INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS, vol. 5, no. 1, page. 70 - 78, 2007-02
유아특수교육연구, vol. 7, no. 3, page. 141 - 164, 2007-01
OCEAN SCIENCE JOURNAL, vol. 42, no. 2, page. 129 - 134, 2007-06
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