• 2025: Laboratoire de Mathématiques Blaise Pascal, UMR 660: Clermont-Ferrand, France (By Professor  Dominique Manchon).

• 2024: Graduate School of Mathematical Sciences, The University of Tokyo, Japan (By Professor Toshiyuki  Kobayashi).

• 2024: Laboratoire de Mathématiques Blaise Pascal, UMR 660: Clermont-Ferrand, France (By Professor  Dominique Manchon).

• 2023: Osaka Metropolitan University (By Professor  Hideyuki  Ishi).

• 2023: University of Tottori, Japan. (By Professor Junko Inoue).

• 2022: Osaka Metropolitan University (By Professor Hideyuki  Ishi).

• 2020: University of Lorraine (Metz). (By Professors Camille Laurent-Gengoux and Jean Ludwig).

• 2019: IHES (Institut des Hautes Études Scientifiques, UNIVERSITÉ PARIS-SACLAY). (By Professor Fanny Kassel).

• 2019: Graduate School of Mathematics, Nagoya University. (By Professor Hideyuki  Ishi).

• 2018: IHES (Institut des Hautes Études Scientifiques, UNIVERSITÉ PARIS-SACLAY): https://www.ihes.fr/

• 2018: University of Clermont-Ferrand. University Blaise Pascal. (By Professor  Dominique Manchon).

• 2017: University of Tokyo. (By Professor Toshiyuki Kobayashi).

• 2017: University of Tottori and Tsukuba. (By Professors  Junko Inoue and James Cole).

• 2017: University of Metz. (By Professor Jean Ludwig).

• 2015: University of Tottori and University of Nagoya. (By Professors Junko Inoue and Hideyuki  Ishi).

• 2013: University of Clermont-Ferrand. University Blaise Pascal. (By Professor Dominique Manchon).

• 2012-2013: JSPS grant. (Fukuoka, Tottori and Tokyo) (By Professor Hidenori Fujiwara).

• 2012: University of Metz. (By Professor Jean Ludwig).

• 2012 University of Tottori. (By Professor Junko Inoue).

• 2012: University of Allahabad. Harish-Chandra Institute. (By Professor Ratnakumar P. K).

• 2011: University of Oulou (Finland). (By Professor Mahmoud Filali).

• 2011: University of Clermont-Ferrand.University Blaise Pascal. (By Professor Dominique Manchon).

• 2011: University of Metz. (By Professor Jean Ludwig).

• 2010: University of Clermont-Ferrand. University Blaise Pascal. (By Professor Dominique Manchon).

• 2009: University of Clermont-Ferrand. University Blaise Pascal. (By Professor Dominique Manchon).

• 2009: University of Kinki, Fukuoka, Japan. Institute of Technology. (By Professor  Hidenori Fujiwara).

• 2008: Universities of Clermont-Ferrand and Bourgogne. (By Professors Dominique Manchon and Didier Arnal).

• 2008: Indian Institute of Science, Bangalore (India). (By Professor Sunduram Thangavelu).

• 2008: University of Paderborn (Germany). (By Professor Eberhard Kanuith).

• 2007: University of Luxembourg. Département de Mathématiques. (By Professor Carine Molitor-Braun).

• 2007: Universities of Clermont-Ferrand and Bourgogne. (By Professors Dominique Manchon and Didier Arnal).

• 2007 : Max-Planck Institute. Bonn, (Germany). (By Professor Bernhard Krötz).

• 2007: RIMS, Kyoto. (By Professor Toshiyuki  Kobayashi).

• 2007: University of Kinki, Fukuoka, Japan. Institute of Technology. (By Professor  Hidenori Fujiwara).

• 2006: University of Paderborn (Germany). (By Professor Eberhard Kanuith).

• 2006: University of Clermont-Ferrand. University Blaise Pascal. (By Professor Dominique Manchon, Project CNRS-DGRST).

• 2004 : RIMS, Kyoto. (By Professor Toshiyuki  Kobayashi).

• 2002 and 2003 : University of Clermont-Ferrand (France). University Blaise Pascal. (By Professor Dominique Manchon, Project CNRS-DGRST).

• 2002: University of Kinki, Fukuoka, Japon. Institute of Technology. (By Professor Hidenori Fujiwara).

• 2001 : University of Nancy (France). Institut Henri Poincaré. (By Professor Dominique Manchon, Project CNRS-DGRST).

• 1999: Saint-Louis, Missouri, USA. The Department of Mathematics and Computer Sciences. (By Professors Chal Benson and Gail Ratcliff).

• 1998 and 2000: University of Metz (France). (By Professor Jean Ludwig).