Chien-Ching Chiu This email address is being protected from spambots. You need JavaScript enabled to view it.¹ , Chien-Hung Chen², Shu-Han Liao¹ and Kuan-Chung Chen¹

¹Department of Electrical Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.
²Department of Computer and Communication Engineering, Taipei College of Maritime Technology, Taipei, Taiwan 111, R.O.C.

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