1. Department of Bioproduction Science, Graduate School of Horticulture, Chiba University, Matsudo, Japan
2. Vietnam Vegetable Center, Agritech Japan Co., Ltd., Hyogo, Japan
3. Department of Human and Social Systems, Institute of Industrial Science, The Univeristy of Tokyo, Tokyo, Japan
4. Advanced Technology Research Laboratories, Nippon Steel & Sumitomo Metal Co., Futtsu, Japan
5. Production & Engineering Department, Sangyo Shinko Co., Ltd., Tokyo Japan