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도시철도 전동차 유지보수체계의 특징 및 운영방식에 관한 연구
김규중(Kim Kyu-Joong),차준일(Cha Joon-Il),김주용(Kim Ju-Yong),이진원(Lee Jin-Won),이근오(Lee Keun-Oh) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Urban transit system must secure fast, safe and reliable transportation capacity as a metropolitan mass transit. For this purpose, it is important to make all the sub-systems (which consist of EMU, power feeding, signalling & telecommunication, railway, platform facility, and control system and so on) work well. To operate all the systems effectively and reliably, a maintenance measure optimal to each system's characteristics is need to be established and executed. So highly reliable maintenance is need to be performed. But, EMU maintenance methods suitable to its own model and EMU's line are not introduced yet. This study examined a few example mainly to secure reliability on a maintenance quality in operating method and feature of train maintenance system based on travel distance.
자동운전 차량의 정위치 정차율 향상을 위한 시스템 기능 개선 및 시험 방안에 관한 연구
이경복(Lee Kyoung-Bok),이희선(Lee Heui-Seon),차준일(Cha Joon-il),김규중(Kim Kyu-Joong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
This paper describes the method of how to improve the probability of the tracing stopping ratio which is the most important factor in Automatic Train Operation (ATO). Aspects of improving the performance of automatic driving, the followings are investigated and studied : the interface between the signal system and the vehicle, the need to improve braking system, test method of blending brakes, how to minimize the delay of commands for real-time control. In this study, we applied this method to prove the effectiveness in DAEJEON LINE1.
에너지저장시스템의 충, 방전 Auto Level-Tuning 알고리즘에 관한 연구
백승길(Seoung-Gil Baek),임지영(Ji-Young Lim),차준일(Joon-il Cha),김길동(Kil-Dong Kim),권경민(Kyoung-Min Kwon) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
This paper is about control algorithms that bi-direction DC-DC Converter using Super Capacitor and regenerative power from DC feeding system in train. In order to take advantage of regenerative energy efficient, charge and discharge level value of energy storage system serve as an important factor. Respect to output fluctuations of the substation and catenary voltage changing, we offers Charge-Discharge Auto Level Tuning Algorithms to improve system following of Energy Storage System.
지역간 상대위험도 변동을 고려한 미세먼지 기인 질병부담 및 사회경제적 비용 추정 연구
변가람(Garam Byun),최용수(Yongsoo Choi),길준수(Junsu Gil),차준일(Junil Cha),이미혜(Meehye Lee),이종태(Jong-Tae Lee) 한국환경보건학회 2021 한국환경보건학회지 Vol.47 No.5
Background: Particulate matter (PM) is one of the leading causes of premature death worldwide. Previous studies in South Korea have applied a relative risk calculated from Western populations when estimating the disease burden attributable to PM. However, the relative risk of PM on health outcomes may not be the same across different countries or regions. Objectives: This study aimed to estimate the premature deaths and socioeconomic costs attributable to longterm exposure to PM in South Korea. We considered not only the difference in PM concentration between regions, but also the difference in relative risk. Methods: National monitoring data of PM concentrations was obtained, and missing values were imputed using the AERMOD model and linear regression model. As a surrogate for relative risk, hazard ratios (HRs) of PM for cardiovascular and respiratory mortality were estimated using the National Health Insurance Service- National Sample Cohort. The nation was divided into five areas (metropolitan, central, southern, southeastern, and Gangwon-do Province regions). The number of PM attributable deaths in 2018 was calculated at the district level. The socioeconomic cost was derived by multiplying the number of deaths and the statistical value of life. Results: The average PM₁₀ concentration for 2014~2018 was 45.2 μg/㎥. The association between long-term exposure to PM10 and mortality was heterogeneous between areas. When applying area-specific HRs, 23,811 premature deaths from cardiovascular and respiratory disease in 2018 were attributable to PM₁₀ (reference level 20 μg/㎥). The corresponding socioeconomic cost was about 31 trillion won. These estimated values were higher than that when applying nationwide HRs. Conclusions: This study is the first research to estimate the premature mortality caused by long-term exposure to PM using relative risks derived from the national population. This study will help precisely identify the national and regional health burden attributed to PM and establish the priorities of air quality policy.
이미지의 의미론적 특징점 기반의 3차원 의미론적 재구성
안성환(Ahn, Sung-Hwan),오창선(Oh, Chang-Seon),차준(Cha, Jun),홍준형(Hong, Jun-Hyoung),김동호(Kim, Dong-Ho) 한국방송·미디어공학회 2023 한국방송공학회 학술발표대회 논문집 Vol.2023 No.11
3차원 공간 데이터의 획득과 획득한 공간의 해석은 메타버스 분야에서 현재 활발히 연구되고 있는 분야이다. 본 논문에서는 3차원 공간의 해석과 3차원 공간 데이터의 획득을 동시에 할 수 있는 3차원 공간 재구성 방식을 제안한다. 제안된 방식은 2차원 이미지의 의미론적 분할 결과를 3차원 공간 상의 점에 그대로 투영시켜 의미론적으로 분할된 3차원 공간의 데이터를 얻는다. 이미지의 의미론적 분할에는 ResNet기반의 semantic segmentation 모델을 사용하였고, 3차원 공간 재구성의 구현에는 SfM(Structure from Motion)프로그램 Meshroom[1]을 참조하였다.