♣ 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...

With advances in the broadband Internet access technology and the coding techniques, video streaming services have become increasingly popular. Traditionally, video streaming services are deployed in the client/server architecture. However, this centralized architecture cannot provide streaming to a large population of users due to the limited upload capacity from the server. Peer-to-Peer (P2P)...

Structured peer-to-peer (P2P) lookup services—such as Chord, CAN, Pastry and Tapestry—organize peers into a flat overlay network and offer distributed hash table (DHT) functionality. In these systems, data is associated with keys and each peer is responsible for a subset of the keys. We study hierarchical DHTs, in which peers are organized into groups, and each group has its autonomous intra-gr...

In this paper, we are concerned with the distributed monitoring of P2P systems. We introduce the P2P Monitor system and a new declarative language, namely P2PML, for specifying monitoring tasks. A subscription is compiled into a distributed algebraic plan which is described using an algebra over XML streams. We introduce a lter for streams of XML documents that scales by processing rst simple c...

P2P is an innovative type of technology that is both flexible and scalable while providing communication autonomy throughout the system. Within this paper the P2P environment is examined with a broad ranging evolutionary procedure that addresses: previous work within the P2P field, current P2P Information System conceptual design and finally the potential of integrating P2P and workflow technol...

background: the purpose of this study was to evaluate the effectiveness of peer education among university students for reproductive health promotion based on researchers' experiences. methods: this interventional study was conducted in qazvin university of medical science during 2002 to 2004 through stakeholders' partnership and selection of 24 volunteer students according to their knowledge, ...