Affiliation: | a Department of Computer Science and Information Engineering, National Penghu University of Science and Technology, #300, Liu-Ho Rd., Makung, Penghu 880, Taiwan b Department of Electronic Engineering, National Kaohsiung University of Applied Sciences, #415, Chien Kung Rd., Kaohsiung 807, Taiwan c Department of Electrical Engineering, Dayeh University, #168, University Rd., Dacun, Changhua 515, Taiwan |