본 연구는 자동차부품제조기업종사자들의 조직공정성이 직무만족에 미치는 영향에 대한 조직후원인식의 매개효과를 규명 하는데 있다. 선 행연구를 기반으로 한 설문지를 자동차부품제조기업종사자를 대상로 배 포하여 148부가 회수되었으며, SPSS 20.0 통계 분석 프로그램을 사용 하여 통계 분석을 실시하였다. 분석 결과, 조직공정성은 직무만족에 유 의미한 정(+)의 영향을 미쳤으며, 조직후원인식은 매개 효과가 있는 것 으로 나타났다. 이에 따라 첫째, 조직공정성이 강화될수록 직무만족에 미치는 영향이 있는 것을 알 수 있었다. 둘째, 조직후원인식이 조직공정 성과 직무만족간의 매개효과를 확인할 수 있었고 이는 조직구성원들의 노력과 성과에 가치를 두고 복지를 증대시키면 조직후원인식을 통해서 직무만족을 더 잘 할 수 있음을 의미한다. 이는 조직후원인식을 통하여 조직공정성을 강화함으로써 직무만족을 향상 할 수 있는 가능성을 시사 한 것으로 볼 수 있다.

In order to determine the future direction of Busan City’s tree planting policy in accordance with changes in automobile fuel and air pollutants, this study selected representative tree species planted in Busan and identified the biogenic volatile organic compounds (BVOCs) emission rate and characteristics of each species. First, representative tree species were selected for each street tree species, forest tree species, and park tree species, and the emission rate and major components of BVOCs were investigated for each tree species. Furthermore, by comparing the ozone generation potential (POCP) for each tree species, tree species with a low emission rate were selected. According to the POCP comparison, P. yedoensis, G. biloba, Z. serrata and C. retusus were selected as roadside tree species, P. densiflora and C. obtusa as forest species, and A. palmatum, C. japonica, and Q. myrsinaefolia were deemed suitable for park species. However, in the case of P. occidentalis, Quercus, and M. glyptostroboides, the emission rates of BVOCs were found to be high. Despite this, these tree species were found to display excellent CO2 absorption and carbon storage. The concentration of NOx in the city center is likely to decrease due to the current trend of transitioning to eco-friendly cars worldwide, resulting in less cars that rely on fossil fuels. Therefore, in the current climate where NOx emissions are still high, planting tree species with a low BVOCs emission rate would be an optimal approach. On the other hand, if the NOx concentration in the city is found to be very low due to changes in automobile fuel use, planting tree species with excellent BVOCs emission capacity and CO2 absorption would be ideal.

정보통신기술(Information and Communication Technology)과 기존 교통수단의 융복합으로 수소자동차, 자율주행자동차 등과 같은 새로운 교통수단 등장으로 광역 이동과 같은 이동성이 향상될 것으로 기대되고 있다. 또한, 보다 빠른 광역 이동성 확보를 위해 BRT 전용차로 도입에 대한 논의가 계속되고 있으므로 본 연구는 BRT 전용차로 구간에서 자율주행자동차의 혼입률 및 대중교통 전환율에 따른 시나리오를 설정해 서비스수준 분석을 기반으로 잉여차로 발생 가능성을 확인하였다. 더불어, 미래교통량 증가와 자율주행 기술 의 발전이 BRT 전용차로 운영 구간에 미치는 변화를 분석해 도로의 자산가치 산정을 목적으로 하고 있다. 설정한 시나리오에서 도로 가 기능을 발휘할 수 있는 일정한 서비스수준(Level of Service, LOS)를 유지하는 자율주행자동차 혼입률 수준을 파악하였으며, A~F 의 6단계로 구분하여 결과를 도출하였다. 도로의 자산가치 산정방법은 국가회계기준에서 제시하고 있는 토지의 대체적 평가방법 4가 지 방법과 보다 객관성을 확보한 새로운 자산가치 평가방법을 준용하여 도로의 자산가치를 산정하였다. 분석 결과, 간선도로 서비스수 준을 통해 BRT 전용차로를 시행하면서 연속류 구간에서는 자율주행자동차 혼입률이 75%되는 경우 편도 3차로에서 편도 2차로로 1차 로 감소가 이루어져도 현재의 서비스수준을 유지할 수 있으며, 단속류에서는 자율주행자동차의 혼입률이 50%되는 시점에 편도 4차로 에서 편도3차로 1차로 감소 시 동일한 효과를 발휘할 수 있음을 확인하였다. 즉, 연속류 구간에서 자율주행자동차 비율이 75% 및 단 속류 구간에서는 자율주행자동차의 비율이 50%되는 시점에서 1차로에 대한 도로 자산가치가 발생할 수 있음을 알 수 있었다. 이와 같은 잉여차로는 보행약자를 위한 보행 공간 및 자전거도로, 개인형이동장치((Personal Mobility, PM)전용도로, 완충녹지 등의 완전도 로로 활용될 수 있음을 시사하고 있다.

The electrification of transportation is expected to greatly contribute to achieving the global climate change target. This study analyzed technological competitiveness in the fuel cell electric vehicle (FCEV) field based on patent family and citation index. Technology analysis was conducted by dividing FECV into six sub-technology areas based on IPC with fuel cell system, fuel cell technology, vehicle system, hydrogen storage and fueling, catalyst technology and etc. The largest number of patents are being filed in the fuel cell system technology field, and the fields with high growth rates over the past 10 years (2012-2022) were vehicle systems (12.4%) and hydrogen storage fuel field(11.5%). As of 2021, among global automakers, Toyota ranks the first in patent applications for FECV followed by Hyundai Motors in Korea, followed by Honda and Audi, with an average annual growth rate of 19.8%, the highest among competitors.

In this study, a numerical analysis study was conducted on the flow characteristics according to the internal flow path change and differential pressure of the hydrogen shut-off valve, and through this, the pressure loss characteristics and flow coefficient of the hydrogen shut-off valve were predicted. ANSYS CFX program was used to predict the flow characteristics of the hydrogen shut-off valve. When the flow path gap was 1.3 mm, the design conditions of the hydrogen shut-off valve were satisfied, and the value of the flow coefficient of the valve was about 1.53. As the inlet pressure of the hydrogen shut-off valve increases, the outlet flow rate increases, but regardless of the inlet pressure, the flow coefficient of the valve is almost constant, ranging from 1.53 to 1.56, indicating that it is the inherent flow coefficient of the designed hydrogen shut-off valve.

Internal combustion engine is the main source of environmental pollutants and therefore advanced technology is required to reduce harmful elements from the exhaust gases all over the world. Especially, when the exhaust gas is released from the automotive muffler, exhaust noise has many bad influence on the surrounding environment. In order to reduce the exhaust noise, it is necessary that automotive muffler must be designed for best exhaust efficiency. The sound insulation room was installed for the analysis of an acoustics characteristics of the noise from automotive muffler, in this study. Exhaust gas noise, noise distribution characteristics, pressure and temperature of exhaust gas were investigated with the change of annulus temperature of air cooled annulus automotive muffler and cooled annulus automotive muffler. The following results were obtained with this study. From the frequency analysis of automotive muffler, high noise distribution was observed in the range 100~2000Hz. It means that the noise in this range has an dominate influence for the overall noise. Noise reduction of automotive muffler was affected by the temperature of annulus. It is caused the result that the high temperature and pressure of exhaust gas are changed lower by the drop of annulus temperature. The tendencies of noise, the temperature and pressure of exhaust gas are similar to the performance curve of engine. Exhaust gas pressure is determined by the r.p.m. of engine and affected by the cooling performance of automotive muffler.

In the case of a rear-wheel drive vehicle, a propeller shaft is installed to transmit the driving force of the engine. At this time, the propeller shaft is divided into 2 or 3 pipes, and the bearing is mounted on the vehicle body. And the end of the propeller shaft is connected to the rear differential and connected to the body through the chassis. Due to this complex structure, the propeller shaft must be highly balanced and the mounting angle must be well maintained. However, depending on the driving conditions of the car, various noise and vibration problems occur due to the aging of the parts and the propeller shaft. Hyundai Motor Company's maintenance center uses 'Noise Observer' to resolve various noise and vibration customer complaints. This paper describes the mechanism of vibration problems caused by unbalance of the propeller shaft and the diagnosis process using a 'Noise Observer'.

PURPOSES : This study is to initiated to estimate the impact of mixed traffic flow on expressway section according to the market penetration rate(MPR) of automated vehicles(AVs) using a enhanced intelligent driver model(EIDM). METHODS : To this end, microscopic traffic simulation and EIDM were used to implement mixed traffic flow on basic expressway section and simulation network was calibrated to understand the change of impact in mixed traffic flow due to the MPR of AVs. Additionally, MOEs of mobility aspects such as average speed and travel time were extracted and analyzed. RESULTS : The result of the impact of mobility MOEs by MPR and level of service indicated that 100% MPR of AVs normally affect positive impact on expressway at all level of service. However, it was analyzed that improvements in the level of service from LOS A to C are minimal until the MPR of AVs reaches 75% or higher. CONCLUSIONS : This research shows that impact of MPR of AVs using EIDM of mixed traffic flow on basic expressway. Increasing MPR of AVs affects positive impact on expressway at all level of services. However, MPR from 25% to 75% of AVs in LOS A to C shows minimal impacts. Therefore, to maximize the effectiveness of AVs, appropriate traffic operation and management strategies are necessary.

ZnO/Cu/ZnO (ZCZ) thin films were deposited at room temperature on a glass substrate using direct current (DC) and radio frequency (RF, 13.56 MHz) magnetron sputtering and then the effect of post-deposition electron irradiation on the structural, optical, electrical and transparent heater properties of the films were considered. ZCZ films that were electron beam irradiated at 500 eV showed an increase in the grain sizes of their ZnO(102) and (201) planes to 15.17 nm and 11.51 nm, respectively, from grain sizes of 13.50 nm and 10.60 nm observed in the as deposited films. In addition, the film’s optical and electrical properties also depended on the electron irradiation energies. The highest opto-electrical performance was observed in films electron irradiated at 500 eV. In a heat radiation test, when a bias voltage of 18 V was applied to the film that had been electron irradiated at 500 eV, its steady state temperature was about 90.5 °C. In a repetition test, it reached the steady state temperature within 60 s at all bias voltages.

전기자동차의 빠른 확산은 지구온난화와 자연재해 대응을 위해 국제적으로 중요한 과제이다. 대중화를 위해 “캐즘(Chasm) 극복”은 필수적이나, 선행연구들은 전기차 초기시장 분석이 대부분이며 캐즘 단계의 연구는 다소 제한적이다. 본 연구는 전기차 초기 단계를 벗어나는 국내시장에서 소비자의 전기차 구매 주요 저해 요인과, 이에 영향을 주는 소비자의 인구통계학적 특성 및 자동차 관련 경험을 설문과 통계 기법을 통해 심층 분석하였다. 연구 결과, 한국 전기차 시장은 캐즘 전 단계로 판단되며, 전기차의 “기술에 대한 낮은 신뢰성”, “경제성에 대한 의문”, “충전-운전 불편성”이 전기차의 주요 수용 저해 요인으로 확인되었다. 지역에 따른 고속/완속 충전 인프라의 적절한 구축, 교육과 홍보를 통한 전기차의 인식개선, 전기차 수용에 우호적인 얼리어답터(Early adopter)의 전기차 수용 촉진은 캐즘을 극복하는 과정에서 중요한 역할을 할 것으로 판단된다.

In this study, In this study, structural analysis of a fuel tank for an SUV (sports utility vehicle) was performed for crack prevention design. Reservoir tank analysis was conducted for crack prevention design, and improvement measures for weak areas were discovered and reflected in the design. Pressure analysis was performed on the existing model to analyze weak areas. As a result of analysis through various design changes, it was found that the strength problem of the reservoir tank was due to the discontinuity of the rib inside the tank, and to improve this, it was necessary to minimize the discontinuity section.

Recently, as ESG management has become an important issue, major companies in the automotive parts manufacturing industry are conducting ESG evaluations of their suppliers for the purpose of supply chain management. The results of these evaluations are being incorporated into contractual agreements. However, many small and medium-sized enterprises(SMEs) are lacking in their capacity and resources to effectively respond to ESG evaluations. Furthermore, existing ESG management guidelines do not provide an industry-specific guidance, making it necessary to establish industry-specific guidelines that SMEs can refer to. Therefore, in this study, the evaluation Indicators of ESG supply chain assessments are surveyed, which is conducted by domestic major automotive parts companies and global automobile manufacturers. Then 56 supply chain ESG evaluation Indicators are derived. Also, ESG management indicators for SMEs is analyzed through the Importance-Performance Analysis(IPA), based on an interview of expert groups. Therefore, this study could propose industry-specific ESG guidelines, based on the results of the derived indicators, which reflects the need for SMEs to practice ESG management within certain boundaries.

This study aims to understand the current status of exemptions for traffic accidents during the return of emergency vehicles and to provide suggestions for improvement. A survey was conducted on 3,500 firefighters to investigate the perception of traffic accidents during the return of emergency vehicles, and responses from 505 participants were analyzed. Based On the demographic characteristics and perception of the participants, frequency analysis and variance analysis were used as research methods to analyze basic statistics and the current situation. The results showed that firefighters have concerns and anxieties about traffic accidents during the return of emergency vehicles, and the need for applying exemptions and enacting explicit legal provisions was statistically confirmed. Based on these results, we suggest a policy for exemptions to improve the preparation for re-deployment and to alleviate the concerns and anxieties of firefighters.

This study is to identify the maintenance service quality of eco-friendly cars, which are rapidly increasing recently. Research is conducted by synthesizing research from the perspectives of internal employees and external customers by using the service profit chain model. Specifically, it is to study the overall structural relationship between internal customer satisfaction, physical quality, interaction quality, outcome quality, external customer satisfaction and long-term orientation. For the study, 202 questionnaires were collected from internal employees and 204 questionnaires from external customers. The results of testing the research hypotheses targeting the internal employee group are as follows. As a result of testing hypothesis 1, internal customer satisfaction has a significant positive (+) effect on physical quality and interaction quality. As a result of testing hypothesis 2, the service quality of eco-friendly car maintenance has a significant positive (+) effect on each other. As a result of testing hypothesis 3, physical quality and outcome quality have a significant positive (+) effect on external customer satisfaction. The results of testing the research hypotheses targeting an external customer group are as follows. As a result of testing hypothesis 2, in the relationship between eco-friendly car maintenance service quality, physical quality has a significant positive (+) effect on interaction quality, and interaction quality has a significant positive (+) effect on outcome quality. As a result of testing hypothesis 3, interaction quality and outcome quality have a significant positive (+) effect on external customer satisfaction. As a result of testing Hypothesis 4, external customer satisfaction has a significant positive (+) effect only on intention to reuse. Finally, as a result of examining the difference in perception between the internal employee group and the external customer group in eco-friendly car maintenance service quality and external customer satisfaction, it was verified that there was a significant difference only in outcome quality and external customer satisfaction.

본 연구는 팀발명의 정도에 있어서 상당한 차이를 보이면서 전자산업, 자동차산업에서 가장 많은 특허를 출원해온 삼성전자와 현대자동차 발명자들을 대상으로 네트워크 특성들이 발명 자들 간 혁신성과 차이를 가져오는지를 분석하였다. 네트워크 내에서 더 많은 발명자들과 연결 되어 있을수록 더 높은 혁신성과를 보였다. 기존 문헌들이 산업내 및 산업간, 그룹내 및 그룹외 파급효과를 조직 수준에서 다루었는데, 본 연구는 이러한 논의를 발명자 수준으로 확장하였다. 본 연구는 네트워크로부터의 파급효과풀을 새롭게 추가하여 네트워크 내외, 그룹 내외, 산업 내외의 3가지 차원에서 파급효과풀들을 구성한 후 각 파급효과풀들이 미치는 효과를 분석하였 으며 서로 간에 비교하였다. 발명자 수준에서 다양한 파급효과풀들이 혁신에 미치는 효과가 확인되었다. 본 연구의 결과는 발명자의 네트워크 특성들과 파급효과풀들이 발명자의 혁신 성과에 대한 예측에 활용될 수 있음을 시사한다.