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Authors:
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Toshiyuki Shiwa
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Advanced Telecommunications Research Institute International, Keihanna Science City, Kyoto, Japan
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Takayuki Kanda
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Advanced Telecommunications Research Institute International, Keihanna Science City, Kyoto, Japan
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Michita Imai
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Keio University, Yokohama, Kanagawa, Japan
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Hiroshi Ishiguro
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Osaka University, Suita, Osaka, Japan
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Norihiro Hagita
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Advanced Telecommunications Research Institute International, Keihanna Science City, Kyoto, Japan
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