• Journal of the Korean Society for Railway
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• 제10권1호
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• pp.38-41
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• 2007

• Railway Journal
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• 제17권5호
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• pp.20-28
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• 2014

• Proceedings of the KIEE Conference
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.181-183
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• 2008

전기철도차량에서 발생되는 고조파전류는 각종 문제를 야기시킨다. 예를 들어 고조파전류의 발생은 인접통신선에의 유도장해를 일으키고 철도신호장애의 원인이 될 뿐만 아니라, 전원계통에 유입되는 경우에는 보호계전의 오작동을 일으키는 경우도 있다. 이에 고조파전류 발생을 줄이거나 차단하기 위하여 많은 연구가 진행되고 있다. 본 논문에서는 전기철도차량의 주행상태에 따라 차량에서 측정된 전압, 전류 값을 분석하여 고조파의 발생이 어떠한 관계가 있는지 분석하여 보았다.

• Proceedings of the KIEE Conference
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.1603-1604
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• 2015

ECB(Eddy Current Brake)는 철도시스템의 고속에서 제동력을 안정적으로 나타낼 수 있어서 TGV, ICE, JR-500등과 같은 철도에서 사용되고 있다. 하지만 저속에서는 효율적이지 못하고, 전자석은 경량성에 대한 문제와 에너지를 소비한다는 단점을 가지고 있다. 이 논문에서는 제안된 영구자석형 Shield moving형 와전류 제동기를 사용하였다. 이 와전류 제동기는 Shield의 각을 이동하여 제동력을 조절할 수 있으며 영구자석을 이용함으로서 전자석의 단점을 보안하였다. 하지만 영구자석은 온도에 대해 영향을 받을 수 있으므로 온도 특성은 전류밀도(J(A/m2))와 자속밀도(T)를 'Ansoft Maxell'을 시뮬레이션하여 확인하였다.

• Journal of the Korean Society for Railway
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• 제15권4호
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• pp.370-375
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• 2012

In order to apply Interior Permanet Magnet Synchronous Motor(IPMSM) to the propulsion system of the railway transit, 110kW class IPMSMs with high-power density are designed as a concentrated winding model and a distributed winding model in this study. The concentrated winding model designed in this study is 6 poles/9 slots and the distributed winding model is 6 poles/36 slots. In general, the eddy current losses in the permanent magnets of IPMSM are caused by the slot harmonics. The thermal demagnetization of the magnet by the eddy current losses at high rotational speed often becomes one of the major problems in the IPMSM with a concentrated windings especially. A design to reduce eddy current losses in permanent magnet design is important in IPMSM for the railway vehicle propulsion system which requires high-speed operation. Therefore, a method to devide the permanent magnet is proposed to reduce the eddy current losses in permanent magnet in this study. Authors analyze the variation characteristics of the eddy current losses generated in permanent magnet of the concentrated winding model by changing the number of the division of the permanent magnets.

• Journal of the Korean Society for Railway
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• 제18권4호
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• pp.391-400
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• 2015

This research used a survey of 350 staff members working at Korail with the purpose of analyzing influence factors for the railway tourism policy for job satisfaction; results were presented for the proposed factor. First, we selected the influence factor through precedent research related to the railway tourism policy. Second, the selected influence factor and the extent of satisfaction were used to determine whether or not any kind of difference existed according to individual attributes of the railway employees. Finally, we analyzed what the influence factor was between the category factor and the sub-category factor. In conclusion, it was found that government subsidy had a meaningful correlation with infrastructure expansion and the improvement of the railway business as it is connected to tourism efficiency. Human resources have a meaningful correlation with the needs of educational institutions and the retaining of talent. Railway tourism production has a meaningful correlation with railway tour production as it is conducted to satisfy tourists and the consortium. The shift of viewpoint has a meaningful correlation with the escape from the peace-at-any price principle and demand forecasting.

• Proceedings of the KSR Conference
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• 한국철도학회 2006년도 춘계학술대회 논문집
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• pp.825-831
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• 2006

• Journal of the Korean Society for Railway
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• 제12권1호
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• pp.161-166
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• 2009

DC feeding system is mainly floating but rail potential and leakage current are due to long parallelism between rails and ground, namely rail resistance and rail to ground conductance. Rail potential causes electric shock to human and rail leakage current causes electrolytic corrosion to nearby the buried metals. Therefore the design technologies to reduce, protect and monitor these effects are important in recent DC feeding system. Rail potential and leakage current are analysed based on propagation theory that is utilized. Monitoring and controlling rail leakage current is proposed in order to maintain rail resistance and rail to ground conductance.

• 전기의세계
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• 제61권3호
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• pp.18-24
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• 2012

• Magazine of the Korean Society of Hazard Mitigation
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• 제10권2호
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• pp.24-28
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• 2010