1. National Kaohsiung Univ. of Applied Sciences, 415 Chien-Kung Rd. Kaohsiung 80778, TW 807 (Corresponding author), e-mail: cn.wang@kuas.edu.tw
2. National Kaohsiung Univ. of Applied Sciences, 415 Chien-Kung Rd., Kaohsiung 80778, TW 807
3. Chihlee Univ. of Technology, 313, Sec. 1, Wunhua Rd., Banciao District, New Taipei City 22050, TW
4. Foxconn Electronics Inc., 5 Quoc Tu Giam, Hanoi 115601, Vietnam
5. National Chengchi Univ., 64, Sec. 2, Zhinan Rd., Wenshan District, Taipei City 11605, TW