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박성일(Park Sung-Il),박경봉(Park Keong-Bong),정광무(Jung Gwang-Moo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently a rolling stock has been requiring more convenience facilities for passenger as well as satisfied the basic functions. The convenience facilities design take into consideration safety factor, convenience and easy accessible for disable passenger. In a point of view, convenience facilities should be considered and designed as well as related safety. This paper describes points to be considered on design with related to convenience facilities and safety factor of Diesel Multiple Unit for Intercity through the IRISH DMU.
김명한(Myong Han Kim),박경봉(Keong Bong Park),조현직(Hyun Jik Cho),이재욱(Jae Wook Lee) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.5
전동차의 소비전력(Energy Consumption)은 유지보수 비용 절감 및 온실가스 배출 규제 대응을 위한 중요한 요인으로 본 연구에서는 전동차의 주요 전력 소모 장치인 추진 제어장치의 소비전력에 영향을 미치는 중량, 효율, 주행저항, 구배저항, 곡선저항, 출발저항 및 관성질량 등의 요인을 TPS(모의 주행 시뮬레이션) 및 성능 계산을 이용하여 분석하였으며, 차량의 주요 장치와 서비스 기기에 전원을 공급하는 보조전원장치의 부하 별 소비전력을 분석하였다. 이러한 분석 결과를 바탕으로 소비전력 영향 요인 및 전력 사용량 예측 방안을 도출하였으며 주요장치의 용량 최적화 자료로 활용하고자 한다. Energy efficiency is a key factor for the EMU trains reasons of cost effectiveness and environmental competition. In this study, affecting factors to energy consumption for EMU trains such as train weight, efficiency, running resistance, gradient resistance, curve resistance, starting resistance and inertia mass are analyzed with TPS(Train Performance Simulation) and performance calculation. And energy consumption of each load for APU(Auxiliary Power Unit) which is fed the power to the major equipment and service equipment is analyzed. Based on the results of this analysis, energy saving strategy and prediction method of energy consumption were derived and it will be applied to the capacity optimization of APU.
저탄소 Cr-Mo 강의 플라즈마 침탄식 표면탄소농도의 영향에 관한 연구
이경섭,신동명,박경봉 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.2
It was investigated the influence of process variables, such as time, temperature, pressure and current density on the hardness, microstructure and surface carbon content during plasma carburizing of a low carbon Cr-Mo steel(0.176C, 0.119Si, 1.014Cr, 0.387Mo). As the process variables increased, the effective case depth in plasma carburized steel increased up to 50% in comparison to that of gas carburizing. With increasing time, cementite formed along the austenite grain boundaries at carburized surface and thickened. Also the surface carbon content increased initially, then its rate slowed down. Owing to the enhanced carbon adsorption rate on the surface during plasma carburizing, the supersaturation of austenite with respect to carbon occurred faster than in conventional gas carburizing process. The effective case depth increased with the surface carbon content. It is considered that the formation of carburized layer of low carbon Cr-Mo steel during plasma carburizing depends on the surface carbon content so that the use of plasma would not influence the diffusion rate of carbon in steel.