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서경수,한현수,윤화현,황문세,홍민기 한국철도학회 2022 한국철도학회논문집 Vol.25 No.12
To achieve performance goals through resource input in urban railway rolling stock operation, it is important to use rolling stock optimized for operating conditions. In this paper, we analyzed the efficiency of Seoul Metro Line 7 & 8 rolling stock maintenance operations using DEA; this involved comparing the TE(Technical Efficiency), PTE(Pure Technical Efficiency), and SE(Scale Efficiency) of identical type rolling stock operations on different operation lines. Also, the status of scale efficiency in the relationship between input and output was investigated. It was confirmed that, if the same rolling stock was operated on a line with long route length and high passenger demand, there was large deviation between lines in both technical efficiency and pure technical efficiency; there was also a difference in status of scale efficiency. Through this study, we suggest implications for various aspects of decision-making, such as establishing strategies for optimizing rolling stock operation and maintenance of urban railroad operators.
김종범,우상희,김창혁,임형진,황문세,윤화현,이승복,정준식,배귀남 한국도시철도학회 2017 한국도시철도학회논문집 Vol.5 No.4
After installation of platform screen doors, air quality in Seoul metropolitan urban subway tunnel was deteriorated. In addition, concern about air quality in subway cabin have been increasing. We carried out measurements of indoor air quality in a subway cabin on Seoul Metropolitan Subway Line 5 during evening rush-hours in February 3, 2017. A fast mobility particle sizer (FMPS) and an aerodynamic particle sizer (APS) were used to measure particles ranging 5.6-560 ㎚ and 0.5-20 ㎛, respectively. An indoor air quality (IAQ) monitor was also used to measure CO2 concentration, temperature, and relativity humidity (RH). For the trip 1 from Macheon to Bangwha, CO2 concentration, temperature, RH were 1,315±482 ppm, 20.8±0.9℃, 30.8±5.4%, respectively. For the trip 2 from Bangwha to Sangil-dong trip, CO2 concentration, temperature, RH were 1,065±218 ppm, 20.9±0.4℃, 29.0±2.4%, respectively. Particle concentrations measured by FMPS were 17,175±4,780 particles/㎤ and 20,328±5,506 particles/㎤, and those obtained by APS were 161±58 particles/㎤ and 188±47 particles/㎤, respectively for trips 1 and 2. PSD가 설치된 이후 도시철도 터널의 공기질은 악화되었고, 이에 따라 도시철도 객실의 공기질에 대한 관심이증가하고 있다. 2017년 2월 3일 퇴근시간대에 수도권 도시철도 5호선에서 1회 왕복구간을 대상으로 객실 내 공기질 평가를 수행하였다. 입자상 오염물질 측정을 위해 FMPS와 APS를 사용하였고, CO2, 온습도의 측정을 위해 IAQ monitor를 사용하였다. 마천에서 방화구간(trip 1)에서 CO2는 1,315±482 ppm, 온도는 20.8±0.9℃, 습도는 30.8±5.4%로나타났다. 방화에서 상일동 방면(trip 2)에서는 CO2 1,065±218 ppm, 온도 20.9±0.4℃, 습도 29.0±2.4%로 나타났다. 입자상 오염물질의 경우 trip 1에서 FMPS 17,175±4,780 particles/㎤, APS 161±58 particles/㎤로 나타났고, trip 2에서는FMPS 20,328±5,506 particles/㎤, APS 188±47 particles/㎤로 나타났다. 구간별로는 trip1에서 김포공항역과 아차산역이가장 높게 나타났고, tirp 2에서는 마곡역과 우장산 역이 가장 높게 나타났다. 입경별로는 FMPS의 경우 10 ㎚와 30 ㎚에서 최대 피크를 나타냈으며, APS에서는 0.5 ㎛와 2 ㎛에서 최대피크를 나타냈다. 측정결과 도시철도 출입구의변형과 차량과 차량 사이 통로 하부부식, 승객 출입 개폐문 하부부식으로 인해 터널 공기가 객실로 유입되고 있었고, 이에 따라 터널 내 오염물질이 객실 내 공기질에 영향을 미치고 있는 것을 확인할 수 있었다.