This article examines the construct validity of reactive and proactive aggression, as assessed by the teacher-rating scale developed by K. A. Dodge and J. D. Coie (1987). In Study 1 (n = 149 boys), confirmatory factor analyses revealed that a 2-factor model, in which a substantial correlation was observed between the 2 latent factors, presented a better fit than a single-factor model. Study 2 (...

This PhD thesis addresses the following problem: exploiting of trust information in order to enhance the accuracy and the user acceptance of current Recommender Systems (RS). RSs suggest to users items they will probably like. Up to now, current RSs mainly generate recommendations based on users’ opinions on items. Nowadays, with the growth of online communities, emarketplaces, weblogs and peer...

Networked virtual environments (VEs) such as Massively Multiplayer Online Games (MMOGs) have become very popular in recent years. However, existing client-server architectures suffer from resource constrains when the number of concurrent users increases. Research on peer-to-peer virtual environments (P2P-VEs) thus tries to create more scalable and affordable VEs via the resource sharing of mutu...

Instant quality feedback in the form of online peer ratings is a prominent feature of modern massive online social networks (MOSNs). It allows network members to indicate their appreciation of a post, comment, photograph, etc. Some MOSNs support both positive and negative (signed) ratings. In this study, we rated 11 thousand MOSN member profiles and collected user responses to the ratings. MOSN...

Based on social influence theory, we develop a model in which the use of peer intimidation by Machiavellian employees results in greater promotability ratings by supervisors. However, consistent with interdependence theory, we expect that this process is qualified by job autonomy and the political skill of the supervisor making the promotability rating. Based on a sample of 204 supervisor–subor...

The support deterioration model of depression states that stress deteriorates the perceived availability and/or effectiveness of social support, which then leads to depression. The present study examined this model in adolescent depression following parent-perpetrated maltreatment and peer-perpetrated bullying, as assessed by a rigorous contextual interview and rating system. In 101 depressed a...

Selecting the appropriate manufacturing machine is a very important and complex problem for firms which usually have to deal with both qualitative and quantitative criteria and involve different decision makers whose knowledge is often vague and imprecise. This paper proposes a peer-based modification to intuitionistic fuzzy multi-criteria group decision making with TOPSIS method (peer IF-TOPSI...

In Peer-to-Peer (P2P) file sharing systems, peers spend a significant amount of time looking for relevant and interesting files. However, the files available for download represent on one hand a rich collection for different needs and preferences and on the other hand a struggle for the peers to find files that they like. In this paper, we propose new recommender schemes based on collaborative ...

Due to the spread of distributed systems, a number of agent systems have been developed. Since most existing multiagent systems implement different agent platforms (AP), it is extremely hard to get heterogeneous agents to work together. In this paper, we introduce a new network protocol called Agent Platform Protocol (APP), which is designed to meet the exact demands of agent interaction over w...

The large majority of reputation systems use features such as star ratings and reviews to give users a reputation in online peer-to-peer markets. Both have been shown to be effective for signaling trustworthiness. However, the exact extent to which these features can change perceptions of users’ trustworthiness remains an open question. Using data from an online experiment conducted on Airbnb u...