Most foreigners who want to visit Korea just for a short-term tour or transit are permitted to enter Korea with no visa according to the principles of reciprocity or priority of national interest with a tourist/transit visa status (B-2, 30 days).   http://english.tour2korea.com/coming/essential/entry.asp   Participants requiring an official Letter of Invitation in order to obtain a visa and authorization to attend IEEE ISPLC 2008 should contact the Secretariat before January 10, 2008. This letter is NOT a commitment on the part of ISPLC 2008 organizers to provide financial assistance to any participant or accompanying persons. Expenses incurred are the sole responsibility of the participant.