简介:Althoughthegreyforecastingmodelhasbeensuccessfullyadoptedinvariousfieldsanddemonstratedpromisingresults,theliteraturesshowitsperformancecouldbefurtherimproved,suchasfortheDGM(1,1)model,basedonaconcavesequence,themodelingerrorwillbelarger.Inthispaper,firstlythedefinitionofsequenceconvexityisgivenout,anditisprovedthattheoutputsequenceofDGM(1,1)modelisaconvexsequence.Next,theresidualchangelawofDGM(1,1)modelbasedontheconcavesequenceisdiscussed,andthenon-equidistanceDGM(1,1)modelisproposed.Finally,byintroducingthesymmetrytransformation,aconcavesequenceistransformedintoaconvexsequence,calledthesymmetricsequenceoftheconcavesequence,andthenconstructthenon-equidistanceDGM(1,1)modelbasedontheconvexsequence.Theexampleresultsshowthatthenovelmethodismoreaccuratethanthedirectmodelingforaconcavesequence.
简介:Inthispaper,westudytheexistenceof0-1universalminimaltotaldominatingfunctionsinagraph.Weestablishaformulationoflinearinequalitiestocharacterizeuniversalminimaltotaldominatingfunctionsandshowthatforakindofgraphswhoseadjacentmatricesarebalanced,theexistenceofuniversalminimaltotaldominatingfunctionscoincideswiththatof0-1ones.Itisalsoprovedthatforgeneralgraphs,theproblemoftestingtheexistenceof0-1universalminimaltotaldominatingfunctionsisNP-hard.
简介:Inthispaper,weanalyzeabulkinputM[X]/M/1queuewithmultipleworkingvacations.Aquasiuppertriangletransitionprobabilitymatrixoftwo-dimensionalMarkovchaininthismodelisobtained,andwiththematrixanalysismethod,highlycomplicatedprobabilitygeneratingfunction(PGF)ofthestationaryqueuelengthisfirstlyderived,fromwhichwegotthestochasticdecompositionresultforthestationaryqueuelengthwhichindicatestheevidentrelationshipwiththatoftheclassicalM[X]/M/1queuewithoutvacation.ItisimportantthatwefindtheupperandthelowerboundsofthestationarywaitingtimeintheLaplacetransformorderusingthepropertiesoftheconditionalErlangdistribution.Furthermore,wegainthemeanqueuelengthandtheupperandthelowerboundsofthemeanwaitingtime.
简介:IntheexistingliteratureofRepairableQueueingSystems(RQS),i.e.,queueingsystemswithserverbreakdowns,itisalmostallassumedthatinterarrivaltimesofsuccessivecustomersareindependent,identicallyexponentiallydistributed.Inthispaper,wedealwithmoregenericsystemGI/PH/1withserver'sexponentialuptimeandphase-typerepairtime.Withmatrixanalysistheory,weestablishtheequilibriumconditionandthecharacteristicsofthesystem,derivethetransientandstationaryavailabilitybehaviorofthesystem.
简介:摘要本文结合自动站观测资料、NCEP再分析资料以及常规资料等,对2015年6月3日出现在阿坝州的一次强对流天气过程进行分析,结果表明此次强对流天气出现的大气环流背景条件为两槽两脊型,冰雹、雷暴天气是在中低纬地区纬向环流形势下,副高、切变线、低槽和中尺度辐合线等系统的共同作用下形成的。西南水汽的持续供应以及较强水汽辐合的共同影响为为阿坝州地区此次强对流天气的出现提供了丰富的水汽供应条件。强劲的上升运动将低层辐合的水汽抬升至200hPa处,对流云持续在高空区域发展,推动了不稳定能量的持续释放,为强对流天气的发生给予了有利的动力条件,此外,中低层大气的持续对流性不稳定给予了较好的热力条件。
简介:摘要本文介绍了D3-Edit及Dauric2.43系统环境,并详细阐述了D3-Edit及Dauric2.43系统在电视天气预报制作的实现及解决方法等内容进行论述。
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简介:Inthispaper,wegiveanorder-preserving,isometricandisomorphicembeddingoperatorfromthefuzzynumberspaceE~1toaclassicalBanachspaceandshowsomenecessaryandsufficientintegrabilityconditionsoffuzzyintegralswhichweredefinedbyM.MatlokaandO.Kalevabymeansofsuchanoperator.
简介:摘要本文利用常规观测资料、NCEP再分析资料等相关资料,对班戈县2017年3月11-12日降雪天气过程分析。结果表明此次降雪天气过程由500hPa高空槽、南支槽、“歪脖子”高压及700hpa低涡、切变线、低空急流风速带,偏北气流、东风气流以及西南暖湿气流辐合,850hpa低层“冷垫”抬升和地面冷锋共同配置产生。500hPa高度场的西南气流给予对流层较弱辐合区及弱水汽输送。主要水汽输送源于700hPa下方区域偏南气流,并且700hPa处低涡及切变线导致对流层中低层强辐合场,高层辐散抽吸及低层辐合上升,促使较强上升运动产生,为此次降雪天气发生提供有利动力抬升条件。班戈县对流层湿度较大且湿层厚,上升运动强烈,达大雪量级。
简介:摘要利用祁连山区9站1960~2004年45年冬季最大冻土资料,分析了祁连山区冬季冻土的时间变化及影响因素,并对比分析了冻土深年和冻土浅年高空环流特征。结果表明祁连山区冬季最大冻土深度的年际变化呈现逐渐减小趋势,其减小速率为7.11cm/10a,可靠性通过了0.001信度检验;冻土深度与气温是呈反相关关系,冻土深度随气温的升高而减小,气温对祁连山区东部山区影响最为明显,其次是西部山区,影响最小的是中部山区;冻土深年,新疆脊较正常年份强,且偏西,高空气温较正常年份高,而OLR较正常年份强;冻土浅年,新疆脊较正常年份弱,气温较正常年份低,OLR较正常年份弱。
简介:Thispaperanalyzesafinite-bufferrenewalinputsingleserverdiscrete-timequeueingsystemwithmultipleworkingvacations.Theserverworksatadifferentrateratherthancompletelystoppingworkingduringthemultipleworkingvacations.Theservicetimesduringaserviceperiod,servicetimeduringavacationperiodandvacationtimesaregeometricallydistributed.ThequeueisanalyzedusingthesupplementaryvariableandtheimbeddedMarkov-chaintechniques.Weobtainsteady-statesystemlengthdistributionsatpre-arrival,arbitraryandoutsideobserver'sobservationepochs.Theanalysisofactualwaiting-timedistributionandsomeperformancemeasuresarecarriedout.Wepresentsomenumericalresultsanddiscussspecialcasesofthemodel.