基于行为模式识别的反垃圾邮件技术

分析邮件传送机制及传统反垃圾邮件技术，对基于行为模式识别的垃圾邮件处理技术技术进行了建模与处理流程描述，对发送垃圾行为进行了分类，针对不同行为做到了从源头上，原理上控制垃圾邮件的传播。研究分析认为，将行为模式识别技术应用于垃圾邮件的处理有主动性和精确性的优点。     

反垃圾邮件个垒打

近两年来，垃圾邮件大量泛滥，不断改头换面，以躲避过滤，魔高一尺；反垃圾邮件技术推陈出新，增强智能别技术，道高一丈。令人汗颜的是，垃圾邮件与病毒为伍，让传统反垃圾邮件技术措手不及。随着安全技术介入，垃圾邮件再次败下阵来。但战争并未结束，垃圾邮件时刻积续力量，准备反攻。俗话说，知己知彼，百战不殆。如若防范垃圾邮件，必须知晓垃圾邮件入侵的突破口，以及恰当的过滤手段。事实上，客户端和邮件服务器是垃圾邮件传播和落脚的根据地，如若横扫“垃圾”，必须直击客户端和邮件服务器。客户端主要靠个人用户维护，邮件服务器端则靠网管维护。现在，我们从这两个角度，讲一讲防范垃圾邮件全套攻略。     

反垃圾邮件技术

电子邮件作为目前在Internet上使用最广泛的服务，近年来日益受到垃圾邮件的威胁。众多的垃圾邮件最终将流向我们每一个电子邮件用户，极大地影响了电子邮件的使用效率。垃圾邮件之所以泛滥，原因在电子邮件系统本身在安全方面存在一些漏洞。当前已经有许多比较成熟的反垃圾邮件技术，其中的一些已经投入实用。本文将解释垃圾邮件的成因，并介绍一些主要的反垃圾邮件的技术，最后介绍一种新的类似于垃圾邮件的有害信息传播方式。     

对垃圾邮件过滤技术的问题研究

近年来,电子邮件方便人们的生活,同时,也有大量的垃圾邮件不断涌现,随之也出现了各种垃圾邮件过滤技术。文中主要介绍基于信件源垃圾邮件过滤技术和基于内容的垃圾邮件过滤技术,通过对这两种技术的介绍,分析了垃圾邮件过滤技术的优缺点,并对垃圾邮件过滤技术中存在的问题进行了讨论。垃圾邮件发送者不断改变发送策略以逃避过滤技术的过滤,垃圾邮件发送策略也不断的更新。文中对近年来垃圾邮件发送的新策略进行了详细的阐述,讨论目前垃圾邮件过滤技术研究中遇到的问题和挑战。     

垃圾邮件过滤技术的发展与现状

电子邮件随着Intemet的发展给人们带来了方便，随之而来的垃圾邮件却给人们带来无尽的烦恼。本文针对反垃圾邮件技术发展与现状，对目前已应用或正在研究的垃圾邮件过滤技术进行了分析，为项目组改进垃圾邮件过滤方法的下一步工作做前期准备。     

垃圾邮件过滤技术研究综述*

垃圾邮件过滤是一种主动安全防御技术。首先概述了垃圾邮件过滤的发展历史及其基本概念;然后根据不同的标准对垃圾邮件过滤技术进行了分类,并评述了各种垃圾邮件过滤方法和技术;最后展望了垃圾邮件过滤技术及其产品的发展方向。     

垃圾邮件过滤技术的研究

对垃圾邮件的定义、主要危害、滥发原因以及对垃圾邮件过滤技术的主要方法进行了研究，分析了过滤技术在反垃圾邮件中的作用.     

一个基于Naive Bayesian垃圾邮件过滤器的改进

近几年来，垃圾邮件成为互联网的公害之一。现有的反垃圾邮件技术中，基于统计方法的Naive Bayesian分类算法在垃圾邮件过滤中有很好的效果。文中简单介绍了Naive Bayesian分类算法，提出了一种旨在提高垃圾邮件过滤精确率的改进方案，并给出了实验结果。     

一种互联网垃圾邮件综合过滤方案

垃圾邮件是互联网上亟待解决的问题。介绍了几种典型的垃圾邮件过滤技术，提出了一种结合邮件过滤和病毒检测技术、可以个性化定制过滤需求的综合过滤方案。相比于已有的方案，文中提出的方案具有同时检测病毒、过滤垃圾邮件和个性化过滤的优点，可以更加有效地鼹决邮件安全和个性化过滤的问题。     

基于行为的垃圾邮件过滤技术研究

现今社会发展已进入至一个全新的阶段——互联网时代。在互联网时代，电子邮件的使用率呈现出逐渐上升的趋势，相应的垃圾邮件的数量也在逐渐增多，给人们的工作带来了一定的阻碍。文章首先对垃圾邮件过滤技术进行了阐述说明，之后运用以行为为基础的过滤技术进行了着重分析研究，以此帮助有效解决垃圾邮件泛滥此成灾的问题。     

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.