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장기체공무인기를 위한 제주도 모슬포 지역의 기상환경 분석
조영준,안광득,이희춘,하종철,최규용,조천호,김수복,Cho, Young-Jun,Ahn, Kwang-Deuk,Lee, Hee-Choon,Ha, Jong-Chul,Choi, Reno K.Y.,Cho, Chun-Ho,Kim, Su-Bo 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.4
In this study, the characteristics of main wind direction, vertical temperature and wind speed profile near the Moseulpo airfield for HALE UAV(High Altitude Long Endurance Unmaned Aerial Vehicle) is investigated. The results are summarized as follows, main wind direction is governed by air mass according to season and local wind such as land-sea breeze. The directions of landing and take-off of HALE UAV will be selected as the south-east direction in June ~ August, north-west direction in October ~ March, and south-east direction at daytime in April ~ May, September. Annual variation of temperature at 100 hPa showed that temperature in summer season is lower than winter season. On the other hands, wind speed at 250 hPa in winter season is higher than summer season. The threshold values of temperature and wind speed for HALE UAV flight are $-75^{\circ}C$ and $90ms^{-1}$, which were determined by 5 % frequency value($1.96{\sigma}$), respectively.
장기체공무인기의 운항안전을 위한 남한지역 고도별 풍속 분석
조영준,하종철,최규용,김기훈,임은하,김수복,윤종환,Cho, Young-Jun,Ha, Jong-Chul,Choi, Reno K.Y.,Kim, Ki-Hoon,Lim, Eunha,Kim, Su-Bok,Yun, Jong-Hwan 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.4
We analyzed wind speed over South Korea for HALE UAV(High Altitude Long Endurance Unmaned Aerial Vehicle) flight safety. Annual variation of wind speed at 200 hPa showed that winter season was stronger than summer. According to latitude, wind speeds in January and August were found to be $52{\sim}74m\;s^{-1}$ and $15{\sim}26m\;s^{-1}$, respectively. Wind speed was stronger(weaker) at lower latitudes than higher latitudes in winter(summer). Frequency(%) of wind speed less than threshold value($18m\;s^{-1}$) for the operation date was investigated. The days showing the frequency greater than 60 % in all altitudes of surface ~ 50 hPa showed the range of 1 ~ 33 days at 7 stations. Operation date was the longest period at Gosan. The appropriate date of HALE UAV operation at Gosan and Osan is considered as the middle of July ~ middle of August and end of July ~ early August, respectively. These results can be used to determine the operation date of HALE UAV.
Enhancement of Electrical Conductivity for Ag Grid using Electrical Sintering Method
황준영(Hwang, Jun Y.),문윤재(Moon, Y.J.),이상호(Lee, S.H.),강경태(Kang, K.),강희석(Kang, H.),조영준(Cho, Y.J.),문승재(Moon, S.J.) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Electrical sintering of the front electrode for crystalline silicon solar cells was performed applying a constant DC current to the printed lines. Conducting lines were printed on glass substrate by a drop-on-demand (DOD) inkjet printer and silver nanoparticle ink. Specific resistance and microstructure of sintered silver lines and were measured with varying DC current. To find the relation between temperature increase with changing applied current and specific resistance, temperature elevation was also calculated. Sintering process finished within a few milliseconds. Increasing applied DC current, specific resistance decreased and grain size increased after sintering. Achieved minimum specific resistance is approximately 1.7 times higher than specific resistance of the bulk silver.