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Query processing on cubes mapped from ontologies to dimension hierarchies

Carlos Garcia-Alvarado, Carlos Ordonez
2012 Proceedings of the fifteenth international workshop on Data warehousing and OLAP - DOLAP '12  
,A e ) • An ontology O is mapped to a dimension hierarchy as a tree-like structure. • A query Q is a subset of dimensions from F which builds an OLAP cube. 5 posed, where summarization and hierarchies  ...  Even though this paper deals with ontologies, the entire notation is focused on the OLAP common notation for mapping ontologies to dimension hierarchies.  ... 
doi:10.1145/2390045.2390055 dblp:conf/dolap/Garcia-AlvaradoO12 fatcat:ljkf5eiyjzbvlloru2nhg5ewsm

SETLBI: An Integrated Platform for Semantic Business Intelligence

Rudra Pratap Deb Nath, Katja Hose, Torben Bach Pedersen, Oscar Romero, Amrit Bhattacharjee
2020 Companion Proceedings of the Web Conference 2020  
, c) to generate the dimension hierarchies from instances of the fact tables and the TBox so that it enables MDX queries over the data warehouse.  ...  Users first extract the cube structure composed of dimensions, hierarchies, levels, measures and aggregate functions.  ... 
doi:10.1145/3366424.3383533 dblp:conf/www/NathHP0B20 fatcat:ej4k656t4jc6hiw5wvgag4c7fq

Interactive multidimensional modeling of linked data for exploratory OLAP

Enrico Gallinucci, Matteo Golfarelli, Stefano Rizzi, Alberto Abelló, Oscar Romero
2018 Information Systems  
hierarchies to enrich the RDF cube.  ...  While some techniques to create, publish, and query RDF cubes are already available, little has been said about how to contextualize these cubes with situational data in an on-demand fashion.  ...  mappings between the hierarchy levels and the cube dimensions.  ... 
doi:10.1016/ fatcat:ofvmsaxnkbajlnu4asmveefpeu

DC Proposal: Online Analytical Processing of Statistical Linked Data [chapter]

Benedikt Kämpgen
2011 Lecture Notes in Computer Science  
To automatically, flexibly, and scalable integrate statistical Linked Data for expressive and reliable analysis, we propose to use expressive Semantic Web ontologies to build and evolve a well-interlinked  ...  conceptual model of statistical data for Online Analytical Processing.  ...  At the moment, most Dimensions only have one Hierarchy and Level, represented by rdfs:label from the Dimension Value.  ... 
doi:10.1007/978-3-642-25093-4_22 fatcat:4ahg6n73erd3lauji7hd45n5pi

Multidimensional Integrated Ontologies: A Framework for Designing Semantic Data Warehouses [chapter]

Victoria Nebot, Rafael Berlanga, Juan Manuel Pérez, María José Aramburu, Torben Bach Pedersen
2009 Lecture Notes in Computer Science  
Nowadays, many applications attach metadata and semantic annotations taken from domain and application ontologies to the information they generate.  ...  From our point of view, the concepts in these ontologies could describe the facts, dimensions, categories and values implied in the analysis subjects of a data warehouse.  ...  From now on, an ontology symbol s that is transformed from the ontology O1 to O2 by using a mapping m, is denoted with s O1 m  O2 .  ... 
doi:10.1007/978-3-642-03098-7_1 fatcat:ilkhoynuojezff7vks6izvtx4i

A Formal OLAP Algebra for NoSQL based Data Warehouses

Shreya Banerjee, Sourabh Bhaskar, Anirban Sarkar, Narayan C. Debnath
2021 Annals of Emerging Technologies in Computing  
However, business analysts face challenges when performing On Line Analytical Processing (OLAP) queries on these NoSQL systems.  ...  In addition, deficiency of precise semantics in OLAP operations create obstacles to effective query interpretation over distinct types DWs.  ...  a dimension in the dimensional hierarchy or by adding a new dimension.  ... 
doi:10.33166/aetic.2021.05.019 fatcat:34x2ijb6vvbvldbi25jupb3ory

A Semantic Similarity Model for Mapping Between Evolving Geospatial Data Cubes [chapter]

Mohamed Bakillah, Mir Abolfazl Mostafavi, Yvan Bédard
2006 Lecture Notes in Computer Science  
This paper proposes a semantic similarity model redefined from a model applied in the ontological field to establish semantic relations between data cubes.  ...  Evolution of multidimensional structures makes difficult, even impossible answering to temporal queries, because of the lack of relationships between different versions of spatial cubes created at different  ...  The authors wish to acknowledge the financial support of Canada NSERC Industrial Research Chair in Geospatial Databases for Decision Support.  ... 
doi:10.1007/11915072_72 fatcat:6gjt3fis65ab7hk45rl3bofopa

Towards Exploratory Olap On Linked Data

Stefano Rizzi, Enrico Gallinucci, Matteo Golfarelli, Alberto Abelló, Oscar Romero
2017 Zenodo  
In this paper we outline an approach that enables users to extend the hierarchies in their corporate cubes through a user-guided process that explores selected linked data and derives hierarchies from  ...  In the context of exploratory OLAP, coupling the information wealth of linked data with the precision and detail of corporate data can greatly improve the effectiveness of the decision-making process.  ...  In particular, the goal of our approach, named iMOLD (Interactive Multidimensional Modeling of Linked Data), is to enable users to extend the hierarchies in the corporate cubes through a user-guided process  ... 
doi:10.5281/zenodo.321627 fatcat:zockn4iopjgfnpa4liuik2luyy

Publishing OLAP Cubes on the Semantic Web [chapter]

Alejandro Vaisman
2016 Lecture Notes in Business Information Processing  
DW & OLAP on the Semantic Web 138 • Mondrian schema: XML document • Defines an MD database • Contains cubes, dimensions, hierarchies, and members, and a mapping to a physical model. • Validates the input  ...  to foster standards for exchanging statistical information • Data set: a set of observations sharing dimensionality • Observation: A point in a multidimensional space mapped to a measure • A dimension  ...  DW & OLAP on the Semantic Web nw:stateName a qb4o:LevelAttribute ; rdfs:label "State Name"@en ; rdfs:range xsd:string . nw:englishStateName a qb4o:LevelAttribute ; rdfs:label "English State Name"@en ;  ... 
doi:10.1007/978-3-319-39243-1_2 fatcat:lhcif5ej3nftpoub6es25ihdae

Transforming statistical linked data for use in OLAP systems

Benedikt Kämpgen, Andreas Harth
2011 Proceedings of the 7th International Conference on Semantic Systems - I-Semantics '11  
We discuss lessons learned from three experiments and identify areas which require future work to ultimately arrive at a well-interlinked set of statistical data from multiple sources which is processable  ...  We provide a mapping from statistical Linked Data into the Multidimensional Model used in data warehouses.  ...  OLAP allows to select Dimensions, Hierarchies, and Levels to query for data from a Cube. It allows to also select Measures to aggregate.  ... 
doi:10.1145/2063518.2063523 dblp:conf/i-semantics/KampgenH11 fatcat:ncxsu5o6bvgbnmshojcihjq6rm

Towards Semantic Geo/BI: A Novel Approach for Semantically Enriching Geo/BI Data with OWL Ontological Layers (OOLAP and ODW) to Enable Semantic Exploration, Analysis and Discovery of Geospatial Business Intelligence Knowledge

Belko Abdoul Aziz Diallo, West African Science Service Centre on Climate Change and Adapted Land Use (WASCAL), Competence Centre, Ouagadougou, Burkina Faso, Aziz Diallo, Frédéric Hubert, Sylvie Daniel
2018 International Journal of Information Engineering and Electronic Business  
The same technique is used by [14] to "integrate Goals with Process Warehouse for Business Process Analysis".  ...  To contribute in filling up the semantic gap in data warehouses and OLAP data cubes, and enable semantic exploration and reasoning on them, this paper highlights the need for semantically augmenting Geo  ...  We also thank the West African Science Service on Climate Change and Adapted Land Use (WASCAL) where the first author is currently acting as Senior Data Manager and Head of IT.  ... 
doi:10.5815/ijieeb.2018.06.01 fatcat:p6qs6aqddrbxnpgqf6oktzo4zm

A Survey Paper on Technologies to Link and Model Multidimensional Data on the Semantic Web for Business Intelligence

2015 International Journal of Science and Research (IJSR)  
This has been further extended to map and model multidimensional data on the Semantic Web in the form of OLAP cubes which are expressed in RDF vocabularies.  ...  This paper surveys the current technologies that provide a platform for building and querying data warehouses on the semantic web using multidimensional OLAP data cubes built using the RDF data cube vocabulary  ...  [12] introduced the Open Cubes Vocabulary (OC), new multidimensional language that supported multiple dimension hierarchies.  ... 
doi:10.21275/v4i12.nov152531 fatcat:yev7x6jarvgnbljbt2odoagot4

Designing multidimensional cubes from warehoused data and linked open data

Franck Ravat, Jiefu Song, Olivier Teste
2016 2016 IEEE Tenth International Conference on Research Challenges in Information Science (RCIS)  
A two-stage process is proposed to build a Unified Cube according to decision-makers' needs.  ...  To demonstrate the feasibility of the proposed concepts, we show how analyses over data from different sources can be carried out through a Unified Cube.  ...  To build a Unified Cube, we describe a two-stage process which unifies relevant data from disparate sources.  ... 
doi:10.1109/rcis.2016.7549337 dblp:conf/rcis/RavatST16 fatcat:rxjgor46hvg7jazvgxrl6rnf7i

Enhancing OLAP Analysis with Web Cubes [chapter]

Lorena Etcheverry, Alejandro A. Vaisman
2012 Lecture Notes in Computer Science  
We introduce Open Cubes, an RDFS vocabulary for the specification and publication of multidimensional cubes on the Semantic Web, and show how classical OLAP operations can be implemented over Open Cubes  ...  using SPARQL 1.1, without the need of mapping the multidimensional information to the local database (the usual approach to multidimensional analysis of Semantic Web data).  ...  Removes one dimension from a cube C.  ... 
doi:10.1007/978-3-642-30284-8_38 fatcat:6jmwidzd4bfj7hcdb7aifgtxeq

A Unified Conceptual Model for Data Warehouses

Shreya Banerjee, Sourabh Bhaskar, Anirban Sarkar, Narayan C. Debnath
2021 Annals of Emerging Technologies in Computing  
These proposed concepts are capable of realizing the cube concepts for visualization of multi-dimensional data in NoSQL based DW solutions.  ...  The objective of this paper is to resolve these challenges by proposing an ontology based formal conceptual model for NoSQL based DWs.  ...  Further, it provides the concepts of data cubes and dimension hierarchies when multi-dimensional data are heterogeneous types, and ranged from structured to semi-structured.  ... 
doi:10.33166/aetic.2021.05.020 fatcat:sswhcmpxtjgldepqaawlihm754
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