Onto.PT: Towards the Automatic Construction of a Lexical Ontology ...

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Onto.PT, uma ontologia lexical, estruturada de forma semelhante a uma wordnet. Além disso, fornecemos uma visão global da versão actual do Onto.PT e apresentamos alguns cenários onde este recurso pode ter grande utilidade. O Onto.PT, que poderá futuramente ser aumentado, pode ser descarregado livremente e utilizado num grande leque de tarefas relacionadas com o processamento computacional do português, tal como a WordNet é para o inglês. Acreditamos que, apesar das limitações actuais de uma abordagem automática para a sua construção, o Onto.PT poderá contribuir para um avanço no estado da arte do processamento computacional da nossa língua.
Contents Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Research Goals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3 Contributions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.4 Outline of the thesis . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Chapter 2: Background Knowledge . . . . . . . . . . . . . . . . . . . . . 9 2.1 Lexical Semantics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.1 Relational Approaches . . . . . . . . . . . . . . . . . . . . . . 10 2.1.2 Semantic Relations . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 Lexical Knowledge Formalisms and Resources . . . . . . . . . . . . . 14 2.2.1 Representation of Meaning . . . . . . . . . . . . . . . . . . . . 14 2.2.2 Thesauri . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2.3 Lexical Networks . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2.4 Lexical Ontologies . . . . . . . . . . . . . . . . . . . . . . . . 19 2.2.5 The Generative Lexicon . . . . . . . . . . . . . . . . . . . . . 19 2.3 Information Extraction from Text . . . . . . . . . . . . . . . . . . . . 21 2.3.1 Tasks in Information Extraction from Text . . . . . . . . . . . 21 2.3.2 Information Extraction Techniques . . . . . . . . . . . . . . . 22 2.4 Remarks on this section . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.4.1 Knowledge representation in our work . . . . . . . . . . . . . 24 2.4.2 Information Extraction techniques in our work . . . . . . . . . 24 Chapter 3: Related Work . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1 Lexical Knowledge Bases . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.1.1 Popular Lexical Knowledge Bases . . . . . . . . . . . . . . . . 27 3.1.2 Portuguese Lexical Knowledge Bases . . . . . . . . . . . . . . 32 3.2 Lexical-Semantic Information Extraction . . . . . . . . . . . . . . . . 38 3.2.1 Information Extraction from Electronic Dictionaries . . . . . . 39 3.2.2 Information Extraction from Textual Corpora . . . . . . . . . 44 3.3 Enrichment and Integration of Lexical Knowledge Bases . . . . . . . 53 3.4 Remarks on this section . . . . . . . . . . . . . . . . . . . . . . . . . 54 Chapter 4: Acquisition of Semantic Relations . . . . . . . . . . . . . . 57 4.1 Semantic relations from definitions . . . . . . . . . . . . . . . . . . . 58 4.2 A large lexical network for Portuguese . . . . . . . . . . . . . . . . . 60 4.2.1 About the dictionaries . . . . . . . . . . . . . . . . . . . . . . 61 4.2.2 Definitions format . . . . . . . . . . . . . . . . . . . . . . . . . 61
Page 1: PhD Thesis Doctoral Program in Info
Page 5: Preface About six years ago, almost
Page 9: Resumo Não há grandes dúvidas qu
Page 13: 8.2.1 Semantic Web model . . . . .
Page 16 and 17: 6.1 Illustrative synonymy network.
Page 18 and 19: 6.3 Evaluation against intersection
Page 21 and 22: Chapter 1 Introduction A substantia
Page 23 and 24: 1.2. Approach 5 • They are not bu
Page 25 and 26: 1.4. Outline of the thesis 7 which
Page 27 and 28: Chapter 2 Background Knowledge The
Page 29 and 30: 2.1. Lexical Semantics 11 that, in
Page 31 and 32: 2.1. Lexical Semantics 13 Meronymy
Page 33 and 34: 2.2. Lexical Knowledge Formalisms a
Page 39 and 40: 2.3. Information Extraction from Te
Page 41 and 42: 2.3. Information Extraction from Te
Page 43: 2.4. Remarks on this section 25 usi
Page 46 and 47: 28 Chapter 3. Related Work in group
Page 48 and 49: 30 Chapter 3. Related Work ple rela
Page 50 and 51: 32 Chapter 3. Related Work knowledg
Page 52 and 53: 34 Chapter 3. Related Work the ELRA
Page 54 and 55: 36 Chapter 3. Related Work resource
Page 56 and 57: 38 Chapter 3. Related Work English
Page 58 and 59: 40 Chapter 3. Related Work of super
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42 Chapter 3. Related Work • part
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44 Chapter 3. Related Work LSIE fro
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46 Chapter 3. Related Work modifier
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48 Chapter 3. Related Work 6. {,}
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50 Chapter 3. Related Work 1. Extra
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52 Chapter 3. Related Work Due to t
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54 Chapter 3. Related Work comparis
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56 Chapter 3. Related Work creation
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58 Chapter 4. Acquisition of Semant
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80 Chapter 5. Synset Discovery Ther
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82 Chapter 5. Synset Discovery the
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84 Chapter 5. Synset Discovery tb-t
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86 Chapter 5. Synset Discovery cota
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88 Chapter 5. Synset Discovery θ W
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90 Chapter 5. Synset Discovery Tabl
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92 Chapter 5. Synset Discovery word
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Chapter 6 Thesaurus Enrichment Gene
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6.1. Automatic Assignment of synpai
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6.2. Evaluation of the assignment p
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6.3. Clustering and integrating new
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6.4. A large thesaurus for Portugue
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6.5. Discussion 111 Another contrib
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114 Chapter 7. Moving from term-bas
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Chapter 8 Onto.PT: a lexical ontolo
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8.1. Overview 133 items inside a sy
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8.2. Access and Availability 135 no
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8.2. Access and Availability 137 Ex
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8.3. Evaluation 139 Figure 8.3: Ins
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8.3. Evaluation 141 the most reliab
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8.3. Evaluation 143 imation of the
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8.3. Evaluation 145 Relation parteD
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8.4. Using Onto.PT 147 • S: (n) a
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8.4. Using Onto.PT 149 todos os fun
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8.4. Using Onto.PT 151 In addition
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8.4. Using Onto.PT 153 based approa
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8.4. Using Onto.PT 155 Uma populaç
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158 Chapter 9. Final discussion 3.
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160 Chapter 9. Final discussion - G
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162 Chapter 9. Final discussion Any
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References Agichtein, E. and Gravan
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References 167 for storing and quer
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References 169 15th International C
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References 171 Symposium (STAIRS 20
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References 173 Hovy, E., Hermjakob,
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References 175 ACM, 38(11):39-41. M
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References 177 ACL Press. Partee, B
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References 179 Russell, S. and Norv
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References 181 Proceedings of 13th
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Appendix A Description of the extra
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• x propriedadeDeAlgoQueCausa y -
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• x antonimoAdjDe y Property - x
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190 Appendix B. Coverage of EuroWor
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