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arXiv 2101.12151q-bio.PEphysics.med-phphysics.soc-ph
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COVID-19传染病模型的振动自组织

Self-organization of oscillation in an epidemic model for COVID-19

Takashi Odagaki

摘要:

在房室模型的基础上,研究了当感染个体数净变化率$λ$由$λ$-$I$平面上的椭圆给出时的流行病曲线,该椭圆在$[I_{\ell}, I_h]$中得到支持.利用$a \equiv (I_h - I_{\ell})/(I_h + I_{\ell})$,表明(1)当$a < 1$或$I_{\ell} >0$时,感染曲线的振荡是自组织的,并且振荡的周期与$ (I_h - I_{\ell})$之差与$I_h$和$I_{\ell}$的几何平均数$\sqrt{I_h I_{\ell}}$的比值成比例;(2)当$a = 1$时,感染曲线示出临界行为,其中在峰值之后的长时间限制内它服从具有指数$-2$的幂律函数衰减,以及(3)当$a > 1$,感染曲线在峰值之后的长时间极限内呈指数衰减。目前的结果表明,可以通过使$I_{\ell} < 0$。

英文摘要:

On the basis of a compartment model, the epidemic curve is investigated when the net rate $λ$ of change of the number of infected individuals $I$ is given by an ellipse in the $λ$-$I$ plane which is supported in $[I_{\ell}, I_h]$. With $a \equiv (I_h - I_{\ell})/(I_h + I_{\ell})$, it is shown that (1) when $a < 1$ or $I_{\ell} >0$, oscillation of the infection curve is self-organized and the period of the oscillation is in proportion to the ratio of the difference $ (I_h - I_{\ell})$ and the geometric mean $\sqrt{I_h I_{\ell}}$ of $I_h$ and $I_{\ell}$, (2) when $a = 1$, the infection curve shows a critical behavior where it decays obeying a power law function with exponent $-2$ in the long time limit after a peak, and (3) when $a > 1$, the infection curve decays exponentially in the long time limit after a peak. The present result indicates that the pandemic can be controlled by a measure which makes $I_{\ell} < 0$.

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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