Publications

@article{roumeliotis2026agantic,

title = {Agentic AI with Orchestrator-Agent Trust: A Modular Visual Classification Framework with Trust-Aware Orchestration and RAG-Based Reasoning},

author = {Konstantinos I. Roumeliotis and Ranjan Sapkota and Manoj Karkee and Nikolaos D. Tselikas},

year  = {2026},

date = {2026-01-01},

urldate = {2026-01-01},

journal = {IEEE Access},

publisher = {IEEE},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Soumplis:25,

title = {Enabling extended access aggregation with light-trees and point-to-multipoint coherent transceivers},

author = {Polyzois Soumplis and Konstantinos Christodoulopoulos and Panagiotis Kokkinos and A. Napoli and M. Hosseini and Konstantinos Yiannopoulos and Emmanouel (Manos) Varvarigos},

url = {https://opg.optica.org/jocn/abstract.cfm?URI=jocn-17-4-249},

doi = {10.1364/JOCN.542492},

year  = {2025},

date = {2025-04-01},

urldate = {2025-04-01},

journal = {J. Opt. Commun. Netw.},

volume = {17},

number = {4},

pages = {249–261},

publisher = {Optica Publishing Group},

abstract = {Traditionally, traffic from the access nodes is aggregated in metro-aggregation hubs over rings or horseshoes in a fixed configuration using multiple optical point-to-point (P2P) transceivers. However, this static setup limits dynamic scalability and often leads to inefficient resource usage and high costs, especially under increasing and varying traffic conditions. Coherent optical point-to-multipoint (P2MP) transceivers offer a promising solution for aggregation at this network level. These transceivers allow a single (aggregation) node to communicate with multiple (access) nodes simultaneously via digital subcarrier multiplexing (DSCM) technology. Additionally, their long-distance transmission capabilities enable the placement of the P2MP transceiver root deeper in the hierarchy. In this paper, we propose an extended access aggregation architecture that incorporates modified reconfigurable optical add–drop multiplexers (ROADMs) to support both traditional P2P and P2MP connections. This architecture allows the creation of light-trees to enable P2MP communication and hence to boost transmission flexibility and multiplexing gains. We propose a mixed-integer linear programming (MILP) model to determine the optimal placement of P2MP transceivers and the establishment of light-trees, considering physical layer impairments (PLIs) and the required quality of transmission (QoT) for the connections. To tackle the high algorithm complexity, we also introduce a best-fit decreasing heuristic to efficiently exploit the trade-off between execution time and performance. Our simulation experiments using real network topologies showcase that our proposed architecture can greatly enhance multiplexing gains while considering the operational costs tied to network expansions and upgrades.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2025multimodal,

title = {When Multimodal Large Language Models Meet Computer Vision: Progressive GPT Fine-Tuning and Stress Testing},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {IEEE Access},

publisher = {IEEE},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{philippopoulos2025cost,

title = {Cost-Efficient RSSI-Based Indoor Proximity Positioning, for Large/Complex Museum Exhibition Spaces},

author = {Panos I. Philippopoulos and Kostas N. Koutrakis and Efstathios D. Tsafaras and Evangelia G. Papadopoulou and Dimitrios Sigalas and Nikolaos D. Tselikas and Stefanos Ougiaroglou and Costas Vassilakis},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Sensors},

volume = {25},

number = {9},

pages = {2713},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2025llms,

title = {Llms for product classification in e-commerce: A zero-shot comparative study of gpt and claude models},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Natural Language Processing Journal},

volume = {11},

pages = {100142},

publisher = {Elsevier},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{osmenaj2025pixels,

title = {From Pixels to Diagnosis: Implementing and Evaluating a CNN Model for Tomato Leaf Disease Detection},

author = {Zamir Osmenaj and Evgenia-Maria Tseliki and Sofia H. Kapellaki and George Tselikis and Nikolaos D. Tselikas},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Information},

volume = {16},

number = {3},

pages = {231},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2025think,

title = {Think before you classify: The rise of reasoning large language models for consumer complaint detection and classification},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Electronics},

volume = {14},

number = {6},

pages = {1070},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2025optimizing,

title = {Optimizing Airline Review Sentiment Analysis: A Comparative Analysis of LLaMA and BERT Models through Fine-Tuning and Few-Shot Learning.},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Computers, Materials & Continua},

volume = {82},

number = {2},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{soumis2025web,

title = {A Web-Based Platform for Hand Rehabilitation Assessment},

author = {Dimitrios N. Soumis and Nikolaos D. Tselikas},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Big Data and Cognitive Computing},

volume = {9},

number = {3},

pages = {52},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2025fake,

title = {Fake News Detection and Classification: A Comparative Study of Convolutional Neural Networks, Large Language Models, and Natural Language Processing Models.},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Future Internet},

volume = {17},

number = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{li2025enhancing,

title = {Enhancing 3D object detection in autonomous vehicles based on synthetic virtual environment analysis},

author = {Vladislav Li and Ilias Siniosoglou and Thomai Karamitsou and Anastasios Lytos and Ioannis Moscholios and Sotirios K. Goudos and Jyoti S. Banerjee and Panagiotis Sarigiannidis and Vasileios Argyriou},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {Image and Vision Computing},

volume = {154},

pages = {105385},

publisher = {Elsevier},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{keramidi2025computational,

title = {Computational Load Offloading and Resource Management Framework in a Converged Optical-Wireless 6G Network},

author = {Irene Keramidi and John S. Vardakas and Ioannis Moscholios and Christos Verikoukis},

year  = {2025},

date = {2025-01-01},

urldate = {2025-01-01},

journal = {IEEE Transactions on Network Science and Engineering},

publisher = {IEEE},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2024llms,

title = {LLMs and NLP Models in Cryptocurrency Sentiment Analysis: A Comparative Classification Study},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

doi = {https://doi.org/10.3390/bdcc8060063},

year  = {2024},

date = {2024-06-05},

urldate = {2024-01-01},

journal = {Big Data and Cognitive Computing},

volume = {8},

number = {6},

pages = {63},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{asimopoulos2024benchmarking,

title = {Benchmarking Advanced Text Anonymisation Methods: A Comparative Study on Novel and Traditional Approaches},

author = {Dimitris Asimopoulos and Ilias Siniosoglou and Vasileios Argyriou and Thomai Karamitsou and Eleftherios Fountoukidis and Sotirios K. Goudos and Ioannis Moscholios and Konstantinos E. Psannis and Panagiotis Sarigiannidis},

doi = {https://doi.org/10.48550/arXiv.2404.14465},

year  = {2024},

date = {2024-04-22},

urldate = {2024-01-01},

journal = {arXiv preprint arXiv:2404.14465},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{philippopoulos2024holistic,

title = {A Holistic Approach for Enhancing Museum Performance and Visitor Experience},

author = {Panos I. Philippopoulos and Ioannis C. Drivas and Nikolaos D. Tselikas and Kostas N. Koutrakis and Elena Melidi and Dimitrios Kouis},

doi = {https://doi.org/10.3390/s24030966},

year  = {2024},

date = {2024-02-01},

urldate = {2024-01-01},

journal = {Sensors},

volume = {24},

number = {3},

pages = {966},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2024precision,

title = {Precision-Driven Product Recommendation Software: Unsupervised Models, Evaluated by GPT-4 LLM for Enhanced Recommender Systems},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {Software},

volume = {3},

number = {1},

pages = {62–80},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{papagiannis2024etaand,

title = {Hand dexterities assessment in stroke patients based on augmented reality and machine learning through a box and block test},

author = {Georgios Papagiannis and Athanasios Triantafyllou and Konstantina G Yiannopoulou and George Georgoudis and Maria Kyriakidou and Panagiotis Gkrilias and Apostolos Z. Skouras and Xhoi Bega and Dimitrios Stasinopoulos and George Matsopoulos and Pantelis Syringas and Nikolaos D. Tselikas and Orestis N. Zestas and Vassiliki Potsika and Athanasios Pardalis and Christoforos Papaioannou and Vasilios Protopappas and Nikolas Malizos and Nikolaos Tachos and Dimitrios I Fotiadis},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {Scientific Reports},

volume = {14},

number = {1},

pages = {10598},

publisher = {Nature Publishing Group UK London},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2024next,

title = {Next-Generation Spam Filtering: Comparative Fine-Tuning of LLMs, NLPs, and CNN Models for Email Spam Classification},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {Electronics},

volume = {13},

number = {11},

pages = {2034},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{zestas2024realizing,

title = {Realizing computer vision rehabilitation assessment tests & evaluation applications for mobile devices},

author = {Orestis N. Zestas and Nikolaos D. Tselikas},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {AEU-International Journal of Electronics and Communications},

volume = {186},

pages = {155473},

publisher = {Urban & Fischer},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{YIANNOPOULOS2024155546,

title = {Error rates of optically pre-amplified PPM wireless systems with coding and arbitrary optical filter response},

author = {Konstantinos Yiannopoulos and Nikos C. Sagias and Ioannis Moscholios},

url = {https://www.sciencedirect.com/science/article/pii/S1434841124004321},

doi = {https://doi.org/10.1016/j.aeue.2024.155546},

issn = {1434-8411},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {AEU - International Journal of Electronics and Communications},

volume = {187},

pages = {155546},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{KERAMIDI2024155530,

title = {Efficient resource management in direct and indirect transmission in V2X communications},

author = {Irene Keramidi and Dimitris Uzunidis and Ioannis Moscholios and Konstantinos Yiannopoulos and Nikos C. Sagias and Panagiotis Sarigiannidis},

url = {https://www.sciencedirect.com/science/article/pii/S1434841124004163},

doi = {https://doi.org/10.1016/j.aeue.2024.155530},

issn = {1434-8411},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {AEU - International Journal of Electronics and Communications},

volume = {187},

pages = {155530},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{YIANNOPOULOS2024102255,

title = {BEP evaluation of 5G LDPC codes in a pre-amplified optical PPM receiver},

author = {Konstantinos Yiannopoulos and Nikos C. Sagias},

url = {https://www.sciencedirect.com/science/article/pii/S1874490723002586},

doi = {https://doi.org/10.1016/j.phycom.2023.102255},

issn = {1874-4907},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {Physical Communication},

volume = {62},

pages = {102255},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ASPREAS2024154859,

title = {Reed Solomon error correction in pre-amplified pulse position modulation receivers},

author = {Antonios Aspreas and Konstantinos Yiannopoulos},

url = {https://www.sciencedirect.com/science/article/pii/S1434841123003333},

doi = {https://doi.org/10.1016/j.aeue.2023.154859},

issn = {1434-8411},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {AEU - International Journal of Electronics and Communications},

volume = {175},

pages = {154859},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{tsoumplekas2024toward,

title = {Toward green and human-like artificial intelligence: A complete survey on contemporary few-shot learning approaches},

author = {Georgios Tsoumplekas and Vladislav Li and Vasileios Argyriou and Anastasios Lytos and Eleftherios Fountoukidis and Sotirios K. Goudos and Ioannis Moscholios and Panagiotis Sarigiannidis},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {arXiv preprint arXiv:2402.03017},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{tsoumplekas2024evaluating,

title = {Evaluating the Energy Efficiency of Few-Shot Learning for Object Detection in Industrial Settings},

author = {Georgios Tsoumplekas and Vladislav Li and Ilias Siniosoglou and Vasileios Argyriou and Sotirios K. Goudos and Ioannis Moscholios and Panagiotis Radoglou-Grammatikis and Panagiotis Sarigiannidis},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {arXiv preprint arXiv:2403.06631},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{roumeliotis2024leveraging,

title = {Leveraging large language models in tourism: A comparative study of the latest GPT Omni models and BERT NLP for customer review classification and sentiment analysis},

author = {Konstantinos I. Roumeliotis and Nikolaos D. Tselikas and Dimitrios K. Nasiopoulos},

year  = {2024},

date = {2024-01-01},

urldate = {2024-01-01},

journal = {Information},

volume = {15},

number = {12},

pages = {792},

publisher = {MDPI},

keywords = {},

pubstate = {published},

tppubtype = {article}

}