Postdoctoral Researcher

Hasso-Plattner-Institut for IT Systems Engineering

Research School on "Service-Oriented Systems Engineering"

• Research Interest
• Education
• Teaching
• Professional Activities
• Publications

• Information Retrieval and Information Extraction
• Natural Language Processing and Language Modeling
• Sentiment Analysis and Social Networks 
• Knowledge Base Population and Question Answering Systems

•  2007 - 2011 
   PhD student in Computer Science at the partnership for research and education (PIRE) Meaning Representations in Language Understanding at Saarland University, Saarbrucken, Germany. 
   German Research Foundation (DFG) scholarship. 
• 2009 
   Visiting Researcher at CLSP lab. of Johns Hopkins University, Baltimore, USA. 
• 2005 - 2007 
   Master of Science in Computer Engineering, Artificial Intelligence, at Sharif University of Technology, Tehran, Iran 
•  2001 - 2005 
   Bachelor of Science in Computer Engineering, Software Engineering, at Sharif University of Technology, Tehran, Iran 
•  2000 - 2001 
   Pre-University in Mathematics and Physics at Maryam Pre-University, Saveh, Iran 

 
• Lecturer at Hasso-Plattner-Institut, Potsdam, Germany
  • SS 2012: Natural Language Processing
  • WS 2011/2012: Question Answering Systems

• Guest Lecturer and Teacher Assistant at Hasso-Plattner-Institut, Potsdam, Germany
  • SS 2011: Search Engines

• Lecturer at Azad University, Saveh, Iran  
  • WS 2006/2007: System Analysis and Design
  • WS 2006/2007: Software Engineering

• Teacher Assistant at Sharif University of Technology, Tehran, Iran
  • WS 2006/2007: Data Structure 
  • WS 2006/2007: Software Engineering
  • SS 2005: Design Algorithm
  • WS 2003/2004: Design Algorithm
  • SS 2003: Data Structure         

• at Hasso-Plattner-Institut, Potsdam, German
  • WS 2011/12 - SS 2012: Bachelor's project "CelebDB: Harvesting Celebrity Data"
  • WS 2011/12: Fabian Lindenberg - Master Student - "Generating Query Suggestions by Exploiting Latent Semantics in Query Logs" 
  • SS 2012: Michael Leben - Master Student - "Automated Email
     Foldering Using Contextual Features"
• at Saarland University, Saarbrücken, Germany
  • SS 2010: Farina Freigang – Master Student - "Language Modeling for In-car ASR Error Correction: Performance vs. Interaction Costs" 
  • SS 2008: Joo-Eun Feit – Bachelor Student - Opinion Sentence Annotation for Question Answering Systems

•  Program Committee
  • IEEE International Conference on Computational Linguistics Applications (CLA), 2010-present.
  • Elsevier International Journal of Information Systems (IS), 2011-present.
   

• Reviewing Committee
  • Erasmus Mundus European Master Program in Language and Communication Technology (LCT), Saarland University, Saarbrücken, Germany, 2008-2011.
  • Master Program in Language Science and Technology (LST), Saarland University, Saarbrücken, Germany, 2010.
   

• Head of Scientific Student Chapter
   Department of Computer Engineering, Sharif University of Technology, Tehran, Iran, 2005 

• Journal Papers
  •  M. Ghayoomi, S. Momtazi, M. Bijnkhan 
      "A Study of Corpus Development for Persian" pdf
     International Journal of Asian Language Processing, 20(1): 17-33, 2010.

•  Thesises:
  • S. Momtazi 
      "Advanced Language Modeling for Sentence Retrieval and Classification in Question Answering Systems"  online version
     PhD Thesis, Computer Science Department, Saarland University, Saarbrücken, Germany, 2010. 
  • S. Momtazi 
      "Fuzzy Word Clustering for Building Statistical Language Models in Continuous Speech Recognition Systems" 
     M.Sc. Thesis, Computer Engineering Department, Sharif University Of Technology, Tehran, Iran, 2007. 
  •  S. Momtazi, M. Fazel-Zarandi 
     "Robust Parsing for Word Lattices in Continuous Speech Recognition Systems" 
     B.Sc. Thesis, Computer Engineering Department, Sharif University Of Technology, Tehran, Iran, 2005.

• Conference and Workshop Papers
  • M. Felde, S. Momtazi, F. Freigang, D. Klakow, C. Muller
     "Mobile Texting: Can Post-ASR Correction Solve the Issues? An Experimental Study on Gain vs. Costs"   
     Proceedings of International Conference on Intelligent User Interfaces (IUI), Lisbon, Portugal, 2012 (to appear)
  • S. Momtazi
     "Fine-grained German Sentiment Analysis on Social Media"   
     Proceedings of International Conference on Language Resources and Evaluation (LREC), Istanbul, Turkey, 2012 (to appear)
  • S. Momtazi, D. Klakow   "Trained Trigger Language Model for Sentence Retrieval in QA: Bridging the Vocabulary Gap"   
      Proceedings of International ACM Conference on Information and Knowledge Management (CIKM), Glasgow, UK, 2011.
  • G. Chrupala, S. Momtazi, M. Wiegand, S. Kazalski, F. Xu, B. Roth, A. Balahur, D. Klakow 
     "Saarland University Spoken Language Systems at the Slot Filling Task of TAC KBP 2010"   pdf
     Proceedings of International Text Analysis Conference (TAC), NIST Campus, Maryland, USA, 2010.
  • S. Momtazi, F. Faubel, D. Klakow 
      "Within and Across Sentence Boundary Language Model"   pdf
     Proceedings of International IEEE INTERSPEECH Conference, Makuhari, Japan, 2010.
  •  S. Momtazi, M. Lease, D. Klakow 
      "Effective Term Weighting for Sentence Retrieval"   pdf
     Proceedings of European Conference on Research and Advanced Technology for Digital Libraries (ECDL), Glasgow, UK, 2010.
  •  S. Momtazi, D. Klakow 
      "Hierarchical Pitman-Yor Language Model for Information Retrieval"   pdf
     Proceedings of International ACM SIGIR Conference on Research and Development in Information Retrieval, Geneva, Switzerland, 2010.
  •  S. Momtazi, S. Khudanpur, D. Klakow 
      "A Comparative Study on Word Co-occurrence for Term Clustering in Language Model-based Sentence Retrieval"   pdf 
     Proceedings of International Conference of North American Association of Computational Linguistics (NAACL), Los Angeles, USA, 2010.
  •  S. Momtazi, D. Klakow 
      "Yahoo! Answers for Sentence Retrieval in Question Answering"   pdf
     Proceedings of the LREC Workshop on Web Logs and Question Answering, Valletta, Malta, 2010.
  •  S. Momtazi, D. Klakow 
      "A Word Clustering Approach for Language Model-based Sentence Retrieval in Question Answering Systems"   pdf
     Proceedings of International ACM Conference on Information and Knowledge Management (CIKM), Hong Kong, China, 2009.
  •  S. Momtazi, D. Klakow 
      "Language Model-Based Sentence Classification for Opinion Question Answering Systems"   pdf
     Proceedings of IEEE International Conference on Computer Science and Information Technology - Computational Linguistics Applications (CLA), Mragowo, Poland, 2009.
  •  S. Momtazi, S. Kazalski, D. Klakow 
      "A Combined Query Expansion Technique for Retrieving Opinions from Blogs"   pdf 
     Proceedings of IEEE International Conference on Intelligent System Design and Applications (ISDA), Pisa, Italy, 2009.
  •  S. Momtazi, H. Sameti 
      "A Possibilistic Approach in Word Clustering for Building Statistical Language Models"   pdf
     Proceedings of IEEE International Conference on Intelligent System Design and Applications (ISDA), Pisa, Italy, 2009.
  •  M. Ghayoomi, S. Momtazi 
      "Challenges in Developing Persian Corpora from Online Resources"   pdf
     Proceedings of IEEE International Conference on Asian Language Processing (IALP), Singapore, 2009. 
  •  M. Ghayoomi, S. Momtazi 
      "An Overview on the Existing Language Models for Prediction Systems as Writing Assistant Tools"   pdf
     Proceedings of IEEE International Conference on System, Man, and Cybernetic (SMC), Texas, USA, 2009. 
  •  M. Wiegand, S. Momtazi, S. Kazalski, F. Xu, G. Chrupala, D. Klakow 
     "The Alyssa System at TAC QA 2008"   pdf 
     Proceedings International Text Analysis Conference (TAC), NIST Campus, Maryland, USA, 2008.
  •  S. Momtazi, S. Kafi, H. Beigy 
     "Solving Stochastic Path Problem: Particle Swarm Optimization Approach"   pdf 
     Proceedings of 21^st International Conference on Industrial, Engineering & other Applications Applied Intelligent Systems (IEA/AIE), Springer LNAI 5027, pp. 590-600, Wroclaw, Poland, 2008. 
  •  M. Bahrani, H. Sameti, N.Hafezi, S. Momtazi 
     "A New Word Clustering Method for Building n-gram Language Models in Continuous Speech Recognition Systems"   pdf
     Proceedings of 21^stInternational Conference on Industrial, Engineering & other Applications Applied Intelligent Systems (IEA/AIE), Springer LNAI 5027, pp. 286-293, Wroclaw, Poland, 2008.
  •  S. Momtazi, H.Sameti, S. Vaisipour, M. Tefagh 
     "Introducing a Framework to Create Telephony Speech Databases from Direct Ones"   pdf
     Proceedings of IEEE International Conference on Systems, Signal and Image Processing (IWSSIP), Maribor, Slovenia, 2007. 
  •  S. Momtazi, H. Sameti, M. Bahrani, N.Hafezi 
     "A pos-based fuzzy word clustering algorithm for continuous speech recognition systems",   pdf
     Proceedings of IEEE International Conference on Information Sciences, Signal Processing and its Applications (ISSPA), Sharjeh, UAE, 2007. 
  •  S. Momtazi, H. Sameti, M. Fazel-Zarandi, M. Bahrani 
    "A Robust Parser with Word Lattice for Continuous Speech Recognition Systems"    pdf
     Proceedings of IEEE International Conference on Information Sciences, Signal Processing and its Applications (ISSPA), Sharjeh, UAE, 2007.

• In Persian
  • M. Bahrani, H. Sameti, S. Momtazi, N.Hafezi 
    "Automatic Word Clustering based on Parts Of Speech for Continuous Speech Recognition Systems"
     Proceedings of 13^th International CSI Computer Conference, Kish Island, Iran, 2008. 
  •  S. Momtazi, H. Sameti, M. Bahrani, N.Hafezi 
      "A Fuzzy Approach in Word Clustering for Building Statistical Language Models" 
     Proceedings of 12^th International CSI Computer Conference, Tehran, Iran, 2007. 
  •  S. Momtazi, M. Fazel-Zarandi, H. Sameti, M. Bahrani 
     "Using a Partial Robust Parser for Continuous Speech Recognition Systems" 
     Proceedings of 11^th CSI Computer Conference, Tehran, Iran, 2006. 
  •  M. Bahrani, H. Sameti, N. Hafezi, S. Momtazi, H. Movassagh 
     "Using Persian Corpus in Building Statistical Language Model for Persian Continuous Speech Recognition Systems" 
     Proceedings of 2nd Persiancoling Workshop, Tehran, Iran, 2006. 
  •  F. Sharifian, S. Momtazi 
     "An Intelligent Method for Improving the Performance of the Partial Order Planning Algorithm" 
     Proceedings of 4^th Computer Conference, Tehran, Iran, 2006. 
  •  S. Momtazi, M. Akbari, Z. Sazvar, M. Khakestani 
     "Software Feasibility of Logistic Systems in Iran-Khodro Company" 
     Proceedings of 2nd National Conference on Logistics & Supply Chain, Tehran, Iran, 2006.