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Auflistung nach Autor:in "Stadler, Patrick"

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  • Konferenzbeitrag
    DispLagBox: simple and replicable high-precision measurements of display latency
    (Mensch und Computer 2020 - Tagungsband, 2020) Stadler, Patrick; Schmid, Andreas; Wimmer, Raphael
    The latency of a computing system affects users' performance. One important component of end-to-end latency is display lag - the time required to turn framebuffer contents into photons emitted by a computer screen. However, there is no well-documented and widely available method for measuring display lag. Thus, the effect of display lag is rarely considered in scientific studies and system development. We developed DispLagBox, a simple open-source device for measuring display lag. It supports the International Display Measurements Standard but also offers additional metrics for characterizing display lag with a resolution of 0.1 ms. The device, based on a Raspberry Pi computer, measures the time between VSYNC and a change in brightness on the connected display. Repeated measurements can be conducted automatically, so that not only average latency but also latency distributions for each device can be reported. For most displays we tested, DispLagBox reports latencies that are close to those reported by a commercial black-box measurement device. Typically, the difference is 1 - 3 ms.
  • Konferenzbeitrag
    Fake it and Let Them Make it: Combining Wizard-of-Oz and Rapid Prototyping Tools for a Holistic Co-Design of Conversational User Interfaces
    (Mensch und Computer 2023 - Tagungsband, 2023) Stadler, Patrick; Bawa, Vanshika
    Developing and evaluating chatbots can be a costly and resource-intensive endeavor, often only addressing the preferences of final stakeholders at the very late stage. This paper presents an innovative approach that leverages chatbot simulations within a co-design framework to involve users early on. The proposed methodology aims to enable comprehensive evaluation of chatbot aspects without the need for users to download an app. The integration of a Wizard-of-Oz (WoZ) tool with WidgetExplorer, our proposed chatbot prototyping and evaluation tool, is introduced as a platform for rapid prototyping and user-centered evaluation. This iterative process facilitates contextual conversations, reflection, and dynamic adjustments to the dialog flow and its appearance. Furthermore, the paper presents the incorporation of visual UI components using AdaptiveCards Designer. Using this approach could lead to improving efficiency, inclusivity, and transparency in chatbot design and evaluation.