OIZUMI RYO

オオイズミリョウ | OIZUMI RYO

Affiliation and department：
Job title： Senior Researcher
Homepage URL (1)： http://www.ipss.go.jp/pr-ad/j/soshiki/kozin/oizumi.html

Research field (5)： Applied mathematics and statistics , Basic mathematics , Applied mathematics and statistics , Basic mathematics , Evolutionary biology

Research keywords (5)： Stochastic Differential Equation , Stochastic Control Theory , Stochastic Analysis , Evolution , Population Dynamics

Research theme for competitive and other funds (1)：

2020 - 2024 Theory and Analysis for population decline society by using generalized Leslie matrix

Papers (7)：

Ryo Oizumi, Hisashi Inaba, Takenori Takada, Youichi Enatsu, Kensaku Kinjo. Sensitivity analysis on the declining population in Japan: Effects of prefecture-specific fertility and interregional migration. PLOS ONE. 2022. 17. 9. e0273817-e0273817
Ryo Oizumi, Hisashi Inaba. Evolution of heterogeneity under constant and variable environments. PloS one. 2021. 16. 9. e0257377
Ryo Oizumi, Toshikazu Kuniya, Yoichi Enatsu. Reconsideration of r/K Selection Theory Using Stochastic Control Theory and Nonlinear Structured Population Models. PLOS ONE. 2016. 11. 6. e0157715
Toshikazu Kuniya, Ryo Oizumi. Existence result for an age-structured SIS epidemic model with spatial diffusion. Nonlinear Analysis: Real World Applications. 2015. 23. 196-208
Ryo Oizumi. Unification Theory of Optimal Life Histories and Linear Demographic Models in Internal Stochasticity. PLOS ONE. 2014. 9. 6. e98746

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Books (2)：

Population Dynamics Based on Individual Stochasticity
Springer Singapore 2022 ISBN:9789811935473
ENCYCLOPEDIA OF POPULATION SCIENCE
MARUZEN PUBLISHING 2018 ISBN:9784621303078

Lectures and oral presentations (7)：

Evolution of optimal life history with stochastic growth process in age-size structured model
(GCOE Tutorial Workshop “Biomathematics of Structured Populations” with a Mini-Symposium in Honor of Professor Yasuhiro Takeuchi 2012)
確率変動を伴う最適生活史戦略と個体群動態
(第22回日本数理生物学会年会 2012)
齢-サイズ構造をもつ個体群動態の経路積分による解析
(第21 回日本数理生物学会年会「New theoretical approaches for stochastic phenomena in biology」 2011)
確率変動を含む最適戦略と個体群動態
(日本生態学会第 58 回大会 2011)
The optimal control of growth process under environmental stochasticity
(The Third China-Japan Colloquium of Mathematical Biology 2010)

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Education (3)：

2008 - 2013 Hokkaido University The Graduate school of Environmental Science Division of Environmental Science Development
2006 - 2008 Tokai University The Graduate School of High-Technology for Human Welfare Bioscience and Tecnology
2002 - 2006 Tokai University The School of high-Technology for Human Welfare Bioscience and Tecnology

Professional career (3)：

博士(環境科学) (北海道大学大学院地球環境科学院)
工学修士 (東海大学大学院開発工学研究科)
工学学士 (東海大学開発工学部)

Work history (9)：

2023/04 - 現在 National Institute of Population and Social Security Research Department of International Research and Cooperation Senior Researcher
2018/04 - 2023/03 National Institute of Population Problem and Social Security Research Department of Population Structure Research Senior Researcher
2017/07 - 2018/03 National Institute of Population Problem and Social Security Research Department of Population Structure Research Researcher
2015/07 - 2017/06 Ministry of Health, Labour and Welfare Director General for Policy Planning, Office of Counsellor for Social Security Reseach Officer of Demography
2015/04 - 2015/06 Kogakuin University Part-time Lecturer

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Association Membership(s) (3)：

THE SOCIETY OF POPULATION ECOLOGY , THE POPULATION ASSOCIATION OF JAPAN , THE JAPANESE SOCIETY FOR MATHEMATICAL BIOLOGY

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