Abstract
Recently performance of IC factorization preconditioning with Inverse-based Dropping has been reported. In that paper, it turned out that the ib_IC factorization of CG method is very effective in view of stability of convergence. In our paper, we make ib_IC factorization preconditioning more efficient using variable parameter of α for diagonal entries of matrix. Moreover, we adopt the MRTR method as the solver of linear systems. This paper will make clear significant characteristics of the proposed accelerated variable type of ib_IC factorization through many numerical experiments.
