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Your search keyword '"Amemiya, Tomohiro"' showing total 349 results
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349 results on '"Amemiya, Tomohiro"'

3. Ankle tendon electrical stimulation to enhance sensation of walking on a slope in walking-in-place.

Author

Ota, Takashi, Matsumoto, Keigo, Aoyama, Kazuma, Amemiya, Tomohiro, Narumi, Takuji, and Kuzuoka, Hideaki

Abstract

This study aimed to develop an effective VR locomotion technique for walking through virtual environments with sloped ground. Thus, this paper presents a novel method for inducing the sensation of walking on a slope in walking-in-place (WIP) using ankle tendon electrical stimulation (TES), which induces the body tilt sensation. We conducted two experiments to evaluate the effectiveness of the proposed method. In Experiment 1, we evaluated the sensation of ascending and descending slopes induced by the proposed method in a setup where electricity flows when the feet are grounded by comparing it to the sensation on a real slope. Experiment 1 demonstrated a marginally significant effect of electrical stimulation on the sensation of ascending or descending slopes. We attributed this to the short duration of ankle TES and the influence of the user's interpretation of the ankle TES. Based on the findings, Experiment 2 was conducted in a setup where ankle TES was constantly applied. The results indicated that participants who focused on the subjective body tilt sensation elicited by TES and those unaware of the TES effect experienced an ascending sensation with an anterior ankle TES and a descending sensation with a posterior ankle TES. Conversely, those who focused on the tactile or force sensation induced by ankle TES experienced the opposite effect. Based on this finding, we have constructed an implementation guide for a WIP system that incorporates ankle TES to present the desired sensation of ascending or descending slopes in virtual environments. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Optical ReLU using membrane lasers for an all-optical neural network

Author

Takahashi, Naoki, Fang, Weicheng, Xue, Ruihao, Okada, Sho, Ohiso, Yoshitaka, Amemiya, Tomohiro, and Nishiyama, Nobuhiko

Subjects
Atomic and Molecular Physics, and Optics
Abstract

In this study, we propose low power consumption, programmable on-chip optical nonlinear units (ONUs) for all-optical neural networks (all-ONNs). The proposed units were constructed using a III-V semiconductor membrane laser, and the nonlinearity of the laser was used as the activation function of a rectified linear unit (ReLU). By measuring the relationship of the output power and input light, we succeeded in obtaining the response as an activation function of the ReLU with low power consumption. With its low-power operation and high compatibility with silicon photonics, we believe that this is a very promising device for realizing the ReLU function in optical circuits.

Published
2022

14. Leveraging Tendon Vibration to Extend Pseudo-Haptic Sensations in VR

Author

Hirao, Yutaro, Amemiya, Tomohiro, Narumi, Takuji, Argelaguet, Ferran, and Lécuyer, Anatole

Subjects
FOS: Computer and information sciences, H.5.2, FOS: Biological sciences, Quantitative Biology - Neurons and Cognition, I.3.7, Computer Science - Human-Computer Interaction, Neurons and Cognition (q-bio.NC), Human-Computer Interaction (cs.HC)
Abstract

The Pseudo-haptic technique is used to modify haptic perception by appropriately changing visual feedback to body movements. Because tendon vibration can affect our somatosensory perception, we propose a method for leveraging tendon vibration to extend pseudo-haptics. To evaluate the proposed method, we conducted three experiments that investigate the effect of tendon vibration on the range and resolution of pseudo-haptic sensation. The first experiment evaluated the effect of tendon vibration on the detection threshold (DT) of visual/physical motion discrepancy. The results show that vibrations on the inner tendons of the wrist and elbow increased the DT. This indicates that tendon vibration can increase applicable visual motion gain without being noticed by users. The second experiment investigated the effect of tendon vibration on the resolution, that is, the just noticeable difference (JND) of pseudo-weight sensation. The results indicate that both with- and without-vibration conditions had a similar JND of pseudo-weight sensation and thus, both conditions can be considered to have a similar resolution of sense of weight. The third experiment investigated the equivalence between the weight sensation induced by tendon vibration and visual motion gain, that is, the point of subjective equality (PSE). The results show that vibration increases the sense of weight, and its effect was the same as that using a gain of 0.64 without vibration. Taken together, our results suggest that using tendon vibration can enable a significantly wider (nearly double) range of pseudo-haptic sensation, without impairing its resolution., This paper has been submitted to IEEE TVCG

Published
2022

39. Nonreciprocal polarization converter consisting of asymmetric waveguide with magnetooptic cladding: theory and simulation

Author

Amemiya, Tomohiro, Tanemura, Takuo, and Nakano, Yoshiaki

Subjects
Gallium arsenide -- Magnetic properties, Gallium arsenide -- Electric properties, Indium -- Electric properties, Indium -- Magnetic properties, Integrated circuits -- Design and construction, Semiconductor chips -- Design and construction, Yttrium -- Electric properties, Yttrium -- Magnetic properties, Cerium -- Electric properties, Cerium -- Magnetic properties, Standard IC, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A nonreciprocal polarization converter compatible with InP-based photonic integrated circuits is described, where the device consists of an asymmetric InGaAsP waveguide combined with a ferromagnetic cerium-substituted yttrium iron garnet layer. The nonreciprocal conversion of the polarization state is used in the waveguide and a nonreciprocal TE-TM conversion efficiency of 93% is obtained with a device length of 0.27 nm.

Published
2009

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