简介:Oneofthekeycomponentsofanygridarchitectureismanagingcomputeandstorageresourcesandoptimizingtheirutilization.SAMhasimplementedfeaturesthatallowittoexercisea"fairshare"and"prioritized"policyamongmanygroupsofusers.Thegoalsareasfollows:1)implementthexperimentspoliciesforresourceusagebyresearchgroupandbydataaccessmode,and2)optimizetheresourceusagetomaximizetheoverallthroughputdefinedintermsofrealdataprocessingactivity,AtthelowestlevelofSAMarchitecture,calledthestation,theSAMsystemintegratesthedatadeliveryandcachemanagementwiththejobcontrolandschedulingofthebatchsystem.Atthesite-level,forexampleatFermilab,requestsfordatafromon-sitestationsaremanagedtooptimizeMassStorageSystemresourcesandnetworkthroughput,Managementofresourcesatavariousgeographiclevelsarediscussed.
简介:Objective:ToevaluateandcomparethediagnosticvalueinatlantoaxialsubluxationbyCTthree-dimensional(3D)reconstruction.Methods:3Dreconstructionfimdingsof41patientswithatlantoaxiaisubluxationwereretrospectivelyanalyzed,andcomparisonsweremadeamongimagesoftransversesection,multiplanarreformorting(MPR),surfaceshadedisplay(SSD),maximumintensityproject(MIP),andvolumerendering(VR).Results:Of41patientswithatlantoaxialsubluxation,31belongedtorotarydislocation,5antedislocation,and5hinddislocation.Allthecasesshowedthedislocatedjointpanelofatlantoaxialarticulation.Fifteencasesshoweddeviationoftheodontoidprocessand8caseswideneddistancebetweenthedensandanteriorarchoftheatlas.ThedislocatedjointpanelofatlantoaxialarticulationwasmoreclearlyseenwithSSD-3Dimagingthananyothermethods.Conclusions:AtlantoaxialsubluxationcanwellbediagnosedbyCT3Dreconstruction,inwhichSSD-3Dimagingisoptimal.
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:为波浪领域推测的一个精确、宽角度的单程的增殖者面对大、快速的速度变化是为关于波浪方程prestack深度移植的研究的一个重要话题。基于在这篇论文介绍的最佳的可分离的近似,有前面、反的Fourier变换的混合的域算法被用来构造3D单程的波浪领域推测操作员。这个操作员在波浪号码和空间领域分开变量。当为侧面的速度变化的时间延期在空间领域被改正时,阶段移动操作在波浪数字领域被实现。单程的波浪操作符的推动回答证明数字计算与为每速度的理论值一致,表明与最佳的可分离的近似构造的操作符能被用于为小步的盒子的侧面的速度变化。SEG/EAGE模型和领域数据的成像结果显示新方法能习惯于图象建筑群结构。
简介:加拿大惠威集团现正向国内推出杜希D3.1型书架音箱及杜希D3.2型落地音箱。D系列所采用的低音单元D6具有强大的线性声压输出能力,其高密度铸铝盆架结构、一体化振膜,合理对称的磁路系统等优秀设计在世界同行中受到广泛的好评,北美音响界拥有很高声誉的TOTEM(图腾)公司在其99年最新推出的顶级型号FOREST中,低音单元采用惠威D6.8(国内型号D6),惠威D6.8单元出色的低频表现使FOREST受到世界各地音响媒介非常高的评价。D系列的高音单元X1为惠威公司顶级产品,它的声音表现无论从动态、速度、反映、音色都是一流的,X1的设计是由惠威美国加州开发中心负责,按国际著名的丹麦B&K系统标准
简介:Inrecentyears,thevolumetricapproachof3Dreconstructionhasemergedasapowerfulclinicmethodforbiomedicalapplications.Thisapproachisbasedonavoxelrepresentedobjectwhichmaintainsmanydetailsofthesurfaceandtheinternalcon-structuresoftheoriginalbody.Becauseofahugeamountofdata,thevolumedatasettakesalargesizeofmemory,andahighprocessingspeedisrequiredinorderto
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简介:从目前国际形势看,在国际经济格局中,任何一个欧盟成员国都无法单独同日本、美国抗衡。因此实行单一货币的最大动力就是欧洲各国结成一个整体同日本、美国相抗衡,加强欧洲对世界的影响。所以欧盟单一货币的实现具有划时代的意义。欧洲统一的货币——欧元将成为世界上最重要的货币之一。1.对国际经济和国际全融市场的影响冷战结束后,世界经济力量对比已从以美国为中心的一极体制过渡到美国、欧盟、日本之间基本保持平衡的三极体制。布雷顿森林体系垮台以后,国际货币体系中,也发生了类似的变化。欧元诞生后将成为国际货币体系中最有竞争力的货币。据估计,全球将有5000亿至10,000亿美元的资产将以欧元金融工具的形式存放。欧元的出