124 citations · 1.2k across the 61 of their papers we have counts for
8 papers · 1 filter
When Two Choices Are not Enough: Balancing at Scale in Distributed Stream Processing
Muhammad Anis Uddin Nasir, Gianmarco De Francisci Morales, Nicolas Kourtellis +1
Carefully balancing load in distributed stream processing systems has a fundamental impact on execution latency and throughput. Load balancing is challenging because real-world wor…
Socially-Aware Distributed Hash Tables for Decentralized Online Social Networks
Muhammad Anis Uddin Nasir, Sarunas Girdzijauskas, Nicolas Kourtellis
Many decentralized online social networks (DOSNs) have been proposed due to an increase in awareness related to privacy and scalability issues in centralized social networks. Such…
Privacy Concerns vs. User Behavior in Community Question Answering
Imrul Kayes, Nicolas Kourtellis, Francesco Bonchi +1
Community-based question answering (CQA) platforms are crowd-sourced services for sharing user expertise on various topics, from mechanical repairs to parenting. While they natural…
Cultures in Community Question Answering
Imrul Kayes, Nicolas Kourtellis, Daniele Quercia +2
CQA services are collaborative platforms where users ask and answer questions. We investigate the influence of national culture on people's online questioning and answering behavio…
Dynamic Matrix Factorization with Priors on Unknown Values
Robin Devooght, Nicolas Kourtellis, Amin Mantrach
Advanced and effective collaborative filtering methods based on explicit feedback assume that unknown ratings do not follow the same model as the observed ones (\emph{not missing a…
The Social World of Content Abusers in Community Question Answering
Imrul Kayes, Nicolas Kourtellis, Daniele Quercia +2
Community-based question answering platforms can be rich sources of information on a variety of specialized topics, from finance to cooking. The usefulness of such platforms depend…
The Power of Both Choices: Practical Load Balancing for Distributed Stream Processing Engines
Muhammad Anis Uddin Nasir, Gianmarco De Francisci Morales, David García-Soriano +2
We study the problem of load balancing in distributed stream processing engines, which is exacerbated in the presence of skew. We introduce Partial Key Grouping (PKG), a new stream…
The Minimum Wiener Connector
Natali Ruchansky, Francesco Bonchi, David Garcia-Soriano +2
The Wiener index of a graph is the sum of all pairwise shortest-path distances between its vertices. In this paper we study the novel problem of finding a minimum Wiener connector:…