Data querying, models and languages

I am interested in flexible query processing, management and visualisation techniques for graph-structured data, with applications in education, healthcare, digital humanities and scientific data management. Longer-term interests have been in graph data models and languages and functional database languages.

Funded projects include:

ESPRESSO: Efficient Search over Personal Repositories - Secure and Sovereign. EPSRC EP/W025868/1 and EP/W024659/1, 2022-2025, in collaboration with Southampton University.
Flexible Querying and Integration of Linked Data.
Self e-Learning Networks (SeLeNe) .
Formalisation and Optimisation of Active Databases.
Graph-based models for visualisation and interaction with the WWW
Advanced Active Databases for Transport Engineering Research (Oct 93 - March 96). SERC/EPSRC grant with Dr Carol Small and the UCL Centre for Transport Studies.
Development of a Software Engineering Database System based on the Hypernode Model (Jan. 91 - March 93). SERC grant with Mark Levene at UCL.
Massive Databases for Highway and Transport Engineering Research (Sept 90 - March 93). SERC grant with Dr Carol Small and UCL Centre for Transport Studies.
SERC Postdoctoral Fellowship (UCL, Oct 89 - Sept 91) to investigate extending functional database languages with features from logic languages, object-oriented languages, and temporal data handling.
Extending a Functional Database Language to include features from Logic Programming (Birkbeck, Aug 89 - July 91), SERC grant with Prof Peter King.

Publications

See the DBLP Bibliography Server and Google Scholar.

Also:

Search in a Redecentralised Web, Thanassis Tiropanis, Alexandra Poulovassilis, Adriane Chapman, George Roussos. Proc. INWES 2021, pp. 07-14. DOI:10.5121/csit.2021.112102

Flexible Querying of Lifelong Learner Metadata, Alexandra Poulovassilis, Petra Selmer, Peter T. Wood. IEEE Transactions in Learning Technologies, 5(2), 117-129, 2012.

Performance Modelling of Event-Condition-Action Rules in P2P networks, G.Papamarkos, A.Poulovassilis and P.T.Wood. Journal of Computer and System Sciences, 77 (4), pp. 621–636, 2011.

Combining Approximation and Relaxation in Semantic Web Path Queries, A.Poulovassilis and P.T.Wood, Proc. 9th International Semantic Web Conference (ISCW 2010).

Finding Top-k Approximate Answers to Path Queries, C.A.Hurtado, A.Poulovassilis and P.T.Wood, Proc. 8th Int. Conf. on Flexible Query Answering Systems (FQAS'09).

Ranking Approximate Answers to Semantic Web Queries, C.A.Hurtado, A.Poulovassilis and P.T.Wood, Proc. 6th European Semantic Web Conference (ESCW'09), pp 263-277.

Query Relaxation in RDF, C.A.Hurtado, A.Poulovassilis and P.T.Wood, Journal of Data Semantics 10, pp 31-61, 2008.

A relaxed approach to RDF querying, C.A.Hurtado, A.Poulovassilis and P.T.Wood, Proc. 5th International Semantic Web Conference (ISCW'06), pp 314-328.

Event-Condition-Action Rule Languages on RDF metadata in P2P environments, G.Papamarkos, A.Poulovassilis and P.T.Wood. Technical Report BBKCS-05-05 . Final version is in Computer Networks 50(10), July 2006, pp 1513-1532.

Active Rules for Sensor Databases, M. Zoumboulakis, G. Roussos, A. Poulovassilis, Proc. Int'l Workshop on Data Management for Sensor Networks, at VLDB 2004.

Active Rules for Wireless Networks of Sensor & Actuators (Poster Absract), M. Zoumboulakis, G. Roussos, A. Poulovassilis, Proc. ACM SenSys 2004, Baltimore, Maryland.

RDFTL: An Event-Condition-Action Language for RDF, G.Papamarkos, A.Poulovassilis and P.T.Wood. Proc. 3rd Hellenic Data Management Symposium, June 2004.

RDFTL: An Event-Condition-Action Language for RDF, G.Papamarkos, A.Poulovassilis and P.T.Wood. Proc. 3rd Web Dynamics Workshop, at WWW'2004, May 2004.

Event-Condition-Action Rule Languages for the Semantic Web, G.Papamarkos, A.Poulovassilis and P.T.Wood. Proc. Workshop on Semantic Web and Databases, at VLDB'03, Berlin, September 2003.

Processing IQL Queries and Migrating Data in the AutoMed Toolkit, E. Jasper, A. Poulovassilis, L.Zamboulis. AutoMed Technical Report, July 2003.

An Event-Condition-Action Language for XML, J. Bailey, A. Poulovassilis, P.T. Wood. Proc. WWW2002, Hawaii, May 2002, pp 486-495.

Analysis and Optimisation of Event-Condition-Action Rules on XML, J. Bailey, A. Poulovassilis, P.T. Wood Computer Networks, 39(3), pp 239-259, 2002.

Optimising Active Database Rules by Partial Evaluation and Abstract Interpretation. J.Bailey, A.Poulovassilis and S.Courtenage. Proc. DBPL'01, Rome, September 2001. Springer-Verlag LNCS 2397, pp 300-317.

A Dynamic Approach to Termination Analysis for Active Database Rules. J.Bailey, A.Poulovassilis and P.Newson. Proc D00D'2000, London, July 2000. Springer-Verlag LNCS 1861, pp 1106-1120.

Analysis and Optimisation of Active Database Rules Using Abstract Interpretation and Partial Evaluation. J.Bailey and A.Poulovassilis, Tech. Rep. 27/09/99, Birkbeck College and King's College London.

An Abstract Interpretation Framework for Termination Analysis of Active Rules. J.Bailey and A.Poulovassilis. Proc DBPL'99, Kinloch-Rannoch, September 1999. Springer-Verlag LNCS 1949, pp 252-270.

Abstract Interpretation for Termination Analysis in Functional Active Databases. J.Bailey and A.Poulovassilis, Journal of Intelligent Information Systems, 12 (2/3), pp 243-273, 1999.

PFL: an active, functional DBPL (abstract). S.Reddi, A.Poulovassilis and C.Small. In "Active Rules in Database Systems", ed. Norman Paton, Springer-Verlag, 1999.

Formal foundations for optimising aggregation functions in Database Programming Languages. A.Poulovassilis and C.Small. Proc. DBPL'97, Denver, August 1997. Springer-Verlag LNCS 1369, pp 299-318.

A Formal Semantics for an Active Functional DBPL. A.Poulovassilis, S.Reddi and C.Small. Journal of Intelligent Information Systems, special issue on Active Databases, Vol. 7, No. 2, pp 151-172, October 1996.

Algebraic Query Optimisation for Database Programming Languages. A.Poulovassilis and C.Small. The VLDB Journal, Vol. 5, No. 2, pp 119-132, April, 1996.

Extending a functional DBPL with ECA-rules. S.Reddi, A.Poulovassilis and C.Small. Proc. 2nd International Workshop on Rules in Databases (RIDS), Athens, September 1995, pp 101-115.. Springer-Verlag LNCS 985.

Manipulation operations for an interval-extended relational model. N.Lorenzos, A.Poulovassilis and C.Small. Data and Knowledge Engineering, Vol 17, pp 1-29, 1995.

Combining Inheritance and Parametric Polymorphism in a Functional Database Language. S.Courtenage and A.Poulovassilis. Proc. 13th British National Conference on Databases (BNCOD), Manchester, July 1995, pp 24-46. Springer-Verlag LNCS 940.

Erratum Sheet for the above paper.

Investigation of Algebraic Query Optimisation for Database Programming Languages. A.Poulovassilis and C.Small. Proc. 20th International Conference on Very Large Data Bases (VLDB 94), Santiago, Chile, September 1994, pp 415-426.

Implementation of Update Operations for Interval Relations (abstract). N.Lorenzos, A.Poulovassilis and C.Small. The Computer Journal, Vol. 37, No 3, pp 164-176, 1994. O.U.P.

A Domain-Theoretic Approach to Integrating Functional and Logic Database Languages. A.Poulovassilis and C.Small. Proc. 19th International Conference on Very Large Data Bases (VLDB 93), Dublin, August 1993, pp 416-428. Morgan Kaufmann.

A Pattern-Matching Algorithm for Functional Databases. A.Poulovassilis. The Computer Journal, Vol. 36, No. 2, pp 195-199, 1993. O.U.P.

The Implementation of FDL, a Functional Database Language. A.Poulovassilis. The Computer Journal, Vol. 35, No. 2, pp 119-128, 1992. C.U.P.

A Functional Programming Approach to Deductive Databases. A.Poulovassilis and C.Small. Proc. 17th International Conference on Very Large Data Bases (VLDB 91), Barcelona, September 1991, pp 491-500.

An Overview of PFL. C.Small and A.Poulovassilis Proc. 3rd International Workshop on Database Programming Languages, Nafplion, August 1991, pp 96-110.

Extending the Functional Data Model to computational completeness. A.Poulovassilis and P.King. Proc. International Conference on Extending Database Technology (EDBT-90), Venice, March 1990, pp 75-91. Lecture Notes in Computer Science 416, Springer-Verlag.

FDL : an integration of the Functional Data Model and the Functional Computational Model. A.Poulovassilis. Proc. 6th British National Conference on Databases, Cardiff, July 1988, pp 215-236. C.U.P.