吉林大学学报(理学版)

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 随机SIQS传染病系统的灭绝性和遍历性

赵亚男1, 王宇2, 夏兰3, 张晓颖1   

  1. 1. 长春大学 理学院, 长春 130022; 2. 长春汽车经济技术开发区第四中学, 长春 130011;3. 吉林交通职业技术学院 基础部, 长春 130012
  • 收稿日期:2013-06-03 出版日期:2013-11-26 发布日期:2013-11-21
  • 通讯作者: 赵亚男 E-mail:zhaoyn111@163.com

Extinction and Ergodicity of Stochastic SIQS Epidemic System

ZHAO Yanan1, WANG Yu2, XIA Lan3, ZHANG Xiaoying1   

  1. 1. College of Science, Changchun University, Changchun 130022, China;2. Changchun Automobile EconomicTechnological Development Area No.4 Middle School, Changchun 130011, China;3. Department of Foundation, Jilin Communications Polytechnic, Changchun 130012, China
  • Received:2013-06-03 Online:2013-11-26 Published:2013-11-21
  • Contact: ZHAO Yanan E-mail:zhaoyn111@163.com

摘要:

考虑在环境白噪声干扰下建立的随机SIQS传染病系统, 当基本再生数不大于1时, 利用随机Lyapunov分析方法给出了随机系统围绕确定性系统无病平衡点的渐近行为. 结果表明, 当白噪声较小时, 疾病将灭绝. 当基本再生数大于1时, 利用Hasminskii的遍历性证明了随机系统存在平稳分布, 且是遍历的, 反映了在一定条件下, 疾病将流行.

关键词: 随机微分方程, 灭绝性, 遍历性, Lyapunov函数, 平稳分布

Abstract:

Authors discussed the stochastic SIQS epidemic system with environmental white noise. When the basic reproduction number was not more than 1, we gave the asymptotic behavior of the stochastic system around the diseasefree equilibrium point of the deterministic model by stochastic Lyapunov analysis method. The result shows that the disease will die out when the white noises are small. When the basic reproduction number is more than 1, it is shown that
 there is a stationary distribution based on the Hasminskii’s ergodic theory and it is ergodic, which reveals that the disease will prevail under some conditions.

Key words: stochastic differential equation, extinction, ergodicity, Lyapunov function, stationary distribution

中图分类号: 

  • O211.63