• 한국해양공학회지
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• 제33권6호
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• pp.597-606
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• 2019

Due to climate change, coastal areas are being flooded with torrential rain, typhoons, and tsunamis. In addition, non-point source pollutants (NPSs) that accumulated on the ground, streets, and buildings during the dry season are washed off by rain and stormwater runoff, which adds to the damage associated with environmental pollution, e.g., pollution that makes its way into the ocean. Recently, low impact development (LID) has been considered as a means of controlling water circulation and NPSs. In the coastal area, permeable blocks have been constructed mainly to reduce the flood damage caused by waves. Some important design factors that must be considered to ensure long-term performance are the permeability coefficient, clogging, and the efficiency of the removal of total suspended solids (TSS), but currently there are no standardized design criteria or testing techniques that are used worldwide. Herein, we analyzed the permeability coefficient and the TSS removal efficiency tendency according to the permeability area ratio with an easily-detachable, permeable block filled with calcinated yellow soils as the filter media. Our lab-scale tests indicated that, when the permeability area ratio was 25%, the reduction of the permeability coefficient after clogged was 11%, which was a significant decrease compared to other cases. Permeability persistence increased when the permeability area ratio increased from 50% to 75%. The TSS removal efficiency decreased as the permeability area ratio increased. Our pilot-scale test indicated that the TSS removal efficiency was more than 80% higher in all cases. We also found that the permeability persistence was excellent as the permeability area ratio increased, and, in actual construction, it is effective to set 5.3% of the total area as permeable area in terms of permeability and economic feasibility.

• 한국멀티미디어학회논문지
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• 제15권4호
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• pp.472-484
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• 2012

보행자의 안전한 보행을 위해 점자형 또는 일반 보도블록이 널리 쓰이고 있다. 불량한 시공 및 유지상태와 장애물은 보행자의 사고를 유발한다. 본 연구는 안전한 보행을 위해 영상에서 가시거리에 위치한 블록의 형태 패턴과 텍스처 특징을 분석하여 보도블록을 검출하는 방법을 제안한다. 보도는 특정모양의 블록이 일정 간격에 반복 배치되어 규칙성을 띄며, 주변 환경 또는 용도에 따라 그 형태는 다양하다. 높은 빈도를 띄는 단일 모양의 다각형을 분석하여 형태 패턴을 추출한다. 일부영역은 이물질 또는 조각난 블록이 원래의 형태를 왜곡시켜 검출되지 않는다. 이 문제는 텍스처 특징벡터 값을 분석하여 해결한다. 앞서 검출된 모든 영역에 대해 분석된 텍스처 특징벡터는 가우시안 분포를 나타내고, 미검출 영역에 대해 분석한 텍스처 특징벡터가 가우시안 분포를 만족하는지 판단한다. 만족된 영역은 보도블록으로 검출한다. 본 실험은 다양한 형태의 보도블록을 인식하였고 95.9%의 정확성을 보였다.