1. Ph.D. Candidate, School of Defense Science, Chung Cheng Institute of Technology, National Defense Univ., No. 75, Shiyuan Rd., Daxi District, Taoyuan City 33551, Taiwan, R.O.C. (corresponding author).
2. Associate Professor, Dept. of Environment Information and Engineering, Chung Cheng Institute of Technology, National Defense Univ., No. 75, Shiyuan Rd., Daxi District, Taoyuan City 33551, Taiwan, R.O.C.