基于用户兴趣反馈的智能合作过滤模型的研究

随着网络信息资源的迅速增加,如何及时准确地获取所需信息是现代网络信息过滤技术需要解决的主要问题.为了给用户提供更准确的信息,提出了一种基于用户反馈的智能合作过滤模型(Agent collaborative filtering model based on users'feedback,ACFM)和用户兴趣模型,该模型通过隐式反馈和显式反馈这两种用户兴趣反馈学习实现合作过滤.实验结果表明,ACFM在预测用户兴趣的效果和推荐搜索信息的准确率方面比传统的搜索引擎有明显改善.     

基于Agent的个性化信息过滤系统的设计与实现

针对用户个性化服务的特定需求，文中提出了一种基于Agent的个性化信息过滤系统的设计思想及其实现过程。采用基于主题的过滤和基于兴趣的过滤相结合的过滤方法对信息分两次过滤，同时利用Agent跟踪用户的浏览行为，从而提供隐式反馈。系统能够根据文本的内容自动判别文本所属主题分类，并计算待过滤信息与用户兴趣之间的相关度，最后利用用户的反馈对用户兴趣模型进行更新，从而帮助用户准确获取有用信息。     

基于Agent的个性化信息过滤系统的设计与实现

针对用户个性化服务的特定需求,文中提出了一种基于Agent的个性化信息过滤系统的设计思想及其实现过程。采用基于主题的过滤和基于兴趣的过滤相结合的过滤方法对信息分两次过滤,同时利用Agent跟踪用户的浏览行为,从而提供隐式反馈。系统能够根据文本的内容自动判别文本所属主题分类,并计算待过滤信息与用户兴趣之间的相关度,最后利用用户的反馈对用户兴趣模型进行更新,从而帮助用户准确获取有用信息。     

基于本体论的信息过滤模型

信息过滤已成为当今信息技术研究的热点。主要介绍布尔模型、向量空间模型和概率模型,并分析它们各自的优点及存在的不足之处。在此基础上,提出一种新的信息过滤模型——基于本体论的信息过滤模型,阐述用户兴趣模板的构建步骤、用户相关反馈和更新算法,为基于本体的信息过滤技术提供了理论基础。     

基于混合学习策略的多Agent信息过滤系统

针对用户个性化服务的要求,给出了一种基于混合学习策略和BP神经网络的多Agent信息过滤系统实现方案。系统采用蒙特卡罗强化学习算法进行多Agent协作学习,同时运用三层BP神经网络计算用户的满意度,根据算出的满意度对用户兴趣模型进行更新。本系统中用户无须反复提供显示反馈,由Agent跟踪并记录用户的浏览行为而得到用户的隐式反馈信息,从而减轻了用户的负担。     

个性化网络信息过滤Agent的反馈评价机制

文章描述了信息过滤的作用,并介绍了一个基于Agent的万维网文档信息过滤系统。文中提出了个性化网络信息过滤Agent的结构及其实现方案,并讨论了用相关反馈评价机制更新用户兴趣模型的问题,建议用决策树从用户分类的文档集中学习用户的信息兴趣。     

基于隐式反馈的个性化信息过滤方法

如何为用户提供更为满意的、符合其个性化的信息过滤,已成为一个重要的研究课题。针对这一情况,本文提出了一个基于隐式反馈的个性化信息过滤的设计思路和实现方法即通过观察用户与系统交互的动作学习用户的兴趣,根据用户兴趣帮助用户过滤掉那些他不感兴趣的信息。并对其涉及的关键技术用户兴趣建模,文档的表示和信息的过滤等方面进行了详细描述,并对当前存在的问题进行了探讨。     

基于退火遗传算法的网络信息过滤系统研究

分析了网络信息过滤一般模型以及现有技术,研究了如何更准确地构建用户模板,提出了一种基于遗传算法的网络信息过滤系统模型,并且引入了遗传扩展操作和Boltzmann群体更新准则来改进遗传算法存在的缺点,同时给出了一种Roocchio反馈模型对用户兴趣模板进行更新和维护.实验结果表明,基于该模型设计的网络信息过滤系统能够有效实现对网络信息过滤.     

WMS:面向领域的Web信息挖掘系统

研究并实现了一个面向领域的Web挖掘系统WMS，能有效地帮助用户挖掘Web上的信息和知识，用户可以通过提交Web页面、文本文档、URLs或关键词，向系统表达自己希望获得的信息主题，系统自动学习用户对特定领域的兴趣．并依据用户对系统采集文档的反馈评估，不断自适应地调整用户兴趣模型．WMS依据用户兴趣模型，利用智能Agents，对用户感兴趣的有关信息进行搜索和过滤，并对主要相关Web站点的信息更新进行监测，利用人工神经网络和智能Agents技术，WMS对所积累的文档库进行信息和知识挖掘，并自动将新信息推荐给用户．     

基于贝叶斯后验概率和非合作博弈的推荐算法

针对传统协同过滤推荐算法推荐精度较低等问题,提出一种基于贝叶斯后验概率预测和非合作博弈的个性化推荐算法。采用文件主题模型求取用户与其参加过的所有社交活动的主题分布,利用隐含主题概率分布表征用户兴趣度,根据信任传递机制求取用户的直接信任和间接信任,形成用户间的信任度;将用户的兴趣度和信任度等隐式特征赋予合理的先验分布,利用贝叶斯后验概率预测隐式特征后的显式反馈;依据显式反馈将推荐结果转化为非合作博弈中用户效益最大化的纳什均衡求解。仿真对比实验表明,与其他三种推荐算法相比该算法的查准率至少提高了3.13%,查全率至少提高了2.62%。     

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。     

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。