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자동차엔진 경량화용 금속기 복합재료의 피로균열진전거동에 관한 연구
정재욱(Jaewook Jung),최용범(Yongbum Choi),박원조(Wonjo Park),허선철(Sunchul Huh),이광영(Kwangyoung Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Metal matrix composites had generated a lot of interest in recent times because of significant in specific properties. It was also highlighted as the materials of frontier industIy because strength, heat-resistant, corrosion-resistant, wear-resistant were superiored.<br/> In this study Fatiuge crack growth behavior tests on compact tension specimen(haIf-size) of thickness I2.5mm were conducted by using sinusoidal waveform. Compact tension specimens (half-size) were used and fatigue crack growth behavior daJdN and stress intensity factor range L1 K were analyzed concerning to the R value of 0.1 and 0.05. In order to find out the value ΔK, load amplitude constant method was applied by the standard fatigue testing method describes in ASTM E647-95a As the results of this study, Fatigue crack growth behavior increased with in creasing the load ratio, Consequently, Fatigue life was observed roughly in the order of AC4CH> nobiner> Si0₂, independently on crack propagation direction and stress ratio.
자동차용 SUP-9 스프링강의 파괴인성치에 미치는 압축잔류응력의 영향
정재욱(Jaewook Jung),박원조(Wonjo Park),허선철(Sunchul HUh),이광영(Kwangyoung Lee),하경준(Kyungjun Ha) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the steel parts used at the aerospace and automobile industries are required to be used light weight parts. Therefor, used material, steel have to be a high stress, which is an indispensable condition in this field. At the consideration of parts design, high hardness of the lightweight parts have an benefit of saving fuel and material. A high stress of metal has a point of difference according to the shape of design, external cyclic load and condition of vibration. A crack generates on the surface of metal or under yield stress by defect of inner metal defect or surface defect and slowly, this crack grow stable growth. Finally, rapidity failure phenomena is happen. Fatigue failure phenomena, which happen in metal, bring on danger in human life and property. therefor, antifatigue failure technology take an important part of current industries Currently, the shot peening is used for removing the defect from the surface of steel and improving the fatigue strength on surface. Therefor, this paper investigated the effect on frcature toughness using shot peening which is improve the resistance of crack growth and crack expansion rate by fatigue that make a compressive residual stress on surface.<br/>
정재욱(Jung, Jaewook),박현석(Park, Hyunseok),전윤석(Jeon, Ywunseok) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
FCEV(Fuel Cell Electric Vehicle)는 연료전지스택의 각 셀에서 반응하는 화학에너지를 전기에너지로 변환하여 차량을 구동하는 시스템이다. 이러한 연료전지 셀이 정상적인 발전이 되지 않을 경우 비정상적인 전압이 발전되고 이것을 방치한다면 연료전지 스택의 영구적인 고장을 야기할 수 있다. 이를 방지하기 위해 SVM(Stack Voltage monitor) 제어기는 각 셀의 전압을 측정하고 그 정보를 상위 제어기인 FCU(Fuel cell Control Unit)에 전달한다. 이에 FCU는 연료전지스택의 고장을 운전자에게 알리고 연료전지스택의 발전을 멈추게 한다. 기존에 SVM 제어기는 각 셀마다 분압저항을 통하여 측정하며 이 전압의 차를 이용하여 셀 전압을 계산하는 방식이었다. 이는 상위 셀로 갈수록 오차가 커지는 문제가 있고 다수의 CPU 및 DC/DC 컨버터가 적용이 필요하여 복잡한 구성과 가격이 높은 문제가 있었다. 이러한 문제점을 해결하기 위하여 cell monitoring IC를 적용하였고 좀 더 정밀한 측정과 간단한 인터페이스를 구성할 수 있었다. 본 연구에서는 기존 SVM 제어기보다 안정되고 정밀한 SVM 제어기의 개발에 대해 기술하였다.
실시간 임베디드 시스템을 위한 딥러닝 기반 객체 검출기와 추적기 통합
정재욱(Jaewook Jung),서재규(Jae Kyu Suhr) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
Computer vision-based multiple object tracking (MOT) is an essential technology in many applications, such as autonomous driving and visual surveillance. In MOT, with the recent advancements in Deep Neural Networks, a tracking-by-1detection approach has been widely utilized. This approach consists of two stages: 1) the detection stage that independently detects objects in each frame, and 2) the reidentification stage that associates tracked objects with correctly detected objects. Most methods using this tracking-by-detection approach use two separate networks: one for detection and the other for reidentification. These methods have limitations when used in real-time embedded systems in terms of computational resources. Therefore, to overcome this limitation, this paper proposes a method that integrates the detection and reidentification into a single network. The proposed method uses fewer computational resources while showing a similar performance as the approach using two separate networks.