• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.24 no.3
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• pp.205-212
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• 2014

In this paper, sunroof buffeting analysis for Hyundai simple model(HSM) is studied computationally. For validation, the velocity profile of boundary layer around the opening of HSM was obtained and compared with experimental results. The analysis of sunroof buffeting is done in two parts. First a steady state solution is obtained using the Reynolds Averaged Navier Stokes (RANS) solver, and then the computed flow field information is used as input for CAA++. Second transient simulation by CAA++ is performed for the peak sound pressure levels and peak frequencies of buffeting noise over the ranges of flow velocities. The benchmark results of frequency and sound pressure levels showed the general phenomena and matched well with the experimental data obtained by Hyundai Motor Car.

• Prospectives of Industrial Chemistry
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• v.24 no.4
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• pp.22-35
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• 2021

현재 수소전기차는 승용 및 상용 등 다양한 모빌리티 분야에서 전 세계적으로 이슈가 되고 있다. 환경규제 강화, 신기후체제 출범 등의 변화의 물결에 따라 자동차산업의 패러다임이 친환경으로 전환되고 있으며, 세계적으로 관련 기술 개발 및 보급을 위한 확대 정책이 발표되고 있다. 1990년 초 수소전기차(Fuel Cell Electric Vehicle, FCEV) 기술 개발이 진행되어 1994년 독일 다임러사가 세계 최초로 NECAR1을 개발하였다. 이후 많은 완성차가 상용화를 위해 기술개발이 진행되었으며, 2013년 국내 현대차가 세계최초로 양산차인 투싼 ix 수소전기차를 출시하였다. 1년 이후 다시 일본 도요타에서 세계 최초로 전용 차체를 적용한 미라이 수소전기차가 출시되면서 초기시장이 형성되었으며, 이후 현대차는 NEXO를 2018년에 발표하였다. 전 세계적으로 가장 많이 팔린 수소전기차에 해당된다. 2021년 미라이 2세대가 더욱 진보된 기술을 바탕으로 출시되었으며, 국내 현대차에서도 2세대 수소전기차 출시를 앞두고 있다. 또한 수소승용차 뿐만 아니라 수소상용차 시장이 뜨겁게 부각되고 있으며, 각국에서 수소상용차 기술개발을 진행하고 있다. 본 기획특집에서는 각국의 수소전기차 기술개발 및 보급 정책을 소개하고 국내 기술개발 및 보급 정책의 타당성을 확인하고자 하였다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.21 no.9
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• pp.105-109
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• 2022

In this study, the cause of the acceleration failure of Hyundai Motor's 2.0-liter CRDi engine was analyzed. We tried to find problems through MDA (Measuring Data Analyzer) based on data such as vehicle speed, air intake, and air-fuel ratio obtained during the actual driving process. As a result, it was analyzed that the failure of the EGR valve exceeded the NOx emission standard and caused a decrease in engine output. Through this study, it is possible to reduce the time and cost of unnecessary maintenance and repair, and it is expected that a rapid cause analysis will be possible in the case of new failure diagnosis in the future.

• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.457-458
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• 2024

반도체 칩 부족에 따른 신차 생산 중단 및 중고차 가격 급상승, 항구 파업으로 수입 차량 인도 지연 등 예측 불가능한 사회 현상이 빈번히 발생하는 상황에서도 신속히 대응하며 운영해야하는 자동차 딜러쉽의 총괄 관리자 역할은 매우 중요하다. 본 연구는 캐나다 온타리오 주 내 현대자동차 딜러쉽을 대표하는 8명의 지점장들을 대상으로 설문조사를 실시하였다. AHP 기법을 통해 총괄 관리자에게 가장 중요한 핵심 역량을 파악하였고, 의사 결정, 직원과의 관계, 코칭 및 멘토링 등이 핵심 역량으로 도출되었다. 본 연구 결과는 향후 채용 과정에서 평가 지표로 활용될 수 있고, 현직 총괄 관리자들의 역량 향상을 위한 교육 시스템 구축 및 적용을 통해 딜러쉽의 성공적인 운영과 더 큰 성과 창출에도 도움이 될 수 있을 것으로 사료된다.

• Journal of Labour Economics
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• v.27 no.1
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• pp.27-53
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• 2004

This paper analyzes the two cases of labor disputes (Hyundai Motor in 1998 and Power Generation Companies in 2002) in the period of restructuring, by applying the behavioral theory of labor negotiations as a comparative framework. The paper compares th backgrounds of the labor disputes, core issues, bargaining processes, and evolutionary patterns and consequences of the labor disputes at the two cases. The common features, found in the two dispute cases, are strong mistrust and exclusive bargaining attitude between labor unions and management, little feasibility of contract zone in bargaining proposals by the two parties, heteronomous dispute resolution by the intervention of the government, and the lack of learning effect gained from the experience of labor disputes. This comparative case study identifies that the confrontational labor-management relations at the firm level is re-produced by a regressive process of the following circulation: labor-management distrust $\rightarrow$ interest conflict in bargaining demand $\rightarrow$ exclusive bargaining attitude $\rightarrow$ the experience of antagonistic dispute $\rightarrow$ deepened distrust. In conclusion, four parties-labor unions, management, the government, and public press - are required to make much effort to replace the vicious circle of labor-management confrontation by a virtueous cycle of labor-management cooperation.

• Journal of the Korean Institute of Gas
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• v.27 no.3
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• pp.1-10
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• 2023

Due to the development of the industrial revolution, regulations on exhaust emissions have been continuously strengthened to reduce the rapidly increasing greenhouse gas emissions. The use of environmentally friendly fuels is essential to meet these regulations. Hydrogen has been attracting attention as a future environmentally friendly fuel, but due to its material properties, it faces significant challenges in handling and storage. As an alternative, ammonia has been proposed. Ammonia can be easily liquefied at room temperature compared to hydrogen and has a high energy density. In order to examine the applicability of ammonia as an engine fuel, experiments were conducted to investigate the effects of changes in combustion control parameters in a direct injection ammonia combustion engine. The experiments were conducted by varying two variables: spark timing and excessive air ratio. Observations were made on combustion stability and the trends of exhaust emissions such as nitrogen oxides and unburned ammonia under the conditions of an engine speed of 1,500 rpm and medium to high loads (brake torque of 200 Nm). By optimizing the combustion control parameters, conditions for stable combustion even when using ammonia as the sole fuel were identified, and plans are underway to apply strategies for future expansion of the operating range.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.24 no.3
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• pp.198-204
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• 2014

This paper presents a benchmark test result of an application of computational fluid dynamics(CFD) analysis of automotive sunroof buffeting simulation. Computational analyses of flow over an open sunroof of a simple vehicle model called as HAWT(Hyundai aeroacoustic wind tunnel) model were performed to study the buffeting phenomenon and to predict the buffeting noise level and its frequency. Computations are performed for sunroofs with PAM-FLOW software which is one of powerful CFD code of ESI group. Numerical predictions are compared with result from the tunnel test measurements. It is shown that CFD analysis has great potential for sunroof design and development by predicting buffeting noise.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.6
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• pp.117-123
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• 2018

Automotive headlamps have been continuously developed as one of the most important devices for securing the driver's view, and the LED lamps are getting popular in recent years. However, in case of the LED lamps, because the heat generated by the LED lamps are too high, it shorten the product life and lower the LED efficiency. Therefore, this study was investigated the cooling characteristics of the LED lamp heat sink for automobile by forced convection for LED heat generation control. In order to analyze the cooling characteristics of the heat sink, the temperature distribution results were investigated through the experiment and computational analysis under the increase of the air flow velocity, and the convective heat transfer coefficient was obtained. Also, convective heat transfer coefficient was calculated by the theoretical formula under the same condition and compared with experimental and computational results. From the result of this study, as the air flow velocity around the heat sink fins increased, the convective heat transfer coefficient significantly increased, confirming the improvement in the cooling effect.

• Digital Contents
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• no.8 s.135
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• pp.97-99
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• 2004

일찍 찾아온 무더위가 기승이다. 찌는 듯한 여름밤을 달랠 수 있는 게임으로는‘레이싱게임’이 제격이다. 실제 자동차 경주를 방불케 하는 조작감과 화려한 그래픽, 터질듯한 엔진의 굉음과 격렬한 메탈음악을 들으면서 새벽의 거리를 질주하면 무더위가 싹 가실 듯하다.

• Journal of the KSME
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• v.20 no.2
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• pp.81-83
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• 1980

자동화라는 것은 1788년에 유명한 James Watt의 증기기관에 있어서 조속기에서 처음으로 찾아볼 수 있다고 하며, 그후도 각종기기에서 부분적인 자동제어화된 예를 볼 수가 있다. 그러나, 현대 적이고 본질적인 자동화는 1914년에 Ford 자동차직립공장에서 흐름적립선을 설치하여 다량생산 방식의 근대산업을 개발하여 생산과정을 진정한 의미로 기계화하고 설인간화하였는데 있다고 하며 현대적감독의 자동화라는 말도 1946년에 출현한 transfer machine에 대하여 사용한 것이 처음이라고 한다 여하간 모든 산업에 있어서의 자동화는 현대산업발전의 촉진제로서 역할을 하여 획기적인 변혁을 가져왔고 경제발전의 원동력으로서의 자리를 굳혔을 뿐 아니라 설안간화, 성 력화의 단계를 넘어서 무인화의 영역에 도전하기에 이르렀다. 자동화 무인화의 영역에 도전하 기에 이르렀다. 자동화의 기술은 초기의 기계적방법을 거쳐서 유압식, 전기전자식으로 발전하였 으며, 현대과학기술의 정화인 전산기와 결합되어 종합과학기술로 발전하였고 앞으로 더욱 가속 화될 것이 기대된다.