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

   
    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
       	
        

• 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.
• 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.
• 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.
• 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.
• 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.
• S. J. Lee and J. T. Kim, "Continuous mappings in intuitionistic fuzzy bitopological spaces," Far East Journal of Mathematical Sciences, vol. 100, no. 7, pp. 1119-1140, 2016.
• 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.
• J. T. Kim and S. J. Lee, "Intuitionistic smooth bitopological spaces and continuity," Int. J. Fuzzy Log. Intell. Syst., vol. 14, no. 1, pp. 49-56, 2014.
• S. J. Lee and S. M. Yun, "Fuzzy ¥ä-topology and compactness," Commun. Korean Math. Soc., vol. 27, no. 2, pp. 357-368, 2012.
• 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.
• S. J. Lee and S. M. Yun, "Fuzzy delta separation axioms," IEEE International Conference on Fuzzy Systems, vol. 2011, pp. 595-602, 2011.
• S. J. Lee and Y. S. Eoum, "Intuitionistic fuzzy ¥è-closure and ¥è-interior," Commun. Korean Math. Soc., vol. 25, no. 2, pp. 273-282, 2010.
• 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.