简介:Thispaperstudiestherelationshipbetweentwoprincipaltoolsfortheanalysisofnetworktraffic,namely,effectivebandwidthandnetworkcalculus.Itisshownthatageneralformulationofeffectivebandwidthcanbeexpressedwithintheframeworkofaprobabilisticversionofthenetworkcalculus,wherebotharrivalsandservicearespecifiedintermsofprobabilisticbounds.Aggregateschedulingwithstatisticalserviceassurancesbasedonstatisticalnetworkcalculusispresentedbystrongeffectiveenvelopefunction,insteadofcommonlyusedeffectiveenvelopetoobtainboundsontheamountoftrafficonalink,theproposedschemecanovercometheoverestimationofthenumberofadmittedflows,whichmakesitsuperiortothepreviousschemeespeciallywhenimplementingcalladmissioncontrol.
简介:Statisticalapproachesforevaluatingcausaleffectsandfordiscoveringcausalnetworksarediscussedinthispaper.Acausalrelationbetweentwovariablesisdifferentfromanassociationorcorrelationbetweenthem.Anassociationmeasurementbetweentwovariablesandmaybechangeddramaticallyfrompositivetonegativebyomittingathirdvariable,whichiscalledYule-Simpsonparadox.WeshalldiscusshowtoevaluatethecausaleffectofatreatmentorexposureonanoutcometoavoidthephenomenaofYule-Simpsonparadox.Surrogatesandintermediatevariablesareoftenusedtoreducemeasurementcostsordurationwhenmeasurementofendpointvariablesisexpensive,inconvenient,infeasibleorunobservableinpractice.Therehavebeenmanycriteriaforsurrogates.However,itispossiblethatforasurrogatesatisfyingthesecriteria,atreatmenthasapositiveeffectonthesurrogate,whichinturnhasapositiveeffectontheoutcome,butthetreatmenthasanegativeeffectontheoutcome,whichiscalledthesurrogateparadox.Weshalldiscusscriteriaforsurrogatestoavoidthephenomenaofthesurrogateparadox.Causalnetworkswhichdescribethecausalrelationshipsamongalargenumberofvariableshavebeenappliedtomanyresearchfields.Itisimportanttodiscoverstructuresofcausalnetworksfromobserveddata.Weproposearecursiveapproachfordiscoveringacausalnetworkinwhichastructurallearningofalargenetworkisdecomposedrecursivelyintolearningofsmallnetworks.Furthertodiscovercausalrelationships,wepresentanactivelearningapproachintermsofexternalinterventionsonsomevariables.Whenwefocusonthecausesofaninterestoutcome,insteadofdiscoveringawholenetwork,weproposealocallearningapproachtodiscoverthesecausesthataffecttheoutcome.
简介:统计生态学与分析技术和方法的前进很快发展。这份报纸在后面的方面在中国关于统计生态学做了评论:数据收集,空间并且时间模式分析,种类丰富和种类区域关系,人口动态,种类亲密关系,社区类似和社区簇分析,和社区分类。
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简介:与从在1970和2001之间的热带气旋年鉴的数据,统计分析被执行学习气候的特征乍见陆地TC(作为TCshereafter注意了)在有详细规格的中国,注意集中于乍见陆地频率,地点,支撑,腐烂,转变,增强和驱散等等。结果显示在土地上的TC的支撑的时期是相当不同的为不同乍见陆地看到,并且从Guangxito浙江增加了。TC紧张的最明显的减少主要在12个小时以内发生在以后乍见陆地。TC越强壮,它越腐烂。TC是的在上区域驱散罐头嬉痞的集会Heilongjiang,极北,并且云南,最西。而且,Guangxi是有高作为与另外的沿海的区域相比驱散率和题目到TC驱散的一个区域。
简介:ymboliccircuitsimulatoristraditionallyappliedtothesmall-signalanalysisofanalogcircuits.Thispaperestablishesasymbolicbehavioralmacromodelingmethodapplicabletobothsmall-signalandlarge-signalanalysisofgeneraltwo-stageoperationalamplifiers(op-amps).Theproposedmethodcreatesatwo-poleparametricmacromodelwhoseparametersareanalyticalfunctionsofthecircuitelementparametersgeneratedbyasymboliccircuitsimulator.Amomentmatchingtechniqueisusedinderivingtheanalyticalmodelparameter.Thecreatedparametricbehavioralmodelcanbeusedforop-ampsperformancesimulationinbothfrequencyandtimedomains.Inparticular,theparametricmodelsarehighlysuitedforfaststatisticalsimulationofop-ampsinthetime-domain.Experimentresultsshowthatthestatisticaldistributionsoftheop-ampslewandsettlingtimecharacterizedbytheproposedmodelagreewellwiththetransistor-levelresultsinadditiontoachievingsignificantspeedup.
简介:StatisticalMechanicsModelofLiquidBinaryAiloyFanChengcai,WangJianandLiWenchao(樊成才)(王俭)(UniversityofScienceandTechnologyBeijing...
简介:Basedonstatisticsprinciple,randomerrorandsystematicerrorwereconsideredandthevolumetricpropertiesofthetwomixturestypes,namelyAandB,werestatisticallyanalyzedusingdifferentdistributionmethods.Seventy-twosamplesofmixtureAandfifty-twoofmixtureBwerefabricatedusingtheMarshallmethod.Theprobabilitydistributionswerecomparedonthebasisofgoodnessoffit.Weibullmodelwasfoundtobemostappropriatemodelfordescribingtheasphaltmixturesvolumetricpropertiesdistribution.Thetwo-parameterWeibulldistributionfunctionappliedwelltomodelthebulkspecificgravityandvoidsfilledwithasphaltdata,whereas,thethree-parameterWeibulldistributionappearedtobemoreappropriateinthediscussingofairvoidsandvoidsinmineralaggregate.Theexperimetalresultsisrevealedthatcomparedwiththemeanvalue,thepeakvalueofWeibulldistributionwassuggestedasanalternativeandmorepowerfulparameterfordescribingthetestdatadistributioncharacteristic.Theanalysisoftestresultsalsorevealedthatthereweresignificantdifferencesinthevolumetricpropertiesofthetwotestedmixturesforthesameconfidencelevel.Theconfidenceintervaldecreasedwiththedecreasinginreliability.
简介:RegistrationStatusofEnterprisesEnterprisesareclassifiedinto3categories,namelydomestic-fundedenterprises,enterpriseswithinvestmentfromHongKong,MacauandTaiwan,andenterpriseswithforeigninvestment,inthelightoftheregistrationstatusofanenterpriseinindustrialandcommercialadministrationagencies.Domestic-fundedenterprises