简介:Thecoordinationproblemofasupplychaincomprisingonesupplierandoneretailerundermarketdemanddisruptionisstudiedinthisarticle.Anovelexponentialdemandfunctionisadopted,andthepenaltycostisintroducedexplicitlytocapturethedeviationproductioncostcausedbythemarketdemanddisruption.Theoptimalstrategiesareobtainedfordifferentdisruptionscaleunderthecentralizedmode.Forthedecentralizedmode,itisprovedthatthesupplychaincanbefullycoordinatedbyadjustingthepricediscountpolicyappropriatelywhendisruptionoccurs.Furthermore,theauthorspointoutthatsimilarresultscanbeestablishedformoregeneraldemandfunctionsthatrepresentdifferentmarketcircumstancesifcertainassumptionsaresatisfied.
简介:Thispaperisconcernedwiththestatisticalmodelingofthedependencestructureofmultivariatefinancialdatausingthecopula,andtheapplicationofcopulafunctionsinVaRvaluation.Aftertheintroductionofthepurecopulamethodandthemaximumandminimummixturecopulamethod,authorspresentanewalgorithmbasedonthemoregeneralizedmixturecopulafunctionsandthedependencemeasure,andapplythemethodtotheportfolioofShanghaistockcompositeindexandShenzhenstockcomponentindex.Comparingwiththeresultsfromvariousmethods,onecanfindthatthemixturecopulamethodisbetterthanthepureGaussiancopulamethodandthemaximumandminimummixturecopulamethodondifierentVaRlevel.
简介:Amathematicalmodelofapredator-preymodelwithIvlev'sfunctionalresponseconcerningintegratedpestmanagement(IPM)isproposedandanalyzed.Weshowthatthereexistsastablepest-eradicationperiodicsolutionwhentheimpulsiveperiodislessthansomecriticalvalues,Furthermore,theconditionsforthepermanenceofthesystemaregiverl.Byusingbifurcationtheory,weshowtheexistenceandstabilityofapositiveperiodicsolution.Theseresultsarequitedifferentfromthoseofthecorrespondingsystemwithoutimpulses.Numericalsimulationshowsthatthesystemweconsiderhasmorecomplexdynamicalbehaviors.Finally,itisprovedthatIPMstrageyismoreeffectivethantheclassicalone.
简介:建立了一维p-laplacian方程(1)的一切解均为非振动的必要条件.所得定理改进了Kusano等在文[4]中的相应结果.