E00 O(t1-o1) (t1-0)2=2(1-0) 2 Onet OE △wj 77 =7( ),(1-O,)x OE ae anet onet, keDownstream() anetk Onet ∑ anet aE, do ∑-k k∈ Downstrean(j anet k∈ Downstream) do anet ∑ onet ∑ k∈ Downstrean(j) ∈ Downstrean(j)( ) ( ) 2( ) 2 1 ( ) 2 1 o 2 j j j j j j j j j j j d t o o t o t o t o o E = − −   − − = −   =   (1 ) ( ) j j j j j o o net netj net o = −   =    j j j j j i j i d j i t o o o x w E w = ( − ) (1− )    = −            = − −   = −     = −   = −     =   ( ) ( ) ( ) ( ) ( ) (1 ) k Downstream j k kj j j j j k Downstream j k kj k Downstream j j j j d k k Downstream j j k k k Downstream j j k k d j d w o o net o w net o o E net net net net net E net E    