Submitted on: 17 July 2003.
Revised on: 28 August 2003.
Accepted on: 12 October 2003.
___________________Journal of Facilities Management
http://reply.papertrans.cn/2/168/16778/16778-32.png
http://reply.papertrans.cn/2/168/16778/16778-33.png
Submitted on: 15 March 2020.
Revised on: 10 May 2020.
Accepted on: 21 June 2020.
___________________Journal of Facilities Management
http://reply.papertrans.cn/2/168/16778/16778-35.png
http://reply.papertrans.cn/2/168/16778/16778-36.png