2009 |
DCC&U: An Extended Digital Curation Lifecycle Model (Journal Article) Constantopoulos, Panos; Dallas, Costis; Androutsopoulos, Ion; Angelis, Stavros; Deligiannakis, Antonios; Gavrilis, Dimitris; Kotidis, Yiannis; Papatheodorou, Christos The International Journal of Digital Curation, Volume: 4 (1), Pages: 34-45, 2009. @article{Constantopoulos2009, title = {DCC&U: An Extended Digital Curation Lifecycle Model}, author = {Panos Constantopoulos and Costis Dallas and Ion Androutsopoulos and Stavros Angelis and Antonios Deligiannakis and Dimitris Gavrilis and Yiannis Kotidis and Christos Papatheodorou}, url = {http://www.ijdc.net/index.php/ijdc/article/viewFile/100/75}, year = {2009}, date = {2009-01-01}, journal = {The International Journal of Digital Curation}, volume = {4}, number = {1}, pages = {34-45}, abstract = {The proliferation of Web, database and social networking technologies has enabled us to produce, publish and exchange digital assets at an enormous rate. This vast amount of information that is either digitized or born-digital needs to be collected, organized and preserved in a way that ensures that our digital assets and the information they carry remain available for future use. Digital curation has emerged as a new inter-disciplinary practice that seeks to set guidelines for disciplined management of information. In this paper we review two recent models for digital curation introduced by the Digital Curation Centre (DCC) and the Digital Curation Unit (DCU) of the Athena Research Centre. We then propose a fusion of the two models that highlights the need to extend the digital curation lifecycle by adding (a) provisions for the registration of usage experience, (b) a stage for knowledge enhancement and (c) controlled vocabularies used by convention to denote concepts, properties and relations. The objective of the proposed extensions is twofold: (i) to provide a more complete lifecycle model for the digital curation domain; and (ii) to provide a stimulus for a broader discussion on the research agenda.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The proliferation of Web, database and social networking technologies has enabled us to produce, publish and exchange digital assets at an enormous rate. This vast amount of information that is either digitized or born-digital needs to be collected, organized and preserved in a way that ensures that our digital assets and the information they carry remain available for future use. Digital curation has emerged as a new inter-disciplinary practice that seeks to set guidelines for disciplined management of information. In this paper we review two recent models for digital curation introduced by the Digital Curation Centre (DCC) and the Digital Curation Unit (DCU) of the Athena Research Centre. We then propose a fusion of the two models that highlights the need to extend the digital curation lifecycle by adding (a) provisions for the registration of usage experience, (b) a stage for knowledge enhancement and (c) controlled vocabularies used by convention to denote concepts, properties and relations. The objective of the proposed extensions is twofold: (i) to provide a more complete lifecycle model for the digital curation domain; and (ii) to provide a stimulus for a broader discussion on the research agenda. |
2008 |
Exploring usefulness and usability in the evaluation of open access digital libraries (Journal Article) Tsakonas, Giannis; Papatheodorou, Christos Information Processing and Management: an International Journal, Volume: 44 (3), Pages: 1234-1250, 2008. @article{Tsakonas2008, title = {Exploring usefulness and usability in the evaluation of open access digital libraries}, author = {Giannis Tsakonas and Christos Papatheodorou}, url = {http://dl.acm.org/citation.cfm?id=1351371}, year = {2008}, date = {2008-01-01}, journal = {Information Processing and Management: an International Journal}, volume = {44}, number = {3}, pages = {1234-1250}, abstract = {Advances in the publishing world have emerged new models of digital library development. Open access publishing modes are expanding their presence and realize the digital library idea in various means. While user-centered evaluation of digital libraries has drawn considerable attention during the last years, these systems are currently viewed from the publishing, economic and scientometric perspectives. The present study explores the concepts of usefulness and usability in the evaluation of an e-print archive. The results demonstrate that several attributes of usefulness, such as the level and the relevance of information, and usability, such as easiness of use and learnability, as well as functionalities commonly met in these systems, affect user interaction and satisfaction. }, keywords = {}, pubstate = {published}, tppubtype = {article} } Advances in the publishing world have emerged new models of digital library development. Open access publishing modes are expanding their presence and realize the digital library idea in various means. While user-centered evaluation of digital libraries has drawn considerable attention during the last years, these systems are currently viewed from the publishing, economic and scientometric perspectives. The present study explores the concepts of usefulness and usability in the evaluation of an e-print archive. The results demonstrate that several attributes of usefulness, such as the level and the relevance of information, and usability, such as easiness of use and learnability, as well as functionalities commonly met in these systems, affect user interaction and satisfaction. |
2007 |
A multi-layer metadata schema for digital folklore collections (Journal Article) Lourdi, Irene; Papatheodorou, Christos; Nikolaidou, Mara Journal of Information Science, Volume: 33 (2), Pages: 197-213, 2007. @article{Lourdi2007, title = {A multi-layer metadata schema for digital folklore collections}, author = {Irene Lourdi and Christos Papatheodorou and Mara Nikolaidou}, url = {http://jis.sagepub.com/cgi/content/abstract/33/2/197}, year = {2007}, date = {2007-01-02}, journal = {Journal of Information Science}, volume = {33}, number = {2}, pages = {197-213}, abstract = {Digital folklore collections are valuable sources for studying the cultural and oral tradition of a country. The main difficulty in managing such collections is material heterogeneity (handwritten texts, photographs, 3D objects, sound recordings etc.) that imposes different digitization, description and maintenance practices. A multi-layer metadata model for the description of a digital folklore collection is presented. The proposed meta-data policy considers a collection as a hierarchy of entities and combines different metadata schemas for the management of each entity. The metadata model integrates elements from different metadata schemas ensuring efficient information recovery from all structural levels. Furthermore, interoperability between the used metadata schemas is discussed and a Topic Maps model is presented as an approach for developing mappings.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Digital folklore collections are valuable sources for studying the cultural and oral tradition of a country. The main difficulty in managing such collections is material heterogeneity (handwritten texts, photographs, 3D objects, sound recordings etc.) that imposes different digitization, description and maintenance practices. A multi-layer metadata model for the description of a digital folklore collection is presented. The proposed meta-data policy considers a collection as a hierarchy of entities and combines different metadata schemas for the management of each entity. The metadata model integrates elements from different metadata schemas ensuring efficient information recovery from all structural levels. Furthermore, interoperability between the used metadata schemas is discussed and a Topic Maps model is presented as an approach for developing mappings. |
Named Entity Recognition in Greek Texts with an Ensemble of SVMs and Active Learning (Journal Article) Lucarreli, Giorgios; Vasilakos, Xenofon; Androutsopoulos, Ion International Journal on Artificial Intelligence Tools (IJAIT), Volume: 16 (6), Pages: 1015 - 1045, 2007. @article{Lucarreli2007, title = {Named Entity Recognition in Greek Texts with an Ensemble of SVMs and Active Learning}, author = {Giorgios Lucarreli and Xenofon Vasilakos and Ion Androutsopoulos}, url = {http://db0.worldscinet.com/worldsci-staging/detail.nsp}, year = {2007}, date = {2007-01-01}, journal = {International Journal on Artificial Intelligence Tools (IJAIT)}, volume = {16}, number = {6}, pages = {1015 - 1045}, abstract = {We present a freely available named-entity recognizer for Greek texts that identifies temporal expressions, person, and organization names. For temporal expressions, it relies on semi-automatically produced patterns. For person and organization names, it employs an ensemble of Support Vector Machines that scan the input text in two passes. The ensemble is trained using active learning, whereby the system itself proposes candidate training instances to be annotated by a human during training. The recognizer was evaluated on both a general collection of newspaper articles and a more focussed, in terms of topics, collection of financial articles.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present a freely available named-entity recognizer for Greek texts that identifies temporal expressions, person, and organization names. For temporal expressions, it relies on semi-automatically produced patterns. For person and organization names, it employs an ensemble of Support Vector Machines that scan the input text in two passes. The ensemble is trained using active learning, whereby the system itself proposes candidate training instances to be annotated by a human during training. The recognizer was evaluated on both a general collection of newspaper articles and a more focussed, in terms of topics, collection of financial articles. |
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. |
2003 |
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. |