Ching-Ming Chao This email address is being protected from spambots. You need JavaScript enabled to view it.¹, Po-Zung Chen² and Shih-Yang Yang²

¹Department of Computer and Information Science, Soochow University, Taipei, Taiwan 100, R.O.C.
²Department of Computer Science and Information Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.

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