Publications de Zoran Despotovic

Outtweeting the Twitterers - Predicting Information Cascades in Microblogs

Karl Aberer, Wojciech Galuba, Dipanjan Chakraborty, Zoran Despotovic

Microblogging sites are a unique and dynamic Web 2.0 communication medium. Understanding the information flow in these systems can not only provide better insights into the underlying sociology, but is also crucial for applications such as content ranking, ...

2010

Castor: Scalable Secure Routing for Ad Hoc Networks

Karl Aberer, Panagiotis Papadimitratos, Marcin Poturalski, Wojciech Galuba, Zoran Despotovic

Wireless ad hoc networks are inherently vulnerable, as any node can disrupt the communication of potentially any other node in the network. Many solutions to this problem have been proposed. In this paper, we take a fresh and comprehensive approach that ad ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

Leveraging Social Networks for Increased BitTorrent Robustness

Karl Aberer, Wojciech Galuba, Zoran Despotovic

In peer-to-peer content delivery systems, such as BitTorrent, there may exist nodes that are non-cooperative and do not contribute their upload bandwidth to the system while still downloading content from others. The current widely used countermeasures aga ...

IEEE2010

Self-organized fault-tolerant routing in peer-to-peer overlays

Karl Aberer, Wojciech Galuba, Zoran Despotovic

In sufficiently large heterogeneous overlays message loss and delays are likely to occur. This has a significant impact on overlay routing, especially on longer paths. The existing solutions to this problem rely on message redundancy to mask the loss and d ...

IEEE2009

ProtoPeer: A P2P Toolkit Bridging the Gap Between Simulation and Live Deployment

Karl Aberer, Wojciech Galuba, Zoran Despotovic

2009

ProtoPeer: from Simulation to Live Deployment in One Step

Karl Aberer, Wojciech Galuba, Zoran Despotovic

We present ProtoPeer, a peer-to-peer systems prototyping toolkit that allows for switching between the event driven simulation and live network deployment without changing any of the application code. ProtoPeer exports a set of APIs for message passing, me ...

2008

Bandwidth-efficient delay- and loss-tolerant overlay routing

Karl Aberer, Wojciech Galuba, Zoran Despotovic

2008

Authentication-free fault-tolerant peer-to-peer service provisioning

Karl Aberer, Wojciech Galuba, Zoran Despotovic

The correct functioning of a peer-to-peer network relies on cooperative behavior of peers as service providers. Current approaches to detection and deterrence of non-cooperative behavior, such as reputation systems, rely on (1) global sharing of observatio ...

Springer2007

P2P Reputation Management : Probabilistic Estimation vs Social Networks

Karl Aberer, Zoran Despotovic

2006

The Complex Facets of Reputation and Trust

Karl Aberer, Wojciech Galuba, Zoran Despotovic

Trust and reputation systems have proven to be essential to enforcing cooperative behavior in peer-to-peer networks. We briefly describe the current approaches to building reputation systems: social networks formation, probabilistic estimation and game the ...

Springer2006