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A Review of Sediment Dynamical Processes in the West Coast of Korea, Eastern Yellow Sea
이희준 한국해양과학기술원 2014 Ocean science journal Vol.49 No.2
Sediment dynamical processes began to be systematically monitored in the west coast of Korea facing the eastern Yellow Sea in the 1990s. The early investigations were largely conducted aboard vessels that provided results where the resolution was highly restricted in both temporal and spatial aspects. However, full-fledged autonomous instruments introduced early in the 2000s allowed for a quantum leap in the level of this sub-field of sedimentology. The investigated sites include various environments such as estuaries, bays, tidal flats, beaches, and offshore deposits. Among them, a total of seven sites were selected for the review: Han estuary, Daeho tidal flats, Garolim Bay, Saemangeum Region, Byunsan Beach, Gomso Bay, and Huksan Mud Belt. The major results from each site were briefly summarized. The summary clearly demonstrates that wind-generated currents and waves particularly during winter should be carefully considered in interpreting sedimentary environments. This is because winter-season processes interrupt or actively displace much of the sediments worked by tidal currents in the remaining seasons. The summary hence suggests that seasonal investigations of sediment dynamics are necessary to understand shallow-water sedimentation in the west coast of Korea that is governed complicatedly by two major forcing agents: waves and tidal currents.
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이희준,Lee, Hui-Jun 선박안전기술공단 2005 선박안전 Vol.20 No.-
본 논문은 선박검사기술협회가 한국해사재단으로부터 위탁받은 "도선업무에 적합한 도선선 모델개발"의 결과로 지난 4월 1일부터 10월 30일까지 총 7개월간 도선선의 적정 규모와 선형, 경제성 분석 및 도선사의 안전을 위한 각종 장비에 대해 연구한 결과이다. 이번 연구는 국내 해양물류의 중요한 역할을 담당하고 있는 도선사들의 안전과 효율적 도선선 운영에 대한 국내 최초의 연구로서의 의미와 향후 국내 특수 선박들에 대한 연구 필요성을 확인할 수 있었다.
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이희준,이승욱,차귀수 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.1
This paper presents the design and test results of a 10kVA single phase HTS transformer which is operating at 77K. Double pancake windings with BSCCO -2223 HTS tape and GFRP cryostat with room temperature bore are used in the transformer. Four double pan cake windings were used in total. Two double pancake windings are connected in series to provide 188 turns and other double pancake windings are connected in parallel to conduct the secondary current of 45.4A. The rated voltages of each winding are 440/220V. Numerical calculation using Finite Element Method was used to evaluate the performance of each arrangement. Considering the magnetizing reactance, leakage reactance, electrical insulation and the circulating current in low voltage winding which had two windings in parallel, HLLH arrangement was finally chosen. Estimation of the AC loss, magnetizing loss and self field loss, in the superconducting winding and the iron loss in the core were given. Magnetizing loss is calculated in the design stage, where effects of perpendicular field and parallel field are considered. Room temperature bore type cryostat has been constructed and its heat loss was measured. Coefficients of the constructed transformer are obtained using the fundamental tests of the transformer. According to the test results, larger leakage reactance than expected is observed due to the bulky core which surrounded the cryostat.
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충남지역의 초기 성당건축에 관한 연구 : 개화기~일제강점기까지 건립된 성당을 중심으로
이희준,김현석,이달훈 大田大學校 産業技術硏究所 2002 산업기술연구소 論文集 Vol.13 No.2
The object of this study is to suggest worth of the historical and the need of preservation, and to find out architectural characteristics and types of the Early Catholic Church architecture between 1886~1945 in Daejon - Chung-Nam province. The results of this paper are summarized as follows. 1. Most Catholic Church was designed and built by French missionary. 2. Most Catholic Church has followed the Gothic Style. 3. Prototype of floor plan was Rectangular type and Latin Cross type. 4. Main material of church building structure was almost brick, but with coming later in 1930, brick and reinforced-concrete were used together.
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이희준 한국해양과학기술원 2015 Ocean science journal Vol.50 No.4
The Huksan Mud Belt (HMB) has been extensively investigated with respect to its source and evolution since the 1980s. Studies on sediment budget or accumulation rates suggested two different origins, Korean and combined Korean and Chinese. However, neither of the suggested origins appears reliable because they were based on insufficient or inaccurate datasets on the basic sedimentological characteristics of the HMB. Although a major mud transport was inferred to be closely associated with either the Korean Coastal Current or the Yellow Sea Warm Current, their physical characters during the Holocene transgression have been rarely hind-casted thus far. The majority of studies on high-resolution seismic stratigraphy along with core log have suggested that the HMB stratigraphy consists of two units divided by an erosional boundary. The lower unit is further divided into two subunits by a subtle discontinuity that is laterally correlated with the erosional boundary. In line with the stratigraphy, the studies theorized that the erosion of the HMB had produced a re-deposited distal lobe, the younger lower subunit. In addition, this lobe was inferred to have prograded rapidly during the relatively short period of 6,500−5,500 yr B.P. Although the time interval of the erosion coincides with the decelerating rise in sea level, the hydrodynamic cause and effect of the erosion remain inexplicable. Therefore, the source and evolution of the HMB continue to be controversial, due largely to poor understanding of the paleo-physical oceanography of the Yellow Sea during the Holocene.
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이희준,구현모,이기동,Lee, Hui-Jun,Gu, Hyeon-Mo,Lee, Gi-Dong 선박안전기술공단 2006 선박안전 Vol.21 No.-
선박검사기술협회는 레저선박 검사수임을 위하여 2003년부터 3년간의 자체연구개발 계획을 수립하고, 1차년도 수상레저안전관리에 관한 연구(2003), 2차년도 레저선박 특수안전기준에 관한 연구(2004)에 이어 최종적으로 레저선박검사 가이드북 개발(2005)을 수행했다. 이는 레저선박의 기술∙선진외국의 레저선박 검사기준 검토에 이어 국내 실정에 맞는 레저선박 검사실무에 맞춤형 연구개발을 수행을 목적으로 하였으며, 본문은 2005년 12월에 종료한 레저선박 검사 가이드북 개발 연구에 대한 요약본이다.
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