Teaching: 2020 Spring
- Topology 1
- Topics in topology
- 2008-2017, Assistant/Associate Professor, Department of Mathematics Education, Kangwon National University
- 2007-2008, Lecturer, Department of Mathematics Education, Cheongju University
- 2005-2007, Instructor, Department of Mathematics, Seoul National University
- Singular overpartitions and partitions with prescribed hook differences (with Ae Ja Yee), Annals of Combinatorics 23(2019), 1039-1072.
- Refined enumeration of vertices among all rooted ordered d-trees (with Sangwook Kim and Heesung Shin), Bulletin of Korean Mathematical Society 56(4) (2019), 899-910.
- Enumeration of partitions with prescribed successive rank parity blocks (with Ae Ja Yee), Journal of Combinatorial Theory, series A 158(2018), 12-35.
- Overpartitions and singular overpartitions (with Ae Ja Yee), In: Andrews G., Garvan F. (eds) Analytic Number Theory, Modular Forms and q-Hypergeometric Series. ALLADI60 2016. Springer Proceedings in Mathematics & Statistics, vol 221. Springer, Cham, (2017), 693-711.
- Enumerations of vertices among all rooted ordered trees with levels and degrees (with Sen-Peng Eu and Heesung Shin), Discrete Mathematics 340(9) (2017), 2123-2129.
- Colored permutations with no monochromatic cycles (with Dongsu Kim and Jang Soo Kim), Journal of Korean Mathematical Society 54(4) (2017), 1149-1161.
- The Catalan threshold arrangement, Journal of Integer Sequences 20(1) (2017), Article 17.1.1.
- Combinatorial enumeration of the regions of some linear arrangements, Bulletin of Korean Mathematical Society 53(5) (2016), 1281-1289.
- Signed a-polynomials of graphs and Poincaré polynomials of real toric manifolds (with Heesung Shin), Bulletin of Korean Mathematical Society 52(2) (2015), 467-481.
- Annular noncrossing permutations and minimal transitive factorizations (with Jang Soo Kim and Heesung Shin), Journal of Combinatorial Theory, series A 124(2014), 251-262.
- Shi-threshold arrangements, Electronic Journal of Combinatorics 19(3) (2012), P39.
- Enumeration of 0/1-matrices avoiding some 2x2 matrices (with Hyeong-Kwan Ju), Discrete Mathematics 312(16) (2012), 2473-2481.
- A refinement for ordered labeled trees (with Heesung Shin), Korean Journal of Mathematics 20(2) (2012), 255-261.
- On the enumeration of rooted trees with fixed size of maximal decreasing trees (with Heesung Shin), Discrete Mathematics 312(2) (2012), 419-426.
- Combinatorial proofs of inverse relations and log-concavity for Bessel numbers (with Hyuk Han), European Journal of Combinatorics 29(2008), 1544-1554.
- A Generalized enumeration of labeled trees and reverse Prüfer algorithm (with Heesung Shin), Journal of Combinatorial Theory, series A 114 (2007), 1357-1361.
- An efficient top-down search algorithm for learning Boolean networks of gene expression (with Dougu Nam, Sangsoo Kim), Machine Learning 65(1) (2006), 229-245.
- A refinement of Cayley's formula for trees (with Ira Gessel), Electronic Journal of Combinatorics 11(2) (2006), R27.
- A combinatorial proof of Postnikov's identity and a generalized enumeration of labeled trees, Electronic Journal of Combinatorics 11(2) (2005), N3.
- Colored Prüfer codes for k-edge colored trees (with Manwon Cho et al), Electronic Journal of Combinatorics 11(1) (2004), N10.
- Transitive cycle factorizations and prime parking functions (with Dongsu Kim), Journal of Combinatorial Theory, series A 104 (2003), 125-135.