• 자원환경지질
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• 제24권3호
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• pp.319-327
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• 1991

제주도(濟州島)는 화산암(火山岩)과 화산쇄설오퇴적층으로 형성(形成)된 한반도(韓半島)에서 가장 큰 섬이다. 지형(地形)은 저지대(低地帶)로 현무암(玄武岩)이 넓게 분포(分布)하며 섬 중앙(中央)에는 1950m의 화산(火山)이 우뚝 솟아 있으며 정상에는 화산분출(火山噴出)에 의(依)해 형성(形成)된 화구(火口)가 존재(存在)한다. 지표수(地表水)의 유출(流出)은 대단히 빈약하여 용수이용(用水利用)은 지하수(地下水)와 용출수(湧出水)에 거의 의존(依存)한다. 본(本) 도(島)에는 약(約) 1650여개소의 지하수개발공(地下水開發孔)이 있는데 대부분 $1,000{\sim}2,000m^3/day$의 산출(産出)이 가능(可能)하다. 근래에 와서 지하수이용증대(地下水利用增大)에 따라 해안(海岸) 인접지역 특(特)히 동부지역중(東部地域中) 일부(一部)에서는 해수침입현상(海水侵入現象)이 일어나고 있다. 이 지역(地域)의 지형(地形)은 아주 평저하고 지하수위(地下水位)도 해수면(海水面)가까이에 위치(位置)하여 지하수의 과잉 양수(揚水)는 결국 해안(海岸)으로부터 최고(最高) 6km 내륙까지 해수침입(海水侵入)을 초래하게 되었다. 이러한 문제를 해결하기 위(爲)하여서는 장기(長期) 수리화학적(水理化學的)인 감시체계망 설치가 무엇보다도 필요(必要)하다.

• 대기
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• 제34권3호
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• pp.283-304
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• 2024

This study analyzed the variability and correlation between ground-level air pollutant concentrations and the atmospheric mixing layer height using data from four types of air pollutants (PM_2.5, PM₁₀, NO₂, and O₃) collected at AirKorea monitoring stations nationwide over a five-year period (2018~2022), and aerosol backscatter data observed by the Vaisala CL31 to derive atmospheric mixing layer heights. The five-year trends and variability of ground-level air pollutant concentrations under seasonal and hourly conditions were examined, as well as the seasonal distribution and diurnal variation of the atmospheric mixing layer height. Five correlation coefficient methodologies were applied to analyze the correlations between ground-level air pollutants and atmospheric mixing layer height under various seasonal and hourly conditions, confirming the dilution effect of the atmospheric mixing layer height. The results showed that PM_2.5, PM₁₀, and NO₂ generally had negative correlations with the atmospheric mixing layer height, while O₃ showed a strong positive correlation up to an altitude of 1,200~1,500 meters, and a negative correlation beyond that altitude. It was also shown that a single high concentration event (e.g., PM₁₀) can alter the overall correlation. The correlation can also vary depending on the characteristics of the correlation coefficient methodology, highlighting the importance of applying the appropriate methodology for each case during the analysis process.

• 한국입자에어로졸학회지
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• 제9권4호
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• pp.253-260
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• 2013

For a vertical atmospheric aerosol distribution measurement, a very compact and light particle sampling package is developed. This package includes a compact optical particle counter (Hy-OPC), a light and small condensation particle counter (Hy-CPC), sensors (GPS, wind velocity, temperature, humidity), and a communication and system control board. This package is attached to He balloon and the altitude is controlled by a winch. Using this system the vertical particle size distribution was measured. The test results showed that the ground base atmospheric particle measurement result may be a lot different from that high above the ground.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.649-652
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• 2005

In this paper we present a detail approach of the determination of IFOV (Instantaneous Field of View) of high-resolution (l m) panchromatic satellite image over test site. IFOV is the representative measurements as the determination of the spatial resolution in remote sensed imaging system. It can be defined as some area on the ground with the particular altitude when the satellite acquires the image at any given time. Especially, spatial resolution of passive sensors primarily depends on their IFOV. The determination of IFOV goes through simple steps of procedure as followings: Firstly, the GSD (Ground Sample Distance) should be computed at each point on the geometrically corrected image. Then, The GSD is converted into the IFOV. So we are going to explain our test procedures and results.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.101-101
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• 2000

MSC(Multispectral Camera), which will be a unique payload on KOMPSAT-II, is designed to collect panchromatic and multi-spectral imagery with a ground sample distance of 1m and a swath width of 15km at 685km altitude in sun-synchronous orbit. The instrument is designed to have an orbit operation duty cycle of 20% over the mission life time of 3 years. MSC electronics consists of three main subsystems; PMU(Payload Management Unit), CEU(Camera Electronics Unit) and PDTS(Payload Data Transmission Subsystem). PMU performs all the interface between spacecraft and MSC, and manages all the other subsystems by sending commands to them and receiving telemetry from them with software protocol through RS-422 interface. CEU controls FPA(Focal Plane Assembly) which contains TDI(Timc Delay Integration) CCD(Charge Coupled Device) and its clock drivers. PMU provides a Master Clock to synchronize panchromatic and multispectral camera. PDTS performs compression, storage and encryption of image data and transmits them to the ground station through x-band.

• 한국군사과학기술학회지
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• 제13권6호
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• pp.1172-1179
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• 2010

Since HEMP has the very short rising time and propagates widespreadly with several tens of kV/m, it threatens most of systems in its cover range. Therefore, it is important to research coupling mechanism into systems and establish countermeasures for the HEMP to protect systems effectively. This paper analyzed characteristics and trends of currents to be induced at the load of a line which is located over ground with different conditions such as polarization, incidence angle, line length and height etc. We applied double exponential waveform as the HEMP shape and used BLT method to analyze the coupling route into the line. Also, we compared the simulation data of chain matrix modeling to verify reliability of BLT modeling. In the result, two data is almost agreed.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1052-1054
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• 2003

RAZAKSAT is a second micro-satellite mission by Malaysian Satellite Program and is expected for launch in June 2004. Designed to orbit the earth at low-equatorial orbit, RAZAKSAT will meet Malaysia’s immediate needs to rapid data acquisition (real time and more repetitions) to address many operational issues of remote sensing applications, which require availability of current data sets. RAZAKSAT will be among the first remote sensing satellite to orbit the earth at low inclination along the equator, 9$^{\circ}$ with 685km altitude, hence, allows optimal geographical information and environment change within equatorial region be observed with a unique revisit characteristics. The satellite primary payload is MAC, a push-broom type camera with 2.5m of ground sampling distance (GSD) in panchromatic band and 5m of GSD in four multi-spectral bands. This paper describes on the variation of illumination anticipated from simulated RAZAKSAT image, examine its implication to its ground leaving radiances for major applications.

• 항공우주시스템공학회지
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• 제3권4호
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• pp.35-40
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• 2009

The first purpose of this study is to develop a GCS(Ground Control System) by using RF(Radio Frequency) wireless communication equipments for UAV(Unmanned Aerial Vehicle). The second goal is to develop an antenna tracking system operating automatically. UAV receives flight data from a RF wireless system. So the role of antenna tracking system is very important to keep good communication state between UAV and GCS. GCS can check flight data and display a aviation state of UAV in real-time. The flight data displayed in real-time by GCS include the latitude, longitude, altitude, speed and so on. Experiments that measure a communication range and reliability are needed to develop a RF wireless communication system.

• 한국광학회지
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• 제12권5호
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• pp.382-388
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• 2001

1999년 5월 26일 발사되었던 우리별 3호 인공위성에는 지구관측 전자광학 카메라가 탐재되어 있다. MEIS는 직경 95 mm Mangin 망원경으로 고도 720 km에서 13.8 m의 지상화소로 48km의 폭을 3개의 서로 다른 광 대역에서 관측한다. 본 논문에서는 우리별 3호 카메라의 설계와 제작/조립 및 시험결과를 비교 분석하고, 발사후의 운영에 관련된 문제점을 논하였다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2021년도 추계학술대회
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• pp.180-182
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• 2021

본 논문에서는 드론의 비행 장소와 온도 및 습도에 영향을 받지 않는 적외선 기반 깊이 카메라로부터 얻어진 깊이영상을 분석하여 지면 영역을 찾고 AGL(Above Ground Level) 단위의 고도를 측정하는 방법을 제안한다. Decimation filter 와 Median filter 를 적용하여 잡음 및 빈 데이터들을 제거한 깊이영상으로부터 RANSAC (RANdom Sample Consensus) 기반 평면 모델 추정 방법을 이용하여 지면 영역과 이에 대한 평면의 방정식을 유추하고 현재 위치와의 거리를 계산한다. 성능 평가를 위해 Lidar 센서와 비교한 결과, 제안 방법이 지면에 위치한 장애물에 영향을 더 적게 받으며, 자세 정보와 독립적으로 고도를 측정할 수 있었다.