$B$H$j$"$($:>pJs$G$9!#(B Tamago4 $B$G$N<-=qEPO?$O!V$b$A$m$s$G$-$k!W$=$&$G$9!#4X?tL>$O(B egg-toroku-region $B$@$=$&$G$9!#(B -- TAKAHASHI Naoto Electrotechnical Laboratory, Japan ntakahas@xxxxxxxxx http://www.etl.go.jp/~ntakahas/