• 전기산업
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• v.3 no.3
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• pp.71-85
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• 1992

• NEWSLETTER 전기공업
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• no.93-14 s.87
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• pp.20-24
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• 1993

• 전기산업
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• v.6 no.1
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• pp.83-98
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• 1995

• 전기산업
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• v.7 no.3
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• pp.72-75
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• 1996

• 전기의세계
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• v.46 no.11
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• pp.13-21
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• 1997

본 원고에서는 현재 운용되고 있거나 개발 중에 있는 전동차의 종류와 각 전동차에 대한 운용적, 기술적 특성을 소개하고 전기분야의 핵심기술을 정리하였다. 또한 전기관련 철도기술에 대한 국내의 기술현황 및 연구동향에 대해서도 소개하였다.

• Korea Information Processing Society Review
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• v.29 no.4
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• pp.58-65
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• 2022

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.3
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• pp.488-495
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• 2007

In spite of regular electrical safety inspection and improvement management of incongruent facilities, over 80 percent of electrical fires were generated in electrical facilities for general use, and the prevention of electrical safety accidents gets more difficult because of incomprehension on electrical safety inspection system, the increasement of non-inspection electrical facilities user, un-installation of residual current protective devices and leaving unsuitable equipments alone. This paper analyzed electrical safety inspection system of electrical facilities for general use and results of safety inspection and electrical fire statistics, and deducted the related problems. Also, improvement method of safety management of electrical facilities for general use was proposed in view of electrical safety inspection system, inspection implementation method, electrical fire statistics establishment, electrical safety consciousness and remote electrical safety inspection system.

• Journal of Hydrogen and New Energy
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• v.34 no.4
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• pp.350-357
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• 2023

In this study, the experimental investigation and theoretical analysis were conducted to verify the cooling capacity of the cryocooler used for pre-cooling of hydrogen gas. The effect of the flow rate on a copper pipe attached to the bottom of the cryocooler, which has a coil shape in a hydrogen line, was investigated. Temperature sensors were strategically placed at various positions on the cryocooler to analyze the temperature variations with respect to the flow rate. In this study, the thermal properties of hydrogen for the pressure and temperature were utilized using REFPROP to analyze the cooling capacity of the cryocooler. Based on the experimental results derived from this study, the cooling capacity of the cryocooler for pre-cooling hydrogen gas was considered by calculating the cooling temperature according to the flow rate through theoretical analysis.

• Journal of Hydrogen and New Energy
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• v.34 no.4
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• pp.342-349
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• 2023

In this study, a numerical simulations were conducted to analyze the phase change behavior of a liquid hydrogen storage container. The effects of gravity direction and hydrogen filling rate on boil-off gas (BOG) in the storage container were investigated. The study employed the volume of fluid, which is the phase change analysis model provided by ANSYS Fluent (ANSYS, Canonsburg, PA, USA), to investigate the sloshing phenomenon inside the liquefied hydrogen fuel tank. Considering the transient analysis time, two-dimensional simulation were carried out to examine the characteristics of the flow and thermal fields. The results indicated that the thermal flow characteristics and BOG phenomena inside the two-dimensional liquefied hydrogen storage container were significantly influenced by changes in gravity direction and hydrogen filling rate.

• Journal of Hydrogen and New Energy
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• v.34 no.5
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• pp.439-446
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• 2023

In this study, the computational fluid dynamics (CFD) simulations were conducted to verify the cooling capacity of the cryocooler used for pre-cooling of hydrogen gas. Based on the experimental results, the effect of the flow rate on a copper pipe attached to the bottom of the cryocooler was investigated. In this study, the temperature data was calculated through the change of boundary condition for heat flux in the copper pipe. In addition, the cooling capacity of the cryocooler for pre-cooling hydrogen gas was considered by calculating the cooling temperature according to the flow rate in the certified operating range. Consequently the pre-cooing system for hydrogen gas was validated with a reasonable accuracy through CFD simulations.