简介：

简介：TheLHCexperimentsatCERNwillgeneratehugevolumesofdata-severalPBperyearatdataratesbetween100MB/sand1.5GB/s.Thestorageandanalysisofthesedatapresentamajorchallenge.IncollaborationwithothermembersoftheformerRD45project,thecentraldatabasesupportgroupatCERNhasbeenworkingonthisissueforseveralyears,leadingtoproductionuseofapotentialsolution,basedonthecombinationofanObjectDatabaseandMassStoragesystem,botheatCERNandoutside.

简介：Thefastturnoverofsoftwaretechnologies,inparticularinthedomainofinteractivity(coveringuserinterfaceandvisualisation)makesitdifficultforasmallgroupofpeopletoproducecompleteandpolishedsoftware-toolsbeforetheunderlyingtechnologiesmakethemobsolete.AttheHepVis'99workshop,aworkinggrouphasbeenformedtoimprovetherpoductionofsoftwaretoolsfordataanalysisinHENP.Besidepromotingadistributeddevelopmentorganisation,onegoalofthegroupistosystematicallydesignasetofabstractinterfacesbasedonusingmodernOOanalysisandOOdesigntechniques.Aninitialdomainanalysishascomeupwithseveralcategories(componets)foundintypicaldataanalysistools:historams,Ntuples,Functions,Vectors,Fitter,Plotter,AnalyzerandController,SpecialEmphasiswasputonreducingthecouplingsbetweenthecategoriestoaminimum,thusoptimisingre-useandmaintainabilityofanycomponentindividually.TheinterfaceshavebeendefinedinJavaandC++andimplementationsexistintheformoflibrariesandtoolsusingC++(Anaphe/Lizard,Openscientist)andJava(JavaAnalysisStudio),AspecialimplementationaimsataccessingtheJavaLiraries(throughtheirAbstractInterfaces)fromC++.ThispapergiveranoverviewofthearchitectureanddesignofthevariouscomponentsfordataanalysisasdiscussedinAIDA.

简介：Since1998,theALICEexperimentandtheCERN/ITdivisionhavejointlyexecutedseverallarge-scalehighthroughputdistributedcomputingexercises:theALICEdatachallenges.ThegoalsoftheseregularexercisesaretotesthardwareandsoftwarecomponentsofthedataacqusitionandcomputingsystemsinrealisticconditionsandtoexecuteanearlyintegrationoftheoverallALICEcomputinginfrastructure.ThispaperreportsonthethirdALICEDataChallenge(ADCIII)thathasbeenperformedatCERNfromJanuarytoMarch2001.ThedatausedduringtheADCⅢaresimulatedphysicsrawdataoftheALICETPC,producedwiththeALICEsimulationprogramAliRoot.ThedataacquisitionwasbasedontheALICEonlineframeworkcalledtheALICEDataAcquisitionTestEnvironment(DATE)system.Thedataaftereventbuilding,werethenformattedwiththeROOTI/OpackageandadatacataloguebasedonMySQlwasestablished.TheMassStorageSystemusedduringADCIIIisCASTOR.Differentsoftwaretoolshavebeenusedtomonitortheperformances,DATEhasdemonstratedperformancesofmorethan500MByte/s.Anaggregatedatathroughputof85MByte/swassutainedinCASTORoverseveraldays.Thetotalcollecteddataamountsto100TBytesin100.00files.

简介：Inthispaperwepresentanoverviewoftheongoingstudiestobuildupaframeworkthatsupportstheanalysisafterthereprocessingphase.ThisframeworkaimstodevelopastandarddataquerylanguagefortheHEPcommunity,Therelatedstudieshavebeenconsideringtherelationaldatabasemodelaspossibleapproachopposedtotheobjectmodel.SeveraloptimizingandtunningtechniquesarebeingusedintechnologieslikeDB2[3],Oracle[5]andRoot[2],thataresimultaneouslybeingevaluated.TheexperienceobtainedcanbeseenasavaluabletestbedforthefutureLHCandsimultaneouslyasinterestinginputforthedevelopmentoftheGRID.

简介：ThemaingoaloftheHyperCP(E87)experimentatFermilabistosearchforCPviolationinΞandΑdecaysatthe-10^-4level.Thislevelofprecisiondictatesadatasampleofoverabillionevents.Theexperimentcollectedabout231billionraweventsonabout30,0005-GBtapesintenmonthsofrunningin1997and1999,Inordertoanalyzethishugeamountofdata,thecollaborationhasreconstructedtheeventsonafarmof55dual-processorLinux-basedPCsatFermilab.AsetoffarmtoolshasbeenwrittenbythecollaborationtointerfacewiththeFarmBatchSystem(FBSandFBSNG)[1]developedbytheFermilabComputingDivision,toautomatemuchofthefarmingandtoallownonexpertfarmshifterstosubmitandmonitorjobsthroughaweb-basedinterface.Specialcarehasbeentakentoproducearobustsystemwhichfacilitateseasyrecoveryfromerrors.Thecodehasprovisionsforextensivemonitoringofthedataonaspill-by-spillbasis,asisrequiredbytheneedtominimizepotentialSystematicerrors.About36millionplotsofvariousparametersproducedfromthefarmanalysiscanbeaccessedthroughadatamanagementsystem.Theentiredatasetwasfarmedinelevenmouths,oraboutthesametimethatwastakentoacquirethedata.Wewilldescribethearchitectureofthefarm.ourexperienceinoperatingit,andshowsomeresultsfromthefarmanalysis.

简介：时空单极方程是在到ℝ2,1的ℝ2,2的anti-self-dualYang工厂方程的减小。这个方程是一个非线性的波浪方程，并且能被编码为宽松的对。相等的宽松的对被奶妈和Terng使用与连续散布数据构造单极，然后方程能被散布数据线性化，允许一个使用散布方法解决有很快腐烂的Cauchy问题的逆小起始的数据。在这篇论文，我们使用holomorphic捆的术语和某些地图的transversality，由起始的数据的parametrized，多达计量转变给更起始的数据，我们能与使用散布方法解决单极方程的Cauchy问题。

简介：InthispaperwehighlightstrategiesandchoicesthatmaketheDφDataHandlingsystemmarkedlydifferentfrommanyotherexperiments'systems,WeemphasizehowfartheDφsystemhascomeininnovatingandimplementingaDφ-specificDataGridsystem.Wediscussexperiencesduringthefirstmonthsofdetectorcommissioningandgivesomefutureplansforthesystem.

简介：Semiparametrictransformationmodelsprovideaclassofflexiblemodelsforregressionanalysisoffailuretimedata.Severalauthorshavediscussedthemunderdifferentsituationswhencovariatesaretimeindependent(Chenetal.,2002;Chengetal.,1995;Fineetal.,1998).Inthispaper,weconsiderfittingthesemodelstoright-censoreddatawhencovariatesaretime-dependentlongitudinalvariablesand,furthermore,maysuffermeasurementerrors.Forestimation,weinvestigatethemaximumlikelihoodapproach,andanEMalgorithmisdeveloped.Simulationresultsshowthattheproposedmethodisappropriateforpracticalapplication,andanillustrativeexampleisprovided.

简介：AsaresultofdiscussionswithintheHEPcommunity,wehavewrittenaC++packagewhichcanbeusedtomaintainatableofparticleproperties,includingdecaymodeinformation.Theclassesallowformultipletablesandacceptinpufromanumberofstandardsources,Inaddition,Theyprovideamechanismbywhichaneventgeneratorcanemploythetabulatedinformationtoactuallydirectthedecayofparticles.

简介：Iterativealgorithmsforsolvingthedataassimilationproblemsareconsidered，basedonthemainandadjointequations.Spectralpropertiesofthecontroloperatorsoftheproblemarestudied,theiterativealgorithmsarejustified.

简介：ＵｐｇｒａｄｅｏｆＧｏｏｓｙＤａｔａＡｃｑｕｉｓｉｔｉｏｎＳｙｓｔｅｍ￥ＷａｎｇＳｈｕｊｉｎ；ＷａｎｇＹａｎｙｕ；ＸｉｎｇＪｉａｎｐｉｎｇ；ＧｕｏＴｉａｎｒｕｉａｎｄＪｉａｏＤｕｎｐａｎｇＡｄａｔａａｃｑｕｉｓｉｔｉｏｎｓｙｓｔｅｍｎａｍｅｄＧｏｏｓ...

简介：在自然、社会的科学的许多实际系统能被动态网络描述。一天一天地，我们测量了并且从这些网络积累了数据的巨大的数量，它能被我们使用推进我们世界的理解。生产这些数据的网络的结构经常是未知的。因而，从可得到的数据理解这些网络的结构转弯是学科交差的域里的中央问题之一，它被称为网络重建问题。在这份报纸，我们用数据可获得性不为常规网络重建是足够的部分可得到的数据和一些状况考虑了网络重建的问题。而且，我们建议与仅仅可得到的子网和隐藏的全部网络的另外的节点的数据推断子网；与一些可得到的节点变量的一般水准在网络描绘组组相互作用；并且网络被未知内部快变化的噪音和未知外部慢慢地变化的信号驾驶仅仅，与节点变量的已知的数据执行网络重建。所有这些状况被期望在实际系统和方法普通，结果可能为真实世界应用是有用的。

简介：TheBaBardataacquisitionsystem(DAQ)transportsdatafromthedetectorfrontendeletronicstoshorttermdiskstorage.Amonitoringapplication(VMON)hasbeendevelopedtomonitortheonehundredandninetycomputersinthedataflowsystem.PerformanceinformationforeachCPUiscollectedandmulticastacrosstheexistingdatatransportnetwork.ThepacketsarecurrentlycollectedbyasingleUNIXworkstationandarchived.AROOTbasedGUIprovidescontrolanddisplaystheDAQperformanceinrealtime.ThesameGUIisreusedtorecoverarchivedVMONdata,VMONhasbeendeployedandconstantlymonitorstheBaBardataflowsystem.Ithasbeenusedfordiagnosticsandprovidesinputtomodelsprojectingfutureperformance.Theapplicationhasnomeasurableimpactondatataking,respondsinstantaneouslyonthehumantimescaletorequestsforinformationdisplay,andusesonly3%ofa300MHzSunUltra5CPU.

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

简介：

简介：

简介：WehavedevelopedadataobjectdescriptiontoolsuiteandserviceforAthenaconsistingof:alanguagegrammarbaseduponanextendedpropersubsetofIDL2.0,acompilerfrontendbaseduponthislanguagegrammar,JavaCC,andaJavaReflectionAPI-likeinterface,andseveralcompilerbackendswhichmeetspecificneedsinATLASsuchasautomaticgenerationofobjectconvertersanddataobjectscriptinginterfaces.WepresentheredetailsofourworkandexperiencetodateontheAthenaDefinitionLanguageandAthenaDataDictionary.

简介：TheD0experiment'sdataandjobmanagementsystemsoftware,SAM,isanoperationalprototypeofmanyoftheconceptsbeingdevelopedforGridcomputing.WeexplainhowthecomponentsofSAMmapintotheDataGridarchitecture,WediscussthefutureuseofGridcomponentstoeitherreplaceexistingcomponentsofSAMortoextenditsfunctionalityandutility.owrkbeingcarriedoutaspartoftheParticlePhysicsDataGrid(PPDG)project.

简介：Powerfulmainstreamcomputingequipmentandtheadventofaffordablemulti-Gigabitcommunicationtechnologyallowustotackledataacquisitionproblemswithclustersofinexpensivecomputers.Suchnetworkstypicallyincorporateheterogeneousplatforms,real-timepartitionsandcustomdevices.Therefore,onemuststriveforasoftwareinfrastructurethatefficientlycombinesthenodestoasingle,unifiedresourcefortheuser,Overallrequirementsforsuchmiddlewarearehighefficiencyandconfigurationflexibility.IntelligentI/O(I2O)isanindustryspecificationthatdefinesaunifrommessagingformatandexecutingmodelforprocessor-enabledcommunicationequipment.Mappingthisconcepttoadistribultedcomputingenvironmentandencapsulatingthedetailsofthespecificationintoanapplication-programmingframeworkallowustoproviderun-timesupportforclusteroperation.Thispapergivesabriefoverviewofaframework.XDAQthatwedesignedandimplementedatCERNfortheCompactMuonSolenoidexperiment'sprototypedataacquisitionsystem.