Preface

In this issue, we are most appreciative to our editor, professor Hidemitsu Ogawa, for his contribution of a short note as a memorial tribute to Dr. Isao Somaya (1915-2007), who passed away on December 31st, 2007 at the age of 92.

Dr. Somaya made the earliest application of the sampling theorem in engineering, namely, transmission systems. For more of his original contribution, you may consult professor Ogawa's historical note and few translated pages of Dr. Somaya's original book in 1949, in Vol. 5, #3(Sept. 2006), pp. 247-256 of this journal.