Polyzos, George

Assistant Professor, Computer Science and Engineering
Division: UCSD
Phone: 858-534-3508
Email: polyzos @
Fax: 858-534-7029
Research Layer: Networked Infrastructure


George C. Polyzos joined the UCSD faculty after receiving his Ph.D. in Computer Science from the University of Toronto in 1989. He did his undergraduate work in electrical engineering at the National Technical University in Athens, Greece. Polyzos is currently on the Informatics faculty of the Athens University of Economics and Business.


Professor Polyzos' interest in wireless access to the Internet is focused on the measurement and analysis of protocol performance, adaptive multimedia applications, and the design of advanced flexible link-layer protocols for the Internet. As part of the latter, he studies quality-of-service (QoS) support issues. Polyzos and his team investigate techniques to overcome the obstacles posed to mobile wireless access by the existing Internet infrastructure and protocols. The main goal is to preserve the smoothness of real-time streams and to effectively support the automatic adaptation features of advanced applications, while remaining compatible with unaware applications. Polyzos' approach is based on two key techniques: (1) the use of a traffic priority scheme in order to preserve the smoothness of real-time streams; and (2) the incorporation of the notion of Levels of Quality (LoQ) and the use of network filters, in order to provide automatic adaptation to long-term network changes. In the area of efficient multicasting, Polyzos looks at IP Multicast optimizations (over wireless networks and with mobility), IP Multicast and Mobile IP, IP Multicast for point-to-point distribution, and multimedia multicast over ATM and IP networks.