• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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• pp.73-76
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• 2009

The optical structure of edge-lit LED backlight has been optimized via simulation study in order to remove bright spots appearing on the entrance region of the light guide plate (LGP) and thus to improve the luminance uniformity. The density of scattering dots located on the back surface of LGP was adjusted according to the location of LED's. In addition, lenticular lenses or a diffuse transmissive surface were formed on the side surface of LGP facing the LED's, and the density of lenticular lenses was optimized for redistributing rays emitted from LED's into wider angles. The bright spots which could be seen from conventional LED backlight were removed by the combination of these two optical structures. The application of diffuse surface to the entrance face gave better uniformity than the application of lenticular lenses. However, dark regions still appear on the entrance region of LGP, which should be removed by more appropriate optical design for achieving better luminance uniformity on the LED backlight.

• 대한기계학회논문집
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• 제7권3호
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• pp.294-300
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• 1983

The purpose of this study is to investigate the radiant emission characteristics of diffuse equi-lateral trapezoid groove cavity for the case of uniform surface temperature. The theoretically developed results for the apparent emissivity are presented and the values of apparent emissivity for the trapezoid groove cavity were compared with those of the V-groove cavity. In the experimental part of this study, the test models were manufactured from 100x 100x 15mm copper plates on which the equi-lateral trapezoid cavities were grooved. The inclined angles of the groove were 30,45 and 60 degrees and the ratio of groove depth to base surface width varied from 1 to 5 for each inclined angle. As a result of this work, it was found that the trapezoid groove cavity was more general form of V-groove and the apparent emissivity of trapezoid groove cavity was greater than that of V-groove cavity. The resulting equation for the apparent emissivity in the trapezoid groove cavity was valid for the angles greater than 40 degrees.

• 한국결정성장학회지
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• 제8권4호
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• pp.581-586
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• 1998

초크랄스키 실리콘 기판의 뒷면에 형성된 기계적 손상이 미치는 효과에 대하여 고찰하였다. 기계적 손상의 정도는 레이저 여기/극초단파 반사 광전도 감쇠법에 의한 소수반송자 재결합 수명, X-선 단면 측정 및 습식 산화/선택적 식긱 방법으로 평가하였다. 그 결과, 웨이퍼 뒷면에 가해지는 기계적 손상의 세기가 강할수록 소수반송자 재결합 수명은 짧아지고, 산만 산란 정도와 X-선 과잉 강도의 적분값은 비례적으로 증가하였으며, 그 값을 Grade 1의 손상된 웨이퍼에서의 과잉 강도로 정규화하면 과잉 강도의 상대 정량비는 Geade 1:Grade 2:Grade 3 = 1:7:18.4이다.

• 대한세포병리학회지
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• 제12권1호
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• pp.67-71
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• 2001

Primary malignant lymphoma of the thyroid gland is uncommon malignancies. Its fine needle aspiration cytology (FNAC) findings are rarely described in the literature. This article highlights the FNAC diagnosis of primary malignant lymphoma of the thyroid gland. A 70-year-old female presented with a rapidly enlarging thyroid mass of five months' duration. FNAC smears showed low cellularity consisting of predominantly atypical enlarged lymphoid cells admixed with a few small lymphocytes, plasma cells, and oncocytic cells. Some disrupted lymphoid cells were also present. The tumor cells infiltrated into the thyroid follicular epithelium forming lymphoepithelial lesion, The cytologic appearance showed a diffuse mixture of cell types with only a few small, mature lymphocytes and many enlaraed lymphoid cells. The enlarged lymphoid cells were atypical and pleomorphic with nuclear clefting and irregularities. Grossly, the left lobe of the thyroid was nearly replaced by a diffuse firm to soft solid mass with smooth tan fish-flesh homogeneous cut surface. Histological diagnosis was diffuse large B-cell lymphoma with areas of marginal zone B-cell lymphoma of MALT type.

• 천문학회보
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• 제42권2호
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• pp.76.3-76.3
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• 2017

We compare vertical profiles of the extraplanar $H{\alpha}$ emission to those of FUV and NUV emission for 39 nearby edge-on galaxies to investigate the origin of the extraplanar $H{\alpha}$ emission. A strong correlation between scale heights of the extraplanar $H{\alpha}$ and UV emissions is found. This may indicate that the diffuse extraplanar $H{\alpha}$ emission either co-exists with the extraplanar dust or originates from the similar mechanism as the diffuse extraplanar UV emission such as scattering of $H{\alpha}$ photons at diffuse extraplanar dust. The scale heights of the extraplanar $H{\alpha}$ and UV emissions are also compared with size, star formation rate, and star formation rate surface density of the host galaxies to figure out what is the most important parameter associated with the extraplanar emission.

• 한국동물위생학회지
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• 제22권4호
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• pp.405-410
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• 1999

A 7 month old male shepherd was presented with anorexia, diarrhea, and salivation, and euthanized due to no clinical improvement. Grossly, ulcers were seen on ventral surface of tongue and stomach. The mineralization was obvious in the intercostal space, lung and inner surface of aorta. Kidney was pale, firm and irregular. Histopathology confirmed uremic pneumonitis, end stage kidney and hyperplasia of parathyroid. This case was the typical uremic condition of juvenile dog, which was characterized the diffuse soft tissue mineralization due to hyperparathyroidism secondary to chronic renal failure.

• 천문학회보
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• 제42권1호
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• pp.27.3-27.3
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• 2017

One of the major discoveries in extragalactic astrophysics made over the past few years is the detection of ultra-diffuse galaxies, a new type of galaxies which appear to be far more numerous than normal galaxies, and which are giants in terms of size, yet dwarfs in terms of luminosity. These galaxies point to the huge discovery potential of the last niche that remains to be explored in observational parameter space: the sky at extremelylow surface brightness. Implications for objects in the Solar System, stellar physics, the interstellar medium, galaxies and cosmology will be addressed, along with the major challenges for pushing the frontiers in ground- and space-based observations.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 춘계학술발표대회 논문집
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• pp.8-12
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• 2009

The Knowledge of the solar radiation components are essential for modeling many solar energy systems. This is particularly the case for applications that concentrate the incident energy to attain high thermodynamic efficiency achievable only at the higher temperatures. In order to estimate the performance of concentrating thermal systems, it is necessary to know the intensity of the beam radiation, as only this component can be concentrated. The Korea Institute of Energy Research(KIER) has began collecting solar radiation component data since August, 2002. KIER's component data will be extensively used by concentrating system users or designers as well as by research institutes. The Result of analysis shows that the annual-average daily diffuse radiation on the horizontal surface is $1,458cal/m^2$ and daily direct radiation on the horizontal surface is $1,632cal/m^2$ for all over the 16 areas in Korea.

• 한국태양에너지학회 논문집
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• 제29권3호
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• pp.12-18
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• 2009

The Knowledge of the solar radiation components are essential for modeling many solar energy systems. This is particularly the case for applications that concentrate the incident energy to attain high thermodynamic efficiency achievable only at the higher temperatures. In order to estimate the performance of concentrating thermal systems, it is necessary to know the intensity of the beam radiation, as only this component can be concentrated. The Korea Institute of Energy Research(KIER) has began collecting solar radiation component data since January, 2002. KIER's component data will be extensively used by concentrating system users or designers as well as by research institutes. The theoretical analysis of solar radiation as a component has compared with the experimental data obtained by the KIER station. The Result of simulation analysis shows that the annual-average daily diffuse radiation on the horizontal surface is $1,457cal/m^2$ and daily direct radiation on the horizontal surface is $1,632cal/m^2$ for all over the 16 areas in Korea.

• 대한기계학회논문집
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• 제12권6호
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• pp.1381-1389
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• 1988

본 연구에서는 앞서의 여러 경우에서 단순하게 취급 되었던 화염면과 연료표 면의 경계조건을 무한히 길고, 평행한 확산, 회색 평판(gray, diffuse plates)으로 보 고, 이 두 평판 사이에 흡수(absorbing), 방사(emitting), 산란(scattering)을 하는 회색매질(gray medium)이 차여져 있다고 생각한다. 이런 가정하 에서, 여러 매개변 수들을 변화시켜가며 전도, 대류, 복사열전달들의 상호작용과 온도 분포를 수치적으로 해석하였다. 특히 화염면과 연료표면간의 열교환에 있어서의 분출에 의한 효과와 복 사열전달의 영향에 관심을 기울였다.