Recently, video conferencing systems based on peer-topeer (P2P) networking technology have been widely deployed. However, most of them can only support up to a dozen of participants. In this paper, we propose a novel method to construct and manage a P2P network for scalable video conferencing. Our method consists of three parts: a network construction mechanism, a tree reorganization mechanism,...

In this paper, we propose a Bayesian network-based trust model. Since trust is multi-faceted, even in the same context, agents still need to develop differentiated trust in different aspects of other agents’ behaviors. The agent’s needs are different in different situations. Depending on the situation, an agent may need to consider its trust in a specific aspect of another agent’s capability or...

Using detailed data on friendship networks within neighborhoods, we investigate the importance of social interactions in one’s own residential neighborhood in the demand for housing quality. We find evidence consistent with the presence of peer effects, especially for households living in urban areas. Our findings are in line with the prediction of a model where conformity preferences underlie ...

In this paper, we characterize the user behavior in a peer-to-peer (P2P) file sharing network. Our characterization is based on the results of an extensive passive measurement study of the messages exchanged in the Gnutella P2P file sharing system. Using the data recorded during this measurement study, we analyze which queries a user issues and which files a user shares. The investigation of us...

This paper investigates the behaviour of the Evolvable Agent model (EvAg) in static and dynamic environments. The EvAg is a spatially structured Genetic Algorithm (GA) designed to work on Peer-toPeer (P2P) systems in which the population structure is a small-world graph built by newscast, a P2P protocol. Additionally to the profits in computing performance, EvAg maintains genetic diversity at t...

Quicker response times and less production costs of proposal development require further automation of sales assistant functionality in CRM environments. Automation still struggles with the handling of abstraction and the subjective character of knowledge. Based on the knowledge creation framework the paper outlines and tests the increase of search quality with Semantic Desktop technology. The ...

A variety of peer-to-peer systems use social networks to establish trust between participants. Yet the sharing of social information introduces privacy concerns. This paper proposes new privacy-preserving cryptographic protocols that enable participants to verify social proximity while exposing minimal information about the parties’ social contacts. Compared to previous results, our protocols a...

In peer-to-peer (p2p) networks, peer nodes communicate with each other with the help of overlay structure. As the peers in the p2p system join and leave the network randomly, it makes the overlay network dynamic and unstable in nature. In this paper, we propose an analytical framework to assess the robustness of different topologies adopted by these overlay structures, to withstand the random m...

Many peer-to-peer systems require a way of accurately assessing the bandwidth of their constituent peers. However, nodes cannot be trusted to accurately report their own capacity in the presence of incentives to the contrary and thus self-reporting can lead to poor network performance and security flaws. We present EigenSpeed, a secure and accurate peer-to-peer bandwidth evaluation system based...

The structure of networks can be characterized by the frequency of different subnetwork patterns found within them. Where these frequencies deviate from what would be expected in random networks they are termed “motifs” of the network. Interestingly it is often found that networks performing similar functions evidence similar motif frequencies. We present results from a motif analysis of networ...