Manuscript received January 11, 2010. This work was supported in part by Department of Computer Science and Engineering, Yuan-Ze University.
I-Shyan Hwang is with the Department of Computer Science and Engineering, Yuan-Ze University, Chung-Li, Taiwan.
Jhong-Yue Lee is currently pursuing the Ph.D. degree at the Department of Computer Science and Engineering, Yuan-Ze University, Chung-Li, Taiwan.
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