$B%8%'%k%^!<%N!wL$=O$G$9!%(B $B$3$N%9%l%C%I$r8F$s$G(B,GPL$B$NCN<1$,4V0c$C$F$$$?$3$H$r$h$/$o$+$j$^$7$?!%(B $B%G%S%"%s%W%m%8%'%/%H$N3'$5$s!$$"$j$,$H$&!*(B -- Germano Leichsenring Kobe University