81 citations · 225 across the 21 of their papers we have counts for
21 papers
Can Language Models Analyze Data? Evaluating Large Language Models for Question Answering over Datasets
Andreas Xenofontos, Pavlos Fafalios
This paper investigates the effectiveness of large language models (LLMs) in answering questions over datasets. We examine their performance in two scenarios: (a) directly answerin…
FastCat Catalogues: Interactive Entity-based Exploratory Analysis of Archival Documents
Georgios Rinakakis, Kostas Petrakis, Yannis Tzitzikas +1
We describe FastCat Catalogues, a Web application that supports researchers studying archival material, such as historians, in exploring and quantitatively analysing the data (tran…
A Workflow Model for Holistic Data Management and Semantic Interoperability in Quantitative Archival Research
Pavlos Fafalios, Yannis Marketakis, Anastasia Axaridou +2
Archival research is a complicated task that involves several diverse activities for the extraction of evidence and knowledge from a set of archival documents. The involved activit…
The SeaLiT Ontology -- An Extension of CIDOC-CRM for the Modeling and Integration of Maritime History Information
Pavlos Fafalios, Athina Kritsotaki, 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 ontol…
Estimating the Cost of Executing Link Traversal based SPARQL Queries
Antonis Sklavos, Pavlos Fafalios, Yannis Tzitzikas
An increasing number of organisations in almost all fields have started adopting semantic web technologies for publishing their data as open, linked and interoperable (RDF) dataset…
Towards Semantic Interoperability in Historical Research: Documenting Research Data and Knowledge with Synthesis
Pavlos Fafalios, Konstantina Konsolaki, Lida Charami +6
A vast area of research in historical science concerns the documentation and study of artefacts and related evidence. Current practice mostly uses spreadsheets or simple relational…
FAST CAT: Collaborative Data Entry and Curation for Semantic Interoperability in Digital Humanities
Pavlos Fafalios, Kostas Petrakis, Georgios Samaritakis +4
Descriptive and empirical sciences, such as History, are the sciences that collect, observe and describe phenomena in order to explain them and draw interpretative conclusions abou…
Better Together -- An Ensemble Learner for Combining the Results of Ready-made Entity Linking Systems
Renato Stoffalette João, Pavlos Fafalios, Stefan Dietze
Entity linking (EL) is the task of automatically identifying entity mentions in text and resolving them to a corresponding entity in a reference knowledge base like Wikipedia. Thro…
Exploiting stance hierarchies for cost-sensitive stance detection of Web documents
Arjun Roy, Pavlos Fafalios, Asif Ekbal +2
Fact checking is an essential challenge when combating fake news. Identifying documents that agree or disagree with a particular statement (claim) is a core task in this process. I…
TweetsCOV19 -- A Knowledge Base of Semantically Annotated Tweets about the COVID-19 Pandemic
Dimitar Dimitrov, Erdal Baran, Pavlos Fafalios +4
Publicly available social media archives facilitate research in the social sciences and provide corpora for training and testing a wide range of machine learning and natural langua…
Bias in Data-driven AI Systems -- An Introductory Survey
Eirini Ntoutsi, Pavlos Fafalios, Ujwal Gadiraju +20
AI-based systems are widely employed nowadays to make decisions that have far-reaching impacts on individuals and society. Their decisions might affect everyone, everywhere and any…
How Many and What Types of SPARQL Queries can be Answered through Zero-Knowledge Link Traversal?
Pavlos Fafalios, Yannis Tzitzikas
The current de-facto way to query the Web of Data is through the SPARQL protocol, where a client sends queries to a server through a SPARQL endpoint. Contrary to an HTTP server, pr…
Same but Different: Distant Supervision for Predicting and Understanding Entity Linking Difficulty
Renato Stoffalette João, Pavlos Fafalios, Stefan Dietze
Entity Linking (EL) is the task of automatically identifying entity mentions in a piece of text and resolving them to a corresponding entity in a reference knowledge base like Wiki…
Tracking the History and Evolution of Entities: Entity-centric Temporal Analysis of Large Social Media Archives
Pavlos Fafalios, Vasileios Iosifidis, Kostas Stefanidis +1
How did the popularity of the Greek Prime Minister evolve in 2015? How did the predominant sentiment about him vary during that period? Were there any controversial sub-periods? Wh…
Building and Querying Semantic Layers for Web Archives (Extended Version)
Pavlos Fafalios, Helge Holzmann, Vaibhav Kasturia +1
Web archiving is the process of collecting portions of the Web to ensure that the information is preserved for future exploitation. However, despite the increasing number of web ar…
Towards a Ranking Model for Semantic Layers over Digital Archives
Pavlos Fafalios, Vaibhav Kasturia, Wolfgang Nejdl
Archived collections of documents (like newspaper archives) serve as important information sources for historians, journalists, sociologists and other interested parties. Semantic…
Ranking Archived Documents for Structured Queries on Semantic Layers
Pavlos Fafalios, Vaibhav Kasturia, Wolfgang Nejdl
Archived collections of documents (like newspaper and web archives) serve as important information sources in a variety of disciplines, including Digital Humanities, Historical Sci…
Viewpoint Discovery and Understanding in Social Networks
Mainul Quraishi, Pavlos Fafalios, Eelco Herder
The Web has evolved to a dominant platform where everyone has the opportunity to express their opinions, to interact with other users, and to debate on emerging events happening ar…
TweetsKB: A Public and Large-Scale RDF Corpus of Annotated Tweets
Pavlos Fafalios, Vasileios Iosifidis, Eirini Ntoutsi +1
Publicly available social media archives facilitate research in a variety of fields, such as data science, sociology or the digital humanities, where Twitter has emerged as one of…
Time-Aware and Corpus-Specific Entity Relatedness
Nilamadhaba Mohapatra, Vasileios Iosifidis, Asif Ekbal +2
Entity relatedness has emerged as an important feature in a plethora of applications such as information retrieval, entity recommendation and entity linking. Given an entity, for i…
Heuristics-based Query Reordering for Federated Queries in SPARQL 1.1 and SPARQL-LD
Thanos Yannakis, Pavlos Fafalios, Yannis Tzitzikas
The federated query extension of SPARQL 1.1 allows executing queries distributed over different SPARQL endpoints. SPARQL-LD is a recent extension of SPARQL 1.1 which enables to dir…