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고속선과 기존선 인터페이스 구간의 동조유니트 BA 분석
안광렬(AN Gang-Yell),유근수(YOO Keun-Su),최경일(CHOI Kyoung-Il),박재영(PARK Jae-Young),백종현(BAEK Jong-Hyun),김용규(KIM Yong-Kyu) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In Gyeongbu high speed line, information transmission from wayside to rolling stocks are carried out via UM71 AF track circuits. And with the use of various frequencies, JES(Electrical Separation Joint) are used to conduct interference and blocking for adjacent track circuits. For such a non-insulated track circuit failures mainly occur in trackside, especially failures which are impossible to identify causes often occur. In this paper we analyze on turning unit BA of track circuits on which the failures occurred. For a relevant review, with the use of design values and measured values in the failure sites, we apply the maintenance method which SNCF has used
전용주(Yong-Joo Jeon),이태훈(Tea-Hoon Lee),최경일(Kyoung-il Choi),이시빈(Shi-Bin Lee),한상길(Sang-gil Han) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper introduces insulator pollutant accumulate pattern in the tunnel of korea railroad. To accomplish this goal, effective sample collecting method was proposed for the first step. Dust at the surface was collected directly. Distilled water and brush was used while collecting. Through this method dust is easily and accurately collected. The second step is pollutant analysis. Several analyze item is selected such as quantity, conductivity, contact angle, Optical Microscope(OM), IR, Equivalent Salt Deposit Density(ESDD), and ICP-AES. The third step, best represent tunnel was selected considering location, length and natural surroundings. Also to consider the difference at inside the tunnel, several bracket insulators were selected along to the location. To make the result precise, above procedure was repeated several times at the same target. Finally relation among type of train, numbers of movement, surroundings, length will be considered in combination with the pollution. With this result pollute map for KORAIL could be accomplished and inspect period will be optimized case by case
이태훈(Tae-Hoon Lee),전용주(Yong-Joo Jeon),이시빈(See-Bin Lee),최경일(Kyoung-Il Choi),한상길(Sang-Gil Han),박영식(Young-Sik Park),박기범(Ki-Bum Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
고속철도 전차선로에 설치된 드롭퍼의 와이어가 파단되어 원인을 분석하기 위해 드롭퍼의 구간별/설치위치별/지역별 단선현황 분석, 파단면 SEM(Scanning Electron Microscope) 분석, 미세조직 분석 및 드롭퍼에 작용하는 정적하중을 계산하였다. 또한 고속철도 전차선로에서 드롭퍼의 정적 및 동적하중 측정과 분석을 통하여 드롭퍼의 피로 하중 특성을 확인하였고, 지지점의 압상량을 측정 및 분석하였다.
김용규(KIM Yong-Kyu),백종현(BAEK Jong-Hyun),최경일(CHOI Kyoung-Il),류근수(YOO Keun-Su) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Surge proof equipment is an installation to make surge flow on the ground promptly so as to reduce surge-related damage on infrastructure, not to prevent surge from falling down on infrastructure directly. Compared with classical line individual earth, High speed line common earth has higher surge characteristic and plays a significant role to prevent infrastructure damage and injuries from surge, or short circuit accident between 25kV catenary and rail. In this paper, we analyzed the case of accident that caused communication/signaling system impaired while a tractor crossing level crossing at Honam line; in addition, we examined the accident reduction measures to minimize injury and property damage from cutting accidents with respect to common earth network.
성장 중인 가토에서 하악두 상부절제술이 하악골 성장에 미치는 영향에 관한 실험적 연구
최경일,김종원 대한두개하악장애학회 1991 대한두개하악장애학회지 Vol.3 No.1
The purpose of this experiment was to study effect of loss of condylar chondroid tissue to growth and development. The experimental materials were 20 rabbit aging 4 weeks and weighing about 900g. Both control and experimental group were devided as 1 week, 2 weeks, 4 weeks, 6 weeks and 8 weeks and each week groups consisted of 2 rabbits. The high condylar shaving in the left temporomandibular joint were performed. Every specimen was made by midsagittal section of the skull and taken soft x-ray radiogram by standardization. Measuerments were measured after tracing of x-ray. The temporomandibular joint and their surrounding tissues were obtain to microscopic specimens stained with Hematoxilin-Eosin method. The results as follows. 1. The change of weight and measurements through the time follow, was simillar pattern in both control and experimental group as well as both side of experimental group. 2. The operation site was gradually taken healing process and healing was completely in 8 weeks by chondroid tissue. 3. The author concluded that high condylar shaving in growing individuals have no effect to growth and development.