A visitor is reflected on a Korea National Oil Corp (KNOC) logo on a commuter bus as she walks across a parking lot at KNOC's headquarters in Anyang, southwest of Seoul in this September 8, 2010 file photo. KNOC said it had control of 64 percent of British oil explorer Dana Petroleum, paving the way for the biggest hostile acquisition by a South Korean firm to take place. Picture taken September 8, 2010. REUTERS/Jo Yong-Hak/Files (SOUTH KOREA - Tags: BUSINESS ENERGY)