Incremental ontology extension:
Gespeichert in:
| 1. Verfasser: | |
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Bremen
2010
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| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | vii, 248 Seiten Illustrationen, Diagramme |
Internformat
MARC
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Datensatz im Suchindex
| _version_ | 1804178981973393408 |
|---|---|
| adam_text | Contents
1 Introduction 1
2 Ontology Extension 5
2.1 Ontologies........................................................... 7
2.1.1 Ontological Structure........................................ 7
2.1.2 Levels of Specificity........................................ 8
2.1.3 Ontological Choices......................................... 10
2.2 Ontology Extension.................................................. 10
2.2.1 Data Sources................................................ 15
2.2.2 Information Extraction...................................... 16
2.2.3 Word-To-Concept Mapping..................................... 17
2.2.4 Ontology Insertion.......................................... 18
2.3 Basic Methods ...................................................... 19
2.3.1 Pre-Processing.............................................. 19
2.3.2 Pattern-based Methods........................................25
2.3.3 Machine Learning.............................................25
2.4 Evaluation Methods...................................................41
2.4.1 Metrics for Inter-Annotator Agreement........................42
2.4.2 Metrics for Evaluation.......................................42
2.5 State of the Art.....................................................44
2.5.1 Ontology Learning from Unstructured Text.....................45
2.5.2 Ontology Learning from Semi-Structured Text..................48
2.5.3 Ontology Learning Frameworks.................................49
2.6 Conclusions..........................................................50
v
VI
Contents
3 Incremental Ontology Extension 53
3.1 Tasks and Solutions..................................................55
3.1.1 Task Definition..............................................55
3.1.2 Solution.....................................................56
3.2 The Incremental Ontology Extension Framework.......................67
3.2.1 Prerequisites................................................67
3.2.2 Workflow.....................................................70
3.3 Conclusions..........................................................76
4 Implementation and Evaluation 79
4.1 Hypemym Discovery with Encyclopedias..............................79
4.1.1 The Approach.................................................80
4.1.2 Data Collection and Preparation..............................82
4.1.3 Baseline 1: Employing Syntactic Information..................86
4.1.4 Baseline 2: Lexico-Syntactic Patterns........................86
4.1.5 Syntactic-Semantic Tagging...................................89
4.1.6 Evaluation and Results.......................................93
4.1.7 Conclusions..................................................109
4.2 Hypemym Discovery from the Web.......................................Ill
4.2.1 The Approach.................................................Ill
4.2.2 Data Collection and Preparation..............................114
4.2.3 Baseline: Frequency, Synonymy and Compounds..................121
4.2.4 Classification...............................................122
4.2.5 Evaluation and Results.......................................125
4.2.6 Conclusions..................................................132
4.3 Web Document Clustering..............................................134
4.3.1 The Approach................................................ 134
4.3.2 Data Collection and Preparation..............................137
4.3.3 Document Clustering..........................................140
4.3.4 Evaluation and Results.......................................147
4.3.5 Conclusions..................................................157
4.4 Attribute Value Extraction from the Web..............................159
4.4.1 The Approach.................................................160
4.4.2 Data Collection and Preparation..............................163
4.4.3 Baseline: Conditional Random Fields..........................164
4.4.4 Semi-Supervised Approach ....................................167
4.4.5 Evaluation and Results.......................................169
4.4.6 Conclusions ................................................ 175
Vil
5 Application 181
5.1 The Project S mart Web.............................................181
5.2 Architecture of the Smart Web System...............................182
5.3 Speech Recognition.................................................184
5.4 Language Understanding.............................................185
5.5 Context Module.....................................................186
5.6 Incremental Ontology Extension Framework...........................187
5.6.1 Work How....................................................187
5.6.2 Information Extraction......................................189
5.6.3 Word-to-Concept Mapping.....................................189
5.6.4 Ontology Insertion..........................................190
5.7 Conclusions........................................................192
6 Conclusions 195
A Appendix 199
A.l Prediction of most likely Part of Speech.............................199
A.2 Listed Meanings for Lotus on Wikipedia...............................200
A.3 Stuttgart-Tuebingen Tagset...........................................202
A.4 Hypemym Discovery from the Web: Search Queries ......................205
A.5 Web Document Clustering: Stopwordlist................................207
A.6 Web Document Clustering: Result Tables...............................208
A.7 Attribute Value Extraction: POS Clusters from the Unsupervised Tagger 217
List of Figures 221
List of Tables 225
References
227
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| spelling | Litz, Berenike Verfasser (DE-588)141919701 aut Incremental ontology extension von Berenike Litz Bremen 2010 vii, 248 Seiten Illustrationen, Diagramme txt rdacontent n rdamedia nc rdacarrier Dissertation Universität Bremen 2010 (DE-588)4113937-9 Hochschulschrift gnd-content Digitalisierung UB Regensburg - ADAM Catalogue Enrichment application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=030631885&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
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| title | Incremental ontology extension |
| title_auth | Incremental ontology extension |
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| title_full | Incremental ontology extension von Berenike Litz |
| title_fullStr | Incremental ontology extension von Berenike Litz |
| title_full_unstemmed | Incremental ontology extension von Berenike Litz |
| title_short | Incremental ontology extension |
| title_sort | incremental ontology extension |
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