简介:Thisstudypresentsaclearevolutionofcomputinganditskeyapplications.Cloudcomputingservicesevolvedfromdistributed,grid,andutilitycomputing.CriticalcompaniessuchasSalesforce,Amazon,Google,andMicrosoftplayimportantrolesincloudcomputing.Dramaticchangesinthetechnologyenvironmenthavecreatednewchallengesforcurrentinformationtechnologies.Thisstudydiscussesfoursignificantchallengesforcloudcomputingservices,includingthenext-generationInternet,datasynchronization,cloudsecurity,andcompetitiveadvantages.Andthenitalsodiscusseshowmanagerscanlearnaboutthefutureofcloudcomputingservices.
简介:ToimproveuserexperienceofcompositeWebservices,auser-awarequalityofservice(QoS)basedWebservicescompositionmodelisproposed.Undersuchmodel,aWebservicesselectionmethodbasedonquantumgeneticalgorithmisproposed.Thisalgorithmusesquantumbitencoding,dynamicstep-lengthquantumgateangleadjustment,neighborhoodservicesearchanddynamicpunishmentstrategytoexpandsearchscopeandspeedupconvergence.SimulationexperimentshowsthatthisalgorithmismoreefficientthanotherexistingalgorithmsinWebservicesselection.