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简介：

简介：Thecoordinationproblemofasupplychaincomprisingonesupplierandoneretailerundermarketdemanddisruptionisstudiedinthisarticle.Anovelexponentialdemandfunctionisadopted,andthepenaltycostisintroducedexplicitlytocapturethedeviationproductioncostcausedbythemarketdemanddisruption.Theoptimalstrategiesareobtainedfordifferentdisruptionscaleunderthecentralizedmode.Forthedecentralizedmode,itisprovedthatthesupplychaincanbefullycoordinatedbyadjustingthepricediscountpolicyappropriatelywhendisruptionoccurs.Furthermore,theauthorspointoutthatsimilarresultscanbeestablishedformoregeneraldemandfunctionsthatrepresentdifferentmarketcircumstancesifcertainassumptionsaresatisfied.

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简介：Thispaperisconcernedwiththestatisticalmodelingofthedependencestructureofmultivariatefinancialdatausingthecopula,andtheapplicationofcopulafunctionsinVaRvaluation.Aftertheintroductionofthepurecopulamethodandthemaximumandminimummixturecopulamethod,authorspresentanewalgorithmbasedonthemoregeneralizedmixturecopulafunctionsandthedependencemeasure,andapplythemethodtotheportfolioofShanghaistockcompositeindexandShenzhenstockcomponentindex.Comparingwiththeresultsfromvariousmethods,onecanfindthatthemixturecopulamethodisbetterthanthepureGaussiancopulamethodandthemaximumandminimummixturecopulamethodondifierentVaRlevel.

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简介：Amathematicalmodelofapredator-preymodelwithIvlev'sfunctionalresponseconcerningintegratedpestmanagement(IPM)isproposedandanalyzed.Weshowthatthereexistsastablepest-eradicationperiodicsolutionwhentheimpulsiveperiodislessthansomecriticalvalues,Furthermore,theconditionsforthepermanenceofthesystemaregiverl.Byusingbifurcationtheory,weshowtheexistenceandstabilityofapositiveperiodicsolution.Theseresultsarequitedifferentfromthoseofthecorrespondingsystemwithoutimpulses.Numericalsimulationshowsthatthesystemweconsiderhasmorecomplexdynamicalbehaviors.Finally,itisprovedthatIPMstrageyismoreeffectivethantheclassicalone.

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