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최지녕,최연주,정수민,정애라,김민빈,김지은,김석환,김예원,이직,임희진,민경욱,나고운,남지우,박일흥,서정은,Choi, Ji Nyeong,Choi, Yeon Ju,Jeong, Soomin,Jung, Aera,Kim, Min Bin,Kim, Ji Eun,Kim, Sug-Whan,Kim, Ye Won,Lee, Jik,Lim, Heuijin,Min, Kyung Wo 한국천문학회 2012 天文學會報 Vol.37 No.2
UFFO Burst Alert & Trigger telescope (UBAT) is one of major instruments of UFFO-Pathfinder. The UBAT aims at 10 arcmin resolution localization of Gamma Ray Bursts with X-ray coded mask technique. It has $400mm{\times}400mm$ coded mask aperture, hopper, shielding and detector module with effective area of $191cm^2$. The detector module consists of an assembly of 36 64-ch MAPMTs and $25mm{\times}25mm$ pixellated YSO crystal array, and associated analog and digital electronics of about 2500 channels. We performed a vibration test using a dummy MAPMT with the detector module structure to measure the indused stress applied onto the MAPMT. We designed a sub-structure on the detector module to avoid the resonance that would otherwise deforms the detector module structure. A finite element analysis confirms the reduction of the load acceleration down to 12g. The experimental results are to be reported. Consequently, it proves that the MAPMT arrays of the flight UBAT detector module structure would survive in the space launch environment.
지상 및 고도별 대기측정 자료 융합을 이용한 반도형 해안지역의 직달일사량 계절 변화 연구
최지녕,이상희,성세현,안기범,김석환,김진호,박상현,장석원 대한원격탐사학회 2020 大韓遠隔探査學會誌 Vol.36 No.3
Localized solar irradiance is normally derived from atmospheric transmission influenced by atmospheric composition and conditions of the target area. Specially, for the area with complex coastal lines such as Taean gun, the accurate estimation of solar irradiance requires for in depth analysis of atmospheric transmission characteristics based on the localized vertical profiles of the key atmospheric parameters. Using MODTRAN (MODerate resolution atmospheric TRANsmission) 6, we report a computational study on clear day atmospheric transmission and direct solar irradiance estimation of Taean gun using the data collected from 3 ground stations and radiosonde measurement over 93 clear days in 2018. The MODTRAN estimated direct solar irradiance is compared with the measurement. The results show that the normalized residual mean (NRM) is 0.28 for the temperature based MODTRAN atmospheric model and 0.32 for the pressure based MODTRAN atmospheric model. These values are larger than 0.1~0.2 of the other study and we understand that such difference represents the local atmospheric characteristics of Taean gun. The results also show that NRM tends to increase noticeably in summer as the temperature increases. Such findings from this study can be very useful for estimation and prediction of the atmospheric condition of the local area with complex coastal lines. 태양 일사량은 관측 지역의 대기 조성 및 기상에 따른 대기 투과율의 영향을 고려하여 계산된다. 특히, 태안 지역과 같은 복잡한 해안 특성을 가진 지역에서의 일사량 계산의 정확도를 높이기 위해서 국소 지역에대한 연직 기상 환경 자료를 통해 대기의 지역적 특성을 파악하고 이를 바탕으로 한 대기투과율을 계산할 수있어야 한다. 본 연구에서는 한반도 태안반도에 위치한 3개 지상관측소 및 라디오존데의 2018년도 기상 자료를 이용하여 청명일에 대한 대기투과율 및 직달일사량을 MODTRAN (MODerate-resolution atmospheric TRANsmission) 6를 이용하여 수치모사하였다. MODTRAN 6로 계산된 직달일사량 추정 값은 일사계의 실제관측 값과의 비교 연구를 수행한 결과, 일사량의 규격화 잔차 평균(Normalized Residual Mean)은 기온에 의한 대기표준모델을 적용한 경우 0.28, 기압의 경우 0.32로 나타나서 타 연구의 0.1~0.2에 비해 높게 나왔으며, 이는 지역적 대기 특성의 차이에 기인한 것으로 이해된다. 또한 기온이 높아지는 여름철로 갈수록 일사량 규격화 잔차평균이 커지는 경향을 확인할 수 있었다. 이를 통해 태안 지역과 같은 복잡한 해안 특성을 지닌 지역에서의 대기 모델 개선 가능성을 제시하였다.
국지적 일사량 산출 정확도 향상을 위한 다중회귀 증강 알고리즘
최지녕 ( Ji Nyeong Choi ),이상희 ( Sanghee Lee ),안기범 ( Ki-beom Ahn ),김석환 ( Sug-whan Kim ),김진호 ( Jinho Kim ) 대한원격탐사학회 2020 大韓遠隔探査學會誌 Vol.36 No.6
국지 지역에 대한 기상변수의 계절적인 변화는 해당 지역의 대기 투과 특성에 크게 영향을 미친다. 본 연구에서는 대기 환경의 국지적 특성이 매우 큰 지역에 대한 대기투과율과 일사량의 정밀 결정을 위해 새로운 다중회귀 증강 알고리즘을 제안한다. 이 방법은 1) 관측된 기상자료를 사용하는 적응형 대기모델 선정 및 2) 통상적인MODTRAN의 대기투과율 계산에 추가하여 다중선형회귀모델을 사용한다. 2018년 청명일에 해당하는 태안 연안의 기상자료에 이 새로운 알고리즘을 적용하여 계산된 일사량을 관측자료와 비교하였다. 측정과 계산 사이의 일사량 차이가 89.27 ± 48.08σ W/m2 (표준 MODTRAN 계산)에서 21.35 ± 16.54σ W/m2 (증강 다중회귀 알고리즘)로 약 70% 이상 개선되었다. 본 연구에서 제안한 이 새로운 방법론은 대기 환경 조건의 변화가 심해 국지적 특성이 매우 큰 지역의 일사량 및 대기 투과 특성을 정확하게 추정하고 이러한 지역에 대한 원격 탐사 자료의 대기 보정 작업에서 유용한 도구가 될 수 있을 것이다. The seasonal variations in weather parameters can significantly affect the atmospheric transmission characteristics. Herein, we propose a novel augmented multiple regression algorithm for the accurate estimation of atmospheric transmittance and solar irradiance over highly localized areas. The algorithm employs 1) adaptive atmospheric model selection using measured meteorological data and 2) multiple linear regression computation augmented with the conventional application of MODerate resolution atmospheric TRANsmission (MODTRAN). In this study, the proposed algorithm was employed to estimate the solar irradiance over Taean coastal area using the 2018 clear days’ meteorological data of the area, and the results were compared with the measurement data. The difference between the measured and computed solar irradiance significantly improved from 89.27 ± 48.08σ W/m2 (with standard MODTRAN) to 21.35 ± 16.54σ W/m2 (with augmented multiple regression algorithm). The novel method proposed herein can be a useful tool for the accurate estimation of solar irradiance and atmospheric transmission characteristics of highly localized areas with various weather conditions; it can also be used to correct remotely sensed atmospheric data of such areas.
The Burst Alert and Trigger Telescope for the Ultra Fast Flash Observatory Pathfinder
나고운,최지녕,최연주,정수민,정애라,김지은,김민빈,김석환,김예원,이직,임희진,민경욱,박일흥,서정은,Na, Go Woon,Choi, Ji Nyeong,Choi, Yeon Ju,Jeong, Soomin,Jung, Aera,Kim, Ji Eun,Kim, Min Bin,Kim, Sug-Whan,Kim, Ye Won,Lee, Jik,Lim, Heuijin,Min, 한국천문학회 2012 天文學會報 Vol.37 No.2
The Ultra Fast Flash Observatory (UFFO) pathfinder is a payload system on-board the Russian satellite Lomonosov, scheduled to be launched in 2013. The main purpose of the UFFO pathfinder is to observe the early photons from Gamma-Ray Bursts. It consists of two instruments. The first instrument is the UFFO Burst Alert X-ray Trigger telescope (UBAT) for the fast-trigger and detection of GRB location, and the second is the Slewing Mirror Telescope (SMT) for the observation of the UV/optical afterglow from the GRB located by the UBAT. It will provide the first-ever systematic study of UV/optical emission far earlier than 1 sec after trigger. We will present the design, fabrication and the preliminary performance of the UBAT.
The Slewing Mirror Telescope of the Ultra Fast Flash Observatory Pathfinder
정수민,최지녕,정애라,김민빈,김석환,김예원,김지은,이직,임희진,나고운,남지우,박일흥,서정은,Jeong, Soomin,Choi, Ji Nyeong,Jung, Aera,Kim, Min Bin,Kim, Sug-Whan,Kim, Ye Won,Kim, Jieun,Lee, Jik,Lim, Heuijin,Na, Go Woon,Nam, Jiwoo,Park, Il Hung 한국천문학회 2012 天文學會報 Vol.37 No.2
The Slewing Mirror Telescope (SMT) is a key telescope of Ultra-Fast Flash Observatory (UFFO) space project to explore the first sub-minute or sub-seconds early photons from the Gamma Ray Bursts (GRBs) afterglows. The first realization of UFFO is the 20kg UFFO-Pathfinder (UFFO-P) to be launched on board the Russian Lomonosov satellite in 2013 by the Soyuz-2 rocket. Once the UFFO Burst Alert & Trigger Telescope (UBAT) detects the GRBs, Slewing mirror (SM) will rotate to bring the GRB into the SMT's field of view instead of slewing the entire spacecraft. SMT can image the UV/Optical counterpart with about 4-arcsec accuracy. However it will provide a important understanding of the GRB mechanism by measuring the sub-minute optical photons from GRBs. SMT can respond to the trigger over $35^{\circ}{\times}35^{\circ}$ wide field of view within 1 sec by using Slewing Mirror Stage (SMS). SMT has 10-cm Ritchey-Chretien telescope and $256{\times}256$ pixilated Intensified Charge-Coupled Device (ICCD) on focal plane. In this paper, we discuss the overall design of UFFO-P SMT instrument and payloads development status.
The Electronics system of the Ultra Fast Flash Observatory Pathfinder
김지은,최지녕,최연주,정수민,정애라,김민빈,김석환,김예원,이직,임희진,민경욱,나고운,박일흥,서정은,Kim, Ji Eun,Choi, Ji Nyeong,Choi, Yeon Ju,Jeong, Soomin,Jung, Aera,Kim, Min Bin,Kim, Sug-Whan,Kim, Ye Won,Lee, Jik,Lim, Heuijin,Min, Kyung Wook,N 한국천문학회 2012 天文學會報 Vol.37 No.2
The Ultra Fast Flash Observatory (UFFO) pathfinder consists of the UFFO Burst Alert X-ray Trigger telescope (UBAT) and the Slewing Mirror Telescope (SMT). They are controlled by the UFFO Data Acquisition system (UDAQ). The UBAT triggers Gamma-Ray Bursts(GRBs) and sends the position information to the SMT. The SMT slews the motorized mirror rapidly to the GRB position to take the UV/Optical data within a second after trigger. The UDAQ controls each instrument, communicates with the satellite, collects the data from UBAT and SMT, and transfers them to the satellite. Each instrument uses its own field programmable gates arrays (FPGA) for low power consumption and fast processing, and all functions are implemented in FPGAs without using microprocessors. The entire electronics system of the UFFO pathfinder including architecture, control, and data flow will be presented.
Design and Construction of Detector Module for UFFO Burst Alert & Trigger Telescope
정애라,최지녕,최연주,정수민,김지은,김민빈,김석환,김예원,이직,임희진,민경욱,나고운,남지우,박일흥,Jung, Aera,Ahmad, Salleh,Barrillon, Pierre,Brandt, Soren,Budtz-Jorgensen, Carl,Castro-Tirado, Alberto J.,Chen, Pisin,Choi, Ji Nyeong,Choi, Yeon J 한국천문학회 2012 天文學會報 Vol.37 No.2
One of the key aspects of the upcoming Ultra-Fast Observatory (UFFO) Pathfinder for Gamma-Ray Bursts(GRBs) identification will be the UFFO Burst Alert & Trigger Telescope(UBAT), based on a novel space telescope technique. The UBAT consists of coded mask, hopper, and detector module(DM). The UBAT DM consists of YSO crystal arrays, multi-anode photo mulipliers, and readout electronics. We will present the design and construction of the UBAT DM, and the response of the UBAT DM to X-ray sources.
문다영,김유정,민지현,박건민,성우진,이다현,최지녕 경북대학교 간호혁신연구소 2024 경북간호과학지 Vol.28 No.1
Purpose: The purpose of this study was to identify the factors affecting the interpersonal relationship competency among nursing students who have experienced COVID-19. Methods: The participants in this study were 160 nursing students in South Korea. Data was collected from July 11 to July 18, 2023 using an online questionnaire. The questionnaire included general characteristics, type of characteristics, social self-efficacy, appearance satisfaction, depression, and interpersonal relationship competency. The results were analyzed with SPSS/Win 25.0 program using descriptive analysis, t-test, ANOVA, Scheffé test, Pearson’s correlation coefficients, and multiple regression analysis. Results: The interpersonal relationship competency was significantly correlated with experience of dating relationship, social self-efficacy, depression. Factors that affect the interpersonal relationship competency were experience of dating relationship (β=.15, p=.006), social self-efficacy (β=.31, p<.001), depression (β=-.48, p<.001). Depression had the greatest influence on the interpersonal relationship competency. The explanatory power of model was 57.0% (F=24.54, p<.001). Conclusion: The results of this study indicate that it is necessary to identify the level of interpersonal relationship competency and implement various curricular and extracurricular programs for enhancing interpersonal relationship competency among nursing students.