• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.810-813
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• 2003

Application of inorganic silica-neodymia alloy films grown by sputtering technology to the dielectric layer of plasma display panel (PDP) is presented. The experimental results reveal that dielectric constant of the alloy films increases with neodymia concentration. Also, the alloy films act as band rejection color filter owing to sharp absorptions originating in the intratransition within the 4f shell of the $Nd^{3+}$ ion. In the optical band pass region, the transmittances of the alloy films show higher than those of commercial glass-like dielectrics. As a result, the luminance of PDP device with the alloy dielectric layer is higher than that of device with conventional dielectrics, indicating wider color gamut and higher color purity.

• 대한원격탐사학회지
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• 제23권3호
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• pp.171-179
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• 2007

Hyperspectral images have shown a great potential for the applications in resource management, agriculture, mineral exploration and environmental monitoring. However, due to the large volume of data, processing of hyperspectral images faces some difficulties. This paper introduces the development of an image processing tool (HYVIEW) that is particularly designed for handling hyperspectral image data. Current version of HYVIEW is dealing with efficient algorithms for displaying hyperspectral images, selecting bands to create color composites, and atmospheric correction. Three band-selection schemes for producing color composites are available based on three most popular indexes of OIF, SI and CI. HYVIEW can effectively demonstrate the differences in the results of the three schemes. For the atmospheric correction, HYVIEW utilizes a pre-calculated LUT by which the complex process of correcting atmospheric effects can be performed fast and efficiently.

• 대한전자공학회논문지SP
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• 제40권2호
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• pp.11-19
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• 2003

본 논문에서는 3대역 RGB카메라를 이용하여 분광 반사율을 추정할 때 추정오차를 개선하는 방법을 제안한다. 제안된 방법에서는 색상의 영역별로 적응적인 주성분 집합을 구성함으로써 추정오차를 줄였다. 이때 적응적인 주성분 집합을 구성하기 위하여 Lloyd양자화기 설계 알고리즘을 적용하여 N개의 주성분 집합을 구성하기 위한 분광반사율 모집단을 구성하였다. 전체 모집단으로 사용한 1485 Munsell 색시료의 대표값을 찾아내기 위해서, 초기값으로 Macbeth Color Checker를 사용하였으며 Lloyd 알고리즘의 반복 적용으로 분광 반사율 모집단 전체를 영역별로 분류하고 각 영역에 대하여 주성분 분석을 통해 적응적인 주성분 집합을 구성하였다. 실험 결과, 제안한 방법은 색차 및 분광 반사율에 대한 평균자승오차가 기존의 두 가지의 3대역 주성분 분석 방법 및 5대역 위너 추정을 이용한 분광 반사율 추정 방법보다 개선됨을 확인하였다.

• 한국광학회지
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• 제29권6호
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• pp.268-274
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• 2018

본 연구에서는 1차원 포토닉 크리스탈과 금속-유기 구조체 (MOF) 물질인 Hong Kong University of Science and Technology(HKUST-1)을 이용한 수분 감지 컬러 센서를 제안한다. 1차원 포토닉 크리스탈은 주기적인 굴절률 변화에 의해 포토닉 밴드갭이 존재하고, 특정한 파장 대역의 광 성분을 차단 및 반사한다. HKUST-1의 굴절률은 건조한 환경과 습한 환경에서 그 값이 서로 다르다. 여기서 우리는 포토닉 밴드갭의 유무를 활용하여 FDTD 시뮬레이션으로 센서를 설계하였다. 광학 해석 결과, 투과된 광의 색 변환보다 반사된 광의 색 변환이 우수하여 반사된 광을 이용하였다. 그리고 포토닉 밴드갭의 중심 파장이 550 nm인 경우, 건조한 환경 대비 습한 환경의 최대 피크 값이 약 9.5배로 증가했으며, 무채색에서 녹색으로 색 변환이 가능하여 센서로의 특성이 우수하였다. 본 연구 결과는 MOF 물질의 수분 감지 컬러 센서로의 활용을 제시하였으며, MOF 물질의 나노 구조 설계로 산업 디바이스로의 활용성도 확대할 것이다.

• 천문학회보
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• 제39권1호
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• pp.48.1-48.1
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• 2014

Galaxy clusters, the largest gravitationally bound systems, are an important means to place constraints on cosmological models. Moreover, they are excellent places to test galaxy evolution models in connection to the environments. To this day, massive clusters have been found unexpectedly(Kang & Im 2009, Durret et al. 2011, Tashikawa et al. 2012) and evolution of galaxies in cluster have been still controversial (Elbaz et al. 2007, Cooper et al. 2008, Tran et al. 2009). Finding galaxy cluster candidates at z>1 in a wide, deep imaging survey data will enable us to solve the such issues of modern extragalactic astronomy. We report new candidates of galaxy clusters and their physical properties in one of the wide and deep survey fields, European Large Area ISO Survey North1(ELAIS-N1) and North2(ELAIS-N2) fields, covering sky area of and each. We also suggest a new useful color selection technique to separate 1 < z < 2 galaxies from low-z galaxies by combining multi-wavelength data from the UKIRT Infrared Deep Sky Survey Deep Extragalactic Survey (UKIDSS DXS/J and K band), Spitzer Wise-area InfraRed Extragalactic survey (SWIRE/two mid-infrared bands), Canada France Hawaii Telescope (CFHT/z band), Issac Newton Telescope(INT/ u, g, r, i, z band) and Infrared Medium-deep Survey(IMS/J band).

• 대한원격탐사학회지
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• 제15권4호
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• pp.367-375
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• 1999

This paper describes the development, operations, and applications of ROCSAT-l and its Ocean Color Imager (OCI) remote-sensing payload. It is the first satellite program of NSPO. The satellite was successfully launched by Lockheed Martin's Athena on January 26, 1999 from Cape Canaveral, Florida. ROCSAT-l is a Low Earth Orbit (LEO) experimental satellite. Its circular orbit has an altitude of 600km and an inclination angle of 35 degrees. The satellite is designed to carry out scientific research missions, including ocean color imaging, experiments on ionospheric plasma and electrodynamics, and experiments using Ka-band (20∼30GHz) communication payloads. The OCI payload is utilized to observe the ocean color in 7 bands (including one redundant band) of Visible and Near-Infrared (434nm∼889nm) range with the resolution of 800m at nadir and the swath of 702km. It employs high performance telecentric optics, push-broom scanning method using Charge Coupled Devices (CCD) and large-scale integrated circuit chips. The water leaving radiance is estimated from the total inputs to the OCI, including the atmospheric scattering. The post-process estimates the water leaving radiance and generates different end products. The OCI has taken images since February 1999 after completing the early orbit checkout. Analyses have been performed to evaluate the performances of the instrument in orbit and to compare them with the pre-launch test results. This paper also briefly describes the ROCSAT-l mission operations. The spacecraft operating modes and ROCSAT Ground Segment operations are delineated, and the overall initial operations of ROCSAT-l are summarized.

• 천문학회보
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• 제42권2호
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• pp.76.2-76.2
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• 2017

We present Subaru Near-Infrared (NIR) photometry for globular clusters (GCs) in the giant elliptical galaxy NGC 4649 (M60) belonging to the Virgo cluster. NIR data are obtained in Ks-band with the Subaru/MOIRCS, and matching HST/ACS optical data available in literature are used to explore the origin of GC color bimodality. A clear bimodal color distribution is observed in the optical color (g-z), in which the ratio between blue and red GCs is 4:6. By contrast, the more metallicity-sensitive optical-NIR colors (g-Ks, z-Ks) show a considerably weakened bimodality in their distributions. The color-color relation of the optical and NIR colors for the GC system shows a nonlinear feature, supporting that the optical color bimodality observed in NGC 4649 GC system is caused by nonlinear color-metallicity relations (CMRs).

• 고려인삼학회:학술대회논문집
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• 고려인삼학회 2002년도 학술대회지
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• pp.467-476
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• 2002

A large number of individual ginseng plants have been selected in the farmer's fields to develop new ginseng varieties with desirable traits since 1970s. Among them, Hwangsukjong with green stem and yellow berry was selected as a ginseng germplasm. The phenotype of Hwangsukjong is quite different from Jakyungjong that has violet stem and red berry and has been cultivated in most of ginseng fields. Therefore, Hwangsukjong was crossed with Jakyungjong to clarify the inheritance of stem color and then the characteristics of $F_1\;and\;F_2$ hybrids were investigated. $F_1$ hybrid plants were similar to Jakyungjong in most of aerial part characters and showed hybrid vigor in fresh weight of root and weight of 100 seeds. In $F_2$ generation, the stem color was segregated in a ratio of 3 violet to 1 green. From this result, it was elucidated that violet color was controlled by single dominant gene. In another experiment, DNA was extracted from parents (Jakyungjong and Hwangsukjong) and $F_1$ hybrid. For each primer evaluated, multiple band profile was produced comprising from one to five major bands plus a varying number of minor bands and amplified bands were detected among most primers. In case of UBC primer number 13, 17, 30, 31, and 43, band patterns of parents and $F_1$ hybrid were very similar, but the others were not. Especially, in {\sharp}1$, {\sharp}4$, and {\sharp}33$, specific band was produced in Hwangsukjong and $F_1$ hybrid while in {\sharp}6$, another specific band was produced in Jakyungjong and $F_1$ hybrid. Therefore, $F_1$ hybrid had all specific bands at these primers. So, these selective markers could be used for identification of characteristics of $F_2$ hybrids

• KSBB Journal
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• 제13권6호
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• pp.724-729
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• 1998

To develop a large scale countercurrent single pass heat exchanger for continuous transportation and sterilization of soybean paste, microflora and color value of sterilized soybean paste were examined at various sterile condition. Aerobes, anaerobes, molds, yeasts and lactic acid bacteria were 5.1 x 107 CFU/g, 7.1 x 107 CFU/g, 2.6 x 105 CFU/g, 4.3 x 106 CFU/g, 1.3 x 107 CFU/g, respectively in raw soybean paste. In gold band ampoule test, aerobes and anaerobes of soybean paste were viable up to 90$^{\circ}C$, but become unviable at 100$^{\circ}C$. Molds decreased rapidly and yeasts decreased slowly from 70$^{\circ}C$. Lactic acid bacteria were unviable at 60$^{\circ}C$ within 10 min. In color test, Hunter L, a, and b values of soybean paste were 50.2, +5.6, and +17.8, respectively. After heating in polyethylene film bag at 80$^{\circ}C$, Hunter values were not so much changed and become 50.2, +4.7, and +19.7, respectively. The micorflora and color of soybean paste sterilized in a large scale heat exchanger system resulted in very similar to those of gold band ampoule and polyethylene film bag by effective heat transfer.

• 한국전자통신학회논문지
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• 제13권3호
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• pp.669-676
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• 2018

GOCI(: Geostationary Ocean Color Imager)는 8개 밴드의 레일리 보정 반사도를 이용하여 수평 $500m{\times}500m$의 높은 공간 해상도로 해무를 탐지한다. 가시광선과 근적외선은 지표면의 특성을 강하게 반영하여 구름과 안개 판별에 오차를 유발한다. Band7 반사도의 임계값을 설정하여 육지로 유입되는 해무를 탐지할 수 있었다. Band4 반사도가 Band8보다 크게 나타나는 영역이 구름으로 판별되는 경우는 주변 영역과 평균 반사도의 비교를 통해 해무로 탐지되는 오류를 보정하였다. 개선된 알고리즘은 천리안위성(COMS: Communication, Ocean, Meteorological Satellite)의 안개 영상 및 기상청 시정계 자료와 비교하여 검증되었다.