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INFORMATION SYSTEMS (postech rank 1), vol. 32, no. 4, page. 575 - 592, 2007-06
ETRI JOURNAL, vol. 29, no. 2, page. 179 - 188, 2007-04
INFORMATION PROCESSING & MANAGEMENT (postech rank 1), vol. 43, no. 2, page. 393 - 405, 2007-03
INFORMATION PROCESSING & MANAGEMENT (postech rank 1), vol. 43, no. 2, page. 297 - 301, 2007-03