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简介：分发评价是很重要的以便基于这分布为参数或它的函数做统计推理。例如，在这个工作，我们与非光滑的辅助信息建议某变量的分发的一个评估者这个变量的对称的分布。一种变光滑的技术被采用处理非可辨的功能。因此，分布能基于弄平的辅助信息被估计。分发评估者的Asymptotic性质被导出并且分析。没有这些辅助信息，分发评估者基于我们的方法被发现比相应评估者显著地有效。一些模拟研究被进行说明建议评估者的有限样品表演。

简介：ThispaperextendstheSPHmethodtogassimulation.TheSPH(SmoothedParticlesHydrodynamics)methodisthemostpopularmethodofflowsimulation,whichiswidelyusedinlarge-scaleliquidsimulation.However,itisnotfoundtoapplytogassimulation,sincethosemethodsbasedonSPHcan’tbeusedinreal-timesimulationduetotheirenormousparticlesandhugecomputation.ThispaperproposesamethodforgassimulationbasedonSPHwithasmallnumberofparticles.Firstly,themethodcomputesthepositionanddensityofeachparticleineachpoint-in-time,andoutlinestheshapeofthesimulatedgasbasedonthoseparticles.Secondlythemethodusesthegridtechniquetorefinetheshapewiththediffusionofparticle’sdensityunderthecontrolofgrid,andgetmorelifelikesimulationresult.Eachgridwillbeassigneddensityaccordingtotheparticlesinit.Thedensitydeterminesthefinalappearanceofthegrid.Forensuringthenaturaltransitionofthecolorbetweenadjacentgrids,wegiveadiffuseprocessofdensitybetweenthesegridsandassignappropriatevaluestovertexesofthesegrids.Theexperimentalresultsshowthattheproposedmethodcangivebettergassimulationandmeettherequestofreal-time.

简介：Particlebasedmethodscanbeusedforboththesimulationsofsolidandfluidphasesinmultiphasemedium,suchasthediscrete-elementmethodforsolidphaseandthesmoothedparticlehydrodynamicsforfluidphase.Thispaperpresentsacomputationalmethodcombiningthesetwomethodsforsolid-liquidmedium.ThetwophasesarecoupledbyusinganimprovedmodelfromareportedLagrangian-Eulerianmethod.Thetechniqueisverifiedbysimulatingliquid-solidflowsinatwo-dimensionallid-drivencavity.

简介：Thepredictionaccuracyofasimulationmethodislimitedbyitstheoreticalbackground.Thisfactcanleadtodisadvantagesregardingthesimulationqualitywheninvestigatingsystemsofhighcomplexity,e.g.containingcomponentsshowingafairlydifferentbehavior.Toovercomethislimitation,co-simulationapproachesareusedmoreandmore,combiningtheadvantagesofdifferentsimulationdisciplines.Thatiswhyweproposeanewstrategyforthedynamicsimulationofcuttingprocesses.ThemethodcouplesLagrangianparticlemethods,suchasthesmoothedparticlehydrodynamics(SPH)method,andmultibodysystem(MBS)toolsusingco-simulations.Wedemonstratethecapabilityofthenewapproachbyprovidingsimulationresultsofanorthogonalcuttingprocessandcomparingthemwithexperimentaldata.

简介：Inthisstudy,theNorthChinaseismicregionwasselectedasthestudyarea,andevaluationofseismichazardusingthespatialsmoothingseismicitymodelwasperformed.Firstly,thestudyareaisdividedintogrids,andsomeparameters(e.g.b-value,M0,Mu,azimuthandM-Lrelationship)foreachseismotectonicmodelwereassigned.Secondly,usingellipticalsmoothingbasedonaseismotectonicbackgroundmodel,thestatisticalearthquakeincidencerateineachgridissuccessivelycalculated.Lastly,therelevantgroundmotionattenuationrelationshipischosentoassessseismichazardofgeneralsites.Themapsforthedistributionofhorizontalpeakgroundaccelerationwith10%probabilityofexceedancein50yearswereobtainedbyusingtheseismichazardanalysismethodbasedongridsource.Thisseismicitymodelsimplifiesthemethodologyofprobabilisticseismichazardanalysis,especiallyappropriateforthoseplaceswhereseismictectonicsisnotyetclearlyknown.Thismethodcanprovidevaluablereferencesforseismiczonationandseismicsafetyassessmentforsignificantengineeringprojects.

简介：Thenumericalmodellingoftheinteractionsbetweenwaterwavesandfloatingstructuresissignificantfordifferentareasofthemarinesector,especiallyseakeepingandpredictionofwave-inducedloads.SeakeepinganalysisinvolvingsevereflowfluctuationsisstillquitechallengingevenfortheconventionalRANSmethod.Particlemethodhasbeenviewedasalternativeforsuchanalysisespeciallythoseinvolvingdeformableboundary,wavebreakingandfluidfragmentationaroundhullshapes.Inthispaper,theweaklycompressiblesmoothedparticlehydrodynamics(WCSPH),afullyLagrangianparticlemethod,isappliedtosimulatethesymmetricradiationproblemforastationarybargetreatedasaflexiblebody.Thisiscarriedoutbyimposingprescribedforcedsimpleharmonicoscillationsinheave,pitchandthetwo-andthree-nodedistortionmodes.Theresultant,radiationforcepredictions,namelyaddedmassandfluiddampingcoefficients,arecomparedwithresultsfrom3-Dpotentialflowboundaryelementmethodand3-DRANSCFDpredictions,inordertoverifytheadoptedmodellingtechniquesforWCSPH.WCSPHwerefoundtobeinagreementwithmostresultsandcouldpredictthefluidactionsequallywellinmostcases.

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简介：肝胞虫疾病是在农场和牧剧区域的普通寄生疾病，它严重影响人的健康。基于这疾病的CT成像特征，为肝分割的一条反复的途径和胞虫损害抽取同时被建议。在每次重复，我们的算法由二主要的步组成：1)根据在肝和胞虫的自定义象素种子，损害，Gaussian概率模型试穿和弄平的贝叶斯的分类被使用得到肝和损害的起始的分割；2)用priori形状力量地的参量的活跃轮廓模特儿被收养精制起始的分割。我们由不同病人的CT片的肝和胞虫损害分割的实验在建议算法有效性上做主观、客观的评估。与地面真相手册分割结果比较，试验性的结果显示我们的方法的有效性分割肝和胞虫损害。