用户认证在以太网中的实现

认证是宽带以太网实现可管理和网络信息安全的第一步。本文结合基于端口的访问控制协议———802．1x协议和身份认证中所使用的一种协议——RADIUS协议，讨论以太网环境下用户认证的实现。     

RADIUS协议的扩展应用研究

介绍了RADIUS协议的基本概念和原理,结合实际需求,指出了RADIUS协议在应用中的不足与缺陷,提出了实现扩展应用的设计方案和具体实现方法,以符合宽带环境下认证和计费的实际应用需求。     

802.1x协议在宽带接入认证中的应用

在介绍了宽带网络及其认证方式的基础上，论述了802．1x认证方式以及和其它认证技术的比较，并提出了802．1x协议在宽带接入认证中的实现方法。     

应用于IEEE802.1x的可扩展认证协议的安全分析

IEEE802．1x协议是对现行lEEE802．11协议的安全补充，lEEE委员会为IEEE802．11推出了一个安全架构，称之为RSN(Robust Security Network)。RSN利用IEEE802.lx标准来实现访问控制、认证以及密钥的管理。可扩展认证协议(EAP)是IEEE802．1x中引入的一个重要协议，该标准为基于802标准的局域网提供了一个认证的框架。文章对EAP在应用中所遇到的问题和安全隐患进行分析，并对这些问题提出了可能的解决方案。     

基于802.1x协议的RADIUS认证原理及分析

IEEE 802.1x是针对端口的认证协议,是对用户进行认证的一种方法和策略。本文简要介绍802.1x协议和RADI-US协议的基本概念和原理,对基于802.1x协议的RADIUS协议在宽带认证中的应用做了分析,给出RADIUS的工作流程并指出这种认证的优缺点。     

RADIUS协议在AAA系统中的应用研究

RADIUS协议在宽带网络认证授权计费解决方案AAA认证系统中得到了广泛应用.介绍了RADIUS协议的结构特点、报文内容、AAA系统架构和802.1x标准,讨论了RADIUS认证的工作流程,研究了RADIUS协议的认证机制以及在Linux环境下RADIUS服务器的配置方法,建立了RADIUS认证服务器的功能模型,分析了RADIUS协议所采取的安全措施以及存在的安全隐患,并对其安全性的进一步完善提出了建议.     

基于扩展802．1X和RADIUS宽带网计费系统的设计与实现

本文基于实际应用的需求，对802．1x标准和Radius协议进行了扩展应用，并设计了基于这种扩展技术的宽带网计费系统。该系统提供粒度为用户的认证接入和计费管理，支持对费用不足的用户实时断线能力，这在非扩展的情况下无法实现；并提供包月制、按时长、按流量、按协议及预付费等多种计费策略和优惠政策，能够满足电信级计费需求。     

局域网中802.1x认证方式研究与实现

802．1x协议网络认证方式是一种具有发展潜力的认证方式。本文介绍了802．1x协议在局域网认证中的工作原理和认证过程,分析了与其他认证方式的差异,并对认证过程中可能存在的问题及解决方案进行了讨论,最后给出了802．1x认证客户端在linux下的实现。     

基于802．1X的可管理、可运营宽带校园网技术研究

目前，高校校园网的应用越来越重要、规模也越来越大、功能也越来越强。但是，校园网也存在不少问题，诸如，缺乏合理的管理模式、灵活的计费策略，网络的安全及稳定得不到保障，急需一个合理的、细致的管理限制和收费手段来完善校园网，因此可管理、可运营宽带校园网成为当前高校网络建设的热点。本文对宽带IP网建设与发展过程中产生的多种认证与计费的前沿技术进行分析、比较和研究，重点介绍了802．1x协议体系结构，分析了协议的工作原理及认证机制，提出了基于802．1x协议的校园网认证计费解决方案。     

RADIUS在802.1x中的应用

在802．1x中使用RADIUS认证,可以为宽带网络提供一种安全的认证、授权、计费方案,而用户的统一认证、上网时限控制和同一账户的多人使用问题并没有被RADIUS本身所解决,使用目录树统一存储用户信息,并通过Schema扩展RadiusSimultaneous和RadiusLoginTime属性以及改进认证流程可以解决上述问题。     

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。     

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。