Qiangfeng Xiao¹, Ding Weng¹, Zhenglong Yang¹, Javier Garay², Minjuan Zhang³*, and Yunfeng Lu¹*
¹ University of California, Los Angeles, USA
² University of California, Riverside, USA
³ Toyota Motor Engineering and Manufacturing North America, Inc., USA
DOI 10.1007/s12274-010-0030-8
Date of acceptance: 6 August 2010