20 citations · 26 across the 5 of their papers we have counts for
5 papers
Open-ended Evolution and a Mechanism of Novelties in Web Services
Takashi Ikegami, Yasuhiro Hashimoto, Mizuki Oka
Analogous to living ecosystems in nature, web services form an artificial ecosystem consisting of many tags and their associated media, such as photographs, movies, and web pages c…
Anomalous popularity growth in social tagging ecosystems
Yasuhiro Hashimoto, Mizuki Oka, Takashi Ikegami
In social tagging systems, the diversity of tag vocabulary and the popularity of such tags continue to increase as they are exposed to selection pressure derived from our cognitive…
How the nature of web services drives vocabulary creation in social tagging
Koya Sato, Mizuki Oka, Yasuhiro Hashimoto +2
A social tagging system allows users to add arbitrary strings, called "tags", on a shared resource to organize and manage information. The Yule--Simon process, which has shown the…
Growth fluctuation in preferential attachment dynamics
Yasuhiro Hashimoto
In the Yule-Simon process, selection of words follows the preferential attachment mechanism, resulting in the power-law growth in the cumulative number of individual word occurrenc…
Self-organization on social media: endo-exo bursts and baseline fluctuations
Mizuki Oka, Yasuhiro Hashimoto, Takashi Ikegami
A salient dynamic property of social media is bursting behavior. In this paper, we study bursting behavior in terms of the temporal relation between a preceding baseline fluctuatio…