no code implementations • 11 Jul 2023 • Anastasios Nentidis, Georgios Katsimpras, Anastasia Krithara, Salvador Lima López, Eulália Farré-Maduell, Luis Gasco, Martin Krallinger, Georgios Paliouras
This is an overview of the eleventh edition of the BioASQ challenge in the context of the Conference and Labs of the Evaluation Forum (CLEF) 2023.
no code implementations • 27 May 2023 • Elias Zavitsanos, Dimitris Mavroeidis, Konstantinos Bougiatiotis, Eirini Spyropoulou, Lefteris Loukas, Georgios Paliouras
In this work, we examine the evaluation process for the task of detecting financial reports with a high risk of containing a misstatement.
1 code implementation • 17 May 2023 • Konstantinos Bougiatiotis, Georgios Paliouras
Most phenomena related to biomedical tasks are inherently complex, and in many cases, are expressed as signals on biomedical Knowledge Graphs (KGs).
2 code implementations • 23 Jan 2023 • Anastasios Nentidis, Thomas Chatzopoulos, Anastasia Krithara, Grigorios Tsoumakas, Georgios Paliouras
Conclusion: The results suggest that concept occurrence is a strong heuristic for refining the coarse-grained labels at the level of MeSH concepts and the proposed method improves it further.
no code implementations • 13 Oct 2022 • Anastasios Nentidis, Georgios Katsimpras, Eirini Vandorou, Anastasia Krithara, Antonio Miranda-Escalada, Luis Gasco, Martin Krallinger, Georgios Paliouras
This paper presents an overview of the tenth edition of the BioASQ challenge in the context of the Conference and Labs of the Evaluation Forum (CLEF) 2022.
1 code implementation • 14 Sep 2022 • Konstantinos Bougiatiotis, Georgios Paliouras
In this work, we propose a novel representation of complex multi-relational networks, which is compact and allows very efficient network analysis.
no code implementations • 31 Aug 2022 • Nikos Katzouris, Georgios Paliouras
Complex Event Recognition and Forecasting (CER/F) techniques attempt to detect, or even forecast ahead of time, event occurrences in streaming input using predefined event patterns.
no code implementations • ACL 2022 • Georgios Katsimpras, Georgios Paliouras
In this study, we propose a new method to predict the effectiveness of an intervention in a clinical trial.
1 code implementation • ACL 2022 • Lefteris Loukas, Manos Fergadiotis, Ilias Chalkidis, Eirini Spyropoulou, Prodromos Malakasiotis, Ion Androutsopoulos, Georgios Paliouras
We, therefore, introduce XBRL tagging as a new entity extraction task for the financial domain and release FiNER-139, a dataset of 1. 1M sentences with gold XBRL tags.
1 code implementation • 12 Dec 2021 • Andreas Kontogiannis, Dimitrios Kelesis, Vasilis Pollatos, Georgios Paliouras, George Giannakopoulos
A focused crawler aims at discovering as many web pages relevant to a target topic as possible, while avoiding irrelevant ones.
1 code implementation • 8 Oct 2021 • Elias Alevizos, Alexander Artikis, Georgios Paliouras
We show how SRA can be used in Complex Event Recognition in order to detect patterns upon streams of events, using our framework that provides declarative and compositional semantics, and that allows for a systematic treatment of such automata.
no code implementations • 29 Sep 2021 • Nikolaos Manginas, Prodromos Malakasiotis, Eirini Spyropoulou, Ion Androutsopoulos, Georgios Paliouras
Black-box decision models have been widely adopted both in industry and academia due to their excellent performance across many challenging tasks and domains.
no code implementations • 1 Sep 2021 • Elias Alevizos, Alexander Artikis, Georgios Paliouras
In particular, prediction suffix trees, being variable-order Markov models, have the ability to capture long-term dependencies in a stream by remembering only those past sequences that are informative enough.
no code implementations • 28 Jun 2021 • Anastasios Nentidis, Anastasia Krithara, Konstantinos Bougiatiotis, Martin Krallinger, Carlos Rodriguez-Penagos, Marta Villegas, Georgios Paliouras
In this paper, we present an overview of the eighth edition of the BioASQ challenge, which ran as a lab in the Conference and Labs of the Evaluation Forum (CLEF) 2020.
no code implementations • 28 Jun 2021 • Anastasios Nentidis, Georgios Katsimpras, Eirini Vandorou, Anastasia Krithara, Luis Gasco, Martin Krallinger, Georgios Paliouras
Advancing the state-of-the-art in large-scale biomedical semantic indexing and question answering is the main focus of the BioASQ challenge.
no code implementations • 1 Jun 2021 • Anastasios Nentidis, Anastasia Krithara, Grigorios Tsoumakas, Georgios Paliouras
In this document, we report an analysis of the Public MeSH Note field of the new descriptors introduced in the MeSH thesaurus between 2006 and 2020.
1 code implementation • 31 Mar 2021 • Nikos Katzouris, Alexander Artikis, Georgios Paliouras
Complex Event Recognition (CER) systems detect event occurrences in streaming time-stamped input using predefined event patterns.
1 code implementation • 25 Mar 2021 • Charilaos Akasiadis, Miguel Ponce-de-Leon, Arnau Montagud, Evangelos Michelioudakis, Alexia Atsidakou, Elias Alevizos, Alexander Artikis, Alfonso Valencia, Georgios Paliouras
The main challenges are first to calibrate the simulators so as to reproduce real-world cases, and second, to search for specific values of the parameter space concerning effective drug treatments.
1 code implementation • 20 Jan 2021 • Anastasios Nentidis, Anastasia Krithara, Grigorios Tsoumakas, Georgios Paliouras
To this end, we propose a framework to categorize new descriptors based on their current relation to older descriptors.
no code implementations • 16 Jun 2020 • Anastasios Nentidis, Konstantinos Bougiatiotis, Anastasia Krithara, Georgios Paliouras
The results of the seventh edition of the BioASQ challenge are presented in this paper.
1 code implementation • 15 May 2020 • Anastasios Nentidis, Anastasia Krithara, Grigorios Tsoumakas, Georgios Paliouras
To this end, we propose a new method that uses weak supervision to train a concept annotator on the literature available for a particular disease.
2 code implementations • 18 Dec 2019 • Anastasios Nentidis, Konstantinos Bougiatiotis, Anastasia Krithara, Georgios Paliouras
In biomedical research, unified access to up-to-date domain-specific knowledge is crucial, as such knowledge is continuously accumulated in scientific literature and structured resources.
1 code implementation • 11 Aug 2019 • Frosso Papanastasiou, Georgios Katsimpras, Georgios Paliouras
As the detection of fake news is increasingly considered a technological problem, it has attracted considerable research.
no code implementations • 24 Jul 2019 • Georgios Katsimpras, Georgios Paliouras
This paper proposes a method to guide tensor factorization, using class labels.
no code implementations • 16 Dec 2018 • Elias Alevizos, Alexander Artikis, Georgios Paliouras
Complex Event Processing (CEP) systems have appeared in abundance during the last two decades.
no code implementations • WS 2018 • Anastasios Nentidis, Anastasia Krithara, Konstantinos Bougiatiotis, Georgios Paliouras, Ioannis Kakadiaris
This paper presents the results of the sixth edition of the BioASQ challenge.
no code implementations • 27 Apr 2018 • Elias Alevizos, Alexander Artikis, Georgios Paliouras
We present a system for online probabilistic event forecasting.
1 code implementation • 1 Mar 2018 • Evangelos Michelioudakis, Alexander Artikis, Georgios Paliouras
Online structure learning approaches, such as those stemming from Statistical Relational Learning, enable the discovery of complex relations in noisy data streams.
no code implementations • 12 Feb 2018 • Elias Alevizos, Alexander Artikis, Nikos Katzouris, Evangelos Michelioudakis, Georgios Paliouras
The Complex Event Recognition (CER) group is a research team, affiliated with the National Centre of Scientific Research "Demokritos" in Greece.
no code implementations • WS 2017 • Anastasios Nentidis, Konstantinos Bougiatiotis, Anastasia Krithara, Georgios Paliouras, Ioannis Kakadiaris
The goal of the BioASQ challenge is to engage researchers into creating cuttingedge biomedical information systems.
1 code implementation • 5 May 2017 • Nikos Katzouris, Alexander Artikis, Georgios Paliouras
Logic-based event recognition systems infer occurrences of events in time using a set of event definitions in the form of first-order rules.
no code implementations • 8 Mar 2017 • Alain Kibangou, Alexander Artikis, Evangelos Michelioudakis, Georgios Paliouras, Marius Schmitt, John Lygeros, Chris Baber, Natan Morar, Fabiana Fournier, Inna Skarbovsky
Traffic on freeways can be managed by means of ramp meters from Road Traffic Control rooms.
1 code implementation • 30 Jul 2016 • Nikos Katzouris, Alexander Artikis, Georgios Paliouras
The Event Calculus is a temporal logic that has been used as a basis in event recognition applications, providing among others, direct connections to machine learning, via Inductive Logic Programming (ILP).
no code implementations • 20 May 2015 • Alexander Artikis, Marek Sergot, Georgios Paliouras
Systems for symbolic event recognition accept as input a stream of time-stamped events from sensors and other computational devices, and seek to identify high-level composite events, collections of events that satisfy some pattern.
no code implementations • 9 May 2015 • Aris Kosmopoulos, Georgios Paliouras, Ion Androutsopoulos
Hierarchies are frequently used for the organization of objects.
2 code implementations • 28 Jun 2013 • Aris Kosmopoulos, Ioannis Partalas, Eric Gaussier, Georgios Paliouras, Ion Androutsopoulos
Hierarchical classification addresses the problem of classifying items into a hierarchy of classes.
1 code implementation • 13 Jul 2012 • Anastasios Skarlatidis, Georgios Paliouras, Alexander Artikis, George A. Vouros
In a typical event recognition application, however, these systems often have to deal with a significant amount of uncertainty.
2 code implementations • 9 Apr 2012 • Anastasios Skarlatidis, Alexander Artikis, Jason Filippou, Georgios Paliouras
The input of our system is a set of time-stamped short-term activities (STA) detected on video frames.