Recent Invited Talks

• Math colloquium, GIST, 2025.9.5, "수학의 통일성". 

• 2025 Algebraic Geometry Conference in Jeonju, 2025.6.12, "Generalized sheaf counting."

• Mini-workshop on moduli spaces and related topics, 2025.5.26, "Generalized sheaf counting 1,2."

• Seminaire Fables geometriques, Geneva, 2025.4.2, "Generalized sheaf counting." 

• Lie Groups and Moduli Spaces Seminar, Geneva, 2025.4.1, "Birational geometry of generalized Hessenberg varieties and the Shareshian-Wachs conjecture."

• HCMC 대중강연, 2025.3.15, "다항식 길들이기."

• 2024 KIAS-APCTP Frontiers of Theoretical Physics, Jeju, 2024.11.25, "Derived enumerative geometry."

• Conference on recent progress in algebraic geometry, Gangneung, 2024.11.5, "Gromov-Witten invariants for branched covers."  

• G-BRL Number Theory Seminar, Chonnam University, 2024.11.1, "Enumerative geometry of points, curves and surfaces."

• Mini-workshop on shifted symplectic structures and enumerative geometry, Postech, 2024.10.28~29, "Symplectic transitions from classical to derived geometry 1,2."

• Math colloquium, Korea University, 2024.10.11, "Enumerative geometry of points, curves and surfaces."

• HCMC colloquium, KIAS, 2024.10.10, "Enumerative geometry of points, curves and surfaces."

• 2024 Seoul-Taipei Enumerative Geometry, Busan, 2024.10.1, "Generalized sheaf counting." 

• 2024 BICMR-IBSCGP Conference on Gromov-Witten theory and related topics, Jeju, 2024.8.30, "Gromov-Witten invariants of  branched covers." 

• Suzhou workshop on matroid theory, Soochow University, 2024.7.8, "Birational geometry of generalized Hessenberg varieties and the Shareshian-Wachs conjecture."

• Workshop on Moduli stacks and Enumerative geometry (EMGW05), Isaac Netwon Institute for Mathematical Sciences, Cambridge, UK, 2024.6.17, "Wall crossing for quasimaps and representations of symmetric groups."

• Geometry and analysis seminar, Oxford University,  UK, 2024.6.3, "Shifted Lagrange multipliers method."

• Algebraic geometry seminar, Utrecht University,  the Netherlands, 2024.5.29, "Shifted Lagrange multipliers method."

• Algebraic geometry and number theory seminar, Institute of Science and Technology-Austria,  Vienna, 2024.4.25, "Shifted Lagrange multipliers method."

• Workshop on Enumerative Geometry, SCMS, Shanghai, 2024.3.11, "GLSM revisited."

• Mathematics Colloquium, Postech, 2024.3.8, "Enumerative geometry of curves and surfaces."

• Mathematics Colloquium, UNIST, 2024.3.7, "Enumerative geometry of curves and surfaces."

• Shing-Tung Yau conference, UNIST, 2024.1.11, "Shifted Lagrange multipliers method."

• Enumerative geometry in East Asia, Academia Sinica, Taipei, 2023.12.26, "Cosection localization via shifted symplectic geometry."

• International conference on Gromov-Witten theory, SYSU, Guangzhou, China, 2023.12.18, "On the cohomology of M0n bar."

• iTHEMS Seminar, RIKEN, Japan, 2023.12.6, "Cosection localization via shifted symplectic geometry."

• Conference on Algebraic Geometry in Busan, 2023.11.30, "Recent advances in enumerative geometry of sheaves."

• 서울대 수학강연회, 2023.10.19, "양자상태의 기하학."

• Symplectic singularities and field theory with eight supercharges, UNIST, 2023.10.12-13, "Counting sheaves in algebraic geometry."

• Workshop on moduli, K-stability, Fano varieties and related topics, IBS-CCG, 2023.5.18-19, "Counting surfaces in projective varieties."

• Colloquium, Academia Sinica-Institute of Mathematics, Taipei, 2023.3.23, "Schubert, Hessenberg and Lusztig."

• Algebraic geometry seminar, Academia Sinica-Institute of Mathematics, Taipei, 2023.3.21, "Counting surfaces in projective varieties."

• Conference on Algebraic Geometry in Yangpyeong, 2023.2.22, "Schubert, Hessenberg and Lusztig."

• Combinatorics on flag varieties, Yangyang, 2023.1.31~2.3, "Geometry of Hessenberg varieties", 3 lectures. 

• Algebraic geometry seminar, KIAS, 2022.11.18, "Vector bundles and sheaves in algebraic geometry, from Abel-Jacobi to Donaldson-Thomas."

• 아주대 수학과 콜로퀴엄, 2022.10.27, "채색다항식과 대수기하학." 

• A tribute to the life and work of Professor Bumsig Kim: Categorical and Enumerative Aspects of Mirror Symmetry, 2022.9.22, "Derived cosection localization."

• 광주과기원 초청강연, 2022.9.2, "채색다항식과 대수기하학." 

• Workshop on geometry of moduli spaces, Gangneung, 2022.8.28, "Topological cosection localization."

• Geometry and Physics seminar (online), IAS-Mathematics at Zhejiang University, 2022.4.19, "Representations on the cohomology of the moduli spaces of pointed stable cuves of genus 0."

• Complex geometry seminar, IBS-CCG, 2022.2.10, "A new construction of the moduli space of pointed stable curves of genus 0."

• 천안 대수기하-정수론 겨울학교, 2022.1.71-21, "Moduli spaces of pointed stable curves of genus 0."

• 강릉대수기하학세미나, St.John's Hotel, 2021.12.16, "A new construction of the moduli space of pointed stable curves of genus 0."

• Beijing-Novosibirsk seminar on geometry and mathematical physics, online, 2021.12.2, "A new construction of the moduli space of pointed stable curves of genus 0."

• 전주대 수학교육과 초청강연, 전주대학교, 2021.11.3, "대수 기하의 어제와 오늘."

• Yeongnam algebraic geometry  workshop, Laonzena Hotel Daegu, 2021.10.15, "Algebraic geometry of quantum states."

• Buyeo workshop on algebraic geometry, Lotte Resort Buyeo, 2021.10.2, "Stability of vector bundles via stacks."

• Math colloquium, Sungkyunkwan University, online, 2021.9.9, "Enumerative geometry of vector bundles in algebraic geometry."

• Workshop on quantum analysis, 2021.8.27, Samcheok Sol Beach, "Conformal field theory and algebraic geometry."

• Sokcho workshop on algebraic geometry, Ramada Hotel Sokcho, 2021.7.19~20, "Enumerative geometry of bundles and sheaves 1,2."

• 대한수학회 봄연구발표회 대중강연, online, 2021.4.29, "다항식 - 익숙한 듯 경이로운 벗."

• KIAS expositions, KIAS, "Enumerative geometry before and after string theory", 2021.2.26. 

• Math-String theory seminar, IPMU, online, 2021.1.13, "Localizing virtual cycles for Donaldson-Thomas invariants of Calabi-Yau 4-folds."

• Gongju workshop on algebraic geometry, Hotel Gongju, 2020.11.18, "Localizing virtual cycles for DT4 invariants by cosections." 

• Recent Advances in Moduli and Invariants, online, 2020.9.24, "Cosection localization for everybody." 

• 인공지능과 대학수학, 대한수학회, online, 2020.6.19, "인공지능 시대의 대학수학."

• Math-String theory seminar, IPMU, Tokyo, 2020.2.18, "K-theoretic generalized Donaldson-Thomas invariants."

• Conference on Recent Advances in Mirror Symmetry, TSIMF, Sanya, 2019.12.19, "Towards a Calabi-Yau/Landau-Ginzburg correspondence."

• Workshop on Moduli and Invariants, BIRS-CMO (Oaxaca, Mexico) 2019.11.19, "K-theoretic generalized Donaldson-Thomas invariants."

• Algebraic Geometry International Conference, KIAS, 2019.6.6, "Virtual cobordism classes."

• Mathematical Aspects of Quantum Information Theory, Seoul, 2019.5.24, "Entangled edge states of corank 1 with positive partial transposes."

• Analysis seminar, KIAS, 2019.3.29, "Entangled edge states of corank 1 with positive partial transposes."

• Operator theory seminar, SNU, 2019.3.13, "Entangled edge states of corank 1 with positive partial transposes."

• Workshop on algebraic geometry, UCSD, 2019.1.13, "Cosection localization and quantum singularity theory."

• Workshop on moduli spaces and derived categories, IBS-CGP, 2018.11.29, "Cosection localization and quantum singularity theory."

• Workshop on algebraic geometry, Gunsan, 2018.10.11, "Non-reductive geometric invariant theory and quantum entanglement."

• Workshop on moduli and varieties, Shanghai Center for Mathematical Sciences, 2018.9.20, "Cosection localization and quantum singularity theory."

• Differential, algebraic and topological methods in complex algebraic geometry, Cetraro, Italy, 2018.9.15, "Cosection localization and quantum singularity theory."

• Workshop on higher genus Gromov-Witten invariants, Zhejiang University, Hangzhou, China, 2018.8.23, "Quantum singularity theories via cosection localization."

• COW seminar on algebraic geometry, Oxford University, 2018.8.6, "Cosection localization and quantum singularity theory."

• Algebraic geometry seminar, Sookmyung women's university, 2018.6.18, "Quantum singularity theories via cosection localization."

• CMC seminar, KIAS, 2018.6.14, "Generalized Donaldson-Thomas invariants."

• CMC seminar, KIAS, 2018.5.2, "Quantum singularity theories via cosection localization."

• Simons workshop on homological mirror symmetry, Harvard University, 2018.1.10, "Knorrer periodicity in curve counting."

• Master lectures-Quotients, stability and invariants workshop, Sanya, 2017.12.19, "30 years of partial desingularization."

• Colloquium, KIAS, 2017.12.12, "A brief history of cosection localization."

• Dasan conference of mathematical challenges, 2017.12.1, "Some hard problems in algebraic geometry."

• Lanzhou workshop on mathematics, 2017.8.21, "Localizing virtual structure sheaves by cosections."

• FRG workshop on quasimaps and geometric representation theory, U. of Michigan, 2017.4.22, "Stability conditions on quasimaps and FJRW theory."

• Yeongnam workshop on algebraic geometry, Yeongnam U., 2017.4.15, "On the geometry of Landau-Ginzburg correspondence."

• Algebraic geometry conference, Busan, 2017.3.28, "Intersection theory - old and new."

• Kickoff Symposium: New development of algebraic geometry viewed from theoretical physics, Kyoto, 2017.2.23, "Critical virtual manifolds and Donaldson-Thomas invariants."

• Hong Kong geometry colloquium, HKUST, 2017.2.18, "On the geometry of critical virtual manifolds."

• HKUST seminar on pure mathematics, 2017.2.16, "Stability conditions on linear systems and curve counting invariants."

• Mathematics Inspired by String Theory 2017, CUHK, 2017.2.8, "Gauge theory and invariants in algebraic geometry."

• 5th Conference on moduli and birational geometry, Jeju, 2016.12.16, "Stability conditions on linear systems." 

• 10th Seoul-Hokkaido conference on mathematics, Sapporo, 2016.12.5, "Gauge theory and invariants in algebraic geometry."

• 1st Seoul Seminar on Algebraic Geometry, Yonsei University, Seoul, 2016.9.30, "Gauge theory and invariants in algebraic geometry."

• Second French-Korean conference on mathematics, Bordeaux, 2016.7.4~6, 5 lectures on "Critical virtual manifolds and Donaldson-Thomas invariants."

• Workshop - curves on surfaces and 3-folds, EPF Lausanne, 2016.6.20, "Critical virtual manifolds and Donaldson-Thomas invariants."

• Beijing geometry and physics colloquium, BICMR, Beijing, 2016.4.23: 2 lectures (1) curve counting via sheaf theory, (2) LG/CY correspondence via quasimaps.

• Spring School on Moduli Theory,  Shanghai Mathematics Center, 2016.4.17~21, 3 lectures on derived categories.

• Workshop on Deformation and Moduli, 2016.1.20-23, Busan, 2 lectures on "Deformation of moduli of vector bundles over curves and the Fano visitor problem": (1) Fano visitor problem, (2) Deformation theory of moduli of vector bundles over curves.

• CGP conference on String Field Theory of the B-model, 2016.1.6-9, Pohang, 3 lectures on "Categorification of Donaldson-Thomas invariants": (1) Critical virtual manifolds and perverse sheaves, (2) Gauge theory on Calabi-Yau 3-folds, (3) Gopakumar-Vafa invariant via categorification.

• Hong Kong University of Science and Technology, Algebraic Geometry Seminar: (1) 2015.12.22, "Le Potier stability for quasimaps and wall crossing; (2) 2015.12.24, "Critical virtual manifolds and perverse sheaves."

• ICTS at Bengalore, India, 2015.11.28, "Moduli spaces of sheaves on curves and Calabi-Yau 3-folds."

• KIAS workshop on algebraic geometry, Songnisan, 2015.11.12, "Critical virtual manifolds and perverse sheaves."

• Shanghai Center for Mathematical Sciences seminar, 2015.8.27, "On the Fano visitor problem."

• Summer School on Algebraic Geometry, Anmyundo, 2015.8.20, "Landau-Ginzburg/Calabi-Yau correspondence."

• International Workshop on Algebraic Geometry, Changchun, 2015.8.12, "Derived categories of irreducible symplectic varieties."

• INdAM Italian-Korean Meeting on Algebraic Geometry, Palazzone di Cortona, 2015.7.1, "On the Fano visitor problem."

• Workshop on non-abelian gauged linear sigma model and geometric representation theory, BICMR (Peking University), 2015.6.4, "Le Potier's stability for quasimaps and wall crossing."

• Algebraic geometry seminar, KAIST, 2015.5.15, "On the Fano visitor problem."

• SNU-Bielefeld joint workshop, 2015.2.27, "Landau-Ginzburg/Calabi-Yau correspondence via quasi-maps."

• Recent trends and challenging problems, KIAS, 2014.12.5, "Problems on moduli and invariants."

• Math Colloquium, Yonsei University, 2014.11.27, "Lines, conics and twisted cubics on Fano varieties."

• Math Colloquium, Postech, 2014.11.14, "Lines, conics and twisted cubics in Fano varieties."

• Algebraic geometry workshop, Pukyong University, 2014.8.22, "Lines, conics and twisted cubics in Fano 3-folds."

• ICM satellite conference on algebraic geometry, Daejeon, 2014.8.7, "Gopakumar-Vafa invariant and perverse sheaves."

• Geometry and Physics of Gauged Linear Sigma Model and its related topics, KIAS, 2014.7.29,"Cosection localized virtual fundamental classes."

• CGP seminar, Pohang, 2014.7.14, "Gopakumar-Vafa invariant and perverse sheaves."

• Summer school on algebraic geometry, Damyang, 2014.6.16~20, "Donaldson-Thomas invariants and categorification."

• Landau-Ginzburg theory and Fano varieties Gyeongju, 2014.5.28, "Cosection localization of virtual fundamental classes."

• Plenary talk, KMS spring meeting, 2014.4.25, "Categorification of Donaldson-Thomas invariants by perverse sheaves."

• Math Colloquium, Seoul National University, 2014.4.10, "Categorification of Donaldson-Thomas invariants."

• Math Colloquium, Ewha University, 2013.9.26, "Categorified Donaldson-Thomas invariants."

• Pacific Rim Conference Mathematics, Sapporo, 2013.7.5, "Categorification of Donaldson-Thomas invariants."

• Mathematics Colloquium, University of Central Florida, 2013.4.4, "Algebraic geometry and quantum entanglement."

• Algebraic Geometry seminar, University of Illinois at Urbana-Champaign, 2013.3.12,"Gopakumar-Vafa invariants and perverse sheaves."

• Workshop on moduli and birational geometry, Busan, 2012.7.9, “Hilbert scheme of curves and Seiberg-Witten invariant."

• Algebraic Geometry seminar, 2011.12.28,HKUST, "Moduli spaces of quasi-maps with perfect obstruction theories."

• Fudan-Sogang-Warwick workshop on algebraic geometry, Guiyang China, 2011.8.8, “Poincare invariants are Seiberg-Witten invariants.”

• Conference in honor of David Giesekers 67th birthday on Moduli and Stability, Hangzhou China, 2011.7.20, “Moduli spaces of quasi-maps with perfect obstruction theories.”

• Workshop on moduli and birational geometry, Gyeongju, 2011.7.11, “Wall crossing of moduli spaces and invariants."

• Math Colloquium, Hangyang University, 2011.4.29, “곡선의 정의란 무엇인가?”

• Workshop on Computational Aspects of Birational Geometry, NIMS, 2011.3.29, "Moduli spaces of quasi-maps to projective space with perfect obstruction theories."

• MOS seminar, Newton Institute of Math. Sci., Cambridge, 2011.1.25, "Kirwan blow-ups and moduli spaces."

• Math Colloquium, Seoul National University, 2010.12.2, “곡선의 정의에 관하여."

• Waseda symposium on algebraic geometry, 2010.11.10~13,Waseda University, “Birational geometry of moduli spaces of curves.”

• KMS meeting, 2010.10.22, Postech , “Localization of virtual cycles by cosections.”

• Workshop on moduli and birational geometry, 2010.8.5~8, Postech , “Compactified moduli spaces of curves in projective varieties.”

• NIMS workshop on Invariant Theory and Related Topics, 2010.2.17~19, Inha University, “Elementary construction of moduli spaces of pointed stable curves.”

• KMS-AMS joint meeting, Ewha University, 2009.12.19, Moduli spaces of rational curves in projective space.”

• RIMS Conference on higher dimensional algebraic geometry, 2009.12.15, RIMS-Kyoto, Japan, “On the birational geometry of moduli spaces of rational curves in projective space.”

• Math Colloquium, Postech , 2009.11.27, “Rational curves in projective spaces.”

• WCU inauguration workshop, Sogang University, 2009.7.17, “Twisted cubic curves.”

• Algebraic Geometry seminar, Fudan University, 2009.6.17, “On the birational geometry of moduli spaces of rational curves in projective space.”

• 1st East Asia Symplectic Conference, Academia Sinica , Taiwan, 2009.5.6-5.10, “On the cohomolgy of hyperkahler quotients.”

• Mathematics Colloquium, Seoul National University, 2009.4.23, “Moduli and Quotients."

• Algebraic Geometry Seminar, Oxford University, 2009.2.10, “Moduli theoretic compactifications of the space of smooth rational curves."

• NIMS-SNU Algebra Camp, Solbeach resort, 2009.2.4~2.5, “Introduction to quiver varieties.”

• Workshop on moduli spaces, Sogang University, 2009.1.7, “ Moduli theoretic compactifications of the space of smooth rational curves.”

• Math Colloquium, KAIST, 2008.12.5, “Enumerative geometry and moduli spaces.”

• Algebraic Geometry in East Asia, KIAS, 2008.11.11~11.15, “Hilbert scheme of twisted cubics via stable maps.”

• Gromov-Witten theory and related topics, KIAS, 2008.6.9~6.13, “ Moduli theoretic compactifications of the space of twisted cubics .”

• 2nd NIMS symposium on algebraic geometry, National Institute of Mathematics, 2008.5.12~5.15, “ Moduli theoretic compactifications of the space of twisted cubics .”

• Mathematics Colloquium, 2008.4.30, Inha University, “히로나카의 특이점 해소정리에 대하여.”

• Workshop on equivariant combinatorics , 2008.2.27~28, Ajou University, “Introduction to equivariant cohomology theory.”

• Kyoto-SNU joint symposium, 2008.2. 11, Kyoto RIMS, “ Gromov-Witten invariants of varieties with holomorphic 2-forms.”

• Workshop on moduli spaces, 2007.12.28, Sogang University, “Cohomology of moduli spaces of stable maps to projective space."

• Algebraic Geometry and Commutative Algebra in Tokyo, 2007.12.10, Tokyo University,“ Gromov-Witten invariants of varieties with holomorphic 2-forms."

• Workshop on Curve theory, 2007.11.24, Yeungnam University, “Hilbert scheme of curves in projective space via Kontsevich moduli space.”

• Mathematics Colloquium, 2007.11.1, Ewha University, “대수기하학에서 세는 문제에 관하여."

• Complex and algebraic geometry seminar, 2007.9.14, Osaka University, Japan, “Moduli space of stable maps to projective space via GIT.”

• SNU-Orsay joint symposium, 2007.8.29, Orsay (Univ. Paris-sud ), France, “Moduli spaces of stable maps to Fano manifolds."

• Pacific Rim Complex Geometry Conference, 2007.8.10, Kobe, Japan, “Moduli spaces of stable maps to some Fano manifolds."

• SNU-Hokkaido joint symposium, 2007.2.22, Sapporo, “Gromov-Witten invariants of varieties with holomorphic two-forms."

• Winter school on holomorphic symplectic geometry, 2007.2.5, PyongChang , “Holomorphic Symplectic Quotients.”

• Mathematics Colloquium, 2006.11.16, Yonsei University, “Enumerative geometry and Gromov -Witten theory.”

• Mathematics Colloquium, 2006.9.28, Hanyang University, “Enumerative geometry and intersection theory on moduli spaces."

• Algebraic Geometry Seminar, 2006. 2.10, Stanford University, “ Hecke correspondence, stable maps and Kirwan’s partial desingularization .”

• Algebraic Geometry Seminar, 2006. 1.30, University of Oxford, “Hecke correspondence, stable maps and partial desingularization."

• Algebraic Geometry Progress Seminar, 2005. 11. 3, Stanford University, OGrady's work on irreducible symplectic varieties.”

• AMS Summer Institute on Algebraic Geometry, Seattle, 2005.7.28, "Desingularizations of moduli spaces of rank 2 sheaves with trivial determinant."

• Vector Bundles over Algebraic Curves, KIAS workshop (organized by J.-M. Hwang and S. Ramanan ), 2005.4.14, "Desingularizations of the moduli space of rank 2 vector bundles."

• KAIST Symposium on Algebraic Geometry and Number Theory, 2005.2.4, "Remarks on hyperkahler geometry."

<I lost track of my talks before 2005.>