Dec. 2007 - Feb. 2008 		National Taiwan University (Visiting Scholar)
    Feb. 2003 - Feb. 2004 		Wayne State University (Visiting Scholar)
    Jul. 1995 - Jul. 1996   		Carleton University (Post-doc)
    Jun. 1994 - Aug. 1994 		Purdue University (Visiting Scholar)
    Aug. 1990  					Yonsei University (Ph.D.)
     
        

   
    Feb. 1989 - Present              	Professor, Chungbuk National University
    Mar. 1986 - Feb. 1989           	Lecturer, Yonsei University
    
        

    Aug. 20-24, 2023		IFSA 2023 World Congress, Advisory Committee
    Jan. 01-Dec. 31, 2011 	12th International Symposium of Advanced Intelligent Systems, General Chair
    Jan. 01-Dec. 31, 2009 	FUZZ-IEEE 2009, Local Committee Chair
    Aug. 24-25, 2001		The Second International Workshop on Advanced Intelligent Systems, Program Committee
    Aug. 21, 2000    			The International Workshop on Advanced Intelligent Systems, Organization Chair
    June 18-21, 1998		The 3rd Asian Fuzzy Symposium, International Program Committee
    July 2-7, 1993    			The Fifth IFSA World Congress, Secretariate Staff Chair
       	
        

1. Y. S. Eom, S. M. Yun, and S. J. Lee, "Four types of generalized fuzzy continuous mappings," Int. J. Fuzzy Log. Intell. Syst., vol. 23, no. 3, pp. 303-310, 2023.
2. S. M. Yun, Y. S. Eom, and S. J. Lee, "Topology of the redefined intuitionistic fuzzy rough sets," Int. J. Fuzzy Log. Intell. Syst., vol. 21, no. 4, pp. 369-377, 2021.
3. S. M. Yun and S. J. Lee, "New approach to intuitionistic fuzzy rough sets," Int. J. Fuzzy Log. Intell. Syst., vol. 20, no. 2, pp. 129-137, 2020.
4. J. T. Kim and S. J. Lee, "Pairwise precontinuity in intuitionistic smooth bitopological spaces," Int. J. Fuzzy Log. Intell. Syst., vol. 19, no. 3, pp. 204-212, 2019.
5. Y. C. Kim, A. A. Ramadan, and S. J. Lee, "Categories of Alexandrov l-fuzzy pre-uniformities, l-approximation operators and Alexandrov l-fuzzy topologies," Int. J. Fuzzy Log. Intell. Syst., vol. 19, no. 1, pp. 28-39, 2019.
6. S. M. Yun and S. J. Lee, "Intuitionistic fuzzy topologies induced by intuitionistic fuzzy approximation spaces," Int. J. of Fuzzy Systems, vol. 19, no. 2, pp. 285-291, 2017.
7. S. M. Yun and S. J. Lee, “Intuitionistic fuzzy rough approximation operators,” Int. J. Fuzzy Log. Intell. Syst., vol. 15, no. 3, pp. 208–215, 2015.
8. S. J. Lee and S. M. Yun, "Fuzzy δ-topology and compactness," Commun. Korean Math. Soc., vol. 27, no. 2, pp. 357-368, 2012.
9. S. J. Lee and J. T. Kim, "Fuzzy strongly (r,s)-pre-open and pre-closed mappings," Commun. Korean Math. Soc., vol. 26, no. 4, pp. 661-667, 2011.
10. S. J. Lee and S. M. Yun, "Fuzzy delta separation axioms," IEEE International Conference on Fuzzy Systems, vol. 2011, pp. 595-602, 2011.
11. S. J. Lee and Y. S. Eoum, "Intuitionistic fuzzy θ-closure and θ-interior," Commun. Korean Math. Soc., vol. 25, no. 2, pp. 273-282, 2010.
12. S. J. Lee and J. M. Chu, "Categorical property of intuitionistic topological spaces," Commun. Korean Math. Soc., vol. 24, no. 4, pp. 595-603, 2009.
13. S. J. Lee and E. P. Lee, “Intuitionistic fuzzy proximity spaces,” Int. J. Math. Math. Sci., vol. 2004, no. 49, pp. 2617–2628, 2004.
14. S. J. Lee and E. P. Lee, “Fuzzy strongly r-semicontinuous maps,” Commun. Korean Math. Soc., vol. 18, no. 2, pp. 341–353, 2003.
15. S. J. Lee and E. P. Lee, “Fuzzy r-regular open sets and fuzzy almost r-continuous maps,” Bull. Korean Math. Soc., vol. 39, no. 3, pp. 441–453, 2002.
16. S. J. Lee and E. P. Lee, “Fuzzy r-continuous and fuzzy r-semicontinuous maps,” Int. J. Math. Math. Sci., vol. 27, no. 1, pp. 53–63, 2001.
17. S. J. Lee and E. P. Lee, “The category of intuitionistic fuzzy topological spaces,” Bull. Korean Math. Soc., vol. 37, no. 1, pp. 63–76, 2000.
18. S. J. Lee and E. P. Lee, “Fuzzy r-preopen sets and fuzzy r-precontinuous maps,” Bull. Korean Math. Soc., vol. 36, no. 1, pp. 91–108, 1999.
19. S. J. Lee and K. C. Min, “An isomorphism for infinite dimensional calculus,” Commun. Korean Math. Soc., vol. 13, no. 3, pp. 475–480, 1998.
20. S. J. Lee and L. D. Nel, “Foundational isomorphisms in continuous differentiation theory,” Appl. Categ. Structures, vol. 6, no. 1, pp. 127–135, 1998.
21. S. J. Lee, E. S. Park, and E. P. Lee, “A generalization of a lattice fuzzy topology,” Commun. Korean Math. Soc., vol. 12, no. 1, pp. 113–126, 1997.
22. D. I. Rim, J. H. Yun, and S. J. Lee, “On the m-solution of the first kind equations,” Commun. Korean Math. Soc., vol. 10, no. 1, pp. 235–249, 1995.
23. K. C. Min, J. W. Park, and S. J. Lee, “Fibrewise convergence,” Commun. Korean Math. Soc., vol. 8, no. 2, pp. 335–344, 1993.

• Full list