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简介：Large-scaleMIMO(multiple-inputmultiple-output)systemswithnumerouslow-powerantennascanprovidebetterperformanceintermsofspectrumefficiency,powersavingandlinkreliabilitythanconventionalMIMO.Forlarge-scaleMIMO,thereareseveraltechnicalissuesthatneedtobepracticallyaddressed(e.g.,pilotpatterndesignandlow-powertransmissiondesign)andtheoreticallyaddressed(e.g.,capacitybound,channelestimation,andpowerallocationstrategies).Inthispaper,weanalyzethesumrateupperboundoflarge-scaleMIMO,investigateitskeytechnologiesincludingchannelestimation,downlinkprecoding,anduplinkdetection.Wealsopresentsomeperspectivesconcerningnewchannelmodelingapproaches,advanceduserschedulingalgorithms,etc.

简介：Inordertoovercomethepoorlocalsearchabilityofgeneticalgorithm,resultinginthebasicgeneticalgorithmistime-consuming,andlowsearchabilityinthelateevolutionary,weusethegraycodinginsteadofbinarycodingatthebeginningofthecoding;weusemulti-pointcrossovertoreplacetheoriginalsingle-pointcrossoveroperation.Finally,theexperimentshowsthattheimprovedgeneticalgorithmnotonlyhasastrongsearchcapability,butalsothestabilityhasbeeneffectivelyimproved.

简介：Invideoinformationretrieval,keyframeextractionhasbeenrecognizedasoneoftheimportantresearchissues.Althoughmuchprogresshasbeenmade,theexistingapproachesareeithercomputationallyexpensiveorineffectiveincapturingsalientvisualcontent.Inthispaper,wefirstdiscusstheimportanceofkeyframeextractionandthenbrieflyreviewandevaluatetheexistingapproaches.Toovercometheshortcomingeoftheexistingapproaches,weintroduceanewalgorithmforkeyframeextractionbasedonunsupervisedclustring.Meanwhile,weprovideafeedbackchaintoadjustthegranularityoftheextractionresult.Theproposedalgorithmisbothcomputationallysimpleandabletocapturethevisualcontent.Theefficiencyandeffectivenessarevalidatedbylargeamountofreal-worldvideos.

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简介：Aimingattheproblemssuchasmorerepeatedlydesignandlongerdesigncycle,inthispaper,thesimilaritytheorywasintroducedtothedesignprocessofthekeystructuresofflotationmachine.TheimpellerandU-shapedtankofflotationmachinesystemwereanalyzedassimilarityunit.Meanwhile,thelevelofsimilarityoftheunitsandthesimilarityofthesystemwerecalculated.BasedontheanalysisoftheimpellerandthesizeofU-shapedtank,thesimilaritycriteriawerederived.Thederivedconclusionsare:(1)Therelationshipbetweenthediameteroftheimpellerandthevolumeofthetankwaspowerfunctionandcalculatedasthesimilaritycriteriaoftheimpeller;(2)TherelationshipbetweentheratiobetweentheU-shapedtank’scross-sectionalareaandimpeller’sdiameterandthevolumeofthetankwaspowerfunctionandcalculatedasthesimilaritycriterionsoftheU-shapedtank.Usingthesimilaritycriterioncombinedwithcomputertechnologyanddatabasetechnologytorealizepartandsystemserializationdesign.Theresultsshowthattheresearchcanavoidrepeatedlydesign,shortendesigncycle,andraisethedesignefficiency.

简介：Opticalmotioncaptureisanincreasinglypopularanimationtechnique.Inthelastfewyears,plentyofmethodshavebeenproposedforkey-frameextractionofmotioncapturedata,anditisacommonmethodtoextractkey-frameusingquaternion.Here,onemaindifficultyisduetothefactthatpreviousalgorithmsoftenneedtomanuallysetvariousparameters.Inaddition,itisproblematictopredefinetheappropriatethresholdwithoutknowingthedatacontent.Inthispaper,wepresentanoveladaptivethreshold-basedextractionmethod.Key-framecanbefoundaccordingtoquaterniondistance.Weproposeasimpleandefficientalgorithmtoextractkey-framefromamotionsequencebasedonadaptivethreshold.Itisconvenientwithnoneedtopredefineparameterstomeetcertaincompressionratio.Experimentalresultsofmanymotioncaptureswithdifferenttraitsdemonstrategoodperformanceoftheproposedalgorithm.Ourexperimentsshowthatonecantypicallycutdowntheprocessofextractionfromseveralminutestoacoupleofseconds.

简介：PF_KEY协议是IPSec的重要组成部分。密钥管理进程利用PF_KEY与内核的SADB进行通信，实现SA(SecurityAssociation,安全联盟)和SP(SecurityPolicy，安全策略)的管理。本文将从PF_KEY协议构造和PF_KEy相关系统调用等方面描述OpenBSD内核中的PF_KEY实现。

简介：随着多宗网络银行犯罪事件的发生，网上银行安全越来越被人重视，如何才能加强系统应用的安全性，提升人们对网上银行的信任度，成为网上银行业务中最亟待解决的问题，本文为读者带来指纹U-KEY，以供大家参考。

简介：近年来，一系列与网上银行安全相关的事件层出不穷，网络钓鱼，专业偷盗银行账号和密码的木马程序、黑客侵入，内部盗窍等都对网络银行的安全性提出了新的挑战，怎样才能加强系统应用的安全性，提升人们对网上银行的信任度，已经成为各家银行网上银行业务中最为亟待解决的课题。

简介：Identity-basedhashproofsystemisabasicandimportantprimitive.Ittographicschemesandprotocolsthataresecureagainstkey-leakageattacks.Inthisupdatableidentity-basedhashproofsystem,inwhichtherelatedmastersecretkeyiswidelyutilizedtoconstructcryp-paper,weintroducetheconceptofandtheidentitysecretkeycanbeupdatedsecurely.Then,weinstantiatethisprimitivebasedonlatticesinthestandardmodel.Moreover,weintroduceanapplicationofthisnewprimitivebygivingagenericconstructionofleakage-resilientpublic-keyencryptionschemeswithanonymity.Thisconstructioncanbeconsideredastheintegrationofthebounded-retrievalmodelandthecontinualleakagemodel.Comparedwiththeexistingleakage-resilientschemes,ourconstructionnotonlyismoreefficientbutalsocanresistmuchmorekeyleakage.

简介：这些年来,城商行系统开发建设处于高潮,这是由于我国经济的快速发展,城市商业银行规模迅速扩大,客户对商业银行服务的需求越来越多,对服务的质量要求也越来越高所导致的。与此同时,银监和人民银行对城商行的系统监管日益严格,各种监管系统建设也逐步展开,各种系统亟待开发,因而,这对系统开发与建设方面人员偏少的城商行是个极大的挑战。对此,笔者从城市商业银行现状出发,分析了软件系统项目开发管理各阶段存在的难点,提出了相应对策。

简介：高铁配备WiFi系统是提升服务质量与改善乘客体验的必然举措与有益探索。当前高铁WiFi系统技术应用的难点主要在两个方面:技术研究层面高铁时速极快导致WiFi的信号不稳定;商业运营层面高铁WiFi系统的商业运营变现模式制约。鉴于此,高铁应该构建融合多运营商的智能无线网络系统,实现无线网络的智能识别与自动切换;与此同时,需要采取高铁集团与技术企业联合运营模式,提升高铁WiFi系统商业化运营水平。

简介：　（二）、设置幻灯片母版　　幻灯片母版用来定义整个演示文稿的幻灯片页面格式,　　在你完成幻灯片母版的设置后,可以控制每一个应用此母版的标题幻灯片的格式和设置

简介：伴随着我国社会经济的不断发展和科学技术的进步，也相应的促进了我国计算机软件开发设计行业的发展，设计人员通过运用先进的设计方法，全面的提高了计算机软件开发设计的水平。因此，本文针对于计算机软件开发设计的难点和对策进行了具体的分析和研究，希望通过本文的探讨，能够进一步促进计算机软件开发设计工作的顺利进行。

简介：函数在C程序设计课程中占有非常重要的地位，但对于初学者来说，这部分内容很难理解。本文从函数这部分内容自身的特点及学生的学习状况出发，探讨了使用点面结合的方法，突破函数教学过程中的重难点。