http://reply.papertrans.cn/2/118/11767/11767-31.png
Submitted on: 02 January 2011.
Revised on: 05 February 2011.
Accepted on: 28 February 2011.
___________________IEEE Control Systems Letters---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Submitted on: 06 April 2011.
Revised on: 29 June 2011.
Accepted on: 27 August 2011.
___________________IEEE Control Systems Letters---IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
http://reply.papertrans.cn/2/118/11767/11767-34.png
http://reply.papertrans.cn/2/118/11767/11767-35.png
http://reply.papertrans.cn/2/118/11767/11767-36.png