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Mesoscale Simulations of Multi-Decadal Variability in the Wind Resource over Korea
김도용,김진영,김재진 한국기상학회 2013 Asia-Pacific Journal of Atmospheric Sciences Vol.49 No.2
This study investigated multi-decadal variability in the wind resource over the Republic of Korea using the Weather Research and Forecasting (WRF) mesoscale meteorological model. Mesoscale simulations were performed for the period from November 1981 to November 2010. The typical wind climatology over the Korean Peninsula, which is influenced by both continental and oceanic features, was represented by the physics-based mesoscale simulations. Winter had windier conditions with northwesterly flows,whereas less windy with southwesterly flows appeared in summer. The annual mean wind speeds over the Republic of Korea were approximately 2 m s−1 with strong wind in mountainous areas, coastal areas, and islands. The multi-decadal variability in wind speed during the study period was characterized by significant increases (positive trend) over many parts of the study area, even though the various local trends appeared depending on the station locations. The longterm trend in the spatially averaged wind speed was approximately 0.002 m s−1 yr−1. The annual frequency of daily mean wind speeds over 5 m s−1 at the turbine hub height also increased during the study period throughout the Republic of Korea. The present study demonstrates that multi-decadal mesoscale simulations can be useful for climatological assessment of wind energy potential.
기후변화 시나리오 기반의 지역규모 온난화에 관한 연구: 목포시를 대상으로
김도용 한국환경기술학회 2019 한국환경기술학회지 Vol.20 No.3
In this study, projected regional warming in Mokpo city was investigated using RCP 4.5 and RCP 8.5 climate change scenarios. Air temperature showed decadal variations of +0.28 ℃ (RCP 4.5) and +0.66 ~ +0.69 ℃ (RCP 8.5). The temperature in the late 21st century is expected to rise 1.7 ℃ (RCP 4.5) and about 4 ℃ (RCP 8.5). Annual summer days presented decadal variations of +3.45 days (RCP 4.5) and +7.24 days (RCP 8.5). The summer days in the late 21st century are predicted to increase 20.8 days (RCP 4.5) and about 1.4 months (RCP 8.5). Annual heat wave days showed decadal variations of +3.08 days (RCP 4.5) and +9.09 days (RCP 8.5). The heat wave days in the late 21st century will be approximately 4.7 times (RCP 4.5) and 7.3 times (RCP 8.5) longer than the heat wave days in the early 21st century. Annual tropical night days presented decadal variations of +5.22 days (RCP 4.5) and +9.64 days (RCP 8.5). Compared to the tropical night days in the early 21st century, the tropical night days in the late 21st century are expected to increase approximately 3.6 times (RCP 4.5) and 3.9 times (RCP 8.5).
기계적 합금화에 의한 비정질 Cu55Ti45 분말의 제조 및 성형
김도용 한국분말야금학회 2000 한국분말재료학회지 (KPMI) Vol.7 No.2
The Cu55Ti45 system was effectively mechanically-alloyed using a pulverizer. Noncrystallinities of the powders were characterized by TEM, X-ray and DSC. The amorphous powders were consolidated without losing their noncrystallinities. The consolidating conditions keeping a non-crystalline were obtained by building a TTT diagram of the amorphous powders. The microhardness of the crystallite and bulk amorphous alloys are also compared.