Search results for " social network"

Knowledge Extraction from Biological and Social Graphs

2022

Many problems from the real life deal with the generation of enormous, varied, dynamic, and interconnected datasets coming from different and heterogeneous sources. This PhD Thesis focuses on the proposal of novel knowledge extraction techniques from graphs, mainly based on Big Data methodologies. Two application contexts are considered: Biological and Medical data, with the final aim of identifying biomarkers for diagnosis, treatment, prognosis, and prevention of diseases. Social data, for the optimization of advertising campaigns, the comparison of user profiles, and neighborhood analysis.

The Whole Is Greater than the Sum of the Parts: A Multilayer Approach on Criminal Networks

2022

Traditional social network analysis can be generalized to model some networked systems by multilayer structures where the individual nodes develop relationships in multiple layers. A multilayer network is called multiplex if each layer shares at least one node with some other layer. In this paper, we built a unique criminal multiplex network from the pre-trial detention order by the Preliminary Investigation Judge of the Court of Messina (Sicily) issued at the end of the Montagna anti-mafia operation in 2007. Montagna focused on two families who infiltrated several economic activities through a cartel of entrepreneurs close to the Sicilian Mafia. Our network possesses three layers which sha…

Analysis of Users Behaviour from a Movie Preferences Perspective

2018

Despite their tremendous popularity, Online Social Networks (OSNs) have several issues related to the privacy of social users. These issues have motivated researchers to develop OSN services that take advantage of the decentralized platforms (such as P2P systems or opportunistic networks). Decentralized Online Social Networks (DOSNs) need specific approaches to manage the decentralization of social data. In particular, data availability is one of the main issues and current proposals exploit properties of the social relationships to manage it. At the best of our knowledge, there are no proposals which exploit similarity between users, expressed with the term homophily. Homophily has been we…

Exploiting community detection to recommend privacy policies in decentralized online social networks

2018

The usage of Online Social Networks (OSNs) has become a daily activity for billions of people that share their contents and personal information with the other users. Regardless of the platform exploited to provide the OSNs’ services, these contents’ sharing could expose the OSNs’ users to a number of privacy risks if proper privacy-preserving mechanisms are not provided. Indeed, users must be able to define its own privacy policies that are exploited by the OSN to regulate access to the shared contents. To reduce such users’ privacy risks, we propose a Privacy Policies Recommended System (PPRS) that assists the users in defining their own privacy policies. Besides suggesting the most appro…

Correlation-Based Similarity Metric For Clustering In Multimedia Social Network

2011

A Novel Recruitment Policy to Defend against Sybils in Vehicular Crowdsourcing

2021

Vehicular Social Networks (VSNs) is an emerging communication paradigm, derived by merging the concepts of Online Social Networks (OSNs) and Vehicular Ad-hoc Networks (VANETs). Due to the lack of robust authentication mechanisms, social-based vehicular applications are vulnerable to numerous attacks including the generation of sybil entities in the networks. We address this important issue in vehicular crowdsourcing campaigns where sybils are usually employed to increase their influence and worsen the functioning of the system. In particular, we propose a novel User Recruitment Policy (URP) that, after extracting the participants within the event radius of a crowdsourcing campaign, detects …

La libertà di espressione in rete fra content moderation dei social network e regolazione dell’Unione Europea

2022

Starting from the premise that digital society and advances in technology determine the need for adaptation, even if only in an interpretative sense, of the legal categories of constitutionalism, the study analyzes the new dimension of the freedom of expression of thought in the "digital environment". Through the examination of the different jurisprudential approaches expressed to protect this freedom in Europe and in the United States, the work also examines the role of social platforms, their power of self-regulation and that of content moderation, which will highlight the need for regulation of the phenomenon that balances the needs of protection of rights and those of technological adva…

La libertà di espressione nell’era dei social network fra content moderation e necessità di una regolazione flessibile

2023

Starting from the premise that digital society and advances in technology determine the need for adaptation, even if only in an interpretative sense, of the legal categories of constitutionalism, the study analyzes the new dimension of the freedom of expression of thought in the “digital environment”. Through the examination of the different jurisprudential approaches expressed to protect this freedom in Europe and in the United States, the work also examines the role of social platforms, their power of self-regulation and that of content moderation, which will highlight the need for regulation of the phenomenon that balances the needs of protection of rights and those of technological adva…

Significati vecchi e nuovi di ideologia: una rassegna

2020

Old ideologies, defined as «grand narratives», seem to have faded away, but this is not a conclusive argument to state that ideology has, itself, disappeared. In fact, there are strong reasons to believe that it has not. In the first part, this article offers a synthetic survey of some of the most significant conceptions of ideology in order to avoid the confusion generated by uncritical uses of the term. The vantage point of the analysis is the fundamental conceptual opposition between «ideology» and «praxis» («truth», or «reality»). The second part of the article opens up some questions about how the new forms of ideology may thrive in the new spaces created by the communication technolog…

FACEBOOK AT THE TIME OF "DIGITAL NATIVES": TEACHING SPANISH THROUGH SOCIAL NETWORKS

2015

Language acquisition is a process which is influenced by cognitive, attitudinal, demographic, linguistic and experiential factors. At the time of globalization, structural change occurred with the advent of the technological revolution, the subsequent introduction of innovative tools in teaching, have transformed the concept of learning. At the web's century youngers, "digital natives", are creating a kind of "parallel school" not only to access to knowledge, to collaborate with users and discuss, but also to teach and learn languages through social networks, blogs, fora and communities, as if they were in a virtual classroom. As to the acquisition of Spanish as a L2, analysing the most rec…