서울대 작용소 세미나 1994 May 27: 박춘길(Univ. of Maryland); The Bundle Struture of Noncommutative Tori 1994 Jun 3: 박춘길(Univ. of Maryland); An Introduction to Non-Commutative Differential Geometry 1994 Jun 10: 박춘길(Univ. of Maryland); An Introduction to Non-Commutative Differential Geometry II 1995 Dec 8: 박춘길(Univ. of Maryland); The structure of tensor products of non-commutative tori with UHF-algebra and Cuntz algebra 1995 Dec 28: 박춘길(Univ. of Maryland); Twisted group C*-algebras and non-commutative tori, I 1995 Dec 29: 박춘길(Univ. of Maryland); Twisted group C*-algebras and non-commutative tori, II 1996 Jan 5: 박춘길(Univ. of Maryland); Twisted group C*-algebras and non-commutative tori, III 1996 Apr 12: 박춘길(서울대); Strong Morita equivalence for non-commutative tori 1996 Apr 19: 박춘길(서울대); Principal PU(k)-bundles over compact manifolds 1996 May 17: 박춘길(서울대); $k$-homogeneous C*-algebras over compact manifolds 1997 Apr 4: 박춘길(충남대); The Solar System Algebras 1997 Dec 5: 박춘길(충남대); Stable Isomorphism of Spherical Non-Commutative Tori 2003 May 23: 박춘길(충남대); Linear Operators in C*-Algebras 2005 Dec 2: 박춘길(충남대); Isometric isomorphisms between quasi-Banach algebras 2006 Nov 3: 박춘길(한양대); Isomorphisms and Derivations in C*-algebras 2007 Nov 2: 박춘길(한양대); Functional Equations의 분류