1. Institute of Agriculture & Life Science, Gyeongsang National University, Jinju 660-701, Korea
2. Protected Horticulture Research Institute, NIHHS, RDA, Haman, 637-812, Korea
3. Dept. of Agricultural Engineering, National Academy of Agricultural Science, RDA, Wanju 565-851, Korea
4. Dept. of Industrial & Management Eng. Kangwon National University, Samcheok 245-711, Korea
5. Dept. of Agricultural Eng., Gyeongsang National Univ.(Institute of Agriculture and Life Science), Jinju 660-701, Korea