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머신러닝을 활용한 유역단위 하이브리드모델 개발 및 평가
박상준 ( Sangjoon Bak ),이서로 ( Seoro Lee ),이관재 ( Gwanjea Lee ),정연지 ( Yeonji Jeong ),금동혁 ( Dong Hyuk Kum ),류지철 ( Ji Chul Ryu ),임경재 ( Kyeongjae Lim ) 한국농공학회 2023 한국농공학회 학술대회초록집 Vol.2023 No.0
다양한 수문연구에서 유량 및 수질을 모의하기 위해서 수리 수문 모델을 사용하고 있다. 유역단위 수리 수문 모델은 HSPF (Hydrological Simulation Program in Fortran), SWAT (Soil and Water Assessment Tool), L-THIA ACN-WQ (The Long-term Hydrologic Impact Assessment Model with Asymptotic Curve Number Regression Equation and Water Quality model)등 다양한 수문모델이 사용되고 있다. 하지만 유역 모델을 통한 모의는 다양한 연산 과정을 진행하여 모의까지 많은 시간이 필요하다는 단점이 있다. 이에 따라 머신러닝/딥러닝을 이용한 유출 및 수질 예측 연구가 많이 이루어지고 있다. 단순 머신러닝/딥러닝 기반 모델링 기법은 점단위인 최종유출구에서의 예측만 가능하다. 이는 하천 라우팅 등 선단위 모델링과 최적관리 기법 적용 등과 같은 면단위 모델링이 어려워 더욱 정확한 유량/수질 모의 및 유역관리 방안을 적용하기 힘들다는 문제점이 있다. 따라서 본 연구에서 머신러닝/딥러닝을 통해 일부 수문 프로세스를 대체하고 소유역별 하도추적 기법을 연계하여 유량 및 수질 항목들의 모의가 가능한 하이브리드 모델을 개발하였으며, 비점오염물질측정망(N도진)이 설치되어있는 지점의 유량을 모의하여 모델을 평가하였다. 개발된 하이브리드 모델은 머신러닝/딥러닝이 유역 모델의 일부 연산 과정을 대체하여 모의시간이 빠르며, 기존 머신러닝/딥러닝 예측 모델에서 평가가 어려웠던 유역 관리 방안 및 최적관리기법 적용 평가에도 활용이 가능할 것으로 판단이 된다.
박상준(Sangjoon Park),류완식(Wansik Ryu),송준걸(Juingeol Song),황성호(Sungho Hwang),김현수(Hyunsoo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents shift characteristics for DCT. To obtain the shift force, dynamic models of the DCT are constructed using MATLAB Simulink by considering the rotational inertia of every component. Based on the dynamic model of the DCT synchronizer, control actuator and vehicle model, a DCT simulator is developed. Using the simulator, the shift force and speed of the relevant shafts are obtained. In addition, the torque and acceleration are calculated during the shift process by considering the engaging and disengaging time of the two clutches. It is found from the simulator that non-interrupted torque transmission can be obtained by proper control of the two clutches.
박상준(Sangjoon Park),류완식(Wansik Ryu),송준걸(Jungeol Song),송세일(Seil Song),황성호(Sungho Hwang),김현수(Hyunsoo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents shifting characteristics of automated manual transmission(AMT). In order to analyze the shifting characteristics, an AMT simulator is developed by considering the clutch and shift actuator characteristics. Using the simulator, shifting performances such as clutch torque, acceleration and velocity are investigated. It is found that torque interruption occurs during the shifting, which results in negative acceleration. Shift and clutch actuator should be controlled precisely for improved shift quality.
박상준(Sangjoon Park),김민성(Minsung Kim),류완식(Wansik Ryu),송한림(Hanlim Song),김현수(Hyunsoo Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, shift characteristics of a dual clutch transmission(DCT) are investegated. DCT consists of 2 clutches. One clutch is connected with the input shaft where 1, 3, 5, R gears are attached meanwhile the other clutch is connected with another input shaft where 2, 4, 6 gears are mounted. Shift characteristics are investigated based on the dynamic models of the DCT and the synchronizer, and the simulation results are compared with the conventional manual transmission. It is found from the simulation results that the DCT provides faster shift time due to the pre-select mechanism and transmits the power during the shift. which results in the improved velolity response compared to the manual transmission.
Eun, WongJong,Ryu, HanYeol,Shin, SangJoon,Kee, YoungJung,Kim, Deog-Kwan The Korean Society for Aeronautical and Space Scie 2015 International Journal of Aeronautical and Space Sc Vol.16 No.1
In this paper, the unsteady aerodynamics and blade structural dynamics of an experimental bearingless rotor were analyzed. Due to the multiple load path and nonlinear behavior of a bearingless rotor, sophisticated structural modeling and structural-aerodynamic coupled analysis is required. To predict the internal load and deformation of an experimental bearingless rotor, trim analysis was implemented. The results showed good agreement when compared with those predicted by CAMRAD II the rotorcraft comprehensive analysis. It is possible to extend the present structural-aerodynamic combined analysis to further advanced configurations of the bearingless rotor in the future.
WongJong Eun,HanYeol Ryu,SangJoon Shin,YoungJung Kee,Deog-Kwan Kim 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.1
In this paper, the unsteady aerodynamics and blade structural dynamics of an experimental bearingless rotor were analyzed. Due to the multiple load path and nonlinear behavior of a bearingless rotor, sophisticated structural modeling and structural-aerodynamic coupled analysis is required. To predict the internal load and deformation of an experimental bearingless rotor, trim analysis was implemented. The results showed good agreement when compared with those predicted by CAMRAD II the rotorcraft comprehensive analysis. It is possible to extend the present structural-aerodynamic combined analysis to further advanced configurations of the bearingless rotor in the future.
하이브리드 DCT 차량의 성능 시뮬레이션과 동력단절 해석
송준걸(Jungeol Song),박상준(Sangjoon Park),류완식(Wansik Ryu),오경철(Kyoungcheol Oh),김현수(Hyunsoo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents shifting characteristics for a parallel hybrid electric vehicle with dual clutch transmission(DCT). In order to analyze the shifting characteristics, a HEV DCT simulator is developed. Using the simulator, shifting performance such as clutch torque, motor torque and acceleration are investigated. It is found that when the synchronizer that is connected to the motor comes out of the synchronized states to 4th and 6th gear phase, torque interruption occurs. The torque interruption should be minimized by precise motor and clutch control for improved shift quality, which requires future work.