Publications By Subject

1. Spatial and Spatio-temporal Data Management
   1. Trajectory Modeling
   2. Trajectory Indexing, Query Processing
   3. Location-based Services
   4. Spatial Databases
2. Spatial (and other) Data Warehousing and Mining
   1. Trajectory DW&M
   2. Seismological DW&M
   3. Fuzzy Mining
   4. Other mining
3. Pattern Representation, Management and Monitoring
   1. Pattern-base Management Systems
   2. Cluster Monitoring

Publications By Genre

Articles in Int'l Journals:

[TKDE(2009) - Uncertainty Effect], [IJDWM(2008) - Seismo-Surfer], [IJBIDM(2008) - Traffic Mining]

[GEIN(2007) - NN search]

[DKE(2006) - CMDJ], [DKE(2006) - DBS]

[IJDWM(2005) - fuzzyminer]

[KER(2004) - stmodels], [GEIN(2004) - MWDJQ], [DKE(2004) - kCPQ], [SIGREC(2004) - PPDM]

[TCJ(2003) - LBS]

Chapters in Books:

[Spatio-temporal Trajectories] | [TDW] | [TD Models] | [TD Systems TD] | [WNDS] | [Movement data] | [PBMS] | [Spatial Joins] | [Seismo-Surfer]

Papers in Conference Proceedings:

[MDM'10 (TDW)], [ICDE'10 (TDW)], [ICDM'09 (TR-I-FCM)] [VLDB'09 (TDW)], [SSTD'09 (Compression Effect)], [HGIS'08 (TDW)], [ECML/PKDD'08 (PBMS)], [SIGKDD'08 (PBMS)], [EEEE'08 (Poll-Miner)], [PCI'08 (Existential Models)], [HDMS'08 (TDW)], [MobiDE'08 (TDW)], [TEMU'08 (DIACHORON)], [SIGMOD'08 (Hermes)]

[W2GIS'07 (Next Generation LBS)], [PHGC'07 (Next Generation LBS)], [TIME'07 (Similarity Search)], [INTUITION'07 (Hermes - VA control)], [STDM'07 (TD Mining)], [GRAPP'07 (Spatial Vagueness)], [ADBIS'07 (Compression Effect)], [ICDE'07 (MST Search)], [EURO XXII '07 ], [PCI'07 (PCI07)]

[ITAB'06 (ITAB06)], [BPI'06 (Retail-Miner)], [MobiDE'06 (Hermes)], [HDMS'06 (MONIC)], [KDD'06 (MONCI)], [EDBT'06 (Hermes)]

[W2GIS'05 (LBS)], [PCI'05 (Pattern Management), (Temporal Mining)], [SSTD'05 (NN search)]

[HGA'04 (Seismo-Surfer)], [GSG'04 (Seismo-Surfer)], [WPES'04 (AR blocking)], [PKDD'04 (patterns)], [PaRMa'04 (patterns)], [PaRMa'04 (FuzzyMiner)], [SSTD03 (FNRtree)]

[ADBIS'03 (MWDJQ)], [CIKM'02 (DBS)]

Technical Reports:

[TR-2009-01(Trajectory Clustering under uncertainty)], [TR-2008-01(Existential Cost Models)], [TR-2007-03(MONIC+)], [TR-2007-02(DM Patterns)], [TR-2007-01(Pattern Management)]

[TR-2006-01(MST search)]

[TR-2010-01 (HERMES)] [TR-2005-02(NN search)],

Editorships, Monographs, Theses:

[SSTD 2003 Proceedings], [Advanced Database Indexing]

1. Spatial and Spatio-temporal Data Management

1.1 Trajectory Modeling

• 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, 2007.
• 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, 2007.
• N. Pelekis, E. Frentzos, N. Giatrakos, Y. Theodoridis. An Oracle Data Cartridge for Moving Objects. UNIPI-INFOLAB-TR-2010-01, Technical Report Series, Information Systems Lab., University of Piraeus, Piraeus, Hellas, July 2010.
• N. Pelekis, B. Theodoulidis, I. Kopanakis, Y. Theodoridis. Literature Review of Spatio-Temporal Database Models. Knowledge Engineering Review, 19(3), 235-274, 2004.

1.2 Trajectory Indexing, Query Processing

• G. Kellaris, N. Pelekis and Y. Theodoridis. Trajectory Compression under Network Constraints. Proc. 11th International Symposium on Spatial and Temporal Databases (SSTD'09), Aalborg, Denmark, 2009.
• E. Frentzos, Y. Theodoridis and A. Papadopoulos. “Spatio-temporal trajectories”, in Ling Liu and M. Tamer Özsu (eds), Encyclopedia of Database Systems, Springer, 2008 (to appear).
• E. Frentzos and Y. Theodoridis. On the effect of Trajectory Compression in Spatiotemporal Querying. Proc. 11 East-European Conference on Advances in Databases and Information Systems ADBIS 2007 (ADBIS'07), Varna, Bulgaria.
• N. Pelekis, S. Vosinakis, T. Panayiotopoulos and Y. Theodoridis. Towards a Virtual Agent Control Architecture Using a Spatiotemporal Data Management Framework. Proc. of the 4th International INTUITION Conference (INTUITION'07), pp. 153-162, Athens, 2007.
• 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, 2007.
• 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, 2007.
• E. Frentzos, K. Gratsias, N. Pelekis, Y. Theodoridis. Algorithms for Nearest Neighbor Search on Moving Object Trajectories. GeoInformatica, 11:159–193, 2007.
• N. Pelekis, I. Kopanakis, I. Ntoutsi, G. Marketos, G. Andrienko and Y. Theodoridis. Similarity Search in Trajectory Databases. Proc. of the 14th IEEE International Symposium on Temporal Representation and Reasoning (TIME'07), Alicante, Spain, 2007.
• E. Frentzos, K. Gratsias, Y. Theodoridis. Index-based Most Similar Trajectory Search. Proc. 23rd International Conference on Data Engineering (ICDE'07), Istanbul, Turkey, April 2007.
• E. Frentzos, K. Gratsias, Y. Theodoridis. Index-based Most Similar Trajectory Search. UNIPI-ISL-TR-2006-01, Technical Report Series, Information Systems Lab., University of Piraeus, Piraeus, Hellas, November 2006.
• E. Frentzos, K. Gratsias, N. Pelekis, Y. Theodoridis. Nearest Neighbor Search on Moving Object Trajectories. Proc. 9th International Symposium on Spatial and Temporal Databases (SSTD'05), Angra dos Reis, Brazil, August 2005.
• E. Frentzos, K. Gratsias, N. Pelekis, Y. Theodoridis. Nearest Neighbor Search on Moving Object Trajectories. UNIPI-ISL-TR-2005-02, Technical Report Series, Information Systems Lab., University of Piraeus, Piraeus, Hellas, April 2005.
• E. Frentzos. Indexing Objects Moving on Fixed Networks. Proc. 8th International Symposium on Spatial and Temporal Databases (SSTD'03), Dresden, Germany, September 2003.

1.3 Location-based Services

• N. Pelekis, E. Frentzos, N. Giatrakos, Y. Theodoridis: "HERMES: Aggregative LBS via a Trajectory DB Engine". SIGMOD Conference (SIGMOD'08), Vancouver, Canada, 2008
• E. Frentzos, K. Gratsias and Y. Theodoridis. Implementing the Next Generation of Location Based Services, Proc. 8th Pan-Hellenic Geographical Conference, Working group on Geographic Data in the World Wide Web, Athens, Greece, October 2007.
• E. Frentzos, K. Gratsias and Y. Theodoridis. Towards the Next Generation of Location-based Services, Proc. 7th International Workshop on Web and Wireless Geographical Information Systems (W2GIS'07) 2007, Wales, UK, November 2007.
• N. Pelekis, Y. Theodoridis. Boosting Location-Based Services with a Moving Object Database Engine. Proc. 5th International ACM SIGMOD Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'06), Chicago, USA, June 2006.
• N. Pelekis, Y. Theodoridis, S. Vosinakhs and T. Panayiotopoulos. Hermes - A Framework for Location-Based Data Management. Proc. 10th International Conference on Extending Database Technology (EDBT'06), Munich, Germany, March 2006.
• K. Gratsias, E. Frentzos, V. Delis, Y. Theodoridis. Towards a Taxonomy of Location Based Services. Proc. 5th International Workshop on Web and Wireless Geographical Information Systems (W2GIS'05), Lausanne, Switzerland, December 2005
• Y. Theodoridis. Ten Benchmark Database Queries for Location-based Services. The Computer Journal, 46(6):713-725, October 2003.

1.4 Spatial Databases

• Ε. Frentzos, K. Gratsias and Y. Theodoridis. On the Effect of Location Uncertainty in Spatial Querying, IEEE Transactions on Knowledge and Data Engineering, 21(3), 2009.
• Ε. Frentzos, N. Pelekis and Y. Theodoridis. Cost Models and Efficient Query Processing over Existentially Uncertain Spatial Data, 12th Panhellenic Conference on Informatics (PCI'08), Samos, Greece.
• E. Frentzos, N. Pelekis, N. Giatrakos, Y. Theodoridis: "Identifying Unknown Border Lines from Historical Spatiotemporal Data: The DIACHORON Approach". International Conference on Telecommunications and Multimedia (TEMU'08), Ierapetra, Crete, 2008.
• Frentzos, E., Pelekis, N., and Theodoridis, Y. Cost Models and Efficient Query Processing over Existentially Uncertain Spatial Data, UNIPI-ISL-TR-2008-01, Technical Report Series, University of Piraeus, 2008.
• S. Vosinakis, N. Pelekis, Y. Theodoridis and T. Panayiotopoulos. Handling Spatial Vagueness in Virtual Agent Control. Proc. of the 2nd International Conference on Computer Graphics Theory and Applications (GRAPP'07), Barcelona, Spain, 2007.
• A. Corral, Y. Manolopoulos, Y. Theodoridis, M. Vassilakopoulos. Cost Models for Distance Joins Queries using R-trees. Data and Knowledge Engineering, 57(1):1-36, April 2006.
• A. Nanopoulos, Y. Theodoridis, Y. Manolopoulos. Indexed-based Density Biased Sampling for Clustering Applications. Data and Knowledge Engineering, 57(1):37-63, April 2006.
• N. Mamoulis, Y. Theodoridis, D. Papadias. Spatial Joins: Algorithms, Cost Models and Optimization. Chapter 7 in Y. Manolopoulos et al. (eds.) Spatial Databases - Technologies, Techniques and Trends, IDEA Group, 2005.
• A. Corral, Y. Manolopoulos, Y. Theodoridis, M. Vassilakopoulos. Multi-way Distance Join Queries in Spatial Databases. Geoinformatica, 8(4):373-402, December 2004.
• A. Corral, Y. Manolopoulos, Y. Theodoridis, M. Vassilakopoulos. Algorithms for Processing K-Closest Pair Queries in Spatial Databases. Data and Knowledge Engineering, 49(1), April 2004.
• A. Corral, Y. Manolopoulos, Y. Theodoridis, M. Vassilakopoulos. Distance Join Queries of Multiple Inputs in Spatial Databases. Proc. 7th East-European Conference on Advances in Databases and Information Systems (ADBIS'03), Dresden, Germany, September 2003.
• A. Nanopoulos, Y. Theodoridis, Y. Manolopoulos. An Efficient and Effective Algorithm for Density Biased Sampling. Proc. 11th Int'l Conference on Information and Knowledge Management (CIKM'02), McLean - VA, USA, November 2002.

2. Spatial (and other) Data Warehousing and Mining

2.1 Trajectory DW&M

• G. Marketos, Y. Theodoridis: "Ad-hoc OLAP on Trajectory Data". Proc. 11th International Conference on Mobile Data Management (MDM'10), Kansas City, Missouri, USA, May 2010.
• L. Leonardi, G. Marketos, E. Frentzos, N. Giatrakos, S. Orlando, N. Pelekis, A. Raffaeta, A. Roncato, C. Silvestri, Y. Theodoridis: "T-Warehouse: Visual OLAP Analysis on Trajectory Data", Proc. 26th International Conference on Data Engineering (ICDE'10), Los Angeles, USA, March 2010.
• N. Pelekis, I. Kopanakis, E. Kotsifakos, E. Frentzos and Y. Theodoridis: "Clustering Trajectories of Moving Objects in an Uncertain World", (ICDM'09), Maimi, USA, December 2009.
• G. Marketos, Y. Theodoridis: "Mobility Data Warehousing and Mining", Proc. 35th International Conference on Very Large Data Bases PhD Workshop (VLDB'09), Lyon, France, August 2009.
• N. Pelekis, I. Kopanakis, E. Kotsifakos, E. Frentzos and Y. Theodoridis: "Clustering and Representing Movements in an Uncertain World", UNIPI-ISL-TR-2009-01, Technical Report Series, U. Piraeus, 2009.
• S. Mantadakis, G. Marketos, Y. Theodoridis: "Analysis and Visualization of Moving Object Trajectories - The Trajectory Surfer Tool". Proc. 5th Panhellenic Conference HellasGIs (HGIS'08), Athens, Greece, December 2008.
• G. Marketos, E. Frentzos, N. Giatrakos, I Ntoutsi, N. Pelekis, A. Raffaeta, Y. Theodoridis: "A Framework for Trajectory Data Warehousing". Proc. 7th Hellenic Data Management Symposium (HDMS'08), Heraklion, Greece, July 2008.
• G. Marketos, E. Frentzos, I Ntoutsi, N. Pelekis, A. Raffaeta, Y. Theodoridis: "Building Real World Trajectory Warehouses". Proc. 7th International ACM SIGMOD Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'08), Vancouver, Canada, June 2008.
• I. Ntoutsi, N. Mitsou, G. Marketos "Traffic mining in a road-network: How does the traffic flow?", International Journal of Business Intelligence and Data Mining (IJBIDM), Special Issue on "KDD for Decision Making and Optimization", 2008.
• N. Pelekis, I. Kopanakis, I. Ntoutsi, G. Marketos and Y. Theodoridis. Mining Trajectory Databases via a Suite of Distance Operators. Proc. of the IEEE ICDE workshop on Spatio-Temporal Data Mining (STDM'07), Istanbul, Turkey, 2007.
• N. Pelekis, A. Raffaeta, M.L. Damiani, C. Vangenot, G. Marketos, E. Frentzos, I Ntoutsi, Y. Theodoridis. Towards Trajectory Data Warehouses. In F. Giannotti and D. Pedreschi (eds.) Mobility, Data Mining and Privacy, Geographic Knowledge Discovery, Springer, 2007.

2.2 Seismological DW&M

• G. Marketos, Y. Theodoridis, I. S. Kalogeras. Seismological Data Warehousing and Mining – A survey. International Journal of Data Warehousing and Mining, 4(1):1-16, January-March 2008.
• Y. Theodoridis. SEISMO-SURFER: A Prototype for Collecting, Querying, and Mining Seismic Data. In Y. Manolopoulos et al. (eds.) Advances in Informatics - Revised Selected Papers from the 8th Panhellenic Conference on Informatics, Springer-Verlag LNCS #2563, 2003.
• Y. Theodoridis, G. Marketos, I. S. Kalogeras. Collecting and Mining Seismic Data in Greek Territory - The Seismo-Surfer Tool. Proc. 7th Panhellenic Geographical Conference of the Hellenic Geographical Association (HGA'04), Mytilene, Lesvos, Greece, October 2004.
• I. S. Kalogeras, G. Marketos, Y. Theodoridis. A Tool for Collecting, Querying, and Mining Macroseismic Data. Proc. 10th International Congress of the Geological Society of Greece (GSG'04), Thessaloniki, Greece, April 2004. (Also, in Bulletin of the Geological Society of Greece, vol. XXXVI, 2004.)

2.3 Fuzzy Mining

• N.Pelekis, D.Iakovidis, E.E.Kotsifakos, H.Karanikas, I.Kopanakis. Intuitionistic Fuzzy Clustering to Information Retrieval from Cultural Databases.22nd European Conference on Operational Research (EURO XXII'07), Prague, 2007
• N. Pelekis, B. Theodoulidis, I. Kopanakis, Y. Theodoridis. Fuzzy Miner: Extracting Fuzzy Rules from Numerical Patterns. Int’l Journal of Data Warehousing and Mining, 1(1):57-81, January-March 2005.
• N. Pelekis, B. Theodoulidis, I. Kopanakis. Fuzzy Miner: A Fuzzy System for Solving Pattern Classification Problems. Proc. 1st International Workshop on Pattern Representation and Management (PaRMa'04), Heraklion, Crete, Greece, April 2004.
• N. Pelekis, D.K. Iakovidis, E.E. Kotsifakos, and I. Kopanakis. Fuzzy Clustering of Intuitionistic Fuzzy Data. International Journal of Business Intelligence and Data Mining, Inderscience. To appear.

2.4 Other mining

• E. Fanara, G. Marketos, N. Pelekis, Y. Theodoridis: "Analyzing Polls and News Headlines Using Business Intelligence Techniques". Proc. 20th National Conference of Hellenic Operational Research Society (EEEE'08), Spetses, Greece, June 2008.
• G. Marketos, E. Kotsifakos and Y. Theodoridis. Rethinking Decision Making: Measuring and Managing Performance. Proc. Pan-Hellenic Conference on New Technologies and Marketing (NTMarketing'07), Ierapetra, Crete, May 2007.
• G. Marketos, Y. Theodoridis. Measuring Performance in the Retail Industry. Proc. Workshop on Business Process Intelligence (BPI'06), Vienna, Austria, September 2006. Advances in Informatics - Springer-Verlag LNCS #4103, 2006.
• G. Marketos, K. Pediaditakis, Y. Theodoridis, and B. Theodoulidis.: Intelligent Stock Market Assistant using Temporal Data Mining. Proc. 10th Panhellenic Conference in Informatics (PCI'05), Volos, Greece, November 2005.
• V. S. Verykios, E. Bertino, I. N. Fovino, L. Parasility Provenza, Y. Saygin, Y. Theodoridis. State-of-the-art in Privacy Preserving Data Mining. ACM SIGMOD Record, 33(1), March 2004.
• E. D. Pontikakis, A. A. Tsitsonis, V. S. Verykios, Y. Theodoridis, L. Chang. A Quantitative and Qualitative Analysis of Blocking in Association Rule Hiding. Proc. 3rd Workshop on Privacy in the Electronic Society (WPES'04), Washington, DC, USA, December 2004.

3 Pattern Representation, Management and Monitoring

3.1 Pattern-base Management Systems

• E. E. Kotsifakos, I. Ntoutsi, Y. Vrahoritis, Y. Theodoridis. Monitoring Patterns through an Integrated Management and Mining Tool (Demo).Proc. of Machine Learning and Knowledge Discovery in Databases, European Conference (ECML/PKDD'08), Antwerp, Belgium, 2008.
• E. E. Kotsifakos, I. Ntoutsi, Y. Vrahoritis, Y. Theodoridis. PATTERN-MINER: Integrated Management and Mining over Data Mining Models (Demo).Proc. of 14th ACM SIGKDD Int. Conf. on Knowledge Discovery and Data Mining (KDD'08), Las Vegas, USA, 2008
• D.Iakovidis, E.E.Kotsifakos, N.Pelekis, H.Karanikas, I.Kopanakis and Y.Theodoridis. Pattern-Based Retrieval of Cultural Heritage Images.11th Panhellenic Conference on Informatics (PCI'07), Patras, Greece, 2007
• E. Kotsifakos, G. Marketos, Y. Theodoridis. A framework for integrating ontologies and pattern-bases. Chapter 12 in H.O. Nigro, S.G. Císaro and D. Xodo (eds.) Data Mining with Ontologies: Implementations, Findings, and Frameworks, IDEA Group, 2007.
• I. Ntoutsi, Y. Theodoridis. The notion of patterns in Data Mining. UNIPI-ISL-TR-2007-02, Technical Report Series, Information Systems Lab., University of Piraeus, Piraeus, Hellas, March 2007.
• I. Ntoutsi, Y. Theodoridis. Pattern Management. UNIPI-ISL-TR-2007-01, Technical Report Series, Information Systems Lab., University of Piraeus, Piraeus, Hellas, March 2007.
• D.K.Iakovidis, N.Pelekis, H.Karanikas, E.E.Kotsifakos, I.Kopanakis, Y.Theodoridis A Pattern Similarity Scheme for Medical Image Retrieval. Proc of the 7th Annual IEEE Conf on International Technology Applications in Biomedicine (ITAB'06), Ioannina, Greece
• E. Kotsifakos, I. Ntoutsi and Y. Theodoridis. Database Support for Data Mining Patterns. Proc. 10th Panhellenic Conference on Informatics (PCI'05), Volos, Greece, November 2005. Advances in Informatics - Springer-Verlag LNCS #3746, 2005. Springer LNCS
• I. Bartolini, P. Ciaccia, I. Ntoutsi, M. Patella, Y. Theodoridis. A Unified and Flexible Framework for Comparing Simple and Complex Patterns. Proc. 8th European Conference on Principles and Practice of Knowledge Discovery in Databases (PKDD'04), Pisa, Italy, September 2004.
• I. Ntoutsi. The Notion of Similarity in Data and Pattern Spaces. Proc. 1st International Workshop on Pattern Representation and Management (PaRMa'04), Heraklion, Crete, Greece, April 2004.

3.2 Cluster Monitoring

• M. Spiliopoulou, I. Ntoutsi, Y. Theodoridis. Tracing Cluster Transitions for Different Cluster Types. UNIPI-ISL-TR-2007-03, Technical Report Series, Information Systems Lab., University of Piraeus, Piraeus, Hellas, July 2007.
• M. Spiliopoulou, I. Ntoutsi, Y. Theodoridis and R. Schult The MONIC framework for Cluster Transition Detection, 5th Hellenic Data Management Symposium (HDMS'06), Thessaloniki, Greece, 2006.
• M. Spiliopoulou, I. Ntoutsi, Y. Theodoridis and R. Schult MONIC - Modeling and Monitoring Cluster Transitions, 12th ACM SIGKDD Int. Conf. on Knowledge Discovery and Data Mining (KDD'06), Philadelphia, USA, 2006.