• Proceedings of the Korean Society for Information Management Conference
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• 2014.08a
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• pp.11-15
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• 2014

과학기술 학술활동은 원천기술 확보의 기반인 기초연구를 강화하기 위한 핵심요소이다. 논문과 학술지는 학술 커뮤니티에서 사전 연구기획과 사후 결과 활용의 핵심 수단으로써 중요한 기능을 담당하며 과학기술과 함께 발전해 왔다. 따라서 학술지 종수와 논문 발표 건수, 피인용 현황은 해당 주제 분야의 동향을 파악하는데 매우 중요하다. 이 연구에서는 최근 11년간 JCR 과학기술 주제분야(176개)별 논문 편수와 피인용도 증감 변화를 조사하여 새로운 주제분야(학문)의 생성과 성장가능성을 살펴 보았다.

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.138-138
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.281-281
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.279-279
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.280-280
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.283-283
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• 2017

• Journal of the Society of Naval Architects of Korea
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• v.49 no.4
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• pp.333-339
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• 2012

The main objective of the present study is to investigate the roles of the micro-dimpled surface on the drag reduction. To investigate the effectiveness of the micro-dimpled surface, the flat plates are prepared. The micro-size dimples are directly carved on the metal surface by ultrasonic nano-crystal surface modification (UNSM) method. Momentum of the main flow is increased by the dimple patterns within the turbulent boundary layer (TBL), however, there is no significant change in the turbulence intensity in the TBL. The influence of dimple patterns is examined through the flow field survey near the flat plate trailing edge in terms of the profile drag. The wake flow velocities in the flat plate are measured by PIV technique. The maximum drag reduction rate is 4.6% at the Reynolds number of $10^6{\sim}10^7$. The dimples tend to increase the drag reduction rate consistently even at high Reynolds number range.

• Ocean and Polar Research
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• v.39 no.3
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• pp.205-211
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• 2017

This paper seeks to provide a dynamic analysis of a 150 ton winch based on ocean environmental data. The winch model that was subjected to analysis was modeled from CAD to each subsystem by the commercial software DAFUL. The winch model has tree brake systems (disk brake, band brake and ratchet brake). The rotation motion of the motor and contact elements of the brake are applied to the winch model in order to analyze its dynamic characteristics. In addition, a crane-barge was modeled to apply ocean environmental data. The motion data of the crane-barge was produced by means of the RAO(Response Amplitude Operator) of the barge and wave spectrum. The reaction force of the translational joint was measured instead of the tension of the cable. The brake performance of the winch was produced and assessed based on the operating motion of the crane-barge.

• Journal of the Korean Geosynthetics Society
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• v.15 no.3
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• pp.39-47
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• 2016

In order to prevent leakage of leachate in offshore landfill, hydraulic barrier is indispensable. In the case of rubble mound revetment at offshore landfill, HDPE sheet in slope should be installed. In this study, seepage analysis were performed to evaluate seepage and flow in the seabed and revetment according to extended length of HDPE sheet by using SEEP/W. Results show that, in the case of low permeability layer is distributed where extended length of HDPE sheet was more than 1m, seepage flux in seabed and revetment was greatly reduced. In order to prevent seepage in seabed and revetment in the case of sand layer of high permeability is existed above low permeable layer, extended length of HDPE sheet and impermeable improvement width of permeable layer should be more than 1m at seabed.

• Korean Journal of Environmental Biology
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• v.33 no.1
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• pp.27-33
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• 2015

Fish assemblages in the coastal waters off Gampo in the East Sea of Korea were analyzed using the samples of fishes collected with bottom trammel gill nets June, September, and December 2005 and, March 2006. During the study period, a total of 32 fish species, 695 individuals, and 180,012.0 g representing 21 families were collected. The fish assemblages predominantly consisted of Ditrema temminckii, which accounted for 52.4% of the number of individuals and 40.4% in the biomass. The next major specimens were Hexagrammos otakii, Sebastes schlegelii, Stephanolepis cirrhifer, Sebastes taczanowskii, Halichoeres poecilopterus. These six fishes accounted 77.6% of total number of individuals and 77.5% of total biomass. The number of fish species, the number of individuals and biomass were fluctuated with month. The number of species was highest in June 2005 and lowest in March 2006. The number of individuals and biomass was highest in September 2005 and lowest in June 2005.