简介:Ahandveinauthenticationsysteminwhichtheidentityofanindividualcanbereadilyconfirmedupongrippingahandleisproposed.Thisrecognitionmethodincorporatesinfraredlight-emittingdiode(LED)ontoadoorhandleandsetsacharge-coupleddevice(CCD)cameraontheothersideofthehand.Itbuildsonfuzzyc-meansclusteringandparallelneuralnetworks(NNs);moreover,itisexpectedtosolvethepatternrecognitionprobleminlarge-scaledatabasesusingNNsduetoitsself-learningandparallelprocessingcapabilitiesandbyeffectivelyincorporatingtrainingpatterns.Theexperimentalresultsvalidatetheefficiencyoftheproposedalgorithm.
简介:Duringtheformationofsub-wavelengthripples,theinitialsurfaceplasmon(SP)-laserinterferenceplaysanimportantrole.InthisLetter,theeffectsofgratingstructuresonthedistributionoftheabsorbedlaserintensity,SP-lasercoupling,freeelectrondistributions,andablationshapesareinvestigatedbytheplasmamodel,takingintoconsiderationboththelaserwave-particledualityandthetransientlocalizedchangesofmaterialproperties.ThesimulationresultsshowthatthegratingstructurescanstronglyenhancetheenergyabsorptionandSP-lasercoupling,whichmakesthefabricationofsub-wavelengthripplesmoreefficient.Itisalsofoundthattheablationshapes,intermsofablationdepthsandsub-wavelengthripplesperiods,arestronglyrelatedtothegratingstructures,whichcanbeusedtocontrolmicro/nanostructurespreciselyanduniformly.