Stelios Piperidis

Also published as: S. Piperidis, Stelios Piperdis


2021

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European Language Grid: A Joint Platform for the European Language Technology Community
Georg Rehm | Stelios Piperidis | Kalina Bontcheva | Jan Hajic | Victoria Arranz | Andrejs Vasiļjevs | Gerhard Backfried | Jose Manuel Gomez-Perez | Ulrich Germann | Rémi Calizzano | Nils Feldhus | Stefanie Hegele | Florian Kintzel | Katrin Marheinecke | Julian Moreno-Schneider | Dimitris Galanis | Penny Labropoulou | Miltos Deligiannis | Katerina Gkirtzou | Athanasia Kolovou | Dimitris Gkoumas | Leon Voukoutis | Ian Roberts | Jana Hamrlova | Dusan Varis | Lukas Kacena | Khalid Choukri | Valérie Mapelli | Mickaël Rigault | Julija Melnika | Miro Janosik | Katja Prinz | Andres Garcia-Silva | Cristian Berrio | Ondrej Klejch | Steve Renals
Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics: System Demonstrations

Europe is a multilingual society, in which dozens of languages are spoken. The only option to enable and to benefit from multilingualism is through Language Technologies (LT), i.e., Natural Language Processing and Speech Technologies. We describe the European Language Grid (ELG), which is targeted to evolve into the primary platform and marketplace for LT in Europe by providing one umbrella platform for the European LT landscape, including research and industry, enabling all stakeholders to upload, share and distribute their services, products and resources. At the end of our EU project, which will establish a legal entity in 2022, the ELG will provide access to approx. 1300 services for all European languages as well as thousands of data sets.

2020

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Proceedings of the 12th Language Resources and Evaluation Conference
Nicoletta Calzolari | Frédéric Béchet | Philippe Blache | Khalid Choukri | Christopher Cieri | Thierry Declerck | Sara Goggi | Hitoshi Isahara | Bente Maegaard | Joseph Mariani | Hélène Mazo | Asuncion Moreno | Jan Odijk | Stelios Piperidis
Proceedings of the 12th Language Resources and Evaluation Conference

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The European Language Technology Landscape in 2020: Language-Centric and Human-Centric AI for Cross-Cultural Communication in Multilingual Europe
Georg Rehm | Katrin Marheinecke | Stefanie Hegele | Stelios Piperidis | Kalina Bontcheva | Jan Hajič | Khalid Choukri | Andrejs Vasiļjevs | Gerhard Backfried | Christoph Prinz | José Manuel Gómez-Pérez | Luc Meertens | Paul Lukowicz | Josef van Genabith | Andrea Lösch | Philipp Slusallek | Morten Irgens | Patrick Gatellier | Joachim Köhler | Laure Le Bars | Dimitra Anastasiou | Albina Auksoriūtė | Núria Bel | António Branco | Gerhard Budin | Walter Daelemans | Koenraad De Smedt | Radovan Garabík | Maria Gavriilidou | Dagmar Gromann | Svetla Koeva | Simon Krek | Cvetana Krstev | Krister Lindén | Bernardo Magnini | Jan Odijk | Maciej Ogrodniczuk | Eiríkur Rögnvaldsson | Mike Rosner | Bolette Pedersen | Inguna Skadiņa | Marko Tadić | Dan Tufiș | Tamás Váradi | Kadri Vider | Andy Way | François Yvon
Proceedings of the 12th Language Resources and Evaluation Conference

Multilingualism is a cultural cornerstone of Europe and firmly anchored in the European treaties including full language equality. However, language barriers impacting business, cross-lingual and cross-cultural communication are still omnipresent. Language Technologies (LTs) are a powerful means to break down these barriers. While the last decade has seen various initiatives that created a multitude of approaches and technologies tailored to Europe’s specific needs, there is still an immense level of fragmentation. At the same time, AI has become an increasingly important concept in the European Information and Communication Technology area. For a few years now, AI – including many opportunities, synergies but also misconceptions – has been overshadowing every other topic. We present an overview of the European LT landscape, describing funding programmes, activities, actions and challenges in the different countries with regard to LT, including the current state of play in industry and the LT market. We present a brief overview of the main LT-related activities on the EU level in the last ten years and develop strategic guidance with regard to four key dimensions.

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European Language Grid: An Overview
Georg Rehm | Maria Berger | Ela Elsholz | Stefanie Hegele | Florian Kintzel | Katrin Marheinecke | Stelios Piperidis | Miltos Deligiannis | Dimitris Galanis | Katerina Gkirtzou | Penny Labropoulou | Kalina Bontcheva | David Jones | Ian Roberts | Jan Hajič | Jana Hamrlová | Lukáš Kačena | Khalid Choukri | Victoria Arranz | Andrejs Vasiļjevs | Orians Anvari | Andis Lagzdiņš | Jūlija Meļņika | Gerhard Backfried | Erinç Dikici | Miroslav Janosik | Katja Prinz | Christoph Prinz | Severin Stampler | Dorothea Thomas-Aniola | José Manuel Gómez-Pérez | Andres Garcia Silva | Christian Berrío | Ulrich Germann | Steve Renals | Ondrej Klejch
Proceedings of the 12th Language Resources and Evaluation Conference

With 24 official EU and many additional languages, multilingualism in Europe and an inclusive Digital Single Market can only be enabled through Language Technologies (LTs). European LT business is dominated by hundreds of SMEs and a few large players. Many are world-class, with technologies that outperform the global players. However, European LT business is also fragmented – by nation states, languages, verticals and sectors, significantly holding back its impact. The European Language Grid (ELG) project addresses this fragmentation by establishing the ELG as the primary platform for LT in Europe. The ELG is a scalable cloud platform, providing, in an easy-to-integrate way, access to hundreds of commercial and non-commercial LTs for all European languages, including running tools and services as well as data sets and resources. Once fully operational, it will enable the commercial and non-commercial European LT community to deposit and upload their technologies and data sets into the ELG, to deploy them through the grid, and to connect with other resources. The ELG will boost the Multilingual Digital Single Market towards a thriving European LT community, creating new jobs and opportunities. Furthermore, the ELG project organises two open calls for up to 20 pilot projects. It also sets up 32 national competence centres and the European LT Council for outreach and coordination purposes.

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Making Metadata Fit for Next Generation Language Technology Platforms: The Metadata Schema of the European Language Grid
Penny Labropoulou | Katerina Gkirtzou | Maria Gavriilidou | Miltos Deligiannis | Dimitris Galanis | Stelios Piperidis | Georg Rehm | Maria Berger | Valérie Mapelli | Michael Rigault | Victoria Arranz | Khalid Choukri | Gerhard Backfried | José Manuel Gómez-Pérez | Andres Garcia-Silva
Proceedings of the 12th Language Resources and Evaluation Conference

The current scientific and technological landscape is characterised by the increasing availability of data resources and processing tools and services. In this setting, metadata have emerged as a key factor facilitating management, sharing and usage of such digital assets. In this paper we present ELG-SHARE, a rich metadata schema catering for the description of Language Resources and Technologies (processing and generation services and tools, models, corpora, term lists, etc.), as well as related entities (e.g., organizations, projects, supporting documents, etc.). The schema powers the European Language Grid platform that aims to be the primary hub and marketplace for industry-relevant Language Technology in Europe. ELG-SHARE has been based on various metadata schemas, vocabularies, and ontologies, as well as related recommendations and guidelines.

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Proceedings of the 1st International Workshop on Language Technology Platforms
Georg Rehm | Kalina Bontcheva | Khalid Choukri | Jan Hajič | Stelios Piperidis | Andrejs Vasiļjevs
Proceedings of the 1st International Workshop on Language Technology Platforms

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CLARIN: Distributed Language Resources and Technology in a European Infrastructure
Maria Eskevich | Franciska de Jong | Alexander König | Darja Fišer | Dieter Van Uytvanck | Tero Aalto | Lars Borin | Olga Gerassimenko | Jan Hajic | Henk van den Heuvel | Neeme Kahusk | Krista Liin | Martin Matthiesen | Stelios Piperidis | Kadri Vider
Proceedings of the 1st International Workshop on Language Technology Platforms

CLARIN is a European Research Infrastructure providing access to digital language resources and tools from across Europe and beyond to researchers in the humanities and social sciences. This paper focuses on CLARIN as a platform for the sharing of language resources. It zooms in on the service offer for the aggregation of language repositories and the value proposition for a number of communities that benefit from the enhanced visibility of their data and services as a result of integration in CLARIN. The enhanced findability of language resources is serving the social sciences and humanities (SSH) community at large and supports research communities that aim to collaborate based on virtual collections for a specific domain. The paper also addresses the wider landscape of service platforms based on language technologies which has the potential of becoming a powerful set of interoperable facilities to a variety of communities of use.

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Towards an Interoperable Ecosystem of AI and LT Platforms: A Roadmap for the Implementation of Different Levels of Interoperability
Georg Rehm | Dimitris Galanis | Penny Labropoulou | Stelios Piperidis | Martin Welß | Ricardo Usbeck | Joachim Köhler | Miltos Deligiannis | Katerina Gkirtzou | Johannes Fischer | Christian Chiarcos | Nils Feldhus | Julian Moreno-Schneider | Florian Kintzel | Elena Montiel | Víctor Rodríguez Doncel | John Philip McCrae | David Laqua | Irina Patricia Theile | Christian Dittmar | Kalina Bontcheva | Ian Roberts | Andrejs Vasiļjevs | Andis Lagzdiņš
Proceedings of the 1st International Workshop on Language Technology Platforms

With regard to the wider area of AI/LT platform interoperability, we concentrate on two core aspects: (1) cross-platform search and discovery of resources and services; (2) composition of cross-platform service workflows. We devise five different levels (of increasing complexity) of platform interoperability that we suggest to implement in a wider federation of AI/LT platforms. We illustrate the approach using the five emerging AI/LT platforms AI4EU, ELG, Lynx, QURATOR and SPEAKER.

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Verbal Aggression as an Indicator of Xenophobic Attitudes in Greek Twitter during and after the Financial Crisis
Maria Pontiki | Maria Gavriilidou | Dimitris Gkoumas | Stelios Piperidis
Proceedings of the Workshop about Language Resources for the SSH Cloud

We present a replication of a data-driven and linguistically inspired Verbal Aggression analysis framework that was designed to examine Twitter verbal attacks against predefined target groups of interest as an indicator of xenophobic attitudes during the financial crisis in Greece, in particular during the period 2013-2016. The research goal in this paper is to re-examine Verbal Aggression as an indicator of xenophobic attitudes in Greek Twitter three years later, in order to trace possible changes regarding the main targets, the types and the content of the verbal attacks against the same targets in the post crisis era, given also the ongoing refugee crisis and the political landscape in Greece as it was shaped after the elections in 2019. The results indicate an interesting rearrangement of the main targets of the verbal attacks, while the content and the types of the attacks provide valuable insights about the way these targets are being framed as compared to the respective dominant perceptions and stereotypes about them during the period 2013-2016.

2018

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The ILSP/ARC submission to the WMT 2018 Parallel Corpus Filtering Shared Task
Vassilis Papavassiliou | Sokratis Sofianopoulos | Prokopis Prokopidis | Stelios Piperidis
Proceedings of the Third Conference on Machine Translation: Shared Task Papers

This paper describes the submission of the Institute for Language and Speech Processing/Athena Research and Innovation Center (ILSP/ARC) for the WMT 2018 Parallel Corpus Filtering shared task. We explore several properties of sentences and sentence pairs that our system explored in the context of the task with the purpose of clustering sentence pairs according to their appropriateness in training MT systems. We also discuss alternative methods for ranking the sentence pairs of the most appropriate clusters with the aim of generating the two datasets (of 10 and 100 million words as required in the task) that were evaluated. By summarizing the results of several experiments that were carried out by the organizers during the evaluation phase, our submission achieved an average BLEU score of 26.41, even though it does not make use of any language-specific resources like bilingual lexica, monolingual corpora, or MT output, while the average score of the best participant system was 27.91.

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Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018)
Nicoletta Calzolari | Khalid Choukri | Christopher Cieri | Thierry Declerck | Sara Goggi | Koiti Hasida | Hitoshi Isahara | Bente Maegaard | Joseph Mariani | Hélène Mazo | Asuncion Moreno | Jan Odijk | Stelios Piperidis | Takenobu Tokunaga
Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018)

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Managing Public Sector Data for Multilingual Applications Development
Stelios Piperidis | Penny Labropoulou | Miltos Deligiannis | Maria Giagkou
Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018)

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European Language Resource Coordination: Collecting Language Resources for Public Sector Multilingual Information Management
Andrea Lösch | Valérie Mapelli | Stelios Piperidis | Andrejs Vasiļjevs | Lilli Smal | Thierry Declerck | Eileen Schnur | Khalid Choukri | Josef van Genabith
Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018)

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Discovering Parallel Language Resources for Training MT Engines
Vassilis Papavassiliou | Prokopis Prokopidis | Stelios Piperidis
Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018)

2016

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The ILSP/ARC submission to the WMT 2016 Bilingual Document Alignment Shared Task
Vassilis Papavassiliou | Prokopis Prokopidis | Stelios Piperidis
Proceedings of the First Conference on Machine Translation: Volume 2, Shared Task Papers

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Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC'16)
Nicoletta Calzolari | Khalid Choukri | Thierry Declerck | Sara Goggi | Marko Grobelnik | Bente Maegaard | Joseph Mariani | Helene Mazo | Asuncion Moreno | Jan Odijk | Stelios Piperidis
Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC'16)

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Parallel Global Voices: a Collection of Multilingual Corpora with Citizen Media Stories
Prokopis Prokopidis | Vassilis Papavassiliou | Stelios Piperidis
Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC'16)

We present a new collection of multilingual corpora automatically created from the content available in the Global Voices websites, where volunteers have been posting and translating citizen media stories since 2004. We describe how we crawled and processed this content to generate parallel resources comprising 302.6K document pairs and 8.36M segment alignments in 756 language pairs. For some language pairs, the segment alignments in this resource are the first open examples of their kind. In an initial use of this resource, we discuss how a set of document pair detection algorithms performs on the Greek-English corpus.

2015

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A Data Sharing and Annotation Service Infrastructure
Stelios Piperidis | Dimitrios Galanis | Juli Bakagianni | Sokratis Sofianopoulos
Proceedings of ACL-IJCNLP 2015 System Demonstrations

2014

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Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)
Nicoletta Calzolari | Khalid Choukri | Thierry Declerck | Hrafn Loftsson | Bente Maegaard | Joseph Mariani | Asuncion Moreno | Jan Odijk | Stelios Piperidis
Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)

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The Strategic Impact of META-NET on the Regional, National and International Level
Georg Rehm | Hans Uszkoreit | Sophia Ananiadou | Núria Bel | Audronė Bielevičienė | Lars Borin | António Branco | Gerhard Budin | Nicoletta Calzolari | Walter Daelemans | Radovan Garabík | Marko Grobelnik | Carmen García-Mateo | Josef van Genabith | Jan Hajič | Inma Hernáez | John Judge | Svetla Koeva | Simon Krek | Cvetana Krstev | Krister Lindén | Bernardo Magnini | Joseph Mariani | John McNaught | Maite Melero | Monica Monachini | Asunción Moreno | Jan Odijk | Maciej Ogrodniczuk | Piotr Pęzik | Stelios Piperidis | Adam Przepiórkowski | Eiríkur Rögnvaldsson | Michael Rosner | Bolette Pedersen | Inguna Skadiņa | Koenraad De Smedt | Marko Tadić | Paul Thompson | Dan Tufiş | Tamás Váradi | Andrejs Vasiļjevs | Kadri Vider | Jolanta Zabarskaite
Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)

This article provides an overview of the dissemination work carried out in META-NET from 2010 until early 2014; we describe its impact on the regional, national and international level, mainly with regard to politics and the situation of funding for LT topics. This paper documents the initiative’s work throughout Europe in order to boost progress and innovation in our field.

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META-SHARE: One year after
Stelios Piperidis | Harris Papageorgiou | Christian Spurk | Georg Rehm | Khalid Choukri | Olivier Hamon | Nicoletta Calzolari | Riccardo del Gratta | Bernardo Magnini | Christian Girardi
Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)

This paper presents META-SHARE (www.meta-share.eu), an open language resource infrastructure, and its usage since its Europe-wide deployment in early 2013. META-SHARE is a network of repositories that store language resources (data, tools and processing services) documented with high-quality metadata, aggregated in central inventories allowing for uniform search and access. META-SHARE was developed by META-NET (www.meta-net.eu) and aims to serve as an important component of a language technology marketplace for researchers, developers, professionals and industrial players, catering for the full development cycle of language technology, from research through to innovative products and services. The observed usage in its initial steps, the steadily increasing number of network nodes, resources, users, queries, views and downloads are all encouraging and considered as supportive of the choices made so far. In tandem, take-up activities like direct linking and processing of datasets by language processing services as well as metadata transformation to RDF are expected to open new avenues for data and resources linking and boost the organic growth of the infrastructure while facilitating language technology deployment by much wider research communities and industrial sectors.

2013

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QTLaunchpad
Stephen Doherty | Declan Groves | Josef van Genabith | Arle Lommel | Aljoscha Burchardt | Hans Uszkoreit | Lucia Specia | Stelios Piperidis
Proceedings of Machine Translation Summit XIV: European projects

2012

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Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12)
Nicoletta Calzolari | Khalid Choukri | Thierry Declerck | Mehmet Uğur Doğan | Bente Maegaard | Joseph Mariani | Asuncion Moreno | Jan Odijk | Stelios Piperidis
Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12)

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The FLaReNet Strategic Language Resource Agenda
Claudia Soria | Núria Bel | Khalid Choukri | Joseph Mariani | Monica Monachini | Jan Odijk | Stelios Piperidis | Valeria Quochi | Nicoletta Calzolari
Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12)

The FLaReNet Strategic Agenda highlights the most pressing needs for the sector of Language Resources and Technologies and presents a set of recommendations for its development and progress in Europe, as issued from a three-year consultation of the FLaReNet European project. The FLaReNet recommendations are organised around nine dimensions: a) documentation b) interoperability c) availability, sharing and distribution d) coverage, quality and adequacy e) sustainability f) recognition g) development h) infrastructure and i) international cooperation. As such, they cover a broad range of topics and activities, spanning over production and use of language resources, licensing, maintenance and preservation issues, infrastructures for language resources, resource identification and sharing, evaluation and validation, interoperability and policy issues. The intended recipients belong to a large set of players and stakeholders in Language Resources and Technology, ranging from individuals to research and education institutions, to policy-makers, funding agencies, SMEs and large companies, service and media providers. The main goal of these recommendations is to serve as an instrument to support stakeholders in planning for and addressing the urgencies of the Language Resources and Technologies of the future.

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The META-SHARE Metadata Schema for the Description of Language Resources
Maria Gavrilidou | Penny Labropoulou | Elina Desipri | Stelios Piperidis | Haris Papageorgiou | Monica Monachini | Francesca Frontini | Thierry Declerck | Gil Francopoulo | Victoria Arranz | Valerie Mapelli
Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12)

This paper presents a metadata model for the description of language resources proposed in the framework of the META-SHARE infrastructure, aiming to cover both datasets and tools/technologies used for their processing. It places the model in the overall framework of metadata models, describes the basic principles and features of the model, elaborates on the distinction between minimal and maximal versions thereof, briefly presents the integrated environment supporting the LRs description and search and retrieval processes and concludes with work to be done in the future for the improvement of the model.

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The META-SHARE Language Resources Sharing Infrastructure: Principles, Challenges, Solutions
Stelios Piperidis
Proceedings of the Eighth International Conference on Language Resources and Evaluation (LREC'12)

Language resources have become a key factor in the development cycle of language technology. The current prevailing methodologies, the sheer number of languages and the vast volumes of digital content together with the wide palette of useful content processing applications, render new models for managing the underlying language resources indispensable. This paper presents META-SHARE, an open resource exchange infrastructure, which aims to boost visibility, documentation, identification, openness and sharing, collaboration, preservation and interoperability of language data and basic language processing tools. META-SHARE is implemented as a network of distributed repositories of language resources. It offers providers and consumers of resources the necessary functionalities for describing, storing, searching, licensing and downloading language resources in a single integrated technical platform. META-SHARE favours and aligns itself with the growing open data and open source tools movement. To this end, it has prepared the necessary underlying legal framework consisting of a Charter for language resource sharing, as well as a set of licensing templates aiming to act as recommended licence models in an attempt to facilitate the legal interoperability of language resources. In its current version, META-SHARE features 13 resource repositories, with over 1200 resource packages.

2011

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Proceedings of the Workshop on Language Resources, Technology and Services in the Sharing Paradigm
Nicoletta Calzolari | Toru Ishida | Stelios Piperidis | Virach Sornlertlamvanich
Proceedings of the Workshop on Language Resources, Technology and Services in the Sharing Paradigm

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A Metadata Schema for the Description of Language Resources (LRs)
Maria Gavrilidou | Penny Labropoulou | Stelios Piperidis | Monica Monachini | Francesca Frontini | Gil Francopoulo | Victoria Arranz | Valérie Mapelli
Proceedings of the Workshop on Language Resources, Technology and Services in the Sharing Paradigm

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Proceedings of the Workshop on Language Technologies for Digital Humanities and Cultural Heritage
Cristina Vertan | Milena Slavcheva | Petya Osenova | Stelios Piperidis
Proceedings of the Workshop on Language Technologies for Digital Humanities and Cultural Heritage

2010

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Proceedings of the Seventh International Conference on Language Resources and Evaluation (LREC'10)
Nicoletta Calzolari | Khalid Choukri | Bente Maegaard | Joseph Mariani | Jan Odijk | Stelios Piperidis | Mike Rosner | Daniel Tapias
Proceedings of the Seventh International Conference on Language Resources and Evaluation (LREC'10)

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The LREC Map of Language Resources and Technologies
Nicoletta Calzolari | Claudia Soria | Riccardo Del Gratta | Sara Goggi | Valeria Quochi | Irene Russo | Khalid Choukri | Joseph Mariani | Stelios Piperidis
Proceedings of the Seventh International Conference on Language Resources and Evaluation (LREC'10)

In this paper we present the LREC Map of Language Resources and Tools, an innovative feature introduced with this LREC. The purpose of the Map is to shed light on the vast amount of resources and tools that represent the background of the research presented at LREC, in the attempt to fill in a gap in the community knowledge about the resources and tools that are used or created worldwide. It also aims at a change of culture in the field, actively engaging each researcher in the documentation task about resources. The Map has been developed on the basis of the information provided by LREC authors during the submission of papers to the LREC 2010 conference and the LREC workshops, and contains information about almost 2000 resources. The paper illustrates the motivation behind this initiative, its main characteristics, its relevance and future impact in the field, the metadata used to describe the resources, and finally presents some of the most relevant findings.

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Resource and Service Centres as the Backbone for a Sustainable Service Infrastructure
Peter Wittenburg | Nuria Bel | Lars Borin | Gerhard Budin | Nicoletta Calzolari | Eva Hajicova | Kimmo Koskenniemi | Lothar Lemnitzer | Bente Maegaard | Maciej Piasecki | Jean-Marie Pierrel | Stelios Piperidis | Inguna Skadina | Dan Tufis | Remco van Veenendaal | Tamas Váradi | Martin Wynne
Proceedings of the Seventh International Conference on Language Resources and Evaluation (LREC'10)

Currently, research infrastructures are being designed and established in many disciplines since they all suffer from an enormous fragmentation of their resources and tools. In the domain of language resources and tools the CLARIN initiative has been funded since 2008 to overcome many of the integration and interoperability hurdles. CLARIN can build on knowledge and work from many projects that were carried out during the last years and wants to build stable and robust services that can be used by researchers. Here service centres will play an important role that have the potential of being persistent and that adhere to criteria as they have been established by CLARIN. In the last year of the so-called preparatory phase these centres are currently developing four use cases that can demonstrate how the various pillars CLARIN has been working on can be integrated. All four use cases fulfil the criteria of being cross-national.

2009

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Machine Translation and its Philosophical Accounts
Stelios Piperidis
Proceedings of the EACL 2009 Workshop on the Interaction between Linguistics and Computational Linguistics: Virtuous, Vicious or Vacuous?

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Proceedings of the Workshop Multilingual resources, technologies and evaluation for central and Eastern European languages
Elena Paskaleva | Stelios Piperidis | Milena Slavcheva | Cristina Vertan
Proceedings of the Workshop Multilingual resources, technologies and evaluation for central and Eastern European languages

2008

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Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)
Nicoletta Calzolari | Khalid Choukri | Bente Maegaard | Joseph Mariani | Jan Odijk | Stelios Piperidis | Daniel Tapias
Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)

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Condensing Sentences for Subtitle Generation
Prokopis Prokopidis | Vassia Karra | Aggeliki Papagianopoulou | Stelios Piperidis
Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)

Text condensation aims at shortening the length of an utterance without losing essential textual information. In this paper, we report on the implementation and preliminary evaluation of a sentence condensation tool for Greek using a manually constructed table of 450 lexical paraphrases, and a set of rules that delete syntactic subtrees that carry minor semantic information. Evaluation on two-sentence sets show promising results regarding grammaticality and semantic acceptability of compressed versions.

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Foundation of a Component-based Flexible Registry for Language Resources and Technology
Daan Broeder | Thierry Declerck | Erhard Hinrichs | Stelios Piperidis | Laurent Romary | Nicoletta Calzolari | Peter Wittenburg
Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)

Within the CLARIN e-science infrastructure project it is foreseen to develop a component-based registry for metadata for Language Resources and Language Technology. With this registry it is hoped to overcome the problems of the current available systems with respect to inflexible fixed schema, unsuitable terminology and interoperability problems. The registry will address interoperability needs by refering to a shared vocabulary registered in data category registries as they are suggested by ISO.

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Building a Greek corpus for Textual Entailment
Evi Marzelou | Maria Zourari | Voula Giouli | Stelios Piperidis
Proceedings of the Sixth International Conference on Language Resources and Evaluation (LREC'08)

The paper reports on completed work aimed at the creation of a resource, namely, the Greek Textual Entailment Corpus (GTEC) that is appropriate for guiding training and evaluation of a system that recognizes Textual Entailment in Greek texts. The corpus of textual units was collected in view of a range of NLP applications, where semantic interpretation is of paramount importance, and it was manually annotated at the level of Textual Entailment. Moreover, a number of linguistic annotations were also integrated that were deemed useful for prospect system developers. The critical issue was the development of a final resource that is re-usable and adaptable to different NLP systems, in order to either enhance their accuracy or to evaluate their output. We are hereby focusing on the methodological issues underpinning data selection and annotation. An initial approach towards the development of a system catering for the automatic Recognition of Textual Entailment in Greek is also presented and preliminary results are reported.

2006

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Language Resources Production Models: the Case of the INTERA Multilingual Corpus and Terminology
Maria Gavrilidou | Penny Labropoulou | Stelios Piperidis | Voula Giouli | Nicoletta Calzolari | Monica Monachini | Claudia Soria | Khalid Choukri
Proceedings of the Fifth International Conference on Language Resources and Evaluation (LREC’06)

This paper reports on the multilingual Language Resources (MLRs), i.e. parallel corpora and terminological lexicons for less widely digitally available languages, that have been developed in the INTERA project and the methodology adopted for their production. Special emphasis is given to the reality factors that have influenced the MLRs development approach and their final constitution. Building on the experience gained in the project, a production model has been elaborated, suggesting ways and techniques that can be exploited in order to improve LRs production taking into account realistic issues.

2004

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ENABLER Thematic Network of National Projects: Technical, Strategic and Political Issues of LRs
Nicoletta Calzolari | Khalid Choukri | Maria Gavrilidou | Bente Maegaard | Paola Baroni | Hanne Fersøe | Alessandro Lenci | Valérie Mapelli | Monica Monachini | Stelios Piperidis
Proceedings of the Fourth International Conference on Language Resources and Evaluation (LREC’04)

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Multimodal, Multilingual Resources in the Subtitling Process
Stelios Piperidis | Iason Demiros | Prokopis Prokopidis | Peter Vanroose | Anja Hoethker | Walter Daelemans | Elsa Sklavounou | Manos Konstantinou | Yannis Karavidas
Proceedings of the Fourth International Conference on Language Resources and Evaluation (LREC’04)

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Building Parallel Corpora for eContent Professionals
M. Gavrilidou | P. Labropoulou | E. Desipri | V. Giouli | V. Antonopoulos | S. Piperidis
Proceedings of the Workshop on Multilingual Linguistic Resources

2002

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Multi-level XML-based Corpus Annotation
Harris Papageorgiou | Prokopis Prokopidis | Voula Giouli | Iason Demiros | Alexis Konstantinidis | Stelios Piperidis
Proceedings of the Third International Conference on Language Resources and Evaluation (LREC’02)

2000

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Proceedings of the Second International Conference on Language Resources and Evaluation (LREC’00)
M. Gavrilidou | G. Carayannis | S. Markantonatou | S. Piperidis | G. Stainhauer
Proceedings of the Second International Conference on Language Resources and Evaluation (LREC’00)

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Term-based Identification of Sentences for Text Summarisation
Byron Georgantopoulos | Stelios Piperidis
Proceedings of the Second International Conference on Language Resources and Evaluation (LREC’00)

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Named Entity Recognition in Greek Texts
Iason Demiros | Sotiris Boutsis | Voula Giouli | Maria Liakata | Harris Papageorgiou | Stelios Piperidis
Proceedings of the Second International Conference on Language Resources and Evaluation (LREC’00)

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A Robust Parser for Unrestricted Greek Text
Sotiris Boutsis | Prokopis Prokopidis | Voula Giouli | Stelios Piperidis
Proceedings of the Second International Conference on Language Resources and Evaluation (LREC’00)

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A Unified POS Tagging Architecture and its Application to Greek
Harris Papageorgiou | Prokopis Prokopidis | Voula Giouli | Stelios Piperidis
Proceedings of the Second International Conference on Language Resources and Evaluation (LREC’00)

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Design and Implementation of the Online ILSP Greek Corpus
Nick Hatzigeorgiu | Maria Gavrilidou | Stelios Piperidis | George Carayannis | Anastasia Papakostopoulou | Athanassia Spiliotopoulou | Anna Vacalopoulou | Penny Labropoulou | Elena Mantzari | Harris Papageorgiou | Iason Demiros
Proceedings of the Second International Conference on Language Resources and Evaluation (LREC’00)

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Application of Analogical Modelling to Example Based Machine Translation
Christos Malavazosi | Stelios Piperidis
COLING 2000 Volume 1: The 18th International Conference on Computational Linguistics

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Towards memory and template-based translation synthesis
Christos Malavazos | Stelios Piperidis | George Carayannis
Proceedings of the International Conference on Machine Translation and Multilingual Applications in the new Millennium: MT 2000

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An alignment architecture for translation memory bootstrapping
Ioannis Triantafyllou | Iason Demiros | Christos Malavazos | Stelios Piperidis
Proceedings of the International Conference on Machine Translation and Multilingual Applications in the new Millennium: MT 2000

1999

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A Multi-level Framework for Memory-Based Translation Aid Tools
Stelios Piperidis | Christos Malavazos | Ioannis Triantafyllou
Proceedings of Translating and the Computer 21

1998

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Aligning Clattses in Parallel Texts
Sotiris Boutsis | Stelios Piperidis
Proceedings of the Third Conference on Empirical Methods for Natural Language Processing

1994

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A Matching Technique in Example-Based Machine Translation
Lambros Cranias | Harris Papageorgiou | Stelios Piperdis
COLING 1994 Volume 1: The 15th International Conference on Computational Linguistics

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Interactive Corpus-based Translation Learning Tool (Translearn)
Stelios Piperidis
Proceedings of Translating and the Computer 16

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Automatic Alignment in Parallel Corpora
Harris Papageorgiou | Lambros Cranias | Stelios Piperidis
32nd Annual Meeting of the Association for Computational Linguistics

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