기상 및 수문학적 가뭄지수와 위성 식생지수를 활용한 2012년 봄 가뭄 분석

안소라,이준우,김성준,Ahn, So-Ra,Lee, Jun-Woo,Kim, Seong-Joon 한국관개배수위원회 2014 한국관개배수논문집 Vol.21 No.1

This study is to analyze the 2012 spring drought of Korea using drought index and satellite image. The severe spring drought recorded in May of 2012 showed 36.4% of normal rainfall(99.5mm). The areas of west part of Gyeonggi-do and Chungcheong-do were particularly serious. The drought indices both the SPI(Standardized Precipitation Index) and WADI(WAter supply Drought Index) represented the drought areas from the end of May and to the severe drought at the end of June. The drought by SPI completely ended at the middle of July, but the drought by WADI continued severe drought in the agricultural reservoir watersheds of whole country even to the end of the July. On the other hand, the results by spatial NDVI(Normalized Difference Vegetation Index) and EVI(Enhanced Vegetation Index) data from Terra MODIS, both indices showed relatively low values around the areas of Sinuiju, Pyongyang, and west coast of North Korea and Gyeonggi-do and Chungcheong-do of South Korea indicating drought condition. Especially, the values of NDVI and EVI at Chungcheong-do were critically low in June compared to the normal year value.

Analytic Model of Spin-Torque Oscillators (STO) for Circuit-Level Simulation

안소라,임혜인,신형순,이승준 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.1

Spin-torque oscillators (STO) is a newdevice that can be used as a tunable microwavesource in various wireless devices. Spin-transfertorque effect in magnetic multilayered nanostructurecan induce precession of magnetization when biascurrent and external magnetic field are properlyapplied, and a microwave signal is generated from thatprecession. We proposed a semi-empirical circuit-levelmodel of an STO in previous work. In this paper, wepresent a refined STO model which gives moreaccuracy by considering physical phenomena in thecalculation of effective field. Characteristics of the STOare expressed as functions of external magnetic fieldand bias current in Verilog-A HDL such that they canbe simulated with circuit-level simulators such asHspice. The simulation results are in good agreementwith the experimental data.

다목적 댐 및 다기능 보 운영을 고려한 대유역 SWAT 모형 구축기법 연구 - 남한강 유역을 대상으로 -

안소라,이지완,장선숙,김성준,Ahn, So Ra,Lee, Ji Wan,Jang, Sun Sook,Kim, Seong Joon 한국농공학회 2016 한국농공학회논문집 Vol.58 No.4

This study is to evaluate the applicability of SWAT (Soil and Water Assessment Tool) model for multi-purpose dams and multi-function weirs operation in Namhan river basin ($12,577km^2$) of South Korea. The SWAT was calibrated (2005 ~ 2009) and validated (2010 ~ 2014) considering of 4 multi-purpose dams and 3 multi-function weirs using daily observed dam inflow and storage, evapotranspiration, soil moisture, and groundwater level data. Firstly, the dam inflow was calibrated by the five steps; (step 1) the physical rate between total runoff and evapotranspiration was controlled by ESCO, (step 2) the peak runoff was calibrated by CN, OV_N, and CH_N, (step 3) the baseflow was calibrated by GW_DELAY, (step 4) the recession curve of baseflow was calibrated by ALPHA_BF, (step 5) the flux between lateral flow and return flow was controlled by SOL_AWC and SOL_K, and (step 6) the flux between reevaporation and return flow was controlled by REVAPMN and GW_REVAP. Secondly, for the storage water level calibration, the SWAT emergency and principle spillway were applied for water level from design flood level to restricted water level for dam and from maximum to management water level for weir respectively. Finally, the parameters for evapotranspiration (ESCO), soil water (SOL_AWC) and groundwater level fluctuation (GWQMN, ALPHA_BF) were repeatedly adjusted by trial error method. For the dam inflow, the determination coefficient $R^2$ was above 0.80. The average Nash-Sutcliffe efficiency (NSE) was from 0.59 to 0.88 and the RMSE was from 3.3 mm/day to 8.6 mm/day respectively. For the water balance performance, the PBIAS was between 9.4 and 21.4 %. For the dam storage volume, the $R^2$ was above 0.63 and the PBIAS was between 6.3 and 13.5 % respectively. The average $R^2$ for evapotranspiration and soil moisture at CM (Cheongmicheon) site was 0.72 and 0.78, and the average $R^2$ for groundwater level was 0.59 and 0.60 at 2 YP (Yangpyeong) sites.

李압(土+甲)의 생애와 연행에 대한 一考察 - 燕行記事를 중심으로-

안소라 고려대학교 한국언어문화학술확산연구소 2014 Journal of Korean Culture Vol.27 No.-

By the late 18th century, the Qing Dynasty had maintained national stability over 100 years governing China. Lee Ap (1737-1795) visited the late Imperial China several times when the negative attitude towards Qing China had changed to a more acknowledging and accepting one. Lee Ap who was a scion of the founding member had the full confidence of King Youngjo and Jungjo on the strength of his family stature, and his mother's side was Bannam Park family and on the friendly terms with Park Ji-won. He was raised by relatives since he lost his parents at age of three, and his basic knowledge of China was probably due to them. In 1777, he wrote Yeonhaengkisa, which is a realistic depiction of his notes. In Yeonhaengkisa, he was not biased in favor of China and made close obser vations of straight facts. He was also aware of the prevalent problems in China. There are many similarities between him and the Yeonam Faction (Park Yeonam Ji Won and the adherents of his philosophy). It seems that he also had features of Yeonam faction because he had a close relation with Yeonam. He kept an eye on other nations and considered which countries he should pay special attention to. He especially showed a friendly attitude to the West, but unfortunately some descriptions of the West were erased deliberately due to special circumstances of this period. 18세기 후반의 청나라는 중국을 지배한 지 백 년이 지나, 안정적으로 자리를 잡아가고 있던 중이었다. 즉, 李(1737-1795)의 연행은 유효기간이 지난 북벌이란 논의가 점차 북학이라는 논의의 틀로 확정되어 가고 있는 과정 속에서 진행되었던 것이다. 이압은 공신의 후손으로서 집안의 후광에 힘입어 영조와 정조의 신임을 두텁게 받았고, 외가는 연암 박지원과 같은 반남 박씨 가문일 뿐 아니라 박지원과는 가깝게 지내던 집안이었다. 그는 3살 때 부모를 여의고 친족들의 영향을 많이 받고 자랐는데, 친족들이 연행을 많이 다녔기 때문에 중국에 대해 어느 정도의 관심과 지식을 갖고 있었음을 짐작할 수 있다. 이압은 1777년에 동지 겸 사은 부사로 청나라에 다녀와 『燕行記事』를 남겼다. 『燕行記事』를 살펴보면, 이압이 연행기간 동안 중국 사회에 대해 편향되지 않으면서 있는 그대로의 현실을 예리하게 관찰하고, 중국 사회에서 드러나고 있는 문제점 등도 인식하고 있었던 것을 확인할 수 있다. 이와 같은 이압의 행보는 이 시기 연암 일파로 분류되는 사람들에게 보이는 의식과 상통되는데, 이압 역시 연암과 밀접한 관계가 있기 때문에 연암 일파로서의 면모를 갖추고 있던 것으로 판단된다. 이압은 또한 중국을 통해 다른 나라들도 주시하면서, 어느 나라에 대해 더욱 주의하고 대비해야할지도 생각하는 모습도 보인다. 특히 서양에 대하여는 우호적인 태도를 취하였는데, 이 시기 특수한 상황 때문에 서양에 대한 기술 가운데 의도적으로 삭제된 부분이 있는 것은 아쉬운 점이다.

SWAT과 MODSIM-DSS 모형을 연계한 금강유역의 농업용수 공급능력 평가

안소라,박근애,김성준,Ahn, So Ra,Park, Geun Ae,Kim, Seong Joon 대한토목학회 2013 대한토목학회논문집 Vol.33 No.2

본 연구에서는 SWAT 모형과 MODSIM-DSS 모형을 이용하여 금강유역(9,865 $km^2$)의 농업용수 공급능력을 평가하고자 하였다. 하천유역 네트워크 물수지 모형인 MODSIM-DSS를 이용하여 금강유역을 14개의 소유역으로 구분하고 다목적댐과 농업용 수리시설을 고려한 물수지 네트워크를 소유역별로 구성하여 물수지 분석을 수행하였다. MODSIM-DSS의 유역별 유입량(공급량) 자료는 SWAT 모형의 소유역별 유출결과를 사용하였다. SWAT 모형의 신뢰성 있는 유출량 보정을 위해 금강유역 내 위치하는 2개의 다목적댐(용담, 대청)의 실측 방류량을 이용하여 댐 운영모의를 고려하여 모형의 보정(2005~2007)과 검증(2008~2010)을 실시하였다. 이후 MODSIM-DSS를 이용하여 8개년(2004~2011) 동안의 물수지 분석을 수행한 결과 과거 실제로 가뭄이 발생했던 기간인 2006년, 2008년, 2009년에 농업용수 부족량이 평년에 비해 많이 발생하는 것으로 나타났으며, 부족량은 각각 282 $10^6m^3$, 286 $10^6m^3$, 329 $10^6m^3$로 분석되었다. 유역평균 농업용수 공급능력이 86.4%인데 비해 2006년, 2008년, 2009년에 각각 81.6%, 81.5%, 78.5%로 농업용수 공급능력이 떨어지는 것을 알 수 있었다. This study is to evaluate agricultural water supply capacity in Geum river basin (9,865 $km^2$), one of the 5 big river basin of South Korea using MODSIM-DSS (MODified SIMyld-Decision Support System) model. The model is a generalized river basin decision support system and network flow model developed at Colorado State University designed specifically to meet the growing demands and pressures on river basin management. The model was established by dividing the basin into 14 subbasins and the irrigation facilities viz. agricultural reservoirs, pumping stations, diversions, culverts and groundwater wells were grouped and networked within each subbasin and networked between subbasins including municipal and industrial water supplies. To prepare the inflows to agricultural reservoirs and multipurpose dams, the Soil and Water Assessment Tool (SWAT) was calibrated using 6 years (2005-2010) observed dam inflow and storage data. By MODSIM run for 8 years from 2004 to 2011, the agricultural water shortage had occurred during the drought years of 2006, 2008, and 2009. The agricultural water shortage could be calculated as 282 $10^6m^3$, 286 $10^6m^3$, and 329 $10^6m^3$ respectively.

"세월호, 끝나지 않은 이야기 : 트라우마센터의 경험과 과제"

안소라 한국정신건강사회복지학회 2014 한국정신건강사회복지학회 학술발표논문집 Vol.2014 No.11

기상인자가 농업용 저수지 저수량에 미치는 영향연구

안소라,박민지,박근애,김성준,Ahn, So-Ra,Park, Min-Ji,Park, Geun-Ae,Kim, Seong-Joon 한국농공학회 2007 한국농공학회논문집 Vol.49 No.4

The purpose of this paper is to analyze the relationship between meteorological factors and agricultural reservoir storage, and predict the reservoir storage by multiple regression equation selected by high correlated meteorological factors. Two agricultural reservoirs (Geumgwang and Gosam) located in the upsteam of Gongdo water level gauging station of Anseong-cheon watershed were selected. Monthly reservoir storage data and meteorological data in Suwon weather station of 21 years (1985-2005) were collected. Three cases of correlation (case 1: yearly mean, case 2: seasonal mean dividing a year into 3 periods, and case 3: lagging the reservoir storage from 1 month to 3 months under the condition of case 2) were examined using 8 meteorological factors (precipitation, mean/maximum/minimum temperature, relative humidity, sunshine hour, wind velocity and evaporation). From the correlation analysis, 4 high correlated meteorological factors were selected, and multiple regression was executed for each case. The determination coefficient ($R^{2}$) of predicted reservoir storage for case 1 showed 0.45 and 0.49 for Geumgwang and Gosam reservoir respectively. The predicted reservoir storage for case 2 showed the highest $R^{2}$ of 0.46 and 0.56 respectively in the period of April to June. The predicted reservoir storage for 1 month lag of case 3 showed the $R^{2}$ of 0.68 and 0.85 respectively for the period of April to June. The results showed that the status of agricultural reservoir storage could be expressed with couple of meteorological factors. The prediction enhanced when the storage data are divided into periods rather than yearly mean and especially from the beginning time of paddy irrigation (April) to high decrease of reservoir storage (June) before Jangma.

Comparison of SWAT Streamflow and Water Quality in an Agricultural Watershed using KOMPSAT-2 and Landsat Land Use Information

안소라,박종윤,이지완,이미선,김성준 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.1

This study investigated streamflow and water quality using the Soil and Water Assessment Tool (SWAT) and by applying two land use datasets from KOrea Multi-Purpose SATellite (KOMPSAT)-2 and Landsat TM (Thematic Mapper) images. For a 262.3 km2 agricultural watershed located in the northwest part of South Korea, the Landsat TM and KOMPSAT-2 could produce 8 and 25 land use classes from spatial resolutions of 30 m and 2 m, respectively. For each land use condition, the SWAT model was calibrated and validated using 8 years (2000-2007) of daily streamflow and monthly sediment, Total Nitrogen (T-N), and Total Phosphorous (T-P) data. The average Nash-Sutcliffe model Efficiencies (NSEs) of streamflow for KOMPSAT-2 and Landsat were 0.80 and 0.71, respectively. The average NSEs of sediment, T-N, and T-P were 0.52, 0.97, and 0.67 for KOMPSAT-2 and 0.30, 0.77, and 0.35 for Landsat, respectively. From the difference in the areal statistics and distribution between the two land uses, the key parameter for streamflow calibration was SCS-CN (Soil Conservation Service-CN). The watershed average SCS-CN value from KOMPSAT-2 was 1.05-fold greater than that from Landsat TM. The larger SCS-CN value increased the surface runoff and subsequently increased the sediment, T-N and T-P transport in the stream

Evaluation of Future Climate Change Impact on Streamflow of Gyeongancheon Watershed Using SLURP Hydrological Model

안소라,이용준,김성준,하림,박근애 대한원격탐사학회 2008 大韓遠隔探査學會誌 Vol.24 No.1

The impact on streamflow and groundwater recharge considering future potential climate and land use change was assessed using SLURP (Semi-distributed Land-Use Runoff Process) continuous hydrologic model. The model was calibrated and verified using 4 years (1999-2002) daily observed streamflow data for a 260.4 km2 which has been continuously urbanized during the past couple of decades. The model was calibrated and validated with the coefficient of determination and Nash-Sutcliffe efficiency ranging from 0.8 to 0.7 and 0.7 to 0.5, respectively. The CCCma CGCM2 data by two SRES (Special Report on Emissions Scenarios) climate change scenarios (A2 and B2) of the IPCC (Intergovernmental Panel on Climate Change) were adopted and the future weather data was downscaled by Delta Change Method using 30 years (1977 - 2006, baseline period) weather data. The future land uses were predicted by CA (Cellular Automata)-Markov technique using the time series land use data of Landsat images. The future land uses showed that the forest and paddy area decreased 10.8 % and 6.2 % respectively while the urban area increased 14.2 %. For the future vegetation cover information, a linear regression between monthly NDVI (Normalized Difference Vegetation Index) from NOAA/AVHRR images and monthly mean temperature using five years (1998 - 2002) data was derived for each land use class. The future highest NDVI value was 0.61 while the current highest NDVI value was 0.52. The model results showed that the future predicted runoff ratio ranged from 46 % to 48 % while the present runoff ratio was 59 %. On the other hand, the impact on runoff ratio by land use change showed about 3 % increase comparing with the present land use condition. The streamflow and groundwater recharge was big decrease in the future.

절주동아리 close up : 술 취한 당신은 Loser!

안소라 대한보건협회 2009 건강생활 Vol.- No.66