Hanyang University · Engineering
요온 교수의 연구실은 광학적 특성과 레이저 발광을 중심으로 한 유리 기반 광물질, 특히 이트륨, erbium, thulium, neodymium, praseodymium 등 희토류 도핑 유리의 광학적 특성과 레이저 특성에 대한 심층적인 연구를 수행하고 있습니다. 또한, 용접 공정의 실시간 모니터링 및 품질 평가 기술, 특히 적외선 카메라 기반 용접 풀 온도 분석과 경계 검출 기법을 활용한 용접 품질 제어 기술에 대해서도 연구를 전개하고 있습니다. 최근에는 소형 modular 원자로의 핵심 부품인 나선형 관형 증기발생기의 성형 공정에서 발생하는 스프링백 현상을 정량적으로 예측하는 분석 기법 개발에도 기여하고 있습니다.
Figures are computed from collected data and may differ slightly.
For synthesized each 1 mol% Er3+, Tm3+, and Nd3+-doped borate-rich glasses, optical and luminescence traits including fluorescence decay dynamics were explored. For Er3+: glass, at 1.4–1.65 μm range a wide NIR (near-infrared) luminescence band centered at 1.531 μm (4I13/2 → 4I15/2) and in Tm3+: glass, at 1.35–1.6 μm span a broad NIR fluorescence band centered at 1.458 μm (3H4→3F4) are obtained by 980 nm LD (laser diode) pumping (4I15/2 → 4I11/2) and 808 nm LD excitation (3H6→3H4) separately. Und
For six 1 mol% Pr3+-doped B2O3–Bi2O3–ZnO–NaF glasses consisting of single and mixed alkali oxides, optical absorption and visible and near-infrared (NIR) luminescence traits including visible fluorescence decay times were investigated. Judd–Ofelt (J‒O) analysis from absorption spectra was performed to calculate J‒O parameters Ωλ (λ = 2, 4, 6) by including and omitting 3H4 → 3P2 transition. Utilizing Ω2, Ω4, and Ω6 values and refractive indices, radiative transition probabilities (AR), branching
This paper newly proposes an efficient analytic springback prediction method to predict the final dimensions of bent cylindrical tubes for a helical tube steam generator in a small modular reactor. Three-dimensional bending procedure is treated as a two-dimensional in-plane bending procedure by integrating the Euler beam theory. To enhance the accuracy of the springback prediction, mathematical representations of flow stress and elastic modulus for unloading are systematically integrated into th
Welding quality is a critical criterion for evaluating welding operations. Traditional evaluation methods suffer from drawbacks such as lack of objectivity, untimeliness, and high costs. Therefore, real-time monitoring and assessment of the weld pool have become the mainstream trend in welding technology. This study introduces a novel method for defining weld pool width boundaries. It utilizes an infrared (IR) camera to capture the weld pool temperature clusters and employs the Sobel operator fo
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