Doctor of Philosophy, Osaka University, 1992.
Research associate Kyushu Institute of Technology, Iizuka, Japan, 1992—1998. Associate professor Hiroshima University, Higashi-Hiroshima, 1998—2005, professor, since 2005. Guest scientist Institute Information Transmission Problems, Union of the Soviet Socialist Republics Academy of Sciences, Moscow, 1990—1990.
Guest researcher Technical Research Centre of Finland Information Technology, Tampere, Finland, 1994—1995.
Member of Institute of Electrical and Electronics Engineers.