Contact Information

Email: richardzens [ - at - ] gmail [ - dot - ] com

Publications

2008

• Nicola Bertoldi, Richard Zens, Marcello Federico and Wade Shen. Efficient Speech Translation through Confusion Network Decoding. IEEE Transactions on Audio, Speech and Language Processing, vol. 16, no. 8, pp. 1696-1705, November 2008.
• Richard Zens and Hermann Ney. Improvements in Dynamic Programming Beam Search for Phrase-based Statistical Machine Translation. In Proceedings of the International Workshop on Spoken Language Translation (IWSLT), Honolulu, HI, October 2008.
  
• Richard Zens. Phrase-based Statistical Machine Translation: Models, Search, Training. Dissertation, Aachen, Germany, February 2008.

2007

• Yuqi Zhang, Richard Zens and Hermann Ney. Improved Chunk-level Reordering for Statistical Machine Translation. In Proceedings of the International Workshop on Spoken Language Translation (IWSLT), pp. 21-28, Trento, Italy, October 2007.
• Philipp Koehn, Marcello Federico, Wade Shen, Nicola Bertoldi, Ondřej Bojar, Chris Callison-Burch, Brooke Cowan, Chris Dyer, Hieu Hoang, Richard Zens, Alexandra Constantin, Christine Corbett Moran and Evan Herbst. Open Source Toolkit for Statistical Machine Translation: Factored Translation Models and Confusion Network Decoding. Center for Language and Speech Processing (CLSP) Summer Workshop Final Report WS-2006, Johns Hopkins University, Baltimore, MD, September 2007.

• Richard Zens, Saša Hasan and Hermann Ney. A Systematic Comparison of Training Criteria for Statistical Machine Translation. In Proceedings of the Conference on Empirical Methods in Natural Language Processing (EMNLP), pp. 524-532, Prague, Czech Republic, June 2007.

• Nicola Ehling, Richard Zens and Hermann Ney. Minimum Bayes Risk Decoding for BLEU. In Proceedings of the Annual Meeting of the Association for Computational Linguistics (ACL), Poster Session, pp. 101-104, Prague, Czech Republic, June 2007.

• Philipp Koehn, Hieu Hoang, Alexandra Birch, Chris Callison-Burch, Marcello Federico, Nicola Bertoldi, Brooke Cowan, Wade Shen, Christine Moran, Richard Zens, Chris Dyer, Ondřej Bojar, Alexandra Constantin and Evan Herbst. Moses: Open Source Toolkit for Statistical Machine Translation. In Proceedings of the Annual Meeting of the Association for Computational Linguistics (ACL), Poster Session, pp. 177-180, Prague, Czech Republic, June 2007.

• Richard Zens and Hermann Ney. Efficient Phrase-table Representation for Machine Translation with Applications to Online MT and Speech Translation. In Proceedings of the Human Language Technology Conference of the North American Chapter of the Association for Computational Linguistics (HLT-NAACL), pp. 492-499, Rochester, NY, April 2007.

• Saša Hasan, Richard Zens and Hermann Ney. Are Very Large N-best Lists Useful for SMT? In Proceedings of the Human Language Technology Conference of the North American Chapter of the Association for Computational Linguistics (HLT-NAACL), Companion Volume: Short Papers, pp. 57-60, Rochester, NY, April 2007.

• Yuqi Zhang, Richard Zens and Hermann Ney. Chunk-Level Reordering of Source Language Sentences with Automatically Learned Rules for Statistical Machine Translation. In Human Language Technology Conference of the North American Chapter of the Association for Computational Linguistics (HLT-NAACL): Proceedings of the Workshop on Syntax and Structure in Statistical Translation (SSST), pp. 1-8, Rochester, NY, April 2007.

• Nicola Bertoldi, Richard Zens and Marcello Federico. Speech Translation by Confusion Network Decoding. In Proceedings of the International Conference on Acoustics, Speech, and Signal Processing (ICASSP), vol. IV, pp. 1297-1300, Honolulu, Hawaii, April 2007.

• Heng Ji, Matthias Blume, Dayne Freitag, Ralph Grishman, Shahram Khadivi, and Richard Zens. NYU-Fair Isaac-RWTH Chinese to English Entity Translation 07 system. In Proceedings of the ACE ET 2007 PI/Evaluation Workshop, Washington, D.C., March 2007.

2006

• Wade Shen, Richard Zens, Nicola Bertoldi and Marcello Federico. The JHU Workshop 2006 IWSLT System. In Proceedings of the International Workshop on Spoken Language Translation (IWSLT), pp. 59-63, Kyoto, Japan, November 2006.

• Arne Mauser, Richard Zens, Evgeny Matusov, Saša Hasan and Hermann Ney. The RWTH Statistical Machine Translation System for the IWSLT 2006 Evaluation. Best Paper Award. In Proceedings of the International Workshop on Spoken Language Translation (IWSLT), pp. 103-110, Kyoto, Japan, November 2006.

• Shahram Khadivi, Richard Zens and Hermann Ney. Integration of Speech to Computer-Assisted Translation Using Finite-State Automata. In Proceedings of the COLING/ACL, pp. 467-474, Sydney, Australia, July 2006.

• Saša Hasan, Shahram Khadivi, Richard Zens and Hermann Ney. A Flexible Architecture for CAT Applications. In Proceedings of the 11th Annual Conference of the European Association for Machine Translation (EAMT), pp. 81-88, Oslo, Norway, June 2006.

• Evgeny Matusov, Richard Zens, David Vilar, Arne Mauser, Maja Popović and Hermann Ney. The RWTH Machine Translation System. In Proceedings of the TC-Star Workshop on Speech-to-Speech Translation, pp. 31-36, Barcelona, Spain, June 2006.

• Richard Zens and Hermann Ney. Discriminative Reordering Models for Statistical Machine Translation. In Human Language Technology Conference of the North American Chapter of the Association for Computational Linguistics (HLT-NAACL): Proceedings of the Workshop on Statistical Machine Translation, pp. 55-63, New York City, NY, June 2006.

• Richard Zens and Hermann Ney. N-gram Posterior Probabilities for Statistical Machine Translation. In Human Language Technology Conference of the North American Chapter of the Association for Computational Linguistics (HLT-NAACL): Proceedings of the Workshop on Statistical Machine Translation, pp. 72-77, New York City, NY, June 2006.

• Jia Xu, Richard Zens and Hermann Ney. Partitioning Parallel Documents Using Binary Segmentation. In Human Language Technology Conference of the North American Chapter of the Association for Computational Linguistics (HLT-NAACL): Proceedings of the Workshop on Statistical Machine Translation, pp. 78-85, New York City, NY, June 2006.

2005

• Richard Zens, Oliver Bender, Saša Hasan, Shahram Khadivi, Evgeny Matusov, Jia Xu, Yuqi Zhang and Hermann Ney. The RWTH Phrase-based Statistical Machine Translation System. In Proceedings of the International Workshop on Spoken Language Translation (IWSLT), pp. 155-162, Pittsburgh, PA, October 2005.

• Jia Xu, Evgeny Matusov, Richard Zens and Hermann Ney. Integrated Chinese Word Segmentation in Statistical Machine Translation. In Proceedings of the International Workshop on Spoken Language Translation (IWSLT), pp. 141-147, Pittsburgh, PA, October 2005.

• David Vilar, Evgeny Matusov, Saša Hasan, Richard Zens and Hermann Ney. Statistical Machine Translation of European Parliamentary Speeches. In Proceedings of the MT Summit X, pp. 259-266, Phuket, Thailand, September 2005.

• Richard Zens and Hermann Ney. Word Graphs for Statistical Machine Translation. In Proceedings of the ACL Workshop on Building and Using Parallel Texts: Data-Driven Machine Translation and Beyond, pp. 191-198, Ann Arbor, MI, June 2005.

• Stephan Kanthak, David Vilar, Evgeny Matusov, Richard Zens and Hermann Ney. Novel Reordering Approaches in Phrase-Based Statistical Machine Translation. In Proceedings of the ACL Workshop on Building and Using Parallel Texts: Data-Driven Machine Translation and Beyond, pp. 167-174, Ann Arbor, MI, June 2005.

• Oliver Bender, Saša Hasan, David Vilar, Richard Zens and Hermann Ney. Comparison of Generation Strategies for Interactive Machine Translation. In Proceedings of the 10th Annual Conference of the European Association for Machine Translation (EAMT), pp. 33-40, Budapest, Hungary, May 2005.

• Jia Xu, Richard Zens and Hermann Ney. Sentence Segmentation Using IBM Word Alignment Model 1. In Proceedings of the 10th Annual Conference of the European Association for Machine Translation (EAMT), pp. 280-287, Budapest, Hungary, May 2005.

2004

• Oliver Bender, Richard Zens, Evgeny Matusov and Hermann Ney. Alignment Templates: the RWTH SMT System. In Proceedings of the International Workshop on Spoken Language Translation (IWSLT), pp. 79-84, Kyoto, Japan, September 2004.

• Evgeny Matusov, Maja Popović, Richard Zens and Hermann Ney. Statistical Machine Translation of Spontaneous Speech with Scarce Resources. In Proceedings of the International Workshop on Spoken Language Translation (IWSLT), pp. 139-146, Kyoto, Japan, September 2004.

• Richard Zens, Evgeny Matusov and Hermann Ney. Improved Word Alignment Using a Symmetric Lexicon Model. In Proceedings of the 20th International Conference on Computational Linguistics (CoLing), pp. 36-42, Geneva, Switzerland, August 2004.

• Richard Zens, Hermann Ney, Taro Watanabe and Eiichiro Sumita. Reordering Constraints for Phrase-Based Statistical Machine Translation. In Proceedings of the 20th International Conference on Computational Linguistics (CoLing), pp. 205-211, Geneva, Switzerland, August 2004.

• Evgeny Matusov, Richard Zens and Hermann Ney. Symmetric Word Alignments for Statistical Machine Translation. In Proceedings of the 20th International Conference on Computational Linguistics (CoLing), pp. 219-225, Geneva, Switzerland, August 2004.

• Jia Xu, Richard Zens and Hermann Ney. Do We Need Chinese Word Segmentation for Statistical Machine Translation? In Proceedings of the Third SIGHAN Workshop on Chinese Language Learning, pp. 122-128, Barcelona, Spain, July 2004.

• Richard Zens and Hermann Ney. Improvements in Phrase-Based Statistical Machine Translation. In Proceedings of the Human Language Technology Conference / North American Chapter of the Association for Computational Linguistics Annual Meeting (HLT-NAACL), pp. 257-264, Boston, MA, May 2004.

2003

• Richard Zens and Hermann Ney. A Comparative Study on Reordering Constraints in Statistical Machine Translation. In Proceedings of the Annual Meeting of the Association for Computational Linguistics (ACL), pp. 144-151, Sapporo, Japan, July 2003.

• Franz Josef Och, Richard Zens and Hermann Ney. Efficient Search for Interactive Statistical Machine Translation. In Proceedings of the 10th Conference of the European Chapter of the Association for Computational Linguistics (EACL), pp. 387-393, Budapest, Hungary, April 2003.

2002

• Richard Zens, Franz Josef Och and Hermann Ney. Phrase-Based Statistical Machine Translation. In: M. Jarke, J. Koehler, G. Lakemeyer (Eds.) : KI - 2002: Advances in Artificial Intelligence. 25. Annual German Conference on AI, KI 2002, Vol. LNAI 2479, pp. 18-32, Springer Verlag, September 2002.

• Richard Zens. Kontextabhängige Statistische Übersetzungsmodelle (Context-dependent Statistical Translation Models). Diploma Thesis (in German). Lehrstuhl für Informatik 6, RWTH Aachen University, Aachen, Germany, May 2002.