• 수산해양기술연구
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• 제42권3호
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• pp.179-185
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• 2006

In order to efficiently manage the coastal and offshore fishing ground, the applicability of real-time monitering was also investigated through a wide-area network of automatic identification system(AIS). The experiment of efficiently managing coastal and offshore fishing ground with a wide-area network of AIS required, on the headquarter's screen, a synthetic display of vessel information transmitted from three different distant stations. This experiment tested the applicability of real-time monitoring with the shown display. The maximum range of detection of the first station in Busan was 24 nautical miles while those of the second and third stations in Yeosu and Jeju were 26 and 52 nautical miles, respectively.

• 해양환경안전학회지
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• 제22권2호
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• pp.187-194
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• 2016

본 연구에서는 하구 염습지 생태계 복원 및 조성을 위한 기초적 연구로서, 낙동강 하구 사주섬인 진우도에 서식하는 갈대의 서식환경 특성을 파악하기 위하여 저질의 함수량, 입도분포, pH, 영양염 농도($NH_4-N$, $PO_4-P$), 지하수위, 지반고, 갈대 개체수 및 최대 높이 등의 조사를 실시하였다. 조사결과 연구대상 지역의 저질 입경 및 함수량이 갈대 서식환경에 미치는 영향은 적은 것으로 나타났으며, pH는 식생대와 비식생대 정점의 차이가 없었고, $NH_4-N$와 $PO_4-P$ 농도도 정점별 차이가 없었다. 식생대 영역에서 해안선 쪽으로 갈수록 지반고가 낮으며 개체수는 감소하였고, 지하수위는 높게 나타났다. 따라서 낙동강 하구 염습지의 갈대서식 환경에 영향을 미치는 주요인자는 지반고와 지하수위가 크게 기여하는 것으로 나타났다.

• 한국지반공학회논문집
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• 제19권5호
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• pp.301-310
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• 2003

저치환율 샌드콤팩션파일공법(SCP공법)을 합리적으로 설계하기 위해서는 압밀중에 발생하는 복합지반 내부의 모래말뚝과 점토 양자의 상호역학거동을 정확히 파악하고 그 메커니즘을 이해하여야 할 필요성이 있다. 본 논문에서는 저치환율 SCP공법에 의해 개량된 복합지반의 압밀중에 발생하는 역학적 상호작용을 규명하기 위하여 일련의 수치해석을 실시하였다. 수치해석은 탄점소성 압밀 유한요소법을 적용하였으며, 그에 대한 신뢰성은 SCP에 의해 개량된 복합지반의 압밀거동에 대한 일련의 모형실험 결과와의 비교를 통해 검증할 수 있었다. 또한, 수치해석의 결과들로부터 저치환율의 모래말뚝이 타설된 복합지반의 모래말뚝과 점토에 대해 압밀중에 발생되는 각각의 역학거동과 복합지반 내부에 대한 응력분담 메커니즘에 대하여 규명하였다.

• Spatial Information Research
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• 제16권3호
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• pp.373-383
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• 2008

지표면에 대한 정보를 취득하는 기법 중 지금까지 주로 사용되어온 기법은 항공사진 및 위성영상과 같이 평면적인 정보 수집에 중점을 두고 있는 반면, 본 논문에서 다루는 LiDAR(Light Detection And Ranging)는 레이저 측량기술을 이용하여 지표면에 대한 고해상도의 비정규분포 Point 형태의 3차원 정보의 획득이 가능하다. GPS(Global Positioning System) 수신기와 INS(Inertial Navigation System)의 결합을 통해 좌표 값을 제공하게 된다. 이러한 LiDAR의 3차원 Point 정보와 좌표 값을 활용하여 보다 정밀한 3차원 모델링 수행이 가능하다. 본 연구에서는 LiDAR의 반사강도와 기하/지형 자료를 이용하여 도시지역을 대상으로 정밀한 3차원 공간정보자료를 취득하고, 그 자료를 분석하여 도시지역을 높이와 밀도를 기반으로 하여 3차원으로 분류하였다. LiDAR를 통해 획득된 원시자료로부터 지표면에서 반사되는 Point Data의 개수를 지면과 비지면 요소의 비율로 추정하여 지형과 공간적 특성을 파악하고 이에 따라 3차원 토지피복분류도를 작성하였다. 신호의 강약을 구분하는 기준은 통계적 방법(Jenk's Natural Break)을 통해 추정된 값을 사용하였으며, 지표면 반사비율에 따라 세부지역으로 구분하여 크게 고밀도 저밀도 식생지역과 비식생지역으로 구분하였다.

• 한국조경학회지
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• 제18권4호
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• pp.7-16
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• 1991

This research investigated soil, plants, insects and birds in the Mongchon Earth Fort, establishing the 11 plots, according to planting treatment, in order to present management method for ecological stability of species in the ground covering plots. The results of analysizing the investigated data summarize as follows. 1. In the ground covering plots without upper layer, the density and coverage of middle and low layer in the natural plots were higher than those in the artificial plots. 2. In the ground covering plots without upper layer, the density and coverage of low layer were higher than those in the artificial, while the density and coverage of herb layer in the natural plots were lower. 3. Whether there was upper layer or not, the total species diversity and enenness of the ground covering community in the natural plot without artificial treatment and natural treatment plot were higher than those ground covering. 4. In the ground covering plots with upper layer, the species diversity of ground covering in the plots without artificial treatment is high, while the species diversity in the plots with natural treatment caused the secondary succession is higher than that of the natural plot. 5. In the ground covering plots without upper layer, the species diversity in the plots with artificial management was higher than that of natural plots, while the evenness in the plots with artificial management was lower. 6. In the ground covering plots with upper layer the species diversity of insect in the plot of natural state was higher than that of insect in the plots with artifical treatment. 7. Synthetically, in the area with upper layer the species diversity of the ground covering community in the natural plot was high, while in the area without upper layer, the species diversity of it in the plots with artificial treatment was high. The insect turned up frequently in the plots of high species diversity of the ground covering, so the bird did in the plots of high species diversity of the ground covering and insects.

• Physical Therapy Rehabilitation Science
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• 제11권4호
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• pp.421-429
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• 2022

Objective: The purpose of this study was to compare and analyze the effects of arch support taping on static balance, static/dynamic foot contact area, and ground reaction force during walking according to the types of elastic tapes with mechanical elasticity differences. Design: Cross-sectional study Methods: Twenty-six participants selected for flexible flat feet through the navicular drop test were randomly assigned to non-taping, Dynamic-taping, and Mechano-taping conditions. Static balance and foot contact area were compared in the standing posture according to arch support taping conditions, and foot contact area and ground reaction force were compared during walking. Results: There was no significant difference in static balance according to the taping condition in the standing position, but the foot contact area in the Mechano-taping condition showed a significant decrease compared to the non-taping condition (p<0.05). The foot contact area during walking significantly decreased in the Dynamic-taping and Mechano-taping conditions (p<0.05), but there was no significant difference between the ground reaction force. Conclusions: Based on the results of this study, it was confirmed that among the types of elastic taping, arch support taping using dynamic taping and Mechano-taping has the effect of supporting the arch with high elastic recovery. Any type of elastic tape can be used for arch alignment in flexible flat foot.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.982-989
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• 2005

In this study, a series of laboratory tests based on 'Unit-cell concept' are performed to investigate improvement characteristics of clay ground in sand compaction pile method. Settlement reduction characteristics of composite ground and improvement characteristics of clay part could be qualified. In these procedure, the new strain-compression index($C_{\epsilon}$) of composite ground are adopted to show compressibility of composite ground according to the area replacement ratio, which is similar to the compression index($C_c$) in pure clay ground. Also, using normalization of reduction of water content in composite ground to the initial water content, improvement characteristics of clay part are investigated.

• 터널과지하공간
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• 제27권6호
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• pp.377-386
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• 2017

본 연구는 1990년대부터 국내에서 처음으로 시작된 폐광산 지역 지반침하방지기술을 정리하고 향후 지반침하방지기술의 발전방향을 모색해보고자 하였다. 먼저 지반침하의 개념을 정리하고, 지반침하 조사기술, 안정성 평가기술, 보강기술, 계측기술 등 각각의 적용기술을 설명하였다. 현재의 어려운 사업상황을 극복하고 지반침하방지 기술을 발전시켜 나가기 위하여서는 먼저 현재까지 개발된 기술을 통합정리 하고, 공공기관과 민간전문 사업자가 상호 긴밀히 협력하여야 한다. 그동안 다양한 시행착오를 거쳐 발전된 기술을 터널굴착, 토목기반시설물 건설, 지하 환경영향 평가 등과 같은 관련 산업분야에 적용하여 사업영역을 확장해 나가는 것이 필요하다. 또한 좁은 국내시장을 벗어나 그동안 축적된 기술로 해외시장을 개척하여 나아가야 할 것이다.

• 한국농공학회논문집
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• 제47권6호
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• pp.47-57
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• 2005

Stress distribution in soils is the very important element to design and to solve the problems of settlement, safety of foundations and trafficability of constructing vehicle in civil engineering. This research presents the comparative estimation of the actual and theoretical measurement on the underground stress of outer layer for each soil after the observation of each top soil layer fur its vertical and horizontal stresses in (1) homogeneous sand ground (2) weak stratum with the sand soil (3) weak stratum with gravel of the soil model, and it also investigates the effect of subsidence of ground by the repeated load. The underground stresses fumed out to be different in the value of theoretical and actual measurement after the trial examination of model. This study has the purpose of suggesting the better construction method of running equipment on weak stratum by comparing the estimated value of trial experiment and theory on underground stress of the weak ground surface area and of raising up the necessity of the continuous research hereafter.

• Geomechanics and Engineering
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• 제30권3호
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• pp.273-280
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• 2022

A certain amount of random vibration excitation to subway track is caused by subway operation. This excitation is transmitted through track foundation, tunnel, soil medium, and ground building to the ground and ground structure, causing vibration. The vibration affects ground building. In this study, the results of ANSYS numerical simulation was used to establish back-propagation (BP) neural network model. Moreover, a back-propagation neural network model consisting of five input neurons, one hidden layer, 11 hidden-layer neurons, and three output neurons was used to analyze and calculate the vertical Z-vibration level of New Capital's ground buildings of Qingdao Metro phase I Project (Line M3). The Z-vibration level under different working conditions was calculated from monolithic roadbed, steel-spring floating slab roadbed, and rubber-pad floating slab roadbed under the working condition of center point of 0-100 m. The steel-spring floating slab roadbed was used in the New Capital area to monitor the subway operation vibration in this area. Comparing the monitoring and prediction results, it was found that the prediction results have a good linear relationship with lower error. The research results have good reference and guiding significance for predicting vibration caused by subway operation.