*Yitao Xu¹, Hiroki Takahashi¹, Koji Kimita¹, Nariaki Nishino¹ (1. University of Tokyo)

*Mayumi Ehara¹, Yoshikazu Maegawa¹ (1. Graduate School of Management, Kyoto University)

*Tatsunori Hara¹ (1. The University of Tokyo)

*Takumi Ito¹, Nariaki Nishino¹, Hiroki Takahashi¹, Ayato Kitadai¹, Masanori Fujita¹, Yumiko Nagoh¹, Tetsu Natsume², Fumiaki Miyahara² (1. The University of Tokyo, 2. Sony Computer Science Laboratories)

*Ayato Kitadai¹, Masanori Fujita², Nariaki Nishino² (1. The University of Tokyo, Faculty of Engineering, 2. The University of Tokyo, School of Engineering)