Koya Sato

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The social tagging system allows users to add arbitrary strings, namely 'tags', on a shared resource to organise and manage information. The Yule–Simon process, which is known to capture the population dynamics of social tagging behaviour, does not handle the mechanism of new vocabulary creation because this model assumes that new vocabulary creation is a(More)
In order to fill the gap between various levels of ball game players, we propose the Sports Support System that can reduce the difference among the skills of various players by augmenting the traditional ball game. We implemented a system that visualizes the trajectory and velocity of the ball for soccer games, as one example of ball games. This(More)
SUMMARY In this paper, we propose the novel concept of a spectrum database for improving the efficiency of spectrum utilization. In the current design of TV white space spectrum databases, a propagation model is utilized to determine the spectrum availability. However, this propagation model has poor accuracy for radio environment estimation because it(More)
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