2023  Dec.  (3 days) 
Yufuin Workshop on Algebraic Geometry, Nippon Bunri University, Japan
Google 
2023  Dec.  (1 week) 
Algebraic Number Theory and Related Topics 2023, RIMS, Kyoto University, Japan
RIMS 
2023  Dec.  (3 days) 
Niigata Algebra Symposium, Niigata University, Japan
Niigata 
2023  Oct.  (1 week) 
Kinosaki algebraic geometry symposium 2023, Kinosaki International Arts Center, Japan
WordPress 
2023  Oct.  (1 week) 
International workshop on Birational Geometry, Nagoya Univeristy, Japan
WordPress 
2023  Sep.  (1 week) 
MFORIMS Tandem workshop 2023  Arithmetic Homotopy and Galois Theory, RIMS, Kyoto Univeristy, Japan
AHGT IRN 
2023  Sep.  (1 day) 
Number theory joint seminar, Department of Mathematics, Kyoto Univeristy, Japan
Kyoto 
2023  Aug.  (4 days) 
The 68th Algebra Symposium, Nagoya University, Japan
MSJ 
2023  Mar.  (1 week) 
Arithmetic & Homotopic Galois Theory 2023, RIMS, Kyoto Univeristy, Japan
AHGT IRN 
2023  Feb.  (2 days) 
Yufuin Workshop on Algebraic Geometry, Nippon Bunri University, Japan
Google 
2022  Nov.  (1 week) 
Rationality, Moduli Spaces, and Related Topics, Nagoya University, Japan WordPress 
2021  Mar.  (1 week) 
Homotopic and Geometric Galois Theory, Zoom (Oberwolfach, Germany) MFO 
2021  Feb.  (1 day) 
Special lectures. In honor of Professor Shigefumi Mori's 70th Birthday, Zoom (Kyoto, Japan) 
2021  Feb.  (3 days) 
Degenerations and models of algebraic varieties and related topics, Zoom (Kobe, Japan) Google

2019  Nov.  (1 week) 
The 41st Symposium on Commutative Algebra, Kurashiki Seaside Hotel, Japan
Google 
2019  Oct.  (1 week) 
Kinosaki algebraic geometry symposium 2019, Kinosaki International Arts Center, Japan 
2019  Sep.  (2 weeks) 
National Center for Theoretical Sciences (NCTS),
National Taiwan University, Taiwan NTU 
2019  Sep.  (1 week) 
The 27th Summer School on Number Theory, Tohoku University of Community Service and Science, Koeki Hall, Japan
Google 
2019  Aug.  (3 weeks) 
National Center for Theoretical Sciences (NCTS),
National Taiwan University, Taiwan NTU 
2018  Mar.  (1 week) 
Algebraic Geometry and Moduli Theory, Conference in Honor of Shigeru Mukai's Retirement, RIMS, Kyoto Univeristy, Japan
Nagoya 
2018  Jun.  (1 week) 
Université PierreetMarieCurie (Paris VI) et Université ParisSud, Paris, Orsay, France 
2018  Jun.  (1 day) 
Séminaire N. Bourbaki, Institut Henri Poincaré, Paris, France ENS 
2018  Jun.  (2 days) 
International Workshop on Algebra, National Center for Theoretical Sciences (NCTS),
National Taiwan University, Taiwan NTU 
2018  May  (3 days) 
Profinite monodromy, Galois representations, and Complex functions, In honor of Professor Yasutaka Ihara's 80th Birthday, RIMS, Kyoto University, Japan
RIMS 
2018  Mar.  (1 week) 
Motives in Tokyo, on the occasion of Shuji Saito's 60th Birthday, The University of Tokyo, Japan
Chiba 
2017  Dec.  (1 week) 
Algebraic Number Theory and Related Topics 2017, RIMS, Kyoto University, Japan
RIMS 
2017  Oct.  (1 week) 
Kinosaki algebraic geometry symposium 2017, Kinosaki International Arts Center, Japan
Google 
2017  Sep.  (1 week) 
Workshop on padic Lfunctions and algebraic cycles, National Taiwan University, Taiwan
NTU 
2017  Aug.  (6 weeks) 
National Center for Theoretical Sciences (NCTS),
National Taiwan University, Taiwan NTU 
2017  Jul.  (1 week) 
Iwasawa 2017, The University of Tokyo, Japan
Tokyo 
2017  Jun.  (3 days) 
Journées Algophantiennes Bordelaises 2017, Institut de Mathématiques de Bordeaux, Université Bordeaux, France
Bordeaux 
2016  Nov.  (1 week) 
Algebraic Number Theory and Related Topics 2016, RIMS, Kyoto University, Japan
RIMS 
2016  Oct.  (3 days) 
Researches on isometries from various viewpoints, RIMS, Kyoto University, Japan 
2016  Sep.  (1 week) 
JapanTaiwan Joint Conference on Number Theory 2016, National Taiwan University, Taiwan
NTU 
2016  Aug.  (7 weeks) 
National Center for Theoretical Sciences (NCTS),
National Taiwan University, Taiwan NTU 
2016  Jul.  (1 week) 
Rationality and selfmaps of algebraic varieties, RIMS, Kyoto University, Japan
RIMS 
2015  Sep.  (3 days) 
New developments and progress in mathematics via computer algebra system,
RIMS, Kyoto University, Japan
Kanazawa 
2015  Sep.  (3 days) 
The 4th International Congress on Natural Sciences (ICNS2015),
National Changhua University of Education, Taiwan
NCUE 
2015  Aug.  (4 weeks) 
National Center for Theoretical Sciences (NCTS),
National Taiwan University, Taiwan NTU 
2015  Jul.  (2 days) 
Kálmán Győry 75 Symposium, University of Debrecen, Hungary
Győry 75 
2015  Jul.  (1 week) 
29th Journées Arithmétiques (JA2015), University of Debrecen, Hungary
JA2015 
2015  Mar.  (1 week) 
Joint Seminar and Reseach Camp (JSRC2015) CNiigata University, Japan
JSRC2015 
2014  Dec.  (1 week) 
National Center for Theoretical Sciences (NCTS) Taipei Office,
National Taiwan University, Taiwan NTU 
2014  Sep.  (1 week) 
New Developments in Algebraic Geometry, National Taiwan University, Taiwan
NTU 
2014  Aug.  (4 weeks) 
National Center for Theoretical Sciences (NCTS) Taipei Office,
National Taiwan University, Taiwan NTU 
2014  Aug.  (2 weeks) 
SEOUL ICM 2014, Coex, Seoul, Korea
SEOUL ICM 2014 
2014  Jul.  (1 week) 
Kyoto Workshop on Algebraic Varieties and Automorphism Groups, RIMS, Kyoto University, Japan
Niigata 
2013  Oct.  (3 days) 
The 3rd International Congress on Natural Sciences with Sisterhood Universities
(ICNS2013), Niigata University, Japan
ICNS2013 
2013  Sep.  (1 day) 
NishiWaseda Seminar on Number Theory, In honor of Professor Shizuo Endo's 80th Birthday, Waseda University, Japan 
2013  Sep.  (1 week) 
Thue 150, Institut de Mathématiques de Bordeaux, Université Bordeaux 1, France
Thue 150 
2013  Aug.  (3 weeks) 
National Center for Theoretical Sciences (NCTS) Taipei Office,
National Taiwan University, Taiwan NTU 
2012  Dec.  (1 week) 
Algebraic Number Theory and Related Topics, RIMS, Kyoto University, Japan
Tokyo 
2012  Aug.  (3 weeks) 
National Center for Theoretical Sciences (NCTS) Taipei Office,
National Taiwan University, TaiwanNTU 
2011  Aug.  (5 weeks) 
National Center for Theoretical Sciences (NCTS) Taipei Office,
National Taiwan University, Taiwan NTU 
2010  Oct.  (3 weeks) 
Taida Institute for Mathematical Sciences (TIMS),
National Taiwan University, Taiwan TIMS 
2009  Dec.  (1 week) 
The Joint Conference of ASCM2009 and MACIS2009, JAL Resort Sea Hawk Hotel Fukuoka, Japan
Kyushu 
2008  Nov.  (1 week) 
The JapanKorea Joint Seminar on Number Theory and Related Topics 2008, Tohoku University, Japan
Tohoku 
2008  Aug.  (1 week) 
The 5th JapanChina Seminar on Number Theory, Kinki University, Japan
World Scientific 
2008  Jun.  (1 week) 
Foundations of Computational Mathematics, City University of Hong Kong, China
FoCM'08 
2007  Dec.  (1 week) 
Algebraic Number Theory and Related Topics, RIMS, Kyoto University, Japan
Osaka 
2007  Jul.  (2 weeks) 
National Center for Theoretical Sciences (NCTS) Taipei Office,
National Taiwan University, Taiwan NTU 
2007  Jun.  (1 week) 
National Center for Theoretical Sciences (NCTS), Math. Division,
National Tsing Hua University, Taiwan NCTS 
2006  Dec.  (1 week) 
International Conference on Number Theory, HarishChandra Research Institute (HRI), India
HRI 
2005  Sep  (1 week) 
Galois groups and algebraic equations,
Kagoshima University, Japan
UEC 
2005  Jul.  (1 day) 
Vortrag in der Arbeitsgemeinschaft
über Algebra, Technische Universität
München, Germany

2005  May  (1 day) 
Oberseminar AlgebraZahlentheorie, RuprechtKarlsUniversität Heidelberg, Germany

2005  May  (1 day) 
Kolloquium in Universität des
Saarlandes, Universität des Saarlandes Germany,
Saarlandes 
2004  Sep.  (1 year) 
Guest Researcher of Prof. Manfred Knebusch, Universität Regensburg, Germany
Regensburg 