Fragkiskos' Home Page

Bio

I graduated from the Electrical and Computer Engineering department of the National Technical University of Athens (NTUA), Greece, in 2002. In December 2007 I received the PhD degree from the Electrical Engineering department at the University of Southern California (USC) in Los Angeles. From January 2008 to July 2009 I was a postdoctoral scholar at CAIDA/UCSD working with Dmitri Krioukov. Since September 2009 I am a visiting lecturer at the Department of Electrical and Computer Engineering at the University of Cyprus .

Research Interests

Scaling behavior of the performance of computer networks and methods for scalable performance prediction, navigability of complex networks, network topology, P2P systems, queueing theory, graph theory.

Publications

Greedy Forwarding in Dynamic Scale-Free Networks Embedded in Hyperbolic Metric Spaces Fragkiskos Papadopoulos, Dmitri Krioukov, Marian Boguna, and Amin Vahdat, IEEE INFOCOM, San Diego, CA, March 2010.

On Scaling the IEEE 802.11 to Facilitate Scalable Wireless Networks Fragkiskos Papadopoulos, Computer Networks Journal (COMNET), Elsevier, accepted February 2010.

Modelling BitTorrent-like Systems in Heterogeneous Environments Wei-Cherng Liao, Fragkiskos Papadopoulos, and Konstantinos Psounis, IEEE Transactions on Parallel and Distributed Systems, December 2009 (pending minor revision).

Curvature and Temperature of Complex Networks Dmitri Krioukov, Fragkiskos Papadopoulos, Amin Vahdat, and Marian Boguna, Physical Review E (PRE), American Physical Society, Vol. 80, Issue 3, September 2009.

Greedy Forwarding in Scale-Free Networks Embedded in Hyperbolic Metric Spaces Dmitri Krioukov, Fragkiskos Papadopoulos, Marian Boguna, and Amin Vahdat, ACM SIGMETRICS Performamce Evaluation Review, Vol. 37, Issue 2, September 2009.

Scaling Properties of IEEE 802.11 Wireless Networks Fragkiskos Papadopoulos, and Konstantinos Psounis, 6th Intl. Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WiOpt), Berlin, Germany, April 2008.

Efficient Identification of Uncongested Internet Links for Topology Downscaling Fragkiskos Papadopoulos, and Konstantinos Psounis, ACM SIGCOMM Computer Communication Review (CCR), Vol. 37, Issue 5, October 2007.

Performance Analysis of BitTorrent-like Systems with Heterogeneous Users Wei-Cherng Liao, Fragkiskos Papadopoulos, and Konstantinos Psounis, IFIP-WG7.3 PERFORMANCE, Cologne, Germany, October 2007, Journal of Performance Evaluation, Elsevier, Vol. 64, Issue 9-12, October 2007.

Predicting the Performance of Internet-like Networks using scaled-down replicas Fragkiskos Papadopoulos, and Konstantinos Psounis, ACM SIGMETRICS Performance Evaluation Review, Vol. 35, Issue 3, December 2007.

Predicting the Performance of Mobile ad hoc Networks using scaled-down replicas Fragkiskos Papadopoulos, and Konstantinos Psounis, IEEE International Conference on Communications (ICC), Glasgow, Scotland, June 2007.

Application of the Many Sources Asymptotic in Downscaling Internet-like Networks Fragkiskos Papadopoulos, and Konstantinos Psounis, Information Theory and Applications Workshop (ITA-UCSD), San Diego, CA, January 2007. (Invited paper)

Performance Preserving Topological Downscaling of Internet-like Networks Fragkiskos Papadopoulos, Konstantinos Psounis, and Ramesh Govindan, IEEE Journal on Selected Areas in Communications (JSAC), Issue on Sampling the Internet: Techniques and Applications, Vol. 24, Issue 12, December 2006.

A Peer-to-Peer Cooperation Enhancement Scheme and its Performance Analysis Wei-Cherng Liao, Fragkiskos Papadopoulos, and Konstantinos Psounis, Journal of Communications (JCM), Academy Publisher, Vol. 1, Issue 7, November 2006.

An efficient algorithm for resource sharing in Peer-to-Peer networks Wei-Cherng Liao, Fragkiskos Papadopoulos, and Konstantinos Psounis, IFIP-TC6 NETWORKING, Coimbra, Portugal, May 2006, Lecture Notes in Computer Science, Springer, Vol. 3976, May 2006.

Systems with multiple servers under heavy-tailed workloads Konstantinos Psounis, Pablo Molinero-Fernandez, Balaji Prabhakar, and Fragkiskos Papadopoulos, IFIP-WG7.3 PERFORMANCE, Juan-les-Pins, France, October 2005, Journal of Performance Evaluation, Elsevier, Vol. 62, Issue 1-4, October 2005.

Performance Preserving Network Downscaling Fragkiskos Papadopoulos, Konstantinos Psounis, and Ramesh Govindan, 38th Annual Simulation Symposium, San Diego, CA, April 2005.

Invited Presentations

Application of Hyperbolic Embedding in Overlay Network Construction Networks and Navigation Working Group, Santa Fe Institute, New Mexico, August 2008.

Ph.D. Thesis

Performance Preserving Downscaling Laws in Computer Communication Networks Fragkiskos Papadopoulos, University of Southern California, Los Angeles, October 2007.

Patents

"System and Method for Passively Monitoring Customer Control Messages in a Multicast VPN". Joint work with Bill Fenner, AT&T Labs-Research, US Patent Pending (filed Dec. 2005).

Awards/Honors

ACM SIGMETRICS travel grant, 2007.
Honorable Mention by the USC Electrical Engineering Department for the paper "Performance Preserving Topological Downscaling of Internet-like Networks", April 2007.
2nd Award of Excellence in Telecommunications by Ericsson. The award was given for my undergraduate diploma thesis with title: "Development of the User Mobility Server (UMS), suggested by the 3GPP, for multimedia services in 3rd generation mobiles", May 2003.
2-year full graduate scholarship by the Fulbright commission, 2002-2004.

Teaching at UCY

ECE 453: Wireless Telecommunication Networks, Fall 2009. (Many thanks to Stavros Toumpis for sharing his class material.)

ECE 100: Introduction to Technology, FALL 2009. (Many thanks to George Ellinas and Styliani Petroudi for sharing their class material.)

ECE 460: Advanced Computer Networks, Spring 2010.

ECE 313: Engineering of Operating Systems, Spring 2010.

(The above classes are on Blackboard .)

Other work

Visiting graduate student, CAIDA, Fall 2007.
Summer 2007 internship at the Cooperative Association for Internet Data Analysis (CAIDA), University of California San Diego (UCSD).
Summer 2004 internship at AT&T Labs-Research, Menlo Park, CA.
Research Assistant, USC, Fall 2004 - Spring 2007.
Spring 2005 & 2007 Teaching Assistant, for the graduate class EE650 "Advanced Topics in Computer Networks: Mathematical Techniques and Tools for Analyzing Wireless and Wired Networks".
Fall 2005 Teaching Assistant, for the undergraduate class EE465 "Probabilistic Methods in Computer Systems Modeling".
Spring 2006 Teaching Assistant, for the undergraduate class EE450 "Introduction to Computer Networks".
Fall 2006 & 2007 Teaching Assistant, for the graduate class EE555 "Broadband Network Architectures".

Professional Activities

Reviewer of IEEE/ACM Transactions on Networking.
Reviewer of Computer Networks Journal, Elsevier.

TPC IEEE Routing 2009.
TPC IEEE ICCCN 2010 (Track on Network Algorithms, Performance Evaluation and Theory).

NS Code

The following link contains a modified/enhanced version of the Webtraf utilities of the ns-2 simulator. You will need these utilities for creating Web sessions. Current ns-2 implementations allocate memory for Web sessions statically and hence they are inappropriate for running large scale experiments. The following modified version allocates memory dynamically. Just apply the patch as described in the README file.

webPatch.tar.gz