Shu-Han Liao¹ , Hua-Pin Chen² , Chien-Ching Chiu This email address is being protected from spambots. You need JavaScript enabled to view it.¹ and Chun-Liang Liu¹

¹Department of Electrical Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.
²Department of Electronic Engineering, Ming Chi University of Technology, Taishan, Taiwan 243, R.O.C.

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