• 전자공학회논문지 IE
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• 제46권3호
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• pp.12-18
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• 2009

본 논문은 LED 디스플레이 시스템에서 균일하고 부드러운 영상표출을 위하여 각각의 Red, Green, Blue LED의 휘도를 조절하여 흰색보정을 유지할 수 있는 프로세서를 설계하였다. 이 프로세서는 일반적인 LED소자의 특성곡선을 근거로 "a"를 고유특성 값, "b"를 사용시간에 따른 휘도보정 값, "X"를 구동전류 값, "Y"를 휘도 값이라 할 때, "Y=aX+b"로 설정되는 휘도 특성함수에 의하여 각 픽셀의 휘도에 따른 구동 전류 값을 산출하여 휘도를 보정하고, 또한 장시간 사용 시 LED소자의 휘도 저하 문제를 해결하기 위하여 "b"값을 조절하여 LED 디스플레이 시스템의 전체 평균 휘도 값을 상향시킬 수 있도록 구현하였다.

• Nuclear Engineering and Technology
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• 제56권4호
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• pp.1544-1551
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• 2024

A unique brick series based on Vietnamese clay was manufactured at 114.22 MPa pressure rate for γ-ray attenuation purposes, consisting of (x) metallic waste & (90%-x) red clay mineral & 10% (hardener mixed with epoxy resin), where (x) is equal to the values 0%, 20%, 40%, 50%, and 70%. The impacts of industrial metal waste ratio in the structure and radiation protective characteristics were evaluated experimentally. The increase in metallic waste doping concentrations from 0% to 70% was associated with an increase in the manufactured brick's density (ρ) from 2.103 to 2.256 g/cm³ while the fabricated samples' porosity (Φ) decreased from 11.7 to 1.0%, respectively. Together with a rise in fabricated brick's density and a decrease in their porosities, the manufactured bricks' γ-ray attenuation capacities improved. The measured linear attenuation coefficient (μ, cm^-1) was improved by 30.8%, 22.1%, 21.6%, and 19.7%, at E_γ equal to the values respectively 0.662, 1.173, 1.252, and 1.332 MeV, when the metallic waste concentration increased from 0% to 70%, respectively. The study demonstrates that manufactured bricks exhibit superior radiation shielding properties, with radiation protection efficiencies of 88.4%, 90.0%, 91.7%, 92.1%, and 92.4% for bricks with industrial metal waste contents of 0%, 20%, 40%, 50%, and 70%, respectively, at γ-ray energy (E_γ) of 1.332 MeV.

• 대한환경공학회지
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• 제31권11호
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• pp.1019-1024
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• 2009

가시광 활성을 갖는 anatase 결정구조의 $TiO_2-_xN_x$ 나노입자를 암모니아 수용액에서 $TiCl_4$ 가수분해에 의해 제조하였다. 제조한 시료의 특성은 XRD, TEM, $N_2$-sorption 및 DRS로 분석하였다. 질소를 $TiO_2$에 도핑함으로써 광흡수 영역이 순수한 TiO2에 해당하는 390 nm에서 가시광 영역인 530 nm까지 이동하였다. DRS 분석결과로부터 $TiO_2-_xN_x$의 밴드갭이 감소하는 것을 유추할 수 있었다. 광촉매 활성은 가시광 조사하에서 congo red 분해로부터 평가하였다. 질소의 도핑 농도가 적절한 광촉매가 광촉매 활성이 가장 높게 나타났다. 이러한 결과로부터 질소 도핑이 광촉매 활성의 향상에 중요한 역할을 함을 확인할 수 있었다.

• 약학회지
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• 제13권2_3호
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• pp.93-96
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• 1969

X-ray diffraction analysis of Yung-Sa, an inorganic chinese drug in Korea, revealed the following: 1. "Yung-Sa" is red mercuric sulfide crystal (Vormillion) which is cinnabar type of hexagonal system. 2. It is accurate to call "Yung-Sa" synthetic red mercuric sulfide. 3. "Chung-Sa-Du" is mixture of crystals of cinnabar and meta-cinnabar types.

• 한국전기전자재료학회논문지
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• 제25권6호
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• pp.456-461
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• 2012

We studied the emission characteristics of white phosphorescent organic light-emitting diodes (PHOLEDs), which were fabricated using a two-wavelength method. To optimize emission characteristics of white PHOLEDs, white PHOLEDs with red/blue, blue/red and red/blue/red emitting layer (EML) structures were fabricated using a host-dopant system. In case of white PHOLEDs with red/blue structure, the best efficiency was obtained at a structure of red (15 nm)/blue (15 nm). But the emission color was blue-shifted white. In case of white PHOLEDs with blue/red structure, the better color purity and efficiency were observed at a blue (29 nm)/red (1 nm) structure. For additional improvement of color purity in white PHOLEDs with blue (29 nm)/red (1 nm) EMLs, we fabricated white PHOLEDs with red (1 nm)/blue (28 nm)/red (1 nm) structure. The current efficiency, external quantum efficiency, and CIE (x, y) coordinate were 27.2 cd/A, 15.1%, and (0.382, 0.369) at 1,000 $cd/m^2$, respectively.

• 한국응용곤충학회지
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• 제12권3호
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• pp.109-114
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• 1973

불개미를 송충의 천적으로 이용하기 위하여 경남지방에 있어서 불개미의 분포, 일만 생태, 이식가능 한계기 등을 조사한 결과를 요약하면 다음과 같다. 1) 블게미는 1-3령기인 송충을 포식하였다. 2) 경남 지방의 불개미의 분포는 18개군 474개소에 분포하고 있으며 총면적은 $7,702,559m^2$였다. 3) 불개미 집의 분포는 하부에 $60\%$, 중부에 $39.5\%$ 및 상부에 $0.5\%$였다. 4) 조소의 높이와 군세는 정비례하며 회귀 방정식은 Y=6,200 X-27,813이였다 또한 조소와 수분과의 관계가 있음을 알 수 있었다. 5) 불개미의 이식 한계기는 5월-9월이었고 불개미를 이식한 바 1연간에 5개의 집을 만들었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.70-71
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• 2021

An increasing amount of red mud (RM) is being generated globally with the growth in alumi-num production. To avoid the RM becoming a pollutant, methods for effectively recycling RM at a low cost are being investigated. This study proposes a method for recycling RM as a construc-tion material. The cement paste with neutralized liquefied red mud had higher compressive strength than that of plain cement paste and cement paste with liquefied red mud without neutralization at 1 d of aging; this indicates that nitric acid neu-tralization increases the early-age strength.

• 전기화학회지
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• 제12권3호
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• pp.234-238
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• 2009

In the excitation spectra of $YNbO_4$ : $Eu^{3+}$, the charge transfer (CT) band around 270 nm due to $[NbO_4]^{3-}$$-Eu^{3+}$ interaction and sharp excitation peaks by f-f transition of $Eu^{3+}$ strongly appeared simultaneously. CT band depended on the structural properties of powders, showing the red-shift with increasing the crystallinity, while the f-f transition peaks were independent of the crystallinity. For $YNb_{1-x}Ta_xO_4$ : $Eu^{3+}$ (x = 0.05.0.2), $[TaO_4]^{3-}$. configuration was locally constructed, leading to the blue-shift in CT band and the decrease in the red emission intensity with increasing the Ta content.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1067-1070
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• 2006

We have demonstrated highly efficient WOLED with two separated emissive layers using a blue fluorescent dye and a red phosphorescent dye. The maximum luminous efficiency of the device was 11.2 cd/A at $20\;mA/cm^2$ and $CIE_{x,y}$ coordinates varied from (x = 0.33, y = 0.37) at 6V to (x = 0.25, y = 0.33) at 14V.

• Asian-Australasian Journal of Animal Sciences
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• 제8권4호
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• pp.353-356
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• 1995

The red cell X-protein, NADH-diaphorase 1, malic enzyme and serum arylesterase phenotypes of 50 Thai Longtail and 53 Cameroon X Thai Longtail ($F_1$) crossbred sheep were determined by horizontal starch gel electrophoresis. None of the economic traits was influenced by DIA1, ME and EsA phenotypes. However, XP phenotypes showed a highly significant association with body weight, body height, heart girth and back girth, with mean values of XP+ve phenotype greater than XP-ve. The $XP^+$ allele was associated with greater body weight, body height, heart girth and back girth.