Documentos: Recent submissions

  • A Collaborative Approach for Caching Dynamic Data in Portal Applications 
    Mahdavi Mehregan; Shepherd John; Benatallah Boualem (2004)
    Portals are one of the rapidly growing applications on the Web, providing a single interface to access different sources (providers). Providing fast response time is one of the critical issues in such applications. ...
  • Incorporating Business Requirements and Constraints in Database Conceptual Models 
    Khan Khaled M; Kapurubandara Mahesha; Chadha Urvashi (2003)
    Entity relationship (ER) approach is predominantly used for conceptual modelling of database systems in terms of entities and their relationships. The approach does not provide sufficient support for incorporating business ...
  • On the Road to Behavior-Based Integration 
    Stumptner Markus; Schrefl Michael; Grossmann Georg (2003)
    Integration of autonomous object-oriented systems requires the integration of object structure and object behaviour. Research in federated information systems has so far mainly addressed integration of object structure. ...
  • An Experimental Examination of Property Precedence in Conceptual Modelling 
    Parsons Jeffrey; Cole Linda; Hartmann; Roddick John (2003)
    Interest in evaluating conceptual modelling techniques has recently experienced a revival, in part due to widespread adoption of the Unified Modelling Language (UML). In addition, the use of ontology as a framework for ...
  • Putting Integrated Information in Context: Superimposing Conceptual Models with SPARCE 
    Murthy Sudarshan; Maier David; Delcambre Lois; Bowers Shawn (2003)
    A person working with diverse information sources—with possibly different formats and information models—may recognize and wish to express conceptual structures that are not explicitly present in those sources. Rather than ...
  • Enterprise Architecture Modelling Using Elastic Metaphors 
    Khoury Gerald R; Simoff Simeon J (2003)
    Despite the hype surrounding enterprise architectures, they have delivered little on their promise. In this paper, we argue that enterprise architectures built using component-based frameworks are fundamentally flawed, in ...
  • Automating XML documents Transformations: A conceptual modelling based approach 
    Boukottaya A; Vanoirbeek C; Paganelli F; Khaled O Abou; Aboukhaled@eif Omar; Ch (2003)
    The growing use of XML markup language has made a large amount of heterogeneous XML documents widely available. As the number of applications that utilize heterogeneous XML documents grows, the importance of XML documents ...
  • An Adaptive Information Retrieval System based on Associative Networks 
    Berger Helmut; Dittenbach Michael; Merkl Dieter (2003)
    In this paper we present a multilingual information retrieval system that provides access to Tourism information by exploiting the intuitiveness of natural language. In particular, we describe the knowledge representation ...
  • Context-Aware Web Information Systems 
    Binemann-Zdanowicz Aleksander; Kaschek Roland; Schewe Klaus-Dieter; Thalheim Bernhard (2003)
    Apart from completeness usability, performance and maintainability are the key quality aspects for Web information systems. Considering usability as key implies taking usage processes into account right from the beginning ...
  • Strategies for Processing ad hoc Queries on Large Data Warehouses * General Terms Algorithms, Performance 
    Stockinger Kurt; Geneva Cern; Switzerland Kurt; Stockinger@cern; Ch Kesheng; Wu; Shoshani Arie (2002)
    As data warehousing applications grow in size, existing data organizations and access strategies, such as relational tables and B-tree indexes, are becoming increasingly ineffective. The two primary reasons for this are ...
  • Constructing an OLAP Cube from Distributed XML Data 
    Niemi Tapio; Niinimäkiniinim¨niinimäki Marko; Nummenmaa Jyrki; Thanisch Peter (2002)
    On-Line Analytical Processing (OLAP) is a powerful method for analysing large data warehouse data. Typically, the data for an OLAP database is collected from a set of data repositories such as e.g. operational databases. ...
  • A Multidimensional and Multiversion Structure for OLAP Applications 
    Body Mathurin; Miquel Maryvonne; Bédard Yvan; Tchounikine Anne (2002)
    When changes occur on data organization, conventional multidimensional structures are not adapted because dimensions are supposed to be static. In many cases, especially when time covered by the data warehouse is large, ...
  • Performance Comparison of Property Map and Bitmap Indexing 
    Gupta Ashima; Davis Karen C; Grommon-Litton Jennifer (2002)
    A data warehouse is a collection of data from different sources that supports analytical querying. A Bitmap Index (BI) allows fast access to individual attribute values that are needed to answer a query by representing the ...
  • Query-based Data Warehousing Tool 
    Rifaieh Rami; Benharkat Nabila Aïcha (2002)
    Data warehousing is an essential element of decision support. It aims at enabling the knowledge user to make better and faster daily business decisions. In order to supply a decisional database, meta-data is needed to ...
  • Achieving Scalability in OLAP Materialized View Selection 
    Nadeau Thomas P; Teorey Toby J (2002)
    The goal of on-line analytical processing (OLAP) is to quickly answer queries from large amounts of data residing in a data warehouse. Materialized view selection is an optimization problem encountered in OLAP systems. ...
  • On Relationships Offering New Drill-across Possibilities 
    Abelí Alberto; Samos Joséjos´josé; Saltor F ` Elix (2002)
    OLAP tools divide concepts based on whether they are used as analysis dimensions, or are the fact subject of analysis , which gives rise to star shape schemas. Operations are always provided to navigate inside such star ...
  • Adding Subqueries to MySQL, or What Does it Take to Have a Decision-Support Engine? * 
    Badia Antonio; Chanda Matt; Cao Bin (2002)
    MySQL is an OLTP system without the ability to handle SQL subqueries. As part of our project in query optimization , we add subquery processing to MySQL through rewriting. First, we incorporate the ability to handle ...
  • Query Optimization For OLAP-XML Federations 
    Pedersen Dennis; Riis Karsten; Pedersen Torben Bach (2002)
    The changing data requirements of today's dynamic business environments are not handled well by current OLAP systems. Physically integrating unexpected data into such systems is a long and time-consuming process making ...
  • Goal-Oriented Requirement Analysis for Data Warehouse Design 
    Giorgini Paolo; Rizzi Stefano; Garzetti Maddalena (2005)
    Several surveys indicate that a significant percentage of data warehouses fail to meet business objectives or are outright failures. One of the reasons for this is that requirement analysis is typically overlooked in real ...
  • Parallel Querying of ROLAP Cubes in the Presence of Hierarchies 
    Dehne Frank; Eavis Todd; Rau-Chaplin Andrew (2005)
    Online Analytical Processing is a powerful framework for the analysis of organizational data. OLAP is often supported by a logical structure known as a data cube, a multidimen-sional data model that offers an intuitive ...

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