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Complex Event Recognition Group

National Center for Scientific Research Demokritos
We are Hiring
BSc & MSc Topics

Latest News

Our paper “A Tensor-Based Probabilistic Event Calculus” was accepted at KR 2025.
Our paper “Sequencing in the Run-Time Event Calculus” was accepted at ECAI 2025.
Our paper “Run-Time Adaptation of Complex Event Forecasting” was accepted at DEBS 2025. PDF code
Our paper “Generating Activity Definitions with Large Language Models.” was accepted at EDBT 2025. PDF code BibTeX
Efthimis Tsilionis successfully defended his PhD thesis, entitled "Scalable Complex Event Recognition". Slides

About the CER Group


We have been developing formal computational methods which take as input streams of low-level events, e.g. sensor-based events, such as a change in temperature, and combine them to infer complex high-level events of interest, such as the start of a fire incident or a fault in the cooling system of a vehicle. Our methods support real-time event recognition over high-velocity data streams, online structure learning for accurate event recognition over noisy relational streams, as well as complex event forecasting for proactive decision-making. Below are some applications in which we have applied our methods. An overview of our research activities may be found in this paper and this presentation.

Transport
Mobility
Analyze vehicle position streams for real-time fleet management.