About the Authors

Shih-Wei Tan

tanshwei@mail.ntou.edu.tw

Affiliation Department of Electrical Engineering, National Taiwan Ocean University, Keelung, Taiwan, Republic of China

Shih-Wen Lai

Affiliation Department of Electrical Engineering, National Taiwan Ocean University, Keelung, Taiwan, Republic of China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SWT. Performed the experiments: SWT. Analyzed the data: SWT. Contributed reagents/materials/analysis tools: SWT SWL. Wrote the paper: SWT.