  D. Uminsky and K. Yeats [6] studied the properties of the log- operator L on
the subset of the finite symmetric sequences and prove the existence of an
infinite region R, bounded by parametrically de- fined hypersurfaces such that
any sequence corresponding a point of R is infinitely log concave. We study the
properties of a new operator L_r and redefine the hypersurfaces which
generalizes the one defined by Uminsky and Yeats [6]. We show that any sequence
corresponding a point of the region R, bounded by the new generalized
parametrically defined r-factor hypersurfaces, is Generalized r-factor
infinitely log concave. We also give an improved value of r_0 found by McNamara
and Sagan [4] as the log-concavity criterion using the new log-operator.
