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이중 다류관 모델을 적용한 수직축 풍력발전기 공력해석코드 개발 및 검증
이혜빈,써니 쿠마르 포구루리,배윤혁 한국풍력에너지학회 2020 풍력에너지저널 Vol.11 No.3
This research developed an aerodynamic analysis code for a vertical-axis wind turbine (VAWT) based on the structure of AeroDyn ver. 15, developed by the NREL. The aerodynamic analysis code used the double multiple streamtube model (DMSM) to describe aerodynamic characteristics, anticipating more accurate results and faster computation time. Tip-loss correction was adopted to increase the accuracy of the results. Validation was carried out by comparing the results from the developed code to the experimental and CFD analysis results. For the validation of aerodynamic characteristics computed by the developed code, power coefficient curves and rotor torque curves were chosen. The power coefficient curve predicted by the developed code showed good agreement with the experimental and CFD results. In the case of rotor torque, the developed code gave reasonable results compared to the CFD results. The differences in rotor torque were due to the secondary effects of the VAWT aerodynamics. Consequently, it was found that the developed aerodynamic analysis code can be used for the preliminary design of the VAWT, which requires fast and reasonable prediction.
초대형 반잠수식 해양 구조물의 최적 감쇠 모델에 대한 고찰
이혜빈,배윤혁,김동은,박세완,김경환,홍기용 한국해양공학회 2018 韓國海洋工學會誌 Vol.32 No.1
In order to analyze the response of the offshore structure numerically, the linear potential theory is generally applied for simplicity, and only the radiation damping is considered among various damping forces. Therefore, the results of a numerical simulation can be different from the motion of the structure in a real environment. To reduce the differences between the simulation results and experimental results, the viscous damping, which affects the motion of the structure, is also taken into account. The appropriate damping model is essential for the numerical simulation in order to obtain precise responses of the offshore structure. In this study, various damping models such as linear or quadratic damping and the nonlinear drag force from numerous slender bodies were used to simulate the free decay motion of the platform, and its characteristics were confirmed. The optimized damping model was found by comparing the simulation results to the experimental results. The hydrodynamic forces and wave exciting forces of the structure were obtained using WAMIT, and the free decay test was simulated using OrcaFlex. A free decay test of the scale model was performed by KRISO.
이혜빈,안용찬,오동률,남희림,노재명,박수연 대한암학회 2016 Cancer Research and Treatment Vol.48 No.2
Purpose The purpose of this study is to evaluate the prognostic significance of the tumor volume reduction rate (TVRR) measured during adaptive definitive radiation therapy (RT) for nasopharyngeal cancer (NPC). Materials and Methods We reviewed the RT records of 159 NPC patients treated with definitive RT with or without concurrent chemotherapy between January 2006 and February 2013. Adaptive re-planning was performed in all patients at the third week of RT. The pre- and mid-RT gross tumor volumes (GTVs) of the primary tumor and the metastatic lymph nodes were measured and analyzed for prognostic implications. Results After a median follow-up period of 41.5 months (range, 11.2 to 91.8 months) for survivors, there were 43 treatment failures. The overall survival and progression-free survival (PFS) rates at 5 years were 89.6% and 69.7%, respectively. The mean pre-RT GTV, mid-RT GTV, and TVRR were 45.9 cm3 (range, 1.5 to 185.3 cm3), 26.7 cm3 (1.0 to 113.8 cm3), and –41.9% (range, –87% to 78%), respectively. Patients without recurrence had higher TVRR than those with recurrence (44.3% in the no recurrence group vs. 34.0% in the recurrence group, p=0.004), and those with TVRR > 35% achieved a significantly higher rate of PFS at 5 years (79.2% in TVRR > 35% vs. 53.2% in TVRR ! 35%; p < 0.001). In multivariate analysis, TVRR was a significant factor affecting PFS (hazard ratio, 2.877; 95% confidence interval, 1.555 to 5.326; p=0.001). Conclusion TVRR proved to be a significant prognostic factor in NPC patients treated with definitive RT, and could be used as a potential indicator for early therapeutic modification during the RT course.
증강현실과 접목된 공공미술의 특성에 관한 연구 : 새로운 장르 공공미술의 관점에서
이혜빈,김선영 한국국제문화교류학회 2023 문화교류와 다문화교육 Vol.12 No.5
After Suzanne Lacy’s ‘New Genre Public Art’ in the 1990s, modern public art started embracing technology actively, including augmented reality (AR). AR public art merges physical and virtual elements, engaging multiple senses. This study analyzes AR public art’s attributes and potential. Using Lacy’s new genre framework, in-depth interviews were conducted for diverse insights. The analysis reveals several key points. Firstly, AR-based public art underscores ‘subjectivity’ due to viewer interaction. Secondly, it achieves ‘transcendence’, a challenge in traditional public art. Thirdly, it tackles various themes, enhancing ‘understanding’ by intuitively conveying messages. Fourthly, it’s not limited by viewing locations, expanding art access, enhancing ‘connectivity’, and fostering global unity. Fifthly, it enhances ‘playfulness’ through interactive experiences. AR-based public art offers potential to utilize synesthetic tech (sound, vibration) for inclusive art appreciation. This study advances public art, creating a platform for real-space interaction with the public
수평원기둥 파력발전장치의 시간영역 운동해석을 통한 연간 에너지 생산량 추정
이혜빈,조일형,고행식,배윤혁 한국해양환경·에너지학회 2019 한국해양환경·에너지학회지 Vol.22 No.3
본 연구에서는 불규칙 파랑중에 놓인 편심된 회전축을 갖는 수평원기둥 파력발전장치의 횡 운동 변위와 추출파워를 시간영역 해석법을 통하여 살펴보았다. Cummins(1962)가 제안한 시간영역 운동방정식을 푸는 수치방법으로 상용 프로그램인 OrcaFlex를 사용하였다. 이때 필요한 주파수영역에서의 정유체와 동유체 모멘트, 그리고 파기진 모멘트를 얻기 위하여 WAMIT 상용코드를 이용하였다. 점성에 의한 감쇠효과를 OpenFOAM 코드를 이용한 자유감쇠 수치실험을 통하여 고려하였고, 시시각각 변하는 수평원기둥의 잠긴 형상 변화에 따른 비선형 정유체 모멘트의 효과도 함께 살펴보았다. 시간영역 해석법을 제주 차귀도 해역에서 취득한 유의파고와 피크주기로 나타나는 파랑산포도에 적용하여 파워매트릭스를 구하고 이로부터 연간 에너지 생산량을 추정하였다. In this study, the roll motion and extracted power of the horizontal cylinder wave energy converter with eccentric rotation axis were investigated by time-domain analysis. The equation of motion in time-domain, proposed by Cummins (1962), was solved using OrcaFlex commercial code. Herein, the hydrostatic moment, wave exciting moment and hydrodynamic moment in frequency-domain were calculated from the WAMIT commercial code. The viscous damping coefficients were obtained from the free-decay numerical tests using OpenFOAM. In addition, the nonlinear hydrostatic moment due to the changing submerged shape of a rotor was also considered. The numerical tool of time domain analysis was applied to the wave scatter diagram represented by significant wave height and peak period, measured at Jeju Chagwi-do site and the corresponding power matrix was obtained. Finally, the annual energy production was estimated.