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2007 |
Generating Multilingual Descriptions from Linguistically Annotated OWL Ontologies: the NaturalOWL System (Paper in Conference Proceedings) Galanis, Dimitris; Androutsopoulos, Ion Proceedings of the 11th European Workshop on Natural Language Generation (ENLG 2007), Pages: 143-146, 2007. @inproceedings{Galanis2007, title = {Generating Multilingual Descriptions from Linguistically Annotated OWL Ontologies: the NaturalOWL System}, author = {Dimitris Galanis and Ion Androutsopoulos}, url = {http://www.aueb.gr/users/ion/docs/naturalowl_enlg07.pdf}, year = {2007}, date = {2007-01-01}, booktitle = {Proceedings of the 11th European Workshop on Natural Language Generation (ENLG 2007)}, pages = {143-146}, abstract = {We introduce Naturalowl, an open-source multilingual natural language generator that produces descriptions of instances and classes, starting from a linguistically annotated ontology. The generator is heavily based on ideas from ilex and m-piro, but it is in many ways simpler and it provides full support for owl dl ontologies with rdf linguistic annotations. Naturalowl is written in Java, and it is supported by m-piro’s authoring tool, as well as an alternative plug-in for the Protégé ontology editor.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } We introduce Naturalowl, an open-source multilingual natural language generator that produces descriptions of instances and classes, starting from a linguistically annotated ontology. The generator is heavily based on ideas from ilex and m-piro, but it is in many ways simpler and it provides full support for owl dl ontologies with rdf linguistic annotations. Naturalowl is written in Java, and it is supported by m-piro’s authoring tool, as well as an alternative plug-in for the Protégé ontology editor. |
Word Sense Disambiguation with Spreading Activation Networks Generated from Thesauri (Paper in Conference Proceedings) Tsatsaronis, George; Varzigiannis, Michalis; Androutsopoulos, Ion Proceedings of the 20th International Joint Conference on Artificial Intelligence (IJCAI 2007), Pages: 1725-1730, 2007. @inproceedings{Tsatsaronis2007, title = {Word Sense Disambiguation with Spreading Activation Networks Generated from Thesauri}, author = {George Tsatsaronis and Michalis Varzigiannis and Ion Androutsopoulos}, url = {http://www.aueb.gr/users/ion/docs/ijcai2007_wsd_paper.pdf}, year = {2007}, date = {2007-01-01}, booktitle = {Proceedings of the 20th International Joint Conference on Artificial Intelligence (IJCAI 2007)}, pages = {1725-1730}, abstract = {Most word sense disambiguation (WSD) methods require large quantities of manually annotated training data and/or do not exploit fully the semantic relations of thesauri. We propose a new unsupervised WSD algorithm, which is based on generating Spreading Activation Networks (SANs) from the senses of a thesaurus and the relations between them. A new method of assigning weights to the networks’ links is also proposed. Experiments show that the algorithm outperforms previous unsupervised approaches to WSD.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Most word sense disambiguation (WSD) methods require large quantities of manually annotated training data and/or do not exploit fully the semantic relations of thesauri. We propose a new unsupervised WSD algorithm, which is based on generating Spreading Activation Networks (SANs) from the senses of a thesaurus and the relations between them. A new method of assigning weights to the networks’ links is also proposed. Experiments show that the algorithm outperforms previous unsupervised approaches to WSD. |
Η ψηφιακή επιμέλεια των πολιτισμικών συλλογών ως πεδίο γνώσης και πρακτικής (Paper in Conference Proceedings) Dallas, Costis Πρακτικά Ημερίδας της Ελληνικής Ομπσπονδίας Σωματείων Φίλων των Μουσείων (ΕΟΣΦΙΜ), 2007. @inproceedings{Dallas2007, title = {Η ψηφιακή επιμέλεια των πολιτισμικών συλλογών ως πεδίο γνώσης και πρακτικής}, author = {Costis Dallas}, url = {http://www.heritage-museums.com/gr/attachments/article/359/praktika.pdf}, year = {2007}, date = {2007-01-01}, booktitle = {Πρακτικά Ημερίδας της Ελληνικής Ομπσπονδίας Σωματείων Φίλων των Μουσείων (ΕΟΣΦΙΜ)}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
2006 |
Analyzing and Evaluating Usefulness and Usability in Electronic Information Services (Journal Article) Tsakonas, Giannis; Papatheodorou, Christos Journal of Information Science , Volume: 32 (5), Pages: 400-419, 2006. @article{Tsakonas2006, title = {Analyzing and Evaluating Usefulness and Usability in Electronic Information Services}, author = {Giannis Tsakonas and Christos Papatheodorou}, url = {http://jis.sagepub.com/cgi/content/abstract/32/5/400}, year = {2006}, date = {2006-01-02}, journal = {Journal of Information Science }, volume = {32}, number = {5}, pages = {400-419}, abstract = {Digital libraries, e-journal platforms, portals, e-prints and other web-based information systems provide services supporting users to perform intense work tasks that require complex interaction activities. The main components of such services are the users, the offered content and the system on which they are performed. This paper presents a model, which analyses the attributes of the electronic information services' components that affect user interaction and correlates them in the usefulness and usability evaluation process. An experimental study traces the relations between usefulness and usability, indicating that these evaluation parameters are interconnected and users do not find discriminating differences between them. The analysis of the content and system attributes suggests that user interaction is affected equally by content and system characteristics. Finally, the study illustrates users' preference for the attributes that constitute a useful system in contrast to those that support usability.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Digital libraries, e-journal platforms, portals, e-prints and other web-based information systems provide services supporting users to perform intense work tasks that require complex interaction activities. The main components of such services are the users, the offered content and the system on which they are performed. This paper presents a model, which analyses the attributes of the electronic information services' components that affect user interaction and correlates them in the usefulness and usability evaluation process. An experimental study traces the relations between usefulness and usability, indicating that these evaluation parameters are interconnected and users do not find discriminating differences between them. The analysis of the content and system attributes suggests that user interaction is affected equally by content and system characteristics. Finally, the study illustrates users' preference for the attributes that constitute a useful system in contrast to those that support usability. |
Source authoring for multilingual generation of personalised object descriptions (Journal Article) Androutsopoulos, Ion; Oberlander, Jon; Karkaletsis, Vangelis Natural Language Engineering, Volume: 13 (3), Pages: 191-233, 2006. @article{Androutsopoulos2006, title = {Source authoring for multilingual generation of personalised object descriptions}, author = {Ion Androutsopoulos and Jon Oberlander and Vangelis Karkaletsis}, url = {http://www.aueb.gr/users/ion/docs/nle_mpiro.pdf}, year = {2006}, date = {2006-01-02}, journal = {Natural Language Engineering}, volume = {13}, number = {3}, pages = {191-233}, abstract = {We present the source authoring facilities of a natural language generation system that produces personalised descriptions of objects in multiple natural languages starting from language-independent symbolic information in ontologies and databases as well as pieces of canned text. The system has been tested in applications ranging from museum exhibitions to presentations of computer equipment for sale. We discuss the architecture of the overall system, the resources that the authors manipulate, the functionality of the authoring facilities, the system’s personalisation mechanisms, and how they relate to source authoring. A usability evaluation of the authoring facilities is also presented, followed by more recent work on reusing information extracted from existing databases and documents, and supporting the owl ontology specification language. }, keywords = {}, pubstate = {published}, tppubtype = {article} } We present the source authoring facilities of a natural language generation system that produces personalised descriptions of objects in multiple natural languages starting from language-independent symbolic information in ontologies and databases as well as pieces of canned text. The system has been tested in applications ranging from museum exhibitions to presentations of computer equipment for sale. We discuss the architecture of the overall system, the resources that the authors manipulate, the functionality of the authoring facilities, the system’s personalisation mechanisms, and how they relate to source authoring. A usability evaluation of the authoring facilities is also presented, followed by more recent work on reusing information extracted from existing databases and documents, and supporting the owl ontology specification language. |
A Greek Named-Entity Recognizer That Uses Support Vector Machines and Active Learning (Paper in Conference Proceedings) Lucarreli, Giorgos; Androutsopoulos, Ion Advances in Artificial Intelligence. 4th Hellenic Conference on Artificial Intelligence (SETN 2006). Proceedings, Volume: 3955 of the series Lecture Notes in Computer Science Pages: 203-213, 2006. @inproceedings{Lucarreli2006, title = {A Greek Named-Entity Recognizer That Uses Support Vector Machines and Active Learning}, author = {Giorgos Lucarreli and Ion Androutsopoulos}, url = {http://www.aueb.gr/users/ion/docs/setn2006_paper.pdf}, year = {2006}, date = {2006-01-02}, booktitle = {Advances in Artificial Intelligence. 4th Hellenic Conference on Artificial Intelligence (SETN 2006). Proceedings}, volume = {3955}, pages = {203-213}, series = {Lecture Notes in Computer Science}, abstract = {We present a named-entity recognizer forGreek person names and temporal expressions. For temporal expressions, it relies on semiautomatically produced patterns. For person names, it employs two Support Vector Machines, that scan the input text in two passes, and active learning, which reduces the human annotation effort during training.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } We present a named-entity recognizer forGreek person names and temporal expressions. For temporal expressions, it relies on semiautomatically produced patterns. For person names, it employs two Support Vector Machines, that scan the input text in two passes, and active learning, which reduces the human annotation effort during training. |
2005 |
A Practically Unsupervised Learning Method to Identify Single-Snippet Answers to Definition Questions on theWeb (Paper in Conference Proceedings) Androutsopoulos, Ion; Galanis, Dimitris Proceedings of the conference on Human Language Technology and Empirical Methods in Natural Language Processing, of the series HLT '05 Pages: 323-330, Association for Computational Linguistics, 2005. @inproceedings{Androutsopoulos2005, title = {A Practically Unsupervised Learning Method to Identify Single-Snippet Answers to Definition Questions on theWeb}, author = {Ion Androutsopoulos and Dimitris Galanis}, url = {http://www.aueb.gr/users/ion/docs/hltemnlp2005_paper.pdf}, year = {2005}, date = {2005-01-03}, booktitle = {Proceedings of the conference on Human Language Technology and Empirical Methods in Natural Language Processing}, pages = {323-330}, publisher = {Association for Computational Linguistics}, series = {HLT '05}, abstract = {We present a practically unsupervised learning method to produce single-snippet answers to definition questions in question answering systems that supplement Web search engines. The method exploits on-line encyclopedias and dictionaries to generate automatically an arbitrarily large number of positive and negative definition examples, which are then used to train an SVM to separate the two classes. We show experimentally that the proposed method is viable, that it outperforms the alternative of training the system on questions and news articles from TREC, and that it helps the search engine handle definition questions significantly better.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } We present a practically unsupervised learning method to produce single-snippet answers to definition questions in question answering systems that supplement Web search engines. The method exploits on-line encyclopedias and dictionaries to generate automatically an arbitrarily large number of positive and negative definition examples, which are then used to train an SVM to separate the two classes. We show experimentally that the proposed method is viable, that it outperforms the alternative of training the system on questions and news articles from TREC, and that it helps the search engine handle definition questions significantly better. |
2004 |
Learning to Identify Single-Snippet Answers to Definition Questions (Paper in Conference Proceedings) Miliaraki, Spyridoula; Androutsopoulos, Ion Proceedings of the 20th International Conference on Computational Linguistics (COLING 2004), Pages: 1360-1366, 2004. @inproceedings{Miliaraki2004, title = {Learning to Identify Single-Snippet Answers to Definition Questions}, author = {Spyridoula Miliaraki and Ion Androutsopoulos}, url = {http://www.aueb.gr/users/ion/docs/coling04_definition_questions.pdf}, year = {2004}, date = {2004-01-01}, booktitle = {Proceedings of the 20th International Conference on Computational Linguistics (COLING 2004)}, pages = {1360-1366}, abstract = {We present a learning-based method to identify single-snippet answers to definition questions in question answering systems for document collections. Our method combines and extends two previous techniques that were based mostly on manually crafted lexical patterns and WordNet hypernyms. We train a Support Vector Machine (SVM) on vectors comprising the verdicts or attributes of the previous techniques, and additional phrasal attributes that we acquire automatically. The SVM is then used to identify and rank single 250-character snippets that contain answers to definition questions. Experimental results indicate that our method clearly outperforms the techniques it builds upon.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } We present a learning-based method to identify single-snippet answers to definition questions in question answering systems for document collections. Our method combines and extends two previous techniques that were based mostly on manually crafted lexical patterns and WordNet hypernyms. We train a Support Vector Machine (SVM) on vectors comprising the verdicts or attributes of the previous techniques, and additional phrasal attributes that we acquire automatically. The SVM is then used to identify and rank single 250-character snippets that contain answers to definition questions. Experimental results indicate that our method clearly outperforms the techniques it builds upon. |
2003 |
Natural Language Interaction (Book Chapter) Androutsopoulos, Ion; Aretoulaki, Maria Mitkov, (Ed.): The Oxford Handbook of Computational Linguistics, Chapter 35, Pages: 629-649, Oxford University Press, 2003. @inbook{Androutsopoulos2003, title = {Natural Language Interaction}, author = {Ion Androutsopoulos and Maria Aretoulaki}, editor = {R. Mitkov}, url = {http://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199276349.001.0001/oxfordhb-9780199276349-e-35}, doi = {10.1093/oxfordhb/9780199276349.013.0035}, year = {2003}, date = {2003-01-01}, booktitle = {The Oxford Handbook of Computational Linguistics}, pages = {629-649}, publisher = {Oxford University Press}, chapter = {35}, abstract = {This article introduces natural language interaction (NLI) systems. NLI systems are systems that allow their users to formulate requests in spoken or written natural language. This article highlights the central concepts of natural language interaction systems. NLI systems refer to applications where users can formulate requests addressed to a computer in natural language. Database querying constitutes the most studied form of NLIs. Database NLIs allow information to be retrieved from an underlying database by typing single-sentence queries. This article draws attention to the basic components of an NLI system and gives an overview of spoken dialogue systems (SDS). Apart from giving information about the several applications where NLIs and SDS are being explored, this article concludes with a discussion of more ambitious forms of natural language interaction that may become possible in the longer term.}, keywords = {}, pubstate = {published}, tppubtype = {inbook} } This article introduces natural language interaction (NLI) systems. NLI systems are systems that allow their users to formulate requests in spoken or written natural language. This article highlights the central concepts of natural language interaction systems. NLI systems refer to applications where users can formulate requests addressed to a computer in natural language. Database querying constitutes the most studied form of NLIs. Database NLIs allow information to be retrieved from an underlying database by typing single-sentence queries. This article draws attention to the basic components of an NLI system and gives an overview of spoken dialogue systems (SDS). Apart from giving information about the several applications where NLIs and SDS are being explored, this article concludes with a discussion of more ambitious forms of natural language interaction that may become possible in the longer term. |
Speaking the Users’ Languages (Journal Article) Isard, Amy; Oberlander, Jon; Matheson, Colin; Androutsopoulos, Ion IEEE Intelligent Systems, Volume: 18 (1), Pages: 40-45, 2003. @article{Isard2003, title = {Speaking the Users’ Languages}, author = {Amy Isard and Jon Oberlander and Colin Matheson and Ion Androutsopoulos }, url = {http://www.aueb.gr/users/ion/docs/ieeeis_speaking_the_users_languages.pdf}, year = {2003}, date = {2003-01-01}, journal = {IEEE Intelligent Systems}, volume = {18}, number = {1}, pages = {40-45}, abstract = {The authors describe a system that generates descriptions of museum objects tailored to the user. The texts presented to adults, children, and experts differ in several ways, from the choice of words used to the complexity of the sentence forms.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The authors describe a system that generates descriptions of museum objects tailored to the user. The texts presented to adults, children, and experts differ in several ways, from the choice of words used to the complexity of the sentence forms. |
2002 |
Exploring Time, Tense and Aspect in Natural Language Database Interfaces (Book) Androutsopoulos, Ion John Benjamins Publishing Company, 2002, ISBN: 9789027249906. @book{Androutsopoulos2002, title = {Exploring Time, Tense and Aspect in Natural Language Database Interfaces}, author = {Ion Androutsopoulos}, url = {https://www.benjamins.com/#catalog/books/nlp.6/main}, doi = {10.1075/nlp.6}, isbn = {9789027249906}, year = {2002}, date = {2002-01-01}, publisher = {John Benjamins Publishing Company}, abstract = {Advances in temporal databases make it increasingly easier to store time-dependent information, creating a need for facilities that will help end-users access this information. In the context of natural language interaction, significant effort has been devoted to interfaces that allow database queries to be formulated in natural language. Most of the existing interfaces, however, do not support adequately the notion of time. Drawing upon tense and aspect theories, temporal logics, and temporal databases, this cross-discipline book examines relevant issues from the three areas, developing a unified theoretical framework that can be used to build natural language interfaces to temporal databases. The framework features an HPSG mapping from English to a formally defined meaning representation language, and a corresponding mapping to a temporal extension of the SQL database language. The book is accompanied by a freely available prototype interface, built according to the framework, and implemented using Prolog and ALE. This is the first in-depth exploration of the notion of time in natural language database interfaces. It will be particularly interesting to researchers working on natural language interaction, tense and aspect, HPSG, temporal logics, and temporal databases, especially those who wish to learn about time-related issues in other disciplines.}, keywords = {}, pubstate = {published}, tppubtype = {book} } Advances in temporal databases make it increasingly easier to store time-dependent information, creating a need for facilities that will help end-users access this information. In the context of natural language interaction, significant effort has been devoted to interfaces that allow database queries to be formulated in natural language. Most of the existing interfaces, however, do not support adequately the notion of time. Drawing upon tense and aspect theories, temporal logics, and temporal databases, this cross-discipline book examines relevant issues from the three areas, developing a unified theoretical framework that can be used to build natural language interfaces to temporal databases. The framework features an HPSG mapping from English to a formally defined meaning representation language, and a corresponding mapping to a temporal extension of the SQL database language. The book is accompanied by a freely available prototype interface, built according to the framework, and implemented using Prolog and ALE. This is the first in-depth exploration of the notion of time in natural language database interfaces. It will be particularly interesting to researchers working on natural language interaction, tense and aspect, HPSG, temporal logics, and temporal databases, especially those who wish to learn about time-related issues in other disciplines. |
2000 |
Database Interfaces (Book Chapter) Androutsopoulos, Ion; Ritchie, Graeme R. Dale H. Moisl,; Somers, (Ed.): Handbook of Natural Language Processing, Chapter 9, Pages: 209-240, Marcel Dekker Inc., 2000, ISBN: 0824790006. @inbook{Androutsopoulos2000, title = {Database Interfaces}, author = {Ion Androutsopoulos and Graeme Ritchie}, editor = {R. Dale, H. Moisl, and H. Somers}, url = {http://dl.acm.org/citation.cfm?id=555864}, isbn = {0824790006}, year = {2000}, date = {2000-01-01}, booktitle = {Handbook of Natural Language Processing}, pages = {209-240}, publisher = {Marcel Dekker Inc.}, chapter = {9}, keywords = {}, pubstate = {published}, tppubtype = {inbook} } |
