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1,885 results on '"In Yong, Hae"'

1. Haptic Dial based on Magnetorheological Fluid Having Bumpy Structure

Author

Lee, Seok Hun, Heo, Yong Hae, Lee, Seok-Han, and Kim, Sang-Youn

Subjects
Computer Science - Human-Computer Interaction
Abstract

We proposed a haptic dial based on magnetorheological fluid (MRF) which enhances performance by increasing the MRF-exposed area through concave shaft and housing structure. We developed a breakout-style game to show that the proposed haptic dial allows users to efficiently interact with virtual objects., Comment: Part of proceedings of 6th International Conference AsiaHaptics 2024

Published
2024

13. Quantum consistency in supersymmetric theories with $R$-symmetry in curved space

Author

An, Ok Song, Kang, Jin U, Kim, Jong Chol, and Ko, Yong Hae

Subjects
High Energy Physics - Theory
Abstract

We discuss consistency at the quantum level in the rigid $\mathcal N=1$ supersymmetric field theories with a $U(1)_R$ symmetry in four-dimensional curved space which are formulated via coupling to the new-minimal supergravity background fields. By analyzing correlation functions of the current operators in the $\mathcal{R}$-multiplet, we show that the quantum consistency with the (unbroken) supersymmetry requires the $U(1)_R$ anomaly coefficient, which depends only on the field content of the theory, to vanish. This consistency condition is obtained under the assumption that the supercurrent Ward identity is non-anomalous and that the vacuum is supersymmetric., Comment: 15 pages plus 2 appendices, published version in JHEP, minor changes, references added

Published
2019
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14. Super-Weyl Anomaly from Holography and Rigid Supersymmetry Algebra on Two-Sphere

Author

An, Ok Song, Ko, Yong Hae, and Won, Sok-Hyon

Subjects
High Energy Physics - Theory
Abstract

Operators transform anomalously under the symmetry in the presence of quantum anomalies. We study this aspect of the super-Weyl anomaly in $\mathcal N=(1,1)$ superconformal field theories (SCFTs), in the context of AdS/CFT. In particular, we carry out holographic renormalization for $(1,1)$ pure AdS$_3$ supergravity that is supposed to be a gravity dual of the $\mathcal N=(1,1)$ SCFT, and derive holographic superconformal Ward identities with corresponding anomalies. We show that the obtained super-Weyl anomaly of the $\mathcal N=(1,1)$ SCFT induces a quantum correction term in the transformation law of the supercurrent under the rigid supersymmetry. We demonstrate that the correction term does not affect the $\mathcal N=(1,1)$ rigid supersymmetry algebra on two-sphere., Comment: 17 pages

Published
2018
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17. Changes of temporomandibular joint space volume during 1 year after transoral vertical ramus osteotomy in patients with mandibular asymmetry.

Author

Bae, Sung Jun, Yong, Hae-Seong, Lee, Haneul, Kim, Hye-Sun, Huh, Jong-Ki, and Kim, Jae-Young

Subjects
*CONE beam computed tomography, *COMPUTED tomography, *OSTEOTOMY, *PROGNATHISM, *PROGNOSIS
Abstract

This retrospective study aimed to evaluate the difference in the temporomandibular joint (TMJ) space volume between the deviated (Dev) and non-deviated (NDev) side following transoral vertical ramus osteotomy (TOVRO) in patients with mandibular prognathism combined with asymmetry using reconstructed 3-dimensional images. Sixty joints from 30 patients who underwent TOVRO between January 2018 and December 2021 were included. Computed tomography (CT) or cone-beam CT was performed before surgery (T0), and 6 (T1) and 12 months postoperatively (T2). The volume of the overall joint space (Vjs) and its compartments (i.e., the anterior, posterior, medial, and lateral joint spaces) were calculated at each time point. A linear mixed model and repeated-measures covariance pattern with unstructured covariance were used. Vjs increased at T1 compared to T0 and decreased at T2 compared to T1 (p < 0.0001). Furthermore, the volume changes over time were statistically significant in all compartments (p < 0.05); however, there was no significant difference in the Vjs and its compartments between the Dev and NDev side over time (p > 0.05). Adjustments for sex and mandibular movements did not affect the results. This study can provide the basis in TMJ spatial change and predicting the prognosis after TOVRO in facial asymmetry. [ABSTRACT FROM AUTHOR]

Published
2025
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18. Symmetry breaking and effective photon mass

Author

Ko, Yong-Hae, Kim, Gwang-Il, Won, Sok-Hyon, and Kim, Nam-Chol

Subjects
Physics - Optics, High Energy Physics - Theory
Abstract

We suggest a possibility that the photon can acquire a finite mass in a medium when the external interaction and symmetry is broken on the basis of Chern-Simons gauge theory.

Published
2017

23. Scalar - Tensor gravity with scalar -matter direct coupling and its cosmological probe

Author

Kim, Jik Su, Kim, Chol Jun, Hwang, Sin Chol, and Ko, Yong Hae

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Theory
Abstract

SNIA and CMB datasets have shown both of evolving Newton's "constant" and a signature of the coupling of scalar field to matter. These observations motivate the consideration of the scalar-matter coupling in Jordan frame in the framework of scalar-tensor gravity. So far, majority of the works on the coupling of scalar matter has performed in Einstein frame in the framework of minimally coupled scalar fields. In this work, we generalize the original scalar-tensor theories of gravity introducing a direct coupling of scalar to matter in the Jordan frame. The combined consideration of both evolving Newton's constant and scalar-matter coupling using the recent observation datasets, shows features different from the previous works. The analysis shows a vivid signature of the scalar-matter coupling. The variation rate of the Newton's constant is obtained rather greater than that determined in the previous works., Comment: 13 pages, 2 figures, 2 tables

Published
2015
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40. Evolution of spatial light modulator for high‐definition digital holography

Author

Ji Hun Choi, Jae‐Eun Pi, Chi‐Young Hwang, Jong‐Heon Yang, Yong‐Hae Kim, Gi Heon Kim, Hee‐Ok Kim, Kyunghee Choi, Jinwoong Kim, and Chi‐Sun Hwang

Subjects
Digital holography, holographic panel, pixel pitch, spatial light modulator, viewing angle, Telecommunication, TK5101-6720, Electronics, TK7800-8360
Abstract

Since the late 20th century, there has been rapid development in the display industry. Only 30 years ago, we used big cathode ray tube displays with poor resolution, but now most people use televisions or smartphones with very high‐quality displays. People now want images that are more realistic, beyond the two‐dimensional images that exist on the flat screen, and digital holography—one of the next‐generation displays—is expected to meet that need. The most important parameter that determines the performance of a digital hologram is the pixel pitch. The smaller the pixel pitch, the higher the level of hologram implementation possible. In this study, we fabricated the world‐smallest 3‐μm‐pixel‐pitch holographic backplane based on the spatial light modulator technology. This panel could display images with a viewing angle of more than 10°. Furthermore, a comparative study was conducted on the fabrication processes and the corresponding holographic results from the large to the small pixel‐pitch panels.

Published
2019
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47. Flexible Vibrotactile Actuator Based on Dielectric Elastomer for Smart Handheld Devices

Author

Yong Hae Heo, Dong-Soo Choi, Do Eun Kim, and Sang-Youn Kim

Subjects
haptic display, flexible, PDMS, Ecoflex, haptic actuator, dielectric elastomer, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999
Abstract

This paper presents an electroactive and soft vibrotactile actuator based on a dielectric elastomer. The vibrotactile actuator is composed of an upper layer, an adhesive tape layer, a dielectric layer with bumps, and a lower layer. When a voltage is applied to the actuator, an electrostatic force created between the upper and lower layers pulls the upper layer down, compressing the dielectric layer. As soon as the applied voltage is released, the upper layer is quickly restored to its initial state by the elastic force of the compressed dielectric elastomer. Because two forces contribute to the actuation at the same time, the created vibration is sufficiently strong to stimulate human mechanoreceptors. When the applied voltage is removed, the upper layer and dielectric elastomer return to their initial shapes. We conducted experiments to determine the best weight ratio of polydimethylsiloxane (PDMS) and Ecoflex, and to quantitatively investigate the haptic performance of the proposed vibrotactile actuator. The experiments clearly show that the plasticized vibrotactile actuator can create a variety of haptic sensations over a wide frequency range.

Published
2021
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