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简介：Thisarticleisaboutapieceofmiddleware,allowingtoconvertadumptapebasedTertiaryStorageSystemintoamultipetabyterandomaccessdevicewiththousandsofchannels.Usingtypicalcachingmechanisms,thesoftwareoptimizestheaccesstotheunderlyingStorageSystemandmakesbetteruseofpossiblyexpensivedrivesandrobotsorallowstointegratecheapandslowdeviceswithoutintroducingunacceptableperformancedegadation.Inaddition,usingthestandardNFS2protocol,thedCacheprovidesauniqueviewintothestoragerepository,hidingthephysicallocationofthefiledata,cachedortapeonly.BulkdatatransferissupportedthroughthekerberizedFTPprotocolandaC-API,providingtheposixfileaccesssemantics,Datasetstaginganddiskspacemanagementisperformedinvisiblytothedataclients.TheprojectisaDESY,FermilabjointefforttoovercomelimitationsintheusageoftertiarystorageresourcescommontomanyHEPlabs.ThedistributedcachenodesmayrangefromhighperformanceSGImachinestocommodityCERNLinux-IDElikefileservermodels.Differentcachenodesareassumedtohavedifferentaffinitiestoparticularstoragegroupsorfilesets.AffinitiesmaybedefinedmanuallyorarecalculatedbythedCachebasedontopologyconsiderations.Cachenodesmayhavedifferentdiskspacemanagementpoliciestomatchthelargevarietyofapplicationsfromrawdatatouseranalysisdatapools.

简介：Mostoftheearlierworkonclusteringmainlyfocusedonnumericdatawhoseinherentgeometricpropertiescanbeexploitedtonaturallydefinedistancefunctionsbetweendatapoints.However,dataminingapplicationsfrequentlyinvolvemanydatasetsthatalsoconsistsofmixednumericandcategoricalattributes.Inthispaperwepresentaclusteringalgorithmwhichisbasedonthek-meansalgorithm.Thealgorithmclustersobjectswithnumericandcategoricalattributesinawaysimilartok-means.Theobjectsimilaritymeasureisderivedfrombothnumericandcategoricalattributes.Whenappliedtonumericdata,thealgorithmisidenticaltothek-means.Themainresultofthispaperistoprovideamethodtoupdatethe'clustercenters'ofclusteringobjectsdescribedbymixednumericandcategoricalattributesintheclusteringprocesstominimisetheclusteringcostfunction.Theclusteringperformanceofthealgorithmisdemonstratedwiththetwowellknowndatasets,namelycreditapprovalandabalonedatabases.

简介：Networktrafficclassificationaimsatidentifyingtheapplicationtypesofnetworkpackets.ItisimportantforInternetserviceproviders(ISPs)tomanagebandwidthresourcesandensurethequalityofservicefordifferentnetworkapplications.However,mostclassificationtechniquesusingmachinelearningonlyfocusonhighflowaccuracyandignorebyteaccuracy.TheclassifierwouldobtainlowclassificationperformanceforelephantflowsastheimbalancebetweenelephantflowsandmiceflowsonInternet.Theelephantflows,however,consumemuchmorebandwidththanmiceflows.Whentheclassifierisdeployedfortrafficpolicing,thenetworkmanagementsystemcannotpenalizeelephantflowsandavoidnetworkcongestioneffectively.Thisarticleexploresthefactorsrelatedtolowbyteaccuracy,andsecondly,itpresentsanewtrafficclassificationmethodtoimprovebyteaccuracyattheaidofdatacleaning.Experimentsarecarriedoutonthreegroupsofreal-worldtrafficdatasets,andthemethodiscomparedwithexistingworkontheperformanceofimprovingbyteaccuracy.Experimentshowsthatbyteaccuracyincreasedbyabout22.31%onaverage.Themethodoutperformstheexistingoneinmostcases.

简介：在无损失的压缩的地里，当他们面对集体数据时，传统的软件的大多数类型有一些缺乏。他们的压缩能力被数据窗口尺寸和压缩格式设计限制。这份报纸论述格式说出支持数据窗户尺寸直到4GB并且在集体数据压缩有一些优点的CZ格式的压缩的一个新图案。用这种格式，一个压缩共享软件说出ComZip被设计。实验结果支持那ComZip在大多数情况中比WinZip，Bzip2和WinRAR有更好的压缩比率，特别当集体数据的GB或TB被压缩时。并且ComZip有潜力当数据窗户尺寸超过128MB，在未来打败7压缩。

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简介：Itisknownthatconditionalindependenceisaquitebasicassumptioninmanyfieldsofstatistics.Howtotestitsvalidityisofgreatimportanceandhasbeenextensivelystudiedbytheliterature.Nevertheless,alloftheexistingmethodsfocusonthecasethatdataarefullyobserved,butnoneofthemseemshavingtakenintoaccountofthescenariowhenmissingdataarepresent.Motivatedbythis,thispaperdevelopstwotestingstatisticstohandlesuchasituationrelyingontheideaofinverseprobabilityweightedandaugmentedinverseprobabilityweightedtechniques.Theasymptoticdistributionsoftheproposedstatisticsarealsoderivedunderthenullhypothesis.Thesimulationstudiesindicatethatbothtestingstatisticsperformwellintermsofsizeandpower.

简介：TheALICEdetectoratLHC(CERN),willrecordrawdataatarateof1.2Gigabytespersecond.TryingtoanalyseallthisdataatCRNwillnotbefeasible.AsoriginallyproposedbytheMONARCproject,dtacollectedatCERNwillbetransferredtoremotecentrestousetheircomputinginfrastructure,Theremotecentreswillreconstructandanalysetheevents.andmakeavailabletheresults.Thereforehigh-ratedatatransferbetweencomputingcentres(Tiers)willbecomeofparamountimportance.ThispaperwillpresentseveralteststhathavebeenmadebetweenCERNandremotecentresinPadova(Italy),Torino(Italy),Catania(Italy),Lyon(France),Ohio(UnitedStates),Warsaw(Poland)andCalcutta(India),Thesetestsconsisted,inafirststage,ofsendingrawdatafromCERNtotheremotecentresandback,usingaftpmethodthatallowsconnectionsofseveralstreamsatthesametime.Thankstothesemultiplestreams,itispossilbletoincreasetherateatwhichthedataistransferred.Whileseveral"multiplestreamftpsolutions"alreadyexist,ourmethodisbasedonaparallelsocketimplementationwhichallows,besidesfiles,alsoobjects(oranylargemessage)tobesendinparallel.Aprototypewillbepresentedabletomanagedifferenttransfers.Thisisthefirststepofasystemtobeimplementedthatwillbeabletotakecareoftheconnectionswiththeremotecentrestoexchangedataandmonitorthestatusofthetransfer.

简介：Distribution,interoperability,interactivity,componentarefourmainfeaturesofdistributedGIS.Basedontheprincipleofhypermap,hypermediaanddistributeddatabase,thepapercomesupwithakindofdistributedspatialdatamodelwhichisinaccordancewiththosefeaturesofdistributedGIS.Themodeltakescatalogserviceastheoutlineofspatialinformationglobalization,anddefinesdatastructureofhypermapnodeindifferentlevel.Basedonthemodel,itisfeasibletomanageandprocessdistributedspatialinformation,andintegratemulti_source,heterogeneousspatialdataintoaframework.Traditionally,toretrieveandaccessspatialdataviaInternetisonlybythemeormapname.Withtheconceptofthemodel,itispossibletoretrieve,load,andlinkspatialdatabyvector_basedgraphicsontheInternet.

简介：Timelyandcost-efficientmulti-hopdatadeliveryamongvehiclesisessentialforvehicularad-hocnetworks(VANETs),andvariousroutingprotocolsareenvisionedforinfrastructure-lessvehicle-to-vehicle(V2V)communications.Generally,whenapacket(oraduplicate)isdeliveredoutoftheroutingpath,itwillbedropped.However,weobservethatthesepackets(orduplicates)mayalsobedeliveredmuchfasterthanthepacketsdeliveredalongtheoriginalroutingpath.Inthispaper,weproposeanoveltreebasedroutingscheme(TBRS)forultilizingthedroppedpacketsinVANETs.InTBRS,thepacketisdeliveredalongaroutingtreewiththedestinationasitsroot.Andwhenthepacketisdeliveredoutitsroutingtree,itwon'tbedroptimmediatelyandwillbedeliveredforawhileifitcanarriveatanotherbranchofthetree.WeconducttheextensivesimulationstoevaluatetheperformanceofTBRSbasedontheroadmapofarealcitycollectedfromGoogleEarth.ThesimulationresultsshowthatTBRScanoutperformtheexistingprotocols,especiallywhenthenetworkresourcesarelimited.

简介：ATLAS[1]hasrecentlyjoinedGaudi,anopenprojecttodevelopadataprocessingframeworkforHEPexperiments[2],ThedatamodelisoneoftheareaswhereATLAShasextendedmoretheoriginalGaudidesigntomeettheexperiment'sownrequirments.ThispaperdescribesStoreGate,thefirstimplementationoftheATLASDataModel.

简介：高压缩比率，高译码性能，和进步数据传播是为WebGIS的向量数据压缩算法的最重要的要求。满足这些要求，我们在场一条新压缩途径。这篇论文由把漂流坐标变换成整数坐标以多尺度的数据的产生开始。在屏幕上的变换的点和原来的点之间的距离在2个象素以内，这被证明，因此，我们的途径对顾客方面上的向量数据的可视化合适。整数坐标被传递给一个整数小浪变压器，并且高周波的系数由变压器生产了被正规哈夫曼代码编码。河数据和道路数据上的试验性的结果表明建议途径的有效性：为河数据的压缩比率罐头活动范围10%和20%为道路数据分别地。我们断定更多的注意需要被付到在包含一些点的弯曲之间的关联。

简介：它仅仅是能在数据被存储的真实世界的可见部分。为如此的不完全、组织病的数据，结晶的数据瞄准atpresenting在包括unobservable事件的事件之中的隐藏的结构。，这被数据结晶化认识到哑巴项目，相应于unobservable事件的潜在的存在，被插入到给定的数据。有可见事件的这些哑巴项目和他们的关系被applyingKeyGraph与哑巴项目设想到数据，象灰尘涉及水分子的结晶化的形成的雪的结晶化一样。为调节要设想的结构的颗粒度水平，数据结晶化的工具与人在真实世界上理解重要情形的过程是综合的。这个基本方法被期望为机会发现的以前的方法带人到成功的决策的各种各样的真实世界领域适用。在这篇论文，我们在一个真实公司与human-interactiveannealing(DCHA)把数据结晶化用于产品的设计。结果显示出它的效果到工业决策。

简介：Thisresearchtakestheviewthatthemodellingoftemporaldataisafundamentalsteptowardsthesolutionofcapturingsemanticsoftime.Theproblemsinherentinthemodellingoftimearenotuniquetodatabaseprocessing.Therepresentationoftemporalknowledgeandtemporalreasoningarisesinawiderangeofotherdisciplines.Inthispaperanaccountisgivenofatechniqueformodellingthesemanticsoftemporaldataanditsassociatednormalizationmethod.ItdiscussesthetechniquesofprocessingtemporaldatabyemployingaTimeSequence(TS)datamodel.Itshowsanumberofdifferentstrategieswhichareusedtoclassifydifferentdatapropertiesoftemporaldata,anditgoesontodevelopthemodeloftemporaldataandaddressesissuesoftemporaldataapplicationdesignbyintroducingtheconceptoftemporaldatanormalisation.

简介：GeographicalInformationSystem(GIS)iswidelyusedinmanyfields.Withtherapiddevelopmentofcomputernetwork,GISuserscaremoreaboutdatasharinginnetworks.Intraditionalrelationaldatabase,dataconsistencywascontrolledbyconsistencycontrolmechanismwhenadataobjectislockedinasharingmode,othertransactionscanonlyreadit,butcannotupdateit.Thisisappropriateintraditionalrelationaldatabasesthatstoreattributedataandmainlydealwithshorttransactions.Inspatialdatabases,becauseofvastamountofdataandcomplextopologicalrelations,longtransactionaremetfrequently.Ifthetraditionalconsistencycontrolmethodhasbeenusedyet,thesystem'sconcurrencywillbebadlyinfluenced.SotherecomemanynewrequirementsfortheconsistencycontrolinthefieldofGIS.Therearemanyaspectsofdataconsistencyproblemsinspatial　databases,suchastheinconsistencybetweenattributeandgeometrydata;theinconsistencyoftopologicalrelationsaftergeometryobjectshasbeenmodified.Inthispaper,othertwocasesofdataconsistencyarediscussedinMulti_userGeographicalInformationSystem.　　InGIS,therearemanyformsofdata,suchasgeometrydata,attribute,imagedata,andDEMdata.Inthispaper,weonlydiscussspatialgeometrydata.

简介：万维网上的地图数据的进步传播向用户提供自我适应的策略存取遥远的数据。它不仅加快网转移而且为信息提供一个有效航行指南获得。在这传播的关键技术在服务器地点上是空间数据和组织前的有效多重表示。这份报纸瞄准从三个方面调查一些限制的进步传播：服务器地点上的数据组织，在传播进程和数据的数据控制在联系顾客以后恢复。二策略，也就是联机的地图归纳和离线的地图归纳，为这种进步传播分别地被检验。

简介：ARGO－YBJ，aChinese-ItalianCollaboration,isgoingtofinishthefirststepoftheinstallationofthiscosmicraytelescopeconsistinginasinglelayerofRPCs,placedat4300m.elevation,inTibet,Thedetectorwillprovideadetailedspace-timepictureoftheshowersfront,initiatedbyprimariesofenergiesintherange10GeV-500TeV.Thedatatakingwillstartatthebeginningof2002withafractionofthedetectorinstalled.willbeupgradedtwotimes,beingcompletedattheendof2003,Inthispaperwebrieflydescribethedataflow,thetriggerorganization,thethreeoperationalstepsindatatakingandthecomputingmodeltoprocessthedata.theneedofremotemonitoringoftheexperimentwillbetouchedupon.TheprocessingpowerfortherawdatareconstructionandfortheMonteCarlosimulationisreported.

简介：Receiveroperatingcharacteristic(ROC)curvesareoftenusedtostudythetwosampleprobleminmedicalstudies.However,mostdatainmedicalstudiesarecensored.UsuallyanaturalestimatorisbasedontheKaplan-Meierestimator.InthispaperweproposeasmoothedestimatorbasedonkerneltechniquesfortheROCcurvewithcensoreddata.Thelargesamplepropertiesofthesmoothedestimatorareestablished.Moreover,deficiencyisconsideredinordertocomparetheproposedsmoothedestimatoroftheROCcurvewiththeempiricalonebasedonKaplan-Meierestimator.ItisshownthatthesmoothedestimatoroutperformsthedirectempiricalestimatorbasedontheKaplan-Meierestimatorunderthecriterionofdeficiency.Asimulationstudyisalsoconductedandarealdataisanalyzed.

简介：Thepurposeofthepresentpaperistocallforattentiontothefollowingquestion:Whichoftheinitialdata(nonsmall)admitglobalsmoothsolutionstotheCauchyproblemfornonlinearwaveequations.Afewcasesandexamplesaresketched,showingthatthegeneralanswerofthisquestionmaybequitecomplicated.

简介：Thispaperpresentsamethodologytodeterminethreedataquality(DQ)riskcharacteristics:accuracy,comprehensivenessandnonmembership.Themethodologyprovidesasetofquantitativemodelstoconfirmtheinformationqualityrisksforthedatabaseofthegeographicalinformationsystem(GIS).FourquantitativemeasuresareintroducedtoexaminehowthequalityrisksofsourceinformationaffectthequalityofinformationoutputsproducedusingtherelationalalgebraoperationsSelection,Projection,and...