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김규진(Gyujin Kim),민경덕(Kyoungdoug Min) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
A two dimensional flamelet model, which uses two mixture fraction variables, was introduced to represent the non-premixed combustion of multiple injections. However, the model’s computational time drastically increased due to the expansion of the solution domain. Thus, a modified 2-D flamelet model was introduced to reduce the computational time of the two dimensional flamelet model. The objective of this study is to extend the modified 2-D flamelet model to three or more injection strategies without increasing the computational costs. A few multiple injection strategies (pilot-pilot-main/pilot-pilot-main-post) were applied to a multi-cylinder engine. Two operating conditions (1500/4, 1500/6, [rpm/bar]) were tested, and the simulation results of the pressure using the modified 2-D flamelet model were compared with the experimental data. Lastly, the combustion and emission characteristics of each injection strategy were determined, and the model demonstrated a good agreement with the experimental results.
확산과 예혼합 연소의 결합을 통한 혼소 연소 및 배기 배출물에 관한 모델링
김규진(Gyujin Kim),이상열(Sangyul Lee),고인석(Insuk Ko),민경덕(Kyoungdoug Min) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Dual-fuel combustion is a kind of concept which uses different type of fuels in a single engine cycle. By adding low reactivity fuel long before the injection of liquid fuel, we can use both advantages of each conventional combustion. However, the numerical approach to the dual-fuel combustion needs a huge amount of computational costs because there is no dual-fuel combustion models so they solve the chemical kinetics directly. So in this study, a unified model which combine diffusion flame model and premixed flame model was developed and applied to the practical 3-D engine mesh. It shows good agreement with experimental data and predicted levels of NOx, PM emissions showed reasonable agreement to the experimental data. Effect of injection timing and EGR rate in dual-fuel combustion are also investigated.
무용콩쿠르 참가동기가 전공몰입에 미치는 영향 : 자기효능감의 매개효과
김규진 ( Gyujin Kim ) 대한무용학회 2020 대한무용학회논문집 Vol.78 No.6
This research has investigated the impact of a motive to participate in a dance Concours on major concentration, and self-efficacy in order to provide basic material to change the social attitude on a dance Concours, which assumes that it is merely a competition. a survey was implemented for 186 undergraduate and graduate students who have experiences of participating in a dance Concours, and it was verified through t-test, Anova, mediating effect, multiple regression analysis. In a result, an element of a motive to participate in a dance Concours, influences major satisfaction in a significant way whilst skill acquisition and self-realisation in major concentration and the increase of exchange in self-efficacy. Self-efficacy had a partial mediating effect on the relationship between dance Concours and major concentration. Based on such a result, implications, including the reenforcement of support of a university and department for a dance Concours, cultivation of the system of positive attitude towards a dance Concours are derived.
디젤 모사 연료의 성분이 점화 지연 시간에 미치는 물리적 영향에 대한 연구
김규진(Gyujin Kim),이상열(Sangyul Lee),박원아(Wonah Park),김주한(Joohan Kim),민경덕(Kyoungdoug Min) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Due to its advantages and efficiency, reduced kinetic mechanism of diesel surrogate is widely used as fuel model when doing 3-D diesel engine simulation. But for the well-developed prediction of diesel surrogate reduced kinetic mechanism, it is important to know some meaningful factors which are affecting to ignition delay time. Meanwhile, Ignition delay time consists of two parts. One is the chemical ignition delay time related with the chemical reaction, and the other is the physical ignition delay time which is affected by physical behavior of the fuel droplet. Chemical properties of each fuel were studied for a long time, but researches on their physical things are not widely done. So it is necessary to understand the physical characteristics of each fuel component that forms the diesel surrogate fuel.
발목의 해부학적 회전구조를 구현하고 제어하는 발목재활로봇
김인우(Inwoo Kim),김규진(Gyujin Kim),권경민,장재용(Jeung Jang),임서균(Yim Seo Gyun),조대기(Daeki Cho),이수홍(Soo-Hong Lee),Gapsun Kim 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
When physical ability is reduced due to aging and various diseases, the athletic ability of the ankle, which plays a very important role in walking, is significantly weakened. Various ankle exoskeleton robots have been developed to assist and rehabilitate ankles with reduced mobility, but most do not implement the correct rotation axis of the ankle, making it difficult to transmit the correct force and increase the risk of injury. In this study, the anatomical axis of rotation of the ankle joint was structurally implemented. Two linear actuators were installed in the embodied structure to control the two rotation axes of the robot. By installing a load cell between the linear actuator and the structure, the magnitude of the torque transmitted by the robot to the human can be calculated inverse dynamic. The ankle exoskeleton robot can effectively simulate and support all movements of the human ankle.