Gavagai used its commercially available system for the filtering and polarity tasks in the evaluation campaign for online reputation management systems at CLEF 2013. The system is built for large scale analysis of streaming text and as part of the services Gavagai provides, it measures the public attitude visavi targets of interest. This mechanism — with no adjustment for this specific task — w...

This paper introduces a set of principles for governing the design and operation of online reputation systems. We also introduce the design, architecture, and implementation of a flexible, general-purpose framework, called Pythia, for building reputation systems. We give a sample application of our framework to illustrate its use.

Reputation-management, as proposed for dynamic and open systems aims to provide mechanism for analysing the behaviour of agents, and to distribute this information so that the impact of the actions of those acting against the interests of a community can be limited. We study the assumptions that underpin this decisionmaking role for reputation-management and highlight its limitations with regar...

In e-commerce environments, the trustworthiness of a seller is utterly important to potential buyers, especially when the seller is unknown to them. Most existing trust evaluation models compute a single value to reflect the general trust level of a seller without taking any transaction context information into account. With such a result as the indication of reputation, a buyer may be easily d...

The aggregation of conflicting preferences is an important issue in human society and multiagent systems. Due to its universality, voting among a set of alternatives has a central role among preference aggregation mechanisms. We consider the most general case of voting in which the voters’ rankings of alternatives are mapped to a collective ranking of alternatives by a so-called social welfare ...

<span lang="EN-US">Wireless sensor networks (WSNs) comprise a huge number of sensors that sense real-time data; in general, WSNs are designed for monitoring various application mainly internet things based (IoT) application. Moreover, these possess certain amount energy i.e., they battery based; thus, the network model must be efficient. Furthermore, data aggregation is mechanism minimize...

Nowadays more and more Internet applications install reputation systems to collect opinions users have about some reputation objects. The opinions are usually formalized in the form of ratings the reputation system can use to build overall reputation profiles of the reputation objects. Reputation objects might be other users, products, web content and anything else that can be rated. Users may ...

Trust and reputation systems are widely employed in WSNs in order to help decision making processes by assessing trustworthiness of sensor nodes in a data aggregation process. However, in unattended and hostile environments, some sophisticated malicious attacks such as collusion attacks can distort the computed trust scores and lead to low quality or deceptive services as well as to undermine t...