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실사용조건을 모사한 전차선 굽힘피로 특성평가 시스템개발
강민성(Minsung Kang),안상수(Sangsoo Ahn),구재민(Jae Mean Koo),석창성(Chang Sung Seok),이기원(Kiwon Lee),조용현(Yong Hyeon Cho) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
A Trolley line is a very important equipment among electric railway equipments since it contacts directly with pantograph and supplies electricity on the electromotive. Such it was thought that a trolley line need not to consider fatigue since the replace cycle by wear is shorter than the replace cycle by fatigue breakage. But the bending fatigue breakage accidents occurred several times at the Shinkansen trolley line in East Japan Railway Company. Therefore in case of a new developed trolley line the evaluation for bending fatigue life became more important But since there are not an authorized fatigue test method and a testing device for the trolley line the quantitative evaluation is difficult. In this study we analyzed the load and environment condition of trolley line used in the actual spot and the developed testing device that can evaluate bending fatigue properties of the trolley line as simulating the real condition. The bending fatigue test of the trolley line was achieved using the developed testing device and estimated the fatigue life of trolley line and also established the fatigue test process.
AC 전기장이 인가된 구리 전선을 통해 전파하는 화염에 대해 피복재의 두께에 따른 화염 거동에 대한 실험적 연구
강민성(Minsung Kang),유춘상(Chunsang Yoo),박정(Jeong Park),정석호(Sukho Chung),권오붕(Ohboong Kwon) 한국연소학회 2020 한국연소학회지 Vol.25 No.4
Effects of insulation thickness on flame spread over electrical copper wires with applied AC electric fields were experimentally investigated. The AC volrage and frequency varied in ranges of 0-5 kV and 10-1000 Hz, respectively. A one electrode configuration was used such that the electric potential was applied to one wire end and thus the infinite ambience could be a ground. The results showed that the flame shape and the tilting direction were significantly influnced by applied voltage and frequency. The flame spread rate decreased in an increase of insulation thickness as well as varied sensitively with applied voltage and frequency. Additionally, the molten polyethylene (PE) experienced various dynamic behaviors such as dripping of molten PE, electrospray, di-electro-phoresis, and rotation of molten PE, essentially affecting the flame spread rate. These complicated phenomena were systematically analyzed and discussed.
한반도 주요 대도시의 PM<sub>10</sub> 농도 특성 및 배출량과의 상관성 분석
강민성 ( Minsung Kang ),김유근 ( Yoo-keun Kim ),김태희 ( Taehee Kim ),강윤희 ( Yoon-hee Kang ),정주희 ( Ju-hee Jeong ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.8
This study analyzes the PM<sub>10</sub> characteristics (particulate matter with aerodynamic diameter less than 10 ㎛), concentration, and emissions in eight large South Korean cities (Seoul, Incheon, Daejeon, Daegu, Gwangju, Ulsan, Busan, Jeju). The annual median ofPM<sub>10</sub> concentration showed a decline of 0.02~1.97 ㎍/㎥ in the regions, except for Incheon, which recorded an annual 0.02 ㎍/㎥ increase. The monthly distribution levels were high in spring, winter, fall, and the summer, but were lower in summer for all regions except for Ulsan. These differences are thought to be due to the dust in spring and the cleaning effect of precipitation in summer. The variation in concentrations during the day (diurnal variation) showed that PM<sub>10</sub> levels were very high during the rush hour and that this was most extreme in the cities (10.00 and 18.00-21.00). The total annual PM<sub>10</sub> emissions analysis suggested that there had been a general decrease, except for Jeju. On-road mobile (OM) sources, which contributed a large proportion of the particulates in most regions, decreased, but fugitive dust (FD) sources increased in the remaining regions, except for Daegu. The correlation analysis between PM<sub>10</sub> concentrations and emissions showed that FD could be used as a valid, positive predictor of PM<sub>10</sub> emissions in Seoul (74.5% (p<0.05)), Dajeon (47.2% (p<0.05)), and Busan (59.1% (p<0.01)). Furthermore, industrial combustion (IC) was also a significant predictor in Incheon (61.7% (p<0.01)), and on-road mobile (OC) sources were a valid predictor in Daegu (24.8% (p<0.05)).
임베디드 NPU 환경에서 실시간 보행자 검출을 위한 네트워크 경량화 기법
강민성(Minsung Kang),임영철(Young-Chul Lim) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
딥러닝 기술의 발전으로 ADAS와 같은 기술들의 정확도가 향상되고 있지만, 고사양/고성능으로 인하여 차량용 엣지 프로세싱 환경에서 동작시키기에는 어려움이 있다. NPU와 같이 저사양 환경에서 정확도가 높으면서 실시간으로 동작하는 인지 기법들이 필요하다. 본 논문에서는 임베디드 NPU 환경에 최적화된 객체검출 네트워크를 제안한다. 경량화 backbone과 INT8 연산에 최적화된 layer로 구성된 네트워크를 제안하고, 공용 데이터셋과 자체 구축한 데이터셋에서 학습 및 평가를 진행하였다. 일반적인 학습 환경에서는 Float32 연산을 사용하고, NPU 환경에서는 INT8 연산을 사용하기 때문에 양자화 과정이 필요하다. 학습 및 테스트 결과 기존 경량화 기법 대비 복잡도는 3배 이상 감소시키면서, 검출 정확도는 향상시켰다. INT8 양자화 오차를 최소화하였으며 Float32 환경과 INT8 환경에서 검출 결과는 거의 유사하였다.
설계가능 데이터 증강 이용 설계도메인 적응 생성적 성능 최적화 방법
강민성(Minsung Kang),유영민(Yeongmin Yoo),박창규(Changkyu Park),이종수(Jongsoo Lee) (사)한국CDE학회 2021 한국CDE학회 논문집 Vol.26 No.3
Composing an experiment or a credible simulation model to search for a new optimized design may be costly in terms of both money and time as the design has not been realized yet. To alleviate this problem, we propose using Designable generative adversarial network (DGAN) to quickly suggest a new effective design. DGAN is derived from the Generative adversarial network (GAN) with the addition of an inverted generative network structure. DGAN not only augments input data but also yields the corresponding design variable data for the augmented data. Assuming a product of an analogous domain was designed in advance, its performance data is utilized with DGAN in order to adapt to a new design domain and to bring out a design that attains similar performance. The effectiveness of the proposed methodology is investigated with problems designed to incorporate equations and simulation models.