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이동훈(Donghun Lee),정민근(Min K. Chung),김정룡(Jung Young Kim) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.3
This study investigated perceived discomfort and reasons related to use three information technology products (personal computer, mobile phone and digital television remote controller), and extracted the universal design factors. 240 people (30 females and 30 males for four age groups) participated in the one-to-one interview type of questionnaire, and replied to degree of discomfort at level of items and the reasons of discomfort at level of detailed elements for each product. As a result, almost all age groups answered that using input buttons of mobile phone and remote controller and watching display of mobile phone caused discomfort. Binary logistic regression of the detailed elements showed that response rate of discomfort mostly increased with age, except for specific elements such as shape of mouse and remote controller, and location of function button of mobile phone. Some of the detailed elements had high response rate of discomfort from all age groups. The age groups also showed similar tendency for the elements to select one alternative for the reason of discomfort, but not for sound volume and size of mobile phone and button sensitivity of remote controller. Finally, the universal design factors were extracted for each product based on the results, and divided into common factors and factors classified by the age group. Through this study, we identified using practices of various age groups and their demands for the products. It is expected that extracted detailed elements can be considered as important design factors to design the products universally.
팀 기반 학습에서 지각된 태만이 학습참여에 미치는 영향과 교수설계변인의 조절효과
이동훈(Donghun Lee),송해덕(Hae-Deok Song) 중앙대학교 한국교육문제연구소 2016 한국교육문제연구 Vol.34 No.4
본 연구는 팀 기반 학습에서 학습자의 지각된 태만과 학습참여 간 관계에서 교수설계변인이 갖는 조절효과를 검증하는 것을 목적으로 하였다. 이를 위해 국내 A대학에 재학 중인 대학생 328명을 대상으로 설문조사를 실시하였다. 지각된 태만이 학습참여에 미치는 영향을 검증하기 위해 회귀분석을, 두 변인의 관계에서 교수설계변인이 갖는 조절효과를 검증하기 위해 위계적 회귀분석을 실시하였다. 연구의 결과는 다음과 같다. 첫 번째, 지각된 태만은 학습참여의 하위변인들인 인지적 참여, 정서적 참여, 행동적 참여에 영향을 미친다. 두 번째, 교수설계변인은 지각된 태만과 학습참여 간 관계에서 조절효과를 갖는다. 세 번째, 교수설계변인의 하위 변인인 ‘수업목표’, ‘교재 및 자료’, ‘수업방법’이 지각된 태만과 인지적 참여 사이에 조절효과를 갖는 것으로 분석되었다. 본 연구 결과는 향후 팀 기반 학습에서 발생할 수 있는 태만이 학습자의 학습 참여를 저하시킬 수 있으므로 이를 방지하는 것이 중요하며, 학습참여 저하 방지를 위하여 수업목표를 명확히 하고, 적절한 교재 및 자료를 제공하여 학습자의 학습효능감을 향상시키며 구체적인 수업방법을 설계하여 학습자의 참여를 유도하는 등의 교수설계가 필요함을 시사하고 있다. The purpose of this study is to examine moderating effects of the instructional design variables between students’ perceived loafing and student engagement in a team-based learning environment. For this, a online questionnaire survey was administered to 328 university students. A regression analysis was conducted for determining the effects of students’ perceived loafing on student engagement. A hierarchical analysis was also conducted for analyzing the moderating effects of instructional design variables between students’ perceived loafing and students engagements. The results of this study were as follows. First, perceived loafing negatively affects three subtypes of student engagement: cognitive engagement, emotional engagement, and behavior engagement. Second, instructional design variables have moderating effects between perceived loafing of students and students’ engagement. In particular, three instructional design variables (instructional objectives, instructional materials, and teaching method) have moderating effects between students’ perceived loafing and students’ engagement. In conclusion, perceived loafing should be prevented in team-based learning because perceived loafing may have negative effects on student engagement. Thus, instructional design variables should be carefully employed to enhance students’ engagement: a) instructional objectives should be targeted clearly; b) adequate instructional material should be provided to improve self-efficacy; and c) specific teaching methods should be designed to prompt active students participation.
이동훈(Donghun Lee),유경원(Gyungwon You),최성만(Seongman Choi),김형모(Hyungmo Kim),박부민(Poomin Park),최영호(Youngho Choi),전병호(Byungho Jeon),박수형(Soohyung Park) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.11
초소형 터보제트엔진에 적용되는 슬링거연소기를 개발하고 리그시험을 수행하였다. 슬링거연소기에 적용하기 위하여 고속으로 회전하는 회전연료노즐을 설계, 제작하고 분무시험을 통해 연소에 적합한 액적크기와 분포를 얻었다. CFD를 이용해 연소기 내부 유동장을 해석하였으며, 연소리그시험을 통해 설계점에서 11.2%의 압력손실, 99.8%의 연소효율을 달성하였다. A slinger combustor which can be applied to micro turbojet engine has been developed with the combustor rig test. A rotating fuel injector with high speed rpm was designed, manufactured and tested to apply into slinger combustor through spray test and adequate droplet size and spray distribution were achieved. The CFD was used to analyze internal flow of the combustor. We found out that the combustor shows 11.2% of pressure loss and 99.8% of combustion efficiency at full combustor rig test.