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1,839 results on '"Kim, Do-Kyung"'

4. Non-resonant lasing in a deep-hole scattering cavity

Author

Oh, ChulMin, Ma, Ho Jin, Lee, KyeoReh, Kim, Do Kyung, and Park, YongKeun

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

Random lasers are promising in the spectral regime, wherein conventional lasers are unavailable, with advantages of low fabrication costs and applicability of diverse gain materials. However, their practical application is hindered by high threshold powers, low power efficiency, and difficulties in light collection. Here, we demonstrate a power-efficient easy-to-fabricate non-resonant laser using a deep hole on a porous gain material. The laser action in this counterintuitive cavity was enabled by nonresonant feedback from strong diffuse reflections on the inner surface. Additionally, significant enhancements in slope efficiency, threshold power, and directionality were obtained from cavities fabricated on a porous Nd:YAG ceramic.

Published
2022
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33. MP33-17 COPING WITH COMPLICATIONS THAT OCCUR AFTER PROSTATE BIOPSY FOR SATISFACTORY EVALUATION OF CALL SERVICE USING ARTIFICIAL INTELLIGENCE: A PILOT RANDOMIZED CONTROLLED TRIAL

Author

Gwon, Yong Nam, primary, Cho, Ukrae, additional, Chong, Seung Ryong, additional, Han, Ji Yeon, additional, Kim, Do Kyung, additional, Doo, Seung Whan, additional, Yang, Won Jae, additional, Kim, Kyeongmin, additional, Shim, Sung Ryul, additional, Jung, Jaehun, additional, and Kim, Jae Heon, additional

Published
2024
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45. Nanocrystalline Composite Layer Realized by Simple Sintering Without Surface Treatment, Reducing Hydrophilicity and Increasing Thermal Conductivity.

Author

Cha, Hyun‐Ae, Ha, Su‐Jin, Jang, Hye‐Jeong, Ahn, Byeong‐Min, Moon, Young Kook, Kim, Jung‐Hwan, Choi, Jong‐Jin, Hahn, Byung‐Dong, Han, Sang‐Ho, Lim, Jun, Ahn, Do‐Cheon, Jung, In Chul, Cho, Kyung‐Hoon, Kim, Do Kyung, Kim, Jae Chul, and Ahn, Cheol‐Woo

Subjects
THERMAL conductivity, SURFACE preparation, THERMAL interface materials, SINTERING, SURFACE morphology
Abstract

The surface treatment for a polymer‐ceramic composite is additionally performed in advanced material industries. To prepare the composite without a surface treatment, the simplest way to manufacture an advanced ceramic‐particle is devised. The method is the formation of a nanocrystalline composite layer through the simple liquid‐phase sintering. Using magnesia (MgO) which shows hydrophilicity, a nanocrystalline surface layer is realized by liquid‐phase sintering. The amorphous matrix of nanocrystalline composite layer makes MgO hydrophobic and ensures miscibility with polymers, and the nanocrystalline MgO ensures high thermal conductivity. In addition, the liquid phase removes the open pores and makes the surface morphology smooth MgO with smooth surface (MgO‐SM). Thermal interface materials (TIM) prepared with MgO‐SM and epoxy show a high thermal conductivity of ≈7.5 W m−1K−1, which is significantly higher than 4.5 W m−1K−1 of pure MgO TIM. Consequently, the formation process of a nanocrystalline surface layer utilizing simple liquid‐phase sintering is proposed as a fabrication method for a next‐generation ceramic‐filler. In addition, it is fundamentally identified that the thermal conductivity of MgO depends on the Mg deficiency, and therefore a poly‐crystal MgO‐SM (produced at a low temperature) has a higher thermal conductivity than a single‐crystal MgO (produced at a high temperature). [ABSTRACT FROM AUTHOR]

Published
2024
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