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배재현,안희춘,김상우,Bae, Jae-Hyun,An, Heui-Chun,Kim, Sang-Woo 해양환경안전학회 2013 해양환경안전학회지 Vol.19 No.6
본 연구에서는 240 W급 고출력 LED 집어등의 특성을 기존 메탈 집어등과 비교하여 배광 패턴의 특성 및 광효율을 분석하고, 파장 대역의 특성을 해양 투과 특성 및 시감도를 고려하여 집어등 광원으로써 적정성을 분석하였다. 색온도 6500 K, white LED 패키지를 적용한 240 W LED 집어등의 특성을 보면 배광각은 ${\pm}45^{\circ}$, 조도 변화률이 0.8로 개선되었으며, 광효율은 98.8 lm/W로 향상되었다. LED 집어등의 해수의 투과율과 인간의 암순응시 시감도를 1,500 W 메탈등 1개와 4개의 240 W LED 집어등에 적용하여 비교한 결과, 방사출력이 수심 50 m에 이르면 거의 동등하였으며, 암순응시 시감도만을 적용한 경우에도 LED 집어등이 약 5 % 정도 높은 광속을 나타내었으며, 수심 50 m의 방사출력에 암순응시 시감도를 적용한 경우 LED 집어등의 광속이 14 % 높게 나타나 메탈등의 대체 가능성을 확인할 수 있었다. This study analyzed characteristics of 240 W high power LED lamps by comparing with those of traditional metal halide lamps. In addition, it analyzed the propriety of LED lamps as a source of light, considering seawater transmission characteristics. When Applying white LED package with the color temperature color temperature of 6500K, a 240W-LED fishing lamp has a characteristics of the luminous angle to be expanded to ${\pm}45^{\circ}$, the illumination change was improved to 0.8, as well as the luminance efficiency was improved to 98.8lm/W. As results of comparison between one 1,500W-metal halide lamp and four 240W-LED lamp with considering a seawater transmission and a luminous efficiency of scotopic vision, the radiant flux of two lamps were almost equal level at 50m depth and the luminous flux was 5% higher LED lamp than metal-halide lamp even if only applying the luminous efficiency of scotopic vision. As the luminous flux of LED lmap was 14% higher than that of metal-halide lamp with applying the luminous efficiency of scotopic vision to radiant flux at 50m depth, so LED fishing lamp was verified to alternative possibility of metal-halide lamp.
산화막 CMP에서 패드 두께가 연마율과 연마 불균일도에 미치는 영향
배재현,이현섭,박재홍,니시자와 히데키,키노시타 마사하루,정해도,Bae, Jae-Hyun,Lee, Hyun-Seop,Park, Jae-Hong,Nishizawa, Hideaki,Kinoshita, Masaharu,Jeong, Hae-Do 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.5
The polishing pad is important element for polishing characteristic such as material removal rate(MRR) and within wafer non-uniformity(WIWNU) in the chemical mechanical planarization(CMP). The result of the viscoelasticity measurement shows that 1st elastic modulus is increased and 2nd elastic modulus is decreased when the top pad is thickened. The finite element analysis(FEA) was conducted to predict characteristic of polishing behavior according to the pad thickness. The result of polishing experiment was similar with the FEA, and it shows that the 1st elastic modulus affects instantaneous deformation of pad related to MRR. And the 2nd elastic modulus has an effect on WIWNU due to the viscoelasticity deformation of pad.
80 MPa급 고강도 콘크리트를 적용한 RC 바닥판의 피로 성능 평가
배재현,황훈희,유동민,박성용,Bae, Jae-Hyun,Hwang, Hoon-Hee,Yoo, Dong-Min,Park, Sung-Yong 한국안전학회 2017 한국안전학회지 Vol.32 No.4
Recently, the use of high-strength concrete is increasing due to the trend of constructing high-rise and long span structures. The benefit of using the high-strength concrete is that it increases the durability and strength while it reduces the cross-sectional area of the bridge deck slabs. Moreover, it offers more safety as these bridge deck slabs applying high-strength requires strict structural performance verification. In this study, the fatigue performance of the bridge deck slabs applying 80 MPa high-strength concrete was verified through various experiments. The experimental results showed that the specimens satisfy the conditions of flexural strength, punching shear strength, deflection and cracking. In conclusion, the bridge deck slabs designed by 80 MPa high-strength concrete are enough safe despite of its low thickness.
식중독 유발 세균의 증식에 미치는 느릅나무 뿌리껍질 추출물의 영향
배재현,손정남,곽은정,Bae Ji-Hyun,Son Jeong-Nam,Kowk En-Jeong 동아시아식생활학회 2005 동아시아식생활학회지 Vol.15 No.2
This study was performed to investigate the antimicrobial effect of Ulmus davidiana var. japonica extracts against food-borne pathogens. First, Ulmus davidiana var. japonica was extracted with methanol at room temperature and the fractionation of the methanol extracts was carried out by using petroleum ether, chloroform, and ethyl acetate, and methanol respectively. The antimicrobial activity of Ulmus davidiana var. japonica extracts was determined by using a paper disc method against food-borne pathogens and food spoilage bacteria. The methanol extracts of Ulmus davidiana var. japonica showed the highest antimicrobial activity against Staphylococcus epidermidis and Escherichia coli. Finally, the growth inhibition curves were determined by using methanol extracts of Ulmus davidiana var. japonica against Staphylococcus epidermidis and Salmonella typhimurium. The methanol extract of Ulmus davidiana var. japonica had strong antimicrobial activity against Staphylococcus epidermidis at the concentration of 4,000 ppm. At this concentration, the growth of Salmonella typhimurium was retarded more than 48 hours and up to 12 hours for Staphylococcus epidermidis. In conclusion, the methanol extracts of Ulmus davidiana var. japonica inhibit efficiently Staphylococcus epidermidis and Salmonella typhimurium.
입자영상유속계를 이용한 은어 (Plecoglossus altivelis)의 유영능력 측정
배재현 ( Jae Hyun Bae ),이경훈 ( Kyoung Hoon Lee ),신종근 ( Jong Keun Shin ),양용수 ( Yong Su Yang ),이주희 ( Ju Hee Lee ) 한국어업기술학회 2011 수산해양기술연구 Vol.47 No.4
As a fish way is a structure for fish migrating well toward upper stream due to breaking river flow by a dam or dammed pool, the specific fish′s swimming ability is one of the main factors in making a plan and managing it. In addition, it also needs to understand the current field in fish road to evaluate its performance. This study is aimed to analyze the swimming patterns with current velocity changes using a Particle Imaging Velocimetry (PIV) in order to understand the swimming ability of silver fish (Plecoglossus altivelis) that is one of the fishes migrating through the fish way of Nakdong River, and to analyze the 2 dimensional current field near to silver fish at swimming momentum. The results showed that average values of tail beat frequencies for continuous swimming with current velocity were 2.8 Hz at 0.3 m/s, 3.2 Hz at 0.4 m/s, 3.8 Hz at 0.5 m/s, respectively. The wake would be produced by direction turning of fish′s tail fin and its magnitude would be verified by the difference of pressure. The pressure turbulent flow produced by its tail beat would be made in both sides, and then, the magnitude of wake should be the source of moving direction. The swimming momentum will help to support the primary factor in making a suitable design for specific fish species migrating toward the district river.