arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2406.05058q-bio.PE
收藏

传染病多尺度模型的精确随机模拟算法

Accurate stochastic simulation algorithm for multiscale models of infectious diseases

Yuan Yin, Jennifer A. Flegg, Mark B. Flegg

AI总结:

针对传染病多尺度模型非马尔可夫化带来的计算挑战,本文开发了一种新型精确随机模拟算法,应用于宿主内确定性模型与种群水平随机动力学耦合的系统,在合理分辨率下保持精确且高效,可推广至其他多尺度系统。

摘要:

在传染病文献中,大量工作致力于单尺度动力学研究。例如,描述种群水平动力学的房室模型常以微分方程形式构建。当小数量或噪声起关键作用时,这些微分方程会被无记忆马尔可夫模型取代,其中离散个体可属于某个房室并随机转移。经典随机模拟算法(如下一反应法)可精确求解这些马尔可夫模型。不同尺度模型间的复杂耦合凸显了传染病多尺度建模的重要性,但当多尺度模型变为非马尔可夫时,会出现若干计算挑战。本文通过开发一种新型精确随机模拟算法解决这些挑战,将其应用于一个展示性多尺度系统:所有个体共享相同的确定性宿主内模型,而种群水平动力学由随机公式控制。结果表明,只要以合理分辨率获取宿主内信息,该新型算法始终保持精确,且即使在更精细分辨率下,其实现仍具有高效性。除传染病建模外,该算法还广泛适用于其他多尺度系统,提供了一个通用、精确且计算高效的框架。

英文摘要:

In the infectious disease literature, significant effort has been devoted to studying dynamics at a single scale. For example, compartmental models describing population-level dynamics are often formulated using differential equations. In cases where small numbers or noise play a crucial role, these differential equations are replaced with memoryless Markovian models, where discrete individuals can be members of a compartment and transition stochastically. Classic stochastic simulation algorithms, such as the next reaction method, can be employed to solve these Markovian models exactly. The intricate coupling between models at different scales underscores the importance of multiscale modelling in infectious diseases. However, several computational challenges arise when the multiscale model becomes non-Markovian. In this paper, we address these challenges by developing a novel exact stochastic simulation algorithm. We apply it to a showcase multiscale system where all individuals share the same deterministic within-host model while the population-level dynamics are governed by a stochastic formulation. We demonstrate that as long as the within-host information is harvested at a reasonable resolution, the novel algorithm will always be accurate. Furthermore, our implementation is still efficient even at finer resolutions. Beyond infectious disease modelling, the algorithm is widely applicable to other multiscale systems, providing a versatile, accurate, and computationally efficient framework.

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。

↑