English Version

Dr. Marius-Nicolae Popescu





Marius Popescu, Lecturer at the University of Bucharest, Department of Computer Science, since 2004. Ph.D. in 2004 with the thesis "Machine Learning Applied in Natural Language Processing".

My domains of interest are: artificial intelligence, machine learning, computational linguistics, information retrieval, authorship identification, computer vision. My achievements in these fields include: a new method for automatic word sense disambiguation that was awarded third prize at the Senseval 3 evaluation exercises for word sense disambiguation organized by ACL-SIGLEX in 2004; coauthor of the method ENCOPLOT for plagiarism detection which won the first international competition in automatic plagiarism detection in 2009, followed by ranking 4th at PAN@CLEF 2010 and 2nd at PAN@CLEF 2011; a method for authorship analysis which obtained the best results in the author identification task at PAN@CLEF 2012; Co-author of learning systems that ranked on 3rd place in the Native Language Identification Shared Task of the BEA 8 Workshop of NAACL 2013, and on 4th place in the Facial Expression Recognition Challenge of the WREPL Workshop of ICML 2013.
Publications:
  1. Marius Popescu. Training Strategies in Learning to Play Games. Annals of the University of Bucharest, Mathematics - Computer Science, Special Issue, Proceedings of Annual Meeting of Faculty of Mathematics, 28-30 nov. 1996, p. 147-163.
  2. Marius Popescu. Maximum Entropy Models for Dependency Parsing. Annals of the University of Bucharest, COMPUTER SCIENCE, an XLVI, 1997, p. 115-122.
  3. Florentina Hristea, Marius Popescu. A Word Grammar Approach to Syntactic Analysis with Special Reference to Romanian. Annals of the University of Bucharest, Mathematics - Computer Science, Special Issue, Proceedings of the Annual Meeting of the Faculty of Mathematics, 8-9 May 1998, p. 101-111.
  4. Florentina Hristea, Marius Popescu. A Dependency Grammar Approach to Syntactic Analysis with Special Reference to Romanian. In: Building Awareness in Language Technology (eds. Florentina Hristea and Marius Popescu). Editura Universitatii din Bucuresti, 2003, p. 9-16.
  5. Marius Popescu. Dependency Grammar Annotator. In: Building Awareness in Language Technology (eds. Florentina Hristea and Marius Popescu). Editura Universitatii din Bucuresti, 2003, p.17-34.
  6. Marius Popescu. Regularized Least-Squares Classification for Word Sense Disambiguation. Proceedings of The Third International Workshop on the Evaluation of Systems for the Semantic Analysis of Text (Senseval-3). ACL-2004 Workshop. Barcelona: Jul 2004, p. 209-212.
  7. Florentina Hristea, Marius Popescu. On Some Romanian Text Summarization Contributions. Revue Roumaine de Linguistique, VOL. LI, Issues 3-4, 2006, p. 507-509.
  8. Marius Popescu, Liviu P. Dinu Kernel Methods and String Kernels for Authorship Identification: The Federalist Papers Case. Proceedings of the International Conference on Recent Advances in Natural Language Processing (RANLP-07). Borovets, Bulgaria. 2007.
  9. Marius Popescu, Liviu P. Dinu. Rank Distance as a Stylistic Similarity. Proceedings of the 22nd International Conference on Computational Linguistics (Coling 2008). Manchester, UK. 2008.
  10. Liviu P. Dinu, Marius Popescu. A Multi-Criteria Decision Method Based on Rank Distance. Fundamenta Informaticae. 86(1-2), 2008.
  11. Florentina Hristea, Marius Popescu, Monica Dumitrescu. Performing word sense disambiguation at the border between unsupervised and knowledge-based techniques. Artificial Intelligence Review. 30(1-4), 2008.
  12. Florentina Hristea, Marius Popescu. Adjective Sense Disambiguation at the Border Between Unsupervised and Knowledge-Based Techniques. Fundamenta Informaticae. 91(3-4), 2009.
  13. Liviu P. Dinu, Marius Popescu. A Language Independent Kernel Method for Classifying Texts with Disputed Paternity. Proceedings of the XIII International Conference Applied Stochastic Models and Data Analysis (ASMDA 2009). Vilnius, Lithuania. 2009.
  14. Vivi Nastase, Marius Popescu. What.s in a name? In some languages, grammatical gender. Proceedings of the EMNLP 2009 Conference on Empirical Methods in Natural Language Processing. Singapore. 2009.
  15. Marius Popescu, Liviu P. Dinu. Comparing Statistical Similarity Measures for Stylistic Multivariate Analysis. Proceedings of the International Conference on Recent Advances in Natural Language Processing (RANLP-09). Borovets, Bulgaria. 2009.
  16. Cristian Grozea, Christian Gehl, Marius Popescu. ENCOPLOT: Pairwise Sequence Matching in Linear Time Applied to Plagiarism Detection. Proceedings of the 3rd PAN Workshop: Uncovering Plagiarism, Authorship and Social Software Misuse. San Sebastian, Spain. 2009.
  17. Liviu P. Dinu, Marius Popescu. Ordinal measures in authorship identification. Proceedings of the 3rd PAN Workshop: Uncovering Plagiarism, Authorship and Social Software Misuse. San Sebastian, Spain. 2009.
  18. Cristian Grozea, Marius Popescu. Who's the Thief? Determining the Direction of Plagiarism. 11th International Conference on Intelligent Text Processing and Computational Linguistics, CICLing-2010: March 21-27, 2010, Iasi, Romania. Proceedings. Lecture Notes in Computer Science, 6008, Springer, 2010.
  19. Cristian Grozea, Marius Popescu. Encoplot - Performance in the Second International Plagiarism Detection Challenge. Lab Report for PAN at CLEF 2010 . CLEF (Notebook Papers/LABs/Workshops) 2010.
  20. Marius Popescu, Florentina Hristea. State of the art versus classical clustering for unsupervised word sense disambiguation. Artificial Intelligence Review. 35(3), 2011.
  21. Cristian Grozea, Marius Popescu. The Encoplot Similarity Measure for Automatic Detection of Plagiarism. - Notebook for PAN at CLEF 2011 . CLEF (Notebook Papers/LABs/Workshops) 2011.
  22. Marius Popescu. Studying Translationese at the Character Level. Proceedings of the International Conference on Recent Advances in Natural Language Processing (RANLP 2011). Hissar, Bulgaria. 2011.
  23. Marius Popescu, Cristian Grozea. Kernel Methods and String Kernels for Authorship Analysis. CLEF (Online Working Notes/Labs/Workshop) 2012.
  24. Cristian Grozea, Marius Popescu. Encoplot - Tuned for High Recall (also Proposing a New Plagiarism Detection Score). CLEF (Online Working Notes/Labs/Workshop) 2012.
  25. Dinu, Liviu Petrisor, Radu-Tudor Ionescu, Marius Popescu. Local patch dissimilarity for images. Neural Information Processing. Springer Berlin Heidelberg, 2012.
  26. Popescu, Marius, Radu Tudor Ionescu. The Story of the Characters, the DNA and the Native Language. NAACL/HLT 2013 (2013): 270.
  27. Ionescu, Radu Tudor, Marius Popescu, Cristian Grozea. Local Learning to Improve Bag of Visual Words Model for Facial Expression Recognition. ICML 2013 Workshop on Representation Learning, Atlanta, Georgia, USA, 2013.


BOOKS; EDITOR:

Florentina Hristea, Marius Popescu (eds.). Building Awareness in Language Technology. Editura Universitatii din Bucuresti, 2003 (478 pag.).




ACTIUNI, COACTIUNI SI GRADUARI PE ALGEBRE

 

ACTIUNI, COACTIUNI SI GRADUARI PE ALGEBRE

COD IDEI 1904, contract nr. 479/13.01.2009

Descriere succinta a proiectului de cercetare

Conceptul de graduare isi are originea in teoria polinoamelor si este un instrument important de studiu in teoria reprezentarilor de grupuri, algebra comutativa, geometrie algebrica, comologie, algebre Lie, geometrie diferentiala si fizica teoretica. Cum o G-graduare a unei k-algebre este exact o structura de k[G]-comodul algebra, graduarile sunt cazuri speciale de coactiuni. Proiectul abordeaza, din punct de vedere al graduarii, mai multe directii actuale de cercetare din algebra necomutativa: algebre semisimple, algebre envelopante universale, algebre envelopante cuantice, actiuni si coactiuni pentru algebre de tip Hopf, algebre de (quasi)matrice, algebre de polinoame. Pe scurt, obiectivele stiintifice principale ale proiectului sunt:
1.Studiul graduarilor pe algebre semisimple dupa grupuri.
2.Studiul graduarilor pe algebre de matrice dupa semigrupuri.
3.Studiul graduarilor algebrei de polinoame dupa un grup.
4.Obtinerea de graduari dupa un grup pe algebre universale envelopante si pe algebre envelopante cuantice.
5.Un studiu al coactiunilor unor grupuri cuantice pe anumite clase de algebre.
6.Caracterizarea categoriilor definite de actiuni si coactiuni ale unor (co)algebre graduate de tip Hopf ca si categorii de module graduate dupa un grup, peste o algebra graduata de tip produs smash.
7.Initierea unei teorii de tip Hopf-Galois pentru (co)algebre graduate de tip Hopf.
8.Obtinerea de structuri de quasialgebra graduata pe diverse inele de matrice.

Director de proiect

Prof.dr. Sorin Dascalescu, Facultatea de Matematica si Informatica a Universitatii din Bucuresti.

Seminarii de lucru

 Data  Titlul seminarului
 29.06.2009  Graduari dupa grupuri pe algebre semisimple
 03.09.2009  Actiuni si coactiuni de algebre de tip Hopf si categorii de module graduate induse de acestea
 12.10.2009  Graduari dupa semigrupuri pe algebre de matrice
 14.04.2010  Graduari pe algebra de polinoame
 23.06.2010  Graduari pe diverse algebre Lie
 06.10.2010  Problema generatorilor blanzi
 10.11.2010  Grupul automorfismelor lui g+, pentru g algebra Lie simpla complexa
 04.03.2011  Teorie Hopf-Galois 1
 18.03.2011  Teorie Hopf-Galois 2
 12.04.2011  Coactiuni ale grupurilor cuantice pe anumite clase de algebre 1
 26.04.2011  Coactiuni ale grupurilor cuantice pe anumite clase de algebre 1
 11.05.2011  1 Contexte Morita 1
 25.05.2011  Contexte Morita 2
 07.10.2011  Algebre de incidenta 1
 14.10.2011  Algebre de incidenta 2
 21.10.2011  Coalgebre de incidenta 1
 28.10.2011  Coalgebre de incidenta 2
 04.11.2011  (Co)algebre graduate de tip Cayley-Dickson 1
 11.11.2011  (Co)algebre graduate de tip Cayley-Dickson 2
 18.11.2011  Graduari pe (Co)algebre Clifford 1
 25.11.2011  Graduari pe (Co)algebre Clifford 2

Echipa de cercetare a grantului:

Cercetare sprijinita financiar de acest grant:

1. D. Bulacu, The weak braided Hopf algebra structure of some Cayley-Dickson algebras, J. Algebra 322 (2009), 2404-2427.
2. S. Dascalescu, C. Nastasescu, Coactions on spaces of morphisms, Algebras and Representation Theory 12 (2009), 193-198.
3. D. Bulacu, S. Caenepeel, B. Torrecillas, The braided monoidal structures on a category of vector spaces graded by the Klein group, Proceedings of the Edinburgh Mathematical Society 54(3) (2011), 613-641.
4. F. Castano Iglesias, C. Nastasescu, J. Vercruysse, Quasi-Frobenius functors. Applications, Comm. Algebra 38(2010), 3057-3077.
5. D. Bulacu, A Clifford algebra is a weak Hopf algebra in a suitable symmetric monoidal category, J. Algebra 332(1)(2011), 244-284.
6. S. Dascalescu, C. Nastasescu, A. Tudorache, A note on regular objects in Grothendieck categories, acceptata pentru publicare in Arabian J. Science and Engineering.
7. D. Bulacu, S. Caenepeel, Algebras graded by discrete Doi-Hopf data and the Drinfeld double of a Hopf group coalgebra, acceptata la Algebras and Representation Theory.
8. L. Daus, C. Nastasescu, M. Nastasescu, Von Neumann regularity of smash products associated with G-set gradings, acceptata la J. Algebra.
9. C. Boboc, S. Dascalescu, L. Van Wyk, Isomorphisms between Morita context rings, acceptata la Linear and Multilinear Algebra.
10. F. Castano Iglesias, C. Nastasescu, L. Nastasescu, Locally stable Grothendieck categories. Applications, acceptata la Applied Categorical Structures.
11. C. Buruiana, Abelian finite group gradings on the skew polynomial ring k[X][Y,\phi], acceptata pentru publicare in U.P.B. Sci. Bull., Ser. A.
12. S. Dascalescu, C. Nastasescu, G. Velicu, Balanced bilinear forms and finiteness properties for incidence coalgebras over a field, Rev. Union Mat. Argentina 51 (2010), 13-20.
13. D. Bulacu, S. Caenepeel, A monoidal structure on the category of relative Hopf modules, acceptata pentru publicare in Journal of Algebra and its applications.
14. S. Dascalescu, M. Iovanov, C. Nastasescu, Path subcoalgebras, subcoalgebras of incidence coalgebras, finiteness properties and quantum groups, trimisa spre publicare.
15. C. Buruiana, Group gradings on polynomial algebras, trimisa spre publicare.
16. S. Dascalescu, C. Nastasescu, B. Toader, Doi-Hopf modules associated to comodule coalgebras, trimisa spre publicare la Communications in Algebra.
17. S. Crivei, C. Nastasescu, L. Nastasescu, A generalization of the Mitchell lemma. The Ulmer theorem and the Gabriel-Popescu theorem revisited, trimisa spre publicare la Journal of Pure and Applied Algebra.

Teze de doctorat

1. A. Tudorache, Obiecte relativ regulate in categorii abeliene. Aplicatii la inele graduate si coalgebre, Teza de doctorat, sustinuta in martie 2010.
2. C. Buruiana, Actiuni si coactiuni pe algebre. Graduari, Teza de doctorat, sustinuta in septembrie 2011

Workshop

"Actiuni, coactiuni si graduari pe algebre", organizat pe data de 28.11.2011. Au fost sustinute urmatoarele prelegeri:
  - Module Doi-Hopf asociate comodul coalgebrelor;
  - Structuri braided monoidale pe anumite spatii vectoriale graduate;
  - Subcoalgebre ale coalgebrelor de incidenta;
  - Graduari pe inele de polinoame (strambe).

Raportari

2002 - 2015 -- Facultatea de Matematica si Informatica, Universitatea din Bucuresti
Str. Academiei nr. 14, sector 1, C.P. 010014, Bucuresti, Romania
Tel: (4-021) 314 2863, Fax: (4-021) 315 6990, secretariat fmi.unibuc.ro