1. Engineering Design, The Pennsylvania State University, University Park, PA 16802;
2. Colegio de Ciencias e Ingeniería, Universidad San Francisco de Quito, Quito 170901, Ecuador
3. School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR 97331
4. School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR, 97331