http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최진유(Jin-Yu Choi),박찬우(Chanwoo Park) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.6
최근 국내에서는 산악지역에 거주하는 주민들의 겨울철 폭설과 결빙에 의한 통행 제한으로 겪는 생활의 어려움을 해결하기 위하여 산악철도시스템의 개발을 진행하고 있다. 본 논문에서는 개발 중인 산악철도시스템의 특성을 분석하고, 톱니바퀴형 산악철도와 트램의 과거 사고사례들, 그리고 일반적으로 철도에서 정의하고 있는 위험요인 등을 고려하여 산악철도시스템에 적합한 위험요인들을 식별하였다. 산악철도 운행 시 예상 가능한 사고를 충돌사고, 탈선사고, 화재사고, 사상사고, 건널목/경합구간 사고의 5가지 사고로 분류하였고 각 사고별로 위험사건과 위험요인을 식별하였다. 그리고 각 위험요인별로 세부위험요인을 식별하였다. 본 논문에서 식별된 산악철도시스템의 위험요인들은 향후 산악철도시스템의 예비위험도 분석과 안전관리대책 수립의 기초자료로 활용될 수 있을 것이다. In Korea, a mountain railway system is being developed to solve the difficulties of residents living in the mountain areas due to the restriction of traffic by heavy snow and ice in winter. In this study, the hazard identification which is customized to the developing mountain railway system was conducted by considering the characteristics of the developing system, past accident cases of the mountain trains of the rack&pinion type and trams in the world, and risk factors defined in the ordinary railway system. Predictable accidents during mountain railway operation were classified into five types of accidents: collision, derailment, fire, casualty, and crossing/competitive section accidents. Hazardous events and hazards were derived for each accident. Moreover, specific hazards were derived for each hazard. The hazards of the mountain railway system identified in this study can be used as basic data for preliminary hazard analysis and establishment of safety management measures for mountain railway systems in the future.
최진유(Choi Jin-Yu),최일윤(Choi Il-Yun),이준석(Lee Jun-Seok),김태욱(Kim Tae-Wook),이동형(Lee Dong-Hyung),서정원(Seo Jeung-Won) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In recently, rail deteriorations -rolling contact fatigue, wear, etc- arise as hot issue of track maintenance by speed increasing of railway. And the relative importance of the rail maintenance in concrete track, which is adopted as a track system for 2nd phase of Kyung-Bu and Ho-Nam high speed line, will be increased much more. Furthermore the rail maintenance trouble was already serious in Metro by excessive wear of rail profile, and excessive noise in sharp curve line. But effective scheme for the rail maintenance is established yet in our country. To work out such a problem by laboratory test or simulation, the wheel-rail contact simulator was developed. The simulator was developed to test various phenomena on wheel and rail surface by contact of wheel and rail at speed of maximum 400㎞/h using real scale wheel and rail which are also variable. And, using the simulator, it can be investigate deterioration phenomena of wheel and rail under various contact angle, attack angle, running speed, environmental condition, wheel and thrust load condition. The test results using the machine can be used for improvement of profile of wheel and rail, estimation of life period of rail and wheel etc, and, after all, it leads effective maintenance of wheel and rail.
최진유(Choi Jin Yu),김인재(Kim In Jae),황성호(Hwang Sung Ho),양신추(Yang Shin Chu) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The demand on a turnout layed on a bridge is rising owing to the increasing number of stations on the viaduct. And also the demand on a turnout with CWR is rising to upgrade running speed of the passing train. A CWR connected with turnout is subjected to additional axial force induced by the actions due to change in temperature, braking and starting force, and bending of the deck. But magnitude and distribution of the axial force in rails of turnout is not clear yet. So, in this study, a field measurement was conducted to know them. The strain gage method was adopted for field test. The FBG sensor for the strain measurement was used to ensure stability of test value and durability of gage for long term. It is expected that we can get data on the axial force in rail connected with turnout with respect to seasonal temperature change by the established field test system.
레일의 단ㆍ장파장 결함에 따른 궤도의 동적응답 변화특성 분석
최진유(Choi Jin Yu),황만호(Hwang Man Ho),양신추(Yang Shin Chu),황성호(Hwang Sung Ho) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
A numerical analysis was performed to verify how much additional force is induced by short or long pitch rail corrugations in track. The rail corrugations assumed as sine wave having various pitches and depths. The variation of wheel force, displacement and acceleration of rail and sleeper was investigated. In the results, it was shown that each item of the investigation was increased as the pitches and depths become large. It is expected that the results of the parametric study can be used as a preliminary data for the determination of economical maintenance criteria for rail corrugation in the future.
콘크리트궤도부설 교량의 접속슬래브 허용변위한도에 관한 연구
최진유(Choi Jin Yu),양신추(Yang Shin Chu),유진영(Yoo Jin Young),조현철(Cho Hyun Cheol) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The transition area between a bridge and an earthwork is one of the weakest area of track because of the track geometry deterioration caused unequal settlement of backfill of abutment. In case of a ballastless track, the approach slab is installed to prevent the phenomenon. But, if there is occurred the inclined displacement on the approach slab by a settlement of the foundation or formation, the track is also under the inclined displacement. And this defect causes reducing the running stability of a vehicle, the riding comfort of passengers, and the deteriorations of track by excessive impact subjected to the track. In this study, parametric studies were performed to know what is the allowable displacement limit on the approach slab to avoid such a bad effect. The length and amount of unequal settlement of the approach slab was adopted as parameter for numerical analysis. And car body accelerations, variations of wheel force and rail stress and uplift force induced on a fastener clip are investigated. From the result, resonable settlement limits of an approach slab according to slab length was suggested.
최진유(Choi Jin-Yu),김은(Kim Eun),황만호(Hwang Man-Ho),조수익(Cho Su-Ik) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Ballasted track is under the circumstance of repetition of deterioration and recovery. Track deterioration is presented as track irregularity or settlement, and dynamic force subjected to track is one of major cause of the deterioration. The dynamic force is determined from the dynamic interaction between track and vehicle. Rail-pad stiffness is one of the factor affects track dynamic property. In this study, the relationship between rail-pad stiffness and track settlement was investigated. Dynamic forces according to various rail-pad stiffness was obtained from the dynamic vehicle-track interaction analysis using DARTS-NL. Track settlement was calculated by substitution the dynamic forces into various formulas for track settlement. From the result of analysis, it was known that the track settlement is increased about 6% when the rail-pad stiffness rise about twice. And this result leads that there is only a little relationship between rail-pad stiffness and track settlement.