Christos Doulkeridis
Phone +30 210-4142545
Email cdoulk@unipi.gr
Title Associate Professor
Office Hours Monday 11:15-12:45, Friday 11:15-12:45
Office 502 (Gr. Lambraki 126)
Courses Information Retrieval — 8th semester
Data Analytics — 4th semester
Data Structures — 3rd semester
Data Processing Techniques — 7th semester

Brief CV

Christos Doulkeridis is Associate Professor in the department of Digital Systems of University of Piraeus. He has been awarded Marie-Curie and ERCIM “Allain Bensoussan” fellowships for post-doctoral studies at the Norwegian University of Science and Technology in 2011 and 2009 respectively. Prior to this, he received his Ph.D and M.Sc. from the Athens University of Economics and Business in 2007 and 2003 respectively, and an Electrical and Computer Engineer degree from the National Technical University of Athens in 2001. He was the second winner of “Michael Dertouzos” competition on “IT with a human face” in the 14th World Congress on Information Technology (WCIT’04) in 2004. Also, he has received the best paper award at EuroVA’19, and he belonged to the winning team in the SemEval’17/Task4 competition on sentiment analysis on Twitter data. He was the principal investigator of CloudIX (Marie-Curie Post-Doc) and RoadRunner (GSRT/ARISTEIA II), and he has participated in several EU research projects (datAcron, Track&Know, BigDataStack). Currently, he is the principal investigator of CHOROLOGOS (GSRT/HFRI), working on processing/indexing semantic spatio-temporal-textual data. His research interests include “Big Data”, cloud data management, query processing, data management in peer-to-peer networks, distributed knowledge discovery, web data management, mobile and spatial databases. He has published in top international journals (incl. VLDB J, IEEE TKDE, IEEE J-SAC, ACM TKDD, Elsevier Information Systems, Springer DPD) and conferences (incl. ACM SIGMOD, VLDB, ICDE, EDBT, SSTD, PKDD, SIAM SDM) in the areas of data management, knowledge discovery and distributed systems.

Publications

Publications 2015 – 2022

I) JOURNALS

  • Georgios M. Santipantakis, Konstantinos I. Kotis, Apostolos Glenis, George A. Vouros, Christos Doulkeridis, Akrivi Vlachou. RDF-Gen: Generating RDF Triples from Big Data Sources. In Knowledge and Information Systems (KAIS) journal, Vol. , Issue , pages , 2022.
  • Panagiotis Nikitopoulos, Akrivi Vlachou, Christos Doulkeridis, George A. Vouros. Parallel and Scalable Processing of Spatio-temporal RDF Queries using Spark. In GeoInformatica (Springer), Vol. 25, Issue , pages 623-653, 2021.
  • Christos Doulkeridis, Akrivi Vlachou, Nikos Pelekis, Yannis Theodoridis. A Survey on Big Data Processing Frameworks for Mobility Analytics. In SIGMOD Record, Vol. 50, Issue 2, pages 18-29, 2021.
  • Nikolaos Koutroumanis, Georgios M. Santipantakis, Apostolos Glenis, Christos Doulkeridis, George A. Vouros. Scalable Enrichment of Mobility Data with Weather Information. In GeoInformatica (Springer), Vol. 25, Issue , pages 291-309, 2021.
  • Panagiotis Nikitopoulos, Georgios A. Sfyris, Akrivi Vlachou, Christos Doulkeridis, Orestis Telelis. Pruning Techniques for Parallel Processing of Reverse Top-k Queries. In Distributed and Parallel Databases, Vol. 39, Issue 1, pages 169-199, March 2021.
  • Georgios M. Santipantakis, Apostolos Glenis, Kostas Patroumpas, Akrivi Vlachou, Christos Doulkeridis, George A. Vouros, Nikos Pelekis, Yannis Theodoridis. SPARTAN: Semantic Integration of Big Spatio-temporal Data from Streaming and Archival Sources. In Future Generation Computer Systems (Springer), Vol. 110, Issue , pages 540-555, September 2020.
  • Panagiotis Tampakis, Christos Doulkeridis, Nikos Pelekis, Yannis Theodoridis. Distributed Subtrajectory Join on Massive Datasets. In ACM Transactions on Spatial Algorithms and Systems, Vol. 6, Issue 2, pages 8:1-8:29, February 2020.
  • Christos Doulkeridis, Qiang Qu, George A. Vouros and João B. Rocha-Junior. Guest Editorial: Special issue on mobility analytics for spatio-temporal and social data. In GeoInformatica (Springer), Vol. 23, Issue 3, pages 323-327, 2019.
  • George A. Vouros, Georgios M. Santipantakis, Christos Doulkeridis, Akrivi Vlachou, Gennady L. Andrienko, Natalia V. Andrienko, Georg Fuchs, Jose Manuel Cordero Garcia, Miguel Garcia Martinez. The datAcron Ontology for the Specification of Semantic Trajectories – Specification of Semantic Trajectories for Data Transformations Supporting Visual Analytics. In Journal on Data Semantics (Springer), Vol. 8, Issue 4, pages 235-262, 2019.
  • Nikos Pelekis, Panagiotis Tampakis, Marios Vodas, Christos Doulkeridis, Yannis Theodoridis. On temporal-constrained sub-trajectory cluster analysis. In Data Mining and Knowledge Discovery, Vol. 31, Issue 5, pages 1294-1330, 2017.
  • Konstantinos Georgoulas, Akrivi Vlachou, Christos Doulkeridis, Yannis Kotidis. User-centric Similarity Search. In IEEE Transactions on Knowledge and Data Engineering (TKDE), Vol. 29, Issue 1, pages 200-213, 2017.
  • Orestis Gkorgkas, Akrivi Vlachou, Christos Doulkeridis and Kjetil Nørvåg. Exploratory Product Search using Top-k Join Queries. In Information Systems, Vol. 64, Issue , pages 75-92, 2017.
  • Dimitris Pertesis, Christos Doulkeridis. Efficient Skyline Query Processing in SpatialHadoop. In Information Systems, Vol. 54, Issue , pages 325-335, 2015.

II) CONFERENCES

  • Akrivi Vlachou, Christos Doulkeridis, João B. Rocha-Junior and Kjetil Nørvåg. On Decisive Skyline Queries. In Proceedings of 24th International Conference on Big Data Analytics and Knowledge Discovery (DaWaK’22), Vienna, Austria, August 22-24, 2022.
  • Fragkiskos Gryllakis, Nikos Pelekis, Christos Doulkeridis, Iraklis Varlamis and Yannis Theodoridis. Social Spatio-temporal Keyword Pattern (S2KP) Queries in Multiple Aspect Trajectories Databases. In Proceedings of 34th International Conference on Scientific and Statistical Database Management (SSDBM’22), Copenhagen, Denmark, July 6 – 8, 2022.
  • Nikolaos Koutroumanis, Christos Doulkeridis and Akrivi Vlachou. Tearing Down the Tower of Babel: Unified and Efficient Spatio-temporal Queries for NoSQL Stores. In Proceedings of 23rd International Conference on Mobile Data Management (MDM’22), Paphos, Cyprus (Online), June 6-9, 2022.
  • Panagiotis Tampakis, Dimitris Spyrellis, Christos Doulkeridis, Nikos Pelekis, Christos Kalyvas and Akrivi Vlachou. A Novel Indexing Method for Spatial-Keyword Range Queries. In Proceedings of 17th International Symposium on Spatial and Temporal Databases (SSTD’21), Online, August 23-25, 2021. Best Research Paper Award
  • Nikolaos Koutroumanis, Nikolaos Kousathanas, Christos Doulkeridis, Akrivi Vlachou. Declarative Querying of Heterogeneous NoSQL Stores. In Proceedings of 2nd VLDB Workshop on Search, Exploration, and Analysis in Heterogeneous Datastores (SEA-Data 2021), pp.42-43, Copenhagen, Denmark, August 20, 2021.
  • Nikolaos Koutroumanis, Nikolaos Kousathanas, Christos Doulkeridis, Akrivi Vlachou. A Demonstration of NoDA: Unified Access to NoSQL Stores. In Proceedings of 47th International Conference on Very Large Data Bases (VLDB’21), Copenhagen, Denmark, August 16-20, 2021.
  • Andreas Tritsarolis, Christos Doulkeridis, Nikos Pelekis, Yannis Theodoridis. ST_VISIONS: A Python Library for Interactive Visualization of Spatio-temporal Data. In Proceedings of 22nd International Conference on Mobile Data Management (MDM’21) – demo track, Toronto, Canada (Virtual), June 15-18, 2021.
  • Nikolaos Koutroumanis, Christos Doulkeridis. Scalable Indexing and Querying of Spatio-temporal Data in NoSQL Stores. In Proceedings of 24th International Conference on Extending Database Technology (EDBT’21), Nicosia, Cyprus, March 23-26, 2021.
  • Georgios M. Santipantakis, George A. Vouros, Christos Doulkeridis. Coronis: Towards Integrated and Open COVID-19 Data. In Proceedings of 24th International Conference on Extending Database Technology (EDBT’21) – demo track, Nicosia, Cyprus, March 23-26, 2021.
  • Akrivi Vlachou, Christos Doulkeridis, Nikolaos Koutroumanis, Dimitrios Poulopoulos and Kjetil Nørvåg. The SPADES Framework for Scalable Management of Spatio-textual Data. In Proceedings of 24th Panhellenic Conference on Informatics (PCI’20), Athens, Greece, November 20-22, 2020.
  • Yannis Poulakis, Christos Doulkeridis, Dimosthenis Kyriazis. AutoClust: A Framework for Automated Clustering based on Cluster Validity Indices. In Proceedings of 20th IEEE International Conference on Data Mining (ICDM’20), Sorrento, Italy, November 17-20, 2020.
  • Stella Maropaki, Sean Chester, Christos Doulkeridis and Kjetil Nørvåg. Diversifying Top-k Point-of-Interest Queries via Collective Social Reach. In Proceedings of 29th ACM Conference on Information and Knowledge Management (CIKM’20), , October 19-23, 2020.
  • George A. Vouros, Apostolos Glenis, Christos Doulkeridis. The δ big data architecture for mobility analytics. In Proceedings of 6th IEEE International Conference on Big Data Computing Service and Machine Learning Applications(IEEE BigDataService’20), Keble College, Oxford, United Kingdom, April 13-16, 2020.
  • Panagiotis Tampakis, Nikos Pelekis, Christos Doulkeridis, Yannis Theodoridis. Scalable Distributed Subtrajectory Clustering. In Proceedings of 2019 IEEE International Conference on Big Data (IEEE BigData’19), Los Angeles, CA, USA, December 9-12, 2019.
  • Efthimis Tsilionis, Nikolaos Koutroumanis, Panagiotis Nikitopoulos, Christos Doulkeridis, Alexander Artikis. Online Event Recognition from Moving Vehicles: Application Paper. In Proceedings of 35th International Conference on Logic Programming (ICLP’19), pp.841-856, Las Cruces, New Mexico, USA, September 20-25, 2019.
  • Nikolaos Koutroumanis, Panagiotis Nikitopoulos, Akrivi Vlachou, Christos Doulkeridis, “NoDA: Unified NoSQL Data Access Operators for Mobility Data”, In Proceedings of 16th International Symposium on Spatial and Temporal Databases (SSTD’19), pp.174-177, Vienna, Austria, August 19-21, 2019.
  • Petros Petrou, Panagiotis Nikitopoulos, Panagiotis Tampakis, Apostolos Glenis, Nikolaos Koutroumanis, Georgios M. Santipantakis, Kostas Patroumpas, Akrivi Vlachou, Harris V. Georgiou, Eva Chondrodima, Christos Doulkeridis, Nikos Pelekis, Gennady L. Andrienko, Fabian Patterson, Georg Fuchs, Yannis Theodoridis, George A. Vouros.”ARGO: A Big Data Framework for Online Trajectory Prediction”, In Proceedings of 16th International Symposium on Spatial and Temporal Databases (SSTD’19), pp.194-197, Vienna, Austria, August 19-21, 2019.
  • Georgios M. Santipantakis, Apostolos Glenis, Christos Doulkeridis, Akrivi Vlachou, George A. Vouros, “stLD: towards a spatio-temporal link discovery framework”, In Proceedings of International Workshop on Semantic Big Data (SBD’19, in conjunction with SIGMOD’19), pp.4:1-4:6, Amsterdam, The Netherlands , July 5, 2019.
  • Siming Chen, Gennady L. Andrienko, Natalia V. Andrienko, Christos Doulkeridis, Athanasios Koumparos. “Contextualized Analysis of Movement Events”, In Proceedings of EuroVis Workshop on Visual Analytics (EuroVA’19), pp.49-53, Porto, Portugal, June 3, 2019.
  • Panagiotis Nikitopoulos, Georgios A. Sfyris, Akrivi Vlachou, Christos Doulkeridis, Orestis Telelis. “Parallel and Distributed Processing of Reverse Top-k Queries”, In Proceedings of 35th IEEE International Conference on Data Engineering (ICDE’19), Macau SAR, China, April 8-12, 2019.
  • Akrivi Vlachou, Christos Doulkeridis, Apostolos Glenis, Georgios M. Santipantakis, George A. Vouros, “Efficient Spatio-temporal RDF Query Processing in Large Dynamic Knowledge Bases”, In Proceedings of The 34th ACM/SIGAPP Symposium On Applied Computing (SAC’19), Limassol, Cyprus, April 8-12, 2019.
  • Nikolaos Koutroumanis, Apostolos Glenis, Georgios M. Santipantakis, Christos Doulkeridis, George A. Vouros. “Integration of Mobility Data with Weather Information”, In Proceedings of International Workshop on Big Mobility Data Analytics (BMDA’19), Lisbon, Portugal, March 26, 2019.
  • Panagiotis Nikitopoulos, Aris-Iakovos Paraskevopoulos, Christos Doulkeridis, Nikos Pelekis, Yannis Theodoridis. “Hot Spot Analysis over Big Trajectory Data”. In Proceedings of 2018 IEEE International Conference on Big Data (IEEE BigData’18), Seattle, WA, USA, December 10-13, 2018.
  • Georgios M. Santipantakis, Akrivi Vlachou, Christos Doulkeridis, Alexander Artikis, Ioannis Kontopoulos, George A. Vouros. “A Stream Reasoning System for Maritime Monitoring”. In Proceedings of 25th International Symposium on Temporal Representation and Reasoning (TIME’18), Warsaw, Poland, October 15-17, 2018.
  • Dimosthenis Kyriazis, Christos Doulkeridis, Panagiotis Gouvas, Ricardo Jiménez-Peris, Ana Juan Ferrer, Leonidas Kallipolitis, Pavlos Kranas, George Kousiouris, Craig Macdonald, Richard McCreadie, Yosef Moatti, Apostolos Papageorgiou, Marta Patiño-Martínez, Stathis Plitsos, Dimitrios Poulopoulos, Antonio Paradell, Amaryllis Raouzaiou, Paula Ta-Shma, Valerio Vianello. “BigDataStack: A Holistic Data-Driven Stack for Big Data Applications and Operations”. In Proceedings of 2018 IEEE International Congress on Big Data (BigDataCongress’18), San Francisco, CA, USA, July 2-7, 2018.
  • Georgios M. Santipantakis, Konstantinos I. Kotis, George A. Vouros, Christos Doulkeridis. “RDF-Gen: Generating RDF from Streaming and Archival Data”. In Proceedings of 8th International Conference on Web Intelligence, Mining and Semantics (WIMS’18), Novi Sad, Serbia, June 25-27, 2018.
  • George A. Vouros, Akrivi Vlachou, Georgios M. Santipantakis, Christos Doulkeridis, Nikos Pelekis, Harris V. Georgiou, Yannis Theodoridis, Kostas Patroumpas, Elias Alevizos, Alexander Artikis, Georg Fuchs, Michael Mock, Gennady L. Andrienko, Natalia V. Andrienko, Christophe Claramunt, Cyril Ray, Elena Camossi, Anne-Laure Jousselme. “Increasing Maritime Situation Awareness via Trajectory Detection, Enrichment and Recognition of Events”. In Proceedings of 16th International Symposium on Web and Wireless Geographical Information Systems (W2GIS’18), A Coruna, Spain, May 21-22, 2018.
  • George A. Vouros, Akrivi Vlachou, Georgios M. Santipantakis, Christos Doulkeridis, Nikos Pelekis, Harris Georgiou, Yannis Theodoridis, Kostas Patroumpas, Elias Alevizos, Alexander Artikis, Georg Fuchs, Michael Mock, Gennady Andrienko, Natalia Andrienko, Christophe Claramunt, Cyril Ray, Elena Camossi, Anne-Laure Jousselme, David Scarlatti, Jose-Manuel Cordero. “Big Data Analytics for Time Critical Mobility Forecasting: Recent Progress and Research Challenges”. In Proceedings of 21st International Conference on Extending Database Technology (EDBT’18), Vienna, Austria, March 26-29, 2018.
  • Panagiotis Nikitopoulos, Akrivi Vlachou, Christos Doulkeridis, George A. Vouros. “DiStRDF: Distributed Spatio-temporal RDF Queries on Spark”. In Proceedings of International Workshop on Big Mobility Data Analytics (BMDA’18), Vienna, Austria, March 26, 2018.
  • Georgios M. Santipantakis, Apostolos Glenis, Nikolaos Kalaitzian, Akrivi Vlachou, Christos Doulkeridis, George A. Vouros. “FAIMUSS: Flexible Data Transformation to RDF from Multiple Streaming Sources”. In Proceedings of 21st International Conference on Extending Database Technology (EDBT’18) – demo track, Vienna, Austria, March 26-29, 2018.
  • Fragkiskos Gryllakis, Nikos Pelekis, Christos Doulkeridis, Stylianos Sideridis, Yannis Theodoridis. “Spatio-Temporal-Keyword Pattern Queries over Semantic Trajectories with Hermes@Neo4j”. In Proceedings of 21st International Conference on Extending Database Technology (EDBT’18) – demo track, Vienna, Austria, March 26-29, 2018.
  • Christos Doulkeridis, Nikos Pelekis, Yannis Theodoridis, George A. Vouros. “Big Data Management and Analytics for Mobility Forecasting in datAcron”. In Proceedings of 1st International Workshop on Big Data Management in European Projects (EuroPro’17), Venice, Italy, March 21, 2017.
  • Georgios M. Santipantakis, George A. Vouros, Apostolos Glenis, Christos Doulkeridis, Akrivi Vlachou. “The datAcron Ontology for Semantic Trajectories”. In Proceedings of 14th International Conference on Extending the Semantic Web (ESWC’17), pp.26-30, Portorož, Slovenia, May 28 – June 1, 2017.
  • Georgios M. Santipantakis, George A. Vouros, Christos Doulkeridis, Akrivi Vlachou, Gennady L. Andrienko, Natalia V. Andrienko, Georg Fuchs, Jose Manuel Cordero Garcia, Miguel Garcia Martinez. “Specification of Semantic Trajectories Supporting Data Transformations for Analytics: The datAcron Ontology”. In Proceedings of 13th International Conference on Semantic Systems (SEMANTICS’17), pp.17-24, Amsterdam, The Netherlands, September 11-14, 2017.
  • Fragkiskos Gryllakis, Nikos Pelekis, Christos Doulkeridis, Stylianos Sideridis, Yannis Theodoridis. “Searching for Spatio-Temporal-Keyword Patterns in Semantic Trajectories”. In Proceedings of 16th International Symposium on Advances in Intelligent Data Analysis (IDA’17), pp.112-124, London, UK, October 26-28, 2017.
  • Christos Baziotis, Nikos Pelekis, Christos Doulkeridis. “DataStories at SemEval-2017 Task 4: Bidirectional LSTM with Attention for Message-level and Topic-based Sentiment Analysis”. In Proceedings of 11th International Workshop on Semantic Evaluation (SemEval 2017), Vancouver, Canada, August 3-4, 2017.
  • Christos Baziotis, Nikos Pelekis, Christos Doulkeridis. “DataStories at SemEval-2017 Task 6: Siamese Bidirectional LSTM with Attention for Humorous Text Comparison”. In Proceedings of 11th International Workshop on Semantic Evaluation (SemEval 2017), Vancouver, Canada, August 3-4, 2017.
  • Doulkeridis C, Vlachou A, Mpestas D, Mamoulis N, “Parallel and Distributed Processing of Spatial Preference Queries using Keywords”, Proceedings of 20th International Conference on Extending Database Technology (EDBT’17), Venice, Italy, March 21-24, 2017.
  • Saouk M, Doulkeridis C, Vlachou A, Nørvåg K, “Efficient Processing of Top-k Joins in MapReduce”, Proceedings of IEEE International Conference on Big Data (IEEE BigData’16), Washington D.C., USA, December 5-8, 2016.
  • Nikitopoulos P, Paraskevopoulos A-I., Doulkeridis C, Pelekis N, Theodoridis Y, “BigCAB: Distributed Hot Spot Analysis over Big Spatio-temporal Data using Apache Spark (GIS Cup)”, Proceedings of 24th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACM SIGSPATIAL 2016), Francisco Bay Area, California, USA, October 31 – November 3, 2016.
  • Karanasou M, Ampla A, Doulkeridis C, Halkidi M, “Scalable and Real-time Sentiment Analysis on Twitter Data”, Proceedings of 6th ICDM Workshop on Sentiment Elicitation from Natural Text for Information Retrieval and Extraction (SENTIRE’16), Barcelona, Spain, December 12, 2016.
  • Sfyris G.A, Fragkos N, Doulkeridis C, “Profile-Based Selection of Expert Groups”, Proceedings of 20th International Conference on Theory and Practice of Digital Libraries (TPDL’16), pp.81-93, Hannover, Germany, September 5-9, 2016.
  • Gkorgkas O, Vlachou A, Doulkeridis C, Nørvåg K, “Maximizing Influence of Spatio-Textual Objects Based on Keyword Selection”, 14th Hellenic Data Management Symposium (HDMS’16), Athens, Greece, July 28-29, 2016.
  • Doulkeridis C, Vlachou A, Nikitopoulos P, Tampakis P, Saouk M, “The RoadRunner Framework for Efficient and Scalable Processing of Big Data”, Proceedings of 19th Panhellenic Conference on Informatics (PCI’15), pp.215-220, Athens, Greece, October 1-3, 2015.
  • Gkorgkas O, Vlachou A, Doulkeridis C, Nørvåg K, “Maximizing Influence of Spatio-Textual Objects Based on Keyword Selection”, Proceedings of 14th International Symposium on Spatial and Temporal Databases (SSTD’15), Seoul, South Korea, August 26-28, 2015.
  • Gkorgkas O, Vlachou A, Doulkeridis C, Nørvåg K, “Finding the Most Diverse Products using Preference Queries”, 13th Hellenic Data Management Symposium (HDMS’15), Athens, Greece, July 20-21, 2015.
  • Karanasou M, Doulkeridis C, Halkidi M, “DsUniPi: An SVM-based approach for Sentiment Analysis of Figurative Language on Twitter”, Proceedings of 9th International Workshop on Semantic Evaluation (SemEval 2015), Denver, Colorado, June 4-5, 2015.
  • Gkorgkas O, Vlachou A, Doulkeridis C, Nørvåg K, “Finding the Most Diverse Products using Preference Queries”, Proceedings of 18th International Conference on Extending Database Technology (EDBT’15), Brussels, Belgium, March 23-27, 2015.