Christos Chronis

dblp:265/7847 · DBLP profile ↗
← Back
4ranked-venue papers in the field
2as first author
4since 2021 · last 2026
0000-0002-2768-7119ORCID · verified

Domains — venue-derived; a paper can count in several

Big Data, Cloud & Distributed Data Systems · 2 (1 first)Database Systems & Data Management · 1 (1 first)Other / Interdisciplinary · 1
YearPublicationVenuePosition
2026 Learning Compressed AIS Trajectories with VQ-VAE for Activity Classification
Christos Chronis, Spyridon Chatziargyros, Magdalini Eirinaki, Konstantinos Tserpes, Iraklis Varlamis
MDM1
2024 Privacy-Preserving Energy Recommendations Using Federated Learning and Local LLMs on the Edge
abstract
Effective energy management in households is critical to achieving overall energy efficiency and sustainability goals. This study introduces a novel approach to predicting short-term energy consumption for households using federated learning (FL) models. The approach achieves short-term energy consumption predictions (i.e. for the next 10 minutes) by analyzing local data, such as the current watt consumption and activated devices. The key innovation in this approach is the use of privacy-preserving machine learning techniques, ensuring that personal data is never shared during the training process. The models are used to predict potential spikes in energy demand, allowing for proactive management. In addition, a local Large Language Model (LLM) is integrated to generate personalized recommendations for users, aimed at avoiding predicted consumption spikes and promoting energy-efficient behavior. This approach not only preserves user privacy but also enhances user engagement by providing actionable insights based on local consumption patterns.
Christos Chronis, Iraklis Varlamis, George Dimitrakopoulos 0001, Faycal Bensaali, Georgios Th. Papadopoulos
BDCAT1
2024 Entity Extraction from High-Level Corruption Schemes via Large Language Models
abstract
The rise of financial crime that has been observed in recent years has created an increasing concern around the topic and many people, organizations and governments are more and more frequently trying to combat it. Despite the increase of interest in this area, there is a lack of specialized datasets that can be used to train and evaluate works that try to tackle those problems. This article proposes a new micro-benchmark dataset for algorithms and models that identify individuals and organizations, and their multiple writings, in news articles, and presents an approach that assists in its creation. Experimental efforts are also reported, using this dataset, to identify individuals and organizations in financial-crime-related articles using various low-billion parameter Large Language Models (LLMs). For these experiments, standard metrics (Accuracy, Precision, Recall, F1 Score) are reported and various prompt variants comprising the best practices of prompt engineering are tested. In addition, to address the problem of ambiguous entity mentions, a simple, yet effective LLM-based disambiguation method is proposed, ensuring that the evaluation aligns with reality. Finally, the proposed approach is compared against a widely used stateof-the-art open-source baseline, showing the superiority of the proposed method.
Panagiotis Koletsis, Panagiotis-Konstantinos Gemos, Christos Chronis, Iraklis Varlamis, Vasilis Efthymiou, Georgios Th. Papadopoulos
IEEE Big Data3
2021 The emergence of explainability of intelligent systems: Delivering explainable and personalized recommendations for energy efficiency
abstract
The recent advances in artificial intelligence namely in machine learning and deep learning, have boosted the performance of intelligent systems in several ways. This gave rise to human expectations, but also created the need for a deeper understanding of how intelligent systems think and decide. The concept of explainability appeared, in the extent of explaining the internal system mechanics in human terms. Recommendation systems are intelligent systems that support human decision making, and as such, they have to be explainable to increase user trust and improve the acceptance of recommendations. In this study, we focus on a context-aware recommendation system for energy efficiency and develop a mechanism for explainable and persuasive recommendations, which are personalized to user preferences and habits. The persuasive facts either emphasize on the economical saving prospects (Econ) or on a positive ecological impact (Eco) and explanations provide the reason for recommending an energy saving action. Based on a study conducted using a Telegram bot, different scenarios have been validated with actual data and human feedback. Current results show a total increase of 19% on the recommendation acceptance ratio when both economical and ecological persuasive facts are employed. This revolutionary approach on recommendation systems, demonstrates how intelligent recommendations can effectively encourage energy saving behavior.
Christos Sardianos, Iraklis Varlamis, Christos Chronis, George Dimitrakopoulos 0001, Abdullah Alsalemi, Yassine Himeur, Faycal Bensaali, Abbes Amira
Int. J. Intell. Syst.3