Artificial Intelligence

Laboratory

Department of Digital Systems

University of Piraeus

Imitation and Inverse Reinforcement Learning

Our work focuses on developing and evaluating enhanced inverse reinforcement learning and imitation learning methods regarding 4D trajectories, although not only for those trajectories. Thus, we follow a supervised leaning approach, and treat historical data provided by “experts” as demonstrations that a machine learning algorithm …
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Modelling Complex Systems for Decision Making

Modelling (complex) systems for decision making using multi-agent reinforcement learning methods (MARL) for the computation of agents’ joint policies for action in critical domains is a priority and challenge here. Specifically, we aim to resolve cases in large-scale and complex settings where agents have conflicting …
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Multi-Agent Agreements

The computation of agreements – or conventions- in agents’ societies via social learning methods, when agents aim to perform tasks in coordination with others is a challenge, especially when agents have to achieve multiple and conflicting goals simultaneously w.r.t. operational constraints, jointly with their peers, …
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Ontology Alignment and Semantic Integration

Rich and diverse information sources of static or stream structured data do exist. However these are heterogeneous in various aspects: On the ways information is formed, on the ways information is described and shaped, on the ways different aspects of (abstract or concrete) entities are …
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Knowledge Representation and Reasoning with Ontologies

Combining ontologies by discovering semantic associations at any level of abstraction, or decomposing large ontologies in modules w.r.t. logical properties either for re-usability of specifications, efficiency in ontology management, or efficiecy in reasoning, are goals that we need to pursue, especially when we deal with …
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What are we currently working on?

  • TAPAS: Towards an Automated and exPlainable ATM System TAPAS (Towards an Automated and exPlainable ATM System) addresses explicitly the effectiveness of introducing AI/ML solutions in order to increase the levels of automation in ATM, considering the need of the operator to trust the system (taken as the ability to understand and explain its behaviour and outcomes). TAPAS will… Read more…
  • Trajectory Planning for Conflict-free Trajectories: A Multi Agent Reinforcement Learning Approach While data-driven methods aim to build models for trajectory planning and conflicts resolution, incorporating stakeholders’ interests and preferences, the multi-agent reinforcement learning (MARL) approach aims to address complexity phenomena due to traffic and resolve conflicts between multiple trajectories, simultaneously. Towards that goal we aim to formulate the problem as a… Read more…
  • Data-Driven Trajectory Imitation with Reinforcement Learning. Reinforcement Learning, and particularly Q-learning has been studied in the context of predicting trajectories, exploiting historical data about trajectories, enhanced with aircraft intent information . This is a recently-proposed approach whose potential and limitations have been explored by the DART project .  However, exploiting aircraft intent has two major shortcomings:… Read more…
  • datAcron: Big Data Analytics for Time Critical Mobility Forecasting datAcron project is funded by the European Union’s Horizon 2020 Programme under grant agreement No. 687591.datAcron is a research and innovation collaborative project targeting at introducing novel methods to detect threats and abnormal activity of very large numbers of moving entities in large geographic areas. Towards this target, aims to… Read more…
  • DART – Data-Driven Aircraft Trajectory Prediction Research DART (Data-driven AiRcraft Trajectory prediction research) addresses the topic “ER-02-2015 – Data Science in ATM” exploring the applicability of data science and complexity science techniques to the ATM domain. DART delivers an understanding on the suitability of applying big data and agent –based modelling techniques for predicting aircraft trajectories based… Read more…

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