http://reply.papertrans.cn/3/238/23743/23743-31.png
http://reply.papertrans.cn/3/238/23743/23743-32.png
Submitted on: 21 May 2008.
Revised on: 02 July 2008.
Accepted on: 26 July 2008.
OPTIMIZATION METHODS & SOFTWARE
http://reply.papertrans.cn/3/238/23743/23743-34.png
http://reply.papertrans.cn/3/238/23743/23743-35.png
http://reply.papertrans.cn/3/238/23743/23743-36.png