Publications de Zoran Despotovic

Outtweeting the Twitterers - Predicting Information Cascades in Microblogs

Zoran Despotovic, Karl Aberer, Wojciech Galuba, Dipanjan Chakraborty

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

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

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

Zoran Despotovic, Karl Aberer, Wojciech Galuba

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

Zoran Despotovic, Karl Aberer, Wojciech Galuba

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

Zoran Despotovic, Karl Aberer, Wojciech Galuba

2009

ProtoPeer: from Simulation to Live Deployment in One Step

Zoran Despotovic, Karl Aberer, Wojciech Galuba

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

Zoran Despotovic, Karl Aberer, Wojciech Galuba

2008

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

Zoran Despotovic, Karl Aberer, Wojciech Galuba

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

Zoran Despotovic, Karl Aberer

2006

The Complex Facets of Reputation and Trust

Zoran Despotovic, Karl Aberer, Wojciech Galuba

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

Building trust-aware P2P systems : from trust and reputation management to decentralized e-commerce applications

Zoran Despotovic

This thesis is concerned with enabling e-commerce applications in decentralized environments, P2P networks in particular. The work goes along the following two dimensions: P2P reputation systems design and building P2P e-commerce services and applications. ...

EPFL2005

Probabilistic Prediction of Peers' Performances in P2P Networks

Zoran Despotovic, Karl Aberer

2005

A Probabilistic Approach to Predict Peers' Performance in P2P Networks

Zoran Despotovic, Karl Aberer

2004

Separating Business Process from User Interaction in Web-Based Information Commerce

Zoran Despotovic, Karl Aberer, Anwitaman Datta

In Web-based information commerce it is diffcult to disentangle presentation from process logic, and sometimes even data is not separate from the presentation. Consequently, it becomes crucial to define an abstract model for business processes and their ma ...

2003

Advanced Peer-to-Peer Networking: The P-Grid System and its Applications

Philippe Cudré-Mauroux, Jie Wu, Zoran Despotovic, Karl Aberer, Anwitaman Datta, Manfred Hauswirth, Roman Schmidt

The limitations of client/server systems become evident in an Internet-scale distributed environment. Peer-topeer (P2P) systems offer an interesting alternative to traditional client/server systems: Every node acts both as a client and a server and “ ...

2003