Application of the Diffusion Approximation of Semi-Markov Random Evolutions to Stochastic Systems in Random Media

1995 ◽  
pp. 265-276
Author(s):  
V. Korolyuk ◽  
A. Swishchuk
Keyword(s):  
Diffusion Approximation ◽  
Random Media ◽  
Stochastic Systems ◽  
Markov Random ◽  
Random Evolutions

scholarly journals Discrete-Time Semi-Markov Random Evolutions in Asymptotic Reduced Random Media with Applications

Mathematics ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 963
Author(s):  
Nikolaos Limnios ◽  
Anatoliy Swishchuk
Keyword(s):  
Discrete Time ◽  
Diffusion Approximation ◽  
Random Media ◽  
Asymptotic Approximations ◽  
Asymptotic Results ◽  
Additive Functionals ◽  
Markov Random ◽  
Random Evolutions ◽  
Convergence Method ◽  
Weak Convergence Method

This paper deals with discrete-time semi-Markov random evolutions (DTSMRE) in reduced random media. The reduction can be done for ergodic and non ergodic media. Asymptotic approximations of random evolutions living in reducible random media (random environment) are obtained. Namely, averaging, diffusion approximation and normal deviation or diffusion approximation with equilibrium by martingale weak convergence method are obtained. Applications of the above results to the additive functionals and dynamical systems in discrete-time produce the above tree types of asymptotic results.

scholarly journals Controlled Discrete-Time Semi-Markov Random Evolutions and Their Applications

Mathematics ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 158
Author(s):  
Anatoliy Swishchuk ◽  
Nikolaos Limnios
Keyword(s):  
Dynamical Systems ◽  
Discrete Time ◽  
Diffusion Approximation ◽  
Limit Theorems ◽  
Stochastic Systems ◽  
Renewal Processes ◽  
Additive Functionals ◽  
Markov Random ◽  
Markov Renewal Processes ◽  
Random Evolutions

In this paper, we introduced controlled discrete-time semi-Markov random evolutions. These processes are random evolutions of discrete-time semi-Markov processes where we consider a control. applied to the values of random evolution. The main results concern time-rescaled weak convergence limit theorems in a Banach space of the above stochastic systems as averaging and diffusion approximation. The applications are given to the controlled additive functionals, controlled geometric Markov renewal processes, and controlled dynamical systems. We provide dynamical principles for discrete-time dynamical systems such as controlled additive functionals and controlled geometric Markov renewal processes. We also produce dynamic programming equations (Hamilton–Jacobi–Bellman equations) for the limiting processes in diffusion approximation such as controlled additive functionals, controlled geometric Markov renewal processes and controlled dynamical systems. As an example, we consider the solution of portfolio optimization problem by Merton for the limiting controlled geometric Markov renewal processes in diffusion approximation scheme. The rates of convergence in the limit theorems are also presented.

scholarly journals Discrete-Time Semi-Markov Random Evolutions and their Applications

2013 ◽  
Vol 45 (1) ◽  
pp. 214-240 ◽  
Author(s):  
Nikolaos Limnios ◽  
Anatoliy Swishchuk
Keyword(s):  
Discrete Time ◽  
Diffusion Approximation ◽  
Asymptotic Properties ◽  
Rates Of Convergence ◽  
Bellman Equations ◽  
Additive Functionals ◽  
Markov Random ◽  
Random Evolutions ◽  
Convergence Method ◽  
Hamilton Jacobi Bellman

In this paper we introduce discrete-time semi-Markov random evolutions (DTSMREs) and study asymptotic properties, namely, averaging, diffusion approximation, and diffusion approximation with equilibrium by the martingale weak convergence method. The controlled DTSMREs are introduced and Hamilton–Jacobi–Bellman equations are derived for them. The applications here concern the additive functionals (AFs), geometric Markov renewal chains (GMRCs), and dynamical systems (DSs) in discrete time. The rates of convergence in the limit theorems for DTSMREs and AFs, GMRCs, and DSs are also presented.

scholarly journals Discrete-Time Semi-Markov Random Evolutions and their Applications

2013 ◽  
Vol 45 (01) ◽  
pp. 214-240 ◽  
Author(s):  
Nikolaos Limnios ◽  
Anatoliy Swishchuk
Keyword(s):  
Discrete Time ◽  
Diffusion Approximation ◽  
Asymptotic Properties ◽  
Rates Of Convergence ◽  
Bellman Equations ◽  
Additive Functionals ◽  
Markov Random ◽  
Random Evolutions ◽  
Convergence Method ◽  
Hamilton Jacobi Bellman

In this paper we introduce discrete-time semi-Markov random evolutions (DTSMREs) and study asymptotic properties, namely, averaging, diffusion approximation, and diffusion approximation with equilibrium by the martingale weak convergence method. The controlled DTSMREs are introduced and Hamilton–Jacobi–Bellman equations are derived for them. The applications here concern the additive functionals (AFs), geometric Markov renewal chains (GMRCs), and dynamical systems (DSs) in discrete time. The rates of convergence in the limit theorems for DTSMREs and AFs, GMRCs, and DSs are also presented.

A central limit theorem for nonhomogeneous semi-Markov random evolutions

1989 ◽  
Vol 41 (8) ◽  
pp. 912-918
Author(s):  
V. S. Korolyuk ◽  
A. V. Svishchuk
Keyword(s):  
Central Limit Theorem ◽  
Limit Theorem ◽  
Central Limit ◽  
Markov Random ◽  
Random Evolutions

Limiting representation of continuous semi-Markov random evolutions in the series scheme

1989 ◽  
Vol 41 (11) ◽  
pp. 1267-1274 ◽  
Author(s):  
V. S. Korolyuk ◽  
A. V. Svishchuk
Keyword(s):  
Markov Random ◽  
Series Scheme ◽  
Random Evolutions
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