Where: the For( l ) k represent the failure rate of branch k l .
The event 2 A occurs caused by the flow change after
event 1 A . There is correlation between 1 A and 2 A . To study
their relevance is to obtain P( A | A ) 2 1 from
P( A ) 1 and P( A ) 2 . In order to improve the computing speed,
two evaluation indicators are introduced when considering the
related failure: fault evaluation index lk ,m+1 F [11] and lines
dielectric
lk L [12].
Lines dielectric can be obtained by Djikstra algorithm [13].