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윤차중(Cha-Jung Yoon),장선영(Sun-Yung Jang) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
연구과제를 수행하는 절차는 크게 나누어 정리해 보면 다음과 같다. 먼저 연구과제가 제안되면 선별하여 기획연구를 수행한다. 그 결과 연구개발이 필요한 경우 수행과제에 대한 연구계획을 세우게 된다. 그 계획에 따라 연구개발을 진행하고 이에 대한 전문가들의 평가를 통해 내실 있는 연구결과가 도출 될 수 있도록 하고 있다. 그 뒤로 실용화와 기술사업화까지가 연구개발의 흐름이라고 말할 수 있을 것이다. 이 과정중 연구 과제를 체계적으로 수행하기 위해서 다양한 시스템엔지니어링 기법이 적용되기도 하고 관련된 프로그램을 활용하기도 한다. 본 논문에서는 WBS(Work Breakdown Structure + Product Breakdown Structure + Cost Breakdown Structure)를 적용하여 체계적인 연구개발 과제를 관리하고자 했던 사례를 제시하였다. After considering all the factors, a procedure for carrying out the research project is as follows. First of all, we basically conduct a planning study if the project is proposed. If it is decided that the project is necessary, we should make a plan for the project. Then we carry out the R&D plan with expert evaluation, which will help us draw the substantial result of the project. We can say that the above mentioned process with a practical use and technology commercialization is the whole process of R&D. In order to carry out the project systematically during the process, we are able to apply various system-engineering techniques and relavant softwares. This study proposed the practical case, which applied the R&D management procedure using WBS(Work Break Structure), as well as the pros and cons. We hope that it’ll be one of the most practical references for a chief of a project.
KTX-1 고속전철의 병렬부하형 IGBT 제동초퍼장치 설계에 관한 연구
윤차중(Cha-Joong Youn),노명규(Myoung-Gyu Noh),이을재(Eul-Jae Lee) 대한전기학회 2013 전기학회논문지 Vol.62 No.3
This paper presents a new design works for the braking chopper system which is included in the propulsion system of KTX high speed train. Due to the current fed type synchronous motors used in the propulsion system, some different behaviors are shown comparing to the voltage type other chopper systems. Specially this chopper system acts either braking controlling or regenerative power controlling system with a parallel resistive load in the propulsion system. In this paper, an improved simple high power IGBT brake chopper system has proposed which is able to be replaced with an existing complicated GTO chopper system. The analytical approaches to the parallel load type current chopper system and the propper snubber circuits calculation were explained in this paper to control new chopper system. In addition, the thermal resistance of the cooling system for power dissipation of IGBT modules was calculated also. Finally several PC simulations have been done to clarify its availability.
발수 성분을 포함하는 프로필렌글리콜(PG) 기반 고속철도차량용 제·방빙액의 특성
윤차중 ( Cha-jung Yun ),이홍기 ( Hong-ki Lee ),박진명 ( Jin-myeong Park ),김태현 ( Tae-hyun Kim ),양정무 ( Jung-mu Yang ) 한국공업화학회 2023 공업화학 Vol.34 No.1
화학적 제빙 방법으로 프로필렌글리콜 제빙액은 동절기 고속철도차량 하부 및 대차부에 부착되는 설빙으로 인한 결빙을 녹이는데 적용가능하다. 프로필렌글리콜 제빙액을 운행 전 고속철도차량에 철도차량 하부 및 대차부에 미리 살포하여 눈의 부착을 최소화하면 해빙 효율을 더 높일 수 있다. 고속철도의 경우 프로필렌글리콜 제빙액을 살포하여도 고속으로 운행 시 대차 표면에서 제빙액은 거의 소실되기 때문에 눈의 부착으로 인한 결빙에 대한 방빙성능은 떨어진다. 본 연구에서는 동절기 고속철도차량 하부 및 대차부에 부착되는 설빙으로 인한 결빙을 방지하기 위해 표면의 결빙을 방지하는 발수 성분을 포함하는 프로필렌글리콜 제·방빙액의 특성을 연구하였다. 발수제의 종류에 따른 점도, 융빙성능, 접촉각 및 방빙성능에 대한 비교 평가를 실시하여 고속철도차량 제ㆍ방빙액으로 최적의 물질을 찾고자 하였다. 평가 결과 에톡시실란 타입의 발수제 성분을 포함하는 제·방빙액이 가장 적합한 것으로 확인하였다. As a chemical de-icing method, propylene glycol de-icing fluid is applicable for melting ice caused by snow and ice adhering to the lower part of high-speed rail rolling stock and bogie parts in winter. By spraying propylene-glycol de-icing fluid on high-speed rail rolling stock and bogie parts in advance to minimize snow adhesion, ice-melting efficiency can be further improved. In the case of high-speed rail rolling stock, even if propylene-glycol de-icing fluid is sprayed, the anti-icing performance is poor because the fluid is almost lost on the surface of the vehicle when operating at high speed. In this study, in order to prevent freezing caused by snow and ice adhering to the lower part of high-speed rail rolling stock and bogie parts, we have investigated the properties of propylene-glycol de/anti-icing fluid containing water-repellent agents that prevent surface freezing. We tried to find the optimal component for de/anti-icing fluid for high-speed rail rolling stock by evaluating the ice melting performance, contact angle, and anti-icing performance according to the types of water-repellent agent. As a result of the evaluation, it was confirmed that an de/anti-icing fluid containing an ethoxysilane-type water repellent agent was most suitable.
윤차중(Yun Cha-Jung),조유희(Cho You-Hee),최덕호(Choi Deuck-Ho),유양하(Ryu Yang-Ha),소진섭(So Jin-Sub) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
The high-speed train(KTX) was operated in domestic since 2004 and 4years have been passed since then. At the beginning most of the KTX component maintenance period was followed by the France SNCF. It was settled by the TBO(Time Between Overhauls). But the environment and operation condition are different form each other, so the TBO maintenance period can be different in some component. Therefore new TBO is necessary based on our own circumstances. This paper introduces failure analysis case on some components to set TBO in domestic. KTX-RCM(Reliability Centered Maintenance System), MICS(Maintenance Information Computer System) and KOVIS(KORAIL ERP System) Data was investigated.
유지보수정보 주기를 고려한 KTX-1 모터블럭 개발품의 수명주기비용 예측
윤차중(Cha-Jung Yun),노명규(Myoung-gyu Noh),김재문(Jae-Moon Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.2
This paper presents the result of life-cycle cost (LCC) estimation for domestic products propulsion control system (motor block unit) of KTX-1 considering periodic maintenance. Life cycle costing is one of the most effective approaches for the cost analysis of long-life systems such as the KTX-1. Life cycle costing includes the cost of concept design, development, manufacture, operation, maintenance and disposal. To estimate LCC for domestic products motor block unit, it was analyzed physical breakdown structure (PBS) on motor unit in view of maintenance cost and unit cost etc. As a results, life cycle cost on motor block unit increased moderately expect for periodical time when major parts are replaced at the same time. hereafter this results will be reflected in the domestic products being developed.
KTX 고속전철 추진제어시스템의 동기전동기 구동 동작특성 분석
윤차중(Cha-Jung Yoon),박상운(Sang-Woon Park),이은규(Eun-Kyu Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
This paper describes how to apply to commutate of thyristor efficiently. Thyristor is used for the high power system as the research to secure domestic technology of the Current Source Inverter(CSI) for the synchronous motor operation which is used for the propulsion system of KTX. It has been composed to be available for the stable switching operation of the thyristor by supplementing problem of load commutation method according to small Counter ElectricMotive Force(EMF) at low speed area of synchronous motor via auxiliary commutation circuit using forced commutation method. We also have verified through the simulation using the Matlab.
신형전기기관차(8200대) HEP 장치 출력전원 품질분석
윤차중(Yun Cha-Jung),이을재(Lee Eul-Jae),소진섭(So Jin-Sub),박상운(Park Sang-Woon) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The 8200 series electric locomotive which are operating in domestic have a typical power supplying system. This system is different from the existing locomotive which called HEP. (Head Electric Power). By using HEP, power can be continuously supplied to passenger compartment without generator car. But while operating, unpredicted problems reported in passenger service area. This paper presents technical investigation of the HEP output power circuit and also filed test measurement. The collected raw dat were investigated in technical and economical point of view. Effective method were reviewed. Through technical review measured data were used in the simulation with deductive resoning method.
살사 재료가 고속차량(KTX) ATC 신호에 미치는 영향분석
윤차중(Yun Cha-Jung),이해재(Lee Hae-Jae),조용기(Cho yong-Gee),김진규(Kim Jin-kyu),최선규(Choi Shun-gyu) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
When the high speed train (KTX) departs from station in the high-speed line, sometimes on board signal disappears, which causes a hindrance of the operation punctuality, therefore, we have a research objective to verify the causes of hindrance and to find an improvement plan. In the process of research, when train left, we applied sand on the rail to improve adhesive power, whose sand has an effect on the ATC(Automatic Train Control) signal wave. We detected & analyzed signal waves which came from detecting device by changing operation condition in accordance with sand material