no code implementations • 3 Mar 2022 • Charilaos Akasiadis, Evgenios Kladis, Evangelos Michelioudakis, Elias Alevizos, Alexander Artikis
Our goal is to provide a framework for the evaluation and comparison of ETSC algorithms and to obtain intuition on how such approaches perform on real-life applications.
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 • 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.
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.
no code implementations • 19 Sep 2020 • Francesco Ricca, Alessandra Russo, Sergio Greco, Nicola Leone, Alexander Artikis, Gerhard Friedrich, Paul Fodor, Angelika Kimmig, Francesca Lisi, Marco Maratea, Alessandra Mileo, Fabrizio Riguzzi
Since the first conference held in Marseille in 1982, ICLP has been the premier international event for presenting research in logic programming.
no code implementations • 11 May 2020 • Giannis Fikioris, Kostas Patroumpas, Alexander Artikis
We take into account the type of each vessel in order to provide a suitable configuration that can yield improved trajectory synopses, both in terms of approximation error and compression ratio.
no code implementations • 25 Jul 2019 • Efthimis Tsilionis, Nikolaos Koutroumanis, Panagiotis Nikitopoulos, Christos Doulkeridis, Alexander Artikis
We present a system for online composite event recognition over streaming positions of commercial vehicles.
no code implementations • 7 Mar 2019 • Manolis Pitsikalis, Alexander Artikis, Richard Dreo, Cyril Ray, Elena Camossi, Anne-Laure Jousselme
Maritime monitoring systems support safe shipping as they allow for the real-time detection of dangerous, suspicious and illegal vessel activities.
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 • 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.
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 • 22 Jan 2016 • Kostas Patroumpas, Elias Alevizos, Alexander Artikis, Marios Vodas, Nikos Pelekis, Yannis Theodoridis
We present a system for online monitoring of maritime activity over streaming positions from numerous vessels sailing at sea.
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.
1 code implementation • 24 Feb 2014 • Nikos Katzouris, Alexander Artikis, George Paliouras
Ideally, systems that learn from temporal data should be able to operate in an incremental mode, that is, revise prior constructed knowledge in the face of new evidence.
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.