Ahn Myeong-Hwan

Abstract. The Geostationary Environment Monitoring Spectrometer (GEMS) is the first geostationary earth orbit (GEO) environmental instrument, onboard the Geostationary Korea Multi-Purpose Satellite–2B (GEO-KOMPSAT-2B) launched on 19 February 2020, and is measuring reflected radiance from the earth's surface and atmosphere system in the range of 300–500 nm in the ultraviolet–visible (UV–Vis) region. The radiometric response of a satellite sensor that measures the UV–Vis wavelength region can depe

The <i>Journal of Applied Remote Sensing</i> (JARS) is an online journal that optimizes the communication of concepts, information, and progress within the remote sensing community to improve the societal benefit for monitoring and management of natural disasters, weather forecasting, agricultural and urban land-use planning, environmental quality monitoring, ecological restoration, and numerous other commercial and scientific applications.

Abstract. The Geostationary Environment Monitoring Spectrometer (GEMS) is the first geostationary earth orbit (GEO) environmental instrument, onboard the Geostationary Korea Multi-Purpose Satellite–2B (GEO-KOMPSAT-2B) launched on 19 February 2020, and is measuring reflected radiance from the Earth’s surface and atmosphere system in the range of 300 to 500 nm in the ultraviolet-visible (UV-Vis) region. The radiometric response of a satellite sensor that measures the UV-Vis wavelength region can d

[Purpose] This study investigated the change in functional balance and weight bearing of stroke patients in a set-task balance training program and a selective-task balance training program. [Method] the participants were randomly allocated to either the set-task program or the selective-task program. We evaluated balance capacity using the Berg Balance Scale (BBS). Postural weight bearing was measured using a Tetrax Intractive Balance System, and the lower extremity function was evaluated using

The Total Carbon Column Observing Network (TCCON) utilizes Fourier Transform Spectrometers (FTS) to provide the atmospheric column-average concentrations of greenhouse gases. While the retrieval process scales a priori gas profiles as input parameters, the FTS data itself enables the derivation of vertical profiles for these gases. This study focused on deriving and validating the vertical profile of carbon dioxide (CO2) from FTS measurements at TCCON’s Anmyeondo observation site. Accurate CO2 p

This study derived the vertical profile of methane (CH4) concentrations using Fourier Transform Spectrometer (FTS) measurements from the Anmyeondo site, and validated with ground-based and airborne measurements. The a priori methane profiles currently employed by the Total Carbon Column Observing Network (TCCON) were found to inadequately represent local emissions, exhibiting weak diurnal variations, especially within the boundary layer. In contrast, methane profiles simulated by the Goddard Ear

Currently, Korea is developing a Cheollian follow-on satellite program, named asGeostationary Korea Multipurpose Satellite 2 (GK-2), which consists of two satellites. One satellite(GK-2A) is dedicated to the meterological mission, while the second one (GK-2B) hosts twomain payloads for the ocean and environmental application. As GK-2A is dedicated to the meteorologicalmission unlike Cheollian, there have been discussions on the possibility of transferringthe responsibilities of the GK-2A program

Atmospheric aerosols interact with sunlight and affect the global radiation balance that can cause climate change through direct and indirect radiative forcing. Because of the spatial and temporal uncertainty of aerosols in atmosphere, aerosol characteristics are not considered through GCMs (General Circulation Model). Therefor it is important physical and optical characteristics should be evaluated to assess climate change and radiative effect by atmospheric aerosols. In this study GMS-5 satell

Remote sensing becomes a new and core framework for the atmospheric sciences andclosely related areas concerning with the ever-changing global environmental status. However,remote sensing in the Korea Meteorological Society is relatively new, where the first relevantpaper is appeared in 1983, as well as is an area with relatively limited number of research groups. Here, we review and summarize some of the key progress in this area within Korea MeteorologicalSociety focusing on the areas of satel

SAR 이미지의 통계적 특징을 이용하여 유류오염영역을 특정하는 방법은 분류규칙이 복잡하고 이상값에 의한 영향을 많이 받는다는 한계가 있어, 최근 인공신경망을 기반으로 유류오염영역을 특정하는 연구가 활발히 이루어지고 있다. 하지만, 다양한 유류오염 사례에 대해 모델의 탐지 성능 및 특성을 평가한 연구는 부족하였다. 따라서, 본 연구에서는 기본적인 구조의 CNN인 Simple CNN과 픽셀 단위의 영상 분할이 가능한 U-net 을 이용하여, CNN의 구조와, 유류오염의 분포특성에 따른 모델의 탐지성능차이가 존재하는지 분석하였다. 연구결과, 축소경로만 존재하는Simple CNN과 축소경로와 확장경로가 모두 존재하는U-net의 F1 score는 86.24% 와 91.44%로 나타나, 두 모델 모두 비교적 높은 탐지 정확도를 보여주었지만, U-net의 탐지성능이 더 높은 것으로 나타났다. 또한 다양한 유류오염 사례에 따른 모델의 성능 비교를 위해, 유류오염의 공간적 분포특성(유류오염 주변의

Recently released a top secret document explicitly shows that the early development plan for an earth observation satellite in the USA has a hidden and more important purpose for a concept of 'free space' than the scientific purpose. At that time, the hidden and secret concept imbedded within the early space development plan prevail other national policies of the USA government for purpose of the national security. Under these circumstances, it is quite reasonable to accept a possibility that th

The Korea’s Geostationary Multi-Purpose Satellite-2A (GK2A) was launched in December 2018 with its main payload, Advanced Meteorological Imager (AMI). Using the 9 infrared channels of the AMI, an algorithm has been developed to retrieve vertical profiles of temperature and humidity for the clear-sky. The algorithm, named as AMI Atmospheric Profile (AAP), is based on an optimal estimation method with its a priori information from model forecasts. From the retrieved profiles, total precipitable wa

세계 최초 능동형 라이더 센서 Atmospheric Laser Doppler Instrument (ALADIN)의 바람 자료와 한국형수치예보모델에 바람 자료로 활용되고 있는 Geostationary Korea Multi Purpose Satellite 2A (GK2A)의 대기운동 벡터의 자료를 비교함으로써 두 위성의 바람 자료의 특징을 분석하였다. 2019년 9월부터 20220년 8월 1년의 자료를 ALADIN의 미(Mie)채널과 GK2A 적외채널에 대하여 비교한 결과 수집된 자료는 177,681개이며 평균 제곱근 오차(Root Mean Square Error; RMSE)는 3.73 m/s, 상관계수는 0.98이다. 상세한 분석을 위해 위도와 고도를 고려하여 비교한 결과, 대부분의 위도에서 표준화된 평균 제곱근 오차(Normalized Root Mean Squared Error; NRMSE)가 0.2~0.3으로 두 바람 자료가 일치하지만 상층, 중층의 경우 저위도지역에서, 하층의 경

This special issue of APJAS contains nine papers of retrieval algorithms for Geo-KOMPSAT 2A (GK2A) meteorological products. K. Park et al. and J. Jee et al. present the development of the sea surface temperature and current vectors, and the aerosol detection retrieval algorithms for geostationary satellite data, respectively. M. Ahn et al. and K. Han et al. present the evaluation of atmospheric profile retrieval algorithm and NDVI estimation for GK2A satellite, respectively. K. Han et al. docume