Numerical Solutions to Stochastic Model and Their Applications

A special issue of Mathematical and Computational Applications (ISSN 2297-8747).

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 1902

Special Issue Editors


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Guest Editor
School of Mathematics and Physics, Xi'an Jiaotong-Liverpool University, Suzhou, China
Interests: stochastic process; numerical solutions on stochastic models; model estimation and model selection
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Financial and Actuarial Mathematics, Xi’an Jiaotong-Liverpool University, Suzhou, China
Interests: asymptotic behaviours of Markov process; large deviation principle; moderate deviation principle in statistical physics and population genetics
Department of Financial and Actuarial Mathematics, Xi’an Jiaotong-Liverpool University, Suzhou, China
Interests: risk and ruin theory; stochastic optimal control in insurance and finance; applied stochastic processes; machine learning techniques in actuarial science

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Guest Editor
Department of Actuarial Studies and Business Analytics, Macquarie University, Sydney, Australia
Interests: optimal control in actuarial science; mathematical finance; numerical methods in stochastic systems; machine learning

Special Issue Information

Dear Colleagues,

For decades, stochastic modeling has been widely applied in fields such as economics, finance, insurance, population dynamics, epidemiology, and engineering. The stochastic differential equation (SDE), random algorithm, and stochastic optimal control play central roles in solving various modeling and decision-making problems.  For example,  SDEs provide the essential stochastic modeling device for modern financial theory and sampling algorithms in machine learning. In addition, most of the practical problems in finance and insurance are stochastic optimal control problems, in which optimal decisions (controls) are made based on information from the underlying dynamics over time. Such problems can be tackled with dynamic programming and Hamilton–Jacobi‒Bellman (HJB) equations or backward stochastic differential equations (BSDEs). However, for most of the applications, the underlying dynamics are so complex that the associated (B)SDEs or HJB equations cannot be analytically solved, thus necessitating the use of numerical methods for finding their approximated solutions. In machine learning and statistics, efficient algorithms usually rely heavily on fast sampling schemes, which account for most of the running times. 

This Special Issue is devoted to collect contributions in numerical methods, random algorithms, and solutions of stochastic modeling and their applications. The topics include numerical solutions for various SDEs and BSDEs and their applications in finance and insurance, numerical solutions for stochastic optimal control problems, deep learning and reinforcement learning algorithms for BSDEs, optimal control, optimal stopping problems, etc.

Prof. Dr. Conghua Wen
Dr. Youzhou Zhou
Dr. Ran Xu
Prof. Dr. Zhuo Jin
Guest Editors

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Research

33 pages, 2936 KiB  
Article
Role Reversals in a Tri-Trophic Prey–Predator Interaction System: A Model-Based Study Using Deterministic and Stochastic Approaches
by Sk Golam Mortoja, Ayan Paul, Prabir Panja, Sabyasachi Bhattacharya and Shyamal Kumar Mondal
Math. Comput. Appl. 2024, 29(1), 3; https://doi.org/10.3390/mca29010003 - 10 Jan 2024
Viewed by 1355
Abstract
It is frequently observed that adult members of prey species sometimes use their predation mechanism on juvenile members of predator species. Ecological literature describes this phenomenon as prey–predator role reversal dynamics.Numerous authors have observed and described the biological development behind this feeding behaviour. [...] Read more.
It is frequently observed that adult members of prey species sometimes use their predation mechanism on juvenile members of predator species. Ecological literature describes this phenomenon as prey–predator role reversal dynamics.Numerous authors have observed and described the biological development behind this feeding behaviour. However, the dynamics of this role reversal have hardly been illustrated in the literature in a precise way. In this regard, we formulated an ecological model using the standard prey–predator interactions, allowing for a reverse feeding mechanism. The mathematical model consisted of a three-species food-web structure comprising the common prey, intermediate predator, and top predator. Note that a role-reversal mechanism was observed between the intermediate and top predators based on the scarcity of the prey population. However, we observed the most critical parameters had a significant effect on this reverse feeding behaviour. The bifurcation analysis is the primary criterion for this identification. The proposed deterministic model is then extended to its stochastic analogue by allowing for environmental influences on the tri-trophic food web structure. The conditional moment approach is applied to obtain the equilibrium distribution of populations and their conditional moments in the system. The stochastic setup analysis also supports the stability of this food chain structure, with some restricted conditions. Finally, to facilitate the interpretation of our mathematical results, we investigated it using numerical simulations. Full article
(This article belongs to the Special Issue Numerical Solutions to Stochastic Model and Their Applications)
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