• Journal of Navigation and Port Research
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• v.36 no.6
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• pp.443-448
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• 2012

As a basic data to build a countermeasures against coastal disaster, the conscious survey of people living around the coastal are is needed. This study performed the conscious survey on 5 islands located at Korean southeast ocean including Youngdo of Busan. Among many respondents, 503 effective answers are got and followings are the analyzed results. Among the various kinds of disasters, especially the typhoon(28%), storm surge(19%), earthquake(15%) are selected as menacing disasters in mind to coastal inhabitants. Typhoon(60%) and storm surge(21%) were the representative disasters that the coastal inhabitants experienced. 67% among the respondents get the disaster-related information from TV and/or commercial medias, and other 21% depend on their own experiences. Although 33% of respondents attended the disaster-related training and the training time was less than 2 hours, they answered the training was very helpful. Over 85% among the respondents answered they will evacuate if a disaster occur, but only 19% know the evacuee shelter(s). Except the foods, various living goods are selected and willing to carry with for living at shelter if they have to evacuate.

• Journal of the Speleological Society of Korea
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• no.51
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• pp.15-18
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• 1997

제주도는 한반도 남방 해상에 해당하는 120$^{\circ}$ 16'~126$^{\circ}$ 57'에 위치하는 화산섬이다. 이 섬의 동북지방에 있는 만장굴은 북제주군 구좌읍 동금녕리에 위치하며 오늘날 화산동굴로는 세계 제5위에 해당하는 8,924m의 화산동굴(용암굴)이다. 실지로 이 만장굴을 중심으로 산위로 또는 산밑해안가로 뻗고 있는 같은 화산 활동시기에 같은 용암류가 형성시킨 많은 동굴들(김녕사굴, 밭굴, 전굴 그밖에 개우샛굴, 덕천굴 등)을 포괄시킨 만장굴 동굴시스템(동굴계)로 따지면 실로 세계 제일가는 협재동굴시스템(11,749m) 다음가는 세계 제2의 화산동굴시스템(13,268m)으로 현재까지 국제적인 인정을 받고 있는 동굴군이다.(중략)

• Journal of Korean Society of Forest Science
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• v.18 no.1
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• pp.23-33
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• 1973

The survivals of loblolly pine, Pinus taeda L. was gradually increased from southeast to northwest in the species range and the provenances from southeast of the species range showed fast growth rate. It is suggested that the loblolly pine from Arkansas and Texas will be good for inland of Korea, and the trees from Maryland and North Carolina Piedmont will be suitable for the west coastal and east coastal region of Korea, and trees from North Carolina Coastal Plain will be promising one for south coastal region of Korea.

• JOURNAL OF ELECTRICAL WORLD
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• no.6 s.2
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• pp.33-38
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• 1974

우리나라 남${\codt}$서해안선의 총 연장은 5,000천에 달하며 크고 작은 섬들만도 2,000여개가 산재하고 있다. 여기에 밀려드는 조석 및 파력에너지의 포장량은 전력으로 환산하여 줄잡아 $10^{8}KW$ Order의 ''이론적 포장에너지량''이 부존하고 있다고 생각된다. 수력의 경우 구주각국이나 일본에 있어서는 ''기술적 포장수력''의 $25{\~}50{\%}$가 ''기술적 포장수력''으로, 그리고 $10{\~}20{\%}$가 ''경제적 포장수력''이라는 통계치가 나와 있다. 조력의 경우 이와같은 수치를 그대로 적용할 수는 없겠지만, 수천만kw Order의 기술적 또는 경제적 포장능력이 우리나라 남서해안에 부존할 수 있음에 수긍이 간다. 이론적으로 포장량을 기술적 포장량으로 바꾸고 이를 다시 실현성있는 경제적 포장량화하는 원동력은 인간의 지혜 곧 ''기술''과 역사의 흐름 곧 ''시운''에 좌우된다고 하겠다. 정부는 국내 부존에너지자원의 활용 극대화를 위하여 ‘74년도 우리나라 서해안의 조력발전기초조사를 과학기술처 산하 ${\ulcorner}$한국해양개발연구소${\lrcorner}$를 중심으로 하여 실시하게 된다. 국내 관계기관 및 전문가들의 적극적 참여와 협조를 바란다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.02a
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• pp.145-150
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• 2002

본 연구는 국내에서의 지역별 풍력자원을 조사하여 자연에너지인 풍력을 활용하고자 기상청의 기상 관측소 자료를 이용하여 분석하였던 바, 다음과 같이 요약 할 수 있다. 가. 평균풍속의 분포를 보면 제주고층이 10.8m/s로 가장 높았고, 순천이 0.6m/s로 가장적게 나타난 것으로 일반적으로 해안가나 내륙고산지대에서 높은 풍속을 보였다. 나. 풍속지속시간을 보면 대부분의 지역에서 3.0m/s 이상, 연간 5,000시간이상으로 나타나 풍력의 이용가능성을 알 수 있었다. 다. 풍력 에너지 밀도는 인천 142kWh/m$^3$, 제주도 400kWh/m$^3$, 대관령 280kWh/m$^3$, 울릉도 140kWh/m$^3$, 목포 200kWh/m$^3$및 군산 180kWh/m$^3$높게 나타났다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.16 no.4
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• pp.191-195
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• 2004

This study investigated the effect of deep-sea environment on the compressive characteristics of polymer matrix composite. The specimens used in the experiment were thick Carbon-Epoxy composites that were made from Carbon-Epoxy prepregs. The specimens were immersed into seawater for thirteen months. The seawater content at saturation was about 1.2% of the specimen weight. The hydrostatic pressures applied were 0.1 MPa, 100 MPa, 200 MPa, and 270 MPa. It was found that the compressive elastic modulus increased about 10% as the hydrostatic pressure increased from 0.1 MPa to 200 MPa. The modulus increased additional 2.3％ as the pressure increased to 270 MPa. It was also found that compressive fracture strength and compressive fracture strain increased with pressure in a linear behavior. Compressive fracture strength increased 28％ and compressive fracture strain increased 8.5％ as the hydrostatic pressure increased from 0.1 MPa to 270 MPa.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.3 no.4
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• pp.255-260
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• 1991

A voltage measuring system specified for the voltage fluctuation of the Pusan-Hamada submarine cable is developed by adding circuits of differential amplification and analog-to-digital conversion to a microprocessor-based data logger with a data modem. This system is charaterized by its small size. no power failure. fully unmanned operation. and precise instrumental drift correction. In addition to the cable voltage and current it measures an ambient temperature and a mercury cell voltage in order to calibrate temperature effect and check its long-term stability. The data acquired by this system show that the voltage signal. comprising fast random noises with a constant width of about 0.2V. fluctuates within a range of about 1V and the fluctuation frequency is similar to that of tidal motion. The source voltage of power feeding equipment (PFE) for the cable system seems to be affected when the room temperature changes rapidly.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.4 no.2
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• pp.91-107
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• 1992

A numerical formulation is developed to solve the linear three-dimensional hydrodynamic equations which describes wind induced flows in a homogeneous shelf sea. The hydmdynamic equations are at the outset separated into two systems. namely, an equation containing the gradient of sea surface elevation and the mean flow (external mode) and an equation describing the deviation from the mean flow (internal mode). The Galerkin method is then applied to the internal mode equation. The eigenvalues are determined from the eigenvalue problem involving the vertical eddy viscosity subject to a homogeneous boundary condition at the surface and a sheared boundary condition at the sea bed. The model is tested in a one-dimensional channel with uniform depth under a steady, uniform wind. The analytical velocity profile by Cooper and Pearce (1977) using a constant vertical eddy viscosity in channels of infinite and finite length is chosen as a benchmark solution. The model is also tested in a homogeneous, rectangular basin with constant depth under a steady, uniform wind field (the Heaps' Basin of the North Sea scale).

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.9
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• pp.68-75
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• 2017

This paper presents the experimental and theoretical results of the dynamic responses of a pendular energy extractor in a two-dimensional wave channel. By adopting a wave maker with varying wave height and period, the dynamic responses of the pendular buoy were experimentally obtained. Furthermore, with the aid of the co-simulation of moving particle analysis and rigid dynamic analysis, the dynamic responses of the pendular system were evaluated. In order to validate the feasibility of the proposed wave power generator, the force tuning of the pendular system with restoring energy was carried out. The results provide proof of concept data for the development and design of a commercial model for horizontal wave power generators in the shoreline area.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.6 no.1
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• pp.40-50
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• 1994

For an accurate prediction of the temperature field induced by heated water discharged into a shallow crossflow, a two-dimensional near-field numerical model is developed. It is based on a 4-equation turbulence model in which the transport equations for mean of the temperature fluctuation squared and its dissipation rate are added to those of a 2-equation turbulence model which cannot give the information of the thermal time scale ratio. Vertical diffusion is also considered by including buoyancy production and turbulence heat flux terms. The developed model is applied to a steady flow in an open channel with simple geometry and the results are compared with existing experimental data and those of the already established 2-equation turbulence model. Numerical results of the model agree with the experimental data better than those of the 2-equation model. The present model also simulates quite adequately the physical characteristics of thermal discharge in the jet entrainment and stable regions.