Rainfield Y. Yen¹ and Hong-Yu Liu This email address is being protected from spambots. You need JavaScript enabled to view it.²

¹Department of Electrical Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.
²Department of Computer and Communication Engineering, Dahan Institute of Technology, Hualien, Taiwan 971, R.O.C.

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