• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.142-145
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• 2007

In order to analyze hyper-spectral properties of Sand and Dust Storm (SDS), dust observation experiment has been performed at the Korea Global Atmosphere Watch Center (KGAW) in Anmyeon form early March to middle of May, 2007. We measured down-welling radiances by using ground-based Fourier Transform Infrared Spectroscopy (FT-IR) at the time of overpass of AIRS. And radiative transfer model simulation has been carried out to estimate the effects of size distribution, components, and altitude of SDS over the high resolution infrared spectrum in the range of 500-1500 $cm^{-1}$ with a line-by-line radiative transfer model and compared them with FT-IR and AIRS/Aqua observing data.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.149-152
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• 2007

The detection of yellow sand dust using satellite has been utilized from various bands from ultraviolet to infrared channels. Among them, Infrared channels have an advantage of detecting aerosols over high reflecting surface as well as during nighttime. Especially, brightness temperature difference between 11 and 12{\mu}m(BTD) was often used to distinguish between water cloud and yellow sand, because Ice and liquid water particles preferentially absorb longer wavelengths while aerosol particles preferentially absorb shorter wavelengths. We have found that the BTD significantly depends on surface temperature, emissivity, and zenith angle and thereby the threshold of BTD. In order to overcome these problems, we have constructed the background brightness temperature threshold of BTD and then subtracted it from BTD. Along with this, we utilized high temporal coverage of geostationary satellite, MTSAT-1R, to verify the reliability of the retrieved signal in conjunction with forecasted wind information. The statistical score test illustrated that this newly developed algorithm showed a promising result for detecting mineral dust by reducing the errors in the current BTD method.

• 센서학회지
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• 제14권5호
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• pp.337-342
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• 2005

A silicon-based micro-reactor to amplify small amount of deoxyribonucleic acid (DNA) has been fabricated using micro-electro-mechanical systems (MEMS) technology. Polymerase chain reaction (PCR) of DNA requires a precise and rapid temperature control. A Pt sensor is integrated directly in the chamber for real-time temperature measurement and an infrared lamp is used as external heating source for non-contact and rapid heating. In addition to the real-time temperature sensing, PCR needs a rapid thermocycling for effective PCR. For a fast thermal response, the thermal mass of the reactor chamber is minimized by removal of bulk silicon volume around the reactor using double-side KOH etching. The transparent optical property of silicon in the infrared wavelength range provides an efficient absorption of thermal energy into the reacting sample without being absorbed by silicon reactor chamber. It is confirmed that the fabricated micro-reactor could be heated up in less than 30 sec to the denaturation temperature by the external infrared lamp and cooled down in 30 sec to the annealing temperature by passive cooling.

• 한국태양에너지학회 논문집
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• 제33권5호
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• pp.51-59
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• 2013

It is usual to evaluate the performance of the cool roof by measuring in-site rooftop temperature using thermal infra-red camera. The principal advantage of rooftop thermal infrared image acquired in oblique vantage point of super high-rise building as a remote sensor is to provide, in a cost-effective manner, area-wide information required for a scattered rooftop target with different colors, utilizing wide view angle and multi-temporal data coverage. This research idea was formulated by incorporating the concept of traditional remote sensing into rooftop temperature monitoring. Correlations between infrared image of super high-rise building and in-situ data were investigated to compare rooftop surface temperature for a total of four different rooftop locations. The results of the correlations analyses indicate that the rooftop surface temperature by the infrared images of super high-rise building alone could be explained yielding $R^2$ values of 0.951. The visible permanent record of the oblique thermal infra-red image was quite useful in better understanding the nature and extent of rooftop color that occurs in sampling points. This thermal infrared image acquired in oblique vantage point of super high-rise made it possible to identify area wide patterns of rooftop temperature change subject to many different colors, which cannot be acquired by traditional in-site field sampling. The infrared image of super high-rise building breaks down the usual concept of field sampling established as a conventional cool roof performance evaluation technique.

• 대한원격탐사학회지
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• 제33권6_3호
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• pp.1179-1185
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• 2017

KOMPSAT-3A 위성은 기존의 지구관측 위성에 비하여 고해상도의 MWIR 영상을 하루 2번 취득한다. 기존 SWIR 영상이나 TIR 영상과 다른 특성으로 인하여 새로운 지표면 방사 정보를 제공할 수 있다. 본 연구에서는 KOMPSAT-3A MWIR 위성영상의 특성을 살펴보기 위하여 다시기 차이 영상을 생성하여 기존 적외 영상과 비교하였다. IR 영상의 전처리 과정으로 영상 상대보정을 수행하고, PIFs(Pseudo Invariant Features) 화소기반의 상대방사 보정을 수행하여 화소값의 차이를 최소화시켰다. Sentinel-2 SWIR 영상, Landsat 8 TIR 영상과 KOMPSAT-3A MWIR 영상을 실험한 결과, KOMPSAT-3A 차이 영상에서 인공지물의 구별이 두드러짐을 확인할 수 있었다. 이러한 IR영상의 특성을 이용하여 향후 KOMPSAT-3A MWIR 영상의 활용도를 높일 수 있을 것으로 여겨진다.

• 대한원격탐사학회지
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• 제30권4호
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• pp.465-480
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• 2014

본 연구에서는 최근 발생한 집중호우 사례들 중 예보가 어려워 피해가 컸던 두 사례(2010년 9월 21일, 2011년 8월 9일)에 대해 적외영상과 수증기영상의 시 공간적인 변화 특성을 분석하였다. 두 사례에서 한반도지역에 집중호우를 유발한 대류 세포들은 적외영상에서 하층운이 광범위하게 분포하고 수증기 영상에서는 명역과 암역의 경계(boundary)에서 생성되는 특징을 보였다. 또한 대류 세포들의 이동속도 차에 의한 총 5번의 병합과정 중 4번의 병합과정에서 대류 세포들의 병합 후 대류 세포는 더욱 발달되었으며 강수 강도도 급격하게 강화되었다. 대류시스템에서의 강우강도 변화는 휘도온도의 평균보다 최소 휘도온도의 시간적 변화와 밀접하게 관련된 것으로 판단되며 대류 세포들의 병합도 집중호우의 강도 변화에 영향을 주는 주요 인자로 생각된다. 대류 세포들의 병합은 영상동화를 통해 어느 정도 예측이 가능하지만 대류 세포의 탐지는 적외 및 수증기 영상 모두에서 일정 강도 이상 발달한 상태에서만 탐지가 가능하였다.

• 대한공간정보학회지
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• 제1권2호
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• pp.185-194
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• 1993

원격탐측은 초기에는 자연현상이나 지표대상물의 개략적인 분포와 변화를 추출하는데 사용되어 왔으나 최근에는 식물의 분광특성을 이용한 농업조사, 산림조사나 지하자원탐사, 해양상의 수온 및 해류분포조사, 기상조사 등 많은 분야에 응용되고 있다. 본 연구에서는 이와 같은 원격탐측의 많은 응용분야 중에서 해양으로 배출되는 공장온배수의 확산범위를 조사하기 위하여 지구자원 탐사위성인 LANDSAT-5호에 탑재되어 있는 TM에 의해 얻어진 영상과 지상탐측기인 열적외주사기 Thermo Tracer에 의해 얻어진 열적외 영상을 이용하였다. LANDSAT TM영상의 Band 6은 열적외 Band로서 NASA의 CSFC에서 제공한 변환식 및 사후검정값을 이용하여 Band 6의 gray level값으로부터 해수온도 분포를 추출하였으며, Thermo Tracer의 열적외 영상은 TH1100 Series의 Processing mode를 이용하여 온도분포를 얻었다. 이와 같은 영상을 분석한 결과 근해의 수심이 얕은 지역의 해수온도는 담수온도와 내륙온도의 영향을 크게 받고 있음을 알 수 있었으며, 온배수의 확산범위 및 면적을 시각적 및 정량적으로 나타낼 수 있었다. 또한 열적외선 주사영상을 이용하여 보다 세부적인 확산범위를 제시할 수 있었으며 LANDSAT영상결과와 거의 동일한 결과를 나타냄을 알 수 있다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.382-386
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• 1998

The objectives of this study are to reveal relationship between tree physiology and spectral reflectance on effects of artificial acid rain and to obtain basic data on optimal wave length for forest of LRC sensor on KOMPSAT-2. Three pH levels of artificial acid rain - control, pH4.5 and pH3.0 - were applied to Pinus and Quercus species. Three types of the acid rain were spraied at the amount of 500m1 in every two days. Spectral reflectance data was collected once in a month by using GER 1500 (350~2500nm) or Ll 1800(300~1100nm) Spectroradiometer. The data was measured three times in a pH level. The results of this study are as follows; in April, the spectral reflectance of Pinus species was high in order at the level of pH3.0, control and pH4.5; in May, control, pH3.0 and pH4.5; in June, control, pH4.5 and pH3.0. That of Quercus species was high in the order of control, pH4.5 and pH3.0 in May; in June, control, pH3.0 and pH4.5, especially, within infrared wave length range, control, pH4.5 and ph3.0.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.72-74
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• 2003

Forest canopy density is an ideal representative of the forest habitat situations. It can directly or indirectly depict the canopy structure and gap size in the forestland, thus could be applied to assessment of wildlife’s diversit y. Since population survey of vegetation and wildlife diversities is a key issue for sustainable forest ecosystem management, many research efforts have been focused on forest canopy density using multispectral data in the last two decades. Unfortunately, prediction of canopy density using large scaling remote sensing data remains a challenging issue. Due to recent advances in hyperspectral image sensors hyperspectral imagery is now available for environmental monitoring. In this paper, we conduct experiments to monitor complicated environments of forestland that can be captured by using hyperspectral imagery and further be analyzed to test a prediction model of forest canopy density. The results show that 95% of canopy density could be well described by using 2 difference vegetation indices (DVIs), which are difference of blue and green reflectances rband_100-rband_150 and difference of 2 short wave infrared reflectancse rband_406-rband_410 With the wavelengths of band no. 100, 150, 406, and 410 specified by 462.39 nm, 534.40 nm, 918.22 nm and 924.41 nm respectively.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2000년도 춘계 학술대회 논문집 통권 3호 Proceedings of the 2000 KSRS Spring Meeting
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• pp.49-54
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• 2000

Conventional methods for measuring winds provide wind velocity observations over limited area and time period. The use of satellite imagery for measuring wind velocity overcomes some of these limitations by providing wide area and near condinuous coverage. And its accurate depiction is essential for operational weather forecasting and for initialization of NWP models. GMS-5 provides full disk images at hourly intervals. At four times each day - 0500, 1100, 1700, 2300 hours UTC-a series of three images is received, separated by thirty minutes, centered at the four times. The current wind system generates winds from sets of 3 infrared(IR) images, separated by an hour, four times a day. It also produces visible(VIS) and water vapor(WV) image-based winds from half-hourly imagery four times a day. The derivation of wind from satellite imagery involves the identification of suitable cloud targets. tracking the targets on sequential images, associating a pressure height with the derived wind vector, and quality control. The aim of this research is to incorporate imagery from other available spectral channels and examine the error characteristics of winds derived from these images.