• Journal of Korea Multimedia Society
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• v.15 no.4
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• pp.472-484
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• 2012

Raised or plain block is widely used for the pedestrian's safe passage. The insincere construction, insufficient maintenance and obstacle overlaid on the pavement cause pedestrian's accidents. This paper proposes a method to detect brick path by analyzing the shape pattern and texture feature of brick located in visible distance for a safe passage. A brick appears to a regular type because of its specific shape which repeats with its sized gap and its type varies according to the surrounding environment or use. This paper shows a method which extracts the shape pattern by analyzing single surface polygon and its frequency appearing in road area. The shape pattern is used to detect similar shape regions. Some regions are not detected because extraneous substances or chopped bricks distort the original shape. This problem can be solved by analyzing the texture feature vector. The analyzed vector of the previously detected regions yields the Gaussian distribution. This value in each undetected region is computed and checked whether it's satisfied with Gaussian distribution or not. The satisfied region is detected as the brick path. The experiment was performed with the various type's bricks to recognize so that the results showed as accurate as 95.9% in average.

• Proceedings of the Korea Contents Association Conference
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• 2015.05a
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• pp.269-270
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• 2015

본문에서는 시각장애인의 행위감지 및 공간적 특성과 관련하여, 중국의 시각장애인 보도블록에 대한 조사 연구를 통해 연속성과 안전성 보장을 기초로 안내기능을 융합한 최적화 디자인을 하여야 한다는 점을 제시하고, 시각장애인 보도블록의 기능성을 안정화, 표준화시켜 시각장애인의 외출에 편의를 제공해야 하는 관점을 밝히고 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2009.01a
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• pp.185-188
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• 2009

단일 카메라 영상으로 입력되는 환경 정보에 대해서 보도에 대한 길의 소실점과 보도 영역에 대한 정보를 획득하는 방법과 보도 영역에 대해 블록 세그멘테이션을 통하여 장애물과 같은 물체 영역을 구분한다. 소실정과 보도 영역을 획득하기 위한 방법으로 에지영상에서 보도의 외곽선 정보를 추출하도록 한다. 이를 위해 체인코드를 이용하여 특정한 방향으로 향하는 직선 성분을 검출하도록 한다 보도 영역 내에 존재하는 물체의 영역을 구분하기 위해서 영역을 특정 크기를 가지는 블록으로 구분하고 각 블록이 가지는 평균 컬러 정보를 이용하여 영역을 세그멘테이션 한다. 세그멘테이션을 통해 얻은 영역을 통해 보도의 영역과 장애물의 영역을 구분하고 각 장애물의 위치를 계산하다. 알고리즘의 평가를 위해 실내의 복도 환경과 단순한 형태를 가지는 실외 환경에서 획득한 영상을 이용하여 실험하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.4237-4244
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• 2015

This study examined the efflorescence characteristics of a concrete sidewalk block manufactured using recycled stone powder sludge and photocatalytic generated by surface polishing during the sidewalk block manufacturing process. The study evaluated the characteristics of the sidewalk block in terms of its quality, based on the amount of stone powder sludge used, efflorescence, and further based on the mixing ratio and number of applications of the photocatalytic. The experimental results indicated that heavy metals such as lead, hexavalent chrome, cadmium, and mercury were not present in the concrete sidewalk block, thereby confirming the effectiveness of the recycled stone powder sludge. The optimum mixing ratio of used in the concrete sidewalk block (for satisfying KS standard values such as water absorption ratio and flexural strength) was found to be 20%. The concrete sidewalk block incorporating the stone powder sludge and photocatalytic exhibited a water absorption ratio of 5.4% and flexural strength of 5.2 MPa, thereby satisfying the quality standards. Additionally, when the photocatalytic was used, efflorescence did not occur even at the low temperature of $-5^{\circ}C$, and the by the sidewalk block was found to be 70% under normal conditions and 68% when subjected to an accelerated weathering test.

• Proceedings of the Korean Institute of Landscape Architecture Conference
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• 2017.10a
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• pp.103-105
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• 2017

대구광역시 동구에 위치한 'A'아파트를 중심으로 진입로, 보도, 보차도, 휴게공간, 체육공간의 점토벽돌블록포장, 소형고압블록포장, 인조화강석블록포장에 대해서 발생 하자를 조사하였다. 먼저 하자분석을 위해 하자유형 및 종류를 정의하여 현장조사표를 개발하였으며, 이를 바탕으로 각 공간 및 블록종류에 따른 하자를 조사 분석하였다. 그 결과 진입로의 소형고압블록은 16.14개/$m^2$, 보도의 소형고압블록은 12.04개/$m^2$, 점토벽돌블록포장은 9.55개/$m^2$, 인조화강석블록은 3.66개/$m^2$로 나타났다. 보차도의 소형고압블록은 10.82개/$m^2$, 인조화강석블록은 2.59개/$m^2$, 휴게공간과 체육공간의 점토벽돌블록은 각각 13.64개/$m^2$, 6.02개/$m^2$개의 하자가 발생하였다. 다음으로 블록별 발생하자 종류를 살펴보면, 소형고압블록에서는 골재분리, 인조화강석블록에서는 얼룩이 가장 많았고, 점토벽돌블록은 보도에서는 침하가, 휴게공간과 체육공간에서는 얼룩의 발생량이 많았다. 마지막으로 하자발생부위별로 살펴보면 진입로, 보도, 보차도에서는 경계부의 하자가 많이 발생했으며, 휴게공간에서는 중앙부의 하자가 많이 나타났다. 반면 체육공간에서는 중앙부와 경계부의 차이가 거의 나지 않은 것으로 분석되었다.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.905-905
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• 2012

현재 도시유역의 홍수피해를 경감시키기 위한 방안으로 우수유출 저감시설에 대한 연구가 활발히 진행 중에 있다. 그러나 침투형 우수유출 저감시설의 경우 침투량 산정에 필요한 여러 인자 중 토성에 의해 저감 능력에 많은 차이를 보이고 있으며, 강우시 침투로 인한 토양내 함수비의 변화와 선행강우 조건 등에 의해 정량적인 분석이 어려워 활용도가 미흡한 실정이다. 따라서 본 연구에서는 2009년 국립방재연구원에서 시행한 침투실험 자료의 조건과 동일하게 투수계수 및 형상이 다른 두 종류의 투수성 보도블록 A, B와 토양내 선행강우의 유무에 대하여 표 1과 같이 검증 케이스로 구분하고, 4 가지의 강우강도로 모의 조건을 설정한 후 불포화 투수층의 침투해석을 실시하고 실험결과를 이용하여 모의결과에 대한 검증을 시행하였으며, 모의 결과의 검증을 뒷받침하기 위하여 통계적인 적합도를 나타내는 평균제곱오차(RMSE), 평균편차비율(PBIAS), 모형 효율성 계수(NSE), 지속성 모형효율성 계수(PME)을 산정해 보았다. 검증 결과 그림 1과 같이 투수성 보도블록 B의 형태가 투수성 보도블록 A의 형태보다 적합도가 높게 나타났고, 50mm/hr의 강우강도에서 변동성이 크게 나타났으나, 50mm/hr를 제외한 나머지 강우조건에서 양호한 적합도를 보였으며, 선행강우가 있는 조건이 선행강우가 없는 조건에 비해 높은 적합도를 나타내었다.

• Journal of the Korean Society of Hazard Mitigation
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• v.9 no.4
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• pp.99-106
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• 2009

This research was to estimate quantitative infiltration volume of permeable block which is one of runoff reduction infiltration facilities. In this research, the permeable block experiments estimating infiltration volume for 50, 100, 150, 200 mm/hr rainfall intensity were carried out and hydraulic experiments results were compared with numerical simulation output to produce feasibility of numerical simulation. Final infiltration capacity analysis of permeable block hydraulic experiments reveals that every estimated infiltration volume before runoff beginning was above approximately 300.0 l despite rapid reduction of infiltration ratio and runoff initiation time were occurred in every rainfall intensity. Statistical calculation for coefficient of determination based on cumulative infiltration volume of hydraulic experiment and numerical simulation resulted in a high correlationship as $0.958{\sim}0.996$.

• Journal of the Korean Recycled Construction Resources Institute
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• v.7 no.4
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• pp.423-430
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• 2019

In this study, the flexural strength, absorption rate, methylene blue photo catalyst decomposition performance and anti-fouling performance were evaluated according to the photo catalyst mixing rate and block surface wash status by applying photo catalyst to the surface layer of concrete sidewalk block. The results showed that the flexural strength of the block that mixed photo catalyst only in the surface layer of the concrete block was 5.32MPa of the general block (SNW) of 5% photo catalyst, compared to 5.46MPa of the non-mixed concrete block of the reference concrete block. Surface washing block (SW) 5.26MPa, 10% photo catalyst general block (SNW) 5.26MPa, and 5.15MPa surface washing block (SW). It has been shown that the presence of surface washing and the mixing rate of photo catalyst in the concrete block have no effect on the flexural strength. Moreover, the photoreaction performance of concrete sidewalk blocks showed that the methylene blue removal rate of specimens with 5% TiO₂ was 34.2%, the methylene blue removal rate of specimens with 10% TiO₂ was 37.1%, and the removal rate of the methylene blue of specimens with 5% TiO₂ was about 37.9% and 10% mixed specimens with TiO₂ was about 37.6%.

• Journal of the Korean Geotechnical Society
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• v.31 no.1
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• pp.53-64
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• 2015

This study presents the experimental results of pervious blocks subjected to a series of unique inflow conditions in urban area. The measured properties include the strength, permeability, drainage capacity and runoff, and evaporation for blocks made of two different size of aggregates. Results revealed that the strength satisfies the Korean Standard regardless of aggregate size whereas the immediate runoff occurred for the block with small size aggregate. On the other hand, the block with large aggregates allowed the drainage upon the initial inflow condition, which became hampered to induce the runoff by subsequent inflow. It was attributed to the fact that the capillary water often served as the hydraulic barrier in partially saturated condition. The salient observation indicated that the runoff highly depended on the evaporation and pre-wetting condition as well as the porosity and pore connectivity. The bilinear evaporate rate that makes the degree of saturation vary also had great influence on deterining the time-dependent runoff.

• Journal of the Korean Society of Hazard Mitigation
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• v.9 no.2
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• pp.69-76
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• 2009

Infiltration is the process of water penetrating from the ground surface into soil. Infiltration plays an important role on affecting ground water surface and surface flow during rainy season. The amount of infiltration water would be decreased as the urbanization would increase. Such phenomenons would make streamflow decrease or stream run dry. In this study the cumulative infiltration and the infiltration capacity of ground surface have been determined by the field experiment at three sites in the Hankyong National University, Korea. Three type pervious pedestrian blocks of the cumulative infiltration and the infiltration capacity have also been determined at the same site of the ground surface. It has been shown that one of three type blocks in terms of infiltration capacity is almost same as that of ground surface. The Kostiakov type has been adopted to determine the cumulative infiltration and the infiltration capacity for each site. The Horton type has been also adopted to determine the cumulative infiltration and the infiltration capacity. The value of parameter k for each site is determined and soil type would be identified corresponding to the value of parameter.