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Yusuke Ujitoko

Researcher

NTT CS Labs (2020-)

Biography

Yusuke Ujitoko is a researcher of NTT Communication Science Laboratories since October 2020. He used to be a member of R&D Group in Hitachi, Ltd from April 2016 to September 2020. He received PhD. in engineering at the University of Electro-Communications, Japan in 2020. He received a B.E. degree in mechanical engineering and M.A.E. degree in inter-disciplinary information studies from the University of Tokyo, Japan in 2014 and 2016. His research interests include applied haptic perception and haptic interfaces.

Interests

  • Haptic Design
  • Haptic Presentation
  • Haptic Augmentation

Education

  • Ph.D, Graduate School of Information Systems,, 2020

    The University of Electro-Communications

  • M.A.Sc., Graduate School of Interdisciplinary Information Studies, 2016

    The University of Tokyo

  • B.E., Faculty of Engineering, Department of Mechanical Engineering, 2014

    The University of Tokyo

Projects

What People Want to Touch in Daily Life

In this study, we tried to gain insights into targets people want to touch in their daily lives by conducting a Twitter survey wherein we collected a considerable amount of Japanese Twitter posts (tweets) containing references to the desire for touch.

Impact Vibration Localization

This study investigated the localization ability of an impulse vibration source outside the body in two-dimensional space. We tested whether humans can recognize the direction or distance of an impulse vibration source when using their hand to detect spatiotemporal vibrotactile information provided by the propagated vibrational wave from the source.

Inside Touch

This study attempts to provide a tactile feeling on the space inside a virtual object when fingers penetrate it. We attempt to present the tactile impression of “Rough,” “Grainy,” and “Sparse” which correspond to Japanese onomatopoeia of “Zara-Zara,” “Tsubu-Tsubu,” or “Chiri-Chiri” with simple patterned stimuli arranged in 3D space.

Survey of Pseudo Haptics

In this paper, findings from a series of individual prior studies were summarized from the design through to the application proposals. First, we summarize visual stimuli designs based on the target haptic object properties to induce pseudo-haptics. Second, we summarize two special issues when designing pseudo-haptics. Third, application proposals that use pseudo-haptics for training, assistance, and entertainment are presented.

High Density Pin Arrays

This study proposes a novel design of a finger-mounted pin-array display that works around the constraint. We adopted a pneumatic drive because the pneumatic actuator, or air cylinder, can be a simple structure and can be arranged in a dense array. Our developed finger-mounted display has a higher contact point density and a larger coverage area than any other previously developed devices.

Pseudo-haptic Roughness on Finger

Previously, we proposed a pseudo-haptic method of changing the perceived roughness of virtual textured surfaces represented by vibrational feedback during pen-surface interaction. This study extends the method to finger-surface interactions in order to change the roughness judgment of real surface. Users watched computer-generated visual oscillations of the contact point while exploring the texture using bare fingers.

Vibrator Transparency

We define the ‘‘vibrator transparent system’’ as a control system that absorbs the difference in vibrator environments' frequency characteristics. Therefore, with this system, it is possible to reproduce the output vibration by only reusing the input signals from vibrotactile signal assets.

Pseudo-haptic Friction

In this study, we propose a new method for presenting static frictional sensation using the pseudo-haptic effect as a first attempt, which is the simplest implementation of presenting static friction sensation.

GAN-based Vibrotactile Design

We propose a new generative model that realizes the vibrotactile generation automatically based on texture images or material attributes. Our method can stop wasting time for hand-tuning vibrotactile signals and it promotes the rapid-design of vibrotactile signals.

Simulating Wearable Pin-array Display

We prepared a real testing environment where the user touched the real object, and where we could simulate both the sparse contact point and the penetration on the shape recognition.

Pseudo-haptic Roughness

We focus on fine roughness perception and we propose a method using a pseudo-haptic effect to modulate fine roughness perception of vibrotactile texture

Pseudo-haptics on Touchscreen

We proposes a method that renders haptic perceptions only using a touchscreen based on visuo-haptic interaction. The method evokes a feeling of resistive force by creating a discrepancy between the movement of the finger during swiping the screen and the background image.