1Frontier Research System, RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan E-mail: [email protected] 2Institute of Industrial Science, The University of Tokyo, Meguro, Tokyo 153-8505, Japan, and ERATO Aihara Complexity Modelling Project, JST, Shibuya-ku, Tokyo 151-0064, Japan E-mail: [email protected] 3Computer and Information Science Departme...

1 Department of Intelligence Science and Technology, Graduate School of Informatics, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto-shi, Kyoto 606-8501, Japan 2 Computational Biology Research Center, National Institute of Advanced Industrial Science and Technology, 2-43 Aomi, Koto-ku, Tokyo 135-0064, Japan 3 Brain Inc., 4-27-11 Kikari, Inzai-shi, Chiba 270-1359, Japan 4 Information Technol...

To enrich human communication in ubiquitous environments, NTT Communication Science Laboratories have been conducting research on the Real-World Semantic Web. When you deal with real-world information in ubiquitous environments, spatial information and temporal information play important roles. However, it is difficult to deal with spatial or temporal search conditions in current Web search eng...