Cyberbullying and traditional bullying in relation with adolescents’ perception of parenting

This study investigates the relation between parenting and involvement in cyberbullying. We predicted that cyberbullies and cyberbully-victims report less responsiveness and de manding reactions from their parents than victims and youthswho are not involved in cyberbullying. Furthermore, we predicted that youths with neglectful parents cyberbully the most often and youth with authoritative parents cyberbully the least. The same differences were predicted for traditional bullying. behavio and for youth involved in both forms of bullying behavior. Participants were made up to 1200 youths from 10-14 years old. They responded to a survey measuring cyberbullying and traditional bullying with questions based on the sub-scales from the Bully?Victim Questionnaire, and parenting with an adjusated version of the Parenting Style Questionnaire. Most results confirm out predictions. Results on authoritative, autoritarian, permissive and neglectful parenting styles suggest that for bullies, demanding actions are an important dimension of thier behavior and for victims, responsiveness is an important dimension of their behavior

A demonstration of Tribler : peer-to-peer television

The success of Peer-to-Peer Television (P2P-TV) systems depends on the inducement of users to cooperate massively and voluntarily. To operationalize our proposed applications of incentives based on psychological backgrounds, we discuss a demonstration of our own P2P-TV system called Tribler. It is a system for downloading, video-on-demand (VoD), and live streaming of Television content. This paper discusses the demonstration of Tribler version 4.0 as the first operationalization of relevant psychological backgrounds

Modelling the Population Dynamics and the File Availability in a BitTorrent-Like P2P System with Decreasing Peer Arrival Rate

Abstract. Many measurement studies of P2P file sharing systems sug-gest that the request rate for a file changes over time and the system is thus non-stationary. For this reason we study the population dynam-ics and the availability of a file in a BitTorrent-like file sharing system, when the arrival rate for file requests decreases exponentially. We study the system first by a deterministic fluid model and then by a more de-tailed Markov chain analysis that allows estimating the life time of a single chunk exactly. Simple approximation for the life time is also de-rived. In addition, we simulate the life time of a file consisting multiple chunks in order to verify the analytical results to be applicable also to a more complex system.

A demonstration of Tribler : peer-to-peer television

The success of Peer-to-Peer Television (P2P-TV) systems depends on the inducement of users to cooperate massively and voluntarily. To operationalize our proposed applications of incentives based on psychological backgrounds, we discuss a demonstration of our own P2P-TV system called Tribler. It is a system for downloading, video-on-demand (VoD), and live streaming of Television content. This paper discusses the demonstration of Tribler version 4.0 as the first operationalization of relevant psychological backgrounds

Exploiting the Synergy Between Gossiping and Structured Overlays

In this position paper we argue for exploiting the synergy between gossip-based algorithms and structured overlay networks (SON). These two strands of research have both aimed at building fault-tolerant, dynamic, self-managing, and large-scale distributed systems. Despite the common goals, the two areas have, however, been relatively isolated. We focus on three problem domains where there is an untapped potential of using gossiping combined with SONs. We argue for applying gossip-based membership for ring-based SONs---such as Chord and Bamboo---to make them handle partition mergers and loopy networks. We argue that small world SONs---such as Accordion and Mercury---are specifically well-suited for gossip-based membership management. The benefits would be better graph-theoretic properties. Finally, we argue that gossip-based algorithms could use the overlay constructed by SONs. For example, many unreliable broadcast algorithms for SONs could be augmented with anti-entropy protocols. Similarly, gossip-based aggregation could be used in SONs for network size estimation and load-balancing purposes

Clustering and Sharing Incentives in BitTorrent Systems

Peer-to-peer protocols play an increasingly instrumental role in Internet content distribution. Consequently, it is important to gain a full understanding of how these protocols behave in practice and how their parameters impact overall performance. We present the first experimental investigation of the peer selection strategy of the popular BitTorrent protocol in an instrumented private torrent. By observing the decisions of more than 40 nodes, we validate three BitTorrent properties that, though widely believed to hold, have not been demonstrated experimentally. These include the clustering of similar-bandwidth peers, the effectiveness of BitTorrent's sharing incentives, and the peers' high average upload utilization. In addition, our results show that BitTorrent's new choking algorithm in seed state provides uniform service to all peers, and that an underprovisioned initial seed leads to the absence of peer clustering and less effective sharing incentives. Based on our observations, we provide guidelines for seed provisioning by content providers, and discuss a tracker protocol extension that addresses an identified limitation of the protocol