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중심전극에서 연료를 분사하는 스파크플러그에 의한 예혼합기의 연소특성
박우영(Wooyoung Park),이명준(Myungjun Lee),염정국(Jeongkuk Yeom),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
This study proposes a new stratified charge system for low emission and over lean burn. Combustible mixture was induced around sparkplug using a spherical piston cavity and up-right straight port in the genernl method of strntified charge. In this study, method of new stratified charge is to use Injector-sparkplug. This system inject fuel of extremely small quantities and ignite mixture around sparkplug gap. Injector-sparkplug was fitted in the visualized constant volume chamber. The combustion characteristics was compared with conventional ignition method and this method. We examined combustion pressure and lean misfiring limit, visualized combustion flame according to equivalence ratio. As results of this study, in case of using Injector-sparkplug, initial flame propagation speed was increased and total combustion period was reduced in the over lean bum the same equivalence ratio. These phenomena present more remarkable under conditions of lean equivalence ratio and lean misfiring limit was extended.
생활체육 참여 장애인들의 운동몰입, 운동만족, 사회성의 관계: 자기결정성이론의 적용
박우영 ( Wooyoung Park ),고대선 ( Daesun Ko ) 한국특수체육학회 2021 한국특수체육학회지 Vol.29 No.4
본 연구의 목적은 생활체육에 참여하는 지체장애인들에게 자기결정성이론을 적용하여 운동몰입, 운동 만족, 사회성의 관계를 살펴보는 것이다. 연구의 대상자는 경기지역 장애인 체육시설에서 생활체육 종목에 참여하고 있는 지체장애인을 모집단으로 선정하여 291부를 분석하였다. 연구방법은 빈도분석, 신뢰도 분석, 상관관계 분석, 구조방정식모형을 이용하였다. 이와 같은 연구방법을 통해 다음과 같은 결과를 도출하였다. 첫째, 자기결정성 중 자율성, 관계성은 운동몰입에 영향을 주는 요인으로 나타났다. 둘째, 자기결정성 중 자율성, 관계성은 운동만족에 영향을 주는 요인으로 나타났다. 셋째, 자기결정성 중 자율성, 관계성은 사회성에 영향을 주는 요인으로 나타났다. 넷째, 운동몰입은 운동만족에 영향을 주는 요인으로 나타났다. 따라서 생활체육에 참여하는 지체장애인들의 스포츠활동 참여를 위해 자율성과 관계성을 강화 시켜줄 수 있는 방안 마련에 힘써야 할 것으로 판단된다. The purpose of this study was to examine the relationship between exercise commitment, exercise satisfaction, self-determination, and sociality by applying the self-determination theory to participation in sport for all for the disabled. The subjects of this study were people with physical disabilities participating in daily sports at the sports facilities for the disabled in Gyeonggi province as the population, and 291 copies out of a total of 320 copies were analyzed. The research methods used frequency analysis, reliability analysis, correlation analysis, and structural equation model. The results as follows: First, among self-determination, autonomy and relationship were found to be factors affecting exercise commitment. Second, among self-determination, autonomy and relationship were found to be factors that affect exercise satisfaction. Third, among self-determination, autonomy and relationship were found to be factors affecting sociality. Fourth, exercise commitment was found to be a factor influencing exercise satisfaction. Therefore, it is judged that efforts should be made to devise measures to reinforce autonomy and relationships for the physically disabled to participate in sport activities.
박우영(Wooyoung Park),문주혁(Juhyuk Moon) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구는 X선 형광 분석법(XRF)와 내부표준물질 혼합법을 적용한 Rietveld 방법을 사용하여 계산한 국내산 플라이애시 화학 조성(wt%)과 비정질 함량(wt%)을 머신러닝 학습 데이터로 사용하였다. 오픈 소스 라이브러리인 Keras를 사용한 인공 신경망을 구축하여 플라이애시의 화학 조성을 통해 비정질 함량을 예측하였다. 모델의 정확도는 학습 데이터의 결정계수 0.884, 시험 데이터의 결정계수 0.771로 신뢰성 있는 예측임을 나타냈다. In this study, domestic fly ashes‘ chemical compositions(wt%) and amorphous contents(wt%) calculated by X-ray fluorescence analysis and Rietveld method, respectively, were used as machine learning data. Artificial neural network using Keras, an open source library, was constructed to predict the amorphous content through the chemical composition of fly ash. The accuracy of the model indicates that prediction is reliable. A coefficient of determination of train dataset is 0.884 and a coefficient of determination of test dataset is 0.771.
EGR cooler를 적용한 HSDI 디젤엔진에서의 배기 특성에 관한 연구
박우영(Wooyoung Park),최성우(Sungwoo Choi),정성식(Sungsik Chung),하종률(Jongyul Ha) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The use of Exhaust Gas Recirculation (EGR) system has become a popular way fo reducing NOx levels in internal combustion engine.<br/> However, the application of EGR is also having a problems which we have to solve. I pal1icular, EGR system has relation the trade-off between NOx and Soot emissions, especially at high loads.<br/> Reducing NOx and Soot emissions from diesel engine, and improving fuel consumptio simultaneously are important in meeting government regulations and society's needs.<br/> In this study, the effects of Cooled EGR on the characteristics of NOx and Soot have bee investigated using HSDI(High Speed Direct Injection) diesel engine operating at various loads and speeds.<br/>
박우영 ( Wooyoung Park ) 한국환경경제학회 한국자원경제학회 2017 자원·환경경제연구 Vol.26 No.2
본 연구는 국제원자력기구(International Atomic Energy Agency: IAEA)의 원자로정보시스템(Power Reactor Information System: PRIS)에서 제공하는 원자로 운전실적지표를 이용하여 원전의 안전성에 미치는 기술적·비기술적 요인의 역할을 분석한다. 이를 위해 안전성의 척도로 원전의 고장정지에 따른 발전손실률 (FLR: forced loss rate)을 사용했다. 1970년부터 2015년까지 전 세계에서 운영된 모든 원전으로 구성된 패널자료를 통해 분석한 결과, 기존 연구와 마찬가지로 원전의 전반적인 기술수준과 정비기술수준이 향상될수록 FLR이 하락하는 사실을 확인했다. 하지만 1986년 체르노빌 원전 사고 이후 기술적 요인이 통제된 FLR은 유의적으로 상승했다. 이는 원자력발전사업자가 체르노빌 사고 이후 원자력안전을 위해 보다 많은 기회비용을 지불하고 있다고 해석된다. Nuclear safety measures such as safety technology, culture, and regulation affects nuclear performances. This paper analyzes the change of nuclear performance by considering nuclear safety measures. Nuclear performance and technical data ranging 1970 to 2015 are collected from the Power Reactor Information System (PRIS) of IAEA. The result of panel regression analysis shows that overall engineering level, maintenance engineering and productivity decrease the forced loss rate (FLR). FLR structurally increase after Chernobyl accident in 1986 whereas after TMI and Fukushima accidents FLR didn`t show any significant changes. The structural increase of FLR after Chernobyl are likely to result from the efforts of international communities for nuclear safety culture which makes nuclear operating company pay more opportunity cost to achieve nuclear safety.
미소영역 성층혼합기 유도를 위한 스파크플러그에 관한 연구
박우영(Wooyoung Park),이명준(Myungjun Lee),염정국(Jeongkuk Yeom),하종률(Jongyul Ha),정성식(Sungsik Chung) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
This study proposes a new stratifide charge system for low emission and over lean bum. Combustible mixture was induced around sparkplug using a spherical piston cavity and up-right straight potr in the general method of stratified charge. In this study, a method of new stratified charge is to use injector-sparkplug. This system injects fuel of extremely small quantities and ignite mixture around sparkplug gap. Injector-sparkplug was fitted in the visualized constant volume chamber. The combustion characteristics was compared with conventional ignition method and this method. We examined combustion pressure and lean misfiring limit, visualized combustion flame according to equivalence ratio.<br/> As results of this study, in case of using injector-sparkplug, initial flame propagation speed was increased and total combustion period was reduced in the over lean bum in the same equivalence ratio. These phenomena occurred clearly under the conditions of lean equivalence ratio. Furthrmore, the lean misfiring limit of mixture was estended by using the injector-sparkplug.