无限局域网(WLAN)技术的优势浅析

无线局域网是计算机网络与无线通信技术相结合的产物。它采用无线通信技术代替传统电缆,提供传统有线局域网的功能。无线局域网的无线特性具有常规网络无可比拟的优势,在许多领域都有广泛的应用。     

质检行业无线网络技术应用

无线局域网是计算机网络与无线通信技术的结合的产物,并已迅速发展成为计算机网络中一个至关重要的组成部分,它的应用领域也在飞速扩大,为通信的移动化、个性化和多媒体应用提供了可能。人们的工作、生活越来越离不开计算机网络。通常计算机组网的传输媒介主要依赖钢缆或光缆构成有线局域网,但有线网络在某些场合要受到限制。无线局域网常采用射频工作方式传输和接收数据,在有线局域网的基础上通过无线集线器、无线接入节点(AP)、无线网桥和无线网卡等设备使无线通信来实现。无线局域网就是解脱无线网络难题而出现的。     

3G不是终结者

无线局域网 无线局域网(WLAN)是计算机网络与无线通信技术相结合的产物,不采用传统电缆线,也能提供传统有线局域网的所有功能,网络所需的基础设施不需要再埋在地下或隐藏在墙里也能够随着你的需要移动或变化。无线局域网技术能够提高工作效率,且具有极强的灵活性。价格低、抗干扰性强,网络保密     

校园无线局域网搭建分析

在网络飞速发展的大背景下,无线通信的网络应用也掀然而起,建设一个安全可靠、使用方便、适应社会信息化发展的校园网络,已迫在眉睫,校园数字化顺理成章.目前,校园内的有线网络的容量和覆盖面已无法满足日益增长的网络接入需求,寻求一种高效的网络解决方案成为必然,校园无线局域网此时正是满足了这种需求.介绍了学校里原有线局域网的现状,从校园的网络需求出发,分析利用无线接入点将无线局域网(WLAN)连入现有有线网络的构建方法.     

WLAN的市场发展

无线局域网是利用无线通信技术在一定的局部范围内建立的网络．是计算机网络与无线通信技术相结合的产物，它以无线多址信道作为传输媒介，提供了传统的有线局域网的功能，使用户能够真正实现随时、随地、随意的宽带网络接入。     

无线局域网喜中有忧

以稳定、灵活而且速度快为特性的无线连网技术已经成熟,无线局域网产品供应商的数目也大大增加,连网设备则变得体积更小且价格更便宜了。很多机构都已从无线局域网的应用中获益非浅,同时它的显著优点和某些弱点都已经为人所关注。无线局域网通过接入点(Access Point)设备连接普通的有线以太网和 IPC 卡,从而为笔记本电脑和手持电脑增加了无线通信能力。从目前看来,运行在2.4GHz 频段、采用802.11b 协议的无线局域网设备可以以11Mbps 的速率传输数据.这比随处可见的100Mbps 有线局域网慢多了,但这个速率对大多数应用程序而言也算足够快.而且在传统的网络很难建设或者根本就不可能建立起来的环境里就更为     

无线局域网技术的现状及发展方向探讨

近年来,随着我国社会发展程度的不断提高,计算机网络技术和无线通信技术也得到了飞速发展,无线局域网技术就是在计算机技术和无线通信技术发展下的产物,无线局域网是对有线联网模式的补充和扩充,其增加了通信的灵活性和可移动性,给人们使用网络上网带来了很大的便利。无线局域网技术是信息技术的重要组成部分,其健康稳定地发展对社会的进步有重要作用,因此研究无线局域网技术的现状和发展方向很有意义,本文对无线局域网技术的现状和发展趋势进行探讨,以期对无线局域网技术发展提供参考。     

一个安全的无线局域网设计与实现

近年来，无线局域网作为传统有线局域网络的有效补充。得到了迅速的发展。然而无限局域网目前存在的安全隐患让许多人对无限局域网心存怀疑。本文详细给出了怎样设计与实现一个安全的无线局域网的过程。     

无线局域网在校园网建设中的应用

无线网络的出现就是为了解决有线网络无法克服的困难。无线局域网(WLAN)使用的是红外线(IR)或射频(RF)等无线介质传输数据,RF因其作用距离长、带宽大及覆盖范围广而更加受到欢迎。本文主要讨论无线局域网在校园的应用。无线局域网1.无线局域网的概念无线局域网(WLAN,WirelessLocalAreaNetwork)是计算机网络与无线通信技术相结合的产物。从专业角度讲,无线局域网利用了无线多址信道的有效方法来支持计算机之间的通信,并为通信的移动化、个性化和多媒体应用提供了可能。通俗地说,无线局域网就是在不采用传统缆线的同时,提供以太网或者…     

WLAN业务应用探讨

WLAN(Wireless Local Area Network)是利用无线通信技术在一定的局部范围内建立的网络．是计算机网络与无线通信技术相结合的产物．它以无线多址信道作为传输媒介，提供传统有线局域网的功能，能够使用户真正实现随时随地的宽带网络接入。WLAN具有易安装、易扩展、易管     

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。