User:70090

Ing. Daniela Saladino

File:Daniela2.jpg

PhD Student, ICT Doctorate School XXIII Cycle Electronics and Telecommunication Department of Information Engineering Via Vignolese 905/b 41125 Modena, Italy Email: daniela.saladino@unimore.it Tel: +39 059 2056323 website: http://www.dii.unimore.it/wonet/

Curriculum Vitae:

She is currently a Ph.D. student at Department of Information Engineering of University of Modena and Reggio Emilia (Italy) and her expected graduation date is January 2011.

She received her master degree (summa cum laude) in computer engineering from the same University on December 12, 2006, discussing a thesis on “Digital Terrestrial Television: design and development of a T-Government application”.

She attended and presented the following papers into two national conferences:

- M. L. Merani, D. Saladino, M. Stracuzzi, “Network-Wide Quality in P2P Video Streaming Systems: Models and Measurements”, Italian Networking Workshop 2009 - Cortina d'Ampezzo, Italy, January 2009

- M. L. Merani, G. P. Leonardi, D. Saladino, “A Model to Capture the Effects of Peer Churning in P2P Streaming Systems”, GTTI (Associazione Gruppo Telecomunicazioni e Tecnologie dell’Informazione) 2009 - Parma, Italy, June 2009

She contributed to the following paper:

- M. L. Merani, G. P. Leonardi, D. Saladino, “Scalability and Peer Churning in IP-TV: an Analytical Insight”. Accepted for oral presentation at Globecom 2009, Honolulu, November/December 2009.

She also contributed to the writing of an accepted book chapter, whose title is “Live Video and IPTV”, coauthored by M. L. Merani and D. Saladino, within the book “Handbook of P2P Networking”, Springer.

Reasearch Activities

My research activity focuses on P2P systems for video streaming.

Until now, I have been involved with two main subject areas: measurements and mathematical modelling.

As regards measurements, I have focused my attention on a small, mesh-pull P2P platform: StreamerOne. On this system, I performed several tests in order to better understand its functioning and to emphasize its main criticalities. I have carried out two kinds of measurements: client-side, using a network analyzer, and network wide, by analyzing the server log files to have a more complete system view. These measurements allowed me to determine the main features of the examined small overlay. I presented such preliminary outcomes in January, at a national conference in Italy, in the article entitled “Network-Wide Quality in P2P Video Streaming Systems: Models and Measurements”.

As for the second topic, I monitored the experimental efficiency exhibited by the above mentioned system in different situations and I contributed to formalize a sufficiently general model that explains the relationship between the overall system efficiency and the number of connected users. In particular, the analytical model justifies the rapid decrease of system efficiency when a sudden increase in the number of connected peers occurs. Now I’m focusing on the refinement of this mathematical model, in order to also capture system efficiency recovery after the initial decrease. I am additionally working on the development of new modules for the P2P Java based simulator named PeerSim.

Further research activity that I aim to pursue in the very next future is the development of solutions for video quality differentiation of the broadcasted video stream. The idea is to create two user classes and to devise a video distribution mechanism that provides high video quality to peers that contribute with a greater amount of upload bandwidth, whereas peers that don’t contribute in upload or contribute very little are guaranteed a lower video quality. This represents a possible countermeasure to limit the negative impact of free riders on system performance.