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Does El Niño-Southern Oscillation Affect the Precipitation in Korea on Seasonal Time Scales?
허창회,최우석,김진원,Maeng-Ki Kim,유희동 한국기상학회 2016 Asia-Pacific Journal of Atmospheric Sciences Vol.52 No.4
A number of studies in the past two decades have attempted to find the relationship between the precipitation in Korea and the El Niño-Southern Oscillation (ENSO) on various time scales. Comprehensive analyses of station precipitation data in Korea for the 61-year period, 1954-2014, in this study show that the effects of ENSO on the seasonal precipitation in Korea are practically negligible. The correlation between summer precipitation and ENSO is insignificant regardless of the intensity, type (e.g., eastern-Pacific or central-Pacific), and stage (e.g., developing, mature, or decaying) of ENSO. Somewhat meaningful correlation between ENSO and precipitation in Korea occurs only in the ENSO-developing fall. Because summer rainfall accounts for over half of the annual total and fall is a dry season in Korea, the overall effects of ENSO on precipitation in Korea are practically nonexistent.
허창회,박태원,전상윤,이민희,박창의,김진원,이석조,홍유덕,송창근,이재범 한국기상학회 2011 Asia-Pacific Journal of Atmospheric Sciences Vol.47 No.4
A series of coupled atmosphere-ocean-land global climate model (GCM) simulations using the National Center for Atmospheric Research (NCAR) Community Climate System Model 3 (CCSM3)has been performed for the period 1870-2099 at a T85 horizontal resolution following the GCM experimental design suggested in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4). First, a hindcast was performed using the atmospheric concentrations of three greenhouse gases (CO2, CH4,N2O) specified annually and globally on the basis of observations for the period 1870-1999. The hindcast results were compared with observations to evaluate the GCM’s reliability in future climate simulations. Second, climate projections for a 100-year period (2000-2099) were made using six scenarios of the atmospheric concentrations of the three greenhouse gases according to the A1FI, A1T, A1B, A2,B1, and B2 emission profiles of the Special Report on Emissions Scenarios. The present CCSM simulations are found to be consistent with IPCC’s AR4 results in the temporal and spatial distributions for both the present-day and future periods. The GCM results were used to examine the changes in extreme temperatures and precipitation in East Asia and Korea. The extreme temperatures were categorized into warm and cold events: the former includes tropical nights, warm days,and heat waves during summer (June-July-August) and the latter includes frost days, cold days, and cold surges during winter (December-January-February). Focusing on Korea, the results predict more frequent heat waves in response to future emissions: the projected percentage changes between the present day and the late 2090s range from 294% to 583% depending on the emission scenario. The projected global warming is predicted to decrease the frequency of cold extreme events; however, the projected changes in cold surge frequency are not statistically significant. Whereas the number of cold surges in the A1FI emission profile decreases from the present-day value by up to 24%, the decrease in the B1 scenario is less than 1%. The frequency and intensity of extreme precipitation events year-round were examined. Both the frequency and the intensity of these events are predicted to increase in the region around Korea. The present results will be helpful for establishing an adaptation strategy for possible climate change nationwide, especially extreme climate events, associated with global warming.
허창회,Heo, Chang-Hoe 한국과학기술단체총연합회 1995 과학과 기술 Vol.28 No.4
대한한의사 협회는 1952년에 설립되어 전국 15개 시도에 8천여명의 회원을 거느리고 있다. 최근 한의계 전체가 추진하고 있는 한의학의 세계화 운동을 선도하는 대한한의학회는 산하에 19개 분과학회가 있으며 21세기의 미래의학으로 도약하기 위해 국제학술교류 등 활발한 사업을 벌이고 있다.
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허창회,심경석,이상렬 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.9
Ferroelectric thin film capacitors with high dielectric constant are important for the application of memory devices. In this work, We have systematically investigated the variation of grain sizes depending on the process condition of two-step process. Both in-situ annealing and ex-annealing have been compared depending on the annealing time. C-V measurement, ferroelectric properties, leakage current, XRD and SEM were performed to investigate the electircal properties and microstructural properties of Pb(La, Ti)O$_3$ films.