Dr. Konstantinos I. Roumeliotis

Adjunct Assistant Professor at University of Peloponnese

Specializing in Applied Artificial Intelligence, Agentic AI, Multimodal Large Language Models, Natural Language Processing, Business Intelligence and Software Engineering

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Konstantinos I. Roumeliotis Photo

Teaching Experience

Adjunct Assistant Professor
University of Peloponnese | Department Of Digital Systems | 2024 - Present

Teaching Courses:

  1. Artificial Intelligence
  2. Knowledge Extraction and Machine Learning
  3. Object-Oriented Programming
  4. Web Application Development

Education

Research Interests

Agentic AI and AI Agents

Building real-life AI agents that can perform tasks autonomously. Focus on orchestration, reasoning, and real-world integration using agentic architectures.

Large Language Models

Fine-tuning and deployment of state-of-the-art language models including GPT, Qwen, DeepSeek, Claude and more. Focus on practical applications in research and business contexts.

Multimodal-LLMs

Leveraging multimodal large language models for complex business use cases by integrating vision, text, and more to solve real-world challenges.

Publications

Under Review [UR2]
Orchestrator-Agent Trust: A Modular Agentic AI Visual Classification System with Trust-Aware Orchestration and RAG-Based Reasoning

arXiv, 2025 | Under Review
K.I. Roumeliotis, R. Sapkota, M. Karkee, N.D. Tselikas

Under Review [UR1] 4 citations
Plant Disease Detection through Multimodal Large Language Models and Convolutional Neural Networks

arXiv, 2025 | Under Review
K.I. Roumeliotis, R. Sapkota, M. Karkee, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J19] 55 citations
AI Agents vs. Agentic AI: A Conceptual Taxonomy, Applications and Challenges

Information Fusion, Elsevier Journal, 2025, 126(B), 103599 (SJR:Q1 IF:15.5 CS:24.1)
R. Sapkota, K.I. Roumeliotis, M. Karkee

Journal Article [J18]
When Multimodal Large Language Models Meet Computer Vision: Progressive GPT Fine-Tuning and Stress Testing

IEEE Access, 2025, 13, 106155-106174 (SJR:Q1 IF:3.6 CS:9)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J17] 2 citations
Financial Sentiment Analysis and Classification: A Comparative Study of Fine-Tuned Deep Learning Models

International Journal of Financial Studies, MDPI Journal, 2025, 13(2), 75 (SJR:Q2 IF:2.2 CS:4.6)
D.K. Nasiopoulos, K.I. Roumeliotis, D.P. Sakas, K. Toudas, P Reklitis

Journal Article [J16] 5 citations
LLMs for product classification in e-commerce: A zero-shot comparative study of GPT and Claude models

Natural Language Processing, Elsevier Journal, 2025, 11, 100142
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J15] 18 citations
Think Before You Classify: The Rise of Reasoning Large Language Models for Consumer Complaint Detection and Classification

Electronics, MDPI Journal, 2025, 14(6), 1070 (SJR:Q2 IF:2.6 CS:6.1)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J14] 20 citations
Fake News Detection and Classification: A Comparative Study of Convolutional Neural Networks, Large Language Models, and Natural Language Processing Models

Future Internet, MDPI Journal, 2025, 17(1), 28 (SJR:Q2 IF:3.6 CS:8.3)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J13] 1 citations
Optimizing Airline Review Sentiment Analysis: A Comparative Analysis of LLaMA and BERT Models through Fine-Tuning and Few-Shot Learning

Computers, Materials & Continua, Tech Science Press, 2025, 82(2), 2769-2792 (SJR:Q2 IF:1.7 CS:6.1)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J12] 19 citations
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

Information, MDPI Journal, 2024, 15(12), 792 (SJR:Q2 IF:2.9 CS:6.5)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J11] 27 citations
Next-Generation Spam Filtering: Comparative Fine-Tuning of LLMs, NLPs, and CNN Models for Email Spam Classification

Electronics, MDPI Journal, 2024, 13(11), 2034 (SJR:Q2 IF:2.6 CS:6.1)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J10] 32 citations
LLMs and NLP Models in Cryptocurrency Sentiment Analysis: A Comparative Classification Study

Big Data and Cognitive Computing, MDPI Journal, 2024, 8(6), 63 (SJR:Q1 IF:4.4 CS:9.8)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J9] 15 citations
Precision-Driven Product Recommendation Software: Unsupervised Models, Evaluated by GPT-4 LLM for Enhanced Recommender Systems

Software, MDPI Journal, 2024, 3(1), 62-80
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J8] 101 citations
LLMs in e-commerce: A comparative analysis of GPT and LLaMA models in product review evaluation

Natural Language Processing, Elsevier Journal, 2024, 6, 100056
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J7] 21 citations
Unveiling Sustainability in Ecommerce: GPT-Powered Software for Identifying Sustainable Product Features

Sustainability, MDPI Journal, 2023, 15(15), 12015 (SJR:Q1 IF:3.3 CS:7.7)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J6] 6 citations
A Machine Learning Python-Based Search Engine Optimization Audit Software

Informatics, MDPI Journal, 2023, 10(3), 68 (SJR:Q1 IF:2.8 CS:8.4)
K.I. Roumeliotis, N.D. Tselikas

Journal Article [J5] 845 citations
ChatGPT and Open-AI Models: A Preliminary Review

Future Internet, MDPI Journal, 2023, 15(6), 192 (SJR:Q2 IF:3.6 CS:8.3)
K.I. Roumeliotis, N.D. Tselikas

Journal Article [J4] 22 citations
Evaluating Progressive Web App Accessibility for People with Disabilities

Network, MDPI Journal, 2022, 2(2), 350-369 (JCR:Q2 IF:3.1 CS:6.5)
K.I. Roumeliotis, N.D. Tselikas

Journal Article [J3] 20 citations
Airlines Sustainability Study Based on Search Engine Optimization Techniques and Technologies

Sustainability, MDPI Journal, 2022, 14(18), 11225 (SJR:Q1 IF:3.3 CS:7.7)
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

Journal Article [J2] 34 citations
An Effective SEO Techniques and Technologies Guide-Map

Journal of Web Engineering, 2022, 21(5), 1603-1649 (SJR:Q3 IF:1.0)
K.I. Roumeliotis, N.D. Tselikas

Journal Article [J1] 7 citations
Greek Hotels Web Traffic: A Comparative Study Based on Search Engine Optimization Techniques and Technologies

Digital, MDPI Journal, 2022, 2(3), 379-400 (CS:4.8)
K.I. Roumeliotis, N.D. Tselikas, C. Tryfonopoulos

Book Chapter [B7]
Churn Modeling in E-commerce: Leveraging the Power of Logistic Regression and Neural Networks

Computational and Strategic Business Modelling, Springer, 2025 (Acceptance Letter)
K.I. Roumeliotis, N.D. Tselikas

Book Chapter [B6]
Deep Learning for Supply Chain Predictive Analytics and Logistics Optimization: A Feedforward Neural Network Approach

Computational and Strategic Business Modelling, Springer, 2025 (Acceptance Letter)
K.I. Roumeliotis, D.K. Nasiopoulos

Book Chapter [B5]
Customer Segmentation in E-Commerce Using RFM Analysis and K-Means Clustering: A Software-Driven Approach for Data-Driven Marketing Strategies

Computational and Strategic Business Modelling, Springer, 2025 (Acceptance Letter)
K.I. Roumeliotis, D.K. Nasiopoulos

Book Chapter [B4]
Do Shipping Delays Dominate in Shaping User Satisfaction? A Deep Learning and Feature Engineering Perspective

Computational and Strategic Business Modelling, Springer, 2025 (Acceptance Letter)
K.I. Roumeliotis, D.K. Nasiopoulos

Book Chapter [B3]
GPT and BERT for Text Classification with Fine-Tuning and Few-shot Learning for Enhanced Prediction Models and Decision Support Systems

Computational and Strategic Business Modelling, Springer, 2025 (Acceptance Letter)
K.I. Roumeliotis, D.K. Nasiopoulos

Book Chapter [B2] 4 citations
Search Engine Optimization Techniques: The Story of an Old-Fashioned Website

Business Intelligence and Modelling, Springer, 2021 (Scopus Indexed)
K.I. Roumeliotis, N.D. Tselikas

Book Chapter [B1] 2 citations
Accelerated Mobile Pages: A Comparative Study

Business Intelligence and Modelling, Springer, 2021 (Scopus Indexed)
K.I. Roumeliotis, N.D. Tselikas

PrePrint [P6] 18 citations
Vision-Language-Action Models: Concepts, Progress, Applications and Challenges

arXiv, 2025
R. Sapkota, Y. Cao, K.I. Roumeliotis, M. Karkee

PrePrint [P5] 12 citations
Vibe Coding vs. Agentic Coding: Fundamentals and Practical Implications of Agentic AI

arXiv, 2025
R. Sapkota, K.I. Roumeliotis, M. Karkee

PrePrint [P4] 3 citations
A Review of 3D Object Detection with Vision-Language Models

arXiv, 2025
R. Sapkota, K.I. Roumeliotis, R.H. Cheppally, M.F. Calero, M. Karkee

PrePrint [P3] 1 citations
From Self-Learning to Self-Evolving Architectures in Large Language Models: A Short Survey

arXiv, 2025
R. Sapkota, K.I. Roumeliotis, S. Pokhrel, M. Karkee

PrePrint [P2] 3 citations
UAVs Meet Agentic AI: A Multidomain Survey of Autonomous Aerial Intelligence and Agentic UAVs

arXiv, 2025
R. Sapkota, K.I. Roumeliotis, M. Karkee

PrePrint [P1] 50 citations
Llama 2: Early Adopters' Utilization of Meta's New Open-Source Pretrained Model

Preprints, 2025
K.I. Roumeliotis, N.D. Tselikas, D.K. Nasiopoulos

34

Total Publications

19

Journal Articles

7

Book Chapters

2

Under Review

6

PrePrints

1,347

Total Citations

Contact

  • k.roumeliotis (at) uop (dot) gr
  • Tripoli, Greece
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