First order strong convergence of an explicit scheme for the stochastic SIS epidemic model

First order strong convergence of an explicit scheme for the stochastic SIS epidemic model
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随机 SIS 流行病模型显式方案的一阶强收敛

DOI:
10.1016/j.cam.2021.113482
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发表时间:
2021-08
影响因子:
2.4
通讯作者:
王小捷
王小捷
中科院分区:
数学2区
文献类型:
--
作者:
陈琳;甘四清;王小捷

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本文设计了一种新颖的显式时间步长方案,称为 Lamperti 平滑截断方案,以强烈近似随机 SIS 流行病模型,其求解过程采用有界域中的值,并且其系数违反全局单调性条件。所提出的方案基于将 Lamperti 型变换与显式截断方法相结合。新方案产生的数值近似保留了原始 SDE 的域,并被证明保留了一阶均方收敛率。最后报告了数值例子来证实我们的理论发现。
A novel explicit time-stepping scheme, called Lamperti smoothing truncation scheme, is devised in this paper to strongly approximate a stochastic SIS epidemic model, whose solution process takes values in a bounded domain and whose coefficients violate the global monotonicity condition. The proposed scheme is based on combining a Lamperti-type transformation with an explicit truncation method. The new scheme results in numerical approximations preserving the domain of the original SDEs and is proved to retain a mean-square convergence rate of order one. Numerical examples are finally reported to confirm our theoretical findings.
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