"of the existing approach" is correct and usable in written English.
You could use it in a sentence such as, "This new idea is an improvement of the existing approach."
They compared CO2 oil swelling factors from both types of the experiments to decide what other parameters should be taken into account to further improve the accuracy and reliability of the existing approach.
The blocking ratio of our proposed algorithm is lower than that of the existing approach EVPF, since our approaches consume less physical network resources while guaranteeing the same level of reliability of VN requests, thus lowering the blocking ratio.
The proposed analytical framework can be considered as an analytical formulation of the existing approach based on historical directional wind speed data, but with an additional capability of accounting for the uncertainty of extreme response conditional on wind speed and direction.
Does the provider perceive limitations of the existing approach?
The process of reassociation in the existing approach is illustrated by using the scenarios shown in Fig. 1.
The cluster approach should complement existing reports, and not only reproduce the same ratings of hospitals as the existing approach [ 17].
So they can help to overcome the complexity issues of the existing approaches.
Most of the existing approaches only analyse the controllability of a given set of design alternatives.
We thus introduce a novel approach named WR to overcome the aforementioned problems of the existing approaches in literature.
Most of the existing approaches utilize both solution quality and convergence rate to perform comparative analysis.
Many of the existing approaches in Software Comprehension focus on program structure or external documentation.
