作者机构:[1]Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China, [2]Department of Automation, Tsinghua University, Beijing 100084, China
相关基金:Supported by the National Natural Science Foundation of China(No.60574085); the National High-Tech Research and Development (863) Program of China (No.2006AA04Z428);the China Postdoctoral Science Foundation (No.20090450402)