• Journal of the Korean Society of Safety
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• v.24 no.5
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• pp.43-47
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• 2009

Armor block is used to reduce wave energy. To do this, the stability of coastal structure is enhanced. It is very expensive to develop a new type armor block. So, the research of new type armor block is very short. We develope truncated tetrahedron type armor block(new type block) which have a hole in center part. In this study, the stability of new type armor block is investigated by hydraulic model test. In the result, the stability coefficient($K_D$) of new type armor block is 11.8. this value is more superior than value of tetrapod.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.33 no.3
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• pp.131-138
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• 2021

The armor blocks are used to protect the body of the structure and dissipate wave energies, so it is crucial to evaluate the stability of the armor unit. The stability of armor blocks has been mainly evaluated through empirical coefficients called the stability coefficient obtained from hydraulic model experiments. In this study, a new type of single-layered armor block called K-Block was proposed, and a new experimental method based on the pull-out force was proposed to evaluate the stability of the armor unit, including the interlocking effects. The pull-out force test proposed in this study directly measures the force required to separate the armor unit from the armored layer on the slope by applying a tensile force in the vertical and horizontal directions to the installed armor unit. The proposed experimental method confirmed that the interlocking effects of the armor block could be quantitatively evaluated, and the high stability of the K-Block was verified.

• Journal of Navigation and Port Research
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• v.48 no.4
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• pp.303-309
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• 2024

This study examines the effects of wave pressure on a vertical wall due to armor block failure at the front of a caisson, using a 2-D hydraulic model to simulate three types of armor block cross-sections. Additionally, the hydraulic characteristics of two cross-sections that replicated the armor blocks' failure, based on complete cross-sections, were compared. Moreover, quantitative analysis indicated that in the cross-section where the displacement of the armor block was recreated, wave run-up( ) increased by an average of 73%, the sum of dimensionless wave pressures increased by 28%, and converted wave force rose by 33%. These findings underscore the need for countermeasures in the event of armor block failure.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2002.08a
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• pp.118-121
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• 2002

항만시설의 기본재료로서 가장 널리 사용되고 있는 피복석 (Rock armor)의 경우 저렴하며, 구입이 용이하다는 장점 때문에 여러 시설물에 적용되어 왔다. 그러나 계속되는 개발로 인해 석재원도 그 한계에 도달했기 때문에 더 이상 저렴한 재료라고 할 수도 없으며, 무엇보다 난 개발로 인한 국토의 훼손과 이에 따른 비난의 여론으로 인해 피복석의 사용이 제한을 받고 있다. (중략)

• Journal of Ocean Engineering and Technology
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• v.20 no.5 s.72
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• pp.70-76
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• 2006

A Probabilistic neural network (PNN) technique for predicting the stability number for the armor blocks of breakwaters is presented. A PNN is prepared using the experimental data of van der Meer and is then compared with the empirical formula and previous artificial neural network (ANN) model. This comparison shows that a PNN can effectively predict the stability numbers in spite of data complexity, incompleteness, and incoherence, and can be an effective tool for the designers of rubble mound breakwaters to support their decision process and to improve design efficiency.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2004.08a
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• pp.160-163
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• 2004

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2008.09a
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• pp.252-255
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• 2008

• Proceedings of the Korea Water Resources Association Conference
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• 2005.09b
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• pp.1301-1302
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• 2005

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2008.09b
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• pp.252-255
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• 2008

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.21 no.5
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• pp.345-356
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• 2009

Tetrapod has been used as the armor blocks of most rubble mound breakwaters constructed in Korea. The Hudson formula has been widely used in the design of breakwater armor blocks in Korea. In the present study, we calculate the load and resistance partial safety factors of the Hudson formula for Tetrapod armors. The partial safety factors were calculated for the typical breakwater cross-sections of 12 trade harbors and 8 coastal harbors in Korea. The mean and standard deviation of them were also calculated. The mean values were compared with the partial safety factors of US Army (2006). The load and resistance factors are slightly smaller and larger, respectively, than the US Army values. However, the overall safety factors obtained by multiplying the load and resistance factors are close to the US Army values. The result of the present study could be used as the basic data to propose authorized partial safety factors in the future.