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ICE-POP 2018 기간 드롭존데 자료를 활용한 강설 구름의 열역학적 특성
정승필(Sueng-Pil Jung),이철규(Chulkyu Lee),김지형(Ji-Hyoung Kim),양효진(Hyo Jin Yang),윤종환(Jong Hwan Yun),고희종(Hee Jong Ko),홍성은(Seong-Eun Hong),김승범(Seung-Bum Kim) 한국기상학회 2020 대기 Vol.30 No.1
The aircraft observation campaign was performed to investigate thermodynamic conditions of snowfall cloud over the East Sea of Korean peninsula from 2 February to 16 March 2018. During this period, four snowfall events occurred in the Yeongdong region and three cases were analyzed using dropsonde data. Snowfall cases were associated with the passage of southern low-pressure (maritime warm air mass) and expansion of northern high-pressure (continental polar air mass). Case 1 and Case 2a were related to low-pressure systems, and Case 2b and Case 3 were connected with high-pressure systems, respectively. And their thermodynamic properties and horizontal distribution of snowfall cloud were differed according to the influence of the synoptic condition. In Case 1 and Case 2a, atmospheric layers between sea surface and 350 hPa contained moisture more than 15 mm of TPW with multiple inversion layers detected by dropsonde data, while the vertical atmosphere of Case 2b and Case 3 were dry as TPW 5 mm or less with a single inversion inversion layer around 750~850 hPa. However, the vertical distributions of equivalent potential temperature (θe) were similar as moist-adiabatically neutral condition regardless of the case. But, their values below 900 hPa were about 10 K higher in Case 1 and Case 2a (285~290 K) than in Case 2b and Case 3 (275~280 K). The difference in these values is related to the characteristics of the incoming air mass and the location of the snowfall cloud.
고희종,김승훈,서수연,이리형,홍원기,장재호 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.1
Composite beams are generally designed to resist to the gravity and horizontal load. However, when these are used to underground buildings, the axial force by earth pressure should be considered in the design. This paper presents the experimental result of the composite beam subjected to both constant axial and various bending moments. Main parameters in the test are magnitude, loading time of axial force and composite ratio. It is shown that the axial force and the composite ratio increase the flexural strength of the beam while these reduce the deformability.