Open access peer-reviewed chapter
By Ji-Hong Li, Sung-Kook Park, Seung-Sub Oh, Jin-Ho Suh, Gyeong-Hwan Yoon and Myeong-Sook Baek
Submitted: December 9th 2010Reviewed: July 1st 2011Published: October 21st 2011
DOI: 10.5772/24620
Downloaded: 1937
© 2011 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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