Not only Choe Yong-gon is gone, it looks as if http://www.kcna.co.jp/index-e.htm is down now http://downforeveryoneorjustme.com/http://www.kcna.co.jp
Perhaps the have stopped using the server in Japan and migrated to http://www.kcna.kp/kcna.user.home.retrieveHomeInfoList.kcmsf?lang=eng