Recent Publications

• " Development of a Surgical Simulator for Training Laparoscopic Procedures " . C.A. Diaz, D. Posada, H. Trefftz, J. Bernal To be published in the International Journal of Education and Information Technologies
• " Development of a Physical Interface to Interact with a Virtual Laparoscopic Environment " . D. Posada, C.A. Diaz, H. Trefftz, J. Bernal In Proceedings of the Communications and Information Technology 2008 Marathon Beach, Attica, June 1-3, 2008.
• " Ensenyanza Remota de Conceptos Anatomicos y Funcionales del Sistema Musculo-Esqueletico (Remote teaching of anatomical and functional concepts of the muscle-skeleton system) " . C.A. Diaz, H. Trefftz, F. Pineda In Proceedings of the IV Latin American Congress on Biomedical Engineering (CLAIB200) Co-Sponsored by: Institute of Electrical & Electronics Engineers (IEEE) Margarita Island, Venezuela, September 24 - 28, 2007.
• " Remote Collaboration with Augmented and Virtual Reality Interfaces " . L.E. Cifuentes, E. Berrio, D.E. Newball, H. Trefftz. Published in Proceedings of the The 2007 World Congress in Computer Science, Computer Engineering and Applied Computing (WorldComp 07) Las Vegas, Nevada, USA. June 25-28, 2007.
• " Supporting the Learning Process in the Classroom Using 3D Collaboration on Mobile Devices " . J. Trefftz, O. Gómez, P.V. Esteban, J. Trujillo, E. Montoya. Published in the IADIS International Journal On www/Internet December 2006. Vol.4 Issue 2. ISSN 1645-7641.
• " Collaborative Virtual Environments for Teaching Physics " . F. Giraldo, A.M. Jimenez, P.V. Esteban, H. Trefftz In Proceedings of the International Joint Conferences on Computer, Information, and Systems Sciences, and Engineering (CISSE 2006) Co-Sponsored by: Institute of Electrical & Electronics Engineers (IEEE) University of Bridgeport, December 4 - 8, 2006.
• " Supporting the Learning Process in the Classroom using 3D Collaboration on Mobile Devices " . H. Trefftz, O. Gomez, P.V. Esteban, J. Truillo, E. Montoya In Proceedings of the IADIS International Conference Mobile Learning 2006 Dublin, Ireland, July 14 - 16, 2006.
• " Collaborative and Distributed Augmented Reality in Teaching Multi-Variate Calculus " . C. Orozco, P. V. Esteban, H. Trefftz. In Proceedings of the IASTED International Conference on Web based Education (WBE 2006) Puerto Vallarta, Mexico, January 23 - 25, 2006.
• " Telepresence Support for Synchronous Distance Education " . J. Restrepo and H. Trefftz In proceedings of the ACM Symposium on Virtual Reality Software and Technology (VRST 2005) Monterey, California, November 7 - 9, 2005.
• " Reconstruccion Virtual del Mito Embera de la Creacion del Agua Utilizando Agentes Autonomos " . A. Quiroz, S. Velez, J. Restrepo, H. Trefftz, J.D. Velasquez In Revista Universidad Eafit. Vol. 41 Num 140. October, November, December, 2005. pp 58 - 74.
• " Combinatory Multicast for Differentiated Data Transmission in Distributed Virtual Environments " . A. Quiroz, H. Trefftz. In proceedings of the IASTED International Conference on Computer Graphics and Imaging (CGIM 2004) Kawai, Hawaii, August 15 - 17, 2004.
• " Adaptive handling of Bandwidth Heterogeneity in Collaborative Virtual Environments " . M. A. Ruiz, J. I. Giraldo, H. Trefftz. In proceedings of the International Conference on Telecommunications and Computer Networks (IADAT-tcn 2004) San Sebastian, December 1 - 3, 2004.
• " Augmented Reality: A space for the understanding of Multi-Variate Calculus. " . P. Esteban, J. E. Jaramillo, N. Alvarez, J. Restrepo, H. Trefftz. In proceedings of the International Conference on Education (IADAT-e 2004) Bilbao, Spain, July 7 - 9, 2004.
• " Telepresence for Distance Eduaction: Lessons Learned. " . A. Agudelo, L. Escobar, J. Restrepo, C. Zea, H. Trefftz. In proceedings of the International Conference on Education (IADAT-e 2004) Bilbao, Spain, July 7 - 9, 2004.
• " A Collaborative Tool for Synchronous Distance Education. " . A. Agudelo, L. Escobar, J. Restrepo, A. Quiroz, H. Trefftz. In proceedings of the The 7th IASTED International Conference on COMPUTERS AND ADVANCED TECHNOLOGY IN EDUCATION (CATE 2004) Kawai, Hawaii, August 16 - 18, 2004.
• " Implementacion de una topologia hibrida para el manejo de colisiones en un ambiente de Realidad Virtual (Implementation of a hybrid topology for the handling of collisions in virtual environments) " . D. Alvarez, H. Trefftz. In Revista Universidad Eafit. Vol. 14 Num 136. November, December, 2004.
• " Telepresence in Synchronous Distance Education Sessions " . L. Escobar, E. Rendon, J. Restrepo, E. Montoya, C. Zea, H. Trefftz In proceedings of the Second International Conference on Multimedia and ICTs in Education (M-ICTE 2003) ,pp 1070-1074, Badajoz, Spain, December 3-6, 2003.
• " Augmented Reality for Teaching Multi-Variate Calculus " . N. Alvarez, J. E. Jaramillo, J. Restrepo, H. Trefftz, P. Esteban In proceedings of the Second International Conference on Multimedia and ICTs in Education (M-ICTE 2003) ,pp 1271-1275, Badajoz, Spain, December 3-6, 2003.
• " Area of Interest Management by Grid-Based Discrete Aura Approximations for Distributed Virtual Environments " . Juan E. Jaramillo, Lina Escobar, Helmuth Trefftz In proceedings of the 6th Symposium on Virtual Reality (SVR 2003) ,pp 342-353, Ribeirao Preto, SP - Brazil, October 15-18, 2003
• " Networked Virtual Environments " . Helmuth Trefftz Tutorial in 6th IASTED International Conference on COMPUTERS, GRAPHICS, AND IMAGING (CGIM 2003) Honolulu, Hawaii, August 13-15, 2003
• " Dynamic Server Allocation in Virtual Environments, Using Quadtrees for Dynamic Space Partition " . A. Restrepo, A. Montoya and H. Trefftz In proceedings of IASTED Computer Science and Technology (CST 2003) , pp 364 - 368, Cancún, México, May 19-21, 2003.
• " Agents as Tutors in Augmented Reality " . N. Álvarez, H. Trefftz. In proceedings of IASTED Computer Science and Technology (CST 2003) , pp 249 - 252, Cancún, México, May 19-21, 2003.
• " Achieving Object Persistence In An Augmented Reality Indoor Environment " . M. D. Gutiérrez, A. M. Márquez, H. Trefftz. In proceedings of IASTED Computer Science and Technology (CST 2003) , pp 259 - 263, Cancún, México, May 19-21, 2003.
• "Handling Heterogeneity in Networked Virtual Environments" H. Trefftz, I. Marsic, M. Zyda. In Presence: Teleoperators and Virtual Environments, Volume 12, Number 1, pp 37-51, February 2003.
• "Observations about an Approximate Algorithm for the Point Robot Motion Planning Problem".  C. Trefftz, H. Trefftz.  In Proceedings of the XXII International Conference of the Chilean Computer Science Society.  Copiapó, Atacama, Chile, Novembre 6 - 8, 2002, pp 52 - 55.
• "Handling Heterogeneity in Networked Virtual Environments" H. Trefftz, I. Marsic, M. Zyda. In Proceedings of the IEEE Virtual Reality Conference 2002, Orlando, Florida, March 24 - 28, 2002, pp 7 - 14.
• "Message Caching for Global and Local Resource Optimization in Shared Virtual Environments" H. Trefftz, I. Marsic. In Virtual Reality Software & Technology VRST 2000 , Seoul, Korea, October 22 - 25, 2000, pp 97 - 102.
• "Local and Global Impact of Message Caching in Shared Virtual Environments" H. Trefftz, I. Marsic. In Proceedings of the IASTED International Conference on Computer Graphics and Imaging 2000 (CGIM 2000) Las Vegas, NV, November 19-23, 2000, pp 8 - 13.
• "Heteregeneous Collaboration Using XML" I. Marsic, A. Krebs, H. Trefftz, B. Dorohonceanu, M. Tremaine. Submitted to Computer Supported Cooperative Work CSCW 2000 , Philadelphia, Pennsylvania, December 2 - 6, 2000.
• "Sharing Viewpoints in Collaborative Virtual Environments" S. Valin, A. Francu, H. Trefftz, I. Marsic. In Proceedings of the 34th Hawaii International Conference on System Sciences (HICSS-34)
• "3-D Tracking Calibration of a Polhemus Long Ranger Used with the Baron Barco Workbench" H. Trefftz, G. Burdea. Technical Report CAIP-TR-243. Center for Advanced Information Processing - Rutgers University.
• "A Heuristic for the Orthogonal Polygon Art Gallery Problem" C. Trefftz, H. Trefftz, in Eighteenth IASTED International Conference APPLIED INFORMATICS , Innsbruck, Austria, February 14 - 17, 2000.
• "Dexterous Force Feedback in 2-D and 3-D Multimedia" H. Trefftz, G. Popescu, B. Sletterink, G. Burdea. Submitted to IEEE Transactions on Multimedia. August 1999.
• "Multimodal Interaction Modeling". V. Popescu, G. Burdea, H. Trefftz. Chapter 25 in Handbook of Virtual Environment Technology. K. Stanney, Editor.  Lawrence Erlbaum Associates, Mahwah, New Jersey, 2002.
• "Virtual Reality and Distance Learning in Colombia" H. Trefftz, C. Correa, M. A. Gonzalez, J. Restrepo, C. Trefftz, IASTED International Conference COMPUTER GRAPHICS AND IMAGING , Halifax, Nova Scotia - Canada, June 1 - 3, 1998.
• "Distance Education and Distributed Virtual Environments" , H. Trefftz, C. Correa, M. A. Gonzalez, G. Imbeau, J. Restrepo, M. I. Velez, C. Trefftz, The Virtual Campus: Trends for Higher Education and Training , Madrid, Spain, November 27 - 29, 1997.