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장세기(Seky Chang),김용기(Yong Ki Kim),오창록(Chang-Rok Oh),구병춘(Byeong-Choon Goo) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Underframes of rolling stock structure are made of hot rolled steel of SS400 or SM490A. While these underframe steels are designed to satisfy the mechanical requirements, theircorrosion behavior also should taken into account. Underframes are coated to prevent corrosion, but they are often defected by external factors to result in local corrosion which may cause the weakness of mechanical strength. Thus, the corrosion of underframe steels was examined through atmospheric corrosion test to estimate service life and safety.
장세기(Seky Chang),목재균(Jai Kyun Mok),임태훈(Lim Tae Hoon) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Power of fuel cell tram is supplied by only fuel cell system or hybrid system of fuel cell and battery/super capacity. Fuel cell is operated by hydrogen, which is fed directly from hydrogen tank or by reforming gasoline or methanol into hydrogen. Power system is preferred with hybrid of fuel cell and battery/super capacity since it improves total energy efficiency through interaction of hybrid components and restores energy regenerated by braking. Also, power supply system by fuel cell hybrid should be designed to output optimum energy efficiency depending on driving mode of fuel cell tram.
장세기(Seky Chang),목재균(Jai Kyun Mok) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
High cost of crude oil imposes a heavy burden on vehicle users. Thus, much efforts are given to the development of alternative energies in advanced countries as well as our country. Among them, fuel cell is emerged as the most promising one for transportation. There is no harmful emission with hydrogen energy of which sources are abundant on the earth. The use of both fuel cell with self-generating system and electromanetic guidance system will be able to make urban track rapid transit operate even in the city areas of very limited infrastructure space with flexibility and on time accessibility. The high efficiency is also expected with clean environment and easy riding for both the old and the handicapped.
장세기(Chang Seky),신민호(Shin Min-Ho) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Railroad has been one of major public transportations with the advantages of safety and schedule accuracy. However, the sustainable development will be the first principle in order to save the earth environment in the future, and the only transportation that satisfies it can continuously survive. Transportation has caused air pollution severely. Thus, the most environment-friendly means of transport should be chosen to maintain clean environment in the 21st century. Railroad is currently the best choice to fulfill the mission. But, the overall railroad technologies should be developed in consideration of clean environment to be a future leading transportation.
장세기(Seky Chang),김용기(Yong-Ki Kim),구병춘(Byeong-Choon Goo) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Rail cars are subject to vibration, impact and wear which can cause severe defects leading to a fatal accident Thus, they are designed and manufactured in consideration of such factors influencing their service lifetime. Under-frames are composed of steel and support most of load imposed on the car. Steel is very sensitive to corrosive environment and corroded even in a normal service condition. Regular maintenance can protect steel parts from corrosion by painting. However, an exposure of defect point to corrosive agents can make corrosion proceed to a considerable depth, which may cause the structure to remain under safety standard. It is necessary to understand corrosion behavior of rail cars in order to estimate unexpected accidents by corrosion.
장세기(Seky Chang),문경호(Kyung Ho Moon ),김연수(Yeon Su Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The bimodal tram was designed to drive on the dedicated track as well as on the public road. The position and speed are automatically controlled on the dedicated track by the onboard computer whereas they are manually controlled by driver like motor vehicles on the public road. The ride comfort the passengers feel and the effect of the vibration generated during driving on the passenger's health comfortableness and motion sickness were evaluated with driving the bimodal tram prototype in automatic and manual mode respectively. The test was done in automatic mode on the test track with various load conditions while it was done in manual mode on the public road with empty load.
장세기(Chang Seky),이강원(Lee Kang-Won),배창한(Bae Chang-Han) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
National projects on renewable energy and new energy are driven more actively than ever in many countries for the exhaustion of fossil fuel energy from the turn of the century. Such activities began to spread out in railway industry with centering around west European countries. Electric energy is generated on the hybrid vehicle itself, which contributes to reduction of the cost for construction of the infrastructure required for the supply of electric power. Hybrid tram is mainly composed of propulsion system to control electric energy, automatic guidance system to control steering and operation, and central vehicle unit to control and monitor major electronic devices. Generation and supply of electric power are made by the combination of engine generator and battery, or fuel cell and super capacitor.