Department of Computer Science and Engineering, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan, R.O.C. thtsai@saturn.yzu.edu.tw|Department of Computer Science and Engineering, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan, R.O.C. thtsai@saturn.yzu.edu.tw|Department of Computer Science and Engineering, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan, R.O.C. thtsai@saturn.yzu.edu.tw|Department of Computer Science and Engineering, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan, R.O.C. thtsai@saturn.yzu.edu.tw|Department of Computer Science and Engineering, Yuan Ze University, Chung-Li, Taoyuan 32003, Taiwan, R.O.C. thtsai@saturn.yzu.edu.tw