^pof;
Media;
Information;
Engineering,;
Okinawa;
National;
Collage;
of;
Technology,;
Okinawa;
9052192,;
Japan;
^pof;
Engineering,;
Department;
of;
Electrical;
and;
Computer;
Engineering,;
ThammasatUniversity,;
PathumThani;
l;
2121,;
Thailand;