Data exploration process based on the self-organizing map

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorVesanto, Juha 
dc.contributor.departmentDepartment of Computer Science and Engineeringen
dc.contributor.departmentTietotekniikan osastofi
dc.date.accessioned2012-02-10T09:20:16Z
dc.date.available2012-02-10T09:20:16Z
dc.date.issued2002-05-16 
dc.description.abstractWith the advances in computer technology, the amount of data that is obtained from various sources and stored in electronic media is growing at exponential rates. Data mining is a research area which answers to the challange of analysing this data in order to find useful information contained therein. The Self-Organizing Map (SOM) is one of the methods used in data mining. It quantizes the training data into a representative set of prototype vectors and maps them on a low-dimensional grid. The SOM is a prominent tool in the initial exploratory phase in data mining. The thesis consists of an introduction and ten publications. In the publications, the validity of SOM-based data exploration methods has been investigated and various enhancements to them have been proposed. In the introduction, these methods are presented as parts of the data mining process, and they are compared with other data exploration methods with similar aims. The work makes two primary contributions. Firstly, it has been shown that the SOM provides a versatile platform on top of which various data exploration methods can be efficiently constructed. New methods and measures for visualization of data, clustering, cluster characterization, and quantization have been proposed. The SOM algorithm and the proposed methods and measures have been implemented as a set of Matlab routines in the SOM Toolbox software library. Secondly, a framework for SOM-based data exploration of table-format data - both single tables and hierarchically organized tables - has been constructed. The framework divides exploratory data analysis into several sub-tasks, most notably the analysis of samples and the analysis of variables. The analysis methods are applied autonomously and their results are provided in a report describing the most important properties of the data manifold. In such a framework, the attention of the data miner can be directed more towards the actual data exploration task, rather than on the application of the analysis methods. Because of the highly iterative nature of the data exploration, the automation of routine analysis tasks can reduce the time needed by the data exploration process considerably.en
dc.description.versionrevieweden
dc.format.extent86, [103] 
dc.format.mimetypeapplication/pdf 
dc.identifier.isbn951-22-5897-8 
dc.identifier.issn1456-9418 
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/2178
dc.identifier.urnurn:nbn:fi:tkk-001489 
dc.language.isoenen
dc.publisherHelsinki University of Technologyen
dc.publisherTeknillinen korkeakoulufi
dc.relation.haspartJuha Vesanto (1997). Using the SOM and Local Models in Time-Series Prediction. In Proceedings of Workshop on Self-Organizing Maps (WSOM'97), Espoo, Finland, pp. 209-214. [article1.pdf] © 1997 HUT. By permission. 
dc.relation.haspartEsa Alhoniemi, Jaakko Hollmén, Olli Simula and Juha Vesanto (1999). Process Monitoring and Modeling Using the Self-Organizing Map. In Integrated Computer Aided Engineering Volume 6, Number 1, IOS Press, pp. 3-14. [article2.pdf] © 1999 IOS Press. By permission. 
dc.relation.haspartJuha Vesanto (1999). SOM-Based Data Visualization Methods. In Intelligent Data Analysis, Volume 3, Number 2, Elsevier Science, pp. 111-126. [article3.pdf] © 1999 IOS Press. By permission. 
dc.relation.haspartEsa Alhoniemi, Johan Himberg and Juha Vesanto (1999). Probabilistic Measures for Responses of Self-Organizing Map Units. In Proceeding of the International ICSC Congress on Computational Intelligence Methods and Applications (CIMA'99), ICSC Academic Press, pp. 286-290. [article4.pdf] © 1999 ICSC. By permission. 
dc.relation.haspartJuha Vesanto and Jussi Ahola (1999). Hunting for Correlations in Data Using the Self-Organizing Map. In Proceeding of the International ICSC Congress on Computational Intelligence Methods and Applications (CIMA'99), ICSC Academic Press, pp. 279-285. [article5.pdf] © 1999 ICSC. By permission. 
dc.relation.haspartJuha Vesanto, Johan Himberg, Esa Alhoniemi and Juha Parhankangas (1999). Self-Organizing Map in Matlab: the SOM Toolbox. In Proceedings of the Matlab DSP Conference 1999, Espoo, Finland, pp. 35-40. [article6.pdf] © 1999 Comsol Oy. By permission. 
dc.relation.haspartJuha Vesanto and Esa Alhoniemi (2000). Clustering of the Self-Organizing Map. In IEEE Transactions on Neural Networks, Volume 11, Number 3, pp. 586-600. [article7.pdf] © 2000 IEEE. By permission. 
dc.relation.haspartJuha Vesanto (2001). Importance of Individual Variables in the k-Means Algorithm. In Proceedings of the Pacific-Asia Conference Advances in Knowledge Discovery and Data Mining (PAKDD2001), Springer-Verlag, pp. 513-518. [article8.pdf] © 2001 Springer-Verlag. By permission. 
dc.relation.haspartMarkus Siponen, Juha Vesanto, Olli Simula and Petri Vasara (2001). An Approach to Automated Interpretation of SOM. In Proceedings of Workshop on Self-Organizing Map 2001 (WSOM2001), Springer, pp. 89-94. [article9.pdf] © 2001 Springer-Verlag. By permission. 
dc.relation.haspartJuha Vesanto and Jaakko Hollmén (2002). An Automated Report Generation Tool for the Data Understanding Phase. In Hybrid Information Systems, edited by A. Abraham and M. Köppen, Physica Verlag, Heidelberg, pp. 611-626. [article10.pdf] © 2002 Springer-Verlag. By permission. 
dc.relation.ispartofseriesActa polytechnica Scandinavica. Ma, Mathematics and computing seriesen
dc.relation.ispartofseries115en
dc.subject.keywordself-organizing mapen
dc.subject.keywordexploratory data analysisen
dc.subject.keyworddata miningen
dc.subject.keywordvisualizationen
dc.subject.keywordclusteringen
dc.subject.keywordvector quantizationen
dc.subject.otherComputer scienceen
dc.titleData exploration process based on the self-organizing mapen
dc.typeG5 Artikkeliväitöskirjafi
dc.type.dcmitypetexten
dc.type.ontasotVäitöskirja (artikkeli)fi
dc.type.ontasotDoctoral dissertation (article-based)en
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local.aalto.digifolderAalto_63593
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