• 한국자동차공학회논문집
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• 제22권3호
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• pp.19-24
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• 2014

This study, the exchange value of the car after the repair, which affects the valuation elements and repair characteristics factors were investigated. Based on this specific accident damaged condition of the car, repair range, repair methods, repair costs, market transactions, taking into account the vehicle's depreciation appraisal method is proposed.

• 기술사
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• 제45권4호
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• pp.57-61
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• 2012

• 기술사
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• 제34권3호
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• pp.28-32
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• 2001

Using the CNG(compressed natural gas) and LPG(liquified petroleum gas) as the automotive fuel will be expanded because of their clean effect to the environmental air qualify. But these programs of gas using expansion would have a difficulty due to public consideration of gas utilities as a big hazard. The Ministry of Environment has an ambitious plan to substitute more than 25,000 buses with CNG and ensure more than 200 CNG refueling stations as well by the year of 2007. However, it is very difficult to establish new CNG and LPG refueling stations because of expanded safety distance than ever before by several major explosion accidents.

• 기술사
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• 제37권5호
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• pp.42-46
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• 2004

Automobile industry with history of more than 100 years is totally influencing all the economic environments and has very important wellbeing role in the World in every country of the world. Korean Automotive industry in production has only about 40 years but ranked remarkably 6th biggist in the world in the year of 2003. Nowadays The auto, industry has changed into buyer's market in competitively global battle fields and also is changing industry paradigm in product, sales, production, colarboration & emerging, etc. BRICs(Especially China)are rapidly emerging as main producers and customers in new big markets. Korea Auto. Industry faces crictical problems such as higher salary, furious labor union's striking lack of raw material, evasion of 3D works with studying engineering by students which are the key pending agenda that should be overcome for prosperous growth and development of achieving US20,000 GNP.

• 대한공업교육학회지
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• 제33권2호
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• pp.192-217
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• 2008

차량기술사들은 자동차산업의 현장에서 신제품기획, 마케팅, 연구개발, 제조 및 관리 등의 전문적인 업무를 수행한다. 이들의 전문 기술역량은 기업과 조직의 경쟁력을 증진시키는 원동력이다. 이 연구는 차량기술사들의 전문적 업무역량 특성과 중요도를 규명하여 자동차 기술 분야의 자격검정과 공학교육을 효율적으로 연계할 수 있는 기초자료를 제공하는 데 목적이 있다. 세부 연구문제는 첫째, 전문가(차량기술사, 자동차 관련 전공 대학교수, 자동차 전문가)들은 추론된 차량기술사의 전문적 업무역량별 중요도를 어떻게 인식하고 있는가? 둘째, 차량기술사의 업무역량에 관한 중요도 인식에 있어서 응답자의 소속집단(차량기술사, 자동차공학 전공 대학교수, 자동차 전문가)간에 차이가 있는가? 이다. 연구자들은 현직에 근무하고 있는 차량기술사 등 자동차 신제품 개발관련 전문가 협의 및 개인면담을 통해 차량기술사의 전문적 업무역량을 추출한 다음, 차량기술사 108명, 자동차 및 기계공학전공 대학교수 49명, 기업체의 자동차 전문가 55명을 대상으로 설문지를 배포하여 총 152명(72%)으로부터 설문지를 회수하여 분석하였다. 차량기술사의 전문적 업무역량에 대한 설문지는 영역 및 항목별로 빈도 및 변량분석을 실시하였다. 연구결과는 제동장치설계, 프로젝트진행리더십, 미래예측과 변화관리, 디젤엔진설계, 환경대책, 제품기획과 안전에 대한 기술이 가장 중요한 것으로 나타났고, 인사총무와 재무회계, 노무관리 등에 대해서는 중요도를 낮게 인식하고 있었다. 또한 업무영역평균의 집단별 중요도는 섀시설계영역, 엔진 변속기설계영역, 제품기획 마케팅영역, 자재 물류 품질관리영역, 디자인 차체 의장설계영역, 판매 정비 및 경영지원영역, 소재 및 엔진제조영역, 프레스 및 조립공장 제조 영역 순으로 나타냈다. 자동차개발업무관련 차량기술사의 전문적 업무역량중 고객편익과 안전관련 신기술 응용력, 경쟁력 있는 신제품개발 능력의 중요도가 높았다. 응답집단별로는 교수집단이 타집단 보다 모든 항목에서 중요도 평가 평균값이 높았고, 다음은 차량기술사, 차량전문가 순으로 나타났다.

• 한국자동차공학회논문집
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• 제15권4호
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• pp.161-170
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• 2007

As one of the major handling performances of the vehicle and tire, the steering feel is very important in the high speed where safety and refinement is a major concern for the drivers. This paper presents both subjective and objective techniques for the assessment of the steering feel including the on-center feel and steering response. For this, subjective evaluation method of the steering feel was studied at first and then objective parameters were selected by considering the process by which the steering feel is evaluated subjectively. From statistical analysis of subjective and objective data for the several vehicles and professional drivers, it was found that the subjective assessment of the steering feel could be successfully explained by means of the suggested objective parameters. Also, the main objective parameters related to the subjective assessment of the steering feel could be found.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계 학술대회논문집(수송기계편)
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• pp.174-179
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• 2005

In automotive engineering, the brand sound is one of the important advantage strategy in a car company. For the design of brand sound, the selection of descriptive word for a car sound is one of major works in automotive sound quality research. In paper, booming sound and rumbling sound, which are professional words used by NVH engineers are used for the design of brand sound. We employed sound metrics which are the subjective parameter used in psychoacoustics. According to most research results, the relationship between subjective evaluations and sound metrics has nonlinear characteristics and is very complex. In order to link these subjective evaluations to sound metrics, the artificial neural network technology has been applied to two-dimensional sound quality index for a passenger car. These indexes is used for 46 passenger cars, which are samples of famous cars in the world. Also the preference in car sounds is evaluated by the trained NVH engineers. We coupled this preference with booming and rumbling sounds by using artificial neural network. In future, the two -dimensional sound index and preference index are very useful fur the development of brand sound in passenger cars.

• 한국생산제조학회지
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• 제24권3호
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• pp.294-301
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• 2015

Oil filters for vehicular parts are used under high and low temperatures as the engine is cooled, and defects can be generated with repeated changes in the operating environment and with changes in the shape, such as very high internal losses for the bolts. Visually checking for defects inside a bolt is impossible. Nondestructive evaluation methods such as eddy current testing (ECT) are recommended as a more effective way to examine inside a bolt and detect surface defects in a short amount of time. In this study, the fit bobbin coil eddy current probe was applied to checking the bolts. The bolt parameters were calculated by using a COMSOL analysis program to obtain parameters for professional interior design and fault diagnosis.

• 한국소음진동공학회논문집
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• 제16권5호
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• pp.457-469
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• 2006

In automotive engineering, the brand sound is one of the important advantage strategies in a car company. For the design of brand sound, the selection of descriptive word for a car sound is one of major works in automotive sound quality research. In this paper, booming and rumbling sound, which are professional words used by sound and vibration engineers are used for the design of brand sound. We employed sound quality metrics, which are used in the psychoacoustics. By most research results, the relationship between subjective evaluations and sound quality metrics has nonlinear characteristics. In order to correlate these subjective evaluations with sound quality metrics, the artificial neural network technology has been applied to two-dimensional sound quality index for a passenger car. These indexes are used for 46 passenger cars, which are samples of the famous cars around the world. Also a preference evaluation for car sound was carried out by sound and vibration engineers. We coupled this preference with booming and rumbling sounds by using artificial neural network. In future, the two dimensional sound and preference index will be very useful to develop brand sound in passenger cars.

• 한국기계가공학회지
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• 제19권12호
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• pp.34-41
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• 2020

Ready-mixed concrete is unconsolidated concrete typically transported to construction sites by using mixer trucks. A proper rotation of concrete is necessary to prevent its solidification in mixer trucks during transport: in accordance with the manufacturing method and quality inspection prescribed in KSF4009, this movement is maintained after the manufacturing of concrete in professional production plants and the addition of water, solid materials, and admixtures. Unfortunately, mixer truck parts wear out over long periods of time. In order to improve the wear resistance of the main part of mixer trucks, we used a steel plate with good wear resistance or partially added a reinforcement plate. In this study, we first tested the properties of concrete (as required for the DEM), and then carried out mixing and discharge simulations to define the actual operating conditions of mixer trucks. For each condition, we calculated the amount and location of wear. The reliability of our results was finally verified by comparing them with the measurement values. Overall, this study provided basic data for an optimal design of mixer trucks: one that would reduce the vehicles' weight and production costs.