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Journal of Information Science : Database vol 18 No.4, pp23-35
Bong-gi Jun, Duk-sung Lim, Bong-hee Hong

Journal of Information Science : Database vol 29  No.4 pp321~333
Sungwoo Ahn, Youngduk Seo, Jindeog Kim, Bonghee Hong

Journal of Information Science : Database vol 18 No.1  pp 41-52
Seo Young Duk, An Kyoung Hwan, Hong Bong Hee