**Author details**

Shouren Huang<sup>1</sup> \*, Yuji Yamakawa<sup>2</sup> and Masatoshi Ishikawa<sup>1</sup>

1 Graduate School of Information Science and Technology, University of Tokyo, Tokyo, Japan

2 Interfaculty Initiative in Information Studies, University of Tokyo, Tokyo, Japan

\*Address all correspondence to: huang\_shouren@ipc.i.u-tokyo.ac.jp

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
