1. Postdoctoral Associate, Ocean Engineering Program, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.
2. Associate Professor, Ocean Engineering Program, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136 (corresponding author).
3. Associate Professor, Division of Ocean System Engineering, Korea Maritime Univ., Pusan 606-791, Republic of Korea; formerly, Visiting Scholar, Ocean Engineering Program, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.