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*MAKI ISHIKI
Graduate School of Engineering and Science, Universuty of the Ryukyus
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HIDEAKI SAKIHAMA
Graduate School of Engineering and Science, Universuty of the Ryukyus
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AYA IWASAKI
Graduate School of Engineering and Science, Universuty of the Ryukyus
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AKIRA TOKUYAMA
Graduate School of Engineering and Science, Universuty of the Ryukyus