1. Respectively, Associate Professor, Agricultural Engineering Department and Hydrotech Research Institute, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, Taiwan, R.O.C.; Assistant Professor, Mathematics Department, University of Florida, Little Hall, Gainesville, Florida 32611; and Graduate Students, National Taiwan University, Agricultural Engineering Department, Taipei, Taiwan, R.O.C. (E‐Mail/Cheng: ).