1. Hankuk Aviation University, 200-1 Hwajon-Dung, Koyang, Kyonggi, 411-791, Korea.
2. Department of Civil Engineering, Virginia Polytechnic Institute and State University, Blacks-burg, Va. 24061-0105.
3. Boeing Commercial Airplane Group, P.O. Box 3707, MS 02-60, Seattle, Wash. 98124-2207.