3GILLESPIE R B, O'MODHRAIN M S, TANG P, et al. The virtual teacher, http://ccrma.stanford.edu/-sile/abstracts/ asme98.html, 1998.
4JOHNSON W L, SHAW E. Using agents to overcome deficiencies in Web-based Courseware [C]. Proceedings of the workshop, Intelligent Educational Systems on the World Wide Web, 8th World Conference of the AIED Society, Kobe, Japan, August 1997:18-22.
5RICKEL J, JOHNSON W L. Animated agents for procedural training in virtual reality: perception, cognition, and motor control [J]. Applied Artificial Intelligence, 1999,13: 343-382.
6GUINN C, HUBAL R. Extracting emotional information from the text of spoken dialog, http://www.cs.ubc.ca/-conati/ um03-affect/guinn-final.pdf, 2009.
7TAN T, SHI Y, GAO W. Jacob-An animated instruction agent in virtual reality [C]. Springer-Verlag Berlin Heidelberg 2000,ICMI 2000, LNCS 1948:526-533.
8LESTER J C, ZETTLEMOYER L S, GREGOIRE J P, et al, Explanatory lifelike avatars: performing user-centered tasks in 3D learning environments[C]. Agents'99, Proceedings of the Third International Conference on Autonomous Agents, ACM Press, 1999:24-31.
