Nikolaos (Nikos) Konstantinou

University of Manchester

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Nikolaos Konstantinou I am a Research Fellow at the University of Manchester, School of Computer Science, Information Management Group, working in the VADA project. Before that, I was a Senior Researcher with the MCWT/NTUA Research Group and a technical manager in the Hellenic Academic Ebooks project, coordinated by the Hellenic Academic Libraries Link. Until May 2013, I was with the National Documentation Centre, part of the National Hellenic Research Foundation, and until September 2011 with the Autonomic and Grid Computing group in Athens Information Technology as a postdoc. My PhD (2010) and BSc (2004) are from the National Technical University of Athens, School of Electrical and Computer Engineering. I have participated in numerous nationally and internationally-funded research projects and worked in various positions in the software development cycle. I am a member of the Technical Chamber of Greece and a Senior Member of the IEEE. My research has resulted so far in the following publications. If you would like a copy of a paper for which the full text is not provided here, please send me an email.


  1. N. Konstantinou, D.E. Spanos Materializing the Web of Linked Data, Springer, 2015
    (slides pdf | pptx | all)
    Table of Contents

Journal Publications

  1. N. Konstantinou, D.E. Spanos, D. Kouis, N. Mitrou: An Approach for the Incremental Export of Relational Databases into RDF Graphs. Int. J. on Artificial Intelligence Tools, 24 (2), 2015
    (full text) (slides for HDMS'15) (software)
  2. D. Kouis, N. Konstantinou: Electronic Textbooks Advantages and Challenges for the Hellenic Higher Education and Publishing Community. Library Review, 63(6/7): 531-543, 2014
    (full text)
  3. N. Konstantinou, D.E. Spanos, N. Houssos, N. Mitrou: Exposing Scholarly Information as Linked Open Data: RDFizing DSpace contents. The Electronic Library, 32(6): 834-851, 2014
    Outstanding Paper Award, Emerald Literati Network Awards for Excellence 2015
    (full text) (software) (Outstanding Paper Award)
  4. N. Konstantinou: Converting Raw Sensor Data to Semantic Web Triples: A Survey of Implementation Options. Int. J. of Sensors, Wireless Communications and Control, 2(1): 44-52, 2012
    (full text)
  5. N. Konstantinou: Expowave: An RFID anti-collision algorithm for dense and lively environments. IEEE Transactions on Communications, 60(2): 352-356, February 2012
    (full text) (software)
  6. D.E. Spanos, P. Stavrou, N. Konstantinou, N. Mitrou: SensorStream: A Semantic Real-Time Stream Management System. Int. J. of Ad Hoc and Ubiquitous Computing, 11(2/3): 178-193, 2012
    (full text)
  7. N. Kefalakis, J. Soldatos, N. Konstantinou, N. Prasad: APDL: A Reference XML Schema for Process-centered Definition of RFID Solutions. Int. J. of Systems and Software, 84(7): 1244-1259, Elsevier, 2011
    (full text)
  8. N. Konstantinou, D.E. Spanos, P. Stavrou, N. Mitrou: Technically Approaching the Semantic Web Bottleneck. Int. J. of Web Engineering and Technology, 6(1): 83-111, 2010
    (full text)
  9. N. Konstantinou, E. Solidakis, A. Zafeiropoulos, P. Stathopoulos, N. Mitrou: A Context-aware Middleware for Real-Time Semantic Enrichment of Distributed Multimedia Metadata. Int. J. of Multimedia Tools and Applications, Springer, special issue on Data Semantics for Multimedia Systems, 46(2): 425-461, January 2010
    (full text)
  10. A. Zafeiropoulos, I. Papaioannou, E. Solidakis, N. Konstantinou, P. Stathopoulos, N. Mitrou: Exploiting Bluetooth for deploying indoor LBS over a localization infrastructure independent architecture. Int. J. of Computer Aided Engineering and Technology, special issue on Smart Homes: Technologies and Applications, 2(2): 145-163, 2010
    (full text)
  11. N. Konstantinou, D.E. Spanos, N. Mitrou: Ontology and Database Mapping: A Survey of Current Implementations and Future Directions. Journal of Web Engineering, 7(1): 1-24, March 2008
    (full text)

Book Chapters

  1. A. Zafeiropoulos, D.E. Spanos, S. Arkoulis, N. Konstantinou, N. Mitrou: Data Management in Sensor Networks Using Semantic Web Technologies. In book "Data Management in Semantic Web", Nova Publishers, 2011
    (full text)

Conference Publications

  1. N. Konstantinou, M. Koehler, E. Abel, C. Civili, B. Neumayr, E. Sallinger, A. Fernandes, G. Gottlob, J. Keane, L. Libkin, N. Paton: The VADA Architecture for Cost-Effective Data Wrangling. Int. Conf. on Management of Data (SIGMOD'17), ACM, Chicago, IL, USA, May 2017.
    (full text) (poster) (screencast)
  2. N. Konstantinou, D. Kouis, N. Mitrou: Incremental Export of Relational Database Contents into RDF Graphs. 4th Int. Conf. on Web Intelligence, Mining and Semantics (WIMS'14), ACM, Thessaloniki, Greece, June 2014
    (full text) (slides) (software)
  3. N. Konstantinou, D.E. Spanos, N. Mitrou: Transient and persistent RDF views over relational databases in the context of digital repositories. 7th Metadata and Semantics Research Conference (MTSR'13), Springer, CCIS 390, pp. 342-354, Thessaloniki, Greece, November 2013
    (full text) (slides) (software) (datasets, mapping files, queries)
  4. N. Konstantinou, N. Houssos, A. Manta: Exposing Bibliographic Information as Linked Open Data using Standards-based Mappings: Methodology and Results. 3rd Int. Conf. on Integrated Information (IC-ININFO'13), Elsevier, Prague, Czech Republic, September 2013
    (full text) (slides) (software)
  5. C. Doulaverakis, N. Konstantinou, T. Knape, I. Kompatsiaris, J. Soldatos: An approach to Intelligent Information Fusion in Sensor Saturated Urban Environments. European Intelligence and Security Informatics Conference (EISIC 2011), IEEE, Athens, Greece, September 2011
    (full text) (slides)
  6. A. Zafeiropoulos, N. Konstantinou, S. Arkoulis, D.E. Spanos, N. Mitrou: A Semantic-based Architecture for Sensor Data Fusion. 2nd Int. Conf. on Mobile Ubiquitous Computing, Systems, Services and Technologies (UBICOMM'08), IEEE, Valencia, Spain, 2008
    (full text) (slides)
  7. N. Konstantinou, E. Solidakis, S. Zoi, A. Zafeiropoulos, P. Stathopoulos, N. Mitrou: Priamos: A Middleware Architecture for Real-Time Semantic Annotation of Context Features. 3rd Int. Conf. on Intelligent Environments (IE'07), IET, Ulm, Germany, 2007
    (full text) (slides)
  8. A. Zafeiropoulos, E. Solidakis, S. Zoi, N. Konstantinou, P. Papageorgiou, P. Stathopoulos, N. Mitrou: A lightweight approach for providing Location Based Content Retrieval. 18th Int. Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'07), IEEE, Athens, Greece, 2007
    (full text) (slides)
  9. A. Zafeiropoulos, E. Solidakis, S. Zoi, N. Konstantinou, P. Stathopoulos, N. Mitrou: Location Based Guidance Services in a Museum Environment: Deployment Issues and a proposed architectural approach. Int. Conf. on Wireless Information Networks and Systems (WINSYS'07), Barcelona, Spain, 2007
    (full text)
  10. N. Konstantinou, D. Spanos, M. Chalas, E. Solidakis, N. Mitrou: VisAVis: An Approach to an Intermediate Layer between Ontologies and Relational Database Contents. Int. CAISE Workshop on Web Information Systems Modeling (WISM'06), Luxembourg, 2006
    (full text) (slides) (software)
  11. E. Solidakis, N. Konstantinou, E. Pashou, A. Papakonstantinou, N. Mitrou: A Decentralized Multi-Agent Ontology-Based System for Information Retrieval. Int. WWW Workshop on Semantic Web Annotations for Multimedia (SWAMM'06), Edinburgh, Scotland, 2006
    (full text)
  12. P. Stathopoulos, V. Zoi, N. Konstantinou, E. Solidakis, C. Basios, T. Zafeiropoulos, P. Papageorgiou, N. Mitrou: E-Museum - A content management system for providing museum visitors with personalized audiovisual information. 3rd Int. Conf. of Museology, Mytilene, Greece, 2006
    (full text)

Honors & Awards

  1. Outstanding Paper Award, Emerald Literati Network Awards for Excellence 2015, for the paper Exposing Scholarly Information as Linked Open Data: RDFizing DSpace contents, with D.E. Spanos, N. Houssos, and N. Mitrou, published in The Electronic Library, 32 (6): 834-851, 2014
    (full text) (software) (Outstanding Paper Award)
  2. IEEE membership status elevated to Senior Member, the highest grade for which IEEE members can apply, for significant performance over a period of more than five years in professional practice for more than ten years.


  1. Nikolaos Konstantinou: Σημασιολογικός Εμπλουτισμός της Πληροφορίας σε Σχεσιακές Βάσεις Δεδομένων και Συστήματα με Επίγνωση Περιβάλλοντος, National Technical University of Athens, School of Electrical and Computer Engineering, Multimedia Communications and Web Technologies Research Group, 2009
    (πλήρες κείμενο) (διαφάνειες)
  2. Nikolaos Konstantinou: Διαδραστική Επεξεργασία Πληροφορίας μέσω Διαδικτύου, National Technical University of Athens, School of Electrical and Computer Engineering, 2003
    (πλήρες κείμενο)

Other Publications

  1. D. Kouis, S. Christaki, S. Koutsileou, C. Anastasopoulou, G. Veranis, C. Vratti, E. Gousouli, A. Dimou, K. Diakonikolaou, K. Eleftheriadis, E. Zekou, M. Thanou, N. Konstantinou, F. Loari, C. Bliatsiou, V. Polychronopoulos, D.E. Spanos, R. Tampakopoulou, N. Mitrou: «Κάλλιπος» - Το μεγαλύτερο ψηφιακό Αποθετήριο Ακαδημαϊκών Ηλεκτρονικών Συγγραμμάτων Ανοικτής Πρόσβασης. HealJournal - Περιοδικό Ελληνικών Ακαδημαϊκών Βιβλιοθηκών, 2 (1): 10-28, 2016
    (full text) (epub) (repository)
  2. N. Konstantinou, D.E. Spanos, D. Kouis, N. Mitrou: An Approach for the Incremental Export of Relational Databases into RDF Graphs (as published in IJAIT). 13th Hellenic Data Management Symposium (HDMS'15), Athens, Greece, July 2015
    (full text) (slides) (software)
  3. N. Mitrou, N. Konstantinou, D. Kouis, P. Stavrou, D.E. Spanos: HEAL-Link activities and plans on annotating, organizing and linking academic content. In the Semantic Web in Libraries Conference (SWIB'13), Hamburg, Germany, November 2013
  4. D. Kouis, N. Konstantinou, C. Bliatsiou, N. Mitrou: Ολοκληρωμένο περιβάλλον για την δημιουργία και προβολή σύγχρονων ηλεκτρονικών ακαδημαϊκών συγγραμμάτων. Στο 22ο Πανελλήνιο Συνέδριο Ακαδημαϊκών Βιβλιοθηκών – Επιστροφή στο μέλλον: οι αξίες του παρελθόντος οδηγοί για το μέλλον, Patra, October 2013
  5. N. Konstantinou, D. Kouis, I. Voulgari, N. Mitrou: Μεταδεδομένα Μαθησιακών Αντικειμένων: Προκλήσεις, δυνατότητες και διαθέσιμες επιλογές. Στο 22ο Πανελλήνιο Συνέδριο Ακαδημαϊκών Βιβλιοθηκών – Επιστροφή στο μέλλον: οι αξίες του παρελθόντος οδηγοί για το μέλλον, Patra, October 2013
  6. D. Kouis, N. Konstantinou, N. Mitrou: Open access scientific content services for the Greek higher education: An overview and future developments. Int. Open Access Conf. @ EKT - Towards Common European Policies for Innovative Reuse of Public Sector and Scientific Information, Athens, October 2013
  7. K. Stamatis, N. Konstantinou, A. Manta, C. Paschou, N. Houssos: Biblio-transformation-engine: An open source framework and use cases in the digital libraries domain. 7th Int. Conf. on Open Repositories (OR'2012), Edinburgh, Scotland, July 2012
    (full text) (slides) (software)
  8. N. Konstantinou, N. Houssos: Proactive personalized self-archiving. 7th Int. Conf. on Open Repositories (OR'2012), Edinburgh, Scotland, July 2012


  1. Software Engineering. University of Manchester (spring, fall 2016)
  2. Knowledge Organization and Management on the World Wide Web. Harokopio University (spring 2015)
  3. Computational Methods in Geoinformatics. National Technical University of Athens (fall 2014)
  4. Computer Networks. School of Pedagogical and Technological Education (spring 2014)


  1. Talk at the National Documentation Center / National Hellenic Research Foundation: Publishing Data Using Semantic Web Technologies: An Introduction for Software Engineers, November 2011
  2. Research Seminar at AIT: From Sensor Data to Triples: Information Flow in Semantic Sensor Networks, March 2011
  3. Invited talk at the National Center for Scientific Research Demokritos, Institute of Informatics and Telecommunications: Μια προσέγγιση βασισμένη σε κανόνες για τη σημασιολογική επισημείωση πραγματικού χρόνου σε συστήματα με επίγνωση περιβάλλοντος, January 2010

Reviewing Activity

  1. Int. Conf. on on Metadata and Semantics Research (MTSR), Program Committee 2016
  2. Sensors, MDPI, 2011-2016
  3. Int. Conf. on Internet of Things and Big Data (IoTBD), Program Committee, 2016
  4. Transactions on Information Forensics & Security, IEEE, 2015
  5. Int. J. of Geo-Information, MDPI, 2015
  6. Arabian Journal for Science and Engineering, Springer, 2015
  7. Int. Conf. on Integrated Information (IC-ININFO), 2013-2014
  8. Computer Communications, Elsevier, 2013
  9. Int. J. of Multimedia Tools and Applications, Springer, 2009-2013
  10. Int. J. of Wireless Networks, Springer, 2013
  11. Int. J. of Communication Systems, Wiley, 2013
  12. Int. J. of Sensors, Wireless Communications and Control, Guest Editor, 2012
  13. Int. J. of Distributed Sensor Networks, 2012
  14. Transactions on Communications, IEEE, 2011
  15. Int. J. of Computer Mathematics, Taylor & Francis, 2011


  1. The R2RML Parser is a tool that can export relational database contents as RDF graphs, based on an R2RML mapping document.
  2. Biblio-Transformation-Engine is a java framework for filtering and modifying records from various sources, introduced here.
  3. The cerif-jpa-persistence is a java library for accessing CERIF databases with the Java Persistence API.
  4. Expowave is a theoretical framewrok that simulates an RFID reader network that is scheduled using Expowave, an algorithm introduced and analyzed here. You can use to produce random graphs that will have a probability d of being connected to each other. The randomly-generated included graph names denote the number of nodes and d. In order to perform simulation experiments, you have to tweak according to your needs. In short, you can obtain simulation measurements about a node, about the whole graph, or mean measurements about the whole graph as σ (RFID tag birth probability) increases, for each iteration.
  5. The VisAVis Protégé plugin for mapping ontologies to databases was the diploma thesis of Dimitris Spanos and Michalis Chalas. The work was presented here. It uses the Protégé libraries to graphically represent an ontology, a database (MySQL or PostgreSQL) and the mappings between them. The plugin allows queries to be asked to the ontology and returns results from the database. To see VisAVis in action, you have to create a VisAVis folder in Protégé's plugins folder and copy the jar file along with its dependencies into VisAVis folder. Next, create a new Protégé Project and select Project -> Configure -> VisAVisTab. The plugin is tested in Protégé 3.0, 3.1, 3.1.1 and 3.2beta. To compile the source code, you have to extract the code in the plugins folder of Protégé and add to Protégé's MANIFEST.MF the two lines included in VisAVis' MANIFEST.MF.
  6. This java implementation of the board game Score4 (see wikipedia entry) was accomplished in collaboration with Panagiotis Bouros during university. You can play either with another person or with the computer. You can download the source code and the executable jar file.

Last updated on May 24th, 2017