简介：Westudytarget-searchingprocessesonapercolation,onwhichahuntertracksatargetbysmellingodorsitemits.Theodorintensityissupposedtobeinverselyproportionaltothedistanceitpropagates.TheMonteCarlosimulationisperformedona2-dimensionalbond-percolationabovethethreshold.Havingnoideaofthelocationofthetarget,thehunterdeterminesitsmovesonlybyrandomattemptsineachdirection.Forlagerpercolationconnectivityp(＞～)0.90,itrevealsascalinglawforthesearchingtimeversusthedistancetothepositionofthetarget.Thescalingexponentisdependentonthesensitivityofthehunter.Forsmallerp,thescalinglawisbrokenandtheprobabilityoffindingoutthetargetsignificantlyreduces.Thehunterseemstrappedintheclusterofthepercolationandcanhardlyreachthegoal.

简介：ＡｉｒｂｏｒｎｅＴａｒｇｅｔＳｔａｔｅＥｓｔｉｍａｔｏｒ￥ＨａｏＪｉａｎｋａｎｇ；ＺｈａｎｇＭｉｎｇｌｉａｎ＆ＷｅｎＣｈｕａｎｙｕａｎ（Ｆａｃｕｌｔｙ３０５ｏｆＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＡｅｒｏｎａｕｔｉｃｓ＆ＡｓｔｒｏｎａｕｔｉｃｓＢｅ...

简介：Itiswidelyacceptedthatthedesignofmorphologicalfilters,whichareoptimalinsomesense,isadifficulttask.Inthispaperanovelmethodforoptimallearningofmorphologicalfilteringparameters(Genetictrainingalgorithmformorphologicalfilters,GTAMF)ispresented.GTAMFadoptsnewcrossoverandmutationoperatorscalledthecurvedcylindercrossoverandmaster-slavemutationtoachieveoptimalfilteringparametersinaglobalsearching.Experimentalresultsshowthatthismethodispractical,easytoextend,andmarkedlyimprovestheperformancesofmorphologicalfilters.Theoperationofamorphologicalfiltercanbedividedintotwobasicproblemsincludingmorphologicaloperationandstructuringelement(SE)selection.Therulesformorphologicaloperationsarepredefinedsothatthefilter'spropertiesdependmerelyontheselectionofSE.Bymeansofadaptiveoptimizationtraining,structuringelementspossesstheshapeandstructuralcharacteristicsofimagetargets,andgivespecificinformationtoSE.Morphologicalfiltersformedinthiswaybecomecertainlyintelligentandcanprovidegoodfilteringresultsandrobustadaptabilitytoimagetargetswithclutterbackground.

简介：

简介：Theeffectsofdilatationalphasetransformationonthetargetstrengthofceramicmateri-alsareinvestigatedbasedonTate’smodel.Theconstitutivebehaviorofmaterialsindifferentregions(elastic,cracked,plasticandphasetransformation)aretakenintoaccount.Itisfoundthat,withaproperchoiceofmaterialparameters,thedilatationalphasetransformationcanincreaseeffectivelythetargetstrengthR_t.Thiswouldbeofimportanceinpenetration-resistancedesign.

简介：Inradartargettrackingapplication,theobservationnoiseisusuallynon-Gaussian,whichisalsoreferredasglintnoise.Theperformancesofconventionaltrackersdegradeseverelyinthepresenceofglintnoise.Animprovedparticlefilter,MarkovchainMonteCarloparticlefilter(MCMC-PF),isappliedtocopewithradartargettrackingwhenthemeasurementsareperturbedbyglintnoise.Trackingperformanceofthefilterisdemonstratedinthepresentofglintnoisebycomputersimulation.

简介：Manydevelopedcountrieshaveeverexperiencedtheperiodofheavyindustry;however,manyofthemhavecontrolledwelltheirenergyconsumptionsandkepttheenergyelasticityfactorsaroundT.What'sthereason?Intheauthors'opinion,ifdoeshavebusinesswiththeirdevelopmentideologies.

简介：

简介：地震数据获得几何学设计的常规方法基于水平表面下的反射镜的假设，它经常不对复杂结构合适。我们从控制照明分析开始并且为面向目标的成像提出地震调查几何学设计的一个方法。方法需要初步的地震解释获得的一个速度模型。单程的Fourier有限差别的波浪增殖者被用来外推到表面的目标层上的飞机波浪来源。由分析波浪精力，在表面的分发从需要的目标层，射击或接收装置地点外推因为目标层成像能是坚定的。用SEG-EAGE盐模型的数字测试建议这个方法为为面向目标的成像证实特殊地震获得几何学布局是有用的。关键词地震获得几何学-控制照明-面向目标的成像第一作者刘守伟是Ph。D。在Tongji大学的学生。毕业并且在2002从石油的中国大学在应用地球物理收到了一个学士学位。从那时起，他在Tongji学习了大学主修稳固的地球物理。他兴趣包括地震照明，成像和移植速度分析。

简介：ThepaperpresentsanalgorithmofautomatictargetdetectioninSyntheticApertureRadar(SAR)imagesbasedonMaximumAPosteriori(MAP).Thealgorithmisdividedintothreesteps.First,itemploysGaussianmixturedistributiontoapproximateandestimatemulti-modalhistogramofSARimage.Then,basedontheprincipleofMAP,whenaprioriprobabilityisbothunknownandlearnedrespectively,thesamplepixelsareclassifiedintodifferentclassesc={target,shadow,background}.Last,itcomparestheresultsoftwodifferenttargetdetections.Simulationresultspreferablyindicatethatthepresentedalgorithmisfastandrobust,withthelearnedaprioriprobability,anapproachtotargetdetectionisreliableandpromising.

简介：

简介：Anewtechniqueispresentedtodetecttargetsunderseabackground.Focusedoninterestedareas,thespatialandfrequencydistributionsarefirststudied,thenanalyticexpressionoftargetsissetupbyleastsquaremethod(LSM).Accordingtotheshape,frequency,andanalyticexpressionoftargets,amatchedbiorthogonalwaveletisconstructedtobetterenhancetargetsandeliminatenoises.Resultsshowtheusefulnessofthismethodforsingleframedetection(signaltonoiseratioSNR≥1.25),whichprovidesabetterperformancethanclassicwaveletsandmorphologicalfiltering.

简介：TARGET模式是一个有关课堂动机激发的教学模式。它从六个层面阐述了课堂结构对学生目标定向的作用，提出了有利于掌握目标定向的课堂结构和相应的教学策略。本文着重介绍了TARGT模式的理论依据和主要观点，探讨了TARGET模式与传统教学模式的差异及其在教育实践中的意义。

简介：

简介：Theclosephotogrammetric3-Dcoordinatemeasurementisanewmeasuringtechnologyinthefieldsofthecoordinatemeasurementmachine(CMM)inrecentyears.Inthismethod,weusuallyplacesometargetsonthemeasuredobjectandtakeimageoftargetstodeterminetheobjectcoordinate.Thesubpixellocationoftargetimageplaysanimportantroleinhighaccuracy3-Dcoordinatemeasuringprocedure.Inthispaper,somesubpixellocationmethodsarereviewedandsomefactorswhichaffectlocationprecisionareanalyzed.Thenweproposebilinearinterpolationcentroidalgorithm.Theexperimentshaveshownthisalgorithmcanimproveaccuracyoftargetcentroidbyincreasingavailablepixels.

简介：介绍了S函数的基础理论和利用S函数对Simulink中所没有的模块进行设计的方法,并采用此方法对RDC模块进行了具体的设计,通过仿真实验,验证了该方法的正确性.

简介：在水下目标识别是在声学的面对的一种关键技术并且在水下防卫。在这篇文章，一个识别系统基于模糊逻辑推理(可播放的动画文件)被建立。这个系统主要由三部分组成：模糊输入模块，有一套推理规则的模糊逻辑推理模块和de模糊的产量模块。Theinference结果证明识别系统处于大多数条件是有效的。

简介：Ananalysisispresentedfortargettrackingwithshortrangemultistaticradarsysteminthispaper.Thevelocityvectorisintroducedintothemodeltodepicttargetmotionmoreprecisely.Thesystemmeasurementequationissuchconstructedonthebasisofrangedifferencethatmakethetrackingmodelindependentofthetransmitterposition.Thereforethealgorithmisverymuchsuitableforthecasethatthetransmitterisnotfixed.Simulationresultsshowthatthealgorithmhastheadvantagesoffasttrackingandsmallsteadytrackingerrors,andcanbeusedfortrackingtargetinshortrangewithmultistaticradarsystem.

简介：TheExperimentalAdvanced.SuperconductingTokamak(EAST)isbeingbuiltinChinatoachievehighpowerandlongpulseoperationforstudiesofreactor-relevantissuesundersteady-stateconditions.AmajorconcernforEASTisthepowerhandlingcapabilityofthedivertortargetplates,whichisacriticalissueforfuturehigh-poweredsteady-statetokamaks,suchasITER.DetailedmodelingusingB2/EIRENEcodepackageandthemostrecentchemicalsputteringdatashowsthatthepresenceofstrongchemicalsputteringatthemainchamberwallleadstostrongcarbonradiationintheperipheryoftheconfinedplasma,significantlyreducingtheheatfluxestothetargetplatesandfacilitatingplasmadetachmentatalowerdensitydesiredforlowerhybridcurrentdriveinEAST,withonlyaslightincreaseinZ_(eff)attheedge.Thetargetheatloadcanbefurtherreducedbyoperatingwithadouble-nulldivertorconfiguration,whichalsoleadstoasignificantreductionintheedgeZ_(eff).However,thecodepredictsthatthedouble-nulloperationwouldresultinastrongdivertorasymmetryintargetpowerloading,favoringtheoutsidetargets.

简介：