1. Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
2. Department of Agricultural and Biosystem Engineering, Universitas Padjadjaran, Jatinangor, Sumedang 45363, Indonesia
3. Department of Agricultural Engineering, University of Paradeniya, Kandy 20400, Sri Lanka
4. Faculty of Life and Environmental Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan