• Tribology and Lubricants
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• v.38 no.2
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• pp.70-72
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• 2022

In this study, we report on a power system developed as a decelerator for a driving module in an electric vehicle. The system is to be mounted in a limited space. The research focus was on development of miniaturization, light weight, and high power density. In particular, we aimed to minimize the layout of existing external components as integrated or built-in, and to maximize the power density by applying optimal cooling technology to increased requirements for developing modular power systems applicable to various OEM models. South Korean automakers ranked fourth in global electric-vehicle sales in 2020, but domestic sales are relatively slow. Despite government's expansion in subsidies for eco-friendly cars, consumers are delaying purchases after 2021 considering the cost-effectiveness of electric vehicles. In major European markets, the demand for electric vehicles exceeded the demand for diesel cars, and sales of hybrid cars, which used to represent eco-friendly cars, are slowing down as Toyota, started selling electric vehicles. In this study, the internal lubrication characteristics of a decelerator installed in an electric vehicle were analyzed in terms of the deceleration time while driving. By selecting the proper oil and oil viscosity, it was confirmed that there is no problem in lubricating the bearings and gears of the decelerator.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.5
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• pp.139-144
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• 2023

In order to obtain the maximum characteristics of motors such as torque and efficiency, all motors basically use universal inverters designed for each motor's characteristics. However, if you look at the recent research results, you can see cases of SRM(Switched Reluctance Motor) driving studies using 6-switch inverters, which are BLDC(Brushless DC Motor) universal inverters, and research cases of driving 3-phase BLDC motors using 4-switch inverters. Therefore, it is possible to search for research methods by approaching various methods of driving and control that can drive each motor apart from the existing universal inverter. In line with this research trend, in this paper, a C-dump type converter, which is an SRM drive converter, was applied as a drive driver for a BLDC motor, and its characteristics and possibilities were studied.

• The Korean Journal of Archival Studies
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• no.82
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• pp.173-229
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• 2024

An archive is a "representation of actions and activities" that bears different effects depending on its purpose and intention. Also, various archival practices reinforce the political nature of the archive including the subject's purpose and intention. Such effects are not confined to a single event and its records but extend to broader society through interactions. This process is demonstrated more significantly in social conflicts in which stakeholders archive their actions and decision-making process as they compete with other parties. This study examines such archive politics through a case study of the "Ssangyong Motors Strike" in 2009. In "Ssangyong Motors Strike", multiple stakeholders vigorously produced records that reflected each subject's perspective, purpose, and intention throughout the lifespan of the event-prior to, during, and after the primary incident. This article pays particular attention to two archive cases from ex-post investigation and fact-finding processes. One was produced by the Special Investigation TF of Seoul Bar Association and the other by the Korean National Police Agency's Fact-finding Committee of Human Rights Violations. The two cases illustrate the concept of archive effect and the representation of political and social accountability through archiving. This study argues that archives and archival practices induced by the Ssangyong Motors Incident had extended archive effects leading to communal restoration, healing, and social progress beyond the resolution of the immediate conflict and problems.

• 한국기계연구소 소보
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• s.17
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• pp.49-59
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• 1987

• 전기의세계
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• v.29 no.8
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• pp.491-494
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• 1980

• Journal of the korean Society of Automotive Engineers
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• v.27 no.3
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• pp.9-13
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• 2005

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2002.10a
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• pp.33-33
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• 2002

• Journal of Korea Foundry Society
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• v.18 no.6
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• pp.518-527
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• 1998

• Polymer Science and Technology
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• v.6 no.6
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• pp.568-576
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• 1995

• JOURNAL OF ELECTRICAL WORLD
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• no.6 s.114
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• pp.12-17
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• 1986