校园无线局域网安全现状分析

随着无线局域网活动日益普及,无线局域网的安全问题正在日益成为网络安全的一个重要组成方面,这已经成为了困扰无线局域网进一步发展所需要面临和解决的重要问题。分析了当前校园无线局域网面临的主要安全威胁,并提出相应的解决思路。     

基于企业WLAN的安全性研究

由于无线局域网具有有线网络所不具备的优势,所以得到许多企业深入广泛的应用,并且增长迅速。但是无线局域网给企业带来众多便利的同时,也将信息安全问题摆在了面前。分析了无线局域网面临的安全威胁,研究了无线局域网的安全技术,重点论述了企业无线局域网的安全对策。     

WLAN在构建无线校园网中的应用研究

IEEE802.11无线局域网技术标准的不断推陈出新,使无线局域网的应用和普及达到了一个新的阶段。介绍了无线局域网WLAN的概念和相关技术,探讨了一个构建无线校园网所使用的无线局域网WLAN的方法及应该考虑的问题,该应用对高校信息化资源建设有一定的借鉴作用。     

IEEE802.11无线局域网技术及其安全性分析

随着无线技术的飞速发展和网络的普及,无线局域网得到越来越多的应用,在其快速的发展过程中,无线局域网的安全问题也日益引起人们的广泛关注。本文简要地介绍了无线局域网的基本概念和无线网络所面临的安全威胁,对无线局域网的几种主要的安全策略进行了探讨。     

WLAN市场发展与网络组网探讨

文章介绍了无线局域网的主要技术及特点,分析了无线局域网的市场应用前景,主要应用场景并指出了移动运营商在提供无线局域网应用与业务时所存在的问题,及相应优化思路探讨.     

无线局域网的安全性研究

研究了无线局域网的安全性问题。在讨论了无线局域网安全需求的基础上,介绍了无线局域网标准IEEE 802.11的三项安全技术SSID,MAC,WEP技术,尤其是WEP技术的加密算法及完整性校验算法。重点分析了802.11标准中的WEP加密技术所存在的各种缺陷。最后,指明了无线局域网安全技术今后的发展方向。     

基于SSL的VPN技术在无线局域网中的应用研究

随着无线技术的发展和网络的广泛应用,无线局域网的角色显得越来越重要。本文在分析了无线局域网特点的基础上,提出无线局域网所面临的安全威胁,然后针对无线局域网的安全技术做了深入研究。     

无线局域网浅析

随着无线网络技术的发展,无线局域网这种新的联网方式为很多单位和家庭户所采用。本文通过对无线局域网的介绍,分析了无线局域网的特点和使用的多种协议标准,重点讨论了无线局域网的结构,并且进一步探讨了无线局域网的发展前景。     

无线局域网安全研究的进展

针对无线局域网的安全问题,详述了无线局域网标准的发展过程;指出了无线局域网安全研究的必要性,阐明了无线局域网安全研究的最新进展;展望了无线局域网的发展趋势。     

家庭无线上网用户安全防卫策略

家庭用户通过组建无线局域网来访问互联网已然成为一种趋势,只是在无线局域网的背后隐藏着许许多多的网络安全问题。文章分析了无线上网所面临的安全隐患,并在此基础上提出了可行的上网安全防卫策略。     

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.