1. Advanced Science and Engineering/Hiroshima University/Biological System Engineering Lab, Hiroshima University, Japan
2. KOBELCO Construction Machinery Co., Ltd., Japan
3. Digital Monozukuri (Manufacturing) Education and Research Center/Hiroshima University, Hiroshima University, Japan
4. The Graduate School of Engineering/Hiroshima University/Biological System Engineering Lab, Hiroshima University, Japan