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)
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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