Data quality is becoming an increasingly important issue in environments characterized by extensive data replication. Among such environments, this paper focuses on Cooperative Information Systems (CISs), for which it is very important to declare and access quality of data. Indeed, a system in the CIS will not easily exchange data with another system without a knowledge on its quality, and coop...

P2P systems are a natural way of supporting GroupCommunication (GC) applications. Furthermore, their core characteristics (e.g., self-organisation, self-recovery, decentralisation) match particularly well MANET features. For these reasons we developed and tested a simple yet significant GC application on top of different P2P substrates. Our aim is to understand which type of P2P system is more ...

The field of peer-to-peer reputation systems has exploded in the last few years. Our goal is to organize existing ideas and work to facilitate system design. We present a taxonomy of reputation system components, their properties, and discuss how user behavior and technical constraints can conflict. In our discussion, we describe research that exemplifies compromises made to deliver a useable, ...

Crises range from global catastrophes to personal disasters. However, systematic inquiry on crises rarely employs a comparative approach to examine commonalities between these seemingly very different events. We argue here that individual psychosocial disasters can inform a broader discussion on crises. Our approach applies general crisis theory to a smartphone based psychosocial support system...

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The Internet has changed from a statically, television-like web page space to a highly heterogeneous and extremely dynamic information platform. No other technology forced that development like Peer-to-Peer. This short paper will briefly summarize emerging trends and promising concepts for Peer-to-Peer systems and describe upcoming challenges for developers.

There is an increasing interest in using Peer-to-Peer (P2P) architectures as a basis for software systems. However, by their very nature, achieving dependability within a P2P system can be difficult. This paper provides an initial analysis of the main issues that need to be considered when developing a dependable P2P system. It examines the key properties that can influence the dependability of...

The information flow inside a P2P network is highly dependent on the network structure. In order to ease the diffusion of relevant data toward interested peers, many P2P protocols gather similar nodes by putting them in direct contact. With this approach the similarity between nodes is computed in a pointto-point fashion: each peer individually identifies the nodes that share similar interests ...

1. ABSTRACT Peer-to-peer systems have been enjoying increasing popularity due to claims of being able to harness huge amounts of storage without the drawback of having to trust and rely on a central point of control. These systems create various issues that are not easy to solve. At this time, existing peer-to-peer systems offer solutions for some of the issues. I am engaged in exploring differ...