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*Yasuhiko Ito
Civil Engineering Research Institute for Cold Region
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Namio Takadama
Northern Hokkaido Branch Office, Civil Engineering Research Institute for Cold Region
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Masayo Ueda
Civil Engineering Research Institute for Cold Region
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Takashi Watanabe
Civil Engineering Research Institute for Cold Region
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*jun Shitamichi
Northern Hokkaido Branch Office, Civil Engineering Research Institute for Cold Region
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Masaru Matsuzawa
Civil Engineering Research Institute for Cold Region