2007. 12. - 2008. 2.		국립대만대학교 (방문교수)
2003. 2. - 2004. 2. 		Wayne State University (방문교수)
1995. 7. - 1996. 7. 		Carleton University (Post-doc)
1994. 6. - 1994. 8. 		Purdue University (방문교수)
1990. 8.   			연세대학교 (이학박사)
     

 
1989. 2. - 현재	    	충북대학교 교수
1986. 3. - 1989. 2. 		연세대학교 강사

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.

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