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추성호(Sung-Ho Choo),이주원(Joo-Won Lee),이우남(Woo-Nam Lee),김현홍(Hyun-Hong Kim),박종배(Jong-Bae Park),신중린(JoongRin-Shin) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This paper presents the development method of educational simulator for Power System Analysis. The developed simulator can be made the students to model, analysis of power systems by drawing the system and performing the load flow, fault analysis by themselves under window environment. The simulator has developed by using the language based on XML(extensible Markup Language). Therefore, we determine that this simulator is useful to educate the load flow and fault analysis.
관측시스템 실험을 통한 한반도 근해 Argo 플로트 관측자료의 자료동화 효과 평가
추성호(Sung-Ho Choo),장필훈(Pil-Hun Chang),황승언(Seung-On Hwang),조형준(Hyeong-Jun Jo),이조한(Johan Lee),이상민(Sang-Min Lee),현유경(Yu-Kyung Hyun),문재홍(Jae-Hong Moon) 한국기상학회 2021 대기 Vol.31 No.3
An Observing System Experiment (OSE) using Global Ocean Data Assimilation and Prediction System (GODAPS) was conducted to evaluate the assimilation impact of Argo floats, deployed by National Institute of Meteorological Sciences/Korea Meteorological Administration (NIMS/KMA), in marginal seas around Korean peninsula. A data denial experiment was run by removing Argo floats in the Yellow Sea and the East Sea from an operational run. The assimilation results show that Argo floats bring the positive impact on the analysis of ocean internal structure in both Yellow Sea and East Sea. In the East Sea, overall positive impact in the water temperature and salinity context is found, especially outstanding improvement from 300 to 500 m depth. In the Yellow sea, the assimilation impact on water temperature and salinity is also large within 50 m depth, especially greater impact than the East Sea in salinity. However, in the Yellow Sea, the influence of Argo floats tends to be restricted to the vicinity of Argo floats, because there was only one Argo float in the middle of the Yellow Sea during the experiment period. Given that the only limited number of Argo floats generally contribute in a positive way to the improvement of the GODAPS, further progress could be expected with adding more observations from Argo floats to current observing systems.
Argo 플로트와 표류부이 관측자료를 활용한 기상청 전지구 해양모델(NEMO)의 검증: 최신 미해군 해양모델(HYCOM)과 비교
현승훤(Seung-Hwon Hyun),황승언(Seung-On Hwang),이상민(Sang-Min Lee),추성호(Sung-Ho Choo) 한국기상학회 2022 대기 Vol.32 No.1
This paper describes verification results for the ocean analysis field produced by the Nucleus for European Modelling of the Ocean (NEMO) of the Korea Meteorological Administration (KMA) against observed Argo floats and drift buoys over the western Pacific Ocean and the equatorial Pacific during 2020~2021. This is confirmed by a comparison of the verification for the newly updated version of the HYbrid Coordinate Ocean Model/Navy Coupled Ocean Data Assimilation (HYCOM/NCODA) against same observations. NEMO shows that the vertical ocean temperature is much closer to the Argo floats than HYCOM for most seasons in terms of bias and root mean square error. On the other hand, there are overall considerable cold biases for HYCOM, which may be due to the more rapid decreasing temperature at the shallow thermocline in HYCOM. Conclusion demonstrated that the NEMO analysis for ocean temperature is more reliable than the analysis produced by the latest version of HYCOM as well as by the out-of-date HYCOM applied to the precedent study. The surface ocean current produced by NEMO also shows 14% closer to the AOML (Atlantic Oceanographic and Meteorological Laboratory) in situ drift buoys observations than HYCOM over the western Pacific Ocean. Over the equatorial Pacific, however, HYCOM shows slightly closer to AOML observation than NEMO in some seasons. Overall, this study suggests that the resulting information may be used to promote more use of NEMO analysis.
기상청 전지구 해양자료동화시스템(GODAPS): 개요 및 검증
장필훈(Pil-Hun Chang),황승언(Seung-On Hwang),추성호(Sung-Ho Choo),이조한(Johan Lee),이상민(Sang-Min Lee),부경온(Kyung-On Boo) 한국기상학회 2021 대기 Vol.31 No.2
The Global Ocean Data Assimilation and Prediction System (GODAPS) in operation at the KMA (Korea Meteorological Administration) is introduced. GODAPS consists of ocean model, ice model, and 3-d variational ocean data assimilation system. GODAPS assimilates conventional and satellite observations for sea surface temperature and height, observations of sea-ice concentration, as well as temperature and salinity profiles for the ocean using a 24-hour data assimilation window. It finally produces ocean analysis fields with a resolution of 0.25 ORCA (tripolar) grid and 75-layer in depth. This analysis is used for providing a boundary condition for the atmospheric model of the KMA Global Seasonal Forecasting System version 5 (GloSea5) in addition to monitoring on the global ocean and ice. For the purpose of evaluating the quality of ocean analysis produced by GODAPS, a one-year data assimilation experiment was performed. Assimilation of global observing system in GODAPS results in producing improved analysis and forecast fields with reduced error in terms of RMSE of innovation and analysis increment. In addition, comparison with an unassimilated experiment shows a mostly positive impact, especially over the region with large oceanic variability.
Wei Li(이위),Hee-Geun Park(박희근),Young-Ran Lee(이영란),Hak-young Jang(장학영),Young Hwa Lee(이영화),Gan Li(감력),Sung-Ho Choo(추성호),Jong-Kui Jun(전종귀),Wang-Lok Lee(이왕록),Sang Ki Lee(이상기) 한국생명과학회 2012 생명과학회지 Vol.22 No.5
이 연구는 자연발생고혈압쥐(SHR)의 혈압, 골격근에서의 혈관생성 및 혈관내피세포성장인자 발현(VEGF)에 미치는 지구성운동의 효과를 조사하였다. 5주령 SHR와 WKY는 무작위로 정상혈압군(WKY, Wistar-Kyoto rat, n=9), 고혈압통제군(SHR-C, SHR Control, n=9) 및 고혈압운동군(SHR-E, SHR Exercise, n=9)으로 각각 분류하였고, 지구성운동은 트레드밀을 이용하였다(12-20 m/min, 0% grade, 60 min/day, 5 days/wk, 16 wk). 수축기혈압은 지구성운동에 의해 효과적으로 감소되었다(SHR-E vs. SHR-C, p<0.05). 골격근의 모세혈관밀도와 VEGF 단백발현은 고혈압통제군(SHR-C)이 정상혈압군(WKY)보다 모두 감소되었으나, 지구성운동(SHR-E)이 고혈압통제군(SHR-C)에 비해 모두 증가되었다. 이러한 결과들은 지구력운동 트레이닝이 SHR 골격근의 VEGF 단백발현의 증가를 통해 모세혈관밀도를 향상시키고, 이러한 모세혈관밀도의 향상이 SHR의 혈압상승을 억제할 수 있다는 것을 의미한다. This study investigated the effect of endurance exercises on blood pressure, angiogenesis, and the vascular endothelial growth factor (VEGF) expression in the skeletal muscle of spontaneously hypertensiverats (SHR). Five week old SHRs and Wistar-Kyoto rats (WKY) were randomly divided into 3 groups: Wistar-Kyoto rats (WKY, n=9), SHR control (SHR-C, n=9), and SHR endurance exercise training (SHR-E, n=9). Endurance exercise training was performed on a treadmill (12-20 m/min, 0% grade, 60 min/day, 5 days/week, 16 weeks). Systolic blood pressure was monitored with the tail-cuff method. The expression of VEGF protein and capillary density were identified using western blotting and H&E staining in the soleus muscle, respectively. Systolic blood pressure was reduced by endurance exercise in SHR (p<0.05). The capillary density of skeletal muscles in SHR-C was lower than in WKY (p<0.05), but it was recovered by endurance exercise training (SHR-E) compared to SHR-C (p<0.05), and VEGF protein was also increased by endurance exercise training compared to SHR-C (p<0.05). These data suggest that the enhancement of capillary density via an increase of VEGF expression in skeletal muscles by endurance exercise training could be an important factor to inhibit blood pressure elevation in SHR.