Dimitrios Theodoratos

Contact Info

Title: Associate Professor
Email: dimitri.theodoratos@njit.edu
Office: GITC 4207
Phone: 973-596-5213
Dept: Computer Science
Webpage: http://web.njit.edu/~dth

About Me



Education

Diploma

Electrical and Computer Engineering Department,
National Technical University of Athens (NTUA),
Athens, Greece.

Master

 Telecom Paris Tech:
Ecole Nationale Supérieure de Télécommunications de Paris (ENST),
Paris, France.

PhD

 Laboratoire de Recherche en Informatique (LRI), 

University of Paris XI,
Paris, France.

Awards

Teaching Awards

  • Excellence in Teaching Award in the category Excellence in Graduate Instruction by the Committee on Excellence in Teaching of NJIT. Summer 2005.

Research Awards

  • International IBM Faculty Award Summer 2004.

Website

http://web.njit.edu/~dth

Current Courses

Fall semester 2008:

 

CS 631: DATA MANAGEMENT SYSTEMS DESIGN
SECTION 101 - TUESDAYS 6.00 - 9.05 PM. 

 

CS 632: ADVANCED DATABASE SYSTEMS DESIGN
SECTION 101 - WEDNESDAYS 6.00 - 9.05 PM. 

PhD Qualifying Exam

Summer 2009

DATA MANAGEMENT SYSTEMS DESIGN (CS 631) 

 

Research Interests

  • Databases

  • Query Processing

  • XML

  • Data Warehousing

  • OLAP - Multidimensional Databases

  • Data Integration

  • Semantic Web

Projects

Current

Data Fusion
Event-Based Fusion of Distributed Multimedia Data Sources
NJIT - Funded by DoD, Research Army Lab.

Semantic Data Integration
Tree-Structured Data Source Integration on the Semantic Web.
NJIT - Project of collaboration between NJIT and NTUAthens funded by European Funds.

Materialized Views / Data Warehousing
Evaluation for Multiple Queries in the Presence of Space Restrictions.
NJIT - Project funded by IBM Center of Advanced Studies in Toronto.

Past

AutoMed
Automatic Generation of Mediator Tools for Heterogeneous Database Integration.
Birkbeck College, University of London - EPSRC funded project, UK

EDITH
European Development on Indexing Techniques for Databases with Multidimensional Hierarchies
NTUAthens - European 5th FWP IST Project

DQDSS
Data Quality in Decision Support Systems. 


NTUAthens - Funded by the Program of Bilateral Cooperation Platon 2000: Integrated action between France and Greece.

DWQ
Foundations of Data Warehouse Quality
NTUAthens - European 4th FWP ESPRIT Project

FIDE and FIDE2
Formally Integrated Data Environment
LRI, University of Paris XI - European 2nd and 3rd FWP ESPRIT Projects

Laboratories

Knowledge and Database Systems Laboratory, 
National Technical University of Athens (NTUA), 
Athens, Greece

Databases and Web Technologies Group, 
Birkbeck College, University of London, 
London, UK

Verso and Caravel Groups, 
Institut Nationale de Recherche en Informatique et Automatique (INRIA), 
Paris, France.

Business and Information Technology Department, 
Rutherford Appleton Laboratory (RAL), 
Oxfordshire, UK.

Laboratoire de Recherche en Informatique (LRI),  
University of Paris XI (UPS), 
Paris, France.

Recent Publications

 

Dimitri Theodoratos, Pawel Placek, Theodore Dalamagas, Stefanos Souldatos, Timos Sellis.
Containment of Partially Specified Tree-Pattern Queries in the Presence of Dimension Graphs.
International Journal on Very Large Databases (VLDBJ), Springer, accepted 2008.
 
Pawel Placek, Dimitri Theodoratos, Stefanos Souldatos, Theodore Dalamagas, Timos Sellis.
A Heuristic Approach for Checking Containment of Generalized Tree-Pattern Queries.
To appear in Proc. of the 17th ACM Intl. Conference on Information and Knowledge Management (CIKM´08), Napa Valley, CA, Oct. 2008, ACM Press.
 
Xiaoying Wu, Dimitri Theodoratos.
Evaluating Partial Tree-Pattern Queries on XML Streams
To appear in Proc. of the 17th ACM Intl. Conference on Information and Knowledge Management (CIKM´08), Napa Valley, CA, Oct. 2008, Poster paper, ACM Press.
 
Xiaoying Wu, Stefanos Souldatos, Dimitri Theodoratos, Theodore Dalamagas, Timos Sellis.
Efficient Evaluation of Generalized Path Pattern Queries on XML Data.
Proc. of the 17th Intl. World Wide Web Conference (WWW´08), Beijing, China, Apr. 2008, ACM Press, pages 835-844.
 
Dimitri Theodoratos, Xiaoying Wu.
Assigning Semantics to Partial Tree-Pattern Queries.
Data and Knowledge Engineering  (DKE) Journal, Elsevier, Vol. 64, Issue 1, Elsevier Science, Jan. 2008, pp. 242 - 265.
 
Stefanos Souldatos, Xiaoying Wu, Dimitri Theodoratos, Theodore Dalamagas, Timos Sellis

 

Evaluation of Partial Path Queries on XML data.

 

 

 

 

 

 

 

 

Proc. of the 16th ACM Intl. Conference on Information and Knowledge Management (CIKM´07), Lisbon, Portugal, Nov. 2007, ACM Press, pages 21-30.

 

 
 
Wugang Xu, Dimitri Theodoratos, Calisto Zuzarte, Xiaoying Wu, Vincent Oria.
A Dynamic View Materialization Scheme for Sequences of Query and Update Statements.
Proc. of the 9th Intl. Conference on Data Warehousing and Knowledge Discovery (DaWaK´07), Regensburg, Germany, Sep. 2007, Springer, LNCS 4654, pages 55 - 65.
 
Dimitri Theodoratos, Xiaoying Wu.
An Original Semantics to Keyword Queries for XML Using Structural Patterns.
Proc. of the 12th Intl. Conference on Database Systems for Advanced Applications (DASFAA´07), Bangkok, Thailand, April 2007, Springer, LNCS, pages 727 - 739.
 
Dimitri Theodoratos, Xiaoying Wu.
Integration of XML Data Sources with Structural Differences
Proc. of the Intl. Workshop on Scalable Web Information Integration and Service (SWIIS´07), Bangkok, Thailand, April 2007, World Scientific Press, pages 10.
Dimitri Theodoratos, Stefanos Souldatos, Theodore Dalamagas, Pawel Placek, Timos Sellis.
Heuristic Containment Check of Partial Tree-Pattern Queries in the Presence of Index Graphs.
Proc. of the 15th ACM Intl. Conference on Information and Knowledge Management (CIKM´06), Arlington, VA, Nov. 2006, ACM Press, pages 445 - 454.
Wugang Xu, Dimitri Theodoratos, Calisto Zuzarte.
Computing Closest Common Subexpressions for View Selection Problems.
Proc. of the 9th ACM Intl. Workshop on Data Warehousing and On-Line Analytical Processing (DOLAP´06), Arlington, VA, U.S.A., Nov. 2006, ACM Press, pages 75 - 82.
Dimitri Theodoratos, Theodore Dalamagas, Pawel Placek, Stefanos Souldatos, Timos Sellis.
Containment of Partially Specified Tree-Pattern Queries
Proc. of the 18th Intl. Conference on Scientific and Statistical Databases (SSDBM´06), Vienna, Austria, July 2006, IEEE Computer IEEE Computer Society Press, pages 3-12.
Wugang Xu, Calisto Zuzarte, Dimitri Theodoratos, Wenbin Ma.
Preprocessing for Fast Refreshing Materialized Views in DB2.
Proc. of the 8th Intl. Conference on Data Warehousing and Knowledge Discovery (DaWaK´06), Krakow, Poland, Sep. 2006, Springer, LNCS pages 55 - 64.
Dimitri Theodoratos, Theodore Dalamagas, Antonis Koufopoulos, Narain Gehani.
Semantic Querying Tree-Structured Data Using Partially Specified Tree-Patterns.
Proc. of the 14th ACM Intl. Conference on Information and Knowledge Management (CIKM´05), Bremen, Germany, Oct.-Nov. 2005, ACM Press, pages 712-719.
Dimitri Theodoratos, Theodore Dalamagas, I-Ting Liu.
Semantic Integration of Schema Conforming XML Data Sources
Proc. of the 6th Intl. Conference on Web Information Systems Engineering (WISE´05), New York City, NY, USA, Nov. 2005, Springer-Verlag, LNCS  pages 558-559.
Theodore Dalamagas, Dimitri Theodoratos, Antonis Koufopoulos, I-Ting Liu.
Semantic Integration on Tree-Structured Data Using Dimension Graphs.
Journal on Data Semantics (JoDS), Springer-Verlag, pages 250-279.
Theodore Dalamagas, Dimitri Theodoratos, Antonis Koufopoulos, Vincent Oria.
Evaluation of Queries on Tree-Structured Data Using Dimension Graphs.
Proc. of the 9th Intl. Database Engineering and Applications Symposium (IDEAS´05), Montreal, Canada, July 2005, IEEE Computer Society Press, pages 65 - 74.
Dimitri Theodoratos, Theodore Dalamagas.                 
Querying Tree-Structured Data Using Dimension Graphs.
Proc. of the 17th Intl. Conference on Advanced Information Systems Engineering (CAiSE´05), Porto, Portugal, June 2005, Springer-Verlag, LNCS, Vol. 3520, pages 201-215.
Dimitri Theodoratos, Alkis Simitsis.
Materialized View Selection for Data Warehouse Design
Ecyclopedia of Data Warehousing and Mining, Idea Group Publishing, April 2005.
Alkis Simitsis, Dimitri Theodoratos.
Data Warehouse Back-End Tools
Ecyclopedia of Data Warehousing and Mining, Idea Group Publishing, April 2005.
Dimitri Theodoratos, Wugang Xu.
Constructing Search Spaces for Materialized View Selection
Proc. of the 7th ACM Intl. Workshop on Data Warehousing and On-Line Analytical Processing (DOLAP´04), Washington, D.C., U.S.A., Nov. 2004, ACM Press.
Dimitri Theodoratos, Theodore Dalamagas.
Querying and Integrating Ontologies viewed as Conceptual Schemas.
Proc. of the 22nd Intl. Conf. on Conceptual Modeling (ER´03), Chicago, USA, Oct. 2003, Springer-Verlag, LNCS 2813, pages 548 - 561.
Dimitri Theodoratos.
Exploiting Hierarchical Clustering in Evaluating Multidimensional Aggregation Queries
Proc. of the 6th ACM Intl. Workshop on Data Warehousing and On-Line Analytical Processing (DOLAP´03), New Orleans, U.S.A., Nov. 2003, ACM Press.
Dimitri Theodoratos, Aris Tsois
Processing OLAP Queries in Hierarchically Clustered Databases.
Data and Knowledge Engineering Journal (DKE), 2003, Vol. 39, Issue 3, Elsevier Science, pp. 205 - 224.
Dimitri Theodoratos
Semantic Integration and Querying of Heterogeneous Data Sources Using a Hypergraph Data Model.
Proc. of the 19th British National Conference on Databases (BNCOD´02), Sheffield, UK, 2002, July 2002, Springer-Verlag, LNCS  2405, pp. 166 - 182.
Aris Tsois, Nilkos Karayannidis, Timos Sellis, and Dimitri Theodoratos
Cost-based optimization of aggregation star queries on hierarchically clustered data warehouses.
Proc. of the 4th Intl. Workshop on Design and Management of Data Warehouses (DMDW´02), June 2002, Toronto, Canada.
Dimitri Theodoratos, Spyros Ligoudistianos, Timos Sellis.
View Selection for Designing the Global Data Warehouse
Data and Knowledge Engineering Journal (DKE), Vol. 39, Issue 3, Special Issue on Warehouse Design for Structured and Semistructured Data, Nov. 2001, Elsevier Science, pp. 219 - 240
Dimitri Theodoratos, Theodore Dalamagas, Alkis Simitsis, Manos Stavropoulos.
A Randomized Approach for the Incremental Design of an Evolving Data Warehouse.
Proc. of the 20th Intl. Conf. on Conceptual Modeling (ER´01), Yokohama, Japan, Nov. 2001, Springer-Verlag, LNCS.
Dimitri Theodoratos, Aris Tsois.
Heuristic Optimization of OLAP Queries in Multidimensionally Hierarchically Clustered Databases
Proc. of the 4rd ACM Intl. Workshop on Data Warehousing and On-Line Analytical Processing (DOLAP´01), Atlanta, U.S.A., Nov. 2001, ACM Press.
Panos Vassiliadis, Spyros Ligoudistianos, Timos Sellis, Dimitri Theodoratos.
Quality-Oriented Optimization of the Design of the Global Data Warehouse
Proc. of the 8th Panhellenic Conference on Informatics (PCI´01), Nicosia, Cyprus, Nov. 2001.
Dimitri Theodoratos, Mokrane Bouzeghoub.
Data Currency Quality Satisfaction in the Design of a Data Warehouse
International Journal of Cooperative Information Systems (IJCIS),Vol. 10, Issue 3, Special Issue on Data Warehouses, 2001, World Scientific, pp. 299 - 326.
Dimitri Theodoratos.
Detecting Redundant Materialized Views in Data Warehouse Evolution
Journal of Information Systems (IS), Special Issue on Data Warehousing, Vol. 26, Issue 5, 2001, Pergamon, pp. 363 - 381. 
Dimitri Theodoratos, Mokrane Bouzeghoub
A General Framework for the View Selection Problem for Data Warehouse Design and Evolution
Proc. of the 3rd ACM Intl. Workshop on Data Warehousing and On-Line Analytical Processing (DOLAP´00), Washington, DC., U.S.A., Nov. 2000, ACM Press, pp. 1 -8.
Dimitri Theodoratos
Complex View Selection for Data Warehouse Self-Maintainability
Proc. of the 5th IFCIS Intl. Conf. on Cooperative Information Systems (CooPIS´00), Eilat, Israel, Sep. 2000, Springer-Verlag, LNCS No 1901, pp .78-89.
Dimitri Theodoratos, Timos Sellis
Answering Queries on Cubes Using Other Cubes
Proc. of the 12thIntl. Conf. on Scientific and Statistical Database Management (SSDBM´00), Berlin, Germany, July 2000, IEEE Computer Society Press, pp. 109 -122.
Dimitri Theodoratos, Timos Sellis
Incremental Design of a Data Warehouse
Journal of Intelligent Information Systems (JIIS), Special Issue on Data Warehousing and Knowledge Discovery, Vol. 15, Issue 1, 2000, Kluwer Academic Publishers, pp. 7 - 27.
Dimitri Theodoratos
Detecting Redundancy in Data Warehouse Evolution
Proc. of the 18th Intl. Conf. on Conceptual Modeling (ER´99), Paris, France, Nov. 1999, Springer-Verlag, LNCS No 1728, pp. 340 - 353.
Dimitri Theodoratos, Timos Sellis
Designing Data Warehouses
Data and Knowledge Engineering Journal (DKE), Elsevier Science, Vol. 31, Issue 3, Oct. 1999, pp. 279 - 301.
Spyros Ligoudistianos, Timos Sellis, Dimitri Theodoratos, Yannis Vassiliou
Heuristic Algorithms for Designing the Global Data Warehouse with SPJ Views
Proc. of the 1st Intl. Conf. on Data Warehousing and Knowledge Discovery, (DaWaK´99), Florence, Italy, Aug. 30 - Sep. 1, 1999, Springer - Verlag, LNCS No 1676, pp. 66 - 105.
Dimitri Theodoratos, Timos Sellis
Dynamic Data Warehouse Design
Proc. of the 1st Intl. Conf. on Data Warehousing and Knowledge Discovery, (DaWaK´99), Florence, Italy, Aug. 30 - Sep. 1, 1999, Springer - Verlag, LNCS No 1676, pp. 1 - 10.
Dimitri Theodoratos, Spyros Ligoudistianos, Timos Sellis
Designing the Global Data Warehouse with SPJ queries
Proc. of the 11th Intl. Conf. on Advanced Information Systems Engineering (CAiSE´99), Heidelberg, Germany, June 1999, Springer - Verlag, LNCS No 1626, pp. 180 - 194.
Dimitri Theodoratos, Mokrane Bouzeghoub
Data Currency Quality Factors in Data Warehouse Design
Proc. of the 1st Intl. Workshop on Design and Management of Data Warehouses (DMDW´99), June 1999, Heidelberg, Germany, Swiss Life Information Systems Research, pp. 15 / 1-16.
Dimitri Theodoratos, Timos Sellis
Data Warehouse Scheme and Instance Design
Proc. of the 17th Intl. Conf. on Conceptual Modeling (ER´98), Singapore, Singapore, Nov. 1998, Springer-Verlag, LNCS No 1507, pp. 363 -376.
Spyros Ligoudistianos, Dimitri Theodoratos, Timos Sellis
Experimental Evaluation of Data Warehouse Configuration Algorithms
Proc. of the 10th Intl. Workshop on Database and Expert systems Applications (DEXA Workshop´98), Vienna, Austria, Aug. 1998, IEEE Computer Society Press, pp. 218 - 223.
Dimitri Theodoratos
Logical Updating of Object Class Structures
Proc. of the 5th Intl. Conf. on Deductive and Object Oriented Databases (DOOD´97), Montreux, Switzerland, Dec. 1997, Springer-Verlag, LNCS No 1341, pp. 158 - 174.
Dimitri Theodoratos, Timos Sellis
Data Warehouse Configuration
Proc. of the 23rd. Intl. Conf. on Very Large Databases (VLDB´97), Athens, Greece, Aug. 1997, Morgan Kaufmann, pp. 126 - 135.
Dimitri Theodoratos
Deductive Object Oriented Schemas
Proc. of the 13th. Intl. Conf. on Conceptual Modeling (ER´96), Cottbus, Germany, Oct. 1996, Springer-Verlag, LNCS No 1157, pp. 58 - 72.