The logo of Korea National Oil Corp (KNOC) is seen on its commute bus in a parking lot at KNOC's headquarters in Anyang, southwest of Seoul September 8, 2010. Dana Petroleum rejected a hostile 1.67 billion pound ($2.57 billion) bid from KNOC on Wednesday, citing an independent valuation that said the UK explorer was worth considerably more. REUTERS/Jo Yong-Hak (SOUTH KOREA - Tags: BUSINESS ENERGY)