Open access peer-reviewed chapter
By Young Hoon Choi, Young Soo Song and Do Hyun Kim
Submitted: November 8th 2010Reviewed: May 15th 2011Published: November 4th 2011
© 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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