Yasushi Sakurai received a B.S. degree from Department of Electrical Engineering, Doshisha University (1991), and M.E. and Ph.D. degrees from Graduate School of Information Science, Nara Institute of Science and Technology (1996,1999). Since 1998, he has been a researcher at NTT Cyber Space Laboratory, Japan. His research interests includes spatial indexing for high-dimensional data, multimedia databases, and information retrieval. In 2013, he joined the faculty of Kumamoto University as a full professor.