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arXiv 1602.01501math.PR
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具有随机感染率的非齐性总体网络上的传染病

Epidemics on networks with heterogeneous population and stochastic infection rates

Stefano Bonaccorsi, Stefania Ottaviano

摘要:

在本文中,我们研究了一个SIS型流行病在网络上的随机环境下,进入的节点的感染率的定义。相应地,我们以独立随机过程的形式对感染率进行建模。为了分析这个问题,我们应用平均场近似,它允许得到一个随机微分方程的概率在每个节点的感染,和经典的稳定性,这需要找到合适的李雅普诺夫函数的工具。在这里,我们找到的条件,保证,分别灭绝和随机持久的流行病。我们表明,存在两个区域,给定的系数的模型,一个系统几乎肯定会灭绝,和其他的地方,它是随机永久的。不幸的是,这两个区域并不相邻,因为它们之间存在间隙,其延伸取决于特定的噪声水平。在这最后一个区域,我们进行数值分析,建议的真正行为的解决方案。

英文摘要:

In this paper we study the diffusion of an SIS-type epidemics on a network under the presence of a random environment, that enters in the definition of the infection rates of the nodes. Accordingly, we model the infection rates in the form of independent stochastic processes. To analyze the problem, we apply a mean field approximation, which allows to get a stochastic differential equations for the probability of infection in each node, and classical tools about stability, which require to find suitable Lyapunov's functions. Here, we find conditions which guarantee, respectively, extinction and stochastic persistence of the epidemics. We show that there exists two regions, given in terms of the coefficients of the model, one where the system goes to extinction almost surely, and the other where it is stochastic permanent. These two regions are, unfortunately, not adjacent, as there is a gap between them, whose extension depends on the specific level of noise. In this last region, we perform numerical analysis to suggest the true behavior of the solution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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