selected publications academic article Managing Elders’ Wandering Behavior Using Sensors-based Solutions: A Survey. International journal of gerontology. 8:49-55. 2014 book Ubiquitous Intelligence and Computing 2010 conference paper Keynote: Context-aware computing in the era of crowd sensing from personal and space context to social and community context. . 1-1. 2013 Affective-cognition modeling of product ecosystems using timed colored Petri nets. . 576-580. 2009