Rumen D. AndreevRumen Andreev is head of department “Communication Systems and Services” of Institute of Information and Communication Technologies, Bulgarian Academy of Sciences. He has received MSc degree in Automation and holds PhD in Computer Aided Design from Tchnical University of Sofia. He has both research and practical expertise in computer graphics, computer-aided design, human-computer interactions and enhancement of resources for collaborative, cooperative work and personalized e-learning. His research has been published in the monograph “Graphics Systems: Architecture and Realization, Elsevier and in international journals including the Computers and Graphics, Computer Graphics Forum, Interacting with Computers, Communication and Cognition. He is member of Union of Automation and Informatics, UAI-Bulgaria. Read More Read Less