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Research on Market Operating Mechanism Nowadays, the digital and networked information environment has brought great convenience to people’s lives. It is the extensive use of information technology and the rapid development of Internet that has accelerated the global informatization. Thus,… Continue Reading…

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WirelessLAN by Emulator System Ascomparedwithcommunicationonastationaryhost,thequalityofcommunicationonamobilehostcanbeeasilydegradedbecauseoffading,waveinterferenceandsoon.Therefore,quantitativeevaluationofthequalityofaWebserviceonamobilehostisrequired.Especiallyitshouldbedoneinuserviewpointconsideringthatauserfinallydecidesthequality.Notethatthequalityofservice(QoS)inuser’sviewpointisoftenreferredtoasqualityofexperience(QoE).Thus,thispaperalsoadoptstheseterms.ToevaluateQoEofaWebservice,itisnecessaryforactualuserstoutilizetheWebserviceoveranactualnetworkandevaluateitwithsomesubjectivemethods.Inordertodothis,anexperimentermustprepareactualexperimentaldevices,suchasanaccesspoint(AP),somestations(STAs),andsoon.Moreover,iftheexperimenterassumesaWebclienttobeamobilehost,theusers(experimentalsubjects)mustusetheWebservicewhilemovingformanytimes.Thisimposesaheavyburdenontheusersandmakeslowreproducibilityoftheexperiment.Insteadofpreparingactualexperimentalenvironments,wecanconsiderusinganetworksimulatortoevaluateQoSofaWebserviceonamobilehost.However,sincethenetworksimulationisclosedwithinacomputer,usershardlyperformsubjectiveevaluationforsimulatedresults.Therefore,evalua-tionwithnetworksimulatorisnotalwayssuitablefortheQoEassessment SEO Company Kumbakonam hispaperstudiesamethodofevaluatingQoEofWebservicesonamobilehostoverawirelessLANbyusingtheintegratedsimulator/emulatorsystem.Therestofthispaperareasfollows.SectionIIintroducestheintegratedsimulator/emulatorsystem.WeshowourexperimentanditsresultsinSectionsIIIandIV,respectively.Finally,SectionVconcludesourstudy.II.INTEGRATEDSIMULATOR/EMULATORSYSTEMThedevelopedintegratedsimulator/emulatorsystemcanconnectmorethanonerealnetworkwitheachother.Bythesystem,anactualsenderhostcantransmitIPpacketstoanactualreceiveroneviavariouswithamobilehostoverawirelessLANvirtual(simulated)networks.Thesystemisdevelopedonanetworksimulatorns-3[3]andconsistsofsimulatorunitandemulatorone.Theformercanbuildsadesignatedexperimentalenvironmentonthens-3andhandleeventsundertheenvironmentinrealtime.Thelattertransmitsandreceivespacketsbetweenactualinterfacesandsimulatorunit.Byusingthissystem,itispossibletomeasureQoEunderanexperimentalenvironment.III.EXPERIMENTSA.EnvironmentFigure1showsourexperimentalenvironment.AsubjectusestheWebservicesdesignatedbytheexperimenteronthe Webclient.TheWebserverisconnectedtotheWebclientviatheintegratedsimulator/emulatorsystem,whichperformssimulationaccordingtothescenariosdescribedinthenextsubsection.TablesI,IIandIIIshowthespecificationsoftheWebclient,theintegratedsimulator/emulatorsystemandtheWebserver,respectively. ThispaperadoptsashoppingserviceandaWikiserviceastargetWebservices.TheshoppingserviceisaWebservicewhichincludesalotofHTMLfilesandimages,andWikiserviceconsistsonlyHTMLfiles.Astasks,thesubjectssearchsomeproductsdesignedbytheexperimentsfortheshoppingservice,andfindanswersofagivenquestionfortheWikiservice.Wesettasksthatsubjectschooseitemsspecifiedinshoppingservice,andlookforanswersofgivenquestioninWikiservice.Thesubjectsaremenaround20yearsold,andthenumberofthem ExperimentalScenariosAsexamplesofevaluation,theexperimenttreatsthefol-lowingsixexperimentalscenarios,whicharereferredtoasfromEnv1toEnv6forconvenience’ssake.Theyhavetheirowncombinationsofthenumberofaccesspoints(APs),thatofterminalsandthetypeofpropagationlossmodelinthewirelessLAN.Hereweassumethatapedestriancarriesalimitforeachtask,wedealwithonlytheeffectivenessandthesatisfactionasQoEparameters.Wegetthesatisfactionfromthequestionnairetakentosubjects.Inthequestionnaire,weaskwhethertherehasbeennocompletedissatisfactionwiththeWebservice,andweevaluatedtheeffectivenessfromtheachievementofthetask.Inaddition,wealsomeasuretheTCPthroughputandtheelapsedtimetoobtainaWebfileasQoSparameters https://arudhrainnovations.com/