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기상-식생 모델을 이용한 연안 분지 도시 지역의 대기 중 CO<sub>2</sub> 시뮬레이션
박창현 ( Changhyoun Park ),이화운 ( Hwa Woon Lee ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.6
The Weather Research and Forecasting (WRF) model and Vegetation Photosynthesis and Respiration Model (VPRM) were coupled to simulate atmospheric CO<sub>2</sub> concentrations. The performance of the WRF-VPRM to simulate regional scale CO<sub>2</sub> concentration was estimated over coastal basin areas. Either Hestia 2011(HST) or Vulcan 2002(VUL) anthropogenic CO<sub>2</sub> emission data were used in two numerical experiments for the study regions. Simulated meteorological variables were validated with ground and background CO<sub>2</sub> measurement data, and the results show that the model captured temporal variations of CO<sub>2</sub> concentration on a daily basis. CO<sub>2</sub> directional analysis revealed that the dominant CO<sub>2</sub> emission sources are located S and SW. The simulated Net Ecosystem Exchange (NEE) agreed relatively well with measured CO<sub>2</sub> fluxes at each vegetation class site, showing approximately 40% at max improvement at shrub areas.
연안 분지 지역 상공에서의 대기 중 CO<sub>2</sub> 시뮬레이션 결과와 항공 관측 사례 비교
박창현 ( Changhyoun Park ),이귀옥 ( Kwiok Lee ),정우식 ( Woo-sik Jung ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.6
A model coupling a meteorological predictive model and a vegetation photosynthesis and respiration model was used to simulate CO<sub>2</sub> concentrations over coastal basin areas, and modeling results were estimated with aircraft observations during a massive sampling campaign. Along with the flight tracks, the model captured the meteorological variables of potential temperature and wind speed with mean bias results of 0.8℃, and 0.2 m/s, respectively. These results were statistically robust, which allowed for further estimation of the model`s performance for CO<sub>2</sub> simulations. Two high-resolution emission data sets were adopted to determine CO<sub>2</sub> concentrations, and the results show that the model underestimated by 1.8 ppm and 0.9 ppm at higher altitude over the study areas during daytime and nighttime, respectively, on average. Overall, it was concluded that the model`s CO<sub>2</sub> performance was fairly good at higher altitude over the study areas during the study period.
강동배,박창현,정우식,이귀옥,이화운,Kang, Dongbae,Park, Changhyoun,Jung, Woo-Sik,Lee, KwiOk,Lee, Hwa Woon 한국환경과학회 2020 한국환경과학회지 Vol.29 No.7
It is well known that atmospheric environments, including both meteorology and air quality, significantly affect public health, such as chronic lung disease and cancer, and respiratory infections. In this study, we have analyzed correlations between the number of daily respiratory outpatients and the atmospheric environments data for about ten years for the city of Busan, South Korea. The respiratory problem patients data have been categorized into two health-vulnerable groups by age over 65(DayPA_O65) and under 20(DayPA_U20), each of which shows relatively higher correlations with air quality and meteorology, respectively. However, time series analysis with factor separation results in that DayPA_O65 and DayPA_U20 show a higher relation with variance components and daily irregular factors of atmospheric concentrations, respectively.
Active Hydro Mount 제어를 위한 GUI 프로그램 개발
오상흔(Sanghuen Oh),박창현(Changhyoun Park),손병상(Byungsang Son),김용학(Yonghak Kim) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
Vibrations caused by automobile engine are absorbed mostly by a passive-type engine mount. However, user specifications for automobile vibrations require more stringent conditions and higher standard. Vehicles using high-efficiency powertrain technology such as Cylinder de-activation engine, turbo engine with the elimination of the BSM(Banlace Shafte Module) have also increased production. In order to effectively block various vibration source of powertrain and satisfy customers, a new anti-vibration system is required, and the alternative is Active Hydro Engine Mount technology. In this study, We introduce GUI program developed to control ActroM(Active Hydro Engine Mount) effectively and easily.
기상수치모의 자료를 이용한 부산지역의 소형풍력발전 시스템 적용에 관한 연구
이귀옥 ( Kwiok Lee ),이강열 ( Kangyeol Lee ),강동배 ( Dongbae Kang ),박창현 ( Changhyoun Park ),정우식 ( Woo Sik Jung ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.6
We investigate the amount of potential electricity energy generated by wind power in Busan metropolitan area, using the mesoscale meteorological model WRF (Weather Research & Forecasting), combined with small wind power generators. The WRF modeling has successfully simulated meteorological characteristics over the urban areas, and showed statistical significant to predict the amount of wind energy generation. The highest amount of wind power energy has been predicted at the coastal area, followed by at riverbank and upland, depending on predicted spatial distributions of wind speed. The electricity energy prediction method in this study is expected to be used for plans of wind farm constructions or the power supplies.
한국 남동연안의 냉수대 영향에 의한 해풍순환과 오존농도의 사례 연구
지효은 ( Hyo Eun Ji ),이순환 ( Soon Hwan Lee ),박창현 ( Changhyoun Park ),이화운 ( Hwa Woon Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.2
This work investigates the relationship between the sea breeze circulation and ozone concentrations during cold water events in the southeastern coastal area of the Korean Peninsula, where coastal upwelling frequently occur. This analysis was performed based on the classification of two categories, such as cold water and non-cold water events, over the period of 2000-2009. The low air temperature (0.5℃), low SST (5℃) and the wind direction(southerly) are the features of the cold water events in the Southeastern coastal area. Moreover, ozone concentrations in the cases of the sea breeze circulation and cold water events were significantly lower (below 30 ppb) than those (70∼100 ppb) in the non-clod water events, because of the low air temperature (10∼20℃) and high wind speed (3∼5 m/s) around the southeastern coastal area.
점탄성-탄소성 재료 모델을 이용한 ACTIVE MOUNT 동특성 해석
박태윤(Taeyun Prak),봉성문(Sungmun Bong),김태한(Taehan Kim),박창현(Changhyoun Park) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
The engine mount of a car subjected to a pre-load related to the weight of the engine, and acts to insulate the vibration coming from the engine by moving on large or small displacement depending on the driving condition of the car. The vibration insulation of the engine mount is an effect obtained by dissipating the mechanical energy into heat by the viscosity characteristic of the rubber and the microscopic behavior of the additive carbon black. Therefore, dynamic stiffness from the intrinsic properties of rubber filled with carbon black at the design stage is an important design consideration. In this paper, we introduced a hyper-elastic, visco-elastic and elasto-plastic model to predict the dynamic characteristics of rubber, and developed a fitting program to determine the material model parameters using MATLAB. The dynamic characteristics analysis of the rubber insulator of the ACTIVE MOUNT was carried out by using MSC.MARC nonlinear structural analysis software, which provides the dynamic characteristics material model. The analysis results were compared with the dynamic characteristics test results of the rubber insulator, which is one of the active mount components, and the analysis results were confirmed to be valid.