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하이브리드 자동차의 직류변환장치(LDC) 성능 및 신뢰성 평가에 대한 연구
김철수(Chulsoo Kim),박광민(Gwangmin Park),지성원(Sungwon Ji),김찬중(Chanjung Kim),이봉현(Bonghyun Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Low DC-DC converter(LDC) in HEV plays a role in charging the auxiliary battery as a low voltage from the main battery charged to the electric driving motors regenerative energy during deceleration and braking of the vehicle. The charged auxiliary battery supplies power to the electronics such as headlamps, air conditioner, power windows, and electric power steering. LDCs output of degradation and failure in the vehicle can have severe impact on various electronics during driving. LDCs for HEVs compared to general industrial DC-DC converters need to meet the performance of high-efficiency power conversion, vibration, and heat resistance properties and EMI to ensure the reliability within the limited volume to be mounted in the vehicle. In this paper, reliability assessment and performance evaluation factor are established for developing the LDC in HEV. Also the performance testing and analysis about the conventional LDC currently used in a HEV is performed on the status of the vehicle and device. The result will be uesd to compare the developed LDCs performance.
김철수(Chulsoo Kim) 한국종교학회 2014 宗敎硏究 Vol.74 No.2
There are still plenty of debates and discussions about the BoCheonGyo, the typical example of the so-called new religions which came into existence under the Japanese colonial rule in Korea. Main issues of debate about the BoCheonGyo are the matter of quasi-religions, its relation with the National Independent-Movement, and the effect of religious policies by Japanese colonialist power. Engaged in these matters, it seems that a negative sentimentality against BoCheonGyo was already firmly established in that times, and also religious policies during the colonial period included the plot to brainwash and assimilate Koreans through the manipulation of religion. This study intends to explain the rise and fall of the BoCheonGyo as a religious movement, and to evaluate the perspective of the Japanese colonial power on the BoCheonGyo. Especially this is based on a raw material, 『The Introduction to BoCheonGyo』, issued by a provincial authority(Jeon-Ra-Buk-Do) of the Japanese Government-General in Chosun in 1926. But, despite the fact that the BoCheonGyo was regarded as a quasi-religion, its membership increased in the 1920s after the March 1st Independence Movement. So it is evident that BoCheonGyo suffered a serious damage done by the Japanese Colonial Power. It is noteworthy that it was condemned as a premodern and anti-social quasi-religion when the Japanese colonial power intentionally spread malign propaganda to oppress the religion. Based on text analysis of 『The Introduction to BoCheonGyo』, this study examines religious policy that the Japan Government-General in Chosun designed.
그린카용 인버터 전력모듈의 열전달 해석 및 평가에 대한 연구
김철수(Chulsoo Kim),이준호(Junho Lee),이기수(Geesoo Lee),이홍섭(Hongseop Lee),김찬중(Chanjung Kim),이봉현(Bonghyun Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Since the high-powered power modules for use in motor inverter and DC-DC converter of green cars such as xEVs require the power chips of higher current and thermal density, it is very important to design the power chips considering to its effective thermal dissipation path. Thermal resistance is a key factor in the power module package design for the effective thermal dissipation path from its junction to base plate. Generally the more the thermal resistance decreases, the more the allowable dissipation power and current increase. The thermal resistance of the power module largely depends on the thermal properties of a direct bond copper material. In this paper temperature rise characteristic and thermal resistance are evaluated through the heat transfer analysis on the 2-pack power module for use in inverter of the green car. The experimental measuring method of the thermal resistance referred to the international testing standard is introduced. The heat transfer analysis is conducted about the various direct bond copper materials of the power module package with the commercial code.
부산의 공공건축 디자인 발전 방향 개선에 관한 연구 - 부산 현대미술관 중심으로 -
김철수 ( Kim Chulsoo ) 한국공간디자인학회 2021 한국공간디자인학회논문집 Vol.16 No.4
(Background and Purpose) The rapid growth of cities has also increased the yearning for eco-friendly life. However, it is very difficult for modern people to have time and time to live a nature-friendly life. Therefore, public architectural design pursuing green design, which emphasizes ecological problem solving, becomes an important means of solving social problems through design.(Ansongjo 2020.04) This study aims to present the direction of municipal architecture in which humans can lead to greener lives through the Green Building Design Study, which improves the quality of life of citizens living in Busan. This study was conducted by the Busan Museum of Modern Art among public architectural designs. (Method) The research methods first defined the concepts and orientations of public architecture through theoretical review and prior research, and classified the concepts of green building into four trends: eco-friendly design (EFD), health-oriented design (HCD), practical design (PRD), and AAD (art, aesthetic design, art & aesthetic design). Next, the current status of the Busan Museum of Modern Art was investigated through literature research and field surveys, and problems were derived by utilizing the trend elements of the buildings drawn through case studies. Finally, the design improvement plan of Busan Museum of Contemporary Art was proposed by improving the problems discovered earlier. (Result) in order to give a concise and clean feeling, the building was designed with a right angle model, and the health and emotional space was separately created to promote the health of citizens. In addition, green space was made to relieve stress among urbanites and eco-friendly designs were made using planting on the outer walls. Theme colors and roof colors were proposed according to the color guidelines of civic design, and the interior of the building was constructed with eco-friendly public space by providing emotional comfort using plantar. This study focused on revitalizing the spatial functions of the Busan Museum of Modern Art using the design of the green building. (Conclusion) It wanted to create a livable city where environmental-friendly elements and aesthetics were built at the same time by providing a cultural and public place environment called art and urban convergence and providing cultural images and ecological elements. In addition, in order to provide a better environment for citizens, the design proposal was carried out with elements suitable for green buildings. Therefore, green public space was made to relieve stress among urbanites, and eco-friendly design results were derived by using planting on the outer walls of buildings. The interior was intended to provide emotional comfort. The rectangles were constructed efficiently to increase the rearrangement and utilization of the space, and the results were derived to enhance the convenience of visitors by providing a clean aesthetic feeling.