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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.
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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
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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.
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AeroDyn을 활용한 수직축 풍력발전기의 공력해석코드 개발 및 검증
이혜빈,배윤혁 한국풍력에너지학회 2019 풍력에너지저널 Vol.10 No.1
In this research, an aerodynamic analysis code for a vertical-axis wind turbine (VAWT) was developed. The aerodynamic characteristics of the VAWT was modelled by the double multiple streamtube (DMS) model for more accurate results and faster computation time. Based on the structure of AeroDyn, developed by the NREL and used to calculate the aerodynamics of a horizontal-axis wind turbine, an in-house code was constructed and solved the aerodynamic characteristics with steady-state wind. For validation of the in-house code, a reference code called QBlade that employs the same aerodynamic model was used to calculate the aerodynamics of the VAWT. For validation of aerodynamic characteristics computed by in-house code, three characteristics of power coefficients, angle of attack and rotor torque were selected and the errors with QBlade were calculated and compared. As a result, the validity of the in-house code with an error rate of about 0.1% for the three characteristics was verified. The results of these two codes corresponded with each other despite small differences.
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이혜빈,허승재,오동렬,정배권,주상규 대한부인종양학회 2012 Journal of Gynecologic Oncology Vol.23 No.3
External-beam radiation therapy with intracavitary high-dose-rate brachytherapy is the standard treatment modality for advanced cervical cancer; however, late gastrointestinal complications are a major concern after radiotherapy. While radiation proctitis is a well-known side effect and radiation oncologists make an effort to reduce it, the sigmoid colon is often neglected as an organ at risk. Herein, we report two cases of radiation sigmoiditis mimicking sigmoid colon cancer after external-beam radiation therapy with intracavitary high-dose-rate brachytherapy for uterine cervical cancer with dosimetric consideration.
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