George A Tsihrintzis

Prof. Dr. George A Tsihrintzis

Department of Informatics, University of Piraeus, 18534 Piraeus, Greece
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Research Focus & Metrics

Academic Career Length

20Years (2007-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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27 October 2023 in Electronics
Verified
Journal Article
Open access
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DPDimitrios P. Panagoulias
Dimitrios P. Panagoulias
Elissaios SarmasElissaios Sarmas
Elissaios Sarmas
Vangelis MarinakisVangelis Marinakis
Vangelis Marinakis
MVMaria Virvou
Maria Virvou
George A TsihrintzisGeorge A Tsihrintzis
George A Tsihrintzis
HDHaris Doukas
Haris Doukas
This paper presents a novel development methodology for artificial intelligence (AI) analytics in energy management that focuses on tailored explainability to overcome the “black box” issue associated with AI analytics. Our approach addresses the fact that any given analytic service is to be used by different stakeholders, with different backgrounds, preferences, abilities, skills, and goals. Our methodology is aligned with the explainable artificial intelligence (XAI) paradigm and aims to enhance the interpretability of AI-empowered decision support systems (DSSs). Specifically, a clustering-based approach is adopted to customize the depth of explainability based on the specific needs of different user groups. This approach improves the accuracy and effectiveness of energy management analytics while promoting transparency and trust in the decision-making process. The methodology is structured around an iterative development lifecycle for an intelligent decision support system and includes several steps, such as stakeholder identification, an empirical study on usability and explainability, user clustering analysis, and the implementation of an XAI framework. The XAI framework comprises XAI clusters and local and global XAI, which facilitate higher adoption rates of the AI system and ensure responsible and safe deployment. The methodology is tested on a stacked neural network for an analytics service, which estimates energy savings from renovations, and aims to increase adoption rates and benefit the circular economy.


17 November 2022 in Education and Information Technologies
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Journal Article
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Chrysafiadi KonstantinaChrysafiadi Konstantina
Chrysafiadi Konstantina
MVMaria Virvou
Maria Virvou
George A TsihrintzisGeorge A Tsihrintzis
George A Tsihrintzis
Ioannis HatzilygeroudisIoannis Hatzilygeroudis
Ioannis Hatzilygeroudis
Nowadays, the improvement of digital learning with Artificial Intelligence has attracted a lot of research, as it provides solutions for individualized education styles which are independent of place and time. This is particularly the case for computer science, as a tutoring domain, which is rapidly growing and changing and as such, learners need frequent update courses. In this paper, we present a thorough evaluation of a fuzzy-based intelligent tutoring system (ITS), that teaches computer programming. The evaluation concerns multiple aspects of the ITS. The evaluation criteria are: (i) context, (ii) effectiveness, (iii) efficiency, (iv) accuracy, (v) usability and satisfaction, and (vi) engagement and motivation. In the evaluation process students of an undergraduate program in Informatics of the University of Piraeus in Greece participated. The evaluation method that was used included questionnaires, analysis of log files and experiments. Also, t-tests were conducted to certify the validity of the evaluation results. Indeed, the evaluation results are very positive and show that the incorporated fuzzy mechanism to the presented ITS enhances the system with Artificial Intelligence and through this, it increases the learners’ satisfaction and new knowledge learning and mastering, improves the recommendation accuracy of the system, the efficacy of interactions, and contributes positively to the learners’ engagement in the learning process.

2 March 2020 in Annals of Operations Research
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Journal Article
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KLKonstantinos Liagkouras
Konstantinos Liagkouras
KMK. Metaxiotis
K. Metaxiotis
George A TsihrintzisGeorge A Tsihrintzis
George A Tsihrintzis

21 May 2024 in Information Sciences
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Journal Article
Open access
MVMaria Virvou
Maria Virvou
George A TsihrintzisGeorge A Tsihrintzis
George A Tsihrintzis
ETEvangelia-Aikaterini Tsichrintzi
Evangelia-Aikaterini Tsichrintzi

11 January 2024 in Electronics
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Journal Article
Open access
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DPDimitrios P. Panagoulias
Dimitrios P. Panagoulias
MVMaria Virvou
Maria Virvou
George A TsihrintzisGeorge A Tsihrintzis
George A Tsihrintzis
In this paper, we present a novel Artificial Intelligence (AI) -empowered system that enhances large language models and other machine learning tools with rules to provide primary care diagnostic advice to patients. Specifically, we introduce a novel methodology, represented through a process diagram, which allows the definition of generative AI processes and functions with a focus on the rule-augmented approach. Our methodology separates various components of the generative AI process as blocks that can be used to generate an implementation data flow diagram. Building upon this framework, we utilize the concept of a dialogue process as a theoretical foundation. This is specifically applied to the interactions between a user and an AI-empowered software program, which is called “Med|Primary AI assistant” (Alpha Version at the time of writing), and provides symptom analysis and medical advice in the form of suggested diagnostics. By leveraging current advancements in natural language processing, a novel approach is proposed to define a blueprint of domain-specific knowledge and a context for instantiated advice generation. Our approach not only encompasses the interaction domain, but it also delves into specific content that is relevant to the user, offering a tailored and effective AI–user interaction experience within a medical context. Lastly, using an evaluation process based on rules, defined by context and dialogue theory, we outline an algorithmic approach to measure content and responses.