Abstract: This paper presents an improved probability-weighted stochastic simulation algorithm(IPWSSA) which adaptively determines the weighted factor. The method can simulate chemical reaction systems, which have widely varying rate constants, more efficiently and applicably. We apply a probability-weighted and improved probability-weighted stochastic simulation algorithm to a chemical reaction system. Numerical results show that the improved method can significantly reduce the simulation time and increase precision.

Key words: stochastic simulation algorithm, probability weight, chemical reaction system