简介：Thisarticlepresentsanovelimageinterpolationbasedonrationalfractalfunction.Therationalfunctionhasasimpleandexplicitexpression.Atthesametime,thefractalinterpolationsurfacecanbedefinedbyproperparameters.Inthispaper,weusedthemethodof‘coveringblanket’combinedwithmulti-scaleanalysis;thethresholdisselectedbasedonthemulti-scaleanalysis.Selectingdifferentparametersintherationalfunctionmodel,thetextureregionsandsmoothregionsareinterpolatedbyrationalfractalinterpolationandrationalinterpolationrespectively.Experimentalresultsonbenchmarktestimagesdemonstratethattheproposedmethodachievesverycompetitiveperformancecomparedwiththestate-of-the-artinterpolationalgorithms,especiallyinimagedetailsandtexturefeatures.

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简介：Wepresentthesolidmodeleditdistance(SMED),apowerfulandflexibleparadigmforexploitingshapesimilaritiesamongstCADmodels.ItisdesignedtomeasurethemagnitudeofdistortionsbetweentwoCADmodelsinboundaryrepresentation(B-rep).Wegivetheformaldefinitionbyanalogywithgrapheditdistance,oneofthemostpopulargraphmatchingmethods.Toavoidtheexpensivecomputationalcostpotentiallycausedbyexactcomputation,anapproximateprocedurebasedonthealignmentoflocalstructuresetsisprovidedinaddition.Inordertoverifytheflexibility,wemakeintensiveinvestigationsonthreetypicalapplicationsinmanufacturingindustry,anddescribehowourmethodcanbeadaptedtomeetthevariousrequirements.Furthermore,amultilevelmethodisproposedtomakefurtherimprovementsofthepresentedalgorithmonbotheffectivenessandefficiency,inwhichthemodelsarehierarchicallysegmentedintotheconfigurationsoffeatures.ExperimentresultsshowthatSMEDservesasareasonablemeasurementofshapesimilarityforCADmodels,andtheproposedapproachprovidesremarkableperformanceonareal-worldCADmodeldatabase.

简介：Inordertoreducenursingintensityandimprovefreedomoftheelderlyandthedisabled,amulti-functionnursingwheelchairwhichcanswitchchairtobedandrealizemanykindsofposturetransformationisdesigned.Thispaperintroducesthemechanicalstructuredesign(positionadjustmentmechanismandvariablewheelbasemechanism)andcontroldesignofposturetransformationunitofmultifunctionalnursingwheelchair.

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简介：Motioncontrolcanbeconsideredasthesynergisticcollaborationofmechanicalandelectricalengineering,computerscienceandinformationtechnologytoapplyacontrolledforcetoachieveusefulmotioninfluidorsoiledelectromechanicalsystems.Withthedevelopmentofcomputer,electronics,andautomaticcontroltheory,motioncontrolcomestoanewstage.Greatapplicationsarebasedonthecharacteristics,stemmingfromadvantagesofelectronicsandmoderncontroltechnologyachievements,havingaverygoodloadmatchingproperty.Currently,microprocessor-basedcontrollersareinvariablyusedinmostapplicationsofdriveelectronics.Theobjectofthisworkistodesignapositioncontrolmechanismsystem,whichcanbeusedintestsectionoflowspeedwindtunnel.Systemloadspecificationsandperformancerequirementsaregiven.Acomprehensivestudyofmathematicalmodelingofthemechanismcomponentsisgiven.Procedureforselectionofvariouscomponentswithoptimumparametersisdiscussed.Afterselectionandcalculationofsystemparameterstomeettheperformancerequirements,aPIDcontrolmethodisadopted.

简介：Inthepreprocessingphase,theglobalterrainmodelispartitionedintoblockswiththeirfeaturepointsbeingpickedouttogenerateTINmodelforeachterrainblock,thenthemulti-resolutionmodelsofterrainorganizedintheformofquad-treeiscreatedbottom-up.Cracksbetweenterrainblocksareavoidedbyinsertingverticestoformcommonboundaries.Atrun-time,aview-dependentLODalgorithmisusedtocontroltheloadingandunloadingoftheproperblocksbyanadditionalsynchronousthread.ToeliminatetheartifactscreatedbyLODtransitions,geomorphingisusedinreal-time.TheserenderingstrategiesincreasethethroughputofGPUandavoidimbalanceofloadamongCPU,GPUandDiskI/O.Experimentalresultsshowthatthesystemcanperformvisuallysmoothrenderingoflarge-scaleterrainsceneswithfinequalityatanaveragerateof80fps.

简介：Themechanicalstructureaswellastheschematicorganizationhasbeendesignedtoachievelowerlimbrehabilitationtrainingfunction;Solidworkshasbeenusedtomodeltherobot.Andtherobothasbeenoptimizedbythemeansofhuman-interferenceengineering.TheprimarycomponentsoftherobothavebeenanalyzedbyAnsysworkbench.

简介：Simulationandrenderingoflarge-scalenaturalenvironments,especiallytheocean,hasalwaysbeenoneofthehotissuesincomputergraphics,whichcanproviderealismforvariousapplicationssuchascomputergame,movieandmilitaryusage.Simulationofoceanenvironmentisoftenlackofrealismforreal-timeapplicationduetoitscomplexityofdynamicwaves.Inthispaper,amethodbasedonFFTWavemodelisproposedtosolvethisproblem,whichcanalsosimulatetheoceanopticpropertywithatmospherescattering.Furthermore,ourmethodhasalotofadvantagesincludingglobaloceandatasetsupport,real-time,dynamicreflectionofocean,thefoamonthewave,smoothtransitionfromdeepoceantoseacoast,etc.Theexperimentalresultsdemonstratetherealismandeffectivenessofourapproach.

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简介：Theefficientandreliablehumancentereddesignofproductsandprocessesisamajorgoalinmanufacturingindustriesfornumeroushumanfactorsmustbetakenintoaccountduringtheentirelifecycleofproducts.Amulti-agentsintelligentdesignsystemispresentedformanufacturingprocesssimulationandproducts’ergonomicanalysis.Invirtualdesignenvironment,thevirtualhumanwithhigh-levelintelligenceperformstasks’operationautonomouslyandshowsoptimumpostureconfigurationwithergonomicassessmentresultsinrealtime.Thefunctionsarerealizedbyintelligentagentsarchitecturebasedonamodernapproachderivedfromfuzzymulti-objectsdecision-makingtheory.Acasestudyispresentedtodemonstratethefeasibilityofthesuggestedmethodology.

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简介：Pathplanningin3Dgeometryspaceisusedtofindanoptimalpathintherestrictedenvironment,accordingtoacertainevaluationcriteria.Tosolvetheproblemoflongsearchingtimeandslowsolvingspeedin3Dpathplanning,amodifiedantcolonyoptimizationisproposedinthispaper.Firstly,thegridmethodforenvironmentmodelingisadopted.Heuristicinformationisconnectedwiththeplanningspace.Asemi-iterativeglobalpheromoneupdatemechanismisproposed.Secondly,theoptimalantsmutatethepathstoimprovethediversityofthealgorithmafteradefinediterativenumber.Thirdly,co-evolutionaryalgorithmisused.Finally,thesimulationresultshowstheeffectivenessoftheproposedalgorithminsolvingtheproblemof3Dpipepathplanning.

简介：Accordingtothestudyonseat-backcurvesaboutdifferentpeople,themethodthatusingtwoarc-shapedroofstogivebacksupportingforceofthehumanbodyisproposed.Throughacleverdesignapplicationofpiezoelectricsensor,microcontroller,motors,andarc-shapedroofsformaclosedloopcontrolsystem.Throughthedesignofhorizontalandverticaladjustmentmechanism,aflexibleandadaptivemulti-dimensionalbackcanreducetheharmtohumanspinewhichcausedbypoorpostureandsedentarylifestyle.ModelbuildingandstressanalysisaredonebyInventorsoftwaretoverifythemechanismofstrength.

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