Katsuhiko Kaji

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Understandings of human activity through wearable sensors will enable the next-generation human-oriented computing. However, most of researches on the activity recognition so far are based on small number of test subjects, and not well adapted for real world applications. To overcome the situation, we have started a project named "HASC Challenge" to collect(More)
Explicit multiunicast (XCAST) is a form of small group multicast in which the sender embeds IP addresses of all receiving nodes in a special header and sends it with all data packets. On sending, each XCAST-aware router in the path examines the packet and partitions the destinations into various sets based on their next hops. For each set, the router uses a(More)
In this paper, we propose a high accuracy indoor positioning method that uses residual magnetism in addition to Pedestrian Dead Reckoning (PDR) and WiFi-based localization methods. Our proposed method needs WiFi and magnetic field fingerprints, which are created by measuring in advance the WiFi radio waves and the magnetic field in the target map. The(More)
This paper presents a technique for enhancing music information by annotation, and we apply the technique of annotated music to a collaborative music creation system on the Web, Music Resonator (MR). In MR, a user retrieves music fragments from Pool, processes them on Operation Diagram Editor and shares new music fragments with others, just as people(More)
We propose a novel video mediation method that immerses remote users in a virtual shared space. In the implemented system using this method, video cameras and screens surround users, and on the screens placed behind them remote users and physical or virtual objects are all shown in life-size. Unlike conventional video conferencing systems, the method can(More)
Collaborative distributed tabletop activities involving real objects are complicated by invisibility factors introduced into the workspace. In this paper, we propose a technique called "remote lag" to alleviate the problems caused by the invisibility of remote gestures. The technique provides people with instant playback of remote gestures to recover from(More)