算

多维数据立方（Cube）的计算对联机分析处理（online analytical processing，OLAP）有着极为重要的作用。针对传统的多维数据Cube计算中的不足，提出了自适应的计算方法，并给出了带有层次的Cube计算算法HCA算法。     

基于浓缩数据立方的内存实化小方的动态选择

OLAP通常使用预计算数据立方的方法提高可能的聚集查询的响应速度,在内存实化预计算的数据,可以更进一步加快响应的速度,但是受到内存空间的限制。在浓缩数据立方的环境中,动态地选择一定的数据小方在内存实化,加快响应速度,并更好地适应不同的查询模式。给出了在动态选择模型中,特定存储方式下的查询分解和响应算法。     

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.