1. School of Information and Communication Engineering, Chungbuk National University, 1 Chungdaero, Seowon-gu, Cheongju 362-763, Republic of Korea
2. LOTTE Engineering & Construction IS Team, LOTTE Data Communication Co., Saerom B/D, No. 18-1, Jamwon-dong, Seocho-gu, Seoul 137-903, Republic of Korea
3. Agency for Defense Development, Bugyuseong-daero 488, Yuseong, Daejeon 305-600, Republic of Korea