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양지웅(YANG, Jiwoong),김진태(KIM, Jin-Tae),김주영(KIM, Jooyoung) 대한교통학회 2018 대한교통학회지 Vol.- No.-
국제사회는 3개 렌즈(적, 황, 녹) 교통신호등 사용을 표준으로 규정으로 하나, 우리나라는 4개(적, 황, 녹색화살표, 녹색) 렌즈 교통신호등의 사용을 일반적으로 허용한다. 본 연구는 국제연합 규정 3색 신호등 사용 운전자들의 인지반응 시간과 우리나라 규정 4색 신호등 사용 운전자들의 인지반응 시간이 같지 않음을 확인한다. 피(被)실험 운전자 40명으로부터 총 1,920개 인지반응 시간자료 및 뇌파 자료를 실내시험으로 수집하고 분석하였다. 분석결과 3색 신호등이 4색 신호등보다 신뢰수준 95%에서 (1) 해석 오류가 없고, (2) 인지반응 시간이 빠르며, (3) 인지반응 시간의 표준편차도 적은 것으로 도출되었다. 뇌파 자료 분석결과 3색 신호등은 비서술적 기억 영역(전두엽; 반응 빠름)이 활성화되고, 4색 신호등은 서술적 기억 영역(측두엽; 반응 상대적으로 느림)이 활성화됨을 확인하였다. 이로 우리나라 교통신호등이 교통안전에 유리한 방향으로 발전할 필요가 있음을 제언한다. This study analyzes drivers’ reaction times from the different ways to deliver the meaning of traffic signals based on previous research in Psychology that descriptive and non-descriptive memories in human’s cerebellums play in different roles. The meaning of traffic signal lights is delivered by either the color of light or the combination of those colors. Total 40 subjects asked to react various images of traffic signals and their 1,920 reaction time data were collected and analyzed. Results showed that three-head traffic signals delivering the meaning of traffic signals with its colors provide with less and stable reaction times, at 95% confidence level, compared to the ones of four-head traffic signals delivering with the combination of those. This study suggest a direction to change the types of traffic signal lights based on the findings from this study.
정적연소기에서 분위기 압력에 따른 Diesel-DME 혼합연료의 분무 특성에 관한 연구
양지웅(Jiwoong Yang),이세준(Sejun Lee),임옥택(Ocktaeck Lim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The aim of this study was compared the spray characteristics of a typical fuel(100% Diesel,DME) and Diesel-DME blended fuel in Constant Volume Combustion Chamber(CVCC). typical fuel(100% Diesel,DME) and Diesel-DME blended fuel spray characteristics were investigated about varied ambient pressure and fuel injection pressure using the common rail fuel injection system when the fuel mixture ratio is varied. The fuel injection quantity and spray characteristics were measured. the spray characteristic research parameters were spray shape, penetration length, and spray angle at seven nozzle hole injector. common types of injectors were used(bosch). Three types of blended fuel by the mole fraction was used. The typical fuel(100% Diesel,DME) and The blended fuel by mixture ratio 95:5, 90:10 (Diesel,DME) were used. The ambient pressure was varied by 5MPa from 35 to 70MPa when the ambient Pressure was varied 0,2.5 and 5MPa. The result of using Diesel-DME blended fuel. It can be confirmed from the experiment on spray characteristics of Diesel-DME blended fuels that the increased Diessel blending ratio induced the increase of the spray penetration length. The spray angle slightly increased by the blending of DME fuel. In the experiment on atomization characteristics, the DME blending caused the improvement of the diesel atomization performance.
Diesel-DME 혼합연료의 정적챔버내에서의 분무 및 단기통엔진내에서의 연소, 배기특성에 관한 연구
양지웅(jiwoong Yang),정재훈(jahoon Jung),윤상진(sangjin Yoon),임옥택(ocktaeck Lim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The purpose of this study was compared the spray characteristics, combustion characteristics and emissions(NOx, CO, HC, smoke) of a typical fuel(100% Diesel,DME) and Diesel-DME blended fuel in a Constant Volume Chamber(CVC) and a single-cylinder DI diesel engine. Spray characteristics were investigated about varied ambient pressure and fuel injection pressure using the common rail fuel injection system when the fuel mixture ratio is varied. the spray characteristic research parameters were spray shape, penetration length, and spray angle at seven hole injector. common types of injectors were used(Bosch). Two types of blended fuel by the mass fraction was used. The typical fuel(100% Diesel,DME) and The blended fuel by mixture ratio 95:5, 90:10 (Diesel:DME) were used. The Injection pressure was fixed by 70MPa when the ambient Pressure was varied 0,2.5 and 5MPa. The combustion experiments was conducted in single cylinder engine equipped with common rail. injection pressure is 700 bar at 1200 rpm. The amount of injected fuels is adjusted to obtain the fixed input calorie value as 972.2 J/cycle in order to compare with the fuel conditions.
In-situ Liquid Phase TEM for Studying Crystallization of Colloidal Nanocrystals
Jiwoong Yang(양지웅) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Recent development of in-situ liquid-phase transmission electron microscopy (TEM) has enabled us to study nanoscale dynamic processes. In this talk, I will present my research on studying formation of colloidal nanocrystals using in-situ liquid-phase TEM. First, I will talk about nonclassical crystallization phenomena of colloidal nanocrystals. Second, I will discuss the importance of development advanced liquid cells to study formation of colloidal nanocrystals.