简介：Oneoftheopenissuesinprincipleschemedesignofmechanicalsystemsisprinciplerepresentation,whichnotonlyoutliesthephysicalprinciples,butalsofacilitatesthedesignsynthesis.Anenergy-basedapproachtorepresentprincipleschemedesignisproposed.Firstly,anenergyinteractionmodelofmechanicalsystemsisestablishedandanintermediatemodelisderived,inwhichprincipleschemedesignistransformedintosolvingtheenergyfunctionsofsystem.Thentheenergyfunctionsaremodeledwiththelanguageofbondgraphs,andprinciplerepresentationforcomponenytsispresented.Finally,characteristicsofthedevelopedrepresentationapproachareanalyzedandadesignexampleofgatedrivesystemisgiventodemonstratethisapproach.

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简介：Vehielesenlistedwitheomputing,sensingandcommunicatingdevicescancreatevehicularnetworks,asubsetofcooperativesystemsinheterogeneousenvironments,aimingatimprovingsafetyandentertainmentintraffic.Invehicularnetworks,avehicle’sidentityisassociatedtoitsowner’sidentityasauniquelinkage.Therefore,itisofimportancetoprotectprivacyofvehiclesfrombeingpossiblytracked.Obviously,theprivacyprotectionmustbescalablebecauseofthehighmobilityandlargepopulationofvehicles.Inthiswork,wetakeanon-trivialsteptowardsprotectingprivacyofvehicles.Asprivacydrawspublicconcerns,wefirstlypresentprivacyimplicationsofoperationalchallengesfromthepublicpolicyperspective.Additionally,weenvisionvehicularnetworksasgeographicallypartitionedsubnetworks(cells).Eachsubnetworkmaintainsalistofpseudonyms.Eachpseudonymincludesthecell’sgeographicidandarandomnumberashostid.Beforestartingcommunication,vehiclesneedtorequestapseudonymondemandfrompseudonymserver.Inordertoimproveutilizationofpseudonyms,weaddressastochasticmodelwithtime-varyingarrivalanddeparturerates.Ourmaincontributionincludes:1)proposingascalableandeffectivealgorithmtoprotectprivacy;2)providinganalyticalresultsofprobability,varianceandexpectednumberofrequestsonpseudonymservers.Theempiricalresultsconfirmtheaccuracyofouranalyticalpredictions.

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简介：Ageneralizednon-stationarycurvesubdivision(GNSforshort)schemeofarbitraryorderk≥3withaparameterhasbeenproposedbyFangetal.inthepaper(FangMei-eetal.,CAGD,2010(27):720-733).IthasbeenprovedthattheproposedschemeoforderkgeneratesCk-2continuouscurvesfork≥4.Buttheproofofthesmoothnessinthispaperisuncompleted.Moreover,theC1-continuityofthethirdorderschemehasnotbeendiscussed.Forthisreason,inthispaper,weprovideafullcorrectedproofofthesmoothnessoftheGNSschemeoforderkfork≥3.

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简介：Thedevelopmentofnewproductsofhighquality,lowunitcost,andshortleadtimetomarketarethekeyelementsrequiredforanyenterprisetoobtainacompetitiveadvantage.Thispartofthepaperpresentsamethodologytoautomaticallysimulatetheconceptualdesignresultsinthevirtualentityform.Totheidentifiedbasicmechanisms,theirkinematicanalysisiscarriedoutbymatchingbasicBarranovtrusses,andtheirvirtualentitiesaremodeledbasedonfeature-basedtechniqueandencapsulatedasonedesignobject.Basedonthestructuresofthebasicmechanismsandtheirconnections,aspacelayouttothemechanicalsystemcorrespondingtothesymbolicschemeisthenfulfilled.Withthepreset-assemblyapproach,allpartsinthemechanicalsystemareputontoproperpositionswheretheconstraintequationsaremetaccordingtothespacelayoutresults.Inthisway,thevirtualentityassemblymodelofthemechanicalsystemrelativetothesymbolicschemeissetup.Theapproachpresentedinthispapercannotonlyobtaininnovativeconceptualconceptualdesignresults,butalsocanevaluatetheirperformancesunder3-Denviromentefficently.

简介：Thedevelopmentofnewproductsofhighquality,lowunitcost,andshortleadtimetomarketarethekeyelementsrequiredforanyenterprisetoobtainacompetitiveadvantage.Forshortingtheleadtimetomarketandimprovingthecreativityandperformancesoftheproduct,arule-basedconceptualdesignapproachandamethodologytosimulatetheconceptualdesignresultsgeneratedinconceptualdesignprocessinautomaticalvirtualentityformarepresentedinthispaper.Thispartofpaperpresentsarule-basedconceptualdesignmethodforgeneratingcreativeconceptualdesignschemesofmechanismsbasedonYan’skinematicchainregenerationcreativedesignmethod.Thedesignrulesareadoptedtodescribethedesignrequirementsofthefunctionalcharacteristics,theconnectionrelationshipsandtopologicalcharacteristicsamongmechanisms.Throughthegraphs-basedreasoningprocess,theconceptualdesignspaceisexpandedextremely,andthepotentialcreativeconceptualdesignresultsarethendugout.Byrefiningthedesignrules,thesolutionexplorationproblemisavioded,andthetendentiousconceptualdesignschemesaregenerated.Sincemechanical,electricalandhydraulicsubsystemscanbetransformedintogeneralmechansims,theconceptualdesignmethodpresentedinthispapercanalsobeappliedintheconceptualdesignproblemofcomplexmechatronicsystems.Andthenthemethodtoidentifyconceptualdesignschemesisgiven.