• 전기전자학회논문지
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• 제18권1호
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• pp.45-56
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• 2014

최근 전 세계적으로 호우, 지진, 태풍 등의 재난으로 인한 피해가 증가하고 있다. 한반도 역시 거듭된 기후 변화에 따라 호우 일수가 매년 증가하고 있으며, 지난 30년간의 지진 통계에 따르면 지진 발생 가능성도 높아지고 있다. 또한 지구 온난화의 심화에 따라 인근 바닷가의 기온 상승으로 강도 높은 태풍이 한반도에 올 가능성이 증대되고 있다. 이처럼 호우, 지진, 태풍으로 인한 재해의 발생 가능성이 증가하고 있으며, 그로인한 수변구조물의 피해와 규모 역시 증가하고 있지만 수변구조물에 대한 피해 정보의 관리가 부족하다. 본 연구에서는 수변구조물 통합관리를 위하여 자연재해로 인한 피해정보를 분류하고, 피해 정보를 표현하기 위한 데이터베이스를 설계하였다. 또한 피해정보 관리 시스템을 구현하여 예제 질의를 수행하여 구현한 시스템의 동작과 가능성을 확인하였다.

• 융합정보논문지
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• 제11권9호
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• pp.8-16
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• 2021

본 연구는 연안 해양에서 워터프론트를 대상으로 발전을 위한 구체적인 정비 방안을 제시하는데 목적이 있다. 연구방법은 해양디자인과 워터프론트, 해양산업, 항만친수공간, 해양경관 관련 보고서, 논문이나 기사 등 각종 자료를 중심으로 진행하였다. 연구결과, 해안가에 설치되어 자연경관을 해치고 생태적 측면에서 시각적 공해가 되는 각종 조형물이나 구조물의 이동 및 철거, 관리가 시급한 것으로 나타났다. 다양한 형상의 등대 또한 가능한 절제된 범위에서 주변 환경과 조화될 수 있으며 사후관리 방안 마련을 전제로 조형적이고 심리적, 미적 감성을 충족시킬 수 있는 조형물이 되어야 할 것이다. 무분별하게 난립된 어장의 위치관리와 정비가 절실하며, 녹색 완충공간을 충분히 확보하고, 전국 연안 해양도로 정비, 생태관광지로 조성하여 지역 활성화에 기여와 생태계 복원으로 인한 수산물의 생산가치 확보를 위하여 갯벌복원이 요구된다. 본 연구는 해양디자인의 무분별한 개발의 측면보다는 워터프론트의 주요 관리 방안에 중점을 두고 정비해나갈 방향을 제시하는데 기여할 것으로 본다.

• 한국지반공학회지:지반
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• 제8권3호
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• pp.37-50
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• 1992

지진으로 인한 액상화현상은 토목구조물에 막대한 피해를 주고 있다. 본 연구에서는 액상화 현상에 대란 대책을 연구할 목적으로 모형 항만구조물을 대상으로 하여 진동대 실험을 실시하였다. 액상화현상으로 항만구조물에 발생하는 과잉변형을 방지하기 위하여 보강구간을 설치하고 그 효과에 대하여 검토하였다. 제방, 이중 널말뚝벽과 앵커 구조물의 진동대 실험을 통하여, 액상화 지반의 유동변형에 대한 특성과 보강범위에 대한 정량적 자료를 얻었다. 항만구조물을 보호하기 위한 보강구간의 범위는 진동가속도의 크기에 따라 다르다. 실험을 통하여 얻어진 구조물의 과잉변형을 보강구간의 범위와 진동가속도의 크기에 따라 나타내었다.

• 한국항만학회지
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• 제12권2호
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• pp.349-362
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• 1998

Seascape means the scenery which is composed around the sea., Seascape has it's own characteristics compared with landscape and has many important roles in our urban life. Nowadays seascape is being destructed by the development in waterfront area and ocean space. Especially the various kind of buildings which are built in coastal area give great visual impact on seascape. But we have rare research on seascape and no guideline for seascape planning. Before any action against destroying seascape the assessment of seascape has to be preceded. The purpose of this study is to evaluate the representative seascapes which are selected from over 300 slides of various seascapes according to the types of seascapes. We used S.D (Semantic Differential) method with 35 adjective pairs in seven scale to evaluate each seascape. The results can be summarized as follows. 1) Seascapes can be classified as natural type and urban type. The natural type can be divided into beach type and rock-island type. 2) Natural type of seascape is more prefered than urban type. 3)Beach type is the most prefered among seascape types. 4) Natural elements of seascape such as sky, water, sand, trees, forest, mountain, open space, waterfront line, are evaluated as 'good' to see but artificial elements, such as buildings, persons, roads, structures, are evaluated 'bad' to see. 5)As a result of factor analysis five factors(axes) are found out. They are 'wildness', 'vividness', 'preference', 'interest', and 'openness'. These factors can be used for evaluting any seascape.

• 한국해양공학회지
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• 제27권3호
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• pp.15-21
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• 2013

Anchors are primarily designed and constructed to resist outwardly directed loads imposed on the foundation of a structure. These outwardly directed loads are transmitted to the soil at a greater depth by the anchors. Buried anchors have been used for thousands of years to stabilize structures. Various types of earth anchors are now used for the uplift resistance of transmission towers, utility poles, submerged pipelines, and tunnels. Anchors are also used for the tieback resistance of earth-retaining structures, waterfront structures, at bends in pressure pipelines, and when it is necessary to control thermal stress. In this research, we analyzed the uplift behavior of plate anchors in clay using a laboratory experiment to estimate the uplift behavior of plate anchors under various conditions. To achieve the research purpose, the uplift resistance and displacement characteristics of plate anchors caused by the embedment ratio, plate diameter, and loading rate were studied, compared, and analyzed for various cases.

• 한국해양공학회지
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• 제26권5호
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• pp.31-39
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• 2012

Anchors are primarily designed and constructed to resist outwardly directed loads imposed on the foundation of a structure. These outwardly directed loads are transmitted to the soil at a greater depth by the anchors. Buried anchors have been used for thousands of years to stabilize structures. Nowadays, various types of earth anchors are used for the uplift resistance of transmission towers, utility poles, submerged pipelines, and tunnels. Anchors are also used for the tieback resistance of earth-retaining structures, waterfront structures, at bends in pressure pipelines, and when it is necessary to control thermal stress. In this research we analyzed the uplift behavior of plate anchors in sand using a laboratory experiment to estimate the uplift behavior of plate anchors under various conditions. To achieve the research purpose, the uplift resistance and displacement characteristics of plate anchors caused by the embedment ratio, plate diameter, and loading rate were studied, compared, and analyzed in various cases.

• Geomechanics and Engineering
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• 제17권5호
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• pp.485-496
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• 2019

Sealing of leakage in waterfront or water-retaining structures is one of the major issues in geotechnical engineering practices. With demands for biological methods as sustainable ground improvement techniques, bioclogging, defined as the reduction in hydraulic conductivity of soils caused by microbial activities, has been considered as an alternative to the chemical grout techniques for its economic advantages and eco-friendliness of microbial by-products. This study investigated the feasibility of bioaugmentation and biostimulation methods to induce fermentation-based bioclogging effect in coarse sands. In the bioaugmentation experiments, effects of various parameters and conditions, including grain size, pH, and biogenic gas generation, on hydraulic conductivity reduction were examined through a series of column experiments while Leuconostoc mesenteroides, which produce an insoluble biopolymer called dextran, was used as the model bacteria. The column test results demonstrate that the accumulation of bacterial biopolymer can readily reduce the hydraulic conductivity by three-to-four orders of magnitudes or by 99.9-99.99% in well-controlled environments. In the biostimulation experiments, two inoculums of indigenous soil bacteria sampled from waterfront embankments were prepared and their bioclogging efficiency was examined. With one inoculum containing species capable of fermentation and biopolymer production, the hydraulic conductivity reduction by two orders of magnitude was achieved, however, no clogging was found with the other inoculum. This implies that presence of indigenous species capable of biopolymer production and their population, if any, play a key role in causing bioclogging, because of competition with other indigenous bacteria. The presented results provide fundamental insights into the bacterial biopolymer formation mechanism, its effect on soil permeability, and potential of engineering bacterial clogging in subsurface.

• 한국환경복원기술학회지
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• 제20권1호
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• pp.55-75
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• 2017

The purpose of this study is to present the basic data for restoration of physical stream environment by analyzing habitat variables because habitat environment is changed due to the construction of waterfront space in urban streams. Assessment results of 10 habitat variables(three divisions) were almost same as optimal condition, in the reach of reference stream where there are no stream crossing structures and channel alteration. Assessment results of reaches in urban rivers, where streams were improved on water-friendly recreation activities, appeared to be marginal condition. Because habitat environment got worse due to stream improvement works such as construction of weir for water landscape, stepping stones for walking, low water revetment and high water revetment, and high water channel. In addition, in the case of mid gradient stream, the frequency of riffles was small or not existed because the intervals of the river crossing structures was short. In the case of mild stream types, the diversity of the pool was damaged due to the deposition of sludge in the upstream pool of weir and the installation of low water revetment.

• 한국해양공학회지
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• 제10권4호
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• pp.149-159
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• 1996

Multipurpose development of the coast and ocean can be considered as multifunction construction combining the functions of coastal protection, waterfront amenity and creation or rehabilitation of habitats. Multfunction development of coastal and ocean spaces can be accomplished by applying the ecosystem control structure of artificial habitats which will cultivate fishing ground with ecological harmony to the coastal protection system. To evaluate the applicability of ecosystem control structures as as fundamental coastal protection structure, wave control function of the structure is studied by numerical and physical analyses. Dimensional analysis and hydraulic experiment point out the importance of width and crest depth of ecosystem control structure, construction water depth and wave steepness. Wave control efficiency is estimated by the attenuation coefficient $(K_H)$ according to wave steepness $(H_0/L_0)$, relative constructed water depth $(h_i/H_0)$, relative berm width $(B/L_0)$ and relative crest depth $(h_B/H_0)$ of eosystem control structure. Empirical fomulas are suggested based on the results of model test by applying the multiple model based on this experimental results and numerical wave shoaling-dissipation-breaking model appears to be valid for the analysis of wave transformation around ecosystem control structure in the coastal waters.

• 한국해양공학회지
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• 제24권1호
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• pp.106-115
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• 2010

This study described the stability of riprap, which was examined by a two-dimensional physical model of a scattered riprap submarine breakwater. Artificial reef structures made of scattered riprap are used like artificial intertidal zone structures as waterfront seaside structures. To prevent topography change in such an artificial intertidal zone the energy is reduced at the scattered riprap submarine breakwater by intercepting high waves. The breaking waves are converted into flow on the front surface slope of the submarine breakwater, which follows the upper part of the artificial intertidal zone. Because of this phenomenon of resisting water flow, it is very important to calculate the required weight of the riprap to maintain its stability. The results of a physical model can be abstracted as shown below. First, distribute the wave breaking types occurring on the front surface slope of the submarine breakwater and arrange it in relation to the movement of riprap. Second, using the hydraulic phenomenon that occurs at the depth of the scattered riprap submarine breakwater, propose a calculation formula for the velocity distribution showing the influence on the stability of the riprap. Third, propose and compare values, which can be obtained by experiments and calculations for riprap stability on the front surface of the artificial intertidal zone. Fourth, calculate the required weight for riprap stability.