Agents and Peer-to-Peer Computing: 4th International by Thanasis G. Papaioannou, George D. Stamoulis (auth.), Zoran

By Thanasis G. Papaioannou, George D. Stamoulis (auth.), Zoran Despotovic, Sam Joseph, Claudio Sartori (eds.)

This booklet constitutes the completely refereed post-proceedings of the 4th foreign Workshop on brokers and Peer-to-Peer Computing, AP2PC 2005, held in Utrecht, Netherlands, on July twenty fifth, 2005, within the context of the 4th overseas Joint convention on self sufficient brokers and Multi-Agent platforms, AAMAS 2005.

The thirteen revised complete papers offered have been conscientiously reviewed and chosen from 27 submissions; they're absolutely revised to include reviewers' reviews and discussions on the workshop. the quantity is prepared in topical sections on belief and attractiveness, P2P infrastructure, semantic infrastructure, in addition to group and cellular applications.

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Additional info for Agents and Peer-to-Peer Computing: 4th International Workshop, AP2PC 2005, Utrecht, The Netherlands, July 25, 2005. Revised Papers

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On the other hand, Y has to bear the costs ci of issuing the non-repudiable disrecommendation and handing it over to X. Consequently, the disrecommendation appears to be detrimental for both the Y and Z. However, the prescription of belief revision provides a counterweight for the costs of disrecommending. If Y knew that Z subsequently disrecommends it to X, it could preemptively decrease X’s type belief regarding Z by disrecommending Z first. By this means, the impact of Z’s disrecommendation is decreased.

1 Simulation Environments For the simulation, we have implemented three types of P2P file sharing system on Chord : Normal-System, PeerRep-System, PFRep-System. A Trust Management Scheme in Structured P2P Systems 39 – Normal-System means a normal DHT-based P2P file sharing system which does not use any reputation scheme. In this system, a peer sends a query using the Chord algorithm and receives the list of providers for the requested file. Then, the provider is chosen randomly. – PeerRep-System means a DHT-based p2p system which adopts only the peer reputation scheme.

2) Irrespective of the number of transactions, the compliance costs become negative for a sufficient high ratio of normative entities. In such cases, an average normative entity outperforms an average strategic entity. Since tampering costs are non-negative, 6 Due to space limitations, we describe the setting in detail in a technical appendix. pdf 28 P. Obreiter and B. K¨onig-Ries Compliance Costs 6 Transaction Opportunities per Entity 3 5 10 15 20 25 0 -3 -6 -9 -12 20% 35% 50% 65% 80% 95% Ratio of normative entities Fig.

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