虚拟局域网的划分和配置

该文叙述了VLAN技术的优点及划分方式,并以iSpirit3026、iSpirit4508交换机为例给出了VLAN的配置实例,更好地解决网络冲突和广播风暴等问题．网络性能和安全性也得到了提高。     

双核心确保网络安全

联想天工网络根据兴业制衣公司的需求定制了网络方案。企业本地交换网设计总部的本地交换网在组建方式上采用了二层网络结构:核心、接入。核心层设备选用联想网络的企业级核心交换机联想天工iSpirit4808和iSpirit4504,利用冗余组网方式以及组播和QOS特性,承担企业网的核心应用。在汇聚层选用联想天工iSpirit2908GF,在接入层选用联想天工iSpirit2924G。在总部的网络平台上,两台联想天工iSpirit4800系列交换机(4808/4804),利用千兆链路聚合技术组建双核心的网络,同时采用目前比较流行的冗余网关技术E S R P/V R R P为汇聚层设备提供冗…     

让IPv4与IPv6互联互通——联想万兆城域网解决方案

针对用户对城域网建设的需求,联想网络在万兆城域网解决方案中,采用了联想天工iSpirit6800全系列交换机。在组网技术上,它利用了联想天工iSpirit6800系列交换机多项城域网技术,以确保用户的城域网高性能、高可靠、高智能地运行。 不仅如此,联想网络基于联想     

基于VLAN技术在高校校园网建设中的应用

随着校园网规模的不断扩大,网络信息需求的不断增加,VLAN技术被运用到校园网的建设中。VLAN是在物理网络的基础上通过技术手段按照管理功能建立的逻辑网络;VLAN技术的应用有效避免了广播风暴;增强了局域网的安全性。本文描述了VLAN的基本概念和原理,VLAN的种类划分及其特点,并结合实际分析了VLAN技术在校园网建设中的应用。     

采用VLAN增加企业内部网安全性

本文介绍了VLAN技术,并通过VLAN在企业中的应用实例,探讨了采用VLAN增强企业内部网络的安全性的方法和VLAN配置过程.     

给万兆升级留空间——联想天工网络为吉林大学提供过渡方案

吉林大学珠海软件学院正在进行第一期的网络工程,目标是建立一个先进、可靠以及实用性较高的千兆校园网,也就是有线上网遍布校园、无线上网方便用户、电子公务畅通南北、远程教学覆盖全球。建设中,联想为其打造的网络解决方案不仅为该校计算机网络系统提供了可靠、稳定的保证,更为向下一代网络演进提供了过渡方案。考虑到性价比与技术的可扩展性,吉林大学珠海软件学院在产品设备选型中,采用了联想天工iSpirit6808、联想天工iSpirit系列可堆叠网管千兆交换机,此外还采用联想网管软件EPIcenter、联想认证和计费软件Hyper-boss。整个网络采…     

采用VLAN增加企业内部网安全性

本文介绍了VLAN技术,并通过VLAN在企业中的应用实例,探讨了采用VLAN增强企业内部网络的安全性的方法和VLAN配置过程。     

中科院成都分院建宽带社区

6月25日获悉,联想天工网络产品中标中科院成都分院宽带社区网项目。成都分院有近3500个信息点的接入需求,主要设备为联想 iSpirit29系列千兆网管交换机和 iSpirit15V 系列智能型交换机。     

基于MAC地址的动态VLAN原理及组网应用

给出了VLAN的定义和分类,分析了静态VLAN和动态VLAN的优缺点并对动态VLAN进行了分类.重点介绍了基于MAC地址的动态VLAN的工作原理和配置过程,最后结合实际介绍其在校园网络中的应用.     

动态VLAN和Guest VLAN技术在校园网中的应用

介绍了VLAN技术及其在校园网用户认证中的应用.VLAN技术为解决网络配置和管理提供了良好的方法,随着网络的不断发展,VLAN技术将得到更加广泛的应用.     

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.