In this paper we address the problem of recognising interactions between two people in realistic scenarios for video retrieval purposes. We develop a per-person descriptor that uses attention (head orientation) and the local spatial and temporal context in a neighbourhood of each detected person. Using head orientation mitigates camera view ambiguities, while the local context, comprised of his...

Recently, mediation tools and peer-to-peer systems have allowed an important evolution for data sharing. Mediators are now mature techniques to share structured and heterogeneous data distributed through a reasonable number of nodes. Peer-to-peer architectures open new ways to build very large and dynamic networks allowing to share unstructured data as files indexed by some keywords. We propose...

During last years, mediation tools and peer-to-peer systems have allowed an important evolution for data sharing. Mediators are now mature techniques to share structured and heterogeneous data distributed through a reasonable number of nodes. Peer-to-peer architectures open new ways to build very large and dynamic networks allowing to share unsctructered data as files indexed by some keywords. ...

All existing lookup algorithms in structured peerto-peer (P2P) systems assume that all peers are uniform in resources (e.g., network bandwidth, storage and CPU). Messages are routed on the overlay network without considering the differences of capabilities among participating peers. However, the heterogeneity observed in deployed P2P systems is quite extreme (e.g., with up to 3 orders of magnit...

Structured overlay networks form amajor class of peer-to-peer systems, which are used to build scalable, fault-tolerant and selfmanagingdistributed applications. This thesis presents algorithms for structured overlay networks, on the routing and data level, in the presence of network and node dynamism. On the routing level, we provide algorithms for maintaining the structure of the overlay, and...

WANG, CHIH-CHIANG. Managing Heterogeneity in Structured Peer-to-Peer Systems. (Under the direction of Assistant Professor Khaled Harfoush). Peer-to-Peer (P2P) systems account for more than 60% of today’s Internet traffic. P2P success is attributed to the virtually unlimited capacity offered by its members, the resilience to failures, and features such as anonymous service. P2P systems are inher...

File sharing in networks is generally achieved using Peer-to-Peer (P2P) applications. Structured P2P approaches are widely used in adhoc networks due to its distributed and scalability features. Efficient mechanisms are required to handle the huge amount of data distributed to all peers. The intrinsic characteristics of P2P system makes for easier content distribution when compared to client-se...