Integrating Emotional Cues into a Framework for Dialogue Management. - Hartwig Holzapfel; Christian Fügen; Matthias Denecke; Alex Waibel (ICMI, 2002)

A way out of dead end situations in dialogue systems for human-robot interaction. - Hartwig Holzapfel; Petra Gieselmann (Humanoids, 2004)

Implementation and evaluation of a constraint-based multimodal fusion system for speech and 3D pointing gestures. - Hartwig Holzapfel; Kai Nickel; Rainer Stiefelhagen (ICMI, 2004)

Tight coupling of speech recognition and dialog management - dialog-context dependent grammar weighting for speech recognition. - Christian Fügen; Hartwig Holzapfel; Alex Waibel (INTERSPEECH, 2004)

Natural human-robot interaction using speech, head pose and gestures. - Rainer Stiefelhagen; Christian Fügen; Petra Gieselmann; Hartwig Holzapfel; Kai Nickel; Alex Waibel (IROS, 2004)

A cognitive architecture for a humanoid robot: a first approach. - Catherina Burghart; Ralf Mikut; Rainer Stiefelhagen; Tamim Asfour; Hartwig Holzapfel; Peter Steinhaus; Rüdiger Dillmann (Humanoids, 2005)

Clarification questions to improve dialogue flow and speech recognition in spoken dialogue systems. - Ulf Krum; Hartwig Holzapfel; Alex Waibel (INTERSPEECH, 2005)

The "FAME" Interactive Space. - Florian Metze; Petra Gieselmann; Hartwig Holzapfel; Tobias Kluge; Ivica Rogina; Alex Waibel; Matthias Wölfel; James L. Crowley; Patrick Reignier; Dominique Vaufreydaz; François Bérard; Bérangère Cohen; et al. (MLMI, 2005)

A multilingual expectations model for contextual utterances in mixed-initiative spoken dialogue. - Hartwig Holzapfel; Alex Waibel (INTERSPEECH, 2006)

Rapid simulation-driven reinforcement learning of multimodal dialog strategies in human-robot interaction. - Thomas Prommer; Hartwig Holzapfel; Alex Waibel (INTERSPEECH, 2006)

A Robot Learns to Know People - First Contacts of a Robot. - Hartwig Holzapfel; Thomas Schaaf; Hazim Kemal Ekenel; Christoph Schaa; Alex Waibel (KI, 2006)

Coding interaction patterns between human and receptionist robot. - Catherina Burghart; Hartwig Holzapfel; R. Haeussling; S. Breuer (Humanoids, 2007)

Behavior models for learning and receptionist dialogs. - Hartwig Holzapfel; Alex Waibel (INTERSPEECH, 2007)

Enabling Multimodal Human-Robot Interaction for the Karlsruhe Humanoid Robot. - Rainer Stiefelhagen; Hazim Kemal Ekenel; Christian Fügen; Petra Gieselmann; Hartwig Holzapfel; Florian Kraft; Kai Nickel; Michael Voit; Alex Waibel (IEEE Trans. Robotics, 2007)

Confidence based multimodal fusion for person identification. - Philipp W. L. Große; Hartwig Holzapfel; Alex Waibel (ACM Multimedia, 2008)

Semantic category acquisition in dialogue for interactive object learning. - Hartwig Holzapfel; Daniel Neubig (RO-MAN, 2008)

Modelling multimodal user ID in dialogue. - Hartwig Holzapfel; Alex Waibel (SLT, 2008)

IslEnquirer: Social user model acquisition through network analysis and interactive learning. - Felix Putze; Hartwig Holzapfel (SLT, 2008)

A dialogue manager for multimodal human-robot interaction and learning of a humanoid robot. - Hartwig Holzapfel (Ind. Robot, 2008)

A dialogue approach to learning object descriptions and semantic categories. - Hartwig Holzapfel; Daniel Neubig; Alex Waibel (Robotics Auton. Syst., 2008)

Acquiring and maintaining knowledge by natural multimodal dialog. - Hartwig Holzapfel (2009)