  Dynamic Fault Trees (DFT) and Dynamic Reliability Block Diagrams (DRBD) are
two modeling approaches that capture the dynamic failure behavior of
engineering systems for their reliability analysis. Recently, two independent
higher-order logic (HOL) formalizations of DFT and DRBD algebras have been
developed in the HOL4 theorem prover. In this work, we propose to integrate
these two modeling approaches for the efficient formal reliability analysis of
complex systems by leveraging upon the advantages of each method. The soundness
of this integration is provided through a formal proof of equivalence between
the DFT and DRBD algebras. We show the efficiency of the proposed integrated
formal reliability analysis on a drive-by-wire system as a case study.
