作者机构:[1]Department of Automation, Tsinghua University, Beijing 100084, China
相关基金:Partly supported by the National Key Basic Research and Devel opment (973) Program of China (No. 2006CB705506), the National High-Tech Research and Development (863) Program of China (Nos. 2006AA11Z229, 2007AA11Z222), and the National Natural Science Foundation of China (Nos. 60374059, 50708055)