简介:CRITICALSTOPPINGTIMESANDSEMIMARTINGALESOFSTOCHASTICPROCESSESHuBijin(胡必锦)(DepartmentofMathematicsHUSTWuhan,HubeiP.R.C.3.1992)A...
简介:SupposethatCisafinitecollectionofpatterns.ObserveaMarkovchainuntiloneofthepatternsinCoccursasarun.Thistimeisdenotedbyτ.Inthispaper,weaimtogiveaneasywaytocalculatethemeanwaitingtimeE(τ)andthestoppingprobabilitiesP(τ=τA)withA∈C,whereτAisthewaitingtimeuntilthepatternAappearsasarun.
简介:Inthispaper,weprovetheexistenceanduniquenessforBackwardStochasticDifferentialEquationswithstoppingtimeastimehorizonunderthehypothesisthatthegeneratorisbounded.Wefirstproveforthestoppingtimewithfinitevaluesandforthegeneralstoppingtimeweprovetheresulttakinglimit.Wesuggestanewapproachtogeneralizetheresultsforthecaseofconstanttimehorizontothecaseofstoppingtimehorizon.
简介:Inthispaperwestudytheone-dimensionalreflectedbackwardstochasticdifferentialequationswhicharedrivenbyBrownianmotionaswellasamutuallyindependentmartingaleappearinginadefaultablesetting.Usingapenalizationmethod,weprovetheexistenceanduniquenessofthesolutionstotheseequations.Asanapplication,weshowthatunderproperassumptionsthesolutionofthereflectedequationisthevalueoftherelatedmixedoptimalstopping-controlproblem.
简介:Thestabilityofbuildingsonthesurfacewillbeinfluencedbyundergroundmining.Forthepurposesofsafeminingandbuildingsprotectingaroundminingarea,therockandsoildistortionshouldbeforecasted.Byusingtheresultsoftheelastic-finite-elementmethodsimulation,wecancalculatethetilting,horizontaldeformationandcurvatureofthesurfaceandthestrata.WushanCopperMinewastakenasanexampletoanalyzethereasonsofaccidentandbeyondstandardlimit,andtheinfluenceonthesafetyofthepackedvolumn.
简介:Theslidinggateusedtostopslagduringconvertertappingissimilartothecontrolofslidegateinladle,withtheslidinggatedeviceinstalledoutsidetheBOFtappingholetip.Owingtothequickopeningandclosing(in0.5s)oftheslidinggate,itcannotonlyeffectivelystopthepre-slagandpost-slagduringconvertertappingbutalsoautomaticallyjudgeandstopslagwiththehelpofAMEPAslagdetectingandPLCcontroltechnology.Currentlyitisregardedasthebestprocesstostopslagduringconvertertapping.