Open access peer-reviewed chapter
By Ryo Watanabe, Yasushi Sekine, Masahiko Matsukata and Eiichi Kikuchi
Submitted: May 8th 2011Reviewed: October 5th 2011Published: February 1st 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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