Chin-Hwa Kuo¹ , Tzu-Chuan Chou This email address is being protected from spambots. You need JavaScript enabled to view it.² and Meng-Chang Chen²

¹Department of Computer Science and Information Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C
²Institute of Information Science, Academia Sinica, Taipei, Taiwan 115, R.O.C.

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