Prof. Dr. Stefanos Ougiaroglou
Department of Digital Systems, University of the Peloponnese, 23100 Kladas, Sparta, Greece
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Academic Career Length
20Years (2007-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications8 August 2014 in Pattern Analysis and Applications
Journal Article
Stefanos Ougiaroglou
Georgios Evangelidis1 March 2018 in Neurocomputing
Journal Article
Stefanos OugiaroglouKDKonstantinos I. Diamantaras
Konstantinos I. Diamantaras
GEGeorgios Evangelidis
Georgios Evangelidis
Journal Article
Charalampos BratsasEAEfstathios Konstantinos Anastasiadis
Efstathios Konstantinos Anastasiadis
Alexandros K. AngelidisLILazaros Ioannidis
Lazaros Ioannidis
Rigas KotsakisStefanos OugiaroglouThe amount of data related to cyber threats and cyber attack incidents is rapidly increasing. The extracted information can provide security analysts with useful Cyber Threat Intelligence (CTI) to enhance their decision-making. However, because the data sources are heterogeneous, there is a lack of common representation of information, rendering the analysis of CTI complicated. With this work, we aim to review ongoing research on the use of semantic web tools such as ontologies and Knowledge Graphs (KGs) within the CTI domain. Ontologies and KGs can effectively represent information in a common and structured schema, enhancing interoperability among the Security Operation Centers (SOCs) and the stakeholders on the field of cybersecurity. When fused with Machine Learning (ML) and Deep Learning (DL) algorithms, the constructed ontologies and KGs can be augmented with new information and advanced inference capabilities, facilitating the discovery of previously unknown CTI. This systematic review highlights the advancements of this field over the past and ongoing decade and provides future research directions.
5 September 2007 in Lecture Notes in Computer Science
Book Chapter
Stefanos OugiaroglouANAlexandros Nanopoulos
Alexandros Nanopoulos
APApostolos N. Papadopoulos
Apostolos N. Papadopoulos
YMYannis Manolopoulos
Yannis Manolopoulos
TWTatjana Welzer-Druzovec
Tatjana Welzer-Druzovec
16 September 2012
Conference Paper
Stefanos OugiaroglouGeorgios EvangelidisJournal Article
Aristotelis Kampatzis
Antonis Sidiropoulos
Konstantinos DiamantarasStefanos OugiaroglouSentiment Analysis in text, especially text containing scientific citations, is an emerging research field with important applications in the research community. This review explores the field of sentiment analysis by focusing on the interpretation of citations, presenting a detailed description of techniques and methods ranging from lexicon-based approaches to Machine and Deep Learning models. The importance of understanding both the emotion and the intention behind citations is emphasized, reflecting their critical role in scientific communication. In addition, this study presents the challenges faced by researchers (such as complex scientific terminology, multilingualism, and the abstract nature of scientific discourse), highlighting the need for specialized language processing techniques. Finally, future research directions include improving the quality of datasets as well as exploring architectures and models to improve the accuracy of sentiment detection.
About Me
Stefanos Ougiaroglou is an Assistant Professor at the dept. of Information and Electronic Engineering of International Hellenic University where he teaches Programming, Databases, Web Development, and Data Mining. In the past, he was an Assistant Professor at the University of the Peloponnese, Greece, and a Laboratory Lecturer at the International Hellenic University. Also, he has been employed as an adjunct lecturer at the Department of Telecommunication Systems and Networking of TEI of Messolonghi, Greece. His research interests include Data Mining algorithms and Knowledge Discovery, Machine learning, Databases, Algorithms and Data Structures, Educational Technology and Web development. He received a B.Sc. in Computer Science from Alexander TEI of Thessaloniki, Greece, a M.Sc. in Computer Science (2006) from the Department of Computer Science of Aristotle University of Thessaloniki, Greece, and a Ph.D. in Computer Science (2014) from the department of Applied Informatics of University of Macedonia, Greece. His PhD studies were supported by a Scholarship from State Scholarships Foundation of Greece. From 2016 to 2019, he conducted postdoctoral research at the Department of Applied Informatics of the University of Macedonia, Greece. Therefore, he holds a Post Doctoral Certificate from this department. Moreover, Stefanos Ougiaroglou holds a Certificate of Pedagogical and Teaching Competence (2010), from ASPAITE, Greece.