• Journal of the Korean Geotechnical Society
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• v.40 no.2
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• pp.29-40
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• 2024

This study aimed to evaluate the swelling behavior characteristics of KJ-II buffer blocks by performing numerical analysis of swelling pressure measurement experiments using the nonlinear elasticity model of COMSOL Multiphysics. The analysis was conducted under boundary conditions that included isotropic constraints and water injection pressure, mirroring the experimental settings. Validation of the numerical model was achieved by comparing its outputs with experimental results. The validated model was then used to simulate swelling deformations under unconfined conditions and to analyze swelling pressure as influenced by dry density and the geometric shape of the buffer material. The results accurately represented the swelling deformation observed during the saturation process and demonstrated that swelling pressure increases with higher dry density. Moreover, simulations concerning the geometric shape of the buffer material indicated a markedly faster rate of pressure increase in U-shaped samples compared to cylindrical ones. Analysis suggested that stress manifested preemptively near the internal edges of U-shaped samples during saturation. To enhance the simulation's fidelity to actual buffer material behavior, further refinement of the analysis model using a nonlinear elasticity model is recommended.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1718-1719
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• 2011

본 논문은 LED를 이용한 치과 치료용 장비의 모듈 제작 시뮬레이션 실험 논문이다. Auto CAD를 사용하여 모델링하며, Photo-Pia 소프트웨어로 실험을 진행 한다. LED 모듈은 직선으로 배열하며, 빛의 확산을 방지하기 위해 반사판의 모양은 타원의 형태로 제작한다. LED의 광원의 Spec. 및 반사판의 Tilt Angle 변화를 통해 기존의 치과 치료용 장비와 비교 분석을 하며, COMSOL Multiphysics를 통해 열 해석을 한다. 그 결과, 시뮬레이션을 통해 실제 제작 하지 않고 유사한 결과를 도출할 수 있다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1605_1606
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• 2009

본 논문은 LED조명기구 방열설계의 열해석에 관한 것으로서 메탈 PCB에 Chip LED를 배치하여 COMSOL Multiphysics로 시뮬레이션한 결과 LED와 PCB의 경계면 온도는 약 $80^{\circ}C$이며, PCB의 바닥면까지는 약 $50^{\circ}C$까지 변화함을 검증 하였으며, 결과적으로 실 제작의 근사치에 가까운 방열설계가 가능함이 확인되었다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1237-1238
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• 2015

이 논문은 타이어 변형량을 측정하는 변형량 센서의 시제품을 modeling하여 COMSOL Multiphysics FEM 해석 프로그램을 통해 시뮬레이션을 수행한 것을 다룬 것이다. 센서의 구조 중에 센서의 성능에 큰 영향력을 미치는 구조를 변수로 잡아 각 변수에 따른 센서의 capacitance의 linearity와 sensitivity을 시뮬레이션을 통해 도출했다. 도출한 값을 토대로 센서 구조에 대한 최적의 범위를 구하고 센서의 시제품의 구조 변수의 값이 이 범위 내에 있는 것을 보여 시제품의 성능에 대한 검증했다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.137-138
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• 2015

본 논문은 알루미늄 재질로 된 방열판을 LED조명기구에 적용해서 열 해석을 한 것으로서, PCB에 25[W]급 LED를 배치하여 COMSOL Multi-physics로 시뮬레이션 하였다. 그 결과 LED와 PCB 경계면의 온도는 $69^{\circ}C$이고, PCB바닥면의 온도는 $28^{\circ}C$로 실제작한 FR-4 재질의 LED Module과 근접한 온도임을 확인 할 수 있었다.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.40-42
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• 2020

본 논문에서는 리튬이온 배터리의 전기적인 특성 실험을 통해 열 해석에 필요한 인자를 추출하고 이를 이용하여 열 해석의 상용 프로그램인 COMSOL과 ANSYS에서 서로 다른 방법으로 열 해석을 진행한다. 두 프로그램의 열 해석을 통해 얻은 데이터와 측정 데이터를 비교분석 한 결과 유사 경향성을 확인하였고, 이를 통해 전기적 열 해석 모델의 신뢰성을 확보한다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.11a
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• pp.85-86
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• 2022

In this study, a simulation using Company A's COMSOL heat flow program was used to analyze the thermal diffusion simulation according to the depth of the high-temperature exposed cement paste. As a result of the analysis, it showed a similar relationship with the measured temperature as of 180 minutes.

• Nuclear Engineering and Technology
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• v.56 no.1
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• pp.357-357
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• 2024

• Journal of the Computational Structural Engineering Institute of Korea
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• v.28 no.1
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• pp.63-69
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• 2015

In this paper, infrared reflector design targeting infrared stealth effect is presented using structural optimization based on the phase field method. The analysis model was determined to accomplish the design that an incident infrared wave was reflected to a desired direction. The design process was to maximize the objective value at the measuring domain located in a target region and the design objective was set to the Poynting vector value which represents the energy flux. Optimization results were obtained according to the variation of some parameter values related to the phase field method. The model with a maximum objective value was selected as the final optimal model. The optimal model was modified to eliminate the gray scale using the cut-off method and it confirmed improved performance. In addition, to check the desired effect in the middle wave infrared range(MWIR), the analysis was performed by changing the input wavelength. The finite element analysis and optimization process were performed by using the commercial package COMSOL combined with the Matlab programming.

• Journal of the Korean Society of Marine Environment & Safety
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• v.17 no.4
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• pp.419-427
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• 2011

The characteristics for hydrogen production and the thermochemical properties of high temperature steam electrolysis(HTSE) device have been numerically analyzed in a two-dimension, steady-state with using the COMSOL $Multiphysics^{(R)}$. The main parameters for the calculation are applied voltage, ASR(Area-specific Resistance), temperature and pressure of the inlet gas flow. The results showed that thermal-neutral voltage was 1.2454 V and rather than the cell temperature increases or decreases with increasing applied voltage by thermal-neutral voltage starting this voltage the temperature in high voltage tended to rise and temperature in the low voltage tended to fall. And with, increasing the values of ASR, temperature inside the cell and the hydrogen production rate were decreased.