A payment & receipt business model in U-commerce environment. - Kyoung Jun Lee; Jeong-In Ju; Jeong Mu Jeong (ICEC, 2006)

Seamlessness and Privacy Enhanced Ubiquitous Payment. - Kyoung Jun Lee; Mu Jeong Jeong; Jeong-In Ju (EC-Web, 2006)

Ubiquitous Commerce Business Models Based on Ubiquitous Media. - Kyoung Jun Lee; Jeong-In Ju (BIS, 2007)

Incentive-Based and Peer-Oriented Design of Ubiquitous Commerce. - Kyoung Jun Lee; Jeong-In Ju (ICEIS (3), 2007)

Ubiquitous Business Model by Seamless Integration of Photo and Location Information. - Jeong-In Ju; Jong Chul Lee; Kyoung Jun Lee (APSCC, 2008)