1. Ph.D. Student, School of Architecture, Landscape and Civil Engineering, Earlsfort Terrace, Univ. College Dublin, Dublin 2, Ireland (corresponding author). E-mail: jianfeng.xue@ucd.ie
2. Lecturer, School of Architecture, Landscape and Civil Engineering, Earlsfort Terrace, Univ. College Dublin, Dublin 2, Ireland. E-mail: kenneth.gavin@ucd.ie