Open access peer-reviewed chapter
By Jaeho Jeong, Jae-Jin Lee and Kong-Joo Lee
Submitted: April 3rd 2011Reviewed: September 18th 2011Published: February 29th 2012
© 2012 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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