Odaka, Yuji(Graduate School of Science, Division of Mathematics and Mathematical Sciences) | Activity Database on Education and Research, Kyoto University

Odaka, Yuji

Graduate School of Science, Division of Mathematics and Mathematical Sciences Associate Professor

Last Updated :2025/06/20

Basic Information

Faculty

理学部

Academic Degree

Master degree(Kyoto university)

Ph.D(Kyoto university)

Academic Resume (Graduate Schools)

京都大学, 大学院理学研究科修士課程数学・数理解析専攻, 修了

京都大学, 大学院理学研究科博士後期課程数学・数理解析専攻, 修了

Academic Resume (Undergraduate School/Majors)

東京大学, 教養学部理科Ⅰ類, 修了

東京大学, 理学部数学科, 退学

High School

High School
筑波大学附属駒場高等学校

ID,URL

J-Global ID
201401070673275083
External link
https://sites.google.com/view/yodaka-math

researchmap URL

https://researchmap.jp/7000009334

Last Updated :2025/06/20

Research

Research Interests

Moduli spaces, (K-)Stability, Canonical Kahler metrics etc.

Research Areas

Natural sciences, Algebra, Algebraic Geometry

Papers

Fano Shimura varieties with mostly branched cusps
Yota Maeda; Yuji Odaka
Birational Geometry, Kähler–Einstein Metrics and Degenerations: Moscow, Shanghai and Pohang, June–November 2019 (Springer Proceedings in Mathematics & Statistics, 409), Dec. 2022, Peer-reviewed, Invited

Degenerated Calabi–Yau varieties with infinite components, moduli compactifications, and limit toroidal structures
Yuji Odaka
European Journal of Mathematics, Aug. 2022, Peer-reviewed, Invited

Polystable Log Calabi-Yau Varieties and Gravitational Instantons
Yuji Odaka
J. Math. Sci. Univ. Tokyo, 2022, Peer-reviewed

Tropical Geometric Compactification of Moduli, I – Mg Case
Yuji Odaka
Moduli of K-stable varieties, Jun. 2019, Peer-reviewed, Invited

Canonical Kähler metrics and arithmetics: Generalizing Faltings heights
Yuji Odaka
Kyoto Journal of Mathematics, 01 Jun. 2018

PL density invariant for type II degenerating K3 surfaces, Moduli compactification and hyperKahler metrics
Yuji Odaka
Nagoya Math Journal, Nov. 2021, Peer-reviewed, Lead author

Collapsing K3 surfaces and Moduli compactification
Yuji Odaka; Yoshiki Oshima
Proc. Japan Acad. Ser. A Math. Sci., Nov. 2018, Peer-reviewed

Tropical Geometric Compactification of Moduli, II: Ag case and holomorphic limits.
Yuji Odaka
IMRN, Mar. 2018, Peer-reviewed

On the K-stability of Fano varieties and anticanonical divisors
Yuji Odaka
Tohoku Math. J., 2018, Peer-reviewed

COMPACT MODULI SPACES OF DEL PEZZO SURFACES AND KAHLER-EINSTEIN METRICS
Yuji Odaka; Cristiano Spotti; Song Sun
JOURNAL OF DIFFERENTIAL GEOMETRY, Jan. 2016, Peer-reviewed

Compact Moduli Spaces of Kahler-Einstein Fano Varieties
Yuji Odaka
PUBLICATIONS OF THE RESEARCH INSTITUTE FOR MATHEMATICAL SCIENCES, Sep. 2015, Peer-reviewed
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Invariants of varieties and singularities inspired by Kahler-Einstein problems
Yuji Odaka
PROCEEDINGS OF THE JAPAN ACADEMY SERIES A-MATHEMATICAL SCIENCES, Apr. 2015, Peer-reviewed

Testing log K-stability by blowing up formalism
Yuji Odaka; Song Sun
Ann. Fac. Sci. Toulouse Math., 2015, Peer-reviewed

ON PARAMETRIZATION, OPTIMIZATION AND TRIVIALITY OF TEST CONFIGURATIONS
Yuji Odaka
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, Jan. 2015, Peer-reviewed

Birational superrigidity and slope stability of Fano manifolds
Yuji Odaka; Takuzo Okada
MATHEMATISCHE ZEITSCHRIFT, Dec. 2013, Peer-reviewed

A GENERALIZATION OF THE ROSS-THOMAS SLOPE THEORY
Yuji Odaka
OSAKA JOURNAL OF MATHEMATICS, Mar. 2013, Peer-reviewed

The GIT stability of polarized varieties via discrepancy
Yuji Odaka
ANNALS OF MATHEMATICS, Mar. 2013, Peer-reviewed
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Alpha invariant and K-stability of Q-Fano varieties
Yuji Odaka; Yuji Sano
ADVANCES IN MATHEMATICS, Mar. 2012, Peer-reviewed
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LOG-CANONICAL MODELS OF SINGULAR PAIRS AND ITS APPLICATIONS
Yuji Odaka; Chenyang Xu
MATHEMATICAL RESEARCH LETTERS, 2012, Peer-reviewed
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The Calabi Conjecture and K-stability
Yuji Odaka
INTERNATIONAL MATHEMATICS RESEARCH NOTICES, 2012, Peer-reviewed

Presentations

"Why K-stability of Fano manifolds important? - Introduction with prospective problems - "
Yuji Odaka
On recent progress on Fano manifolds, 2013

On the recent developments on algebro-geometric compactifications of Moduli of K3 surfaces --- especially after Alexeev-Engel
Yuji Odaka
Kinosaki algebraic geometry symposium, 2021, Invited

On the moduli of Kähler-Einstein Fano manifolds
Yuji Odaka
Kinosaki algebraic geometry symposium, 2013, Invited

On the GIT stability of polarized varieties
Yuji Odaka
Kinosaki algebraic geometry symposium, 2010, Invited

Calabi-Yau/K ̈ahler-Einstein metrics, Collapsing K3 surfaces and Generalized Faltings heights
Yuji Odaka
Arithmetic algebraic geometry and mathematical physics - in honor of Prof Moriwaki's 60th birthday, 29 Nov. 2021, Invited

Tropical geometric compactification of moduli of surfaces
Yuji Odaka
Algebraic Geometry and Moduli Theory - Conference in Honor of Shigeru Mukai’s Retirement, Mar. 2019, Invited

Visualizing Mori theory somewhat?
Yuji Odaka
Higher dimensional algebraic geometry and around, Kobe-Kyoto, In honour of retirement of Prof. Shigefumi Mori, Feb. 2016, Invited

Gromov-Hausdorff compactifications of Moduli of Kahler- Einstein manifolds
Yuji Odaka
Pacific Rim Complex Geometry ICM 2014 Satellite conference, 2014, Invited

Tropical Geometri Compactification of Moduli
Yuji Odaka
Second Japanese-European Symposium on Symplectic Varieties and Moduli Spaces, 19 Sep. 2017, Invited

Tropical Geometric Compactification of Moduli
Yuji Odaka
Trends in Modern Geometry, 10 Jul. 2017, Invited

Two non-complex viewpoints on Kahler-Einstein geometry
Yuji Odaka
Complex geometry 2016, Nov. 2016, Invited

On compactifying the moduli spaces of Kahler-Einstein varieties
Yuji Odaka
Algebraic Geometry: Old and New (Oxford university, Clay Math Institute), 27 Sep. 2016, Invited

Books and Other Publications

Collapsing K3 surfaces, tropical geometry and moduli compactifications of Satake, Morgan-Shalen type
Odaka, Yuji; Oshima, Yoshiki, Joint work
Mathematical Society of Japan, 2021
Find Kyoto University's collection of books :

Awards

18 Mar. 2019
The Mathematical Society of Japan, Geometry Prize

17 Mar. 2020
Mathematical Society of Japan, Spring prize

17 Dec. 2020
JSPS, JSPS prize

External funds: Kakenhi

Symplectic algebraic geometry and moduli spaces
Grant-in-Aid for Scientific Research (A)
Medium-sized Section 11:Algebra, geometry, and related fields
Kyoto University
並河良典
From 05 Apr. 2021, To 31 Mar. 2026, Granted
シンプレクティック代数幾何;超ケーラー多様体;モジュライ空間;シンプレクティック特異点;ポアソン変形;複素シンプレクティック多様体;双有理幾何;トーリック超ケーラー多様体;べき零軌道;小林-ヒッチン対応
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21H04429/

The arithmetic and moduli of hyper-Kaehler varieties via non-archimedean methods
Grant-in-Aid for Scientific Research (B)
Basic Section 11010:Algebra-related
Kyoto University
伊藤哲史
From 01 Apr. 2021, To 31 Mar. 2026, Granted
非アルキメデス幾何;超ケーラー多様体;モジュライ
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21H00973/

格子、保型形式とK3曲面、エンリケス曲面の研究
Grant-in-Aid for Scientific Research (A)
Medium-sized Section 11:Algebra, geometry, and related fields
Nagoya University
金銅誠之
From 01 Apr. 2020, To 31 Mar. 2025, Granted
K3曲面;Enriques曲面;モジュライ空間;保型形式;自己同型群;Kummer曲面;コンパクト化;混合ホッジ構造;実直線配置;有界対称領域;エンリケス曲面;格子理論;モジュラー形式;格子;特異点;Coble曲面;自己同型;モジュライ;小平次元;商特異点
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20H00112/

Canonical Kahler metrics and Moduli spaces
Grant-in-Aid for Early-Career Scientists
Basic Section 11010:Algebra-related
Kyoto University
Yuji Odaka
From 01 Apr. 2018, To 31 Mar. 2023, Project Closed
モジュライ空間;K3曲面;コンパクト化;Ricci-平坦計量;K安定性;トロピカル幾何学;非アルキメデス幾何学;局所対称空間;moduli空間;Arakelov幾何学;Berkovich幾何学;志村多様体;退化;保形形式;モジュライ;密度関数;重力インスタントン;Gromov-Hausdorff崩壊;標準ケーラー計量;安定性;アラケロフ幾何学
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18K13389/

New development of algebraic geometry viewed from theoretical physics
Grant-in-Aid for Scientific Research (S)
Kyoto University
Atsushi Moriwaki
From 31 May 2016, To 31 Mar. 2021, Project Closed
代数幾何学;数理物理学;アラケロフ幾何学;シンプレクティック特異点;解析的捩率;カラビ・ヤウ多様体;超ケーラー多様体;量子コホモロジー;微分幾何学;複素幾何学;ゲージ理論;数論多様体;シンプレクティック多様体;代数多様体;シンプレティック多様体;数理物理;代数学;幾何学;モジュライ空間;数論幾何学;理論物理学;表現論
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16H06335/

K-stability, degeneration of algebraic varieties
Grant-in-Aid for Young Scientists (B)
Kyoto University
Yuji Odaka
From 01 Apr. 2014, To 31 Mar. 2017, Project Closed
モジュライ空間;安定性;標準Kahler計量;トロピカル幾何;モジュライ;Fallings高さ;K-energy;Arakelov幾何;K安定性;双有理幾何学;ファノ多様体;反標準因子;トロピカル幾何学;ミラー対称性;非アルキメデス幾何;Donaldson-二木不変量;Kahler-Einstein計量
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26870316/

代数多様体のK安定性理論とArakelov幾何学
Grant-in-Aid for Scientific Research (B)
Basic Section 11010:Algebra-related
Kyoto University
尾高悠志
From 01 Apr. 2023, To 31 Mar. 2028, Granted
モジュライ空間;アラケロフ幾何学;K安定性
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23H01069/

代数多様体のK安定性と標準Kahler計量の極限挙動
Fund for the Promotion of Joint International Research (Fostering Joint International Research)
Basic Section 11010:Algebra-related
Kyoto University
尾高悠志
From 01 Apr. 2024, To 31 Mar. 2027, Granted
標準Kahler計量;K安定性;非アルキメデス解析幾何学;特異点;モジュライ理論
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23KK0249/

代数多様体のK安定性理論とArakelov幾何学
Grant-in-Aid for Scientific Research (B)
Basic Section 11010:Algebra-related
Kyoto University
尾高悠志
From 01 Apr. 2023, To 31 Mar. 2028, Granted
Arakelov幾何学;K安定性;標準計量;志村多様体;コンパクト化;モジュライ空間;アラケロフ幾何学
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23K25766/

The arithmetic and moduli of hyper-Kaehler varieties via non-archimedean methods
Grant-in-Aid for Scientific Research (B)
Basic Section 11010:Algebra-related
Kyoto University
伊藤哲史
From 01 Apr. 2021, To 31 Mar. 2026, Granted
非アルキメデス幾何;超ケーラー多様体;モジュライ
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23K20786/

Geometry of curvature and moduli
Grant-in-Aid for Scientific Research (A)
Medium-sized Section 11:Algebra, geometry, and related fields
The University of Tokyo
本多正平
From 01 Apr. 2025, To 31 Mar. 2030, Granted
リッチ曲率;スカラー曲率;モジュライ;グロモフ・ハウスドルフ収束
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25H00586/

Last Updated :2025/06/20

Education

Teaching subject(s)

From 01 Apr. 2025, To 31 Mar. 2026
Topics in Algebra C
0269, Fall, Graduate School of Science, 2

From 01 Apr. 2025, To 31 Mar. 2026
Introduction to Algebra
2102, Fall, Faculty of Science, 2

From 01 Apr. 2025, To 31 Mar. 2026
Exercises in Basic Algebra
2103, Fall, Faculty of Science, 2

From 01 Apr. 2025, To 31 Mar. 2026
Advanced Algebra I
4100, Fall, Faculty of Science, 2

From 01 Apr. 2025, To 31 Mar. 2026
Seminar on Algebraic Geometry D
0531, Fall, Graduate School of Science, 3

From 01 Apr. 2025, To 31 Mar. 2026
Seminar on Algebraic Geometry C
0530, Spring, Graduate School of Science, 3

From 01 Apr. 2025, To 31 Mar. 2026
Seminar on Algebraic Geometry B
0529, Fall, Graduate School of Science, 3

From 01 Apr. 2025, To 31 Mar. 2026
Seminar on Algebraic Geometry A
0528, Spring, Graduate School of Science, 3

From 01 Apr. 2025, To 31 Mar. 2026
Linear Algebra with Exercises A
N151, Spring, Institute for Liberal Arts and Sciences, 3

From 01 Apr. 2024, To 31 Mar. 2025
Seminar on Algebraic Geometry B
0529, Fall, Graduate School of Science, 3

From 01 Apr. 2024, To 31 Mar. 2025
Seminar on Algebraic Geometry A
0528, Spring, Graduate School of Science, 3

From 01 Apr. 2024, To 31 Mar. 2025
Seminar on Algebraic Geometry C
0530, Spring, Graduate School of Science, 3

From 01 Apr. 2024, To 31 Mar. 2025
Seminar on Algebraic Geometry D
0531, Fall, Graduate School of Science, 3

From 01 Apr. 2023, To 31 Mar. 2024
Special study course (Mathematical Science)
5140, Year-long, Faculty of Science, 12

From 01 Apr. 2023, To 31 Mar. 2024
Advanced Algebra I
4100, Fall, Faculty of Science, 2

From 01 Apr. 2023, To 31 Mar. 2024
Seminar on Algebraic Geometry D
0531, Fall, Graduate School of Science, 3

From 01 Apr. 2023, To 31 Mar. 2024
Seminar on Algebraic Geometry C
0530, Spring, Graduate School of Science, 3

From 01 Apr. 2023, To 31 Mar. 2024
Linear Algebra with Exercises B
N152, Fall, Institute for Liberal Arts and Sciences, 3

From 01 Apr. 2023, To 31 Mar. 2024
Topics in Algebra C
0269, Fall, Graduate School of Science, 2

From 01 Apr. 2023, To 31 Mar. 2024
Algebra I
3100, Spring, Faculty of Science, 4

From 01 Apr. 2022, To 31 Mar. 2023
Seminar on Algebraic Geometry B
0529, Fall, Graduate School of Science, 3

From 01 Apr. 2022, To 31 Mar. 2023
Linear Algebra with Exercises A
N151, Spring, Institute for Liberal Arts and Sciences, 3

From 01 Apr. 2022, To 31 Mar. 2023
Advanced Algebra I
4100, Fall, Faculty of Science, 2

From 01 Apr. 2022, To 31 Mar. 2023
Seminar on Algebraic Geometry d
0433, Fall, Graduate School of Science, 3

From 01 Apr. 2022, To 31 Mar. 2023
Topics in Algebra A
0267, Fall, Graduate School of Science, 2

From 01 Apr. 2022, To 31 Mar. 2023
Algebra I
3100, Spring, Faculty of Science, 4

From 01 Apr. 2022, To 31 Mar. 2023
Seminar on Algebraic Geometry A
0528, Spring, Graduate School of Science, 3

From 01 Apr. 2022, To 31 Mar. 2023
Seminar on Algebraic Geometry c
0432, Spring, Graduate School of Science, 3

From 01 Apr. 2022, To 31 Mar. 2023
Seminar on Algebraic Geometry a
0430, Spring, Graduate School of Science, 3

From 01 Apr. 2022, To 31 Mar. 2023
Seminar on Algebraic Geometry b
0431, Fall, Graduate School of Science, 3

From Apr. 2014, To Mar. 2015
Exercises in Algebra II
Fall, 理学部

From Apr. 2014, To Mar. 2015
Algebraic Geometry
Spring, 理学部

From Apr. 2014, To Mar. 2015
Algebraic Geometry
Spring, 理学研究科

From Apr. 2015, To Mar. 2016
Exercises in Algebra I
Spring, 理学部

From Apr. 2015, To Mar. 2016
Advanced Algebra I
Fall, 理学部

From Apr. 2015, To Mar. 2016
Topics in Algebra D
Fall, 理学研究科

From Apr. 2016, To Mar. 2017
Seminar on Algebraic Geometry A
Spring, 理学研究科

From Apr. 2016, To Mar. 2017
Seminar on Algebraic Geometry B
Fall, 理学研究科

From Apr. 2016, To Mar. 2017
Seminar on Algebraic Geometry C
Spring, 理学研究科

From Apr. 2016, To Mar. 2017
Seminar on Algebraic Geometry D
Fall, 理学研究科

From Apr. 2016, To Mar. 2017
Basic Mathematics B
Fall, 全学共通科目

From Apr. 2017, To Mar. 2018
Advanced Algebra I
Fall, 理学部

From Apr. 2017, To Mar. 2018
Topics in Algebra D
Fall, 理学研究科

From Apr. 2017, To Mar. 2018
Seminar on Algebraic Geometry A
Spring, 理学研究科

From Apr. 2017, To Mar. 2018
Seminar on Algebraic Geometry B
Fall, 理学研究科

From Apr. 2017, To Mar. 2018
Seminar on Algebraic Geometry C
Spring, 理学研究科

From Apr. 2017, To Mar. 2018
Seminar on Algebraic Geometry D
Fall, 理学研究科

From Apr. 2017, To Mar. 2018
Mathematics seminary
Year-long, 理学部

From Apr. 2017, To Mar. 2018
Linear Algebra with Exercises A
Spring, 全学共通科目

From Apr. 2017, To Mar. 2018
Linear Algebra with Exercises B
Fall, 全学共通科目

From Apr. 2018, To Mar. 2019
Introduction to Algebra
Fall, 理学部

From Apr. 2018, To Mar. 2019
Exercises in Basic Algebra
Fall, 理学部

From Apr. 2018, To Mar. 2019
Algebraic Geometry
Spring, 理学部

From Apr. 2018, To Mar. 2019
Graduate Lecture in Algebraic Geometry
Spring, 理学研究科

From Apr. 2018, To Mar. 2019
Calculus with Exercises A
Spring, 全学共通科目

From Apr. 2018, To Mar. 2019
Calculus with Exercises B
Fall, 全学共通科目

From Apr. 2018, To Mar. 2019
Seminar on Algebraic Geometry a
Spring, 理学研究科

From Apr. 2018, To Mar. 2019
Seminar on Algebraic Geometry b
Fall, 理学研究科

From Apr. 2018, To Mar. 2019
Seminar on Algebraic Geometry c
Spring, 理学研究科

From Apr. 2018, To Mar. 2019
Seminar on Algebraic Geometry d
Fall, 理学研究科

From Apr. 2018, To Mar. 2019
Linear Algebra with Exercises A
Spring, 全学共通科目

From Apr. 2018, To Mar. 2019
Linear Algebra with Exercises B
Fall, 全学共通科目

From Apr. 2019, To Mar. 2020
Introduction to Algebra
Fall, 理学部

From Apr. 2019, To Mar. 2020
Exercises in Basic Algebra
Fall, 理学部

From Apr. 2019, To Mar. 2020
Algebraic Geometry
Spring, 理学部

From Apr. 2019, To Mar. 2020
Graduate Lecture in Algebraic Geometry
Spring, 理学研究科

From Apr. 2019, To Mar. 2020
Seminar on Algebraic Geometry a
Spring, 理学研究科

From Apr. 2019, To Mar. 2020
Seminar on Algebraic Geometry b
Fall, 理学研究科

From Apr. 2019, To Mar. 2020
Seminar on Algebraic Geometry c
Spring, 理学研究科

From Apr. 2019, To Mar. 2020
Seminar on Algebraic Geometry d
Fall, 理学研究科

From Apr. 2019, To Mar. 2020
Mathematics seminary
Year-long, 理学部

From Apr. 2020, To Mar. 2021
Introduction to Algebra
Fall, 理学部

From Apr. 2020, To Mar. 2021
Exercises in Basic Algebra
Fall, 理学部

From Apr. 2020, To Mar. 2021
Advanced Algebra I
Fall, 理学部

From Apr. 2020, To Mar. 2021
Topics in Algebra A
Fall, 理学研究科

From Apr. 2020, To Mar. 2021
Seminar on Algebraic Geometry a
Spring, 理学研究科

From Apr. 2020, To Mar. 2021
Seminar on Algebraic Geometry b
Fall, 理学研究科

From Apr. 2020, To Mar. 2021
Seminar on Algebraic Geometry c
Spring, 理学研究科

From Apr. 2020, To Mar. 2021
Seminar on Algebraic Geometry d
Fall, 理学研究科

From Apr. 2021, To Mar. 2022
Introduction to Algebra
Fall, 理学部

From Apr. 2021, To Mar. 2022
Exercises in Basic Algebra
Fall, 理学部

From Apr. 2021, To Mar. 2022
Seminar on Algebraic Geometry a
Spring, 理学研究科

From Apr. 2021, To Mar. 2022
Seminar on Algebraic Geometry b
Fall, 理学研究科

From Apr. 2021, To Mar. 2022
Seminar on Algebraic Geometry c
Spring, 理学研究科

From Apr. 2021, To Mar. 2022
Seminar on Algebraic Geometry d
Fall, 理学研究科

From Apr. 2021, To Mar. 2022
Linear Algebra with Exercises A
Spring, 全学共通科目

Participation in PhD Defense

Minimizing CM degree and specially K-stable varieties
HATTORI MASAFUMI, Graduate School of Science, Chief Examiner
23 May 2024

On Affine Structures Which Come from Berkovich Geometry for K-trivial Finite Quotients of Abelian Varieties
GOTO KEITA, Graduate School of Science, Chief Examiner
23 Mar. 2023

Part-time lecturer

From 01 Oct. 2025, To 31 Mar. 2026
東京大学, 大学院数理科学研究科

Last Updated :2025/06/20

Administration

Faculty management (title, position)

From 01 Apr. 2023, To 31 Mar. 2024
理学部・教育委員会委員

From 01 Apr. 2018, To 31 Mar. 2019
理学研究科国際・社会交流・広報委員会委員

From 01 Apr. 2018, To 31 Mar. 2019
理学研究科国際・社会交流・広報委員会　社会交流小委員会委員

From 01 Apr. 2018, To 31 Mar. 2019
理学研究科国際・社会交流・広報委員会　社会交流小委員会　opencampusワーキンググループ

From 01 Apr. 2018, To 31 Mar. 2019
理学研究科国際・社会交流・広報委員会　社会交流小委員会　玉城・サイエンス倶楽部ワーキンググループ長

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