Faculty Profiles - TOKITA Keiichiro

Papers - TOKITA Keiichiro

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タンパク質デザインの統計力学 Invited Reviewed

高橋智栄，千見寺浄慈，時田恵一郎

日本物理学会誌 Vol. 80 ( 3 ) page： 116 - 120 2025.3

Theoretical analysis of dopamine chemical reaction network and effects of tyrosine hydroxylase using structural sensitivity analysis Reviewed

Shun Sawada, Kei Tokita

Proceedings of the International Conference on AROB-ISBC-SWARM 2024 2024.1

Protein Design based on A Novel Hypothesis of Protein Evolution Reviewed

Tomoei Takahashi, George Chikenji and Kei Tokita

Proceedings of the Joint Symposium of AROB-ISBC-SWARM 2023 page： 1343 - 1348 2023.1

May’s dream: the interactions in biological networks were random matrices after all Reviewed

Kei Tokita

Proceedings of the Joint Symposium of AROB-ISBC-SWARM 2023 page： 1398 - 1401 2023.1

The cavity method to protein design problem Reviewed

Tomoei Takahashi, George Chikenji, Kei Tokita

Journal of Statistical Mechanics: Theory and Experiment Vol. 2022 page： 103403-1 - 103403-14 2022.10

ベイズ学習による格子タンパク質模型のデザイン Invited Reviewed

高橋智栄，千見寺浄慈，時田恵一郎

日本シミュレーション学会誌「シミュレーション」 Vol. 41 ( 3 ) page： 158 - 163 2022.9

Lattice protein design using Bayesian learning Reviewed

Tomoei Takahashi George Chikenji Kei Tokita

Physical Review E ( 104 ) page： 014404 2021.7

複雑系科学にノーベル賞！

時田恵一郎

名古屋大学情報学研究科年報 Informatica Vol. 2 page： 85 - 90 2021

A Traffic Jam Model of Biological Evolution and Species Abundance Distribution Reviewed

Kei Tokita, Jun Sato

Proceedings of the 26th Symposium on Traffic Flow and Self-Driven Particles ( 26 ) page： 1 - 4 2020.12

Analysis of mathematical model of gut flora and its interaction matrix

Yuma TAGUCHI,Kei TOKITA

RIMS Kokyuroku ( 2166 ) page： 72 - 76 2020.7

Population dynamics of ant-aphid system -Switching effect between mutualism and predation

Atsuki NAKAI,Kei TOKITA

RIMS Kokyuroku ( 2166 ) page： 54 - 58 2020.7

Creation of polymorphism caused by predation and cost in a mutualistic nonlinear evolutionary dynamical system

Nakai Atsuki, Inui Yoko, Tokita Kei

Meeting Abstracts of the Physical Society of Japan Vol. 75.1 ( 0 ) page： 2805 - 2805 2020

数理生物学・複雑系科学の視点から

時田恵一郎

名古屋大学情報学研究科年報 Informatica Vol. 1 page： 2 - 5 2020

Detection of Social Bots: Quantification of Language Independent Features and Bot Clusters

Masaki SUGIMORI,Kazutoshi Sasahara,Kei Tokita

Proceedings of the 32nd Annual Conference of the Japanese Society for Artificial Intelligence, 2018 page： 1P2-05-1 - 1P2-05-4 2018.6

Relative species abundance of replicator dynamics with sparse interactions Reviewed

Tomoyuki Obuchi, Yoshiyuki Kabashima and Kei Tokita

Journal of Statistical Mechanics page： 113502 2016.11

Multiple peaks of species abundance distributions induced by sparse interactions Reviewed

Tomoyuki Obuchi, Yoshiyuki Kabashima and Kei Tokita

Physical Review E Vol. 94 page： 022312 2016.8

Dynamic stability and chaotic multispecies-coexistence in a food web mode Invited Reviewed

Kei Tokita

Advances in Science, Technology and Environmentology (ASTE, Waseda University) page： 000 2015.2

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

The relationship between stability and complexity of an ecosystem has been one of the main issues in community
ecology. In such ecosystems, a food web is one of the most complex biological networks in nature, and has been
focused on by field and theoretical ecologists. We consider a food web model represented by the Lotka-Volterra equation
with hierarchically ordered random interspecies interactions, and show that the model has a class of dynamic stability,
and that an arbitrary number of species can coexist in it.

Properties of ecosystems those are vulnerable during eco-fusion Reviewed

Katsuhiko Yoshida, Kei Tokita

Scientific Reports Vol. 5 page： 7939 2015.1

Language：English Publishing type：Research paper (scientific journal)

When two ecosystems with separate evolutionary histories come into contact (eco-fusion), reciprocal invasions occur during their fusion. Asymmetries in the migration direction or extinction rate then occur (e.g., during the Great American Biotic Interchange, GABI). Hypotheses have been proposed to describe this process, but the ecosystem properties have not been adequately discussed. To identify the ecosystem properties that create vulnerability to species loss during eco-fusion, we conducted computer simulations of the fusion of ecosystems with independent evolutionary histories. With asymmetrical species extinction rates, the ecosystem with a higher extinction rate had a shorter food chain, a higher ratio of animal species to plant species, and a lower ratio of carnivores to herbivores. Most ecosystems that have undergone isolated evolution are vulnerable. These results may explain the vulnerability of South America's ecosystem during the GABI and that of modern Australia.

DOI： 10.1038/srep07939

Analytical theory of species abundance distributions of a random community model Invited Reviewed

Kei Tokita

Population Ecology Vol. 57 ( 1 ) 2015.1

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

We review the history and recent progress of the analytical theories of a random community models. In particular, we focus on a global stability analysis of replicator equations with random interactions and species abundance distributions based on statistical mechanics.

DOI： 10.1007/s10144-014-0476-8

GPGPU simulations of 2D lattice neutral models in ecology Reviewed

Takeshi Oura and Kei Tokita

Journal of Physics: Conference Series Vol. 454 page： 012038 (7pages) 2013

Species-area relationship for power-law species abundance distribution Reviewed

Haruyuki Irie and Kei Tokita

International Journal of Biomathematics Vol. 5 page： 1260024 (9 pages) 2012.5

Rank abundance relations in evolutionary dynamics of random replicators Reviewed

Physical Review E Vol. 78 page： 031924 (11 pages) 2008.9

Statistical mechanics and stability of a model eco-system Reviewed

Yoshimi Yoshino, Tobias Galla and Kei Tokita

Journal of Statistical Mechanics page： P09003 (24 pages) 2007.9

Statistical mechanics of relative species abundance Invited Reviewed

Kei Tokita

Ecological Informatics Vol. 1 page： 315-324 2006.11

Species abundance patterns in complex evolutionary dynamics Reviewed

Kei Tokita

Physical Review Letters Vol. 93 page： 178102 (4 pages) 2004.10

Emergence of a complex and stable network in a model ecosystem with extinction and mutation Reviewed

Kei Tokita and Ayumu Yasutomi

Theoretical Population Biology Vol. 63 page： 131-146 2003

Large-Dimensional Replicator Equations with Antisymmetric Random Interactions Reviewed

Tsuyoshi Chawanya and Kei Tokita

Journal of Physical Society of Japan Vol. 71 ( 2 ) page： 429-431 2002

Dynamical Equation Approach to Protein Design Reviewed

Kei Tokita, Macoto Kikuchi and Yukito Iba

Progress of Theoretical Physics Supplement Vol. 138 page： 378-383 2000

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Papers - TOKITA Keiichiro