A Study of Optimization of IDDD (Information Delivery System for Deaf People in a Major Disaster). - Atsushi Ito; Takao Yabe; Koichi Tsunoda; Kazutaka Ueda; Tohru Ifukube; Masahiro Fujii; Yu Watanabe; Yuko Hiramatsu; Yoshiaki Kakuda; Tomoyuki Ohta; Akira Sasaki; Hirochika Yuda (CANDAR, 2013)