Hamed Ketabdar

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Dr. Hamed Ketabdar
Dr.Hamed Ketabdar Deutsche Telekom Labratories, TU Berlin Ernst-Reuter-Platz 7 10587 Berlin, Germany phone: +49 (30) 8353-58228 email:Hamed.Ketabdar@telekom.de	Research Field: watch a video summarizing our activities Statistical Signal Processing Machine Learning Artificial Intelligence Human-Computer Interaction Research Topics: Context and environment aware mobile devices Enhancing interaction with mobile devices Speech and Audio Processing: Speech Recognition, Keyword Spotting, Confidence Measurement, Language Modelling, Multi-modal Interaction, Information Retrieval/Extraction/Distillation, Translation, Automatic Annotation Speech intelligibility Dialogue modeling
News My Interview with TAGESSPIEGEL My interview with NewScientist 24 Feb. 2010: Our project MagiThings has got World Wide attention in mobile device related forums! Just google "MagiTact" ....
Biography Hamed Ketabdar is a Senior Research Scientist at Quality and Usability Group, Deutsche Telekom Laboratories (T-Labs), Berlin, Germany. His main topic of research in T-labs is context aware applications for mobile phones. In order to recognize context, different modalities such as audio and sensory data are used. Recognition of context is then used to enhance behaviour and functionality of mobile phones, as well as designing new applications for security, health care and monitoring purposes. He received his PhD in Automatic Speech Recognition from Swiss Federal Institute of Technology at Lausanne (EPFL). He was a research assistant in Speech group of Idiap Research Institute (www.idiap.ch) from 2004 to 2008. During PhD studies, his research has been mainly on using artificial neural networks for acoustic modelling in speech recognition systems.
Projects MagiThings: MagiThings is a new interaction technique for efficient use of the 3D space around a mobile device. Our proposed method is based on using the magnetic sensor (compass) integrated in the new generation of mobile devices (e.g. iPhone 3GS, 4G and Google Nexus One) and using it for interacting with the user. By taking a properly shaped (rod, ring, pen, etc.) permanent magnet in hand, users can make coarse gestures in the 3D space surrounding the device and change the magnetic field pattern that effects the magnetic sensor of the device. These effects, then, can be used by the phone to perform certain tasks, based on the pattern of the movement. These tasks can vary from entering a text or digit into the phone to turning pages or zooming while reading an e-book. This novel, gesture-based interaction framework opens a new chapter in the field of Human-Computer Interaction (HCI) and has numerous applications such as gaming, authentication, text/digit entry, music playing and remote controlling of smart homes to name a few. Thus far, we have implemented some of these applications and have named them MagiTact, MagiWrite, MagiAudio, MagiGame and so on, according to their usage. Hierarchical Multimodal Interfaces: Hierarchical Multimodal Interface (HMI) is another active project that deals with detecting anomalies in the physical activities of a user and contacting a remote station (by calling or texting) upon detection of an emergency situation such as being in an accident or collapsing. This framework uses a multimodal interface to monitor the physical activities of a user and provides a designated emergency center with information about the user's location and the emergency situation. This application is especially helpful in the field of Assistive Technology (AT) where the user is prone to such accidents and due to a permanent physical handicap or temporal disability incurred after the accident needs emergency assistance. Besides its application in AT, HMI has other applications in entertainment and physical training as well.

Teaching • WS 2010/2011: Computer Supported Interaction • WS 2009/2010: Computer Supported Interaction • Usability Colloquium
Publications 2010 • MagiMusic: Using Embedded Compass (Magnetic) Sensor for Touch-less Gesture Based Interaction with Digital Music Instruments in Mobile Devices Hamed Ketabdar, AmirHossein JahanBekam, Kamer Ali Yuksel, Tobias Hirsch The Fifth International Conference on Tangible, Embedded and Embodied Interaction, Madeira, Portugal, January 23-26, 2011 Abstract (.txt), paper (.pdf) • Towards Implicit Enhancement of Security and User Authentication in Mobile Devices Based on Movement and Audio Analysis Hamed Ketabdar, Mehran Roshandel, Daria Skripko The Fifth International Conference on Tangible, Embedded and Embodied Interaction, Madeira, Portugal, January 23-26, 2011 Abstract (.txt), paper (.pdf) • MagiSign: User Identification/Authentication Based on 3D Around Device Magnetic Signatures Hamed Ketabdar, Kamer Ali Yuksel, AmirHossein JahanBekam, Mehran Roshandel, Daria Skripko The Fourth International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies, Italy, October 25-30, 2010 Abstract (.txt), paper (.pdf) • Towards Digital Music Performance for Mobile Devices Based on Magnetic Interaction Hamed Ketabdar, Kamer Ali Yuksel IEEE International Workshop on Haptic Audio Visual Environments and Games, Arizona State University, USA, October 16-17, 2010 Abstract(.txt), paper(.pdf) • Enhanced Phone Posteriors for Improving Speech Recognition Systems Hamed Ketabdar, Herve Bourlard IEEE Transactions on Speech and Audio Processing, Vol. 18, Issue: 6, pp. 1094-1106, August, 2010 Abstract(.txt), paper(.pdf) • MagiEntertain: Mobile Entertainment Interaction Based On Magnetic Field Hamed Ketabdar, Kamer Ali Yuksel Proceedings of the IADIS International Conference on Game and Entertainment Technologies, Freiburg, Germany, July 26-28, 2010 Abstract(.txt), paper(.pdf) • System and Methodology for Using Mobile Phones in Live Remote Monitoring of Physical Activities Hamed Ketabdar, Matti Lyra IEEE International Symposium on Technology and Society, pp. 350-356, Wollongong, Australia, June7-9, 2010 Abstract(.txt), paper(.pdf) • Web-inspired Sentence Complexity-Index Juan-Pablo Ramirez, Alexander Raake, Ashkan Sharifi, Hamed Ketabdar The Fourth IEEE International Conference on Semantic Computing, Carnegie Mellon University, USA, September 22-24, 2010 Abstract(.txt), paper(.pdf) • Intelligibility Predictions for Speech Against Fluctuating Masker Juan-Pablo Ramirez, Hamed Ketabdar, Alexander Raake Proceedings of the Interspeech 2010 Conference, Makuhari, Japan, September 26-30, 2010 Abstract(.txt), paper(.pdf) • Improving Cross Database Prediction of Dialogue Quality Using Mixture of Experts Klaus-Peter Engelbrecht, Hamed Ketabdar, Sebastian Möller Proceedings of the Interspeech 2010 Conference, Makuhari, Japan, September 26-30, 2010 Abstract(.txt), paper(.pdf) • Towards Using Embedded Magnetic Field Sensor for Around Mobile Device 3D Interaction Hamed Ketabdar, Kamer Ali Yuksel, Mehran Roshandel The Twelfth International Conference on Human-Computer Interaction with Mobile Devices and Services, Lisbon, Portugal, September 7-10, 2010 Abstract(.txt), paper(.pdf) • Improving Posterior Based Confidence Measures Using Enhanced Local Posteriors Hamed Ketabdar The Eighteenth European Signal Processing Conference, Aalborg, Denmark, August 23-27, 2010 Abstract(.txt), paper(.pdf) • MagiWrite: Towards Touchless Digit Entry Using 3D Space Around Mobile Devices Hamed Ketabdar, Kamer Ali Yuksel, Mehran Roshandel The Twelfth International Conference on Human-Computer Interaction with Mobile Devices and Services, Lisbon, Portugal, September 7-10, 2010 Abstract(.txt), paper(.pdf) • MagiTact: Interaction with Mobile Devices Based on Compass (magnetic) Sensor Hamed Ketabdar,Kamer Ali Yuksel, Mehran Roshandel Proceedings of the 2010 International Conference on Intelligent User Interfaces, pp. 413-414 , Hong Kong, China, 2010 Abstract(.txt), paper(.pdf) • ActivityMonitor: Assisted Life Using Mobile Phones Hamed Ketabdar, Matti Lyra Proceedings of the Fourteenth International Conference on Intelligent User Interfaces, pp. 417-418, Hong Kong, China, 2010 Abstract(.txt), paper(.pdf) • Smart Ring: Controlling Call Alert Functionality Based on Audio and Movement Analysis Hamed Ketabdar, Kamer Ali Yuksel Proceedings of the Fourteenth International Conference on Intelligent User Interfaces, pp. 415-416, Hong Kong, China, 2010 Abstract(.txt), paper(.pdf) 2009 • Tactile and Visual Alerts for Deaf People by Mobile Phones Hamed Ketabdar, Tim Polzehl Proceedings of the Eleventh International ACM SIGACCESS Conference on Computers and Accessibility, pp. 253-254, Pittsburgh, USA, 2009 Abstract(.txt), paper(.pdf) • Fall and Emergency Detection with Mobile Phones Hamed Ketabdar, Tim Polzehl Proceedings of the Eleventh International ACM SIGACCESS Conference on Computers and Accessibility, pp. 241-242, Pittsburgh, USA, 2009 Abstract(.txt), paper(.pdf) • Modeling User Satisfaction with Hidden Markov Model Klaus-Peter Engelbrech, Florian Goedde, Felix Hartard, Hamed Ketabdar, Sebastian Moeller Proceedings of the SIGDIAL 2009 Conference: The Tenth Annual Meeting of the Special Interest Group on Discourse and Dialogue, pp. 170-177, London, United Kingdom, September 11-12, 2009 Abstract(.txt), paper(.pdf) • Emotion Classification in Children's Speech Using Fusion of Acoustic and Linguistic Features Tim Polzehl, Shiva Sundaram, Hamed Ketabdar, Michael Wagner, Florian Metze Proceedings of the Interspeech 2009 Conference, Brighton, United Kingdom, September 6-10, 2009 Abstract(.txt), paper(.pdf) • Detecting Physical Shock by A Mobile Phone and Its Applications in Security and Emergency Hamed Ketabdar, Tim Polzehl Proceedings of the Eleventh International Conference on Human-Computer Interaction with Mobile Devices and Services, Bonn, Germany, 2009 Abstract(.txt), paper(.pdf) • Using Mobile Phones for Monitoring Physical Conditions Hamed Ketabdar Lecture Notes in Informatics, Proceedings of the Informatik 2009 Conference and the Third Workshop on Mobile and Embedded Interactive Systems, September, 2009 Abstract(.txt), paper(.pdf) • Enhancing Security and Emergency Functionalities in Mobile Phones by Audio and Movement Analysis Hamed Ketabdar, Tim Polzehl The Eleventh International Conference on Ubiquitous Computing, Florida, USA, September 30-October 3, 2009 Abstract(.txt), paper(.pdf) • Intelligibility Assessment for Fluctuating Masking Sources Juan-Pablo Ramirez, Hamed Ketabdar, Alexander Raake, Psycholinguistic Approaches to Speech Recognition in Adverse Conditions, March, 2010 Abstract(.txt), paper(.pdf) 2008 • Hierarchical Integration of Phonetic and Lexical Knowledge in Phone Posterior Estimation Hamed Ketabdar, Herve Bourlard Proceedings of IEEE Conference on Acoustics, Speech, and Signal Processing, pp. 4065-4068, Las Vegas, USA, March 31-April 4, 2008 Abstract(.txt), paper(.pdf) • Enhancing Posterior Based Speech Recognition Systems Hamed Ketabdar, Herve Bourlard PhD Thesis, Swiss Federal Institute of Technology at Lausanne, 2008 Abstract(.txt), paper(.pdf) 2007 • Detection of Out-of-vocabulary Words in Posterior based ASR Hamed Ketabdar, Mirko Hannemann, Hynek Hermansky Proceedings of the Interspeech 2007 Conference, Antwerp, Belgium, August 27-31, 2007 Abstract(.txt), paper(.pdf) • In-Context Phone Posteriors as Complementary Features for Tandem ASR Hamed Ketabdar, Herve Bourlard Proceedings of IEEE Conference on Acoustics, Speech, and Signal Processing, Las Vegas, USA, March 30-April 4, 2008 Abstract(.txt), paper(.pdf) 2006 • Posterior Based Keyword Spotting with a Priori Thresholds Hamed Ketabdar, Jithendra Vepa, Samy Bengio, Herve Bourlard International Conference on Spoken Language Processing, Pennsylvania, USA, September 17-21, 2006 Abstract(.txt), paper(.pdf) • Using More Informative Posterior Probabilities For Speech Recognition Hamed Ketabdar, Jithendra Vepa, Samy Bengio, Herve Bourlard Proceedings of 2006 IEEE International Conference on Acoustics, Speech and Signal Processing, pp.I-I, Toulouse, May 14-19, 2006 Abstract(.txt), paper(.pdf) 2005 • Local and Global Feature Selection for On-line Signature Verification Jonas Richiardi, Hamed Ketabdar, Andrzej Drygajlo Proceedings of the Eighth International Conference on Document Analysis and Recognition, Vol. 2, pp. 625-629, August 29-September 1, 2005 Abstract(.txt), paper(.pdf) • Global Feature Selection for On-line Signature Veriﬁcation Hamed Ketabdar, Jonas Richiardi, Andrzej Drygajlo Proceedings of International Graphonomics Society 2005 Conference, Salerno, Italy, June 26-29, 2005 Abstract(.txt), paper(.pdf) • Developing and Enhancing Posterior Based Speech Recognition Systems Hamed Ketabdar, Jithendra Vepa, Samy Bengio, Herve Bourlard Proceedings of Interspeech 2005 conference, Lisbon, Portugal, 2005 Abstract(.txt), paper(.pdf) • Hierarchical Multi-Stream Posterior Based Speech Recognition System Hamed Katebdar, Herve Bourlard and Samy Bengio Machine Learning for Multimodal Interaction, Lecture Notes in Computer Science, Vol. 3869, Springler-Verlag, June, 2005 Abstract(.txt), paper(.pdf) 1999 • Handwritten Persian Digit Recognition by a Structural Method Hamed Ketabdar Conference: Document Recognition and Retrieval VI, the International Society for Optical Engineering Abstract(.txt), paper(.pdf)
Patents
Contact Details Dr. Hamed Ketabdar Deutsche Telekom Laboratories, TU Berlin Ernst-Reuter-Platz 7 10587 Berlin, Germany phone: +49 (30) 8353-58228 email: Hamed.Ketabdar@telekom.de

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