简介：TheCDFexperimentstarteddatatakinginApril2001,Thedataareorganizedintodatasetswhichcontaineventsofsimilarphysicspropertiesandreconstructionversion.theinformationaboutdatasetsisstoredintheDataFileCatalog,arelationaldatabase.Thisinformationispresentedtothedataprocessingframeworkasobjectswhichareretrievedusingcompoundkeys.Theobjectsandthekeysaredesignedtobethealgorithms'viewofinformationstoredinthedatabase.ObjectsmayuseseveralDBtables.Adatabaseinterfacemanagementlayerexistsforthepurposeofmanagingthemappingofpersistentdatatotransientobjectsthatcanbeusedbytheframework.Thislayerexistsbetweenthealgorithmcodeandthecodewhichreadsdirectlyfromdatanbasetables.Attheuserend,itplacesget/putinterfaceonatopofatransientclassforretrievalorstorageofobjectsofthisclassusingakey.DataFileCatalogcodemakesuseofthisfacilityandcontainsallthecodeneededtomanipulateCDFDataFileCatalogfromaC++programorfromthecommandprompt,ItsupportsanOracleinterfaceusingOTL,andamSQLinterface,ThiscodeandtheOravcleimplementationofDataFileCatalogweresubjectedtotestduringCDFCommissioningRunlastfallandduringfirstweeksofRunIIinApril.Itperformedexceptionallywell.

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简介：Thisstudytestedfivemethodswidelyusedinestimatingthecompletemagnitudes(MC)ofearthquakecatalogs.Usingcatalogsofobservedearthquakeproperties,wetesttheperformanceofthesefivealgorithmsunderseveralchallengingconditions,suchassmallvolumeofeventsandspatial-temporalheterogeneity,inordertoseewhetherthealgorithmsarestableandinagreementwithknowndata.Wefindthatthemaximumcurvaturemethod(MAXC)hasperfectstability,butwillsignificantlyunderestimateMCunlessheterogeneityisabsent.MCestimatedbytheb-valuestabilitymethod(MBS)requiresmanyeventstoreachastableresult.Resultsfromthegoodnessoffitmethod(GFT)wereunstablewhenheterogeneityloweredthefitnesslevel.Theentiremagnituderangemethod(EMR)isrelativelystableinmostconditions,andcanreflectthechangeinMCwhenheterogeneityexists,butwhentheincompletepartoftheearthquakecatalogisdismissed,thismethodfails.Themedian-basedanalysisofthesegmentslopemethod(MBASS)cantoleratesmallsamplesize,butisincapableofreflectingthemissingdegreeofsmalleventsinaftershocksequences.InconditionswhereMCchangesrapidly,suchasinaftershocksequences,observingthetimesequencedirectlycangiveapreciseestimationofthecompletesub-catalog,butonlywhenthenumberofeventsavailableforstudyislargeenoughcantheMAXC,GFT,andMBSmethodsgiveasimilarlyreliableestimation.

简介：Animprovedrandomizedalgorithmoftheequivalent2-catalogsegmentationproblemispresented.Theresultobtainedinthispapermakessomeprogresstoanswertheopenproblembyanalyzethisalgorithmwithperformanceguarantee.A0.6378-approximationfortheequivalent2-catalogsegmentationproblemisobtained.

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