Talks

Conference and Workshop (88)

2025

• 2025 KMS Annual Meeting, ST Convention Center, Seoul, Korea, Oct 24, 2025
  Data analysis for nondestructive testing
• Glances@Manifolds-2025, Jagiellonian Univ., Krakow, Poland, Sep 1-5, 2025
  Classification of toric manifolds with Pic 4
• 2025 Summer Workshop on Low-dimensional Topology and Related Topics, Kangwon National Univ., Chuncheon, Korea, Aug 11-13, 2025
  Topological classification of Bott manifolds
• Topological Data Analysis and Industrial Mathematics: Bridging Theory and Applications, Nishijin Plaza, Fukuoka, Japan, Aug 5-8, 2025
  Topological Data Analysis for non-destructive testing in Civil engineering
• Planary talk, 2025 Annual meeting of the Kangwon-Kyungki mathematical society, Kyung Hee Univ., Suwon, Korea, Jun 20-21, 2025
  Classification of complete non-singular toric varieties
• The 7th Korea Toric Topology Workshop, KAIST, Daejeon, Korea, Feb 17-19, 2025
  Classification of toric manifolds with Picard number 4

2024

• 2024 KSME, Ajou Univ., Suwon, Korea, Nov 1-2, 2024
  Rank 시스템을 통한 입학사정관의 자동화 가능성 연구
• Ajou-Kyushu-NIMS Workshop, Ramada Hotel Suwon, Suwon, Korea, Sep 28, 2024
  GPU-friendly algorithm for counting PL spheres
• 2024 Dalian International Conference on Mathematics, Dalian Univ. of Technology, Dalian, China, Sep 24-28, 2024
  Toric Lifting Problems
• 2024 Combinatorial Workshop, Chungbuk National Univ., Cheongju, Korea, Aug 28-30, 2024
  Toric Colorability of Simplicial d-Polytopes with d+4 vertices
• Workshop on Toric Topology, Fields Institute for Research in Mathematical Sciences, Toronto, Canada, Aug 23, 2024
  Buchstaber Numbers and Toric Wedge Induction

2023

• Iberoamerican and Pan Pacific International Conference on Topology and its Applications (IPPICTA), Online, Puebla, Mexico, Sep 11-14, 2023
  Cohomology of real toric varieties corresponding to Weyl chambers
• Workshop on Topological Data Analysis: Mathematics, Physics and beyond, Korea Institute for Advanced Study (KIAS), Seoul, Korea, Feb 9, 2023
  GPU-friendly enumeration on simplicial complexes
• 2023 CNN International Conference on math and its application, Online, Chungnam National Univ., Daejeon, Korea, Jan 17, 2023
  Void Detection using Impact-Echo Method based on CWT and CNN

2022

• Workshop on Algebra, Topology and Related Fields, Online, Turkey, Sep 22-23, 2022
  Cohomological rigidity problems in toric topology
• 건국-아주-인하 수학과 연합세미나, Konkuk Univ., Seoul, Korea, Dec 17, 2012
  Rational Betti number of generalized real Hassenberg varieties and new graph invariants
• The 6th Korea Toric Topology Workshop, KAIST, Daejeon, Korea, Jul 11-13, 2022
  Industrial math in civil engineering
• 2022 KMS Spring Meeting, Online, Korean Mathematical Society, Korea, Apr 28-29, 2022
  Toric colorizable PL spheres with a few vertices
• Toric Topology 2022 in Osaka, Online, OCAMI (Osaka City Univ.), Osaka, Japan, Mar 23-25, 2022
  Cohomological rigidity for Bott manifolds

2021

• Topology of torus actions and related topics, Online, Sirius Mathematics Center, Sochi, Russia, Oct 25-29, 2021
  Puzzle algorithm for finding mod $2$ characteristic maps over wedged simplicial complexes

2020

• The 8th East Asian Conference on Algebraic Topology(EACAT), VIASM and VNI, Hanoi, Vietnam, Dec 14-18, 2020
  (Plenary talk) TBA
• Topology and geometry of group actions, Online conference, Russia, Nov 18-22, 2020
  Gromov width of symplectic toric manifolds associated with graph associahedra
• 2020 KMS Annual Meeting, Virtual conference, Korea, Oct 23-24, 2020
  real toric manifold, and its cohomology
• Workshop on Polyhedral Products in Homotopy Theory, The Fields Institute, Toronto, Canada, Jan 20-24, 2020
  Topology of real moment-angle complexes and real toric spaces

2019

• Toric Topology 2019 in Okayama, Okayama Univ. of Science, Okayama, Japan, Nov 18-21, 2019
  On the classification of (real) toric manifolds of Picard number 4
• The 3rd Pan Pacific International Conference on Topology and Applications (PPICTA), Xiangyu Hotel, Chengdu, China, Nov 8-13, 2019
  Topology of real toric manifolds and its application
• 2019 International conference of The Kangwon-Kyungki Mathematical Society, Daegu Gyeongbuk Design Center, Daegu, Korea, Jun 28-30, 2019
  Small cover and cohomological rigidity problem
• Mini workshop on toric topology and related topics, Korea Chamber of Commerce and Industry, Seoul, Korea, May 27, 2019
  On the real toric spaces
• The 6th International Electric Vehicle Expo, private session organized by Ajou Univ., ICC Jeju, Jeju, Korea, May 7-11, 2019
  Topological Data Analysis on Object Detection

2018

• Ajou Data Science Forum-Data Science in Finance, Ajou Univ., Suwon, Korea, Dec 14, 2018
  Topological Data Analysis on Image classification
• 2018 Joint Meeting of the Korean Mathematical Society and the German Mathematical Society, COEX, Seoul, Korea, Oct 3-6, 2018
  Torsions in the cohomology of real toric manifold
• 88th KPPY Combinatorics Workshop, Yeungnam Univ., Daegu, Korea, Aug 31, 2018
  Betti numbers of real toric varieties associated to Weyl chambers
• 20th KIAS Combinatorics Workshop, Duksung Women’s Univ., Seoul, Korea, Jun 1-2, 2018
  Weyl group action on real toric manifolds and its geometric representations
• Algebraic Topology, Combinatorics, and Mathematical Physics, Steklov Mathematical Institute, Moscow, Russia, May 24-30, 2018
  Cohomology formulae of real toric spaces
• 2018 KMS Spring Meeting, Kyung Hee Univ., Seoul, Korea, Apr 20-22, 2018
  Title 1: Cohomology of real toric spaces; Title 2: Industrial math on civil engineering

2017

• Encounter in Topology ’n Algebra, Scuola Superiore di Catania, Catania, Italy, May 31-Jun 4, 2017
  Finite group action on real toric variety and its geometric representations

2016

• 79th KPPY Combinatorics Workshop, Kyungpook National Univ., Daegu, Korea, Oct 8, 2016
  Acyclic digraphs and real Bott manifolds

2015

• The 6th East Asian Conference on Algebraic Topology(EACAT), NIMS, Daejeon, Korea, Nov 30-Dec 4, 2015
  Homology of real toric varieties associated to Weyl groups
• International Open Chinese-Russian Conference-Torus Actions: Topology, Geometry and Number Theory, Chinese Academy of Sciences, Beijing, China, Oct 26-29, 2015
  The Betti numbers of real toric varieties associated to Weyl groups of regular types
• Combinatorial Constructions in Topology, Univ. of Regina, Regina, SK, Canada, Aug 17-21, 2015
  A new family of projective toric manifolds
• 2015 KMS Spring Meeting, Pusan National Univ., Pusan, Korea, Apr 24-26, 2014
  On the topology of real toric spaces
• Geometry and Topology, Princeton Univ., Princeton, NJ, USA, Mar 18-21, 2015
  Construction of a small cover with odd torsion
• 7th KIAS Combinatorics Workshop, KIAS, Seoul, Korea, Mar 13-14, 2015
  Small cover and puzzle
• Perspectives in Lie Theory-session: Algebraic topology, geometric and combinatorial group theory, Centro di Ricerca Matematica-Ennio De Giorgi, Pisa, Italy, Feb 8-28, 2015
  Cohomology of small cover and its torsion

2014

• 2014 KAIST CMC Discrete Math Workshop, KAIST, Daejeon, Korea, Dec 10-12, 2014
  The Betti numbers of real toric varieties corresponding to generalized graph associahedra
• Seoul ICM 2014, COEX, Seoul, Korea, Aug 13-21, 2014
  Title 1 (Topology): Topology of generalized Bott manifolds; Title 2 (Combinatorics): Graph invariants arising from toric topology
• ICM 2014 Satellite conference: Topology of torus actions and applications to geometry and combinatorics, Daejeon Convention Center, Daejeon, Korea, Aug 7-11, 2014
  On the classification of toric varieties
• 64th KPPY Combinatorics Workshop, Kyungpook National Univ., Daegu, Korea, Jun 20, 2014
  The a-number of graphs and the topology of small covers
• 2014 KMS Spring Meeting, Gangneung-Wonju National Univ., Gangneung, Korea, Apr 24-26, 2014
  Cohomological rigidity problem for toric manifolds
• The 12th Korea-Japan Workshop on Algebra and Combinatorics, KAIST, Daejeon, Korea, Jan 23-25, 2014
  Enumeration of toric objects and wedge operation on simplicial complexes.

2013

• The 5th East Asian Conference on Algebraic Topology (EACAT), Chinese Academy of Sciences, Beijing, China, Dec 2-6, 2013
  On the cohomology of real toric manifolds
• 2013 Combinatorics Workshop, NIMS, Daejeon, Korea, Aug 7-9, 2013
  Introduction to the a-number of graphs and hypergraphs
• The Asian Mathematical Conference (AMC) 2013, BEXCO, Busan, Korea, Jun 30-Jul 4, 2013
  Wedge operations and torus symmetries
• Joint International Meeting of the AMS and the Romanian Mathematical Society, Univ. of Alba Iulia, Alba Iulia, Romania, Jun 27-30, 2013
  Wedge operations and torus symmetries

2012

• Toric Topology 2012 in Osaka, Osaka City Univ., Osaka, Japan, Nov 16-19, 2012
  On the toric rigidity of simple polytopes
• 2012 Combinatorial workshop, Chonnam National Univ., Gwangju, Korea, Aug 9, 2012
  Polytopes and combinatorics in toric topology
• 2012 The KMS Spring Meeting, Sookmyung Women’s Univ., Seoul, Korea, Apr 28, 2012
  Different moment-angle manifolds arising from two polytopes having the same bigraded Betti numbers
• Princeton-Rider Workshop on Homotopy Theory and Toric Spaces (sponsored by Algebraic Topology Seminar), Rider Univ., Lawrenceville, NJ, USA, Feb 23-25, 2012
  Toric rigidity of simple polytopes and moment-angle manifolds

2011

• International Conference "Toric Topology and Automorphic Functions", Pacific National Univ., Khabarovsk, Russia, Sep 5-10, 2011
  Classification of Bott manifolds, and cohomological rigidity problems
• Workshop of Department of Mathematical Sciences, KAIST, Lotte Resort, Buyeo, Korea, Jul 26-27, 2011
  Topology of toric manifolds
• Conference: Toric Methods in Homotopy Theory and Related Subjects, Queens Univ., Belfast, UK, Jul 18-20, 2011
  Invariance of Pontrjagin classes of generalized Bott manifolds

2010

• The 37th Symposium of Transformation Groups, Kyushu Univ., Kyushu, Japan, Nov 23-24, 2010
  Cohomological rigidity of polytopes in toric topology
• Topological methods in toric geometry, symplectic geometry and combinatorics, BIRS, Banff, AB, Canada, Nov 7-17, 2010
  Torus actions on cohomology generalized Bott manifolds
• The Homotopy Theory Symposium 2010, Kyushu Univ., Kyushu, Japan, Oct 31-Nov 3, 2010
  Torus actions on cohomology Bott manifolds
• Workshop on Geometry & Topology 2010, Univ. of Fribourg, Fribourg, Switzerland, Sep 16-18, 2010
  Real Bott manifolds and acyclic digraphs
• Group Actions in Topology and Analysis-4th GAF Conference, Univ. of Milano-Bicocca, Milan, Italy, Sep 13-17, 2010
  Invariance of Pontrjagin classes of Bott manifolds
• RIMS conference 2010 Transformation Groups and Surgery Theory, RIMS, Kyoto, Japan, Aug 30-Sep 3, 2010
  Invariance of Pontrjagin classes of Bott manifolds
• The International Conference "GEOMETRY, TOPOLOGY, ALGEBRA and NUMBER THEORY, APPLICATIONS", Steklov Mathematical Institute, Moscow, Russia, Aug 16-20, 2010
  Real Bott manifolds and acyclic digraphs
• The 3rd Topology Workshop, KAIST, Daejeon, Korea, Aug 3-4, 2010
  Real Bott manifolds and acyclic digraphs
• International Conference on Algebraic and Geometric topology, Capital Normal Univ., Beijing, China, Jun 28-Jul 2, 2010
  Invariance of Pontrjagin classes of Bott manifolds
• Workshop on Toric Topology and Related Topics, Fudan Univ., Shanghai, China, May 2-5, 2010
  The classification of four-stage Bott manifolds
• Toric Topology 2010 in Himeji, Egret-Himeji, Himeji, Japan, Apr 10-11, 2010
  Homology group of moment angle complex of certain polytopes
• KAIST Toric Topology Workshop 2010, KAIST, Daejeon, Korea, Feb 22-26, 2010
  Combinatorial rigidity of 3-dimensional simplicial polytopes

2009

• The 3rd East Asia Conference on Algebraic Topology, Vietnam National Univ., Hanoi, Vietnam, Dec. 14-18, 2009
  Classification of Q-trivial Bott manifolds
• Toric Topology Seminar in Osaka, 2009, Osaka City Univ., Osaka, Japan, Dec. 7-9, 2009
  Classification of Q-trivial Bott manifolds
• Bratislava Topology Symposium "Group Actions and Homogeneous Spaces", Comenius Univ., Bratislava, Slovakia, Sep. 7-11, 2009
  Real Bott manifolds and acyclic digraphs
• Transformation groups from a new viewpoint, RIMS, Kyoto, Japan, Aug. 17-20, 2009
  The number of small covers over cubes
• The Korean Mathematical Society 09 Spring Symposium, Ajou Univ., Suwon, Korea, 25. Apr, 2009
  Tor-algebra and Cohomological Rigidity of Simple Polytopes with Few Facets
• Korea-Japan Workshop on Algebra and Combinatorics, Pusan National Univ., Pusan, Korea, Feb. 9-10, 2009
  Tor-algebra and Cohomological rigidity of simple polytopes with few facets
• 2009 ASARC Workshop at Daecheon, Daecheon, Korea, Jan. 29-31, 2009
  On the topological classification of toric manifolds

2008

• The 2nd East Asia Conference on Algebraic Topology, National Univ. of Singapore, Singapore, Singapore, Dec. 15-19, 2008
  Properties of Bott towers in Toric Topology
• The 28th PNU-POSTECH Algebraic Combinatorics Seminar, Pusan National Univ., Pusan, Korea, 15th Nov 2008
  Combinatorics on bigraded Betti numbers of simple polytopes
• 2008 Global KMS International Conference, Jeju Internationl Convention Center, Jeju, Korea, 23th-25th Oct 2008
  Toric cohomological rigidity of simple polytopes
• 2008 ASARC-Conference on transformation group theory, KAIST, Daejon, Korea, 29th Aug 2008
  Properties of Bott tower
• 2008 Workshop on Combinatorics, Sungkyunkwan Univ., Suwon, Korea, 7th-8th Aug 2008
  Cohomological Rigidity of simple polytopes
• New Horizons in Toric Topology, Univ. of Manchester, Manchester, UK, 7th-11th Jul 2008
  The number of small covers over cubes; Toric cohomological rigidity of simple polytopes
• The Korean Mathematical Society 08 Spring Symposium, Keimyoung Univ., Daegu, Korea, 26. Apr, 2008
  The number of small covers over cubes

2007

• Osaka City Univ. Summer School on symplectic Geometry and toric topology, Osaka City Univ., Osaka, Japan, 17th-27th. Jul, 2007
  The cohomology ring and Bott tower structure

Colloquium and Seminar (44)

2026

• Invited talk, Fudan Univ., Shanghai, China, Apr 16, 2026
  Toric manifolds and PL spheres
• Colloquium, Chonnam National Univ., Gwangju, Korea, Mar 26, 2026
  Toric varieites and simplicial complexes
• Invited talk, POSTECH, Pohang, Korea, Feb 4, 2026
  Mathematical approaches to nondestructive inspection
• ALGO Lunch Seminar, Université libre de Bruxelles (ULB), Brussels, Belgium, Jan 7, 2026
  A decomposition of graph a-numbers

2025

• Invited talk, GIST, Gwangju, Korea, Aug 29, 2025
  What shapes can support a toric fan?
• Colloquium, Gongju Univ., Gongju, Korea, Apr 30, 2025
  분류로의 여행 : 위상수학
• Seminar talk, KICT, Ilsan, Korea, Apr 16, 2025
  Industrial math in civil engineering

2024

• Seminar talk at BIMSA, Online, Beijing Institute of Mathematical Sciences and Applications (BIMSA), Beijing, China, Jun 6, 2024
  Maximal Buchstaber Number and Toric Wedge Induction

2023

• Colloquium, NIMS, Suwon, Korea, Jan 19, 2023
  GPU-friendly enumeration for mathematical algorithms on simplicial complexes

2022

• 전력연구원 특강, KEPCO KEPRI, Daejeon, Korea, Jul 28, 2022
  Industrial math in Civil Engineering
• 연구교류세미나 at NIMS, NIMS, Suwon, Korea, Feb 7, 2022
  토목 분야에서의 산업수학

2021

• Colloquium, Ulsan Univ., Ulsan, Korea, Nov 11, 2021
  위상적데이터분석(TDA)의 산업수학에서의 활용
• International polyhedral product seminar, Online, Princeton Univ., USA, Oct 21, 2021
  On the classification of real toric manifolds

2018

• Invited talk, IBS-CGP, Pohang, Korea, Aug 30, 2018
  On the topology of real toric manifolds
• Invited talk, Ryukyu Univ., Nakagami-gun, Okinawa, Japan, Jul 30, 2018
  topology of real toric spaces
• Special Lectures at Sungkyunkwan Univ., Sungkyunkwan Univ., Suwon, Korea, Apr 13, 2018
  Topology of real toric varieties
• Colloquium, Ajou Univ., Suwon, Korea, Apr 13, 2018
  The cohomology rings of real toric spaces
• Invited talk at Osaka City Univ., Osaka City Univ., Osaka, Japan, Feb 26, 2018
  Cohomology of real toric spaces

2017

• Algebraic Topology Seminar, Princeton Univ., Princeton, NJ, USA, Nov 30, 2017
  Multiplicative structure of the cohomology of real toric spaces
• Invited talk, Western Univ., London, ON, Canada, Nov 22, 2017
  Introduction to real toric spaces
• Colloquium talk, The Univ. of Texas Rio Grande Valley, Edinburg, Texas, USA, Apr 27, 2017
  Topology and combinatorics of real toric manifolds

2016

• Invited seminar, Osaka City Univ., Osaka, Japan, Jul 27, 2016
  Geometric representation of Weyl groups on the corresponding real toric manifolds
• Colloquium, KAIST, Daejeon, Korea, Mar 10, 2016
  Topology of real toric spaces
• Invited series seminar, Fudan Univ., Shanghai, China, Jan 6-7, 2016
  Topology and Combinatorics of real toric spaces

2015

• Invited series seminar, KAIST, Daejeon, Korea, Oct 7, 14, 21, 2015
  Topology and Combinatorics of real toric spaces
• Topology Seminar, Univ. of Southampton, Southampton, UK, Feb 2, 2015
  The cohomology and their torsion of real toric manifolds

2014

• Colloquium, Sogang Univ., Suwon, Korea, Sep 11, 2014
  Classification of toric varieties
• Invited Seminar, NIMS, Daejeon, Korea, Jun 3, 2014
  Topology of small covers

2013

• KAIST Discrete Math Seminar, KAIST, Daejeon, Korea, Nov 18, 2013
  The rational Betti number of small covers and its combinatorics
• International Open Chinese-Russian conference "Torus Actions: Topology, Geometry and Number Theory", Pacific National Univ., Khabarovsk, Russia, Sep 2-7, 2013
  Classification of torus manifolds and wedge operations
• Algebraic Combinatorics Seminar, KIAS, Seoul, Korea, Aug 26, 2013
  The number of real toric varieties
• Algebraic Topology Seminar, Princeton Univ., Princeton, NJ, USA, Feb 21, 2013
  Wedge operations and torus symmetries
• Univ. of Minnesota Combinatorics Seminar, Univ. of Minnesota, Minneapolis, Minnesota, USA, Feb 15, 2013
  A new graph invariant arises in toric topology: rational Betti numbers of real toric varieties arising from graphs
• Invited Seminar, Osaka City Univ., Osaka, Japan, Jan 23, 2013
  Wedge operation and symmetry of manifolds

2012

• Algebraic topology seminar at Princeton Univ., Princeton Univ., Princeton, NJ, USA, Feb 16, 2012
  Cohomological rigidity problems in Toric topology

2011

• 건국-아주-인하 수학과 연합세미나, Inha Univ., Incheon, Korea, Dec 9, 2011
  Classification problems in toric topology
• Invited Seminar: Program of Low dimensional topology seminar, Max Planck Institute for Mathematics, Bonn, Germany, Jul 11, 2011
  Topological Classification of Bott manifolds
• Colloquium, Ajou Univ., Suwon, Korea, Jun 10, 2011
  Introduction to toric topology and cohomological rigidity problems
• Invited Seminar, Topology regular seminar, Seoul National Univ., Seoul, Korea, May 17, 2011
  Classification of Bott manifolds

2010

• Invited Seminar, Ajou Univ., Suwon, Korea, Dec 10, 2010
  Topology of torus manifolds
• Colloquium, Osaka City Univ., Osaka, Japan, Nov 17, 2010
  Toric topology and polytope theory
• Invited Seminar, Okayama Univ., Okayama, Japan, Apr 13, 2010
  Cohomological rigidity problem and Q-trivial Bott manifold
• Ikuta Seminar on Toric Topology, Meiji Univ., Tokyo, Japan, Mar 6-7, 2010
  Invariant of real Bott manifolds

2009

• KAIST combinatorics Seminar, KAIST, Daejon, Korea, Feb. 4-5, 2009
  Cohomological rigidity of simple polytopes with few facets

Public Lectures and Special Lectures (11)

2026

• 대한수학회 2026 Young Mathematician Camp, Yonsei Univ., Incheon, Korea, Jan 26-29, 2026
  다양체와 다면체의 만남

2025

• 2025 불어권협력센터 릴레이세미나, Ajou Univ., Suwon, Korea, Dec 11, 2025
  페르마에서 푸앵카레까지 난제의 역사
• Special Lecture, Jeonju Univ., Jeonju, Korea, Nov 11, 2025
  수학자가 보는 AI
• Topology & Data: AJOU Graduate Summer School #tda, Ajou Univ., Suwon, Korea, Jul 14-16, 2025
  TDA : topological data analysis

2024

• Special Lecture, Gacheon Univ., Seongnam, Korea, May 28, 2024
  미래사회의 변화와 신기술의 이해

2023

• Special Lecture, Ajou Univ., Suwon, Korea, Aug 2, 2023
  교사를 위한 수학과 대중문화
• 과학영재교육원 특강, Yonsei Univ., Seoul, Korea, Jul 25, 2023
  수학 문제 도전의 즐거움
• Special Lecture, 국립중앙과학관, Daejeon, Korea, Jul 22, 2023
  위상수학, 넌 누구니?
• 과학영재교육원 특강, Ajou Univ., Suwon, Korea, Mar 17, 2023
  수학자 관점으로 읽기

2014

• Brown Bag Lectures at Ajou Univ., Ajou Univ., Suwon, Korea, Sep 16, 2014

2012

• 조선대학교 수학교육과 특강, Chosun Univ., Gwangju, Korea, Jun 21, 2012
  Catalan numbers and associahedra