1. Department of Mechanical Engineering, University of California, Berkeley, 420 Sutardja Dai Hall, Berkeley, CA 94720
2. Department of Design, Organization, and Strategy (DOS), Delft University of Technology, Room B-4-040, Landbergstraat 15, Delft 2628 CE, The Netherlands
3. College of Design, University of Minnesota, The Sharp Forest Apartment 207-103, Suseodong, Gangnamgu, Seoul 06203, South Korea
4. Department of Mechanical Engineering, University of California, Berkeley, Blum Hall 200E, Berkeley, CA 94704
5. Department of Mechanical Engineering, University of California, Berkeley, 6179 Etcheverry Hall, Berkeley, CA 94720