简介：

简介：ＴｗｏＡｌｇｏｒｉｔｈｍｓｆｏｒＦａｓｔＰｏｌｙｈｅｄｒｏｎＲａｙ－ＴｒａｃｉｎｇＺｈａｎｇＱｉａｎＳｈｉＪｉａｏｙｉｎｇＣａｉＨｏｎｇＣＡＤ＆ＣＧＳｔａｔｅＫｅｙＬａｂ．，ＺｈｅｊｉａｎｇＵｎｉｖｅｒｓｉｔｙ，３１００２７ＦｏｓｈａｎＥｎｔｅｒｐｒ...

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简介：Stereomatchingisafundamentalandcrucialproblemincomputervision.Inthelastdecades,manyresearchershavebeenworkingonitandmadegreatprogress.Generallystereoalgorithmscanbeclassifiedintolocalmethodsandglobalmethods.Inthispaper,thechallengesofstereomatchingarefirstintroduced,andthenwefocusonlocalapproacheswhichhavesimplerstructuresandhigherefficiencythanglobalones.Localalgorithmsgenerallyperformfoursteps:costcomputation,costaggregation,disparitycomputationanddisparityrefinement.Everystepisdeeplyinvestigated,andmostworkfocusesoncostaggregation.Westudiedmostoftheclassicallocalmethodsanddividethemintoseveralclasses.Theclassificationwellillustratesthedevelopmenthistoryoflocalstereocorrespondenceandshowstheessenceoflocalmatchingalongwithitsimportantanddifficultpoints.Attheendwegivethefuturedevelopmenttrendoflocalmethods.

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简介：Thispaperpresentsanewbasis,theWSBbasis,whichunifiestheBernsteinbasis,Wang-BallbasisandSaid-Ballbasis,andthereforetheBéziercurve,Wang-BallcurveandSaid-BallcurvearethespecialcasesoftheWSBcurvebasedontheWSBbasis.Inaddition,therelativedegreeelevationformula,recursivealgorithmandconversionformulabetweentheWSBbasisandtheBernsteinbasisaregiven.

简介：Inthispaper,thesmoothconnectionbetweentwoB-splinesurfacesisdiscussed.First,abriefproofofsomesimplesufficientconditionsofG~0andG~1continuityisgiven.Onthisbasis,anovelmethodforG~0orG~1connectionbetweentwoadjacentB-splinesurfacesispresented.Areparameterizationstepisfirstlytakenforoneofthesurfacessuchthattheyhavethesameparameterizationinvdirection,then,adjusttheirboundarycontrolverticestomakethemG~0orG~1connected.TheG~1connectionparameterisdeterminedbyanoptimizationproblem.Comparedwiththeexistedmethods,ourmethodissimpleandeasytobeusedinpractice.

简介：Airentrappedinliquidmetalduringthemoldfillingprocessseriouslyaffectsthecastingquality,thusitisimportanttotrackitsbehaviorinthemoldcavity.Aliquid-gastwo-phaseflowmodelisdevelopedtodescribethemoldfillingprocessandpredicttheairentrapmentdefect.ThemodelisbasedonthecombinationofSOLAandLevelSetMethod.ThepressureandvelocityfieldsarecalculatedbySOLA,andtheinterfacemovementissimulatedbyLevelSetmethodasthemostcommoninterfacetrackingmethodinrecentyears.Inordertovalidatethefeasibilityofthemodel,theliquid-gastwo-phasesimulationresultsweretestedbythebrokendamproblemandtheS-shapedexperiment.ComparisonbetweentheexperimentsandsimulationresultsshowthatLevelSetmethodmightbeaverypromisingtoolintwo-phaseflowsimulationduringthemoldfillingprocess.

简介：在无数魔戒迷的翘首苦待下，“魔戒Ⅱ-双塔奇兵”终于重磅出击，在北美首映就超过了第一集，创全球历次电影首映的最高票房成绩，且仍有乘胜长驱之势。是什么让这部影片受到如此的关注?是创下逾9亿美元的全球票房收入，荣登电影票房史的第五位，还是被“TheSun”评选为改变电影史的十部巨作之一?到底有何超凡魅力，让我们来一探究竟。

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简介：最初接触3dsmax时，都是对照着书籍进行这样那样的练习，完成各种各样的动画作品，在很长一段时间内都感到非常有趣。然而，突然之间，你会发现很多问题在困扰着你，例如：如何制作人类的头发或者动物的皮毛?又该如何表现它们的运动呢?

简介：Akindofdrivecircuitwhichislowpowerconsumption,high-performanceandhigh-poweroutputforsteppingmotor,basedonBY-5064,andakindofdedicatedcircuitfortwo-phasehybridsteppingmotoraredesigned,drivecontrolforsteppingmotorwithhigh-powerisachieved.