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							Yukio Iwaya
														
									Dapartment of Electronic Engineering,Akita University
							 
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							Yoiti Suzuki
														
									Research Institute of Electrical Communication,Tohoku University
							 
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							Masato Sakata
														
									Dapartment of Electronic Engineering,Akita University
							 
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							Toshio Sone
														
									Research Institute of Electrical Communication,Tohoku University