Pavlos Fafalios

Dr. Pavlos Fafalios

FORTH-ICS
orcid

Research Focus & Metrics

Academic Career Length

10Years (2017-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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3 February 2020 in WIREs Data Mining and Knowledge Discovery
Verified
Journal Article
Open access
PDF file
ENEirini Ntoutsi
Eirini Ntoutsi
PFPavlos Fafalios
Pavlos Fafalios
UGUjwal Gadiraju
Ujwal Gadiraju
VIVasileios Iosifidis
Vasileios Iosifidis
WNWolfgang Nejdl
Wolfgang Nejdl
SSSteffen Staab
Steffen Staab
Artificial Intelligence (AI)‐based systems are widely employed nowadays to make decisions that have far‐reaching impact on individuals and society. Their decisions might affect everyone, everywhere, and anytime, entailing concerns about potential human rights issues. Therefore, it is necessary to move beyond traditional AI algorithms optimized for predictive performance and embed ethical and legal principles in their design, training, and deployment to ensure social good while still benefiting from the huge potential of the AI technology. The goal of this survey is to provide a broad multidisciplinary overview of the area of bias in AI systems, focusing on technical challenges and solutions as well as to suggest new research directions towards approaches well‐grounded in a legal frame. In this survey, we focus on data‐driven AI, as a large part of AI is powered nowadays by (big) data and powerful machine learning algorithms. If otherwise not specified, we use the general term bias to describe problems related to the gathering or processing of data that might result in prejudiced decisions on the bases of demographic features such as race, sex, and so forth.This article is categorized under: Commercial, Legal, and Ethical Issues > Fairness in Data Mining Commercial, Legal, and Ethical Issues > Ethical Considerations Commercial, Legal, and Ethical Issues > Legal Issues

17 October 2019
Verified
Book Chapter
Open access
PDF file
ATAndon Tchechmedjiev
Andon Tchechmedjiev
PFPavlos Fafalios
Pavlos Fafalios
KBKatarina Boland
Katarina Boland
MGMalo Gasquet
Malo Gasquet
MZMatthäus Zloch
Matthäus Zloch
KTKonstantin Todorov
Konstantin Todorov
Various research areas at the intersection of computer and social sciences require a ground truth of contextualized claims labelled with their truth values in order to facilitate supervision, validation or reproducibility of approaches dealing, for example, with fact-checking or analysis of societal debates. So far, no reasonably large, up-to-date and queryable corpus of structured information about claims and related metadata is publicly available. In an attempt to fill this gap, we introduce ClaimsKG, a knowledge graph of fact-checked claims, which facilitates structured queries about their truth values, authors, dates, journalistic reviews and other kinds of metadata. ClaimsKG is generated through a semi-automated pipeline, which harvests data from popular fact-checking websites on a regular basis, annotates claims with related entities from DBpedia, and lifts the data to RDF using an RDF/S model that makes use of established vocabularies. In order to harmonise data originating from diverse fact-checking sites, we introduce normalised ratings as well as a simple claims coreference resolution strategy. The current knowledge graph, extensible to new information, consists of 28,383 claims published since 1996, amounting to 6,606,032 triples.

3 June 2018
Verified
Book Chapter
Closed access
PDF file
PFPavlos Fafalios
Pavlos Fafalios
VIVasileios Iosifidis
Vasileios Iosifidis
ENEirini Ntoutsi
Eirini Ntoutsi
SDStefan Dietze
Stefan Dietze

7 July 2022 in Heritage
Verified
Journal Article
Open access
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Yannis TzitzikasYannis Tzitzikas
Yannis Tzitzikas
Michalis MountantonakisMichalis Mountantonakis
Michalis Mountantonakis
PFPavlos Fafalios
Pavlos Fafalios
YMYannis Marketakis
Yannis Marketakis
The CIDOC Conceptual Reference Model (CIDOC-CRM) is an ISO Standard ontology for the cultural domain that is used for enabling semantic interoperability between museums, libraries, archives and other cultural institutions. For leveraging CIDOC-CRM, several processes and tasks have to be carried out. It is therefore important to investigate to what extent we can automate these processes in order to facilitate interoperability. For this reason, in this paper, we describe the related tasks, and we survey recent works that apply machine learning (ML) techniques for reducing the costs related to CIDOC-CRM-based compliance and interoperability. In particular, we (a) analyze the main processes and tasks, (b) identify tasks where the recent advances of ML (including Deep Learning) would be beneficial, (c) identify cases where ML has been applied (and the results are successful/promising) and (d) suggest tasks that can benefit from applying ML. Finally, since the approaches that leverage both CIDOC-CRM data and ML are few in number, (e) we introduce our vision for the given topic, and (f) we provide a list of open CIDOC-CRM datasets that can be potentially used for ML tasks.

9 August 2023 in Journal on Computing and Cultural Heritage
Verified
Journal Article
Open access
PFPavlos Fafalios
Pavlos Fafalios
AKAthina Kritsotaki
Athina Kritsotaki
MDMartin Doerr
Martin Doerr
We describe the construction and use of the SeaLiT Ontology, an extension of the ISO standard CIDOC-CRM for the modelling and integration of maritime history information. The ontology has been developed gradually, following a bottom-up approach that required the analysis of large amounts of real primary data (archival material) as well as knowledge and validation by domain experts (maritime historians). We present the specification of the ontology, RDFS and OWL implementations, as well as knowledge graphs that make use of this data model for integrating information originating from a large and diverse set of archival documents, such as crew lists, sailors registers, naval ship registers, and payrolls. We also describe an application that operates over these knowledge graphs and which supports historians in exploring and quantitatively analysing the integrated data through a user-friendly interface. Finally, we discuss aspects related to the use, evolution, and sustainability of the ontology.

16 July 2021 in Journal on Computing and Cultural Heritage
Verified
Journal Article
Open access
PFPavlos Fafalios
Pavlos Fafalios
KPKostas Petrakis
Kostas Petrakis
GSGeorgios Samaritakis
Georgios Samaritakis
KDKorina Doerr
Korina Doerr
AKAthina Kritsotaki
Athina Kritsotaki
MDMartin Doerr
Martin Doerr
Descriptive and empirical sciences, such as History, are the sciences that collect, observe and describe phenomena to explain them and draw interpretative conclusions about influences, driving forces and impacts under given circumstances. Spreadsheet software and relational database management systems are still the dominant tools for quantitative analysis and overall data management in these these sciences, allowing researchers to directly analyse the gathered data and perform scholarly interpretation. However, this current practice has a set of limitations, including the high dependency of the collected data on the initial research hypothesis, usually useless for other research, the lack of representation of the details from which the registered relations are inferred, and the difficulty to revisit the original data sources for verification, corrections or improvements. To cope with these problems, in this article we present FAST CAT, a collaborative system for assistive data entry and curation in Digital Humanities and similar forms of empirical research. We describe the related challenges, the overall methodology we follow for supporting semantic interoperability, and discuss the use of FAST CAT in the context of a European (ERC) project of Maritime History, called SeaLiT , which examines economic, social and demographic impacts of the introduction of steamboats in the Mediterranean area between the 1850s and the 1920s.