Institution: | 1. Northwestern Polytechnical University, Xi’an, China;2. Google Inc., Cambridge, USA;3. The Chinese University of Hong Kong, Hong Kong;4. University of Massachusetts, Amherst, USA;5. University of Minnesota, Minneapolis, USA;1. Karlstad University, Universitetsgatan 2, Karlstad 65188, Sweden;2. University of Naples Federico II, Via Claudio 21, Naples 80125, Italy |