1. Research into Artifacts, Center for Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan
2. Graduate School of Advanced Science and Technology, JAIST, Ishikawa, Japan
3. Research Institute, Wakachiku Construction Company Ltd., Chiba, Japan
4. Department of Precision Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan
5. Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo, Japan