arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.00765math.OC
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一类连续时间双病毒模型的分析与控制

Analysis and Control of a Continuous-Time Bi-Virus Model

Ji Liu, Philip E. Pare, Angelia Nedich, Choon Yik Tang, Carolyn L. Beck, Tamer Basar

摘要:

研究了一个分布式连续时间双病毒模型,其中两个竞争病毒在由多组个体组成的网络中传播。通过分析系统的平衡点及其稳定性,刻画了网络的极限行为。具体地,当两种病毒在可能不同的有向感染图上传播时,系统可能具有(1)唯一的平衡,健康状态,其是全局稳定的,这意味着两种病毒最终都将被根除,(2)两个平衡,包括健康状态和主导病毒状态,其几乎是全局稳定的,这意味着一种病毒将遍布整个网络,导致单一病毒流行,而另一种病毒将被根除,或(3)至少三个平衡,包括健康状态和两个主导病毒状态,取决于某些条件对愈合和感染率的影响。当两种病毒在同一个有向感染图上传播时,系统可能存在零个或无穷多个共存的流行病平衡点,这代表两种病毒的扩散。在分散控制技术的背景下,一些非平凡平衡的灵敏度性质进行了研究,并给出了一个不可能的结果,为某种类型的分布反馈控制器。

英文摘要:

This paper studies a distributed continuous-time bi-virus model in which two competing viruses spread over a network consisting of multiple groups of individuals. Limiting behaviors of the network are characterized by analyzing the equilibria of the system and their stability. Specifically, when the two viruses spread over possibly different directed infection graphs, the system may have (1) a unique equilibrium, the healthy state, which is globally stable, implying that both viruses will eventually be eradicated, (2) two equilibria including the healthy state and a dominant virus state, which is almost globally stable, implying that one virus will pervade the entire network causing a single-virus epidemic while the other virus will be eradicated, or (3) at least three equilibria including the healthy state and two dominant virus states, depending on certain conditions on the healing and infection rates. When the two viruses spread over the same directed infection graph, the system may have zero or infinitely many coexisting epidemic equilibria, which represents the pervasion of the two viruses. Sensitivity properties of some nontrivial equilibria are investigated in the context of a decentralized control technique, and an impossibility result is given for a certain type of distributed feedback controller.

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