Iraklis Varlamis

ORCID: 0000-0002-0876-8167
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About
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Research Areas
  • Smart Grid Energy Management
  • Topic Modeling
  • Web Data Mining and Analysis
  • Recommender Systems and Techniques
  • Complex Network Analysis Techniques
  • Data Management and Algorithms
  • Advanced Text Analysis Techniques
  • Green IT and Sustainability
  • Semantic Web and Ontologies
  • Natural Language Processing Techniques
  • Context-Aware Activity Recognition Systems
  • Sentiment Analysis and Opinion Mining
  • Maritime Navigation and Safety
  • Robotic Path Planning Algorithms
  • Autonomous Vehicle Technology and Safety
  • Human Mobility and Location-Based Analysis
  • Building Energy and Comfort Optimization
  • Anomaly Detection Techniques and Applications
  • Energy Efficiency and Management
  • Advanced Graph Neural Networks
  • IoT and Edge/Fog Computing
  • Caching and Content Delivery
  • Data Mining Algorithms and Applications
  • Text and Document Classification Technologies
  • Access Control and Trust

Harokopio University of Athens
2016-2025

Phnom Penh International University
2024

Foundation for Research and Technology Hellas
2019-2022

University of Western Macedonia
2022

National Centre of Scientific Research "Demokritos"
2022

National and Kapodistrian University of Athens
2008-2021

University of Peloponnese
2008-2021

Athens University of Economics and Business
2001-2011

University of Wollongong
2010

Hella (Germany)
2001

The explosion of social media allowed individuals to spread information without cost, with little investigation and fewer filters than before. This amplified the old problem fake news, which became a major concern nowadays due negative impact it brings communities. In order tackle rise spreading automatic detection techniques have been researched building on artificial intelligence machine learning. recent achievements deep learning in complex natural language processing tasks, make them...

10.1016/j.jjimei.2020.100007 article EN cc-by-nc-nd International Journal of Information Management Data Insights 2021-01-10

Recommender systems have significantly developed in recent years parallel with the witnessed advancements both internet of things (IoT) and artificial intelligence (AI) technologies. Accordingly, as a consequence IoT AI, multiple forms data are incorporated these systems, e.g. social, implicit, local personal information, which can help improving recommender systems' performance widen their applicability to traverse different disciplines. On other side, energy efficiency building sector is...

10.1016/j.inffus.2021.02.002 article EN cc-by Information Fusion 2021-02-15

After different consecutive waves, the pandemic phase of Coronavirus disease 2019 does not look to be ending soon for most countries across world. To slow spread COVID-19 virus, several measures have been adopted since start outbreak, including wearing face masks and maintaining social distancing. Ensuring safety in public areas smart cities requires modern technologies, such as deep learning transfer learning, computer vision automatic mask detection accurate control whether people wear...

10.3390/systems11020107 article EN cc-by Systems 2023-02-17

The computation of relatedness between two fragments text in an automated manner requires taking into account a wide range factors pertaining to the meaning convey, and pairwise relations their words. Without doubt, measure segments must take both lexical semantic Such that captures well aspects may help many tasks, such as retrieval, classification clustering. In this paper we present new approach for measuring words based on implicit links. exploits only word thesaurus order devise links...

10.1613/jair.2880 article EN cc-by Journal of Artificial Intelligence Research 2010-01-25

Social network analysis has recently gained a lot of interest because the advent and increasing popularity social media, such as blogs, networking applications, microblogging, or customer review sites. In this environment, trust is becoming an essential quality among user interactions recommendation for useful content trustful users crucial all members network. paper, we introduce framework handling in networks, which based on reputation mechanism that captures implicit explicit connections...

10.1109/tsmc.2013.2263128 article EN IEEE Transactions on Systems Man and Cybernetics Systems 2013-06-28

Recommender systems have been widely used in different application domains including energy-preservation, e-commerce, healthcare, social media, etc. Such applications require the analysis and mining of massive amounts various types user data, demographics, preferences, interactions, order to develop accurate precise recommender systems. datasets often include sensitive information, yet most are focusing on models' accuracy ignore issues related security users' privacy. Despite efforts...

10.1016/j.cosrev.2021.100439 article EN cc-by Computer Science Review 2021-11-22

The recent advances in artificial intelligence namely machine learning and deep learning, have boosted the performance of intelligent systems several ways. This gave rise to human expectations, but also created need for a deeper understanding how think decide. concept explainability appeared, extent explaining internal system mechanics terms. Recommendation are that support decision making, as such, they be explainable order increase user trust improve acceptance recommendations. In this...

10.1002/int.22314 article EN International Journal of Intelligent Systems 2020-10-21

Recommender systems are a key technology for many applications, such as e-commerce, streaming media, and social media. Traditional recommender rely on collaborative filtering or content-based to make recommendations. However, these approaches have limitations, the cold start data sparsity problem. This survey paper presents an in-depth analysis of paradigm shift from conventional generative pre-trained-transformers-(GPT)-based chatbots. We highlight recent developments that leverage power...

10.3390/bdcc8040036 article EN cc-by Big Data and Cognitive Computing 2024-03-27

Web personalization is the process of customizing a site to needs each specific user or set users, taking advantage knowledge acquired through analysis user's navigational behavior. Integrating usage data with content, structure profile enhances results process. In this paper, we present SEWeP, system that makes use both logs and semantics site's content in order personalize it. semantically annotated using conceptual hierarchy (taxonomy). We introduce C-logs, an extended form encapsulates...

10.1145/956750.956765 article EN 2003-08-24

Among the large number of efforts that study role technology in energy saving, there exists, first, frameworks for monitoring and controlling consumption households, second, systems suggest best practices to users providers, third, findings focus on motivations trigger a behavioral change toward efficiency. However, is still no work builds habitual behavior individuals use this purpose. In paper, we survey literature aims at understanding consumers then changing it by recommending...

10.1109/jsyst.2019.2899832 article EN IEEE Systems Journal 2019-03-25

Excessive domestic energy usage is an impediment towards efficiency. Developing countries are expected to witness unprecedented rise in electricity the forthcoming decades. A large amount of research has been directed behavioral change for Thus, it prudent develop intelligent system that combines proper use technology with behavior order sustainably transform end-user at a scale. This paper presents overview our AI-based efficiency framework applications and explains how micro-moments can...

10.1109/access.2020.2966640 article EN cc-by IEEE Access 2020-01-01

Trajectory data holds pivotal importance in the shipping industry and transcend their significance various domains, including transportation, health care, tourism, surveillance, security. In maritime domain, improved predictions for estimated time of arrival (ETA) optimal recommendations alternate routes when weather conditions deem it necessary can lead to lower costs, reduced emissions, an increase overall efficiency industry. To this end, a methodology that yields route vessels is...

10.3390/jmse12010157 article EN cc-by Journal of Marine Science and Engineering 2024-01-12

Unmanned Aerial Systems (UAS) have rapidly gained attraction in recent years as a promising solution to revolutionize numerous applications and meet the growing demand for efficient timely delivery services due their highly automated operation framework. Beyond Visual Line of Sight (BVLOS) operations, particular, offer new means delivering added-value via wide range applications. This "plateau productivity" holds enormous promise, but it is challenging equip drone with affordable...

10.3390/electronics13020340 article EN Electronics 2024-01-12

Robots are intelligent machines that capable of autonomously performing intricate sequences actions, with their functionality being primarily driven by computer programs and machine learning models. Educational robots specifically designed used for teaching purposes attain the interest learners in gaining knowledge about science, technology, engineering, arts, mathematics. widely applied different fields primary secondary education, but usage higher education subjects is limited. Even when...

10.3390/computers13040102 article EN cc-by Computers 2024-04-17

A large part of the hidden web resides in weblog servers; traditional search engines perform poorly on blogs. We present a method for ranking weblogs utilizing both link graph and similarity, based an enhanced weighted capturing crucial features. Rankings are then assigned using our algorithm, BlogRank, which is modified version PageRank.To validate we ran experiments dataset, processed adapted to engine: http://spiderwave.aueb.gr/BlogwaveOur suggest that algorithm enhances quality returned results.

10.1145/1190183.1190193 article EN 2006-01-01

An international association advancing the multidisciplinary study of informing systems. Founded in 1998, Informing Science Institute (ISI) is a global community academics shaping future science.

10.28945/401 article EN Interdisciplinary Journal of e-Skills and Lifelong Learning 2006-01-01
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