????$B&N(B??

???	?????
???	$B!k(B?$(D*)*#(B $(D*A*$(B?$B!r(B, $B!^$(D*4$B!k$(D)A(B ?$B!k(B?$(D+c(B, ?$B"L$(D*3*d(B $(D*"(B??$(D*T(B, ?$(D*d*2)L(B ?$B!/(B?$(D*Q(B, ??$(D*3*d(B $(D*.+B(B?$(D*A(B
????	?$(D)C(B?$(D*4(B?$(D+2*!+d"p(B?$(D"p+1"p*B*4"1(B?$(D+b**+4(B??
??????	$(D"D"n(B?$(D),(B??$(D*4+Q(B
Series	PRMU2003-222
???	2004?2??

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