1. Department of Bio-Industrial Machinery Engineering, College of Agriculture and Life Science, Gyeongsang National University(Institute of Agriculture & Life Science), Jinju 660-701, Korea
2. Department of Agricultural Engineering, National Academy of Agricultural Science, RDA, Wanju 565-851, Korea
3. Department of Agricultural Engineering, College of Agriculture and Life Science, Gyeongsang National University (Institute of Agriculture & Life Science), Jinju 660-701, Korea