**Yonghwa Cho**

I am currently a research fellow(PostDoc) at...

School of Mathematics

KIAS(Korea Institute for Advanced Study)

85 Hoegiro Dongdaemun-gu

Seoul 02455

Republic of Korea

E-mail: yhch088_AT_kias.re.kr

(replace "0" by the english alphabet "o", and "_AT_" by "@")

Last revised/verified : Jul 28, 2020

**Research Papers**

- On derived categories of algebraic surfaces consturcted via $\mathbb{Q}$-Gorenstein smoothings, PhD Thesis, Korea Advanced Institute of Science and Technology, 2017.
- (w/ Yongnam Lee) Exceptional collections on Dolgachev surfaces associated with degenerations, Adv. Math. 324 (2018). (journal) (arXiv:1506.05213v4) (Macaulay2 Scripts)
- (w/ Federico Caucci, Luca Rizzi) On dominant rational maps from a very general complete intersection surface in P^4, Le Matematiche 72, no. 2 (2017). (journal)
- On derived categories of nonminimal Enriques surfaces, preprint. (arXiv:1612.09406) (Macaulay2 Scripts)
- (w/ Yeongrak Kim, Kyoung-Seog Lee) Ulrich bundles on intersections of two 4-dimensional quadrics, to appear in IMRN. (journal) (arXiv:1704.03352)
- Orthogonal exceptional collections from $\mathbb{Q}$-Gorenstein degeneration of surfaces. (arXiv:2005.09884)

**Seminar & Conference Talks**

- Degenerations and exceptional collections in del Pezzo surfaces,
*2020 KMS Spring Meeting*, Jul 3, 2020 - Degeneration of del Pezzo surfaces: a categorical viewpoint,
*2019 Symposium in Algebraic Geometry*, Busan, Dec 22–24, 2019. - Singularities of class T and orthogonal collections,
*2019 Pohang Mathematics Workshop*, Jeju, Dec 5–8, 2019. - Toric systems and toric degenerations, Sungkyunkwan University, Dec 4, 2019.
- Derived categories and Ulrich bundles on Fano threefolds,
*Tokyo-Seoul Conference in Mathematics 2019 - Algebraic Geometry*, University of Tokyo, Nov 29–30, 2019. - Ulrich bundles on intersection of two 4-dimensional quadrics,
*Inaugural France-Korea Conference on Algebraic Geometry, Number Theory, and Partial Differential Equations*, University of Bordeaux, Nov 24–27, 2019. - Ulrich bundles and their moduli spaces,
*Challenging Algebraic Geometry Workshop*, Gangneung, Nov 6–9, 2019. - Orthogonal collections from Q-Gorenstein degeneration,
*KMS Annual Meeting*, Hongik University, Oct 25–27, 2019. - Exceptional collections and toric surfaces, KIAS seminar, Oct 16, 2019.
- Toric systems, mutations and MMP,
*KAIX thematic program: Intensive lecture series on Algebraic Geometry*, KAIST, Aug 19–23, 2019. - Del Pezzo surfaces: toric systems, degenerations, and minimal model program, IBS-CGP seminar, Jul 16, 2019.
- Exceptional collections arising from toric degenerations of del Pezzo surfaces,
*Algebraic and Symplectic Aspects in Degenerations of Complex Surfaces*, KIAS, Jun 24–28, 2019. - Toric systems and degeneration of del Pezzo surfaces,
*Sinchon Workshop on Algebraic Geometry*, Yonsei University, Jun 21, 2019. - Toric systems on rational surfaces, Ajou University, May 28, 2019.
- Exceptional collections and toric degenerations of del Pezzo surfaces, Seoul National University, Apr 23, 2019.
- Three block collections and $\Q$-Gorenstein degenerations of del Pezzo surfaces, Algebraic geometry seminar, KAIST, Apr 25, 2018.
- Exceptional bundles and $\mathbb Q$-Gorenstein degeneration of surfaces, Oberseminar, Leibniz Universität Hannover, Feb 23, 2018.
- Exceptional blocks and $\mathbb Q$-Gorenstein degeneration of surfaces, Algebraic geometry seminar, KAIST, Jan 3, 2018.
- Categorical approach to the Ulrich bundles on Fano threefolds, Algebraic geometry seminar, KAIST, Dec 28, 2017.
- Ulrich bundles on prime Fano threefolds of index 2 and degree 4, Bielefeld Arithmetic Geometry Seminar, Universität Bielefeld, May 24, 2017.
- Exceptional collections on algebraic surfaces,
*Shinchon Workshop on Algebraic Geometry 2*, Yonsei University, Feb 27-28, 2017 - Nonminimal surfaces admitting exceptional collections,
*Symposium in Algebraic Geometry*, Busan, Dec 26-27, 2016 - Divisors on Dolgachev surfaces, IBS-CGP Seminar, Sep 27, 2016
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*Contributed Talk*) Line bundles on surfaces associated with degenerations,*Workshop on algebraic surfaces and moduli*, KAIST, Apr 11-15, 2016 - Establishing exceptional collections of maximal length on Dolgachev surfaces using deformation theory,
*Workshop on Deformation and Moduli*, Busan, Jan 20-23, 2016 - Line bundles on Lee-Park surfaces and applications to the study of derived categories I-III, Algebraic Geometry Seminar, KIAS, Dec 1-3, 2015
- Exceptional collection of maximal length on an algebraic surface with Kodaira dimension 1, ASARC Seminar, KAIST, Nov 10, 2015
- Line bundles on Dolgachev surfaces constructed via $\mathbb Q$-Gorenstein smoothing,
*Mini-workshop on Algebraic Surfaces*, KIAS, Oct 15-16, 2015 - Cone of curves on algebraic varieties, After School on Minimal Model Program, KIAS, Apr 27-29, 2015
- Exceptional vector bundles on Dolgachev surfaces constructed via $\mathbb Q$-Gorenstein smoothing,
*KMS Spring Meeting*, Apr 25, 2015 - Deformation theory of algebras, Algebra Seminar, KIAS, Feb 3, 2015