Stefan Hillmann

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The complexity in developing and evaluating user interfaces has been extremely increased in the last few years, because more and more devices offer capabilities for multimodal interaction. This applies in particular to mobile devices like smartphones and tablet computers. An existing parameter set, aimed at describing aspects of various modalities, was(More)
Die Situation der Neurointensivmedizin in Deutschland ist trotz zahlreicher Umfragen ungeklärt. Eine Begehung von Intensivstationen mit Neurointensivmedizin sollte zur Klärung beitragen. Anlässlich von Stroke-Unit-Zertifizierungsaudits wurden 320 Intensivstationen (39 eigenständige neurologische und 20 neurochirurgische, 6 neurologisch/neurochirurgische(More)
Psychological reactance is well known in psychology and marketing, but has not yet been adopted in HCI-research. The authors aim at assessing the benefit of measuring psychological reactance in the context of usability and user experience evaluation in a HCI context. To date, there are no tools that are designed to evaluate psychological reactance in the(More)
As a complement to the 2011 ITG Guideline 2.1-01 on the evaluation of terminal devices, a new ITG guideline on the usability of smart home environments has been drafted. This guideline addresses services and applications which allow for an implicit interaction between user and system taking place in an environment equipped with networked sensors and(More)
This paper deals with the relevance of the first impression of interactive systems, based on short passive visual/auditory stimuli of system output. Individual consistency between such impressions and retrospective user ratings, obtained directly after real interaction, is studied in four exploratory experiments. All systems allow for voice user input. Two(More)
Multimodal interfaces are expected to improve input and output capabilities of increasingly sophisticated applications. Several approaches are aimed at formally describing multimodal interaction. However, they rarely treat it as a continuous flow of actions, preserving its dynamic nature and considering modalities at the same level. This work proposes a(More)
User interfaces of most data-centered software systems are oriented on the data structure of the respective application. While such interfaces work well for trained users, they are most often not suitable for non-expert users. In this paper, we present ALEX, an advisory artificial conversational agent that uses machine learning and natural language(More)