Computer Science

Computer Science Colloquium

Hui Ma
Victoria University of Wellington, New Zealand

A Geometrically Enhanced Conceptual Model and Query Language

Wed 14.12.2011, 15:30, 60 minutes
K 224B


Motivated by our experiences with spatial modelling for the sustainable land use initiative we present a geometrically enhanced ER model (GERM), which preserves the key principles of entity-relationship modelling and at the same time introduces bulk constructors and geometric features. The model distinguishes between a syntactic level of types and an explicit internal level, in which types give rise to polyhedra that are defined by algebraic varieties. Together with GERM we present a query language (GERM_SQL) on the conceptual level with means for describing and composing geometric data that are compatible with the dual representation of geometric data on the surface and the internal level. Further, it emphasises the stability of algebraic operations by means of a natural modelling algebra that extends the usual Boolean operations on point sets.


Hui Ma is a Senior Lecturer at the School of Engineering and Computer Science at Victoria University of Wellington in New Zealand. She received a Bachelor in Civil Engineering from Tongji University in P. R. China, a Master of Information Sciences (with First Class Honours), and a Ph. D in Information Systems from Massey University in New Zealand. She was an Assistant Lecturer at the Department of Information Systems at Massey University and an Environmental Information Analyst at Horizons Regional Council before she joined Victoria University of Wellington in 2008. She was also a member of the Information Science Research Centre at Massey University from 2003 to 2007 and a member of Elvis Software Engineering research group at School of Engineering and Computer Science at Victoria University of Wellington since 2008. Her major research interests are distributed databases, conceptual modelling, service-oriented systems, and geographical information systems.
Invited by Hon.-Prof. Dr. Klaus-Dieter Schewe (FAW)

The Computer Science Colloquium is organized by the Department of Coputer Science at JKU, the Österreichische Gesellschaft für Informatik (ÖGI) and the Österreichische Computergesellschaft (OCG).
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