Areas of interest

• Dependency treebanks
• POS tagging and syntactic parsing
• Language resource acquisition

CV data

Prokopis Prokopidis has been working as a computational linguist for the Natural Language and Knowledge Extraction Department of ILSP / R.C. "Athena" since 1998. In 1993, he graduated with a Degree in English Language and Literature from the University of Athens. In 1998, he received a MA in Computational Linguistics from the University of Essex. He has participated in several Greek and European applied R&D projects in the areas of natural language processing, multilingual information extraction and language resource acquisition (including Panacea, Abu-MaTran and ELRC). He has been involved in the development of manually annotated linguistic resources for Greek (including the Greek Dependency Treebank) and in the design and implementation of several tools for the automatic annotation of Greek documents at various levels of linguistic analysis. His work has been published in Greek and international conferences and books.

• Papavassiliou, V., Sofianopoulos, S., Prokopidis, P. & Piperidis, S. (2018). The ILSP/ARC submission to the WMT 2018 Parallel Corpus Filtering Shared Task. In Proceedings of the Third Conference on Machine Translation: Shared Task Papers, pages 928-933. Belgium, Brussels : Association for Computational Linguistics. [...] 
• Papavassiliou, V., Prokopidis, P. & Piperidis, S. (2018). Discovering Parallel Language Resources for Training MT Engines. In Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018). European Language Resources Association (ELRA). [...] 
• Prokopidis, P. & Papageorgiou, H. (2017). Universal Dependencies for Greek. In NoDaLiDa Workshop on Universal Dependencies. [...] 
• Antonio Toral, Miquel Esplá-Gomis, Filip Klubička, Nikola Ljubešić, Papavassiliou, V., Prokopidis, P. et al. (2017). Crawl and crowd to bring machine translation to under-resourced languages. Language Resources and Evaluation, 1–33. [...] 
• Papavassiliou, V., Prokopidis, P. & Piperidis, S. (2016). The ILSP/ARC submission to the WMT 2016 Bilingual Document Alignment Shared Task. In Proceedings of the First Conference on Machine Translation, pages 733-739. Berlin, Germany : Association for Computational Linguistics. [...] 
• Prokopidis, P., Papavassiliou, V. & Piperidis, S. (2016). Parallel Global Voices: a Collection of Multilingual Corpora with Citizen Media Stories. In Nicoletta Calzolari (Conference Chair) , Khalid Choukri , Thierry Declerck , Marko Grobelnik , Bente Maegaard , Joseph Mariani et al (editors), Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC 2016). European Language Resources Association (ELRA). [...] 
• Vassiliou, M., Georgaras, A., Prokopidis, P. & Papageorgiou, H. (2015). Co-referring or not co-referring? Answer the question!. In Proceedings of the 12th International Conference on Greek Linguistics, pages 1155-1170. Berlin: Edition Romiosini/CeMoG. [...] 
• Prokopidis, P., Stripelli, A. & Papageorgiou, H. (2015). MWEs and dependency parsing of Modern Greek. In Proceedings of the 12th International Conference on Greek Linguistics (ICGL 12). Berlin. [...] 
• Raphael Rubino, Tommi Pirinen, Miquel Esplà-Gomis, Nikola Ljubešić, Sergio Ortiz Rojas, Papavassiliou, V. et al. (2015). Abu-MaTran at WMT 2015 Translation Task: Morphological Segmentation and Web Crawling. In Proceedings of the Tenth Workshop on Statistical Machine Translation, pages 184–191. Lisbon, Portugal : Association for Computational Linguistics. [...] 
• Pecina, P., Toral, A., Papavassiliou, V., Prokopidis, P., Tamchyna, A., Way, A. et al. (2015). Domain adaptation of statistical machine translation with domain-focused web crawling. Language Resources and Evaluation, 49(11), 147-193. [...] 
• Antonio Toral, Tommi Pirinen, Andy Way, Raphaël Rubino, Gema Ramírez-Sánchez, Sergio Ortiz-Rojas et al. (2015). Automatic Acquisition of Machine Translation Resources in the Abu-MaTran Project. Procesamiento del Lenguaje Natural, 55, 185-188. [...] 
• Prokopidis, P., Bellos, A., Papageorgiou, H. & Markopoulos, G. (2014). Δεδομένα και πειράματα για την αυτόματη συντακτική ανάλυση ελληνικών κειμένων. In Proceedings of the 11th International conference on Greek Linguistics. Rhodes, Greece. [...] 
• Miquel Esplà-Gomis, Filip Klubička, Nikola Ljubešić, Sergio Ortiz-Rojas, Papavassiliou, V. & Prokopidis, P. (2014). Comparing Two Acquisition Systems for Automatically Building an English-Croatian Parallel Corpus from Multilingual Websites. In Proceedings of the Ninth International Conference on Language Resources and Evaluation. Reykjavik, Iceland. [...] 
• Prokopidis, P. & Papageorgiou, H. (2014). Experiments for Dependency Parsing of Greek. In Proceedings of the First Joint Workshop on Statistical Parsing of Morphologically Rich Languages and Syntactic Analysis of Non-Canonical Languages, pages 90-96. Dublin, Ireland. [...] 
• Papavassiliou, V., Prokopidis, P. & Gregor Thurmair. (2013). A modular open-source focused crawler for mining monolingual and bilingual corpora from the web. In Proceedings of the Sixth Workshop on Building and Using Comparable Corpora, pages 43-51. Sofia, Bulgaria : Association for Computational Linguistics. [...] 
• Pecina, P., Toral, A., Papavassiliou, V., Prokopidis, P. & Van Genabith, J. (2012). Domain Adaptation of Statistical Machine Translation using Web-Crawled Resources: A Case Study. In Proceedings of the 16th Annual Conference of the European Association for Machine Translation. Trento, Italy. [...] 
• Bel, N., Papavassiliou, V., Prokopidis, P., Toral, A., Victoria Arranz & Arranz, V. (2012). Mining and Exploiting Domain-Specific Corpora in the PANACEA Platform. In The Fifth Workshop on Building and Using Comparable Corpora. Istanbul, Turkey. [...] 
• Prokopidis, P., Georgantopoulos, B. & Papageorgiou, H. (2011). A suite of NLP tools for Greek. In The 10th International Conference of Greek Linguistics. Komotini, Greece. [...] 
• Kardiasmenos, A., Tsigka, S., Prokopidis, P. & Papageorgiou, H. (2011). Annotation of events in Greek corpora based on the model of TimeML. In Proceedings of the 10th International Conference of Greek Linguistics. Komotini, Greece. [...] 
• Pecina, P., Toral, A., Way, A., Prokopidis, P., Papavassiliou, V. & Giagkou, M. (2011). Towards Using Web-Crawled Data for Domain Adaptation in Statistical Machine Translation. In M.L. Forcada, H. Depraetere & V. Vadeghinste (editors), Proceedings of the 15th Annual conference of the European Association for Machine Translation, pages 297-304. Leuven, Belgium. [...] 
• Prokopidis, P., Desipri, E., Papageorgiou, H. & Markopoulos, G. (2009). TimeEL: Recognition of Temporal Expressions in Greek texts. In Proceedings of the 9th International Conference on Greek Linguistics. [...] 
• Giouli, V., Marzelou, E., Prokopidis, P. & Zourari, M. (2009). Language Technologies for Processing Greek textual Cultural Heritage data. In Proceedings of the 9th International Conference on Greek Linguistics. University of Chicago. [...] 
• Forner, P., Penas, A., Alegria, I., Forascu, C., Moreau, N., Osenova, P. et al (2009). Overview of the CLEF 2008 Multilingual Question Answering Track. In Carol Peters , Thomas Deselaers , Nicola Ferro , Julio Gonzalo , Gareth J. F. Jones , Mikko Kurimo et al (editors), Proceedings of the 9th Cross-language evaluation forum conference on Evaluating systems for multilingual and multimodal information access. Berlin, Heidelberg : Springer-Verlag. [...] 
• Prokopidis, P., Karra, V., Papagianopoulou, A. & Piperidis, S. (2008). Condensing Sentences for Subtitle Generation. In Khalid Choukri , Bente Maegaard , Joseph Mariani , Jan Odjik , Stelios Piperidis , Daniel Tapias et al (editors), Proceedings of the Sixth International Language Resources and Evaluation (LREC'08). Marrakech, Morocco. [...] 
• Papageorgiou, H., Prokopidis, P., Desipri, E., Koutsombogera, M. & Pouli, K. (2007). Language technologies for the retrieval of the semantic structure of events [in Greek]. In Proceedings of the 8th International Conference of Greek Linguistics, Ioannina, Greece. [...] 
• Ghotsoulia, V., Desipri, E., Koutsombogera, M., Prokopidis, P. & Papageorgiou, H. (2007). Towards a frame semantics resource for Greek. In Proceedings of the Sixth Workshop on Treebanks and Linguistic Theories (TLT 2007). Bergen, Norway. [...] 
• Piperidis, S., Demiros, I. & Prokopidis, P (2006). Infrastructure for a multilingual subtitle generation system. In Elo?na Miyares Berm?dez & Leonel Ruiz Miyares (editors), Linguistics in the Twenty First Century. Cambridge Scholars Press. [...] 
• Papageorgiou, H., Desipri, E., Koutsombogera, M., Pouli, K. & Prokopidis, P. (2006). Adding multi-layer Semantics to the Greek Dependency Treebank. In Proceedings of The Fifth International Conference on Language and Evaluation (LREC-2006). Genoa, Italy. [...] 
• Prokopidis, P., Desipri, E., Koutsombogera, M., Papageorgiou, H. & Piperidis, S. (2005). Theoretical and Practical Issues in the Construction of a Greek Dependency Treebank. In Montserrat Civit , S, Ra K?bler & Ma. Ant?nia Mart? (editors), Proceedings of The Fourth Workshop on Treebanks and Linguistic Theories (TLT 2005), pages 149-160. Barcelona, Spain. [...] 
• Desipri, E., Prokopidis, P., Koutsombogera, M. & Piperidis, S. (2005). Towards a Greek Dependency Corpus. In Stelios Piperidis & Elena Paskaleva (editors), Proceedings of the RANLP 2005 International Workshop on Language and Speech Infrastructure for Information Access in the Balkan Countries, pages 9-14. Borovets, Bulgaria. [...] 
• Papageorgiou, H., Prokopidis, P., Protopapas, A. & Carayannis, G (2005). Multimedia Indexing and Retrieval Using Natural Language, Speech and Image Processing Methods. In Giorgos Stamou & Stefanos Kollias (editors), Multimedia Content and the Semantic Web: Methods, Standards and Tools. Wiley. [...] 
• Piperidis, S., Demiros, I., Prokopidis, P., Vanroose, P., Hoethker, A., Daelemans, W. et al. (2004). Multimodal Multilingual Resources in the Subtitling Process. In Proceedings of the Fourth International Conference on Language Resources and Evaluation (LREC 2004), pages 205-208. Lisbon, Portugal. [...] 
• Piperidis, S., Demiros, I. & Prokopidis, P. (2004). Multimodal multilingual information processing for automatic subtitle generation: Resources, Methods and System Architecture. In Proceedings of the Workshop on E-Tools and Translation of the 5th International Languages and the Media Conference and Exhibition. Berlin, Germany. [...] 
• Papageorgiou, H., Prokopidis, P., Ρετάλης, Δ. & Μαρκογιάννης, Τ (2004). Αυτόματη παραγωγή κειμένου με χρήση ορολογικών δεδομένων: το έργο ΚΑΙΡΟΣ. In Mαριάννα Κατσογιάννου & Ελένη Ευθυμίου (editors), Ελληνική Ορολογία: Έρευνα και Εφαρμογές. Καστανιώτης. [...] 
• Papageorgiou, H., Prokopidis, P., Demiros, I., Hatzigeorgiu, N. & Carayannis, G. (2004). CIMWOS: A Multimedia Retrieval System based on Combined Text, Speech and Image Processing. In RIAO 2004 Conference Proceedings: Coupling approaches, coupling media and coupling languages for information retrieval, pages 38-51. University of Avignon (Vaucluse), France. [...] 
• Papageorgiou, H., Prokopidis, P., Giouli, V., Demiros, I., Konstantinidis, A. & Piperidis, S. (2003). Η χρήση της γλωσσικής τεχνολογίας στην επεξεργασία της Ελληνικής. In Πρακτικά του 6ου Διεθνούς Συνεδρίου Ελληνικής Γλωσσολογίας. Ρέθυμνο. [...] 
• Papageorgiou, H., Prokopidis, P., Demiros, I., Giouli, V., Konstantinidis, A. & Piperidis, S. (2002). Multi-level XML-based Corpus Annotation. In Proceedings of the 3nd Language Resources and Evaluation Conference. Las Palmas. [...] 
• Papageorgiou, H., Prokopidis, P., Giagkou, M. & Παπαθεοδώρου, Α. (2002). Recognition of Nominal and Verbal Groups Using Memory Based Techniques [in Greek]. In Proceedings of the 22nd Annual Meeting of the Department of Linguistics, pages 113-123. Θεσσαλονίκη : Aristotle University of Thessaloniki. [...] 
• Papageorgiou, H., Prokopidis, P., Malavazos, C., Triantafyllou, Y., Wagner, K., Piperidis, S. et al. (2001). Automatic Generation of Weather Forecasts: KAIROS project [in Greek]. In Proceedings of the 21st Meeting of the Department of Linguistics, pages 562-573. University of Thessaloniki. [...] 
• Papageorgiou, H., Prokopidis, P., Giouli, V. & Piperidis, S. (2000). A Unified POS Tagging Architecture and its Application to Greek. In Proceedings of the 2nd Language Resources and Evaluation Conference, pages 1455-1462. Athens. [...] 
• Boutsis, S., Prokopidis, P., Giouli, V. & Piperidis, S. (2000). A Robust Parser for Unrestricted Greek Text. In Proceedings of the 2nd Language Resources and Evaluation Conference, pages 467-474. Athens. [...] 
• Μπούτσης, Σ., Prokopidis, P., Giouli, V. & Piperidis, S. (2000). Shallow Parsing of Unrestricted Text [in Greek]. In Proceedings of the 21st Meeting of the Department of Linguistics, pages 502-513. [...] 
• Prokopidis, P. (1998). An HPSG Account of Modern Greek Relative Clauses. Master Thesis, University of Essex. [...]