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LEE Tae Yup
R&D Center, DR AXION Co., Ltd, Ulsan 689-892, Korea
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IL YOUN Jeong
School of Advanced Materials science and engineering, Sungkyunkwan Univ.
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KIM Woo Chun
R&D Center, DR AXION Co., Ltd, Ulsan 689-892, Korea
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PARK Jeong Wook
R&D Center, DR AXION Co., Ltd, Ulsan 689-892, Korea