改进的Logistic模型预测人口数量8-19

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··20102:2010-01-14:(1981-),,,,、、。Logistic,(,471023):,,Logistic,1978-2008,10。:Malthus;Logistic;Logistic;:O241:A:1671-2153(2010)02-0044-020,,;。,,、、,。,,,10。1Malthus18,Malthus,1789,x(t)=x0ert,。,,、,,Malthus。2Logistic1840,Verhulst———Logistic,x(t)=Kx0x0+(K-x0)e-rt。,K;K-xK“”。K。《》1987-2008,Logistic,K≈149846.672,σ2=289649.455,R=0.9980。10,1。3LogisticLogistic:①r,;②K,12009-201820092010201120122013134125.718134835.125135515.941136169.013136795.18920142015201620172018137395.319137970.251138520.823139047.870139552.213JournalofNingboPolytechnic20104Apr,2010142Vol.14No.244··20102K。,,rtr(t),Logisticdxdt=r(t)x(K-xK),x(0)=x0。(1)r(t),r(t)=a+bt,x(t)=Kx0x0+(K-x0)e-(at+bt2)。Logistic,K≈135769.010,σ2=34687.063,R=0.9998。10,2;3。3,Logistic。(2)1/(a+bt)r(t),r(t)=1/(a+bt),x(t)=Kx0[]。,K≈171250.835,σ2=408242.883,R=0.9973,Logistic。4Logistic;Logistic,r(t),r(t),Logistic。r(t),。5Logistic,。,,、、、、,,、。:[1],,.[M].:,2003.[2].[M].:,2005.[3].Logistic[J].(),2006,22(5):58-59.[4],,.[J].(),2009,25(3):10-12.220092010201120122013132869.804133257.262133600.669133903.717134170.01520142015201620172018134403.046134606.129134782.401134934.792135066.0243LogisticLogisticLogisticLogistic/149846.672135769.010289649.45534687.0630.99800.9998PopulationarepredictedbytheimprovedLogisticmodelGUOShi-lei,WANGYun-peng(LuoyangInstituteofScienceandTechnology,Luoyang471023,China)Abstract:Thetwofamousmathematicalmodelaboutthepopulationproblemwereanalysed.Accordingtotheactualsituationinsociety,theLogisticmodelisimproved.Basedonthenumberofthepopulationfrom1978to2008,thepopulationofChinaarepredictedandanalyzedforthenexttenyears.Keywords:Malthusmodel;Logisticmodel;improvedLogisticmodel;predicted:Logisticx0+(K-x0)a1/b(a+bt)1/b/45

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