› Theses

  • N. Pelekis "STAU: A spatio-temporal extension for the ORACLE DBMS", PhD Thesis, UMIST, 2002.
  • N. Pelekis "Fuzzy Miner: A Fuzzy System for Solving Pattern Classification Problems", M.Sc. Thesis, UMIST, 1999.

    • › Monographs

  • N. Pelekis, Y. Theodoridis "Mobility Data Management and Exploration", Springer, New York, 2014, in press. ISBN 978-1-4939-0391-7.

    • › Articles in refereed journals

  • C. Parent, S. Spaccapietra, C. Renso, G. Andrienko, N. Andrienko, V. Bogorny, M. L. Damiani, A. Gkoulalas-Divanis, J. Macedo, N. Pelekis, Y. Theodoridis, Z. Yan "Semantic Trajectories Modeling and Analysis", ACM Computing Surveys, 45(4), December 2013. ACM Press.
  • N. Pelekis, Y. Theodoridis, D. Janssens "On the management and analysis of our LifeSteps", SIGKDD Explorations, 15(1):23-32, June 2013. ACM.
  • G. Kellaris, N. Pelekis, Y. Theodoridis "Map-Matched Trajectory Compression", Journal of Systems and Software, 86(6):1566-1579, June 2013. Elsevier.
  • N. Pelekis, E. Frentzos, N. Giatrakos, and Y. Theodoridis "HERMES: A Trajectory DB Engine for Mobility-Centric Applications", International Journal of Knowledge-based Organizations (IJKBO), 4(1), 2014. IGI Global.
  • N. Pelekis, E. Frentzos, N. Giatrakos, and Y. Theodoridis "On the Support of Mobility in ORDBMS", International Journal of Knowledge-based Organizations (IJKBO), 4(1), 2014. IGI Global.
  • C. Panagiotakis, N. Pelekis, I. Kopanakis, E. Ramasso, Y. Theodoridis "Segmentation and Sampling of Moving Object Trajectories based on Representativeness", IEEE Transactions on Knowledge and Data Engineering, 24(7):1328-1343, July 2012. IEEE CS Press.
  • N. Pelekis, G. Andrienko, N. Andrienko, I. Kopanakis, G. Marketos, Y. Theodoridis "Visually Exploring Movement Data via Similarity-based Analysis", Journal of Intelligent Information Systems (JIIS), 38(2), 2012. Springer.
  • N. Pelekis, I. Kopanakis, E. Kotsifakos, E. Frentzos and Y. Theodoridis "Clustering Uncertain Trajectories", Knowledge and Information Systems (KAIS), 28(1):117-147, 2011. Springer.
  • A. Raffaetà, L. Leonardi, G. Marketos, G. Andrienko, N. Andrienko, E. Frentzos, N. Giatrakos, S. Orlando, N. Pelekis, A. Roncato, C. Silvestri "Visual Mobility Analysis using T-Warehouse", International Journal of Data Warehousing & Mining, 7(1), 2011.
  • H. Karanikas, G. Koundourakis, I. Kopanakis, T. Mavroudakis, N. Pelekis "Discovering market trends in the biotechnology industry", International Journal of Business Intelligence and Data Mining (IJBIDM), Vol. 6, No. 2, 2011.
  • D. K. Iakovidis, N. Pelekis, H. Karanikas, E. Kotsifakos, I. Kopanakis and Y. Theodoridis "A Pattern Similarity Scheme for Medical Image Retrieval", IEEE Transactions on Information Technology in Biomedicine Journal, 13(4):442-450, July 2009. IEEE CS Press.
  • N. Pelekis, D. K. Iakovidis, E. Kotsifakos and I. Kopanakis "Fuzzy Clustering of Intuitionistic Fuzzy Data", International Journal of Business Intelligence and Data Mining, 3(1), 45-65, 2008.
  • E. Frentzos, K. Gratsias, N. Pelekis and Y. Theodoridis "Algorithms for Nearest Neighbor Search on Moving Object Trajectories", Geoinformatica, 11:159–193, 2007. Springer.
  • I. Kopanakis, S. Karagiannis, N. Pelekis, H. Karanikas "3D Class-Preserving Projection Technique for the representation of N-Dimensional Classified Data and Association Rules", Journal of Universal Computer Science, 2005.
  • N. Pelekis, B. Theodoulidis, I. Kopanakis and Y. Theodoridis "Fuzzy Miner: Extracting Fuzzy Rules from Numerical Patterns", International Journal of Data Warehousing & Mining, 1(1), 57-81, Jan-March 2005.
    Also appears as Chapter 4.30 in Data warehousing and mining : concepts, methodologies, tools and applications. J. Wang (ed), IGI Global, 2008.
  • N. Pelekis, B. Theodoulidis, I. Kopanakis and Y. Theodoridis "Literature Review of Spatio-Temporal Database Models", The Knowledge Engineering Review journal, 19(3), 235-274, 2004.

    • › Chapters in books

  • G. Marketos, M. L. Damiani, N. Pelekis, Y. Theodoridis, Z. Yan "Trajectory Collection and Reconstruction", In C. Renso, S. Spaccapietra, and E. Zimányi (ed.), Mobility Data: Modeling, Management, and Understanding. Cambridge University Press, 2013, to appear.
  • N. Andrienko, G. Andrienko, N. Pelekis, and S. Spaccapietra "Basic concepts of movement data", In F. Giannotti and D. Pedreschi (eds), Mobility, Data Mining and Privacy, Geographic Knowledge Discovery. Springer, 2008.
  • C. Renso, S. Puntoni, E. Frentzos, A. Mazzoni, B. Moelans, N. Pelekis and F. Pini "Wireless Network Data Sources: Tracking and Synthesizing Trajectories", In F. Giannotti and D. Pedreschi (eds), Mobility, Data Mining and Privacy, Geographic Knowledge Discovery. Springer, 2008.
  • J. Macedo, C. Vangenot, W. Othman, N. Pelekis, E. Frentzos, B. Kuijpers, I. Ntoutsi, S. Spaccapietra and Y. Theodoridis "Trajectory data models", In F. Giannotti and D. Pedreschi (eds), Mobility, Data Mining and Privacy, Geographic Knowledge Discovery. Springer, 2008.
  • E. Frentzos, N. Pelekis, I Ntoutsi and Y. Theodoridis "Trajectory Database Systems", In F. Giannotti and D. Pedreschi (eds), Mobility, Data Mining and Privacy, Geographic Knowledge Discovery. Springer, 2008.
  • N. Pelekis, A. Raffaeta, M.L. Damiani, C. Vangenot, G. Marketos, E. Frentzos, I Ntoutsi and Y. Theodoridis "Towards Trajectory Data Warehouses", In F. Giannotti and D. Pedreschi (eds), Mobility, Data Mining and Privacy, Geographic Knowledge Discovery. Springer, 2008.
  • I. Ntoutsi, N. Pelekis and Y. Theodoridis, "Pattern Comparison in Data Mining: a survey", Research and Trends in Data Mining Technologies and Applications: Advances in Data Warehousing and Mining, Idea Group Publishing, 2007.

    • › Papers in fully refereed Int’l conferences, symposia and workshops

  • R. Fileto, M. Krüger, N. Pelekis, Y. Theodoridis, C. Renso "Baquara: A Holistic Ontological Framework for Movement Analysis with Linked Data", Proceedings of the 32nd International Conference on Conceptual Modeling, ER’13, Hong Kong, November 2013. Springer. Best paper award.
  • B. Krogh, O. Andersen, E. Lewis-Kelham, N. Pelekis, Y. Theodoridis, C. Torp "Trajectory Based Traffic Analysis", demo paper, Proceedings of the 21st Int’l Conference on Advances in Geographic Information Systems, ACM SIGSPATIAL GIS’13, Orlado, Florida, USA, November 2013. ACM Press.
  • N. Pelekis, C. Ntrigkogias, P. Tampakis, S. Sideridis, Y. Theodoridis "Hermoupolis: A Trajectory Generator for Simulating Generalized Mobility Patterns", demo paper, Proceedings of the European Conference on Machine Learning / Principles and Practice of Knowledge Discovery in Databases, ECML/PKDD'13, Prague, Czech Republic, September 2013. Springer.
  • E. Frentzos, N. Pelekis, Nikos Giatrakos, Yannis Theodoridis "Cost Models for Nearest Neighbor Query Processing over Existentially Uncertain Spatial Data", Proceedings of the 13th Int’l Symposium on Spatial and Temporal Databases, SSTD’13, Munich, Germany, August 2013. Springer.
  • A. Doulamis, N. Pelekis, Y. Theodoridis "EasyTracker: An Android Application for Capturing Mobility Behavior", Proceedings of the 16th Panhellenic Conference on Informatics, special session on “2nd Mobile Device Software Development and Web Development”, MDSD@PCI’12, Piraeus, Greece, October 2012. IEEE CPS.
  • N. Pelekis, A. Gkoulalas-Divanis, M. Vodas, A. Plemenos, D. Kopanaki, Y. Theodoridis "Private-HERMES: A Benchmark Framework for Privacy-Preserving Mobility Data Querying and Mining Methods", demo paper, Proceedings of the 15th Int’l Conference on Extending Database Technology, EDBT’12, Berlin, Germany, March 2012. Springer.
  • N. Pelekis, A. Gkoulalas-Divanis, M. Vodas, D. Kopanaki, Y. Theodoridis "Privacy-aware Querying over Sensitive Trajectory Data", Proceedings of the 20th ACM Conference on Information and Knowledge Management, CIKM’11, Glascow, Scotland - UK, October 2011. ACM Press.
  • N. Pelekis, E. Stefanakis, I. Kopanakis, C. Zotali, M. Vodas, Y. Theodoridis "ChoroChronos.org: A GeoPortal for Movement Data and Processes", poster paper, Proceedings of the 10th Int’l Conference on Spatial Information Theory, COSIT’11, Maine, USA, September 2011.
  • Z. Yan, N. Giatrakos, V. Katsikaros, N. Pelekis and Y. Theodoridis "SeTraStream: Semantic-aware Trajectory Construction over Streaming Movement Data", In the Proceedings of the 12th International Symposium on Spatial and Temporal Databases (SSTD11), Minneapolis, U.S.A., 2011. Springer.
  • N. Pelekis, I. Kopanakis, C. Panagiotakis and Y. Theodoridis "Unsupervised Trajectory Sampling", In the Proceedings of the ECML PKDD 2010 European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML-PKDD’10), LNAI 6323, pp. 17--33. Springer, Heidelberg, Barcelona, Spain, 2010. Springer.
  • L. Leonardi, G. Marketos, E. Frentzos, N. Giatrakos, S. Orlando, N. Pelekis, A. Raffaetà, A. Roncato, C. Silvestri, Y. Theodoridis "T-Warehouse: Visual OLAP Analysis on Trajectory Data", In the Proceedings of the 26th IEEE International Conference on Data Engineering (ICDE’10), Long Beach, California, 2010. IEEE CS Press.
  • N. Pelekis, I. Kopanakis, E. Kotsifakos, E. Frentzos and Y. Theodoridis "Clustering Trajectories of Moving Objects in an Uncertain World", In the Proceedings of the IEEE International Conference on Data Mining (ICDM’09), Miami, U.S.A., 2009. IEEE CS Press. Best application paper award.
  • G. Kellaris, N. Pelekis, and Y. Theodoridis "Trajectory Compression under Network Constraints", In the Proceedings of the 11th International Symposium on Spatial and Temporal Databases (SSTD09), Aalborg, Denmark, 2009. Springer.
  • C. Panagiotakis, N. Pelekis, and I. Kopanakis "Trajectory Voting and Classification based on Spatiotemporal Similarity in Moving Object Databases", In the Proceedings of the 8th International Symposium on Intelligent Data Analysis (IDA’09), Lyon, France, 2009. Springer.
  • V. Tsikolidaki, N. Pelekis, and Y. Theodoridis "GF-MINER: A Genetic Fuzzy Classifier for Numerical Data", In the Proceedings of the 5th IFIP Conference on Artificial Intelligence Applications & Innovations (AIAI09), Thessaloniki, Greece, 2009. Springer.
  • R. Ortale, E. Ritacco, N. Pelekis, R. Trasarti, G. Costa, F. Giannotti, G. Manco, C. Renso, and Y. Theodoridis "The DAEDALUS Framework: Progressive Querying and Mining of Movement Data", In the Proceedings of the 16th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACM GIS’08), Irvine, CA, USA, 2008. ACM Press.
  • D. K. Iakovidis, N. Pelekis, E. Kotsifakos, and I. Kopanakis "Intuitionistic Fuzzy Clustering with Applications in Computer Vision", In the Proceedings of the International Conference on Advanced Concepts for Intelligent Vision Systems (ACIVS’08), LNCS 5259, pp. 764–774, Juan-les-Pins, France, 2008.
  • R. Ortale, E. Ritacco, N. Pelekis, R. Trasarti, G. Costa, F. Giannotti, G. Manco, C. Renso, and Y. Theodoridis "DAEDALUS: A knowledge discovery analysis framework for movement data", In the Proceedings of the 16th Italian Symposium on Advanced Database Systems (SEBD’08), pp. 191-198, Mondello, Italy, 2008.
  • E. Frentzos, N. Pelekis, N. Giatrakos and Y. Theodoridis "Identifying Unknown Border Lines from Historical Spatiotemporal Data: The DIACHORON Approach", In the Proceedings of the International Conference on Telecommunications & Multimedia (TEMU’08), Ierapetra, Crete, Greece, 2008. IEEE CS Press.
  • G. Marketos, E. Frentzos, I. Ntoutsi, N. Pelekis, A. Raffaeta and Y. Theodoridis "Building Real-World Trajectory Warehouses", In the Proceedings of the 7th International ACM SIGMOD Workshop on Data Engineering for Wireless and Mobile Access (MobiDE’08), Vancouver, Canada, 2008. ACM Press.
  • N. Pelekis, E. Frentzos, N. Giatrakos and Y. Theodoridis "HERMES: Aggregative LBS via a Trajectory DB Engine", demo paper, Proceedings of ACM SIGMOD Int’l Conference on Management of Data, SIGMOD’08, Vancouver, BC, Canada, June 2008. ACM Press.
  • N. Pelekis, S. Vosinakis, T. Panayiotopoulos and Y. Theodoridis "Towards a Virtual Agent Control Architecture Using a Spatiotemporal Data Management Framework", In the Proceedings of the 4th International INTUITION Conference, pp. 153-162, Athens, 2007.
  • N. Pelekis, I. Kopanakis, I. Ntoutsi, G. Marketos, G. Andrienko and Y. Theodoridis "Similarity Search in Trajectory Databases", In the Proceedings of the 14th IEEE International Symposium on Temporal Representation and Reasoning (TIME 2007), Alicante, Spain, 2007. IEEE CS Press.
  • N. Pelekis, I. Kopanakis, I. Ntoutsi, G. Marketos and Y. Theodoridis "Mining Trajectory Databases via a Suite of Distance Operators", In the Proceedings of the IEEE ICDE workshop on Spatio-Temporal Data Mining (STDM07), Istanbul, Turkey, 2007. IEEE CS Press.
  • S. Vosinakis, N. Pelekis, Y. Theodoridis and T. Panayiotopoulos "Handling Spatial Vagueness in Virtual Agent Control", In the Proceedings of the 2nd International Conference on Computer Graphics Theory and Applications (GRAPP07), Barcelona, Spain, 2007.
  • D. K. Iakovidis,N. Pelekis, H. Karanikas, E. Kotsifakos, I. Kopanakis, and Y. Theodoridis "A Pattern Similarity Scheme for Medical Image Retrieval", In the Proceedings of the IEEE International Conference on Information Technology in Biomedicine (ITAB06), Ioannina - Epirus, Greece, October, 2006. IEEE CS Press.
  • N. Pelekis, Y. Theodoridis "Boosting Location-Based Services with a Moving Object Database Engine", In the Proceedings of the 5th International ACM SIGMOD Workshop on Data Engineering for Wireless and Mobile Access (MobiDE06), pp. 3-10, Chicago, U.S.A, 2006.
  • H. Karanikas, N. Pelekis, D. Iakovidis, I. Kopanakis, T. Mavroudakis and Y. Theodoridis "MetaOn - Ontology Driven Metadata Construction and Management for Intelligent Search in Text and Image Collections", In the Proceedings of the International DEXA Workshop on Flexible Database and Information System Technology (FlexDBIST06), IEEE CSP, Crakow, Poland, September, 2006. IEEE CS Press.
  • N. Pelekis, Y. Theodoridis, S. Vosinakis and T. Panayiotopoulos "Hermes - A Framework for Location-Based Data Management", In the Proceedings of the 10th International Conference on Extending Database Technology (EDBT06) , LNCS 3896, pp. 1130-1134, Munich, Germany, 2006. Springer.
  • E. Frentzos, K. Gratsias, N. Pelekis and Y. Theodoridis "Nearest Neighbor Search on Moving Object Trajectories", In the Proceedings of the 9th International Symposium on Spatial and Temporal Databases (SSTD05), Angra dos Reis, Brazil. Springer.
  • N. Pelekis, B. Theodoulidis and I. Kopanakis "", In the Proceedings of the 1st Int’l EDBT Workshop on Pattern Representation and Management (PaRMa’04), Heraklion-Crete, Greece, March, 2004.

    • › Abstracts, Greek Conferences

  • D. Kopanaki, N. Pelekis, A. Gkoulalas-Divanis, M. Vodas and Y. Theodoridis "A Framework for Mobility Pattern Mining and Privacy-Aware Querying of Trajectory Data", Proceedings of the 11th Hellenic Data Management Symposium, HDMS’12, Chania, Greece, 2012.
  • N. Pelekis, I. Kopanakis, C. Panagiotakis and Y. Theodoridis "Unsupervised Trajectory Sampling", Proceedings of the 10th Hellenic Data Management Symposium HDMS’11, Athens, Greece, 2011.
  • N. Pelekis, I. Kopanakis, E. Kotsifakos, E. Frentzos and Y. Theodoridis "Clustering Trajectories of Moving Objects in an Uncertain World", In the Proceedings of the 9th Hellenic Data Management Symposium (HDMS’10), Ayia Napa, Cyprus, 2010.
  • G. Marketos, E. Frentzos, N. Giatrakos, I. Ntoutsi, N. Pelekis, A. Raffaeta and Y. Theodoridis "A Framework for Trajectory Data Warehousing", In the Proceedings of the 7th Hellenic Data Management Symposium (HDMS’08), Heraklion, Crete, Greece, 2008.
  • E. Frentzos, N. Pelekis and Y. Theodoridis "Cost Models and Efficient Query Processing over Existentially Uncertain Spatial Data", In the Proceedings of the 12th Panhellenic Conference in Informatics (PCI’08), Samos, Greece, 2008.
  • E. Fanara, G. Marketos, N. Pelekis and Y. Theodoridis "Analyzing Polls and News Headlines Using Business Intelligence Techniques", In the Proceedings of the 20th National Conference of the Hellenic Company of Operational Research (EEEE’08), Spetses, Greece, 2008.
  • N. Pelekis, D. K. Iakovidis, E. Kotsifakos, H. Karanikas and I. Kopanakis "Intuitionistic Fuzzy Clustering to Information Retrieval from Cultural Databases", In the Proceedings of the 22nd International Conference on Operational Research, Prague, Czech Republic, 2007.
  • D. K. Iakovidis, E. Kotsifakos, N. Pelekis, H. Karanikas, I. Kopanakis, Thomas Mavroudakis and Y. Theodoridis "Pattern-Based Retrieval of Cultural Heritage Images", In the Proceedings of the 11th Panhellenic Conference in Informatics (PCI‘07), Rio, Greece, 2007.
  • H. Karanikas, N. Pelekis, D. Iakovidis, I. Kopanakis, T. Mavroudakis and Y. Theodoridis "Multimedia Annotation System for Intelligent Search", In the Proceedings of the International Conference on Telecommunications & Multimedia (TEMU’06), Heraklion-Crete, Greece, 2006.
  • I. Kopanakis , S. Karagiannis, N. Pelekis, H. Karanikas "Bar Chart Form Visual Data Mining Model for the Representation of Association Rules", In the Proceedings of the International Conference on Telecommunications & Multimedia (TEMU’05), Heraclion, Crete. Greece, 2005.
  • I. Kopanakis, N. Pelekis, H. Karanikas, T. Mavroudakis "Visual Techniques for the Interpretation of Data Mining Outcomes", In the Proceedings of the 10th Panhellenic Conference in Informatics (PCI‘05), LNCS 3746, pp. 25-35, Volos, Greece, 2005.
  • H. Karanikas, N. Pelekis, I. Kopanakis, T. Mavroudakis "Discovering Market Trends via Text Mining", In the Proceedings of the Scientific Congress “New Technologies & Marketing”, pp.131-138, Ierapetra, Greece, 2005.

    • › Other

  • M. Vodas, N. Pelekis, Y. Theodoridis, C. Ray, S. Petridis, A. Miliou "Efficient AIS Data Processing for Environmentally Safe Shipping", SPOUDAI, Journal of Economics and Business, Vol.63, Issue 3, 2013.
  • Β. Βερύκιος, Ά. Γκουλαλάς-Διβάνης, Γ. Θεοδωρίδης, Ν. Πελέκης "Μέθοδοι Προστασίας Ιδιωτικότητας σε Τροχιές Κινούμενων Αντικειμένων", Κεφάλαιο στο βιβλίο "Προστασία της Ιδιωτικότητας στις Τεχνολογίες Πληροφορικής και Επικοινωνιών: Τεχνικά και Νομικά Θέματα". Κ. Λαμπρινουδάκης, Λ. Μήτρου, Σ. Γκρίτζαλης, Σ. Κάτσικας (εκδ).