Quality and Usability Lab

9 Items

Recent Submissions
Psychological needs as motivators for security and privacy actions on smartphones

Kraus, Lydia ; Wechsung, Ina ; Möller, Sebastian (2017-06)

Much work has been conducted to investigate the obstacles that keep users from using mitigations against security and privacy threats on smartphones. By contrast, we conducted in-depth interviews (N = 19) to explore users’ motivations for voluntarily applying security and privacy actions on smartphones. Our work focuses on analyzing intrinsic motivation in terms of psychological need fulfillmen...

Object-based audio reproduction and the audio scene description format

Geier, Matthias ; Ahrens, Jens ; Spors, Sascha (2010)

The introduction of new techniques for audio reproduction such as HRTF-based technology, wave field synthesis and higher-order Ambisonics is accompanied by a paradigm shift from channel-based to object-based transmission and storage of spatial audio. Not only is the separate coding of source signal and source location more efficient considering the number of channels used for reproduction by la...

Evaluating embodied conversational agents in multimodal interfaces

Weiss, Benjamin ; Wechsung, Ina ; Kühnel, Christine ; Möller, Sebastian (2015)

Based on cross-disciplinary approaches to Embodied Conversational Agents, evaluation methods for such human-computer interfaces are structured and presented. An introductory systematisation of evaluation topics from a conversational perspective is followed by an explanation of social-psychological phenomena studied in interaction with Embodied Conversational Agents, and how these can be used fo...

Gesture-based user authentication on mobile devices using accelerometer and gyroscope

Guse, Dennis (2017)

Mobile devices offer their users lots of possibilities and a feeling of freedom. However, this freedom comes along with new security threats. Sensitive data might be stolen and abused, if an unauthorized person gets unrestricted access to such devices. Therefore, user authentication mechanisms are required. So far authentication mechanisms like PINs and passwords do not take into account the li...

Matlab Scripts for the Book "Analytic Methods of Sound Field Synthesis"

Ahrens, Jens (2012-06-01)

The present Matlab scripts accompany the book "Analytic Methods of Sound Field Synthesis" by Jens Ahrens. Usage instructions can be found here: http://www.soundfieldsynthesis.org/matlab/

The sum of two models: how a composite model explains unexpected user behavior in a dual-task scenario

Halbrügge, Marc ; Russwinkel, Nele (2016)

Maintaining cognitive control while pursuing several tasks at the same time is hard, especially when the current problem states of these tasks need to be represented in memory. We are investigating the mutual influence of a self-paced and a reactive task with regard to completion time and error rates. Against initial expectations, the interruptions from the reactive task did not lead to more er...

Towards the evaluation of cognitive models using anytime intelligence tests

Halbrügge, Marc (2016)

Cognitive models are usually evaluated based on their fit to empirical data. Artificial intelligence (AI) systems on the other hand are mainly evaluated based on their performance. Within the field of artificial general intelligence (AGI) research, a new type of performance measure for AGI systems has recently been proposed that tries to cover both humans and artificial systems: Anytime Intelli...

ACT-R Model for Predicting Performance in the DSF Task

Halbrügge, Marc (2009-07-25)

Dynamic Stock Flow (DSF) problems are a well-established paradigm for research on human decision making under uncertainty. This cognitive model implements a theoretic account on how humans solve DSF problems using the cognitive architecture ACT-R.

Simulation des Interaktionsverhaltens von Senioren bei der Benutzung von mobilen Endgeräten

Schulz, Matthias (2016)

Das Ziel dieser Arbeit ist es, eine bestehende Software zur Automatischen Usability Evaluierung (AUE) dahingehend zu erweitern, dass demografische Verteilungen über Einschränkungen in der älteren Bevölkerung in den Simulationsprozess einfließen und Auswirkungen von fehlenden oder unpassenden mentalen Modellen des Eingabegerätes simuliert werden können. Die vorliegende Arbeit dokumentiert den ak...