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구면 수차를 이용한 비구면 렌즈의 설계와 수차 측정 장치 개발
박규열(Kyuyeol Park),김한섭(Hanseob Kim) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.6
In this paper, an aberration free aspherical lens is designed and machined by new design method and the spherical aberration measuring system is developed. It confirmed the propriety of new design method by measuring optical characteristics of machined lens with the new measuring system. The system could measure a spherical aberration quantitatively by using CCD camera, laser, collimator and so on.
KSAE 대학생 자작자동차 대회용 차량의 설계방안 사례
박도영(Doyoung Park),김민성(Minseong Kim),김균언(Gyuneon Kim),장우형(Woohyeong Jang),이병우(Byeoungu Lee),문원진(Wonjin Moon),김경환(Kyeonghwan Kim),박경민(Kyungmin Park),강민우(Minwo Kang),강병관(Byeongkwan Kang),박규열(Kyuyeol Park 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In this paper, a designing case of the Formula-style vehicle for KSAE student Formula competition is introduced. The 250cc engine vehicle is built for the competition and the designing process is composed of five modules. During the designing project, the fundamental performance of the modules was evaluated using FEM. For example, the frame design was focused on weight reduction and it was built by CATIA V5, and FEM method was used to analyze the designed frame on static and dynamic characteristics. In case of optimized the cowl shape, FLUENT was used to get the drag and lift coefficient from the cowl shape. In detail, to optimize the cowl shape, aerodynamic modeling was carried out and the final shape was determined. As a result, the 250cc engine vehicle for KSAE student Formula competition was built and the fundamental performance was investigated.
물리보다 수학을 잘 해야 물리를 잘 한다: 입학 전 수학진단점수의 일반물리학 성취도 예측타당성 검증
신윤경(Shin, Yunkyoung),박규열(Park, Kyuyeol),이아름(Lee, Ah-reum),정종원(Jung, Jongwon) 한국공학교육학회 2019 공학교육연구 Vol.22 No.4
This study aims to elucidate the relationship between physics and mathematics to predict achievement for the college level of engineering courses. For the last 4 years, more than 3,000 engineering college freshmen of this study took the diagnostic tests on three subjects, which were physics, mathematics, and chemistry before enrollment. We studied how strongly these diagnostic scores can predict each general college course grades. The correlation between the physics diagnostic scores and the course grades in physics was .264, which was significantly lower than the correlation between the mathematics scores and the physics grades, .311. This stronger prediction of the mathematical diagnostic scores for the general course grades was not found when predicting the grades in chemistry. We therefore conclude that mathematical preparation can unexpectedly predict future achievement in physics better than physics preparation due to the academic interrelationships between mathematics and physics.
DME/n-Butane 혼합 연료의 농도 성층화에 의한 HCCI엔진연소의 압력 상승률 저감에 관한 연구
임옥택(Ocktaeck Lim),박규열(Kyuyeol Park) 한국가스학회 2011 한국가스학회지 Vol.15 No.3
본 연구에서는 DME와 n-Butane 연료를 사용하여 혼합연료 및 성층화효과가 HCCI 연소 특성에 미치는 영향을 화학반응수치계산을 통해서 알아보고자 한다. 우선, 기존에 완성된 DME와 n-Butane 반응스킴을 이용하여 새로운 화학 반응 모델을 만들고 기존의 DME 화학 반응 모델과 n-Butane 화학 반응 모델과 비교하여 유효성을 확보한다. 나아가, 자발화 특성이 다른 DME와 n-Butane 두 연료의 혼합비 변화에 따른 HCCI 연소 특성을 파악한다. 마지막으로, 혼합 연료를 각각 성층급기 했을 경우에 압력상승률 저감 효과를 파악 한다. This study investigates the effects of the DME and n-Butane mixture and of the stratification on combustion characteristics of HCCI engine by chemical reaction calculation. First, the existing DME reaction scheme and n-Butane is combined to make new chemical reaction model, then validating the effectiveness of new scheme. Furthermore, this study verify the HCCI combustion characteristics according to the changes of DME and n-Butane mixture ratio, which shows different auto ignition characteristics. Finally, it confirms the effects of stratification of mixture fuel on the reduction of pressure rise rate.
구면 수차를 이용한 비구면 렌즈의 설계와 수차 측정 장치 개발
김한섭(Hanseob Kim),박규열(Kyuyeol Park) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
In this paper, an aberration free aspherical lens is designed and machined by new design method and the spherical aberration measuring system is developed. It confirmed the propriety of new design method by measuring optical characteristics of machined lens with the new measuring system. The system could measure a spherical aberration quantitatively by using CCD camera, laser, collimator and so on.
김한섭(Hanseob Kim),박규열(Kyuyeol Park) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
In this paper, spherical aberration and light concentrating efficiency of lens was measured. The measuring system is applying spherical aberration occurrence principal and could measure a temperature at focal plane by using the thermocouple. The sun which is located in infinite distance and could makes parallel ray is used as a i1luminant or heat source in experiments. It is confirmed that light concentrating efficiency of optical lens is in inverse proportion to spherical aberration and.
김한섭(Hanseob Kim),박규열(Kyuyeol Park) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
In this paper, spherical aberration and light concentrating efficiency of lens was measured. The measuring system is applying spherical aberration occurrence principal and could measure a temperature at focal plane by using the thermocouple. The sun which is located in infinite distance and could makes parallel ray is used as a i1luminant or heat source in experiments. It is confirmed that light concentrating efficiency of optical lens is in inverse proportion to spherical aberration and.
DME/Diesel 듀얼 퓨얼 엔진의 연소 및 배출특성에 관한 연구
임옥택(Ocktaeck Lim),박규열(Kyuyeol Park),표영덕(Youngduck Pyo),이영재(Youngjae Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Nowadays we are more concerned about emissions that are harmful in our environment, so at once an increasing of importance to think about clean diesel. One of the alternative technologies covers in this study that is preceded by dual-fuel combustion which is controlling combustion by using two fuels with different auto-ignition values. For dual-fuel combustion, here used two fuels such as DME and diesel. Both of them have different characteristics of evaporation and auto-Ignition. In the current work, we focus on understanding the characteristic of combustion and emissions under single cylinder engine and ignition is done by compression ignition. Pre-mixture is formed by injecting low-pressure DME into an intake manifold and high-pressure fuel (diesel or DME) is injected directly into the cylinder. Both direct diesel injection and port fuel injection reduced the significant amount of Soot, CO and NOx in the homogeneous charge compression ignition engine due to present of oxygen in DME as well having diesel engine like thermal efficiency. In addition, when direct DME injecting in cylinder with port DME injection, there is no changes in emissions and energy consumption rate even causing homogeneous charge compression ignition.
김한섭(Hanseob Kim),박규열(Kyuyeol Park) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.5
In this paper, spherical aberration and light concentrating efficiency of lens was measured. The measuring system is applying spherical aberration occurrence principal and could measure a temperature at focal plane by using the thermocouple. The sun which is located in infinite distance and could makes parallel ray is used as a illuminant or heat source in experiments. It is confirmed that light concentrating efficiency of optical lens is in inverse proportion to spherical aberration and.