United Nations Secretary-General Ban Ki-moon (L) and Duksung Women's University's President Chi Eun-hee hold shovels after planting a commemorative tree at the university in Seoul August 13, 2012. Ban arrived in South Korea last Saturday for a four-day visit to attend an international maritime conference and the closing ceremony for the World Expo in Yeosu. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: POLITICS EDUCATION)