1. Lecturer, Faculty of Environmental Management, Prince of Songkla Univ., P.O. Box 50 Kho Hong, Hat Yai, Songkla 90112, Thailand.
2. Assistant Professor, Dept. of Biological and Agricultural Engineering, 275 Weaver Labs, North Carolina State Univ., Raleigh, NC 27695-7625 (corresponding author).
3. Associate Professor, Dept. of Biological and Agricultural Engineering, 179 Weaver Labs, North Carolina State Univ., Raleigh, NC 27695-7625.
4. Assistant Professor, Dept. of Civil Engineering, 208 Mann Hall, North Carolina State Univ., Raleigh, NC 27695-7908.
5. Research Associate Professor, Dept. of Biological and Agricultural Engineering, 184 Weaver Labs, North Carolina State Univ., Raleigh, NC 27695-7625.