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Auflistung nach Schlagwort "user study"

1 - 10 von 18
  • Konferenzbeitrag
    A Comparison of Spatial Grouping Techniques on Interactive Surfaces
    (Mensch & Computer 2012: interaktiv informiert – allgegenwärtig und allumfassend!?, 2012) Höchtl, Anita; Geyer, Florian; Reiterer, Harald
    In this paper we report a comparative study investigating two interaction techniques for grouping items spatially on a tabletop interface. We compared a container technique with a proximity technique. The container concept was considered due to its familiarity with desktop systems, while the proximity technique is a novel organic concept based on spatial proximity. Our goal was to identify the characteristics of both techniques in regard to grouping and regrouping performance, grouping strategies as well as bimanual and multi-finger input. Our results indicate that the traditional container concept may not be an adequate fit for harnessing the benefits of interactive surfaces. Rather, our study shows that more informal spatial techniques based on proximity open up a promising design space for further investigations.
  • Konferenzbeitrag
    A User Interface Concept for Context-Aware Recommender Systems
    (Mensch und Computer 2016 - Tagungsband, 2016) Hiesel, Patrick; Wörndl, Wolfgang; Braunhofer, Matthias; Herzog, Daniel
    A context-aware recommender system incorporates the knowledge of different contextual factors - such as time or weather information - to improve the item suggestions made to a user. While this provides great benefit to users, it might be hard for them to grasp why certain items are relevant, given the complexity of a context-aware recommender. In this paper, we propose, implement and evaluate a user interface concept that seeks to tackle this challenge. We show how popularity graphs can be used to inform the user about the relevance of items in different contexts and how users perceive different contextual factors given our concept. A user study with 14 participants demonstrates that our concept is valid and appreciated by users.
  • Konferenzbeitrag
    Adaptation and Evaluation of a Virtual Classroom for Blind Users
    (i-com: Vol. 16, No. 1, 2017) Karlapp, Marlene; Köhlmann, Wiebke
    Digital media offers multiple possibilities for inclusion of people with disabilities. Nevertheless, they pose barriers especially for blind learners as they hinder an active participation in synchronous learning settings. Virtual classrooms are a particularly good example for a complex media application as they combine various media types such as audio, video, graphical content and text which can only partially be perceived.Our work pursues the goal to facilitate an equal participation in virtual classrooms for blind users. In order to overcome these barriers, alternative user interface concepts for the display on a two-dimensional tactile Braille device have been conceived. Based on these concepts, the virtual classroom solution was improved thereupon. A subsequent evaluation simulated a learning session with blind users in order to determine the acceptance and usability of the software adaptation. This user study shows that an active participation of blind learners in virtual classroom sessions can be achieved by using multimodal output devices and alternative concepts.
  • Workshopbeitrag
    Adaptive Dark Mode: Investigating Text and Transparency of Windshield Display Content for Automated Driving
    (Mensch und Computer 2019 - Workshopband, 2019) Riegler, Andreas; Riener, Andreas; Holzmann, Clemens
    Windshield displays are a promising technology for automotive application. In combination with the emergence of highly automated vehicles, chances are that work-related activities will become more popular on the daily commute to and from work. While windshield displays can show content relevant for non-driving related activities, little information is available on how potential users would utilize these displays in terms of text and background color as well as transparency usage. In this paper, we present the results of two user studies (pilot study: N = 10, main study: N = 20) addressing this issue. Findings from quantitative measurements and qualitative pre-/post study surveys and interviews suggest a strong preference for the chat window being located on the driver side presented in dark mode with adaptive background transparency levels based on the luminance of the outside environment.
  • Workshopbeitrag
    Argumentative explanations for recommendations - Effect of display style and profile transparency
    (Mensch und Computer 2020 - Workshopband, 2020) Hernandez-Bocanegra, Diana Carolina; Ziegler, Jürgen
    Providing explanations based on user reviews in recommender systems may increase users’ perception of transparency. However, little is known about how these explanations should be presented to users in order to increase both their understanding and acceptance. We present in this paper a user study to investigate the effect of different display styles (visual and text only) on the perception of review-based explanations for recommended hotels. Additionally, we also aim to test the differences in users’ perception when providing information about their own profiles, in addition to a summarized view on the opinions of other users about the recommended hotel. Our results suggest that the perception of explanations regarding these aspects may vary depending on user characteristics, such as decision-making styles or social awareness.
  • Konferenzbeitrag
    BinarySwipes: Fast List Search on Small Touchscreens
    (Mensch und Computer 2019 - Tagungsband, 2019) Hartmann, Johannes; Schirmer, Maximilian; Echtler, Florian
    Smartwatches and other wearables generally have small screens, thereby complicating touch-based interaction. Selection from a long list, e.g. to locate a contact or a music track, is particularly cumbersome due to the limited interaction space. We present BinarySwipes, an interaction technique based on binary search which is designed to speed up list search tasks on space-constrained screens. We evaluate a prototypical implementation of BinarySwipes on a smartwatch. Results from our evaluation with 21 participants show improved performance over a plain linear search on lists with 100, 200, and 500 entries, but also increased mental load on the users.
  • Konferenzbeitrag
    Conveying perspective in multi-user virtual reality collaborations
    (Mensch und Computer 2020 - Tagungsband, 2020) Freiwald, Jann Philipp; Diedrichsen, Lennart; Baur, Alexander; Manka, Oliver; Jorshery, Pedram Berendjy; Steinicke, Frank
    Effectively conveying the users' visual point of view in a collaborative virtual reality environment is a crucial factor in successful and efficient cooperation. Visual indicators of users' perspectives can reduce the required verbal communication and therefore increase the efficiency of work within remote teams. In this paper we compare three distinct types of visual indicators regarding task completion time, precision and error rate. These perspective conveying methods include a 3D cone indicating the boundaries of a user's field of view, highlighting the object a user is looking at, and displaying a direct video mirror of the user's view port. In an experiment these methods were used to transmit information from one person to another, that would otherwise be inaccessible. In a virtual warehouse scenario, participants moved visually obstructed boxes to a target area with a crane, while an experiment conductor provided visual cues as to where these boxes are, solely by looking at them. The results indicate that object highlighting is significantly inferior regarding precision and error rate, while the video mirror proved to be the most reliable. The view cone was however perceived as the method with the highest degree of social presence.
  • Workshopbeitrag
    Evaluating a Smart Car Interface in Terms of Usability, User Experience and User Acceptance
    (Mensch und Computer 2021 - Workshopband, 2021) Avramidis, Mario; Kellner, Christiane; Staudt, Josefine; Zimmermann, Verena; Gerber, Nina
    Although the automation of cars aims to facilitate driving, current systems still rely on the driver for handling critical driving situations. As long as fully automatic systems are not available, the driver has to be supported in the take-over maneuver. We thus propose an interface that relies on auditory and visual signals to support the take-over process. Our interface further provides assistance for driving in poor visibility conditions, such as bad weather or darkness, by highlighting other traffic participants and lane boundaries. An online evaluation of our interface with 22 participants indicates a good usability, user experience, and acceptance.
  • Zeitschriftenartikel
    Explaining Review-Based Recommendations: Effects of Profile Transparency, Presentation Style and User Characteristics
    (i-com: Vol. 19, No. 3, 2021) Hernandez-Bocanegra, Diana C.; Ziegler, Jürgen
    Providing explanations based on user reviews in recommender systems (RS) may increase users’ perception of transparency or effectiveness. However, little is known about how these explanations should be presented to users, or which types of user interface components should be included in explanations, in order to increase both their comprehensibility and acceptance. To investigate such matters, we conducted two experiments and evaluated the differences in users’ perception when providing information about their own profiles, in addition to a summarized view on the opinions of other customers about the recommended hotel. Additionally, we also aimed to test the effect of different display styles (bar chart and table) on the perception of review-based explanations for recommended hotels, as well as how useful users find different explanatory interface components. Our results suggest that the perception of an RS and its explanations given profile transparency and different presentation styles, may vary depending on individual differences on user characteristics, such as decision-making styles, social awareness, or visualization familiarity.
  • Workshopbeitrag
    Fallstudien zur Alltagsrelevanz von Zeit- und Kalenderkonzepten
    (Mensch und Computer 2016 - Tagungsband, 2016) Cyra, Katharina; Amrhein, Antje; Pitsch, Karola
    Basierend auf zwei Fallstudien werden erste Ergebnisse zu alltäglichen Zeit- und Kalenderkonzepten beim Terminmanagement von Menschen mit Unterstützungsbedarf beschrieben. Ausgehend von einer Interaktionsstudie mit einem Embodied Conversational Agent (ECA), in dem die Diskrepanz zwischen den Zeitkategorien des technischen Systems und denen der Nutzer hervortritt, werden auf Basis ethno-graphischer Feldforschung anhand zweier Fallstudien von Menschen mit kognitiven Einschränkungen die im Alltag relevanten Zeitkategorien dargestellt. Die Daten bieten erste Ansätze zur Formulierung von Implikationen für das Design des technischen Assistenzsystems hinsichtlich Kalender-Design, Übersetzerfunktion und Integration in das menschliche Unterstützungsnetzwerk.