Before revision:  It can be regarded as a generalization of the one used by Steffen Liepelt and Reinhard Lipowsky (PRL 98, 258102 (2007)) . The method used in this research is similar as the one used by Michael E. Fisher and Anatoly B. Kolomeisky (PNAS(2001) 98(14) P7748-7753) .
After revision:  It can be regarded as a generalization of the one used by Steffen Liepelt and Reinhard Lipowsky (PRL 98, 258102 (2007)) , is based on the discrete mechanochemical states of a molecular motor with multiple cycles. By generalizing the mathematical method developed by Fisher and Kolomeisky for single cycle motor (PNAS(2001) 98(14) P7748-7753) .