带移民的碰撞分枝过程的唯一性

本文提出了一种带移民的碰撞分枝过程,它由三部分组成:马氏分枝过程、碰撞分枝过程和状态独立的移民过程,给出了该过程正则性和唯一性判别准则。     

带移民的马尔可夫分支过程的唯一性

本文考虑了一类带移民的马尔可夫分支过程,给出了这个过程的唯一性和正则性的判定准则。     

随机环境中分枝过程灭绝概率的性质

本文给出了随机环境中分枝过程概率母函数以及灭绝概率的性质.     

随机环境中的受控分枝过程

本文建立了随机环境中受控分枝过程模型．它是更一般意义下的随机环境中的分枝过程，在平稳遍历环境下，研究了其灭绝概率问题，通过对控制函数作适当的假设，利用平稳遗历过程的性质及概率母函数的迭代关系式，得到了判断过程灭绝的一个判定准则．     

随机环境中两性分枝过程的马氏性与灭绝

证明了随机环境中的两性分枝过程是随机环境中马氏链,得到了概率母函数的一些关系,并利用这些关系,针对各种不同的具体的配对函数,给出了过程必然灭绝的一些充分条件.     

随机环境中受控分枝过程的稳定性

本文研究了控制函数独立同分布,并且第n代的繁殖情况取决于环境的随机环境中分枝过程.给出了该模型稳定的充分条件,当环境平稳遍历时,得到了过程几乎处处灭绝的充分条件.     

独立平稳随机环境中的P—S—D分枝过程

本文研究了独立同分布的随机环境中的Ｐ－Ｓ－Ｄ分枝过程,获得了有关过程的渐近性态以及灭 绝概率的一些结果．     

一类临界可交换随机环境中分枝过程的灭绝概率

本文将经典分枝过程临界情形的遍历基本引理推广到了随机环境情形,并在此基础上研究了一类临界可交换随机环境中分枝过程的灭绝概率的性质．     

带拯救的碰撞分枝过程的常返性与遍历性

考虑了一类带有拯救的碰撞分枝过程,给出了过程的正则性与唯一性准则,并得到了常返性和遍历性的充要条件.同时,给出了指数遍历性的一个便于验证的充分条件.     

带拯救的两参数Markov碰撞过程的遍历性

本文考虑了一类带拯救的两参数Markov碰撞过程.首先讨论了带拯救的两参数Markov碰撞q-矩阵发生函数的性质,通过发生函数给出了过程的正则性和唯一性判别准则,得到了过程的常返性和遍历性的充分必要条件,并给出了几个易于验证的充分条件.最后,给出了遍历情形下该过程平稳分布的发生函数,并给出了过程强遍历的判别准则.     

分支碰撞过程的唯一性和吸收性质

本文研究了一种分支碰撞过程，它的唯一性和吸收概率在大多数情况下都是成立的。     

随机环境中受控两性分枝过程的概率性质

本文介绍了一类配对依赖人口数的随机环境中受控两性分枝过程,研究了它的马氏性,对偶律及其概率母函数的性质.     

Analysis of a Recurrence Related to Critical Nonhomogeneous Branching Processes

Abstract

Some classes of controlled branching processes (with nonhomo-geneous migration or with nonhomo-geneous state-dependent immigration) lead in the critical case to a recurrence for the extinction probabilities. Under some additional conditions it is known that this recurrence depends on some parameter β and converges for 0 < β < 1. Now we show that the recurrence does converge for all positive values of the parameter β, which leads to an extension of some limit theorems for the corresponding branching processes. We also give a generalization of the recurrence and an asymptotic analysis of its behavior.     

随机环境中受控分枝过程的灭绝概率

本文给出在平稳遍历随机环境下受控分枝过程增长率的一个上界以及过程灭绝的充分条件.     

Two-Type Branching Processes with Subexponential Life-Spans and SIR Epidemic Models

Abstract

We consider a model of age-dependent branching stochastic process that takes into account the incubation period of the life of individuals. We demonstrate that such processes may be treated as a two-type branching process with a periodic mean matrix. In the case when the Malthusian parameter does not exist study of the process requires additional restrictions on the life and incubation time distributions which define so called subexponential family (Athreya, K. 1972. Branching Processes, Springer, New York). We obtain certain new properties of subexponential distributions, in particular, describe a subclass, which is closed with respect to convolution. Using these results we derive asymptotic behavior of the first and second moments and of the probability of nonextinction. We also prove a limit theorem for the process conditioned on nonextinction.     

Uniqueness and Extinction of Weighted Markov Branching Processes

This paper focuses on discussing some basic properties of the weighted Markov branching process which is a natural generalisation of the ordinary Markov branching process. The regularity and uniqueness criteria, which are very easy to verify, are firstly established. Some important characteristics regarding the hitting times of such structure are obtained. In particular, the closed forms for the mean extinction time and conditional mean extinction time are presented. The explosion behaviour of the process is investigated and then the mean explosion time is derived. The mean global holding time and the mean total survival time are also obtained. AMS 2000 Subject Classification Primary 60 J27; Secondary 60 J80     

非线性利率模型的分枝过程逼近

章主要证明了状态相依的分枝过程序列的一个极限定理, 结果表明非线性利率期限结构模型可以通过状态相依分枝过程的极限方式得到.