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arXiv 1812.03333math.DS
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随机SIR传染病模型的持久性和灭绝性

Permanence and Extinction for the Stochastic SIR Epidemic Model

N. H. Du, N. N. Nhu

摘要:

研究了自然死亡率和发病率均受白噪声扰动的具有一般关联函数响应的随机SIR方程。本文给出了一类具有多噪声的传染病系统\begin{equation*} \begin{cases} dS(t)=\big[a_1-b_1S(t)-I(t)f(S(t),I(t))\big]dt + σ_1 S(t) dB_1(t) -I(t)g(S(t),I(t))dB_3(t),\\ dI(t)=\big[-b_2I(t) + I(t)f(S(t),I(t))\big]dt + σ_2I(t) dB_2(t) + I(t)g(S(t),I(t))dB_3(t). \end{cases} \end{equation*}灭绝和持久的一个充分必要条件,并建立了解的全部收敛速度.给出了一些数值例子来说明我们的结果

英文摘要:

The aim of this paper is to study the stochastic SIR equation with general incidence functional responses and in which both natural death rates and the incidence rate are perturbed by white noises. We derive a sufficient and almost necessary condition for the extinction and permanence for an epidemic system with multi noises \begin{equation*} \begin{cases} dS(t)=\big[a_1-b_1S(t)-I(t)f(S(t),I(t))\big]dt + σ_1 S(t) dB_1(t) -I(t)g(S(t),I(t))dB_3(t),\\ dI(t)=\big[-b_2I(t) + I(t)f(S(t),I(t))\big]dt + σ_2I(t) dB_2(t) + I(t)g(S(t),I(t))dB_3(t). \end{cases} \end{equation*} Moreover, the rate of all convergences of the solution are also established. A number of numerical examples are given to illustrate our results

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