JONGMOON, SHIN
ADEPARTMENT OF MATHEMATICS EDUCATION, DONGGUK UNIVERSITY, GYEONGJU 780-714, KOREAEmail address:shinjm@dongguk.ac.kr
CHAEHOON, CHANG
INFORMATION TECHNOLOGY MANPOWER DEVELOPMENT PROGRAM, KYUNGPOOK NATIONAL UNIVERSITY, TAEGU 702-701, KOREAEmail address:yamaguchi21@hanmail.net