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고속 점멸 주파수에서의 팬텀어레이 효과에 대한 컬러 LED의 시인성 연구
이찬수(Chan-Su Lee),임동규(Dong-Gyu Lim),전소희(So-Hee Jeon),정채연(Chae-Yeon Jeong),김준기(Jun-Gi Kim),박현수(Hyensou Pak) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.7
The phantom array effect is a type of Temporal Light Artifact(TLA). Recently, as LED lighting is widely used in automotive lighting as well as general lighting, a phenomenon related to this has been dealt with importance. Recently, it has been reported that a phantom array effect can be detected even at high-speed flashing frequency above 11㎑. This study extends the experiment from a white LED source to color LEDs to find out the chromatic difference of the visibility of the phantom array effect. From the results of the second experiment on the visibility of the phantom array effect from 1㎑ to 11㎑ in 1㎑ steps using 10 university students, the visibility threshold frequency of the phantom array effect is in order of Red≅Green>White>Blue. This experimental result shows that the phantom array effect of color LEDs can be detectable at high-speed flashing light of 11㎑, and that the critical threshold frequency varies depending on the color of the LED light source.
임동규 국립특수교육원 1995 특수교육연구 Vol.2 No.-
The puposes of this study were first, to invesgate the type of mainstreaming for hearing-impaired students. second, to invesgate the way of adjustment of H-I students to normal hearing schools, and third, to study kind of follow up services for the H-I students. The subjects of this study were 56 H-I students who were enrolled in elemently school, junior and senior high schools, and 56 parents of them. The summary of the results are followings. 1. Mothers with H-I students had mostly influenced the dicison on their children's teacher made compromised opinion with children's mainstreaming. 2. The intergrated H-I students often had troubled to understand what their teachers said, and they matually felt difficultes to communicate. The reasons for it were that the H-I studens couldn't hear their teachers well, and the contents of teachers speech were too difficult for them. 3. They showed positive thoughts on the relationship with their normal hearing peers because they felt their hearing peers were very kinds to them. in relation-ship with H-I friends, although they like H-I friends helped them better than H-I peers did. 4. The mainstreamed students attended in the meeting in H-I school if no special reasons because were able to meet their old H-I friends. 5. The parent with mainstreamed children showed high degree on satisfaction with their children's adjustment to normal hearing school. The benefit of mainstreaming they felt was that their children have had positive posonality.
변형률 측정을 이용한 추진기관용 Al 합금의 파괴인성 평가
김재훈,김덕회,임동규,박성욱,문순일 한국산업안전학회 2002 한국안전학회지 Vol.17 No.3
The fracture toughness is evaluated by using CT(compact tension) and 3PB(thress point bending) specimens of A1 alloys for propulsive engine. To evaluate the static fracture toughness, strain gage method is used. The static fracture toughness obtained from the strain measurement is compared with the results by ASTM standard and FEM analysis. For the reliable evaluation of fracture toughness, strain gages are attached at various positions.