1. School of Engineering, The Univ. of British Columbia, Okanagan Campus, 3333 Univ. Way, Kelowna, BC, Canada V1V 1V7 (corresponding author).
2. School of Engineering, The Univ. of British Columbia, Okanagan Campus, 3333 Univ. Way, Kelowna, BC, Canada V1V 1V7.