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알루미늄-강섬유복합재료의 강도에 미치는 강섬유 방향성의 영향
김석윤 대한금속재료학회(대한금속학회) 1979 대한금속·재료학회지 Vol.17 No.3
亞鉛을 被覆한 것과 亞鉛을 被覆하지 않은 두 狀況의 鋼纖維를 各各 알루미늄 중에 삽입해서 알루미늄-鋼纖維 複合材料를 製造하여, 纖維方向性에 따른 複合材料의 引張强度를 調査했다. Zn-coating한 鋼纖維로 만든 複合材料는 모든 鋼纖維의 配列方向에 있어서 引張强度가 鋼纖維 體積比의 增加와 더불어 增加했다. Zn-uncoating한 鋼纖維로 만든 復合材料는 試片길이方向으로 配列된 鋼纖維의 複合材料의 引張强度는 鋼纖維量과 더불어 增加하지만, 試片길이方向에 45°및 90°方向으로 配列된 鋼纖維로 만든 複合村料의 引張强度는 鋼纖維量의 增加와 더불어 減少했다. Two types of aluminium-composite reinforced with steel fiber were prepared by a casting method; one was fabricated with Zinc-coated steel fiber, and the other the Zinc-uncoated steel fiber. The effect of fiber orientation on strength of these two kinds of composite was investigated. In the case of Zinc-coated steel fiber, the strength of the composite increased linearly with increasing fiber volume fraction, independent of fiber orientation. However, in the case of Zinc-uncoated steel fiber, the strength of the composite with steel fiber parallel to tensile axis increased linearly with increasing fiber volume fraction but the strength of the composite with steel fiber aligned 45 and 90 degrees to the tensile axis decreased linearly with increasing fiber volume fraction.
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2003년 3월 대조기 광양만 부유퇴적물의 유 · 출입에 관한 연구
김석윤,이병관 한국수산과학회 2004 한국수산과학회지 Vol.37 No.6
As a preliminary study on the sediment flux, concentrations of suspended particulate matter and current speeds were measured at three inlets of Gwangyang Bay during one tidal cycle of a spring tide of March 2003. The suspended sediment flux rate (g/m2/s) at the mouth of Seomjin River (St. K1) was observed to be higher throughout surface layer during ebb tide (14.3g/m2/s) and throughout near-bottom layer during the flood tide (23.2g/m2/s), resulting in a net upstream-ward transport of 0.9×103kg/m during 13 period. At the inlet toward Yeosu Bay (St. K2), a relatively low rate (5.0-6.7g/m2/s) of sediment flux occurred throughout the water column compared to St. K1, with a depth-integrated net transport of 5.6×103kg/m toward the outer reaches of Gwangyang Bay inlet. At St. K3 located at Gwangyang Bay-side of Noryang Strait, the outward flux toward the Jinju Bay was observed to be dominant during the flood tide (16.2-23.2 g/m2/s), especially through the mid and near bottom layer, compared to the inward flux throughout the whole water column during the ebb tide (13.1-19.7g/m2/s). The net transport at St. K3 was calculated to be 4.0×103kg/m toward the outside of Gwangyang Bay. The outward net transport of suspended sediment at all three inlets seems to be consistent with a trend of bottom sediment texture, which suggests a net movement of sediment from a relatively coarse and poorly sorted inner-bay toward a relatively fine and better sorted outer-bay environment.
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김석윤,KIM Seok-Yun The Korean Society of Fisheries and Aquatic Scienc 1994 한국수산과학회지 Vol.27 No.6
Suspended sediment distribution and water column processes in the upper Neuse River estuary, North Carolina, were monitored monthly from February 1988 through February 1989, in order to identify the turbidity maximum, to determine its temporal and spatial variation under changing conditions(freshwater runoff, wind, and tide). During most of the observation periods a weak turbidity maximum, associated with the estuarine circulation processes, developed at a flow convergence zone, near the upstream limit of salt intrusion. No turbidity maximum was found when the water column was vertically homogeneous with respect to salinity and when there was no consistent upstream bottom flow. Annual migration of the turbidity maximum, accompanied by migration of salt intrusion, was over 20 km of the upper estuary. Due to the coincidence of dominant wind direction(NE-SW) with the main orientation of the Pamlico-Neuse system, wind played the dominant role in dynamics of the turbidity maximum by influencing the degree of salinity stratification and the extent and strength of estuarine circulation. Tidal effects on the sediment dynamics were negligible.
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