1. Master’s Program in Intelligent and Mechanical Interaction Systems, Degree Programs in Systems and Information Engineering, Graduate School of Science and Technology, University of Tsukuba, Tsukuba, Ibaraki, Japan
2. Department of Intelligent Interaction Technologies, Faculty of Engineering, Information and Systems, University of Tsukuba, Tsukuba, Ibaraki, Japan
3. Department of Electrical Engineering, Electronics, and Applied Physics, Saitama University, Saitama, Japan