共查询到20条相似文献,搜索用时 828 毫秒
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随着无线网络技术的发展,人们对无线局域网络的接入点技术提出了更高的要求。论文提出了一种对接入点设备进行虚拟化的设计方法,即把一个接入点虚拟成多个接入点,每个虚拟接入点具备原接入点的所有功能。这样仅通过一个接入点设备可以组建多个不同的无线局域网,并且每个网络拥有自己的安全策略。在不改变原来硬件的情况下成功完成了软件的设计,并把它应用于实际的接入点设备之中。 相似文献
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主要从青海省防汛抗旱信息网络工程建设的目标,主要任务、设计思想、拓拟结构,系统的组成,网络设备技术规范进行了概述;对系统安全、虚拟网络(VLAN)、交换、路由、网络管理等技术从实现方法上进行了分析;对主干交换机、路由器、集线器、服务器、防火墙等网络关键设备进行了严格的选型;对系统决策应用平台的设计提出了新的思路。 相似文献
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以中线工程河北段主干线为例,讲述了虚拟技术在南水北调工程中的应用设计,并利用虚拟三维模型在三维景观显示、最佳路线选择、缓冲分析、土方计算、分析表面形态、计算坡度、坡向、长度等方面进行了可行性分析。并指出今后需进一步解决的问题。 相似文献
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虚拟演播室是计算机技术在电视节目制作领域的最新应用之一,它的出现,是演播室视频技术乃至电视节目后期制作的一场革命.对虚拟演播室的系统构成及工作原理进行了探讨,分析了虚拟演播室的系统特点,并提出了一套虚拟演播室实施方案. 相似文献
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3维虚拟地球技术发展与应用 总被引:1,自引:0,他引:1
随着遥感技术、计算机技术和网络技术的发展,在应用需求牵引下,以GoogleEarth为代表的3维虚拟地球得到迅速发展和应用.对此,主要讨论了几个主要3维虚拟地球系统及特点.结合地理信息服务技术的发展趋势,介绍了自主研制的开放式虚拟地球集成共享平台GeoGlobe及其应用特点,阐述了虚拟地球技术与应用的发展趋势. 相似文献
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陈延文 《成都信息工程学院学报》2002,17(3):184-187
综述了怎样充分利用Cisco公司Cisco 2509访问路由器的广域网接口,实现局域网与两个ISP网络的互连,从而在不增加任何设备的前提下,实现提高局域网到因特网出口带宽,并给出了路由器的详细设置。 相似文献
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基于无线局域网IEEE802.11技术的地理空间定位方法 总被引:1,自引:0,他引:1
分析对比了多种地理空间定位方法,归纳了各种不同尺度下定位的特点,以及定位方法的实现过程,从IEEE802.11无线局域网技术的MAC协议出发,提出了基于无线局域网IEEE802.11技术的地理空间定位方法,实现的技术流程,并分析了其发展趋势。利用MAC的帧头和帧体都可以实现定位功能,利用MAC帧头的定位可以适用于计算能力较强的移动台上,而利用帧体的定位,由于只需解析内容不需要查询计算,所以能够用于手机等移动对象。使用无线局域网可以实现定位平台,同时又能实现无线接入的通信功能,所以大大降低了总的建设成本,因此具有很大的现实意义。 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献
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《山地科学学报》2014,(4):I0004-I0009
<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet. 相似文献
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《山地科学学报》2014,(4)
<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by 相似文献
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References: 《极地研究(英文版)》2007,18(1):73-83
Using the NCEP/NCAR reanalysis monthly 500 hPa height data on a 2.5 latitude-longitude grid and 1°×1° sea ice data,the polar vortex area,intensity index and arctic sea ice area index are calculated respectively,and the meridional distribution,period variation and the abrupts in the long range trend are analyzed to study their relationship.The results show that the meridional distribution of sea ice and polar vortex h-ave distinctive difference,the relative positions of them are different in the eastern and western hemispheres,and exept they have periods of 4 months,quasi half year,quasi year,4-5 years and 10 years commonly,and each of them has its own respective variation as well.The sea ice area is decreasing apparently since 1980's,so is the polar vortex area,but their abrupt changge time are different totally.The area of sea ice and polar vortex has prominent positive correlation,but the relationship of sea ice intensity,polar vortex intensity,polar vortex area is complicated. 相似文献
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《中国海洋大学学报(英文版)》2014,(3):I0001-I0001
<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research 相似文献