Dan Ştefănescu

Academic Background	nov. 2004-, Research Institute for Artificial Intelligence, Romanian Academy, Bucharest, Romania Ph.D. student, thesis: Information Retrieval / Extraction from Multilingual Corpora 2002-2004, Faculty of Computer Science, "Al. I. Cuza" University, Iasi, Romania M.Sc. in Computational Linguistics, dissertation: Automatic Recognition of Protein Names in Biomedical Texts 1998-2002, Faculty of Computer Science, "Al. I. Cuza" University, Iasi, Romania B.Sc. thesis: Searching the World Wide Web using Natural Language Query

Work Experience	Research Institute for Artificial Intelligence , Romanian Academy, Bucharest, Romania nov. 2007 - now - Researcher oct. 2004 - nov. 2007 - Assistant Researcher - member of the Natural Language Processing Group.

Languages	Romanian (native), English (fluent), French (some)

Publications / Scholar Activities	Articles in Conference proceedings, Journals and Magazines 2009 Radu ION, Dan Ştefănescu, Unsupervised Word Sense Disambiguation with Lexical Chains and Graph-based Context Formalization, in Proceedings of the 4th Language & Technology Conference, 6-8 Nov., Poznan, Poland, 2009 Verginica Barbu Mititelu, Alexandru Ceauşu, Radu Ion, Elena Irimia, Dan Ştefănescu, Dan Tufiş, Linguistic Resources for a Romanian QA System, in Revista Română de Interacţiune Om-Calculator 2, pp. 1-17, Bucharest, Romania, 2009 Radu Ion, Dan Ştefănescu, Alexandru Ceauşu, Dan Tufiş, Elena Irimia, Verginica Barbu-Mititelu, A Trainable Multi-factored QA System, in Proceedings of CLEF2009 Workshop, 30 Sept.-2 Oct., Corfu, Greece, 2009 Amalia Todiraşcu, Christopher Gledhill, Dan Ştefănescu, Extracting Collocations in Contexts, in Human Language Technology. Challenges of the Information Society, Lecture Notes in Computer Science Series, Springer Berlin / Heidelberg. ISSN: 0302-9743 (Print) 1611-3349 (Online), Volume 5603/2009, pp. 336-349, 2009. ISBN 978-3-642-04234-8 Dan Ştefănescu, Dan Tufiş, CONAN - Detecting the possible connotations of a text, in Diana Trandabăţ, Dan Cristea, Dan Tufiş (eds.) 4th Romanian Workshop for Linguistic Tools and Resources Volume, pp. 141-150, Iaşi, Romania, 2009 (ro) 2008 Radu Ion, Dan Ştefănescu, Alexandru Ceauşu, Important Practical Aspects of an Open-domain QA System Prototyping, Proceedings of the Romanian Academy, Series A, 6 p., The Publishing House of the Romanian Academy, 2008, Bucharest, Romania Dan Tufiş, Dan Ştefănescu, Radu Ion, Alexandru Ceauşu, RACAI's Question Answering System at QA@CLEF 2007, in Carol Peters et al.(eds.), Advances in Multilingual and Multimodal Information Retrieval (CLEF 2007), volume 5152 of Lecture Notes in Computer Science, pp. 3284-3291, Springer-Verlag, Sep. 2008, ISBN 978-3-540-85759-4 Radu Ion, Dan Ştefănescu, Alexandru Ceauşu, Dan Tufiş, RACAI's QA System at the Romanian-Romanian Multiple Language Question Answering (QA@CLEF2008) Main Task, in Alessandro Nardi and Carol Peters (eds.), Working Notes for the CLEF 2008 Workshop, 10p., Sep. 2008, Aarhus, Denmark Amalia Todiraşcu, Ulrich Heid, Dan Ştefănescu, Dan Tufiş, Christopher Gledhill, Marion Weller, Francois Rousselot, Vers un dictionnaire de collocations multilingue, in Cahier de Linguistique, 33/1, August 2008, pp. 161-186, Louvain. ISSN 0771-6524 (fr) Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, ROTEL: Linguistic Web Services, in Proceedings of the Excellence Research – A Way to Innovation (CEEX 2008), pp. 29-1 – 29-6, 2008, Braşov, Romania Amalia Todiraşcu, Dan Tufiş, Ulrich Heid, Christopher Gledhill, Dan Ştefănescu, Marion Weller, François Rousselot, A Mix Approach to Extracting and Classifying Verb+Noun Constructions, in Proceedings of The 6th Language Resources and Evaluation Conference - LREC 2008, 28-30 May, Marrakech, Morocco Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, RACAI's Linguistic Web Services, in Proceedings of The 6th Language Resources and Evaluation Conference - LREC 2008, 28-30 May, Marrakech, Morocco Dan Ştefănescu, Alexandru Ceauşu, Radu Ion, Amalia Todiraşcu, Ulrich Heid, Christopher Gledhill, François Rousselot, Extraction de collocations monolingues et bilingues: application a la traduction, The Latin Union Conference, 28-29 Feb. 2008, Bucharest, Romania (fr). ISBN 978-9-291220-37-3 Dan Tufiş, Radu Ion, Luigi Bozianu, Alexandru Ceauşu, Dan Ştefănescu, Romanian Wordnet: Current State, New Applications and Prospects, in Attila Tanacs, Dora Csendes, Veronika Vincze, Christiane Fellbaum, and Piek Vossen (eds.), 4th Global WordNet Conference, GWC-2008, pp. 441-452, January 2008, Szeged, Hungary. University of Szeged, Hungary. ISBN 978-963-482-854-9 2007 Amalia Todiraşcu, Christopher Gledhill, Dan Ştefănescu, Extracting Collocations in Context, in Proceedings of 3rd Language & Technology Conference, 5-7 Oct. 2007, Poznan, Poland Amalia Todiraşcu, Christopher Gledhill, Dan Ştefănescu, Extracting Collocations in Context: the case of Romanian VN constructions, in Proceedings of RANLP 2007, 27-29 Sep., Borovets, Bulgaria Dan Tufiş, Dan Ştefănescu, Radu Ion, Alexandru Ceauşu, RACAI's Question Answering System at QA@CLEF 2007, in Proceedings of CLEF2007 Workshop, 19-21 Sep., Budapest, Hungary 2006 Dan Ştefănescu, Dan Tufiş, Elena Irimia, Automatic Identification and Extraction of Collocations from Texts, in The 2nd Romanian Workshop for Linguistic Tools and Resources Volume, 3 Nov. 2006, Bucharest, Romania (ro) Georgiana Puşcaşu, Adrian Iftene, Ionuţ Pistol, Diana Trandabăţ, Dan Tufiş, Alexandru Ceauşu, Dan Ştefănescu, Radu Ion, Constantin Orăşan, Iustin Dornescu, Alex Moruz, Dan Cristea, Developing a Question Answering System for the Romanian-English Track at CLEF 2006, in Proceedings of CLEF 2006 Workshop, 20-22 Sep., Alicante, Spain Dan Ştefănescu, Dan Tufiş, Aligning Multilingual Thesauri, in Proceedings of The 5th Language Resources and Evaluation Conference - LREC 2006, 22-28 May, Genoa, Italy Alexandru Ceauşu, Dan Ştefănescu, Dan Tufiş, Acquis Communautaire Sentence Alignment using Support Vector Machines, in Proceedings of The 5th Language Resources and Evaluation Conference - LREC 2006, 22-28 May, Genoa, Italy Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, Improved Lexical Alignment by Combining Multiple Reified Alignments, in Proceedings of EACL 2006, 3-7 Apr., Trento, Italy 2005 Dan Tufiş, Alexandru Ceauşu, Radu Ion, Dan Ştefănescu, An integrated platform for high-accuracy word alignment, in Proceedings of JRC Enlargement and Integration Workshop: Exploiting parallel corpora in up to 20 languages, 26-27 Sep. 2005, Arona, Italy Dan Tufiş, Radu Ion, Dan Ştefănescu, Alexandru Ceauşu, Word Senses and Cross-lingual Word Sense Disambiguation, in Proceedings of EUROLAN 2005, 25 July - 6 Aug., Cluj, Romania Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, Combining Word Alignments, in Proceedings of ACL 2005 Workshop on "Building and Using Parallel Corpora: Data-driven Machine Translation and Beyond", 29-30 June, Ann Arbor, Michigan, USA Others Amalia Todiraşcu, Dan Ştefănescu, Christopher Gledhill, An Application for Collocation Extraction, in The 3rd Romanian Workshop for Linguistic Tools and Resources Volume, Romania, 2007 (ro) Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, RACAI's Linguistic Web Services, in The 3rd Romanian Workshop for Linguistic Tools and Resources Volume, Romania, 2007 (ro) Cristina Niculescu, Cornel Lepadatu, Dan Ştefănescu, SSCBI - A Teleworking Environment of Support Systems for Knowledge Culture, in Proceedings of REV 2007, Portugal Dan Ştefănescu, Aligning Unequal Multilingual Thesauri, in Proceedings of CESCL 2006, Hungary Dan Tufiş, Radu Ion, Elena Irimia, Verginica Barbu Mititelu, Alexandru Ceauşu, Dan Ştefănescu, Luigi Bozianu, Catalin Mihaila, Resources, Tools and Algorithms for the Semantic Web, in Proceedings of IST - Multidisciplinary approaches, Romania, 2006 Alexandru Ceauşu, Dan Tufiş, Dan Ştefănescu, Sentence and word alignment using Support Vector Machines, in Proceedings of IST - Multidisciplinary approaches, Romania, 2006 Gheorghe Ionesei, Dan Ştefănescu, Irving Fisher's Real Rate of Interest versus Geanakopolos' Riskless Asset, Observer Journal, Romanian Academy, 2005, Romania

Awards Received	1st place (as member of RACAI team) - Question-Answering System for JRC-Acquis track, CLEF 2009 1st place (as member of RACAI team) - Question-Answering System for Ro-Ro Wiki track, CLEF 2007 1st place (as member of RACAI team) - Lexical Unit Alignment Competition for English-Romanian pair of languages, ACL 2005, USA 3rd place - regional phase (Romania and Republic of Moldova) of the Microsoft Imagine Cup 2005 2nd place - EconomMIX Communication Session Contest, FEAA, Univ. "Al. I. Cuza", Iasi, Romania, 2003

Interests	Programming Procedural programming (Visual Studio.NET C#, Java) Scripting programming (Active Perl) Annotation languages (XML, XSL) Natural Language Processing Statistical Information Retrieval / Extraction from Mono / Multi - lingual Corpora Statistical Models Question Answering Sentence and Word Alignment Statistical Machine Translation Data Mining Data pre / post - processing Data Classification Others Genetic Algorithms Swarm Intelligence Algorithms AI behavior in Computer Games Optimization Solutions Speaker Verification and Identification Speech Recognition

Applications developed	WSD using Lexical Chains (C# - under construction) Lexical Chains Finder (C#) Lexical Dependecies Editor (C#) QA System for Romanian (C# - constantly under construction) Maximum Entropy Question Classifier (C#) Connotations Analyzor (CONAN) (C# - under construction) Collocations Extractor (C#) MTKit (Word Aligner + Editor - part of an ongoing MT project) (C#) SVM Based Sentence Aligner (C#) Net Search Library (C#) Google Screen Scraper Library (C#) Language Identifier (C#) Multilingual Thesauri Aligner (C#) Romanian Hyphenator (Active Perl)

2009

Radu ION, Dan Ştefănescu, Unsupervised Word Sense Disambiguation with Lexical Chains and Graph-based Context Formalization, in Proceedings of the 4th Language & Technology Conference, 6-8 Nov., Poznan, Poland, 2009
Verginica Barbu Mititelu, Alexandru Ceauşu, Radu Ion, Elena Irimia, Dan Ştefănescu, Dan Tufiş, Linguistic Resources for a Romanian QA System, in Revista Română de Interacţiune Om-Calculator 2, pp. 1-17, Bucharest, Romania, 2009
Radu Ion, Dan Ştefănescu, Alexandru Ceauşu, Dan Tufiş, Elena Irimia, Verginica Barbu-Mititelu, A Trainable Multi-factored QA System, in Proceedings of CLEF2009 Workshop, 30 Sept.-2 Oct., Corfu, Greece, 2009
Amalia Todiraşcu, Christopher Gledhill, Dan Ştefănescu, Extracting Collocations in Contexts, in Human Language Technology. Challenges of the Information Society, Lecture Notes in Computer Science Series, Springer Berlin / Heidelberg. ISSN: 0302-9743 (Print) 1611-3349 (Online), Volume 5603/2009, pp. 336-349, 2009. ISBN 978-3-642-04234-8
Dan Ştefănescu, Dan Tufiş, CONAN - Detecting the possible connotations of a text, in Diana Trandabăţ, Dan Cristea, Dan Tufiş (eds.) 4th Romanian Workshop for Linguistic Tools and Resources Volume, pp. 141-150, Iaşi, Romania, 2009 (ro)

2008

Radu Ion, Dan Ştefănescu, Alexandru Ceauşu, Important Practical Aspects of an Open-domain QA System Prototyping, Proceedings of the Romanian Academy, Series A, 6 p., The Publishing House of the Romanian Academy, 2008, Bucharest, Romania
Dan Tufiş, Dan Ştefănescu, Radu Ion, Alexandru Ceauşu, RACAI's Question Answering System at QA@CLEF 2007, in Carol Peters et al.(eds.), Advances in Multilingual and Multimodal Information Retrieval (CLEF 2007), volume 5152 of Lecture Notes in Computer Science, pp. 3284-3291, Springer-Verlag, Sep. 2008, ISBN 978-3-540-85759-4
Radu Ion, Dan Ştefănescu, Alexandru Ceauşu, Dan Tufiş, RACAI's QA System at the Romanian-Romanian Multiple Language Question Answering (QA@CLEF2008) Main Task, in Alessandro Nardi and Carol Peters (eds.), Working Notes for the CLEF 2008 Workshop, 10p., Sep. 2008, Aarhus, Denmark
Amalia Todiraşcu, Ulrich Heid, Dan Ştefănescu, Dan Tufiş, Christopher Gledhill, Marion Weller, Francois Rousselot, Vers un dictionnaire de collocations multilingue, in Cahier de Linguistique, 33/1, August 2008, pp. 161-186, Louvain. ISSN 0771-6524 (fr)
Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, ROTEL: Linguistic Web Services, in Proceedings of the Excellence Research – A Way to Innovation (CEEX 2008), pp. 29-1 – 29-6, 2008, Braşov, Romania
Amalia Todiraşcu, Dan Tufiş, Ulrich Heid, Christopher Gledhill, Dan Ştefănescu, Marion Weller, François Rousselot, A Mix Approach to Extracting and Classifying Verb+Noun Constructions, in Proceedings of The 6th Language Resources and Evaluation Conference - LREC 2008, 28-30 May, Marrakech, Morocco
Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, RACAI's Linguistic Web Services, in Proceedings of The 6th Language Resources and Evaluation Conference - LREC 2008, 28-30 May, Marrakech, Morocco
Dan Ştefănescu, Alexandru Ceauşu, Radu Ion, Amalia Todiraşcu, Ulrich Heid, Christopher Gledhill, François Rousselot, Extraction de collocations monolingues et bilingues: application a la traduction, The Latin Union Conference, 28-29 Feb. 2008, Bucharest, Romania (fr). ISBN 978-9-291220-37-3
Dan Tufiş, Radu Ion, Luigi Bozianu, Alexandru Ceauşu, Dan Ştefănescu, Romanian Wordnet: Current State, New Applications and Prospects, in Attila Tanacs, Dora Csendes, Veronika Vincze, Christiane Fellbaum, and Piek Vossen (eds.), 4th Global WordNet Conference, GWC-2008, pp. 441-452, January 2008, Szeged, Hungary. University of Szeged, Hungary. ISBN 978-963-482-854-9

2007

Amalia Todiraşcu, Christopher Gledhill, Dan Ştefănescu, Extracting Collocations in Context, in Proceedings of 3rd Language & Technology Conference, 5-7 Oct. 2007, Poznan, Poland
Amalia Todiraşcu, Christopher Gledhill, Dan Ştefănescu, Extracting Collocations in Context: the case of Romanian VN constructions, in Proceedings of RANLP 2007, 27-29 Sep., Borovets, Bulgaria
Dan Tufiş, Dan Ştefănescu, Radu Ion, Alexandru Ceauşu, RACAI's Question Answering System at QA@CLEF 2007, in Proceedings of CLEF2007 Workshop, 19-21 Sep., Budapest, Hungary

2006

Dan Ştefănescu, Dan Tufiş, Elena Irimia, Automatic Identification and Extraction of Collocations from Texts, in The 2nd Romanian Workshop for Linguistic Tools and Resources Volume, 3 Nov. 2006, Bucharest, Romania (ro)
Georgiana Puşcaşu, Adrian Iftene, Ionuţ Pistol, Diana Trandabăţ, Dan Tufiş, Alexandru Ceauşu, Dan Ştefănescu, Radu Ion, Constantin Orăşan, Iustin Dornescu, Alex Moruz, Dan Cristea, Developing a Question Answering System for the Romanian-English Track at CLEF 2006, in Proceedings of CLEF 2006 Workshop, 20-22 Sep., Alicante, Spain
Dan Ştefănescu, Dan Tufiş, Aligning Multilingual Thesauri, in Proceedings of The 5th Language Resources and Evaluation Conference - LREC 2006, 22-28 May, Genoa, Italy
Alexandru Ceauşu, Dan Ştefănescu, Dan Tufiş, Acquis Communautaire Sentence Alignment using Support Vector Machines, in Proceedings of The 5th Language Resources and Evaluation Conference - LREC 2006, 22-28 May, Genoa, Italy
Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, Improved Lexical Alignment by Combining Multiple Reified Alignments, in Proceedings of EACL 2006, 3-7 Apr., Trento, Italy

2005

Dan Tufiş, Alexandru Ceauşu, Radu Ion, Dan Ştefănescu, An integrated platform for high-accuracy word alignment, in Proceedings of JRC Enlargement and Integration Workshop: Exploiting parallel corpora in up to 20 languages, 26-27 Sep. 2005, Arona, Italy
Dan Tufiş, Radu Ion, Dan Ştefănescu, Alexandru Ceauşu, Word Senses and Cross-lingual Word Sense Disambiguation, in Proceedings of EUROLAN 2005, 25 July - 6 Aug., Cluj, Romania
Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, Combining Word Alignments, in Proceedings of ACL 2005 Workshop on "Building and Using Parallel Corpora: Data-driven Machine Translation and Beyond", 29-30 June, Ann Arbor, Michigan, USA

Amalia Todiraşcu, Dan Ştefănescu, Christopher Gledhill, An Application for Collocation Extraction, in The 3rd Romanian Workshop for Linguistic Tools and Resources Volume, Romania, 2007 (ro)
Dan Tufiş, Radu Ion, Alexandru Ceauşu, Dan Ştefănescu, RACAI's Linguistic Web Services, in The 3rd Romanian Workshop for Linguistic Tools and Resources Volume, Romania, 2007 (ro)
Cristina Niculescu, Cornel Lepadatu, Dan Ştefănescu, SSCBI - A Teleworking Environment of Support Systems for Knowledge Culture, in Proceedings of REV 2007, Portugal
Dan Ştefănescu, Aligning Unequal Multilingual Thesauri, in Proceedings of CESCL 2006, Hungary
Dan Tufiş, Radu Ion, Elena Irimia, Verginica Barbu Mititelu, Alexandru Ceauşu, Dan Ştefănescu, Luigi Bozianu, Catalin Mihaila, Resources, Tools and Algorithms for the Semantic Web, in Proceedings of IST - Multidisciplinary approaches, Romania, 2006
Alexandru Ceauşu, Dan Tufiş, Dan Ştefănescu, Sentence and word alignment using Support Vector Machines, in Proceedings of IST - Multidisciplinary approaches, Romania, 2006
Gheorghe Ionesei, Dan Ştefănescu, Irving Fisher's Real Rate of Interest versus Geanakopolos' Riskless Asset, Observer Journal, Romanian Academy, 2005, Romania

Academic Background

Work Experience

Languages

Publications / Scholar Activities

Awards Received

Interests

Programming

Natural Language Processing

Data Mining

Others

Applications developed