Browsing by Author "Nakamura, Fumihiko"

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    An Integrated Ducted Fan-Based Multi-Directional Force Feedback with a Head Mounted Display
    (The Eurographics Association, 2022) Watanabe, Koki; Nakamura, Fumihiko; Sakurada, Kuniharu; Teo, Theophilus; Sugimoto, Maki; Hideaki Uchiyama; Jean-Marie Normand
    Adding force feedback to virtual reality applications enhances the immersive experience. We propose a prototype, featuring head-based multi-directional force feedback in a virtual environment. We designed the prototype by integrating four ducted fans into a head-mounted display. Our technical evaluation of the ducted fan revealed the force characteristics of the ducted fan, including presentable power, sound level, and latency. In the first part of our study, we investigated the minimum force that a user can perceive in different directions (forward/backward force; up/down/left/right rotational force). The result suggested the absolute detection threshold for each directional force. Following that, we evaluated the impact of using force feedback through an immersive flight simulation in the second part of our study. The result indicates that our technique significantly improved user enjoyment, comfort, and visual-and-tactile perception, and reduced simulator sickness in an immersive flight simulation.
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    The Sense of Agency, Sense of Body Ownership with a Semi-autonomous Telexistence Robot under Shared / Unshared Intention Conditions
    (The Eurographics Association, 2022) Takechi, Tohru; Nakamura, Fumihiko; Fukuoka, Masaaki; Ienaga, Naoto; Sugimoto, Maki; Theophilus Teo; Ryota Kondo
    With the increasing popularity of robots such as teleoperated semi-autonomous robots, sense of agency (SoA) and sense of body ownership (SoBO) with semi-autonomous robots is becoming increasingly important. This study investigates the changes in the SoA and SoBO when the user control weight of the robot is altered in human-robot collaboration. Through an experiment, we compared the SoA and SoBO in a pick-and-place task using a robotic arm under the conditions in which the autonomous robotic arm shared and unshared the target with the participant. The results showed that the SoA and the SoBO increased with the increase of user control weight. However, the user control weight of 75% achieved a slightly higher SoA than that of 100%.
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    WeightSync: Proprioceptive and Haptic Stimulation for Virtual Physical Perception
    (The Eurographics Association, 2020) Teo, Theophilus; Nakamura, Fumihiko; Sugimoto, Maki; Verhulst, Adrien; Lee, Gun A.; Billinghurst, Mark; Adcock, Matt; Argelaguet, Ferran and McMahan, Ryan and Sugimoto, Maki
    In virtual environments, we are able to have an augmented embodiment with various virtual avatars. Also, in physical environments, we can extend the embodiment experience using Supernumerary Robotic Limbs (SRLs) by attaching them to the body of a person. It is also important to consider for the feedback to the operator who controls the avatar (virtual) and SRLs (physical). In this work, we use a servo motor and Galvanic Vestibular Stimulation to provide feedback from a virtual interaction that simulates remotely controlling SRLs. Our technique transforms information about the virtual objects into haptic and proprioceptive feedback that provides different sensations to an operator.