[1] University of the Ryukyus, Japan
[2] Meidensha Corporation, Japan
[3] SICE
[4] IEE
[5] IEEE
[6] University of the Ryukyus (Electrical and Electronic Engineering)
[7] IEE Japan
[8] Department of Electrical and Electronics Engineering
[9] IEEJ
[10] Department of Electrical and Electronics Engineering, University of the Ryukyus
[11] University of the Ryukyus