虚拟局域网(VLAN)的安全和管理综述

过去常常在网络里使用路由器和集线器,而现在很多网络使用交换机,虚拟局域网技术成为当今主流局域网解决方案之一,本文将针对虚拟局域网这一问题进行讨论,主要涉及VLAN的安全与管理。     

虚拟桌面技术在教育环境下的应用研究

阐述了虚拟桌面技术的定义、特点及应用发展,分析了在教育环境下的应用优势,该技术能很好适应教学环境多样化需求,为机房管理员提供非常大的便利。但由于网络环境及配置等问题,虚拟桌面技术在使用过程中也会遇到一些问题,本文总结归纳了现阶段虚拟桌面技术应用过程中的一些问题,并针对这些问题给出了实际可行的解决方案,以期能使虚拟桌面技术更好为教育工作服务。     

虚拟网络技术在计算机网络信息安全中的应用价值研究

随着信息时代和数字化社会的发展,计算机网络信息技术在各个工作领域普及,在人们的生产生活中成为不可或缺的一部分,同时计算机网络的安全问题也面临了巨大的挑战.虚拟网络技术是解决计算机网络信息安全的关键内容,在安全问题上具有可靠性,在信息延展上具有方便性,并且使用成本低.本文通过对虚拟网络技术的简单介绍,概述其特点和优势,分析虚拟网络技术在计算机网络信息安全中应用的价值.     

单方案实现端到端安全——诺基亚推出虚拟安全域系统

6月30日获悉,诺基亚公司宣布推出诺基亚虚拟安全域系统(MultipleDomainSecurity)。这是CheckPoint软件公司和诺基亚公司共同提供的解决方案之一。该系统基于智能应用级C h e c kPointVPN-1VSXNG平台,用户无需部署多个解决方案,就可以实现端到端的安全,减少硬件成本和管理成本。诺基亚虚拟安全域系统允许用户在单一设备上运行超过250个虚拟防火墙实例,每个实例都拥有独立的策略、管理权限和日志等。诺基亚企业解决方案事业部亚太区副总裁TimLee表示:“设计和构建诺基亚虚拟安全域系统是为所有规模的公司提供网络安全保护功能,可以为用…     

虚拟网络技术在计算机网络信息安全中的应用价值研究

随着信息时代和数字化社会的发展,计算机网络信息技术在各个工作领域普及,在人们的生产生活中成为不可或缺的一部分,同时计算机网络的安全问题也面临了巨大的挑战.虚拟网络技术是解决计算机网络信息安全的关键内容,在安全问题上具有可靠性,在信息延展上具有方便性,并且使用成本低.本文通过对虚拟网络技术的简单介绍,概述其特点和优势,分析虚拟网络技术在计算机网络信息安全中应用的价值.     

VPN技术实现消防监控系统跨网互联

该体系架构以弱电消防网络为基础,利用VPN虚拟专用网络技术成功实现了对消防网络的远程集中管理和实时管理。系统尝试用vpn服务器而不使用专用网络和拨号猫的情况下,在网络上实现跨网消防监控与报警,使用VPN虚拟专网技术是跨网消防监控与报警性价比较高的一种解决方案。     

基于VPN技术的网络应用

互联网的快速发使得如何实现信息的安全传送和资源的充分利用成为急需解决的两大问题,虚拟专用网络技术则为这两大问题提供了很好的解决方案。介绍了虚拟专用网络的基本技术和实现原理,并分析了虚拟专用网络技术在解决网络发展实际问题中的具体应用和这项技术的发展前景。     

基于VPN网的企业办公安全接入技术

在互联网技术不断发展的推动下,人们在工作和生活中逐渐能够利用互联网来访问自己公司的内部网络,从而实现在家办公的愿望。通过广泛考察各种互联网接入方式,发现基于虚拟专网VPN和第三方安全认证技术能够为认证用户的安全接入提供支持,实现在外工作人员对企业内部OA系统、邮件系统和特定应用系统的访问,并展示了一种简洁、高效、安全的解决方案。     

KVM over IP技术在校园网中的应用与研究

KVM主机切换系统是通过模拟信号实现一个用户使用一套键盘、鼠标、显示器去访问和操作一台至数千台以上主机的功能,KVM overIP技术是近年来兴起的一种在因特网上通过多个虚拟端口安全连接服务器的KVM连接技术.分析了KVM over IP原理及其技术特点,针对校园网机房远程管理所面临的问题,结合同济大学校园网实例,提出了基于KVM over IP技术实现服务器远程监控管理的解决方案.     

WLAN的安全问题与解决方案

分析了WLAN安全方面存在的问题,综合使用802.1x、EAP和WPA技术提出一个WLAN安全体系结构解决方案,给出了具体工作过程。     

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.