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Auflistung nach Autor:in "Sehrt, Jessica"

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  • Konferenzbeitrag
    From Skepticism to Acceptance: On the Dynamics of Elderly Engagement with Mixed Reality
    (Proceedings of Mensch und Computer 2024, 2024) Sehrt, Jessica; Mbamara, Ebony; Rafati, Mustafa; Schwind, Valentin
    As our society ages and technology becomes increasingly omnipresent, the use of Mixed Reality (MR) in private and health-related domains inevitably encounters the older population. This intersection presents unique challenges and opportunities for the integration of MR technology into the lives of elderlies. We conducted a qualitative study (N=7) using think-aloud interviews to gain in-depth insights into the usage of MR devices by elderly people. Using thematic analysis we identified barriers and facilitators for elderly engagement with MR: emotional response, ergonomics and handling, utility, learning competence, and acceptance. Our findings highlight the roles of timing, responsiveness, and skepticism towards the technology, which can act as a deterrent to the participation of elderlies. We contribute with a refined understanding of the elderly’s interaction with MR and recommendations for elderly-centric MR technology adoption.
  • Konferenzbeitrag
    The Negative Effect on Postural Ergonomics of Non-Sedentary Workplace Desks in Virtual Reality
    (Mensch und Computer 2022 - Tagungsband, 2022) Sehrt, Jessica; Neumann, Henrico Putra; Wenzel, Julian Niclas; Kindermann, Luca; Schwind, Valentin
    Virtual reality (VR) is gaining increasing importance in an increasing number of places in daily life, particularly when gaming or working. Moreover, immersive activities are often performed while standing at physical desks and current devices can even register the physical properties of a virtual workplace to match the virtual content with haptics in the real world in front of the user. However, little is known about the effects of VR on how users perceive and ergonomically adapt to workplace desks when wearing a head-mounted display (HMD). In this user study, we conducted an experiment with 19 participants to investigate the effects of non-sedentary VR on the postural risk level, workload, and preferred desk height. The results indicate that being in VR negatively influences objective and subjective measures of ergonomics and increases postural risk while the preferred desk height remained unaffected. We found evidence that wearing the HMD negatively affects the neck posture at non-sedentary workplace desks. We contribute with our findings and highlight the need for improving the field-of-view and weight of HMDs for lower postural risk levels at workplace desks in non-seated VR.
  • Konferenzbeitrag
    WristConduct: Biometric User Authentication Using Bone Conduction at the Wrist
    (Mensch und Computer 2022 - Tagungsband, 2022) Sehrt, Jessica; Lu, Feng Yi; Husske, Leonard; Roesler, Anton; Schwind, Valentin
    Biometric user authentication is an important factor to ensure security and privacy for personal devices. While many devices such as smartphones or laptops can be unlocked based on biometric data, smartwatches or other wrist-worn mobile devices still rely on knowledge-based schemes such as PINs or passwords. In a proof-of-concept study with 24 participants, we show that it is possible to identify individuals using sound waves passing through the wrist bones using a bone conduction speaker and a laryngophone (microphone). We tested support vector machines (SVMs) and artificial neural networks (ANNs) for binary classification. Using ANNs our method shows an authentication accuracy of 98.7%. We discuss the implications of integrating our approach into future devices and contribute with our findings in doing the first step for continuous passive user authentication at the wrist.