Open access
Submitted: October 27th, 2010 Published: December 22nd, 2011
DOI: 10.5772/18430
From the Edited Volume
Edited by Dongmei Chen
Submitted: October 27th, 2010 Published: 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.