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[차량운동성능부문] 유니버설 조인트의 스파이더 교차각에 따른 조향축 각속도 변화
김정배(Jungbae Kim),유완석(Wansuk Yoo),심재준(Jaejun Sim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Since the steering mechanism should be designed to transmit the steering effort of the driver to the steering rack, it is required to design a spatial linkage. In the steering link type of rack and pinion, an intermediate shaft is necessary. In this paper, the angular velocity of the steering column according to the twist angle of the intermediate shaft is obtained via computer simulation. The angular velocity change according to the spider cross angle in intermediate shaft is also investigated.
김정배 ( Jungbae Kim ) 한국미국사학회 2015 미국사연구 Vol.42 No.-
베트남전쟁에서 미국과 소련의 관계는 베트남전쟁의 성격과 냉전체제를 이해하는데 매우 중요하다. 지금까지 그들의 관계는 적대적인 것으로 간주되었다. 하지만 그것은 하나의 ‘믿음’일 뿐 그들은 사실상 의존적이고 협력적이었다. 미국과 소련은 베트남전쟁이 기본적으로 북베트남과 미국의 사이의 전쟁이며, 양쪽 모두 행위의 정당성이 있으며, 반드시 평화적 방법으로 전쟁을 끝내야 한다는데 공감했다. 소련은 무엇보다 중국을 고립시키고 사회주의동맹 내부에서 자신의 위상을 재고하기 위해 북베트남을 지지하고 지원했다. 그러나 북베트남에게 영향력을 행사할 처지는 아니었다. 북베트남이 주요 정책을 독립적이고 주체적으로 결정했기 때문이다. 미국은 소련의 입장과 처지를 충분히 이해했다. 그렇지만 소련 이외에 달리 도움을 요청할 곳이 없었던 미국은 소련에게 매달릴 수밖에 없었다. 말하자면 미국과 소련은 냉전 진영의 우두머리라기보다는 세계적 강대국으로서 행동했던 것이다. 베트남전쟁에서 미국과 소련의 인식과 태도는 통념으로는 납득하기 쉽지 않다. 그래서 ‘도대체 냉전은 무엇이었지?’ 라는 의문이 생길 수 있다. 이러한 의문은 냉전에서 약소국이 강대국을 초대한 측면을 지적하거나 두 진영 내부 일부 국가의 자율성을 강조한다고 해결될 문제가 아니다. 기존의 냉전체제 인식에 대한 진지한 재검토가 필요해 보이는 이유이다. US-USSR relations during the Vietnam War is one of the most important factors to understand the developments and characters of the Cold War as well as the Vietnam War itself. Many of the established scholarships have regarded their relations as a competitive enemy which did control two opposing camps, capitalism and socialism. But, these interpretations are a only discoursive ‘belief’ that not based on historical facts. Washington and Moscow had a deep sympathy with that the Vietnam War was a conflict between the US and North Vietnam, two sides had ample reasons for their behaviors, and the War must be resolved through negotiated settlement. Moscow’s purposes of political support and military aid for North Vietnam were to isolate Red China and to raise their status within the Socialist Camp. The USSR, however, had not much influence to North Vietnam, because of their rejection to a kind of compelling advices from Moscow and Beijing. In spite of understanding fully Moscow facing their dilemma, Washington turned into an almost desperate appeal for the Soviet Union to serve as a an intermediary in Vietnam. In a word, during the Vietnam War, the US and the USSR had a very cooperative and interdependent such as traditional powers rather than two Cold War giants. The perceptions and behaviors of Moscow and Washington during the Vietnam War can not understanded with the conventional wisdom regarding the Clod War. Therefore, it seems to be required to raise renewedly a question about ‘what was the Cold War all about?’
1.4리터급 가솔린 엔진용 터보차저의 기계마찰손실 이론계산 및 시험적 분석
이인범(Inbeom Lee),김구성(Kusung Kim),김정배(Jungbae Kim),최복록(Boklok Choi) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
Most turbochargers are supported by two oil lubricated journal bearings and a thrust bearing. This is a main cause of the mechanical friction losses which strongly influence on the mechanical efficiency of the turbocharger. In this paper, theoretical and experimental methods were used to identify the mechanical friction losses of the torbo rotor. The Petroff’s equation was used for numerical calculating the mechanical friction losses in theoretical method. The calorimetric measurement technique was used in experimental method. In order to know the mechanical friction losses of two radial journal bearings without a thrust bearing, the experimental measurement was proceeded in the range which has no axial thrust loads. The turbocharger for a 1.4L gasoline engine was used to measure and calculate the mechanical friction losses and the SAE 10W-30 grade engine oil was used for lubricating the Bearings. In the results of this paper, it was identified that the magnitude of mechanical friction losses due to the oil lubricated bearings. Through the comparison of theoretical result and experimental result, that was verified.