@conference {545,
	title = {Data Science Tutor: An online platform for automated exercise solving in Data Science},
	booktitle = {Proceedings of the 9th Conference on Computer Science Teaching (DIDINFO)},
	year = {2018},
	month = {October},
	address = {Thessaloniki, Greece},
	author = {Christos Tryfonopoulos and Charis Kotsiopoulos and Paraskevi Raftopoulou}
}
@article {582,
	title = {Distributed Large-Scale Information Filtering},
	journal = {Transactions on Large-Scale Data- and Knowledge-Centered Systems (TLDKS)},
	volume = {13},
	year = {2014},
	pages = {91{\textendash}122},
	abstract = {We study the problem of distributed resource sharing in peer-to-peer networks and focus on the problem of information filter- ing. In our setting, subscriptions and publications are specified using an expressive attribute-value representation that supports both the Boolean and Vector Space models. We use an extension of the distributed hash table Chord to organise the nodes and store user subscriptions, and utilise efficient publication protocols that keep the network traffic and latency low at filtering time. To verify our approach, we evaluate the proposed protocols experimentally using thousands of nodes, millions of user subscriptions, and two different real-life corpora. We also study three important facets of the load-balancing problem in such a scenario and present a novel algorithm that manages to distribute the load evenly among the nodes. Our results show that the designed protocols are scalable and efficient: they achieve expressive information filtering functionality with low message traffic and latency.},
	keywords = {distributed hash tables, Information management, publish/subscribe},
	author = {Christos Tryfonopoulos and Stratos Idreos and Manolis Koubarakis and Paraskevi Raftopoulou}
}
@conference {550,
	title = {DS4: A Distributed Social and Semantic Search System},
	booktitle = {Proceedings of 35th European Conference on Information Retrieval (ECIR)},
	year = {2013},
	month = {March},
	address = {Moscow, Russia},
	author = {Dionisis Kontominas and Paraskevi Raftopoulou and Christos Tryfonopoulos and E.G.M. Petrakis}
}
@conference {539,
	title = {DS4: Introducing Semantic Friendship in Distributed Social Networks.},
	booktitle = {Proceedings of the 21st International Conference on Cooperative Information Systems (CoopIS)},
	year = {2013},
	month = {September},
	address = {Graz, Austria},
	author = {Paraskevi Raftopoulou and Christos Tryfonopoulos and E.G.M. Petrakis and Nikos Zevlis}
}
@conference {597,
	title = {Design and Evaluation of Semantic Similarity Measures for Concepts Stemming from the Same or Different Ontologies},
	booktitle = {Proceedings of the 4th Workshop on Multimedia Semantics (WMS)},
	year = {2006},
	month = {June},
	address = {Chania, Crete, Greece},
	abstract = {Semantic Similarity relates to computing the similarity between concepts (terms) which are not necessarily lexically similar. We investigate approaches to computing semantic similarity by mapping terms to an ontology and by examining their relationships in that ontology. More specifically, we investigate approaches to computing the semantic similarity between natural language terms (using WordNet as the underlying reference ontology) and between medical terms (using the MeSH ontology of medical and biomedical terms). The most popular semantic similarity methods are implemented and evaluated using WordNet and MeSH. The focus of this work is also on cross ontology methods which are capable of computing the semantic similarity between terms stemming from different ontologies (WordNet and MeSH in this work). This is a far more difficult problem (than the single ontology one referred to above) which has not been investigated adequately in the literature. X-Similarity, a novel cross-ontology similarity method is also a contribution of this work. All methods examined in this work are integrated into a semantic similarity system which is accessible on the Web.},
	author = {E.G.M. Petrakis and Giannis Varelas and Angelos Hliaoutakis and Paraskevi Raftopoulou}
}
@conference {536,
	title = {Data Models and Languages for Agent-Based Textual Information Dissemination},
	booktitle = {Proceedings of the 6th International Workshop on Cooperative Information Agents (CIA)},
	year = {2002},
	month = {September},
	publisher = {Springer},
	organization = {Springer},
	address = {Madrid, Spain},
	author = {Manolis Koubarakis and Christos Tryfonopoulos and Paraskevi Raftopoulou and Theodoros Koutris}
}
