about

I am a senior data engineer, with broad experience in software development. Between 2015 and 2021 I was with the University of Manchester, Department of Computer Science, initially as a Research Fellow, then as a Lecturer (teaching). In 2018, I co-founded a startup, The Data Value Factory, helping data users obtain insights from data. Between 2013 and 2015 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. Before that, I was with the National Documentation Centre, part of the National Hellenic Research Foundation; until 2011 I was with the Athens Information Technology, and until 2008 I worked in a number of projects of the Institute of Communication and Computer Systems. My PhD (2010) and BSc (2004) are from the National Technical University of Athens, School of Electrical and Computer Engineering.

Find me on linkedin, google scholar, and dblp.

publications

journal articles

1. A. Fernandes, M. Koehler, N. Konstantinou, P. Pankin, N. Paton, R. Sakellariou: Data Preparation: A Technological Perspective and Review, SN Computer Science, 4(425), Springer, 2023
   (full text)
2. L. Mazilu, N. Paton, N. Konstantinou, A. Fernandes: Fairness-Aware Data Integration. Journal of Data and Information Quality, 14(4), ACM, 2022
   (full text)
3. N. Konstantinou, N. Paton: Feedback Driven Improvement of Data Preparation Pipelines. Information Systems, 92(0), Elsevier, 2019
   (full text)
4. N. Konstantinou, E. Abel, L. Bellomarini, A. Bogatu, C. Civili, E. Irfanie, M. Koehler, L. Mazilu, E. Sallinger, A. Fernandes, G. Gottlob, J. Keane, N. Paton: VADA: An Architecture for End User Informed Data Preparation. Journal of Big Data, 6(74), Springer, 2019
   (full text)
5. M. Koehler, E. Abel, A. Bogatu, C. Civili, L. Mazilu, N. Konstantinou, A. Fernandes, J. Keane, L. Libkin, N. Paton: Incorporating Data Context to Cost-Effectively Automate End-to-End Data Wrangling. IEEE Transactions on Big Data, 2019
   (full text)
6. E. Abel, J. Keane, N. Paton, A. Fernandes, M. Koehler, N. Konstantinou, J. Rios, N. Azuan, S. Embury: User Driven Multi-Criteria Source Selection. Information Sciences, 430-431: 179-199, Elsevier, March 2018
   (full text)
7. 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)
8. 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)
9. 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)
10. 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)
11. 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)
12. 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)
13. 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)
14. 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)
15. 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)
16. 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)
17. 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)

conference publications

1. L. Mazilu, N. Konstantinou, N. Paton, A. Fernandes: Data Wrangling for Fair Classification. 3rd International Workshop on Processing Information Ethically: a plus for data Quality (PIE+Q) 2021, in conjunction with EDBT/ICDT 2021, Nicosia, Cyprus, March 2021
   (full text)
2. L. Mazilu, N. Paton, N. Konstantinou, A. Fernandes: Fairness in Data Wrangling. 9th IEEE International Workshop on Data Integration and Mining (DIM-2020), in conjunction with IRI-2020, Las Vegas, NV, USA, August 2020
   (full text)
3. L.P. Binamungu, S. Embury, N. Konstantinou: Characterising the Quality of Behaviour-Driven Development Specifications. 21st International Conference on Agile Software Development (XP 2020), Copenhagen, Denmark, June 2020
   (full text)
4. A. Bogatu, A. Fernandes, N. Paton, N. Konstantinou: Dataset Discovery in Data Lakes. 36th IEEE International Conference on Data Engineering (ICDE’20), Dallas, Texas, USA, April 2020
   (full text)
5. L. Mazilu, N. Konstantinou, N. Paton, A. Fernandes: Schema Mapping Generation in the Wild: A Demonstration with Open Government Data. 23rd Int. Conf. on Extending Database Technology (EDBT'20), Copenhagen, Denmark, March 2020
   (full text) (software)
6. A. Bogatu, A. Fernandes, N. Paton, N. Konstantinou: SynthEdit: Format Transformations by Example Using Edit Operations. 22nd Int. Conf. on Extending Database Technology (EDBT'19), Lisbon, Portugal, March 2019
   (full text) (poster)
7. N. Konstantinou, N. Paton: Feedback Driven Improvement of Data Preparation Pipelines. 21st Int. Workshop On Design, Optimization, Languages and Analytical Processing of Big Data (DOLAP'19), colocated with EDBT/ICDT, Lisbon, Portugal, March 2019
   (full text) (slides)
8. E. Abel, J. Keane, N. Paton, A. Fernandes, M. Koehler, N. Konstantinou, N. Azuan, S. Embury: SOURCERY: User Driven Multi-Criteria Source Selection. Conf. on Information and Knowledge Management (CIKM'18), ACM, Turin, Italy, October 2018
   Best Demo Paper
   (demo) (demo user guide) (best demo paper)
9. L.P. Binamungu, S. Embury, N. Konstantinou: Maintaining Behaviour Driven Development Specifications: Challenges and Opportunities. Int. Conf. on Software Analysis, Evolution and Reengineering (SANER'18), IEEE, Campobasso, Italy, March 2018
   (full text)
10. L.P. Binamungu, S. Embury, N. Konstantinou: Detecting Duplicate Examples in Behaviour Driven Development Specifications. 2nd Workshop on Validation, Analysis and Evolution of Software Tests (VST'18), IEEE, Campobasso, Italy, March 2018
    (full text)
11. M. Koehler, A. Bogatu, C. Civili, N. Konstantinou, E. Abel, A. Fernandes, J. Keane, L. Libkin, N. Paton: Data Context Informed Data Wrangling. Int. Conf. on Big Data (BigData'17), IEEE, Boston, MA, USA, December 2017
    (full text)
12. 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)
13. 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)
14. 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)
15. 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)
16. 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'11), IEEE, Athens, Greece, September 2011
    (full text) (slides)
17. 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)
18. 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)
19. 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)
20. 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)
21. 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)
22. 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)
23. 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)

books

1. N. Konstantinou, D.E. Spanos: Materializing the Web of Linked Data. Springer, 2015
   (slides)

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)

theses

1. N. 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. N. Konstantinou: Διαδραστική Επεξεργασία Πληροφορίας μέσω Διαδικτύου, National Technical University of Athens, School of Electrical and Computer Engineering, 2003
   (πλήρες κείμενο)

other publications

1. A. Bogatu, A. Fernandes, N. Paton, N. Konstantinou: SynthEdit: Format Transformations by Example Using Edit Operations (published in EDBT'19). 17th Hellenic Data Management Symposium (HDMS'19), Athens, Greece, July 2019
   (full text) (poster) (slides)
2. N. Konstantinou, N. Paton: Feedback Driven Improvement of Data Preparation Pipelines (published in DOLAP'19). 17th Hellenic Data Management Symposium (HDMS'19), Athens, Greece, July 2019
   (full text) (slides)
3. 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 (published in SIGMOD'17). 15th Hellenic Data Management Symposium (HDMS'17), Athens, Greece, August 2017
   (full text) (poster) (screencast)
4. 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)
5. N. Konstantinou, D.E. Spanos, D. Kouis, N. Mitrou: An Approach for the Incremental Export of Relational Databases into RDF Graphs (published in IJAIT). 13th Hellenic Data Management Symposium (HDMS'15), Athens, Greece, July 2015
   (full text) (slides) (software)
6. 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
   (slides)
7. 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
   (διαφάνειες)
8. 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
   (πόστερ)
9. 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
   (slides)
10. 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)
11. N. Konstantinou, N. Houssos: Proactive personalized self-archiving. 7th Int. Conf. on Open Repositories (OR'2012), Edinburgh, Scotland, July 2012
    (poster)

honors & awards

1. Best Demo Paper: E. Abel, J. Keane, N. Paton, A. Fernandes, M. Koehler, N. Konstantinou, N. Azuan, S. Embury: SOURCERY: User Driven Multi-Criteria Source Selection. Conf. on Information and Knowledge Management (CIKM'18), ACM, Turin, Italy, October 2018
   (demo) (demo user guide) (best demo paper)
2. Outstanding Paper Award, Emerald Literati Network Awards for Excellence 2015: 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
   (full text) (software) (Outstanding Paper Award)
3. 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.

teaching

1. Programming, Software Engineering, Algorithms and Data Structures. University of Manchester (2016-2021)
2. Knowledge Organization and Management on the World Wide Web. Harokopio University (2015)
3. Computational Methods in Geoinformatics. National Technical University of Athens (2014)
4. Computer Networks. School of Pedagogical and Technological Education (2014)

software

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 RandomGraphGenerator.java 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 Simulation.java 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.