Open access peer-reviewed chapter
By Masaru Ishizuka and Tomoyuki Hatakeyama
Submitted: February 6th 2011Reviewed: August 5th 2011Published: December 22nd 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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