Open access peer-reviewed chapter
By Akihiro Takeuchi, Kan Okubo and Nobunao Takeuchi
Submitted: February 21st 2011Reviewed: August 3rd 2011Published: January 25th 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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