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박영철(Youngchul Park),이동화(Donghwa Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Requirement terms in the development of automobile part are progressed about light weight, damage prevention by fatigue, and safety of product. Already, The previous study was gained suitably the good result about light weight in the expected period of this time when they changed the metal of lower control arm. But in the case of automobile part, it was concerned with life of people. And in the result, the fatigue life is very important. In this requirement, when we drive a car, our car is applied to the cycle load. Estimation of the fatigue properties must have respect to the design process. In these days of rapidly growth. this study is help to competition ability of automobile industry and will bring forth a large safety property and fast development effect.
박영철(Park Youngchul) 계명대학교 사회과학연구소 2004 한국사회과학연구 Vol.23 No.1
If we forcast the demand for the traffic of the subway system in Daegu, we can efficiently manage the manpower and the facilities of the city. The forcasting is implemented through autoregressive-moving average process and Winters' additive seasonal exponential smoothing. If it had not been for the arson in the subway in 1993, the daily transportation would slightly have increased. The demand for the subway system is high in spring and in fall, and low in summer and in winter.
효율적인 압축 알고리즘을 이용한 실용화 수준의 DVR 시스템
박영철(Youngchul Park),안재기(Jaeki Ahn) 한국정보과학회 2004 정보과학회 컴퓨팅의 실제 논문지 Vol.10 No.3
본 논문은 실용화 레벨에서의 디지털 영상기록 (Digital Video Recording: DVR) 구현을 기술한다. 또한 입력 영상을 배경과 목표물 영역의 두 가지 영역으로 분리 처리하여 분리된 영역별로 중요도를 고려하여 서로 다른 압축 기법을 적용함으로써 효율적인 압축부호화를 수행할 수 있는 방안을 제안한다. 본 알고리즘은 영상 압축 부호화 기법으로서 영역분할을 통해 Macro block 단위로 물체 영역과 배경 영역을 재구성해서 부호화에 이용하는 방식이다. 제안된 알고리즘은 매우 효율적인 압축 성능을 보여주며, 저 전송률 상황에서도 높은 질의 영상을 복원할 수 있다. We describe a practical implementation of DVR (Digital Video Recording) system. And we propose a new image compression algorithm, that input video signal is divided into two parts, a moving target and a non-moving background part to achieve efficient compression of image sequences. This algorithm reorganizes a target area and a back-ground area by use of Macro Block(MB) unit on encoding scheme. The proposed algorithm allows high quality image reconstruction at low bit rates.
박성현(Seonghyeon Park),강홍재(Hongjae Kang),이경환(Kyounghwan Lee),박영철(Youngchul Park),이종광(Jongkwang Lee) 대한기계학회 2021 大韓機械學會論文集B Vol.45 No.7
액적낙하 실험은 간단한 실험 방식을 기반으로 점화 가능성이나 점화 성능을 평가할 수 있는 실험이다. 기존의 액적낙하 실험은 주로 초고속 카메라를 이용하여 점화지연시간을 측정하였다. 이 논문에서는 기존 측정 기법의 한계점을 극복하고 점화지연시간을 정량적으로 계측할 수 있는 액적낙하 실험 기법을 제안하였다. 반응성 연료와 과산화수소를 접촉점화 추진제로 사용하였으며, 광 및 음향 센서를 적용하여 점화지연시간 측정 신뢰도를 높였다. 또한, 액적낙하 높이, 산화제 농도, 산화제와 연료의 질량비를 실험 변수로 설정하여 다양한 연료를 평가하기에 적합한 실험 조건을 확립하였다. A drop test was implemented to evaluate ignitability and ignition performance. In the present study, a new measurement method for the drop test is proposed. A drop test setup comprised optic and acoustic sensors that were employed to enhance the reliability to overcome the technical limitations present in the conventional measurement method using a high-speed camera. drop tests were conducted using hydrogen peroxide and reactive fuel. Additionally, the experimental conditions for evaluating various fuels were established by controlling variables such as the droplet height, oxidizer concentration, and O/F mass ratio.
박한석(Hanseok Park),박영철(Youngchul Park),이권희(Kwonhee Lee),김영준(Youngjun Kim),김종규(Jongkyu Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Recently developed automotive components are getting lighter providing a higher fuel efficiency and performance. Following the current trend, this study proposes a structural optimization method for the lower control arm installed at the front side of a Vehicle. Lightweight design of lower control arm can be achieved through design and material technology. In this research, the shape of lower control arm was determined by applying the optimization technology and aluminum was selected as a steel-substitute material. Strength performance is the most important design requirement in the structural design of a control arm. This study considers the static strength in the optimization process. For the optimum design, the durability analysis is performed to predict its fatigue life. In this study, the kriging interpolation method is adopted to obtain the minimum weight satisfying the strength constraint. Optimum designs are obtained by the in-house program, EXCEL-Kriging. Also, based on the optimum model obtained for the static strength, the optimization of Index of Fatigue Durability is carried out to get th optimum fatigue performance.