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기후변화에 따른 소양호의 수온 장기 모의 및 불확실성 정량화
윤여정 ( Yeojeong Yun ),박형석 ( Hyungseok Park ),정세웅 ( Sewoong Chung ),김용대 ( Yongda Kim ),온일상 ( Ilsang Ohn ),이서로 ( Seoro Lee ) 한국물환경학회 2020 한국물환경학회지 Vol.36 No.1
Future climate change may affect the hydro-thermal and biogeochemical characteristics of dam reservoirs, the most important water resources in Korea. Thus, scientific projection of the impact of climate change on the reservoir environment, factoring uncertainties, is crucial for sustainable water use. The purpose of this study was to predict the future water temperature and stratification structure of the Soyanggang Reservoir in response to a total of 42 scenarios, combining two climate scenarios, seven GCM models, one surface runoff model, and three wind scenarios of hydrodynamic model, and to quantify the uncertainty of each modeling step and scenario. Although there are differences depending on the scenarios, the annual reservoir water temperature tended to rise steadily. In the RCP 4.5 and 8.5 scenarios, the upper water temperature is expected to rise by 0.029 ℃ (±0.012)/year and 0.048 ℃ (±0.014)/year, respectively. These rise rates are correspond to 88.1 % and 85.7 % of the air temperature rise rate. Meanwhile, the lower water temperature is expected to rise by 0.016 ℃ (±0.009)/year and 0.027 ℃ (±0.010)/year, respectively, which is approximately 48.6 % and 46.3 % of the air temperature rise rate. Additionally, as the water temperatures rises, the stratification strength of the reservoir is expected to be stronger, and the number of days when the temperature difference between the upper and lower layers exceeds 5 ℃ increases in the future. As a result of uncertainty quantification, the uncertainty of the GCM models showed the highest contribution with 55.8 %, followed by 30.8 % RCP scenario, and 12.8 % W2 model.
임베디드 시스템에서 Compositing 윈도우 매니저의 선택적 적용에 따른 Drawing 성능 향상 방법
윤여정(Yeojeong Yoon),김지홍(Jeehong Kim),엄영익(Young Ik Eom) 한국정보과학회 2011 정보과학회 컴퓨팅의 실제 논문지 Vol.17 No.2
데스크탑 환경의 X 윈도우 시스템에서 Compositing 윈도우 매니저는 윈도우 알파 블랜딩 등의 비주얼 효과(visual effect)를 가능하게 하였다. 이와 마찬가지로 임베디드 시스템에서도 X 윈도우 시스템과 Compositing 윈도우 매니저를 이용한 다양한 효과를 시도하고 있다. 하지만, 임베디드 환경에서는 하드웨어의 제약이 크기 때문에 Compositing 윈도우 매니저를 이용한 비주얼 효과 구현은 성능상의 문제를 동반한다. 이에 따라 본 논문에서는 Compositing 윈도우 매니저를 사용함으로써 나타날 수 있는 성능저하의 원인을 분석하였다. 그리고 임베디드 시스템에서의 성능 저하 문제를 해결하기 위하여 Compositing 윈도우 매니저의 사용을 X윈도우 속성을 사용하여 응용프로그램이 선택할 수 있도록 하는 방법을 제안한다. 제안한 방식을 사용하면 응용프로그램 윈도우의 X 윈도우 속성이 설정된 경우 Compositing 윈도우 매니저의 윈도우간 합성과정을 거치지 않게 함으로써 Compositing 윈도우 매니저로 인한 불필요한 성능저하를 피할 수 있었다. As X Window System introduces Compositing Window Manager in Linux Desktop environment, it is possible to provide fancy visual effects such as alpha blending windows and window transition effect. Recently many embedded systems also make efforts to provide outstanding visual effect using Compositing Window Manager. However, it is hard to achieve such effects in the embedded system due to performance limitation. In order to improve performance, we propose a new scheme for an application using X window property to decide whether it uses Compositing Window Manager or not. Our scheme can improve drawing performance significantly for applications such as Flash player and JAVA that update images continuously.
김여정,형식,KIM YEOJEONG,HYUNG SIEK,ALLER LAWRENCE H. 한국천문학회 2000 天文學論叢 Vol.15 No.suppl1
Symbiotic stars are known as binary systems with both cool and hot components with enshrounding nebulous gas. The cool component, M-type giant, is presumably loosing its mass into a hot white or main sequence companion star through the inner Lagrangian point. The lines emit from the ionized nebulous region around the hot star while the mass loss or accretion activity is believed to be the main cause of sudden variation of the continuum and line fluxes. We selected 17 symbiotics for which the emission line fluxes were measured from the IUE SWP, LWR data, to find variability of spectrum. We also investigated the periodic variation of emissions or eclipsing effect from the IUE lines. All of our symbiotics show very high electron densities in the emission regions. For other optical symbiotics, the observations had been carried in 1999 with BOAO mid-resolution spectrometer. We classified symbiotics based on their outburst activities, or emission line characteristics, i.e., $OVI{\lambda}6830.\;The\;OVI{\lambda}6830$ emission lines are also found in S-type symbiotics, which have been known as charateristics of D-types.
김강민,김여정,윤태석,KIM KANG-MIN,KIM YEOJEONG,YOON TAE SEOG 한국천문학회 2001 Journal of The Korean Astronomical Society Vol.34 No.1
We tested the characteristics of the BOAO Medium Dispersion Spectrograph (MDS) such as the CCD capabilities, wavelength shift by gravity direction variation, slit illumination function and efficiency. Then we calculated the appropriate exposure time to obtain the given S/N ratio for several given magnitudes. Also the remaining problems to be improved were discussed.
전진무(Jinmoo Jeon),민경휘(Gyeonghwi Min),김여정(Yeojeong Kim),김동현(Donghyun Kim) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
The knuckle of the in-wheel system functions as a knuckle of the conventional vehicle and a housing for supporting the reducer and the motor. In-wheel knuckle should maintain rigidity against deformation by the motor and reducer during inwheel operation in order to ensure NVH performance, also in order to secure the vehicle R&H performance, it should be designed to support load from wheel, secure stiffness and reduce the unsprung mass. In this thesis, we performed the lightweight of knuckle in in-wheel system with motor and reducer by using topology optimization. After the optimization, we verified the static strength and stiffness analysis through finite element analysis and compared the transmission error through the gear analysis program and then we could check the effectiveness of the lightweight design. As a result of comparison between before and after, we confirmed stiffness securement and weight reduction.