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자기 제어 토크의 수정된 선형 모델링을 적용한 위성의 모델예측제어
김종범 ( Kim Jong Bum ) 공군사관학교 2017 空士論文集 Vol.68 No.1
자장 토커는 저궤도에서 운용되는 소형위성의 자세제어에 많이 사용되는 구동기이다. 본 논문에서는 태양동기궤도에서 자장 토커만을 이용하여 천저 지향하는 위성의 자세를 제어하기 위해 선형시변 모델 예측 제어 기법을 적용하였다. 선형 시변 시스템의 제어를 위한 모델 예측 제어기는 각 단계의 운용점에 대한 온라인 선형화에 기반하여 설계되었다. 본 연구에서는 보다 정확하게 자기 제어 토크를 근사하기 위하여 테일러 급수의 첫 번째 미분항을 포함하는 새로운 선형화 기법을 제시하였으며, 선형 시변 모델 예측 제어기의 수치 시뮬레이션을 통해 제안한 새로운 선형화 기법의 효과를 확인하였다. Magnetic torquers are frequently used for the attitude control of small satellites in low-earth orbits (LEOs). In this paper, a linear time-varying model predictive control (LTV-MPC) approach for controlling a magnetically actuated nadir-pointing satellite in a sun-synchronous orbit is presented. The MPC controller is designed for LTV systems based on successive online linearization around the current operating point at each time step. This paper presents an improved linearization technique that includes first derivative terms of a Taylor series expansion for accurate approximations of the magnetic control torque. Numerical simulation results demonstrate the effectiveness of the proposed LTV-MPC formulation.
중전기기 절연용 고농도 폐 육불화황(SF<sub>6</sub>)의 플라즈마 열분해특성 및 부산물 고정화 기초 연구
김종범 ( Jong Bum Kim ),류재용 ( Jae Yong Ryu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회지 Vol.37 No.8
SF<sub>6</sub> was decomposed using the high-temperature heat generated during cement production and plasma pyrolysis, followed by the immobilization of the CaO and SF<sub>6</sub> byproducts in the kiln combustion reactor and the resource recovery; based on the results, some ways to prevent the SF<sub>6</sub> recombination, analyze the byproduct characteristics, and identify their generation path are suggested. In this study, the plasma power range from 5.9 to 10.1 kW; with increasing its value, the SF<sub>6</sub> destruction and removal efficiency also increased. When the water vapor was not added or added equivalently, the SF<sub>6</sub> byproducts were HF, F<sub>2</sub>, SO<sub>2</sub>, and SO<sub>2</sub>F<sub>2</sub>; when the water vapor was added in excess, they were only HF and SO<sub>2</sub>. Therefore, adding excessive water vapor would be appropriate to produce gypsum by immobilizing the byproducts from CaO and SF<sub>6</sub> decomposition in the cement kiln combustion reactor.
단선 터널구간에서 전동차 운행에 따른 미세먼지 농도 변화
김종범(Kim, Jong Bum),우상희(Woo, Sang Hee),황문세(Hwang, Moon Se),윤화현(Yoon, Hwa Hyeon),정준식(Jung, Joon-Sig),배귀남(Bae, Gwi-Nam) 한국도시철도학회 2017 한국도시철도학회논문집 Vol.5 No.1
Daily operation of urban railways is a major source of large particles affecting PM10 concentration in underground tunnel environments. In this study, temporal variation of PM10 and PM2.5 concentrations were measured using a DustTrak DRX aerosol monitor at the shelter located between adjacent stations on Seoul Metropolitan Railway Line 5. A one-way single tunnel section was chosen to isolate effect of train operation in opposite direction. The monitoring location was about 570 m away from the starting station, where trains traveled at the constant speed. Time-series PM10 and PM2.5 concentrations were categorized by four time periods such as no operation, morning rush-hour, midday, and evening rush-hour periods for both summer and winter. It was found that the train passing caused to increase both PM10 and PM2.5 concentrations shortly. As a result, both PM10 and PM2.5 concentrations were increased steadily during the morning and evening rush-hour periods, on the other hand they remained constantly during the midday period due to the difference in train operation interval.