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Bergen Open Research Archive - UiB
Doctoral thesis . 2019
License: CC BY NC
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Automated analysis of Norwegian text

Authors: Johansen, Bjarte;

Automated analysis of Norwegian text

Abstract

In this thesis we look at how we can develop automated analysis tools for Norwegian text. We look at 3 different tasks: Part-of-Speech (PoS) tagging, Named-Entity Chunking (NEC), and Named-Entity Recognition (NER). For our work on PoS tagging, we extend the work done on the OBT+Stat tagger by training a new model to allow it to also do disambiguation of Nynorsk. We work with Googles SyntaxNet and train it for PoS tagging of Bokmål and Nynorsk, showing state of the art results at the time of the research. We train a Support Vector Machine for NEC of Bokmål. The task of extracting names from text. Next, we develop a NER model using deep learning and provide a NER sequence tagger for Bokmål and Nynorsk. The Nynorsk tagger is the first NER model for Nynorsk that we are aware of. The best performing model is trained on both language forms. It shows better performance on both Bokmål and Nynorsk than the models we trained individually on the language forms. At last we show how we can use NEC and NER together with Social Network Analysis tools to investigate two case studies around the news story discussing the consequence study of drilling for oil in Lofoten, Vesterålen, and Senja. In the first case study we show that it is possible to find the thematic structures of a news story by analysing the relationship between the entities in the text. In the second case study, using topic modelling, we find the topics, and who the most important persons are for each topic.

Country
Norway
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Keywords

400, 004

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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