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원형 실린더 주위의 유동해석을 통한 URANS 난류 모델 성능 비교
김민재,신지환,권래언,이건철,Kim, Minjae,Shin, Jihwan,Kwon, Laeun,Lee, Kurnchul 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.6
In the present study, the flow around a circular cylinder at $Re=3.6{\time}10^6$ is numerically simulated using URANS approach. The objective of this study is to evaluate the turbulence models(Realizable k-${\varepsilon}$, RNG k-${\varepsilon}$) through the prediction of the unsteady flow characteristics around the cylinder. The time-averaged drag coefficients and vortex shedding phenomenon in the wake region are compared to available experimental data and other numerical results. The simulation with Realizable k-${\varepsilon}$ model is found to be more dissipative due to large eddy viscosity predicted in the wake region while the simulation with RNG k-${\varepsilon}$ model predicts a complex vortex shedding phenomenon with more coherent structures realistically.
SILS 시스템 기반 직렬형 하이브리드 버스에 대한 연구
김민재(Minjae Kim),정대봉(Daebong Jeong),민경덕(Kyoungdoug Min) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Model based development which does not consider the real time characteristics usually have an interest on the model functional aspects. So, it considers the control algorithm to be performed simultaneously, or it ignores the time which is consumed when the controller operates. However, in the real model just one task can be performed in the MYCOM. Therefore the lack of time which comes from the sharing time makes some differences between the simulation and the real model. Therefore the compensation with time and money is inevitable. To solve those problems the research about sham simulation environment research was performed. In this research, it presents the Series Type Hybrid Bus Research of SILS System. In the research environment, the controller design and realization is performed at the same platform. Therefore the model reuse of controller design is connected to the reuse of the code and from the verified controller very high reliability real time series HEV BUS design and materialization could be availablee. For all this construction and performance at first hardware SILS was constructed and HOST PC to RTPC linkage was performed. HOST PC controls the total system and RTPC makes the calculation result in itself. Basically the operation environment of HOST PC and RTPC was ETAS LABCAR Operator.
전통 서당수업의 교수ㆍ학습방법을 활용한 중학교 ‘도덕과(道德科)’ 수업
김민재(Minjae Kim) 성신여자대학교 교육문제연구소 2013 교육연구 Vol.57 No.-
본 연구의 목적은 ‘강(講)’과 ‘놀이’라는 전통 서당수업의 대표적인 교수ㆍ학습방법들을 살펴보고, 그것을 중학교 ‘도덕과(道德科)’ 수업에서 적극 활용해보고자 하는 것이다. 특히 전통 서당수업의 핵심 교수ㆍ학습방법인 강과 현대 도덕수업에서 중요하게 다루는 ‘가치ㆍ덕목교육’, ‘정서함양교육’, ‘수행평가’ 등을 접목시켜 논의를 진행하였다. 이 과정을 통해 첫째, 가치ㆍ덕목의 내면화와 비판적 관점 기르기, 둘째, 도덕적 정서에 대한 성찰과 발산, 셋째, 도덕시험 점수와 실제적인 도덕성 사이의 간극 줄이기 등에 대해 전통 서당수업의 강이 일정 이상의 기여를 할 수 있다는 점을 밝히고자 하였다. 또한 우리 전통에서 발견되는 교수ㆍ학습방법들이 단지 문헌 속에만 남아있는 ‘생명력이 다한’ 것이 아니라는 점도 밝히고자 하였다. The purpose of this study is to examine the representative teachingㆍlearning method of the traditional village school class called ‘recitation’ and ‘play’, and to make use them in the ‘moral’ class of middle school actively. Especially, it arranged discussion by integrating recitation, the core teachingㆍlearning method of the traditional village school class with ‘valueㆍvirtue education’, ‘emotional cultivation education’, and ‘performance assesment’ which are regarded as the important themes in today moral education. It tried to clarify that recitation of the traditional village school class can make valuable contributions to first, internalization of valueㆍvirtue and cultivation of critical viewpoints, second, introspection and exuding about moral emotions, and third, reducing the gap between moral test scores and practical morality through this process. And it tried to clarify that life of the teachingㆍlearning methods which are found in our tradition and that you can just find them in literature did not end.
수분 저항성 개질 제올라이트의 실내환경 저농도 CO₂ 흡착 연구
김민재(Minjae Kim),김성곤(Seonggon Kim),이재원(Jae Won Lee),강용태(Yong Tae Kang) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Hydrophobic coated zeolite 13X with octadecyltrimethoxysilane (ODTMS) has a property of humidity resistance and a higher CO₂ adsorption capacity in indoor condition compared to untreated zeolite 13X. Zeolite is adaptable for indoor CO₂ capture because of its durability, non-toxicity and high accessibility in terms of price. Hydrophobic coating changes the characteristics of surface and adsorption tendency of CO₂ and H₂O, and these changes make difference in selectivity of zeolite. In this study, the zeolite+20 wt%ODTMS was confirmed as an optimal loading of hydrophobic coating. The performances of CO₂ and moisture adsorption were investigated by BET-CO₂ and DVS analysis, and it was found that adsorption capacity of zeolite+20wt%ODTMS decreased by 0.03 g<SUB>CO2</SUB>/g<SUB>adsorbent</SUB> (from 0.18 to 0.15 g<SUB>CO₂</SUB>/g<SUB>adsorbent</SUB>), and 0.04 g<SUB>H2O</SUB>/g<SUB>adsorbent</SUB> (from 0.10 to 0.06 g<SUB>H₂O</SUB>/g<SUB>adsorbent</SUB>). Enhanced moisture resistance improves the selectivity of CO₂ in ambient air condition, and this is tested in indoor condition chamber. It was finally found that the CO₂ capture performance increased by 45% and moisture adsorption capacity decreased by 40% ; this modification proposes wider perspective on adsorbents to utilize in CO₂ capture in indoor condition.