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Searching for authors named "Spiros Skiadopoulos" – sorted by Relevance.

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  • On the consistency of cardinal directions constraints  
  • by Spiros Skiadopoulos, Manolis Koubarakis — 2005 — Artificial Intelligence
  • …We present a formal model for qualitative spatial reasoning with cardinal directions utilizing a co-ordinate system. Then, we study the problem of checking the consistency of a set of cardinal direction constraints. We introduce the first algorithm for this problem, prove its correctness and analyze…
  • Cited by 3 (0 self) – Add To MetaCart
  • Querying Temporal Constraint Networks in PTIME  
  • by Manolis Koubarakis, Spiros Skiadopoulos — 1999 — In Proceedings of AAAI-99
  • …We start with the assumption that temporal knowledge usually captured by constraint networks can be represented and queried more effectively by using the scheme of indefinite constraint databases proposed by Koubarakis. Although query evaluation in this scheme is in general a hard computational prob…
  • Cited by 2 (2 self) – Add To MetaCart
  • Modelling and optimisation issues for multidimensional databases  
  • by Panos Vassiliadis, Spiros Skiadopoulos — 2000 — In Proc. of CAiSE-2000
  • …On-Line Analytical Processing (OLAP) is a trend in database technology based on the multidimensional view of data. Although multidimensional data cubes form the basic logical data model for OLAP applications, there seems to be no agreement on a common model for cubes. In this paper we propose, a log…
  • Cited by 5 (2 self) – Add To MetaCart
  • On the Logical Modeling of ETL Processes  
  • by Panos Vassiliadis, Alkis Simitsis, Spiros Skiadopoulos — 2002 — In International Conference on Advanced Information Systems Engineering (CAiSE
  • …Extraction-Transformation-Loading (ETL) tools are pieces of software responsible for the extraction of data from several sources, their cleansing, customization and insertion into a data warehouse. Research has only recently dealt with the above problem and provided few models, tools and techniques …
  • Cited by 5 (2 self) – Add To MetaCart
  • Modeling ETL activities as graphs  
  • by Panos Vassiliadis, Alkis Simitsis, Spiros Skiadopoulos — 2002 — In Proc. 4 th Intl. Workshop on Design and Management of Data Warehouses (DMDW
  • …Abstract. Extraction-Transformation-Loading (ETL) tools are pieces of software responsible for the extraction of data from several sources, their cleansing, customization and insertion into a data warehouse. In this paper, we focus on the logical design of the ETL scenario of a data warehouse. Based…
  • Cited by 14 (10 self) – Add To MetaCart
  • S.: Graph-Based Modeling of ETL Activities with Multi-level Transformations and Updates  
  • by Alkis Simitsis, Panos Vassiliadis, Manolis Terrovitis, Spiros Skiadopoulos — 2005 — In Proceedings of the DaWaK’05 International Conference
  • …Abstract. Extract-Transform-Load (ETL) workflows are data centric workflows responsible for transferring, cleaning, and loading data from their respective sources to the warehouse. Previous research has identified graphbased techniques, in order to construct the blueprints for the structure of such …
  • Cited by 2 (1 self) – Add To MetaCart
  • Conceptual Modeling for ETL Processes  
  • by Panos Vassiliadis, Alkis Simitsis, Spiros Skiadopoulos — 2002
  • …software responsible for the extraction of data from several sources, their cleansing, customization and insertion into a data warehouse. In this paper, we focus on the problem of the definition of ETL activities and provide formal foundations for their conceptual representation. The proposed concep…
  • Cited by 19 (8 self) – Add To MetaCart
  • Blueprints for ETL workflows  
  • by Panos Vassiliadis, Alkis Simitsis, Manolis Terrovitis, Spiros Skiadopoulos, Ioannina Hellas — 2005 — In Proc. 24th International Conference on Conceptual Modeling (ER 2005
  • …Abstract. Extract-Transform-Load (ETL) workflows are data centric workflows responsible for transferring, cleaning, and loading data from their respective sources to the warehouse. Previous research has identified graphbased techniques that construct the blueprints for the structure of such workflow…
  • Cited by 1 (1 self) – Add To MetaCart
  • Arktos: A Tool for Data Cleaning and Transformation in Data Warehouse Environments  
  • by Panos Vassiliadis, Zografoula Vagena, Spiros Skiadopoulos, Nikos Karayannidis, Timos Sellis — 2000 — IEEE Data Eng. Bull
  • …Extraction-Transformation-Loading (ETL) and Data Cleaning tools are pieces of software responsible for the extraction of data from several sources, their cleaning, customization and insertion into a data warehouse. To deal with the complexity and efficiency of the transformation and cleaning tasks w…
  • Cited by 6 (0 self) – Add To MetaCart
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