PRICAI 2018: Trends in Artificial Intelligence 15th Pacific Rim International Conference on Artificial Intelligence, Nanjing, China, August 28-31, 2018, Proceedings, Part II - Geng, Xin; Geng, Xin; Kang, Byeong-Ho; Kang, Byeong-Ho (Springer International Publishing : Imprint: Springer, 2018)