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Cloudcomputing1.IntroductionCloudcomputingisknownasthemostanticipatedtechnologicalrevolutionovertheentireworld,andthereasonwhycloudcomputinghasbroughtwidespreadattentionisthatitnotonlyrepresentanewtechnologyappeared,butalsoleadtotheentireindustrytochange.Therefore,therankingofnationalcompetitivenesswillchangeaccordingly.2.CloudcomputingdefinitionandapplicationTheconceptofcloudcomputingisputforwardbyGoogle,whichisabeautifulnetworkapplicationsmode.BasedonincreasinginInternet-relatedservicesanddeliverymodels,itprovidesdynamic,easytoexpandandvirtualizedresourcesusuallythroughtheInternet.ThisservicecanberelatedtoIT,softwareandInternet;otherservicescanbesupportedtoo.Itmeansthatcomputingpowercanbecirculationasacommodity.Asweexpect,moreandmoreenterpriseusethisnewtechnologyintothepracticalapplication,suchaswebmail,Gmailandapplestoreuseitforcomputingandstorage.Withthetechnologydevelopment,cloudcomputinghasgivenfullplaytoitroles,Industry,NewcomersandMediabuycomputertechnologytomakenetworkcheaper,faster,convenientandbettercontrol.Cloudcomputingisusedinthedistributedcomputersbycomputing,ratherthanthelocalcomputerorremoteserver,theoperationoftheenterprisedatacenterandtheInternetaremoresimilar.Thisprocessallowscompaniestobeabletoswitchresourcestotheurgentapplicationaccordingtocomputerandstoragesystemsdemandaccess.Thismeansthatthecomputingpowercanbenegotiable,likewaterandelectricity,accessconvenientandlow-cost.ThebiggestdifferenceisthatitistransmittedviatheInternet.3.AdvantageByprovidingalargeandsecuredatastoragecentersforcloudcomputing,usersdonothavetoworryabouttheirowndatawhichbelostforsomereasonordestroyedbycomputervirusinvasion,suchassomedatastoredintheharddiskdatawillbelostbythecomputerdamagedandvirusinvasion,sothatuserscannotaccessthedataandrecoverdata,anotherdisadvantagemayalsoappearwhenotherpeopleuseyourcomputerstealtheuser'scomputer,suchaspersonalconfidentialinformationandbusinessdataloss.“Gateofbluephotosisatypicalinsecureexample.IfuseruploadsthephotosthroughtheInterneintodatastoragecenter,itmayhavelesschancetoaccesspersonalconfidentialinformation.Andwithcloudcomputingdevelopment,fortheuser,theseservicesarefreeofcharge,forthefuture,advancedtechnologywillcertainlybecomeacashcowformerchants,andforthecountry,thecomputingpowerisalsoabletoreflectacountrytechnologicallevelandthelevelofoverallnationalstrength.Astheuserdatastoredinthecloudstoragecenter,canreducecustomerdemandforthehardwarelevel,coupledwithcloudcomputingextremelypowerfulcomputingcapability,itcanenableuserstocalldatamoreconvenientandquickifcanaddthehigh-speednetworks.UsersnolongerneedreplacethecomputercausedbyhavingnoenoughharddiskspaceandCPUcomputingpower.Otherwise,usersonlysurftheInternettoaccesscloudstoragecenterandtheneasilyaccessthedata.Aspowerfuldatastoragecenters,themostwonderfulfeaturesissharingdata.NomattercomputerdataoravarietyofcommunicationdevicessuchasmobilephonesandPDA.Whensomedamagedappearedinyourphone,lostorreplacedinordertochasethetrendofthetimesandphone,datacopyisatediousthing.However,inanotherway,youcansolvetheentireproblemthroughcloudstoragecenter.Cloudcomputingserviceswillcreatemoremillionsofjobs.OnMarch6,anewsshowthatshowthatMicrosoftstatementacommissionedresearchconductedbytheworld-renownedmarketanalystfirmIDC.Theresearchshowthatcloudcomputingwillcreatenearly14millionnewjobsworldwidein2015.AndalsopredictedthatitcanstimulateITinnovationandbroughtthenewrevenuewhichcanreachabout$1.1trillion,coupledwithcloudcomputingefficiencysubstantiallypromote,theorganizationwillincreasere-investmentandworkopportunity.IDCchiefresearchofficer,asseniorvicepresident,JohnF.Gantzsaid:Formostorganizations,thereisnodoubtthatcloudcomputingwillsignificantlyenhancethereturnoninvestmentandflexibility,reduceinvestmentcosts,andbringrevenuegrowthmultipliedaswell,weusuallybelievethatcloudcomputingwillreducejobsbymistake,theopposite,itcancreatealotofjobsaroundtheworld,nomatteremergingmarket,smallcitiesandsmallbusinesseswillincreaseemploymentopportunitiesandgetbenefitfromcloudcomputing.14.DisadvantageWithlargestoragecenter,cloudcomputingstronglyurgespowerfulhardwareconditionsandsafetymeasures,whichincludingalargestoragespaceandpowerfulcomputingcapabilities.Astoday'sscientificandtechnologicalrapiddevelop,userincreased,hardwarecapabilitiesbecomeoneofthenecessaryconditionfordevelopment,moreover,thecloudshouldbekepttoenhancetheircomputingpowerandstoragespace,andendless.Securitymeasuresalsoincludetwoaspects;firstly,itisnecessarytoensurethatuserdatanotdamaged,lost,andstolenbyothers,whichrequiresastrongITteamtofullrangeofmaintenanceandstrictaccessmanagementstrategies.Someinformationhasbeenconfirmed,theexistingcloudcomputingserviceproviderstillcannotguaranteenosimilarproblemoccurs.Forusers,thisisaveryseriousproblem.Anothersecurityissueisanaturalorunnaturaldisaster,alsocancausethestoragecenterdamaged,cancauseuserscannotaccess.CloudcomputingservicesareavailableviatheInternet,therefore,userusuallyhavehighdemandsfornetworkaccessspeed,althoughdomesticaccessspeedsimprovefast,butcom