Guy Latouche 教授的学术报告(二)

发布时间:2015年09月22日 作者:唐颖   消息来源:科研办    阅读次数:[]

报告时间:9月25日(星期五)下午2:30-4:00        

报告题目:Markovian binary trees in a random environment: extinction criteria        

报告摘要        

Markovian binary trees are a special class of branching processes, for which the individuals have a phase-type lifetime and a phase-type number of offsprings. We show how the Markovian structure is used to derive interesting characteristics. Next, we assume that such branching processes are subject to catastrophes which occur at random epochs and kill random numbers of living individuals. It is well known that the criteria for extinction of such a process is related to the conditional growth rate of the population, given the history of the process of catastrophes, and that it is usually hard to evaluate.        

We give a simple characterization in the case when all individuals have the same probability of surviving a catastrophe, and we determine upper and lower bounds in the case where survival depends on the type of the individual. The upper bound appears to be often much tighter than the lower bound.       



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