서울대 작용소 세미나 2004 Nov 5: 박상수(이화여대); Non-subnormal and polynomially hyponormal operators 2005 May 13: 박상수(이화여대); Joint spectral radius and wavelet functions 2005 Sep 30: 박상수(이화여대); Subnormality and hypercontractivity 2006 Apr 28: 박상수(이화여대); On n-contractive weighted shift