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Li, H.; Maekawa, Masaki; Kawasuso, Atsuo; Tanimura, Naoki*
Journal of Physics; Condensed Matter, 27(24), p.246001_1 - 246001_5, 2015/06
Times Cited Count：6 Percentile：27.97(Physics, Condensed Matter)
raysYamazaki, Takumi; Takada, Chie; Nakamura, Keisuke; Sagawa, Naoki; Hoshi, Katsuya; Nakagawa, Takahiro; Takimoto, Misaki; Tanimura, Yoshihiko*; Takahashi, Fumiaki; Momose, Takumaro; et al.
no journal, ,
no abstracts in English
Liu, X.; Machida, Masahiko; Saito, Kimiaki; Tanimura, Naoki*
no journal, ,
To extract the space dependent ecological half-lives from car-borne survey data, a linear sparse model with LASSO regularization and Bayesian background has been developed. The model has been applied to analysis the KURAMA data in Fukushima Prefecture in 2011-2016. The fitting results are in reasonably good agreement with previous works, and could be studied other space dependent factors.
Liu, X.; Machida, Masahiko; Saito, Kimiaki; Tanimura, Naoki*
no journal, ,
Ecological half-life has been widely used to describe the long-term decrease of ambient dose rates in addition to radioactive decay. In the present work, we introduce a new, robust, and efficient numerical method to extract space dependent ecological half-lives from car-borne survey data. Numerical results indicate complexed ecological half-life profiles, which are originated from their spatial patterns.
Machida, Masahiko; Liu, X.*; Tanimura, Naoki*; Saito, Kimiaki
no journal, ,
no abstracts in English
Machida, Masahiko; Uno, Shumpei*; Tanimura, Naoki*; Saito, Kimiaki; Yoshimura, Kazuya
no journal, ,
Air dose rates in urban areas decrease faster in residential areas than in evacuation zones. This suggests that human activities facilitate the reduction. However, since human activities include various factors such as decontamination and road wear caused by traffic, it is difficult to evaluate the effect of human activities by conventional analysis using monitoring data, except for the effect of decontamination. Then, this series of studies aim to evaluate the effects of human activities on the reduction. Among the series presentations, this one focuses on correlations between population dynamics characterized by mobile phone GPS information and ecological half life decays of air dose rates measured by KURAMA over a wide area with long-term monitoring using LASSO scheme.
Machida, Masahiko; Murakami, Masashi; Yoshida, Yukihiko; Sasaki, Toshiki; Tanimura, Naoki*
no journal, ,
no abstracts in English
