Acknowledgement
The authors appreciate technical supports from Prof. Dong Yong Kil at Chung-Ang University (Anseong, Korea), Prof. Changsu Kong at Kyungpook National University (Sangju, Korea), Prof. Beob Gyun Kim at Konkuk University (Seoul, Korea), and Mr. Hyunjun Choi and Dr. Inkyung Park at North Carolina State University (Raleigh, NC, USA).
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