简介:TheCDFexperimentstarteddatatakinginApril2001,Thedataareorganizedintodatasetswhichcontaineventsofsimilarphysicspropertiesandreconstructionversion.theinformationaboutdatasetsisstoredintheDataFileCatalog,arelationaldatabase.Thisinformationispresentedtothedataprocessingframeworkasobjectswhichareretrievedusingcompoundkeys.Theobjectsandthekeysaredesignedtobethealgorithms'viewofinformationstoredinthedatabase.ObjectsmayuseseveralDBtables.Adatabaseinterfacemanagementlayerexistsforthepurposeofmanagingthemappingofpersistentdatatotransientobjectsthatcanbeusedbytheframework.Thislayerexistsbetweenthealgorithmcodeandthecodewhichreadsdirectlyfromdatanbasetables.Attheuserend,itplacesget/putinterfaceonatopofatransientclassforretrievalorstorageofobjectsofthisclassusingakey.DataFileCatalogcodemakesuseofthisfacilityandcontainsallthecodeneededtomanipulateCDFDataFileCatalogfromaC++programorfromthecommandprompt,ItsupportsanOracleinterfaceusingOTL,andamSQLinterface,ThiscodeandtheOravcleimplementationofDataFileCatalogweresubjectedtotestduringCDFCommissioningRunlastfallandduringfirstweeksofRunIIinApril.Itperformedexceptionallywell.
简介:JeffersonLabhasimplementedascalable,distributed,highperformancemassstoragesystem-JASMine.ThesystemisentirelyimplementedinJava,providesaccesstorobotictapestorageandincludesdiskcacheandstagemanagercomponents.Thediskmanagersubsystemmaybeusedindependentlytomanagestand-alonediskpools.Thesystemincludesaschedulertoprovidepolicy-basedaccesstothestoragesystems.Securityisprovidedbypluggableauthenticationmodulesandisimplementedatthenetworksocketlevel.Thetapeanddiskcachesystemshavewelldefinedinterfacesinordertoprovidsintegrationwithgrid-basedservices.Thesystemisinproductionandbeingusedtoarchive1TBperdayfromtheexperiments.andcurrentlymovesover2TBperdaytotal.ThispaperwilldescribethearchitectureofJASMine;discusstherationaleforbuildingthesystem,andpresentatransparent3^rdpartyfilereplicationservicetomovedatatocollab-oratinginstitutesusingJASMine,XML,andservlettechnologyinterfacingtogrid-basedfiletransfermechanisms.
简介:Aninformationhidingalgorithmisproposed,whichhidesinformationbyembeddingsecretdataintothepaletteofbitmapresourcesofportableexecutable(PE)files.Thisalgorithmhashighersecuritythansometraditionalonesbecauseofintegratingsecretdataandbitmapresourcestogether.ThroughanalyzingtheprincipleofbitmapresourcesparsinginanoperatingsystemandthelayerofresourcedatainPEfiles,asafeandusefulsolutionispresentedtosolvetwoproblemsthatbitmapresourcesareincorrectlyanalyzedandotherresourcesdataareconfusedintheprocessofdataembedding.Thefeasibilityandeffectivenessoftheproposedalgorithmareconfirmedthroughcomputerexperiments.
简介:这篇文章描述在一个无线网孔网络分享系统的一个合作文件的一个新模型。作者的途径是开发基于机会主义的随机的线性网络编码分享机制的一个有效、合作的文件。在这机制以内,每个节点根据合作优先级播送它的包的随机的线性联合,它根据对它的邻居节点的节点可能的贡献以一种分布式的方式被计算。与这机制,一个节点越贡献其它,节点越有机会首先恢复全部文件。这里的兴趣的表演度量标准是:延期被送到直到在一个文件的所有包所有节点,和一种理想的包尺寸,由作者能得到最小的传播延期的使用。没有随机的线性网络编码,通过广泛的模拟,作者在一个无线网孔网络把他们的机制与当前的传播进程作比较。作者发现用他们的机制,节点能合作地与更少的传播时间分享全部文件并且没有随机的线性网络,比当前的传播进程推迟。
简介:BABAR[1]usestwoformatsforitsdata:ObjectivitydatabaseandROOT[1]files.Thisposterconcernsthedistributionofthelatter-forObjectivitydatasee[3].TheBABARanalysisdataisstoredinROOTfiles-oneperphysicsrunandanalysisselectionchannel-maintainedinalargedirectorytree,CurrentlyBABARhasmorethan4.5TBytesin200,000ROOTfiles.Thisdatais(mostly)producedatSLAC,butisrequiredforanalysisatuniversitiesandresearchcentresthroughouttheUSandEurope.TwobasicproblemsconfrontuswhenweseektoimportbulkdatafromSLACtoaninstitute'slocalstorageviathenetwork.Wemustdeterminewhichfilesmustbeimported(dependingonthelocalsiterequirementsandwhichfileshavealreadybeenimported),andwemustmaketheoptimumuseofthenetworkwhentransferringthedata,Basicftp-liketools(ftp,scp,etc)donotattempttosolvethefirstproblem.Moresophisticatedtoolslikersync[4],thewidely-usedmirror/synchronisationprogram,comparelocalandremotefilesystems,checkingforchanges(basedonfiledate,sizeand,ifdesired,anelaboratechecksum)inordertoonlycopynewormodifiedfiles,Howeverrsyncallowsforonlylimitedfileselection.Alsowhen,asinBABAR,anextremelylargedirectorystructuremustbescanned,rsynccantakeseveralhoursjusttodeterminewhichfilesneedtobecopied.Althoughrsync(andscp)provideson-the=flycompression,itdoesnotallowustooptimisethenetworktransferbyusingmultiplestreams,abjustingtheTCPwindowsizeorseparatingencryptedauthenticationfromunencrypteddatachannels.
简介:这篇文章集中于识别分享文件对等(P2P)(例如BitTorrent(BT))在一个树桩网络的边阶的交通。由分析应用程序的协议和交通,一个单身的用户的分享文件的P2P交通与极大地不同,这被发现传统并且另外的P2P(例如QQ)申请在深奥远程主机和遥远的端口的分发的交通。因此,一个方法基于远程主机(RHD)的组件和遥远的港口(RPD)的组件被建议识别象BT一样交通。这个方法仅仅在一个树桩网络依靠每台用户主机的流动信息,并且没有包收费载重需要被监视。在间隔,为并发的传播控制协议的立刻的RHD和为每台主机的用户数据包协议流动通过由每流动的远程主机属于的树桩网络组织流动分别地是计算的。在给定的条件上,立刻的RPD通过由遥远的港口组织流动修改立刻的RHD被计算。一位主人是否一直在使用象BT一样应用,能为时间的一个时期从立刻的RHD或平均RHD被推出。基于交通,特征是对比基于内容的方法识别变化多端的分享文件的P2P交通合适的更多的建议方法。试验性的结果证明这个方法与高精确性是有效的。
简介:Thispaperproposedtheoptimizedthree-stagestrategyoforderlymanagementoffilestreaminnetworkprintingworkflow.Infirststagethecustomerpreflightwasaddedtotheconventionalprepresspreflight,whichsetquick-type,general-type,stable-typeandcomprehensive-typepreflightschemeforcustomersbyinvestigatingthepossibilityofoccurrenceoferrorsofvariouspreflightentriesandcustomerrelevancy.Basedonfourtypesofpreflightschemes,fourcustomerpreflightapplicationswerecreatedbyusingPitstopProandConnectorYou.Customerscanselectoneoftheappropriateapplicationsforquickpreflightbeforedeliveringtoreducetheprobabilityofreturningthefilesbackforcorrectionwhenerrorsoccurinpreflight.Secondstageisprintingenterpriseprepresspreflight,whichproposedtheconceptoftheprepresspreflighttolerance.Inaddition,accordingtothedifferentrequirementsofprintingtechnologyandquality,thispaperestablishedtheprepresspreflightschemebasedontheprintingenterprises’toleranceforpreflighterror.Thirdstageistomanagetheoptimizedsortingofprepressfilestream.Toachieveit,theSPTruleandthe0-1programmingmodelwereadopted,timespendofpreflight,printingprocessandpost-pressfinishingwasalsotakenintoaccount.Moreover,EnfocusSwitchsoftwarewasappliedtoestablishautomatednetworkprintingworkflowandcompletethefilestreamsorting.Finally,theresultofsimulationanalysisoftheoptimizedstrategyshowsthattheoptimizedthree-stagestrategycaneffectivelyshortenthefileprocessingtime.
简介:MYSQL注入中,load_file()函数在获得WebShell以及提权过程中起着十分重要的作用,常被用来读取如下所示的各种配置文件。