Junki Matsuo
Graduate School of Human Science and Environment, University of Hyogo, Japan
Japan

Junki Matsuo is a student of Graduate School of Human Science and Environment, University of Hyogo. His research interests include geographic information systems. He is a student member of Information Processing Society of Japan and the Database Society of Japan.

Daisuke Kitayama
Graduate School of Human Science and Environment, University of Hyogo, Japan
Japan

Daisuke Kitayama is an Assistant Professor at Human Science and Environment, University of Hyogo. His research interests include multimedia database, data analysis, and integration of heterogeneous media. He received a Ph.D in human science and environment in 2009 from University of Hyogo. He is a member of Information Prepossessing Society of Japan and Database Society of Japan.

Ryong Lee
National Institute of Information and Communications Technology (NICT), Japan
Japan

Ryong Lee is an Expert Researcher at National Institute of Information and Communications Technology (NICT). His research interests include geographic information systems, social network analysis and web information retrieval systems. He is a member of ACM and Institute of Electronics, Information and Communication Engineers. He received a Ph.D. and a M.S. from Graduate School of Social Informatics, Kyoto University in 2003 and worked as a senior researcher at Samsung Advanced Institute of Technology until June, 2008.

Kazutoshi Sumiya
Graduate School of Human Science and Environment, University of Hyogo, Japan
Japan

Kazutoshi Sumiya is a Professor at Human Science and Environment, University of Hyogo. He received the Ph.D. degree in engineering in 1998 from the Kobe University Graduate School of Science and Technology. His research interests include multimedia database and data broadcasting. He is a member of IEEE Computer Society, ACM, the Institute of Image Information and Television Engineers, Information Processing Society of Japan and the Database Society of Japan and the Institute of Electronics, Information and Communication Engineers.