简介:AtpresentE-commercesystemtendstobecomemorecomplex,andtraditionalsystemdesigningmethodscannotfufiltheneedofE-commercesystem,thusrequiringaneffectivemethodassolution.Withthisconcern,thispaperintroducessomeconceptsofcomponenttechnology,thenbringsforwardthenewconnotationandbasicfeaturesofcomponenttechnologythroughtheanalysisofitstechnologicalcharacter.ThispaperfinallydiscussestheapplicationofcomponenttechnologytoE-commercesystem.
简介:Anewfairoff-lineelectroniccashschemeonellipticcurvecryptographywaspresented.Thenewschemeismoreefficientthanthosebyextendingfairoff-lineelectroniccashschemefromfinitefieldintoellipticcurvecryptographyandintroducinganewellipticcurvediscretelogarithmassumption.Theexpirydateanddenominationareembeddedintotheblindlysignedcoinbyintegratingpartiallyblindsignaturewithrestrictiveblindsignature.Abankneednotusedifferentpublickeysfordifferentcoinvalues,shopsandusersneednotcarryalistofbank'spublickeystoverifyintheirelectronicwallet.Atthesametime,thebankjustneedstokeepundueelectroniccoinsfordoublespendingcheckinhisdatabase,thusbank'sdatabasecanbedramaticallyreduced.
简介:Withtherapiddevelopmentofglobalinformationhighway,multimediacommunicationtechnologyplaysamoreandmoreimportantroleinnationaleconomicandsocialdevelopment.However,themultimediacommunicationsystemisacomplicatedrealtimedistributedsystemanditssoftwareisdifficulttodevelop.Inordertoimprovetherapiddevelopmentandapplicationofthemultimediacommunicationtechnology,thereisanurgentneedtocarryoutthebasicresearchworkofsoftwaredevelopmentplatforminthisfield.
简介:Title:DiscontinuousDeformationAnalysisandRecentCrustalMovementAuthor:WANGZeminSupervisor:LIUJingnanThestudyfocusesonthewait_to_be_resolvedimportantdifficultproblem—howtoanalyzeandprocessthenumerousdataofcrustalmovementgainedbyrecentmeasuringmethodsoastodiscovertheinnermechanisms,thispaper,adopt
简介:Airborne3DimagewhichintegratesGPS,attitudemeasurementunit(AMU),scanninglaserrangefinder(SLR)andspectralscannerhasbeendevelopedsuccessfully.ThespectralscannerandSLRusethesameopticalsystemwhichensureslaserpointtomatchpixelseamlessly.Thedistinctiveadvantageof3Dimageisthatitcanproducegeo_referencedimagesandDSM(digitalsurfacemodels)imageswithoutanygroundcontrolpoints(GCPs).ItisnolongernecessarytosurveyGCPsandwithsomesoftwaresthedatacanbeprocessedandproducedigitalsurfacemodels(DSM)andgeo_referencedimagesinquasi_real_time,therefore,theefficiencyof3Dimageis10~100timeshigherthanthatoftraditionalapproaches.Theprocessingprocedureinvolvesdecomposingandcheckingtherawdata,processingGPSdata,calculatingthepositionsoflasersamplepoints,producinggeo_referencedimage,producingDSMandmosaicingstrips. Theprincipleof3Dimageisfirstintroducedinthispaper,andthenwefocusonthefastprocessingtechniqueandalgorithm.Theflighttestsandprocessedresultsshowthattheprocessingtechniqueisfeasibleandcanmeettherequirementofquasi_real_timeapplications.
简介:Severaldifferentstrategiesof3Dmodelingareadoptedfordifferentkindsofmanmadeobjects.Firstly,forthosemanmadeobjectswithregularstructure,if2Dinformationisavailableandelevationinformationcanbeobtainedconveniently,then3Dmodelingofthemcanbeexecuteddirectly.Secondly,forthosemanmadeobjectswithcomplicatedstructurecomparativelyandrelatedstereoimagespaircanbeacquired,inthelightoftopology-based3Dmodelwefinish3Dmodelingofthembyintegratingautomaticandsemi-automaticobjectextraction.Thirdly,forthemostcomplicatedobjectswhosegeometricalinformationcannotbegotfromstereoimagespaircompletely,weturntotopological3DmodelbasedonCAD.