please read this link

http://www.sciencedirect.com/science/article/pii/S143484111300318X

if you don't have, please ask the author send you the full version

[email protected]

thank you very much Djamel, I already have that paper. it has been very helpful, but how ever, i was hoping there could be something else from that topic. i am presently working on the issue.

Please refer also to this thesis

http://personal.stevens.edu/~cchen3/proposal.pdf

Good luck

Thanks Djamel. i have the publication and it has also been helpful.