• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.40.1-40.1
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• 2010

인간의 삶과 밀접한 관련이 있는 태양 에너지는 전세계적으로 에너지 부족 문제 해결방안을 위한 대체 에너지 자원으로 각광 받고 있다. 즉 태양으로부터 방출되어 지표면에 도달하는 태양광은 연간 약 23,000 TW(Perez et al., 2009)로써 다른 어떤 종류의 에너지원보다 풍부하기 때문에 태양광 발전은 양적인 측면에서의 무한한 잠재력뿐만 아니라 환경적인 측면에서 무공해라는 장점을 가진다. 특히 국내에서는 2030년까지 태양광 에너지와 풍력 및 수소에너지들은 3대 국가 에너지 전략 분야로 집중 육성되고 있다(한국과학기술정보연구원, 2007). 지표면에 도달하는 태양 에너지 평가 및 분석을 위하여 일사계에 의한 관측 자료가 이용될 수 있으나 관측 영역 및 관측 정밀도 문제 때문에 태양 복사 모델(Solar Radiative Transfer Model)에 의한 계산 자료가 중요하게 활용된다. 이 연구에서 한반도의 지표면 태양광 계산을 위하여 사용된 모델은 Iqbal(1983)에 근거한 것으로써 단일 기층의 모형대기를 가정한 모델이며 상세 모델(Line-by-Line Model)에 의하여 보정하여 2009년 1월부터 2009년 12월까지 한반도의 지표면 태양광 시공간 분포를 계산하였다. 이 계산을 위하여 대기 중의 가스와 에어로졸 및 구름 성분들에 대한 모델 입력자료 등이 요구되며 이 자료들은 기상청의 수치 모델(Regional Date Assimilation and Prediction System; RDAPS)과 기상 관련 인공위성(OMI와 MODIS 및 MTSAT-1R 등)으로부터 발췌하여 사용하였다. 그 결과 이 연구 기간(2009년 1월 ~ 2009년 12월)동안 1 km 간격의 수평면에 대하여 계산된 한반도의 지표면 태양광은 안동과 대구 및 진주를 연결하는 지역에서 최대값($5400MJ/m^2$ 이상)이 나타났다. 그러나 지표면 일사 관측 자료의 공간 분포는 이 연구 결과와 차이가 있었으며 그 원인은 관측소 일사계의 보정 및 관리운영에 따른 자료 정확성 결여 때문으로 평가된다.

• Journal of Digital Convergence
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• v.12 no.3
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• pp.243-248
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• 2014

Recently, solar energy is expanding to combination of computing in real time by tracking the position of the sun to estimate the angle of inclination and make up freshly correcting a part of the solar radiation. Solar power is need that reliably linked technology to power generation system renewable energy in order to efficient power production that is difficult to output predict based on the position of the sun rise. In this paper, we analysis of prediction model for solar power generation to estimate the predictive value of solar power generation in the development of real-time weather data. Photovoltaic power generation input the correction factor such as temperature, module characteristics by the solar generator module and the location of the local angle of inclination to analyze the predictive power generation algorithm for the prediction calculation to predict the final generation. In addition, the proposed model in real-time national weather service forecast for medium-term and real-time observations used as input data to perform the short-term prediction models.

• Journal of Broadcast Engineering
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• v.22 no.2
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• pp.207-213
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• 2017

In order to accurately perform multispectral imaging using a multiplexed illumination, intensity of illumination in a scene must be uniform. For image acquisition that requires accurate color information, even if not multispectral imaging, the illumination information must be accurate, and a flat light source or illumination calibration is performed for accurate illumination characteristics. In this paper, we propose a method of color correction to uniformly illuminate an image with non-uniform illumination intensity. The proposed method uses multispectral imaging instead of illumination calibration for color correction. First of all, we perform multispectral imaging with two images obtained from non-uniformity illumination to acquire spectral reflectance. The obtained reflection spectrum is relit as the illumination characteristic of the image obtained from general planar light such as fluorescent light or sunlight. By comparing the image obtained by relighting with the uniformly illuminated image, the non-uniformity of the illumination is confirmed, and the color correction is performed as the image obtained from the uniform image. It is expected that the experimental results will confirm whether the non-uniformity of the illumination is uniformly corrected and reduce the restriction of illumination in obtaining the color information of the image.

• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.415-416
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• 2009

• Korean Journal of Remote Sensing
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• v.26 no.2
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• pp.175-188
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• 2010

A new correction method is required for the Geostationary Ocean Color Imager (GOCI), which is the world's first ocean color observing sensor in geostationary orbit. In this paper we introduce a new method of atmospheric and the Bidirectional Reflectance Distribution Function(BRDF) correction for GOCI. The Spectral Shape Matching Method(SSMM) and the Sun Glint Correction Algorithm(SGCA) were developed for atmospheric correction, and BRDF correction was improved using Inherent Optical Property(IOP) data. Each method was applied to the Sea-Viewing Wide Field-of-view Sensor(SeaWiFS) images obtained in the Korean sea area. More accurate estimates of chlorophyll concentrations could be possible in the turbid coastal waters as well as areas severely affected by aerosols.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.1100-1102
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• 2015

In the study, stereo-based of gamma-ray sources detector for the space including the gamma-ray source to scan in a raster scan method, and obtains a visible light image and the gamma-ray image. We went to retrieve and visualize the distance to source and the direction of the 3-dimension information from Stereo gamma-ray detectors. Configuration of the detector consisted of gamma-ray detecting sensor for gamma-ray Sources, pan-tilt for the scanning of the raster for detecting sources, and CCD camera for visible-light image. Implement a stereo structure of the device to measure the spatial distribution of source, the gamma-ray Detector and CCD camera for the stereo image acquisition was as each configuration 2. The gamma-ray detector and a visible light camera to revision the distribution of detection source, After performing each of the cameras of the stereo correction and shows the distribution of the gamma-ray Sources through 중첩 visible light image and the gamma-ray image. After Rectification process of Left and right image, we were derived visualization results of the stereo image.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.5
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• pp.383-392
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• 2007

This study focuses on co-registration and band selection, which are one of the pre-processing steps to apply the change detection technique using hyperspectral images. We carried out automatic co-registration by using the SIFT algorithm which performance was already established in the computer vision fields, and selected the bands fur change detection by estimating the noise of image through the PIFs reflecting the radiometric consistency. The EM algorithm was also applied to select the band objectively. Hyperion images were used for the proposed techniques, and non-calibrated bands and striping noises contained in Hyperion image were removed. Throughout the results, we could develop the reliable co-registration procedure which coincided with accuracy within 0.2 pixels (RMSE) for change detection, and verified that band selection depending on the visual inspection could be objective by extracting the PIFs.

• Journal of Astronomy and Space Sciences
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• v.9 no.1
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• pp.30-40
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• 1992

The reflection effect on three types of eclipsing binaries has been analyzed based on the Wilson and Devinney's model and Russell and Merrill's model. The reflection effect was displayed on the theoretical light curves for the various conditions using the Wilson and Devinney's light curve program. Two models were compared after the rectifing the theoretical light curves including the reflection effect with the Russell and Merrill's method. The result shows that two models have an agreement on the reflection effect just in cases of the small difference in temperature adn albedo between two stars in the system.

• Korean Journal of Remote Sensing
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• v.27 no.2
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• pp.89-98
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• 2011

Four kinds of gain and offset correction coefficients that are used to correct the nonuniformity between pixels are discussed. And their correction performance has been compared by performing image correction. using the correction coefficients calculated, on the real image data obtained from a newly fabricated camera electronics system. The performance of the correction coefficients depends in general on the number of the light input levels used to obtain the reference image. The result shows that, as expected obviously, when only two light input levles are used to obtain the reference image, even though its correction coefficients are relatively easily calculated, the correction performance is relatively poor. And with the number of light inputs increased to a value of larger than two, the correction performance is improved. It is noted, however, no Significant performance difference is found between the different correction coefficients employed.

• Information and Communications Magazine
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• v.17 no.6
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• pp.100-114
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• 2000

본 논문은 정지궤도위성을 이용한 표준시각/주파수 전송시스템의 동기 오차 요인을 분석하고, 한국과 같이 영토가 작은 국가의 경우, 정지궤도 위성을 이용하는 방식의 이점을 단파 또는 광 전용망을 이용하는 지상망 방식, 그리고 저궤도 위성을 이용하는 GPS방식과 비교 분석한다. 또한, 본 논문은 현재 서비스를 제공 중이거나 연구가 진행중인 단방향 위성 시각 전송 서비스를 고찰하고 특히, 무궁화 위성을 이용한 고정밀도의 표준시각/주파수 전 송서비스를 제공하기 위해 요구되는 동기오차 보정기술에 관하여 연구한다. 국가적 통신망 동기를 위한 표준 시각/주파수의 동기 정확도를 만족시킬 수 있는 효과적인 동기 오차 보정 방식으로 차동(differential mode)보정방식을 제안하고 그 성능을 분석하였으며 시각 정확도 와 주파수 정확도의 관계를 분석하였다. 모의실험 결과, 정상적인 시스템 운영하에서 시각 정확도와 주파수 정확도는 각각 100ns(95%)와 10-11(7일이상) 보다 우수한 것으로 분석되었 으며 본 논문에서 제시한 성능 개선 방안을 적용함으로써 보다 높은 정확도의 시각/주파수 동기가 가능함을 확인하였다.