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arXiv 1005.2372q-bio.PE
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具有季节强迫的传染病模型中的随机放大

Stochastic amplification in an epidemic model with seasonal forcing

Andrew J Black, Alan J McKane

摘要:

本文研究了具有时变强迫的随机传染-恢复(SIR)模型,分析了随机性和外部强迫的相互作用。该模型被制定为一个连续的时间马尔可夫过程,这是分解成一个确定性的动态与随机校正,通过使用逆系统大小的扩展。强迫诱导的确定性动力学中的极限环,并给出了完整的分析波动的时间依赖的解决方案。当极限周期为一年时,以及当极限周期为两年时,在周期加倍之后,应用该分析。我们的方法的全面性使我们能够给出一个连贯的动态画面,统一过去的工作,但也提供了一个系统的方法来预测百日咳和麻疹流行病的振荡周期。

英文摘要:

We study the stochastic susceptible-infected-recovered (SIR) model with time-dependent forcing using analytic techniques which allow us to disentangle the interaction of stochasticity and external forcing. The model is formulated as a continuous time Markov process, which is decomposed into a deterministic dynamics together with stochastic corrections, by using an expansion in inverse system size. The forcing induces a limit cycle in the deterministic dynamics, and a complete analysis of the fluctuations about this time-dependent solution is given. This analysis is applied when the limit cycle is annual, and after a period-doubling when it is biennial. The comprehensive nature of our approach allows us to give a coherent picture of the dynamics which unifies past work, but which also provides a systematic method for predicting the periods of oscillations seen in whooping cough and measles epidemics.

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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