简介：ThispaperpresentsanewPulseWidthModulation(PWM)controllerforUnmannedAerialVehicle(UAV)precisionsprayerforagricultureusingaTL494fixed-frequencypulsewidthmodulatortogetherwithadataacquisitionboardanddevelopedsoftware.AnUAVcanberemotelycontrolledorflownautonomouslybypre-programmedflightplans.ThePWMcontrollerwasimplementedthroughtheguidancesystemontheUAVwithcontrolcommandssentbetweentheUAVhelicopterandthegroundcontrolstationviaawirelesstelemetrysystem.ThePWMcontrollerwastestedandvalidatedusingLabVIEW8.2.Severalanalyseswereperformedinalaboratorytotestdifferentcontrolsignals.TheresultsshowthatthePWMcontrollerhaspromiseasahigherprecisiontechniqueforsprayapplications,whichwillimproveefficiencyofpesticideapplication,especiallyincropproductionareas.

简介：Itisveryimportantinthefieldofbioinformaticstoapplycomputertoperformthefunctionannotationfornewsequencedbio-sequences.BasedonGOdatabaseandBLASTprogram,anovelmethodforthefunctionannotationofnewbiologicalsequencesispresentedbyusingthevariable-precisionroughsettheory.TheproposedmethodisappliedtotherealdatainGOdatabasetoexamineitseffectiveness.Numericalresultsshowthattheproposedmethodhasbetterprecision,recall-rateandharmonicmeanvaluecomparedwithexistingmethods.