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대학생 인터넷윤리 의식 함양에 대한 온라인 플립러닝의 학습 효과 비교
김우태(Wootae Kim) 한국컴퓨터교육학회 2021 컴퓨터교육학회 논문지 Vol.24 No.1
본 연구는 언택트 시대에 효과적인 비대면 수업을 위한 온라인 플립러닝 구현 및 대학생 인터넷윤리 교육의 온라인 플립러닝의 학습 효과를 확인하는 것이 목적이다. 기존 플립러닝의 교실에서의 학습활동을 ZOOM 실시간 쌍방향 화상회의 시스템을 활용하여 비대면 수업방식으로 구현하였다. 온라인 플립러닝(A 그룹)이 전통적 교수법을 활용한 수업(B 그룹)보다 인터넷윤리의 4가지 도덕원리인 존중의식, 책임의식, 해악금지 영역의 인터넷윤리 의식이 효과적인 것으로 나타났으나, 정의추구 영역은 통계적으로 유의한 학습효과가 없었다. 본 연구를 바탕으로 온라인 플립러닝 모델 구축을 위해 수업설계, 운영, 평가 방안에 대한 효과성 검증을 위한 후속 질적 연구를 제언한다. The purpose of this study is to implement online flip-learning for effective non-face-to-face classes in the untact era and to verify the learning effects of online flip-learning in college students" Internet ethics courses. The existing flip-learning classroom learning activities were implemented as a non-face-to-face teaching method using the ZOOM real-time interactive video conferencing system. Online flip-learning (Group A) showed more effective Internet ethics consciousness in the areas of respect, responsibility, and harmlessness, which are four moral principles of Internet ethics, rather than classes using traditional teaching methods (Group B). Had no statistically significant learning effect. Based on this study, a follow-up qualitative study is suggested to verify the effectiveness of instructional design, operation, and evaluation methods to build an online flip learning model.
엔진 초기 개발 단계에서의 Water Jacket 형상 최적화에 관한 연구
김영남(YoungNam Kim),한봉훈(BongHoon Han),김우태(WooTae Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The flow patterns in the water jacket passage were scrutinized using computational fluid dynamics method. Using the flow patterns in the water jacket passage and the sectional distributions of mass flow rate and Head pressure resistance, the geometric optimization has been performed for the water jacket passage. Geometric influences on the flow patterns in water jacket were easily investigated. With the optimization of water jacket passage, the uniform mass flows in the cooling water passage between exhaust ports which is crucial for the engine head cooling system were obtained. It was possible for the geometric optimization of the cooling system in the early stage of engine design.<br/>
김원규(Wongyu Kim),부성협(Sunghyup Boo),오대윤(Daeyoon Oh),김우태(Wootae Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
In multi-cylinder reciprocating engine, piston movement makes fluctuation of crankcase pressure, and the fluctuation is converted to pumping loss which is part of cngine friction. The excessive fluctuating pressure makes increase of engine friction, and causes decrease of power, low fuel efficiency and increase of engine oil temperature. In this paper, crankcase dynamic pressure is measured according to crankcase inner flow area. Also engine friction and maximum oil temperature are measured in each case and the relationships of data are established. In this test, making lower crankcase dynamic pressure has effects on increase of power about 1O.9PS, inlprovement of fuel economy about 5% at 2000rpm BMEP 2.0bar, decrease of maximum engine oil temperature more than 10°C at 3000rpm.<br/> <br/> "rJL7]~%D1 : Crankcase Pumping(3."}J3.7I]0]6 ~>g), Friction(U}~)<br/> <br/> <br/> I. AI e<br/> ~2.Ql ;<j-%::,} ~~ ~ 't!tlj9] ".PJ4 Uij7]7} 69] AHJ-, j1~ej~, ~~Pd ".PJ %~ ,*~.2.<br/> .S'.. 7ij~£jj1 ~.2.aj, 0];;; ~1>JJ aj ei 7}.A] 't!~<br/> "J~ ~ !'i"d 711~, Ai u}~~, ~"J'~ %°] ~<br/> ~£jj1 ~ct. A-j u}~~ ~1>JJ lIj6~ '1J9] A-j<br/> "J~~, ~~ul]<>]'1J -'3j~ ~ ~9] ~~ '!!!8 E<br/> ~]'?l U}~ A-j7,}<li %°] ;<Jl<li£jj1 ~j1, ~"J'~<br/> -~ ~?;\I ~~9] ~"i:J~7} {>Ai]o]C}.<br/> ~"i:J~<>1] ute} ~~.Q.j 3."}J3.7I]0]A %"J' ~<br/> AJ§.:tl9] %% 'B.~o] ~D1 ~j1 ~ct. -'3j{!%'];\<br/> &-% 7]'{toI] ~D1Ai o]ei~ 3."}J3.7I!oj6 %"J'<br/> ~ %% 'B.~.Q] ~~::: 3."}J3.7I]0]A 4]<>1] 4£ ~ ~>g ~% %~~ 'T- ~C}. o]eW ~>g<br/> <br/> . ~i'!, 'ljt:ljA}%:'} 3I}"'~§,,11,{]'i'i-T~<br/> <br/> <br/> €-1!50 ~~ U}~.Q.j ~¥-.S'.. '3Htttaj, 't!tll, ~ ~ %4 ~~ ~~ Ad~<>11 u]><]::: ~"Jo] AJ7Jtt.J1, ~~.2..~ .g.£ AJ15-, 1!~c-j <5j]E..2..<M E. ;,1]'?l ~"J'4 ~~ ~;<Jl£ 0):7]A]Z!ct.l)<br/> ~ ~<>1]A-j:::, 3."}J3.7IjO]6 4]<>11Ai9] 1!~ cW9] %% 'B.~<>11 ut~ 3."}J3.7I]0]6 ~-'1J OJ ~% ~"dtt~.2.aj, °1<>1] ut~ ~~ "d~ \'!~<br/> ;;; 3IiJ7}tt~C}.<br/> <br/> 2. ~2J ~xl :ill ~2J gf'EJ<br/> <br/> 2.1~~~xl<br/> ~ 1!"IJ ~ ~~~<>11 ~D1 },}%~ °J!~.Q] ;<J]-'II ~ Table. 1.<>1] y.Ej-';I) U}9} ~~ -'3j~ 47]% .A} %><1-% 7l-1t~ ~~o]C}. EE~~ },}%~ -mAi::: z.} 1!~C17} W]~ 3."}J3.7I]0]A9] ~r~% ~ "ai>}7] ~~ ~r~ -mAl 3."}J3. o&~% ~"ai>}<br/> <br/> <br/> - 106 <br/>
원영호(YoungHo Won),김우태(WooTae Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Two-dimensional laser visualization methods have been used in the study of breakup and atomization processes of non-evaporating diesel sprays. A single-hole spray injected into a quiescent atmospheric environment was visualized by the LIF(Laser Induced Fluorescence) and scattering technique. The LIF technique could be implemented to take the images which are magnified enough to show liquid ligaments and small droplets. The spontaneous scattering and fluorescent images of sprays were also taken to investigate the atomization of droplets. In the tip and periphery of a spray, the bright scattering light and lower fluorescent/scattering intensity ratio indicate the very high number density of droplets which are well atomized.
CAI 엔진의 배기밸브 타이밍 변화에 따른 실린더 내 유동 및 혼합 특성에 대한 연구
이주형(Joohyung Lee),김호영(Hoyoung Kim),김진남(Jinnam Kim),김우태(Wootae Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Recently the environmental pollution becomes serious global problem, so the emission regulation is strengtened. Therefore it is very important to reduce the NOx and particle matter(PM) simultaneously in conventional engines. By this reason, Controlled Auto Ignition(CAI) engines are spotlighted because it reduced NOx and PM simultaneously. There are some indirect method to control the auto ignition, using low vapor pressure fuel, controling the fuel injection timing, increasing intake air temperature and compression ratio, and increasing charged gas temperature by internal EGR.<br/> This paper reports the effects of exhaust valve timing on the flow and mixing characteristics of CAI engine. Controling EVC is more effective method to the fraction and uniformity of internal EGR than controling EVO. Retarding EVC, mean temperature, internal EGR fraction is decreased, but uniformity is increased.