Seoul National University Hospital residency(1991-94)
Seoul National University Hospital fellowship(1995-96)
Ewha Women's University Mok-Dong hospital instructor(1996-1998)
Ewha Women's Unviersity Mok-Dong hospital assistant professor(1998- )
Cryopreservation of the cardiac valves and trachea
Heart Transplantation
Mechanical support(TAH, VAD) for failing heart