Publikationen

The Powerbar - Effects of a ressource-restricting tool while solving spatial tasks on mobile devices

Montag, M. ., Bertel, S. ., de Koning, B. B., & Zander, S. . (2018). The Powerbar - Effects of a ressource-restricting tool while solving spatial tasks on mobile devices. EARLI SIG 6 & 7 Meeting (Technology-Enhanced Learning). Bonn, Germany.
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Assessing objective image quality metrics for bidirectional texture functions

Azari, B. ., Bertel, S. ., & Wüthrich, C. A. (2018). Assessing objective image quality metrics for bidirectional texture functions. 25th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG 2018). Pilsen, Czech Republic.
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Extraction of Time Dependent Physical Rotation Strategies

Wetzel, S. ., & Bertel, S. . (2018). Extraction of Time Dependent Physical Rotation Strategies. 14th biannual conference of the German Society for Cognitive Science, GK. Tübingen. Germany.
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A Comparison of Mental and Physical Rotation Using Gaze-Based Measures

Wetzel, S. ., & Bertel, S. . (2018). A Comparison of Mental and Physical Rotation Using Gaze-Based Measures. Spatial Cognition XI. Tübingen. Germany: Springer International Publishing.

Abstract

Over the past few years, a number of studies have reported on procedural similarities and differences between mental rotation and physical (i.e., manual) rotation of Shepard and Metzler-type stimuli. These similarities include comparable angular disparity effects and comparable final angular offsets in problem solving. This paper presents results from further comparisons based on gazed-derived measures obtained across the course of trials. In a within-subject design, participants solved the same tasks as mental and as physical rotation problems. We compare time courses of mean fixation duration and of saccade amplitude, and interpret these with respect to underlying mental processes and loads. The results point to additional specific procedural similarities and differences, which nicely complement the previous findings. The results are of additional, practical use for establishing how and when physical rotation can provide a useful proxy for mental rotation for purposes of process analysis, of ability assessment, and of training.
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Design Space Exploration Framework - A modular approach to flexibly explore large sets of design variants of parametric models within a single environment

Fuchkina, E. ., Schneider, S. ., Bertel, S. ., & Osintseva, I. . (2018). Design Space Exploration Framework - A modular approach to flexibly explore large sets of design variants of parametric models within a single environment. Computing for a better tomorrow - the 36th eCAADe Conference. Lodz, Poland: Lodz University of Technology.

Abstract

Parametric modelling allows to relatively easily generate large sets of design variants (so called design space). Typically, a designer intuitively moves through this design space, resulting in one or several satisfying solutions. Due to the theoretically large number of variants that can be created with parametric models, obviously, there is a high probability that potentially good solutions could be missed, which is not at least because of human cognitive limitations. Consequently, it is necessary to develop a certain strategy to support designers in order to search for design solutions. Even though, various methods to systematically approach large data sets exist, the application of them in the design process is a special case, firstly, due to the existence of many non-specifiable and subjective dimensions (e.g. aesthetics) and secondly because of the multiple ways how designers actually search for solutions. This demands for a more flexible approach to design space exploration. This paper investigates how different methods can be combined to support the exploration of design spaces. Therefore, a conceptual framework with a modular architecture is proposed and its prototypical implementation is demonstrated.
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Information Push and Pull in Tactile Pedestrian Navigation Support

von Jan, V. ., Bertel, S. ., & Hornecker, E. . (2018). Information Push and Pull in Tactile Pedestrian Navigation Support. In Proceedings of the 20th International Conference on Human-Computer Interaction with Mobile Devices and Services Adjunct (S. 55–62). New York, NY, USA: Association for Computing Machinery. http://doi.org/10.1145/3236112.3236120

Abstract

For pedestrian navigation support, we report on how the feeling of being in control about receiving updates impacts navigation efficiency and user experience. In an exploratory field study, 24 participants navigated to previously unknown targets using a wristband which conveyed tactile information about targets bearing. Information was either pulled by the user at times of her choosing via a simple arm gesture, or was pushed by the armband at a regular, preset interval. While the push mode resulted in higher efficiency, more users preferred actively pulling information, possibly as this afforded feeling more in control. Interestingly, mode preference was independent of individual navigation ability. Results suggest that properties of the specific navigation context should be used to determine whether an interface offers push or pull modes for navigation support.
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TouchScope: A Hybrid Multitouch Oscilloscope Interface

Heinz, M. ., Bertel, S. ., & Echtler, F. . (2017). TouchScope: A Hybrid Multitouch Oscilloscope Interface. In Proceedings of the 19th ACM International Conference on Multimodal Interaction (S. 269–273). New York, NY, USA: Association for Computing Machinery. http://doi.org/10.1145/3136755.3136765

Abstract

We present TouchScope, a hybrid multitouch interface for common off-the-shelf oscilloscopes. Oscilloscopes are a valuable tool for analyzing and debugging electronic circuits, but are also complex scientific instruments. Novices are faced with a seemingly overwhelming array of knobs and buttons, and usually require lengthy training before being able to use these devices productively. In this paper, we present our implementation of TouchScope which uses a multitouch tablet in combination with an unmodified off-the-shelf oscilloscope to provide a novice-friendly hybrid interface, combining both the low entry barrier of a touch-based interface and the high degrees of freedom of a conventional button-based interface. Our evaluation with 29 inexperienced participants shows a comparable performance to traditional learning materials as well as a significantly higher level of perceived usability.
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Low Cost Rapid Acquisition of Bidirectional Texture Functions for Fabrics

Azari, B. ., Wüthrich, C. A., & Bertel, S. . (2017). Low Cost Rapid Acquisition of Bidirectional Texture Functions for Fabrics. In 25th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG 2017). Plzen, Czech Republic.

Abstract

Creating photo realistic images from real word complex materials is a great challenge: the reflectance function of materials, especially fabrics, has glossy or specular highlights, reflectance anisotropy and retroreflections. This increases greatly the complexity of rendering. Bidirectional Texture Functions (BTFs), i.e. 2D textures acquired under varying illumination and viewing directions, have been used to render complex materials. However, the acquisition of textures for BTF requires up to now expensive setups and the measurement process is very timeconsuming as the directional dependent parameters (lighting and viewing directions) have to be controlled accurately. This paper will present in detail a new low cost programmable device for the rapid acquisition of BTF datasets. The device allows to acquire BTF databases at a fraction of the cost of available setups, and allows to experiment when a texture resolution and sample density increase in the parameter space is not perceivable by an observer of the renderings. The paper proves that using smaller resolution textures and decreasing the samples in parameter space does not lead to a loss of picture quality.
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Rotate It! – What eye movements reveal about solution strategies of spatial problems.

Wetzel, S. ., Krauß, V. ., & Bertel, S. . (2017). Rotate It! – What eye movements reveal about solution strategies of spatial problems. 2017 European Conference on Eye Movements (ECEM). Wuppertal, Germany.
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Demonstrating TouchScope: A Hybrid Multitouch Oscilloscope Interface

Heinz, M. ., Bertel, S. ., & Echtler, F. . (2017). Demonstrating TouchScope: A Hybrid Multitouch Oscilloscope Interface. In Proceedings of the 19th ACM International Conference on Multimodal Interaction (S. 501). New York, NY, USA: Association for Computing Machinery. http://doi.org/10.1145/3136755.3143026

Abstract

We present TouchScope, a hybrid multitouch interface for common off-the-shelf oscilloscopes. Oscilloscopes are a valuable tool for analyzing and debugging electronic circuits, but are also complex scientific instruments. Novices are faced with a seemingly overwhelming array of knobs and buttons, and usually require lengthy training before being able to use these devices productively. TouchScope uses a multitouch tablet in combination with an unmodified off-the-shelf oscilloscope to provide a novice-friendly hybrid interface, combining both the low entry barrier of a touch-based interface and the high degrees of freedom of a conventional button-based interface.
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  Bertel, Sven
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