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T. Hirata
Dep. of Electronic Eng., Tohoku Univ.
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Y. Yagi
Dep. of Electronic Eng., Tohoku Univ.
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T. Mieno
[in Japanese]
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S. Iizuka
Dep. of Electronic Eng., Tohoku Univ.
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R. Hatakeyama
Dep. of Electronic Eng., Tohoku Univ.
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N. Sato
Dep. of Electronic Eng., Tohoku Univ.