♣ The work presented in this paper has been partially supported by FIRB project MAIS: Multichannel Adaptive Information Systems Abstract Agents in the Multilayered Multi Agent Situated System (MMASS) model can perform at-a-distance distance communication by field diffusion over the structure of the environment that hosts the agents. This paper discusses a distributed mechanism to support select...

This paper introduces Multiagent Systems (MAS) storage resource allocation algorithms and methods on a Peer-to-Peer (P2P) system of computer storage resources. MAS Complex Adaptive Systems (CAS) based on squirrels behaviors are proposed and evaluated to produce emergent global behaviors that can solve the storage resource allocation problem in a distributed system of peers. Experimental results...

In most application scenarios for Peer-to-Peer systems, in order to achieve an overall acceptable system performance an incentive scheme is required that motivates users to share as much as possible of their free resources Today most peers use connections of asymmetric links, such as A-DSL or cable modems. Therefore, users have significantly more download bandwidth than their available upload b...

Peer-to-Peer systems have become, in a short period of time, one of the fastest growing and most popular applications. The decentralized and distributed nature of p2p systems leads to living aside the client-server model. In p2p model each node takes both the roles of client and server. As a client, it can query and download its wanted data files from other nodes and as a server, it can provide...

Peer-to-Peer systems have often been advertised to as being “self-organizing”. This has become a somewhat elusive property with meaning and significance being far from clear. Answers sought in this research therefore focused on questions like: How well is self-organization understood in terms of peer-to-peer systems? How much self-organization is there really? How can, if at all, mechanisms of ...

Peer-to-Peer systems have become a focus of distributed computing these years. Document discovery is a key problem in this field. In this paper, abstract indices are proposed for content-based information retrieval in Peer-to-Peer systems, especially for multimedia documents. Abstract information is extracted from the shared documents of each peer, then the similar documents on other peers can ...

3 P2P Architectures 3 3.1 Centralized Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.2 Hybrid Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.3 Distributed Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.3.1 Unstructured P2P Distributed Systems . . . . . . . . . . . . . . . 5 3.3.2 Structured P2P Distributed Systems . . . ....