2024. 

1. A counterexample to the PIA conjecture, One day workshop on complex and algebraic geometry, Tokyo University, July 17, 2024. 

2. Some conjectures of a singularity invariant in minimal model theory, Colloquium, Nagoya University, May 8, 2024. 

3. Toward an Ehrhart theory of periodic graphs, Algebraic Geometry Seminar, Nagoya University, April 26, 2024. 

2023.

1. Shokurov’s index conjecture and PIA conjecture for quotient singularities, Kinosaki Algebraic Geometry Symposium 2023, Kinosaki International Art Center, Japan, October 24-27, 2023,

2. Minimal log discrepancies of quotient singularities, Recent Developments in Algebraic Geometry, Arithmetic and Dynamics Part 2, National University of Singapore, August 14-September 1, 2023. 

3. Ehrhart theory on periodic graphs, Algebra Seminar, Kyushu University, July 21, 2023. [slide]

4. Ehrhart theory of periodic graphs, FRG Special Month in Ann Arbor, Michigan University, June 1, 2023. 

5. Minimal log discrepancies of quotient singularities, FRG Special Month in Ann Arbor, Michigan University, May 24, 2023. 

6. Toward an Ehrhart theory of periodic graphs, Order seminar in Osaka, Osaka University, March 29, 2023. 

7. Ehrhart theory of periodic graphs, The 1st Algebraic geometry Atami symposium, Atami, Japan, February 7-11, 2023. 

2022.

1. Minimal log discrepancies of quotient singularities (online talk), Birational Geometry Workshop at BIMSA, BIMSA, China, October 21-22, 2022. 

2. Minimal log discrepancies of quotient singularities, Symposium on Algebra 2022, RIMS, Japan, August 30- September 2, 2022. 

3. Minimal log discrepancies of quotient singularities, Algebraic Geometry Seminar, Nagoya University, Japan, June 23, 2022. 

4. Inversion of adjunction for quotient singularities, JAMI Conference 2022: Higher Dimensional Algebraic Geometry (in honor of Prof. Shokurov's 70th Birthday), Johns Hopkins University, US, 3-8 May, 2022. 

2021.

1. Inversion of adjunction for quotient singularities, Algebraic Geometry and Related Topics, National Taiwan University, Taiwan, December 9-10, 2021.

2. Minimal log discrepancies of quotient singularities, Interactions of new trends in Algebraic Geometry and singularities, OIST, Japan, October 11-15, 2021. 

3. Inversion of adjunction for quotient singularities, Zoom Algebraic Geometry Seminar, February 16, 2021. [slide]

4. Inversion of adjunction for quotient singularities, Fudan-SCMS AG Seminar, Fudan University, China, January 7, 2021. 

2020. 

1. Inversion of adjunction for quotient singularities, Singularity Seminar, Nihon University, Japan, December 7, 2020. 

2. (Cancelled) JAMI program  Higher Dimensional Algebraic Geometry, Johns Hopkins University, US, March 16-22. 

3. Rational point problem on singular Fano varieties, Singularities and Arithmetics, Tohoku University, Sendai, February 17 - 20, 2020. 

2019.

1. Rational point problem on singular Fano varieties, Algebraic Geometry Seminar, Michigan University, US, December 11, 2019. 

2. Rational point problem on singular Fano varieties, Algebraic Geometry Seminar, Princeton University, US, November 19, 2019.

3. Rational point problem on singular Fano varieties, Number Theory/Algebraic Geometry Seminar, Boston College, US, November 7, 2019.

4. Rational point problem on singular Fano varieties, Tokyo Denki University, Japan, June 14, 2019. 

5. Intensive course at Nagoya University (on Esnault's rational point formula on Fano varieties), Japan, June 3-7, 2019. 

6. A rational point problem on Fano varieties, Higher Dimensional Arithmetic Geometry, Kumamoto University, Japan, February 18-21, 2019.

2018. 

1. Dual Complex of Fano Varieties and an Application to Vanishing of Witt Vector Cohomology, Algebraic Geometry Seminar, National Cheng Kung University (NCKU), Taiwan, December, 21.

2. A Rational Point Problem on Fano Varieties, Colloquium, National Cheng Kung University (NCKU), Taiwan, December, 21. 

3. Dual complex of Fano varieties and an application to vanishing of Witt vector cohomology, Workshop on Birational Geometry and Related Topics, Shanghai Center for Mathematical Sciences, China, November 1-10.

4. A vanishing theorem of Witt-vector cohomology of Ambro-Fujino type, Algebraic Geometry in East Asia, Vietnam Academy of Science and Technology, Hanoi, Vietnam, October 23-26. 

5. A vanishing theorem of Witt-vector cohomology of Ambro-Fujino type, Differential, Algebraic and Topological Methods in Complex Algebraic Geometry, Cetraro, Italy, September 6-15.

6. A rational point problem on Fano varieties, Tianyuan Advanced Seminar on the Moduli Spaces in Algebraic Geometry,  Shanghai Center for Mathematical Sciences, China, April 2-7, 2018. 

7. Vanishing theorems of Witt-vector cohomology for Fano threefolds, Higher dimensional algebraic geometry, The University of Tokyo, Japan, March 12-16, 2018. 

8. A rational point problem on singular Fano threefolds, Algebraic Geometry seminar, Kumamoto University, Japan, February 7, 2018.

9. A vanishing theorem of Witt-vector cohomology for Fano threefolds, Algebraic geometry in positive characteristic and related topics, Hosei university, Japan, January 30- February 1, 2018.

2017.

1. A vanishing theorem of Witt-vector cohomology for Fano threefolds, Classification and Moduli Theory of Algebraic Varieties, Hotel Continental Ischia, Italy, September 10-17, 2017.

2. An application of the ACC for LCT'S to the ACC for MLD's, NCTS Workshop in Higher Dimensional Algebraic Geometry, National Taiwan University, Taiwan, June 19-23, 2017.

3. A rational point formula on singular Fano varieties over a finite field, BICMR-Tokyo Algebraic Geometry Workshop, Beijing International Center for Mathematical Research, China, May 5-7, 2017.

4. Birkar's paper "Singularities of linear systems and boundedness of Fano varieties" explanation, NCTS Workshop on Singularities, Linear Systems, and Fano Varieties, National Taiwan University, Taiwan, April 13-16, 2017.

5. Rational points on log Fano threefolds over a finite field, Cambridge--Tokyo Algebraic Geometry workshop 2017, University of Cambridge, U.K., March 16-17, 2017. 

6. New formulation of the number of rational points on singular Fano varieties over a finite field, The 2nd Higher dimensional algebraic geometry Echigo Yuzawa symposium,  Yuzawa-cho Kouminkan, Japan, February 13-17, 2017. 

7. Rational points on log Fano threefolds over a finite field, Workshop on Higher Dimensional Algebraic Geometry, Holomorphic Dynamics and Their Interactions, National University of Singapore, Singapore, January 9-20, 2017.

2016. 

1. A boundedness conjecture for minimal log discrepancies,  Algebraic Geometry Seminar, KIAS, Korea, August 16, 2016.

2. Birkar's paper "Anti-pluricanonical systems on Fano varieties" explanation, Summer School on Algebraic Geometry, Tambara, Japan, September 30- August 3, 2016.

3. Rational points on log Fano threefolds over a finite field, Tokyo-Princeton algebraic geometry conference, Princeton University, U.S., May 7-10, 2016.

4. Rational points on log Fano threefolds over a finite field, Higher dimensional algebraic geometry and around, Kobe-Kyoto 2016, Kobe University, Japan, February 1-3, 2016. 

2015. 

1. On minimal log discrepancies on varieties with fixed Gorenstein index, Singularities and invariants of higher dimensional algebraic varieties, RIMS, Japan, December 14-18, 2015. 

2. Some special cases of the ACC conjecture, The 10-th Anniversary Tokyo-Seoul Conference in Mathematics - Algebraic/Arithmetic/Complex Geometry, Tokyo University, Japan, December 2-5, 2015. 

3. Base point free theorem for log canonical threefolds over the algebraic closure of a finite field, Singularity Seminar, The University of Tokyo, Japan, October 26, 2015. 

4. Cantat's paper "Morphisms between Cremona groups, and characterization of rational varieties" explanation, Summer School on Algebraic Geometry, Tambara, Japan, September 24-28, 2015.

5. Rational points on log Fano three-folds over a finite field I, Higher Dimensional Algebraic Geometry 2015, National Taiwan University, Taiwan, August 19-23, 2015. 

6. Base point free theorem for log canonical threefolds over the algebraic closure of a finite field, 2015 Beijing-Shanghai Weekend Algebraic Geometry Workshop, Fudan university, China, June 19-21, 2015.

7. Some special cases of the ACC conjecture, Algebraic Geometry Seminar, Imperial College London, UK, January 20, 2015.

2014. 

1. On base point free theorem for log canonical three folds over the algebraic closure of a finite field, Algebraic Geometry Seminar, Michigan University, US, December 4, 2014. 

2. On base point free theorem for log canonical three folds over the algebraic closure of a finite field, Algebraic Geometry Seminar, The University of Tokyo, Japan, June 2, 2014. 

3. On base point free theorem of threefolds over finite fields, Mini-Conference on Algebraic Geometry, Saitama University, Saitama, Japan, March 5-6, 2014. 

4. Singularity theory in minimal model program, 26th Symposium on Commutative Ring Theory, Hokkaido University of Education, Japan, January 28-30, 2014. 

5. Minimal model program and singularity theory, East Asian Core Doctorial Forum on Mathematics, Kyoto University, japan,  January 21-24, 2014. 

2013. 

1. On semi-continuity problems for minimal log discrepancies, Algebraic Geometry Seminar, Kyoto University, Japan, November 1, 2013.

2. On semi-continuity problems for minimal log discrepancies, Kinosaki Symposium on Algebraic Geometry, Kinosaki, Japan, October 21-25, 2013.

3. Hacon-Xu's "On the three dimensional minimal model program in positive characteristic" explanation, Summer School on Algebraic Geometry, Tambara, Japan, August 21-25, 2013.

4. On semi-continuity problems for minimal log discrepancies, Algebraic Geometry Seminar, Waseda University, Japan, June 28, 2013.

5. On semi-continuity problems for minimal log discrepancies, Algebraic Geometry Seminar, Osaka University, Japan, April 12, 2013.

6. On semi-continuity problems for minimal log discrepancies, MS Seminar, Kavli IPMU, Japan, April 2, 2013.

7. On semi-continuity problems for minimal log discrepancies, 4th Workshop on Higher Dimensional Algebraic Geometry, National Taiwan University, Taiwan, March 25-29, 2013.

8. On semi-continuity problems for minimal log discrepancies, Algebraic Geometry Seminar, Hokkaido University, Japan, February 19, 2013.

2012. 

1. Ideal-adic semi-continuity of minimal log discrepancies on varieties with a C^* -action, Younger generations in Algebraic and Complex geometry II, Saga University, Japan, December 17-20, 2012. 

2. Ideal-adic semi-continuity of minimal log discrepancies on varieties with a C^* -action, Singularity Seminar, Nihon University, Japan, October 15, 2012. 

Poster session. 

1. Base point free theorem for log canonical threefolds over the algebraic closure of a finite field, AMS Summer Institute in Algebraic Geometry, University of Utah, US, July 12-August 1, 2015. 

2. On base point free theorem for log canonical three folds over the algebraic closure of a finite field, Commutative Algebra and Singularity Theory 2014, Toyama, Japan, July 28-August 1, 2014. 

3. On semi-continuity problems for minimal log discrepancies, Recent Advances in Algebraic Geometry, Michigan University, U.S., May 16-19, 2013.