### 서승현(徐承鉉)

 Associate Professor         Department of Mathematics Education     1 KNU-Ave, Chuncheon, 200-701 Korea    Tel: +82-33-250-6721     Fax: +82-33-259-5599     E-mail: shyunseo (AT) kangwon (dot) ac (dot) krTeaching: 2015 springTopology 1Topics in algebraDiscrete MathematicsResearch AreaEnumerative CombinatoricsAlgebraic CombinatoricsEducation 2004,  Ph. D.  Dept. of Mathematics, KAIST  (advisor: Dongsu Kim) 1998,  M. S.   Dept. of Mathematics, KAIST 1996,  B. S.    Dept. of Mathematics Education, Seoul National University Employment2012-present, Associate Professor, Department of Mathematics Education, Kangwon National University2008-2012, Assistant Professor, Department of Mathematics Education, Kangwon National University2007-2008, Lecturer,  Department of Mathematics Education, Cheongju University 2005-2007, Instructor, Department of Mathematics, Seoul National UniversityVisiting Position2004-2005, Visiting Scholar, Department of Mathematics, Brandeis University (mentor: Ira Gessel)PublicationsSigned 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.