• Journal of the Korea Concrete Institute
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• v.28 no.5
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• pp.509-517
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• 2016

In terms of bridge construction, the concrete deck slab is weak members compared to beam members of the bridge supports. Deck slabs must be sound to support and distribute vehicle loads. If slabs are not enough to support the loads, it should be replaced. Bridge deck replacement has been an important industry over the world since the construction is simplified to shorten construction time and to save construction costs. Slab module provides a quickly, easily and reliably construction method in order to avoid high cost and minimum traffic disruption. in addition, slab module shows high reliability since they are factory products. However, slab module should be considered in the performance under various loads. In this study, structural analysis is performed to evaluate the performance of slab module under vehicle loads and temperature loads. Spiral rebar is also utilized around the vertical joints to improve the structural integrity under the lifting loads. In order to confirm the weak area of slab module for the lift condition, numerical analysis has been performed.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.8
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• pp.867-874
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• 2015

Hoist have been installed at wharfs or seashore in the center of fishing village fraternities. A Hoist is used in harbor loading and unloading fishing gear or seafoods and is a device to refloat fishing boats into a breakwater or land in case of typhoon or bad weather. In this paper, we propose image perception and moving objects tracking system that detects boat's damage, theft and trespassing occurred at the wharf. This system detects objects' motion in real time by using the motion templet and tracks to concentrate on a moving object(person, boat, etc.) by using a PTZ camera.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.125-128
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• 2008

In the recent construction industry, external tendon method has been widely used for strengthening and repair of civil structures. This paper presents the strengthening effectiveness and application of the proposed external tendons using lifting hole anchorage system. Based on the experimental results of the previous external tendons using lifting hole anchorage systems, two types of modified systems were proposed. In order to verify the strengthening effectiveness of the two systems, six beams were built and a series of experiments was carried out. To compare and analyze the behaviors of the proposed systems, deflections and strains were measured. Additionally, yield load, ultimate load and failure modes were compared and analyzed.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.12 no.4
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• pp.299-314
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• 2014

A lifting device is used to deal with transport cask for the transportation of spent fuels from nuclear power plants. This study performed theoretical analysis and numerical simulation to evaluate the structural integrity of the lifting device based on Nuclear Safety and Security Commission(NSSC) Notice No.2013-27 and US 10CFR Part 71 ${\S}71.45$. The results of theoretical analysis showed that the maximum stresses of all components were below the allowable values. This result confirmed that the lifting device was structurally safe during operation. The results of finite element analysis also showed that it was evaluated to satisfy the design criteria bothyielding and ultimate condition. All components have been shown to ensure the structural safety due to sufficient safety margins. In other words, the safety factor was 3 or more for the yielding condition and was 5 or more for the ultimate condition.

• Journal of the Korea Convergence Society
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• v.11 no.11
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• pp.135-145
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• 2020

In the era of the fourth industrial revolution, design has developed into a fusion of diversified culture and media. The integration of traditional culture and brand design concepts has become a hot research topic. Chinese Zen thought integrates the thoughts of Laozi and Zhuangzi, and takes" Wu Xiang as the appearance, Wu Nian as the foundation, Wu Zhu as the purpose" as the main purpose to construct a unique Zen thought system that integrates Taoism, Confucian philosophy and aesthetics. From this point of view, the MUJI design that combines Chinese Zen thought and design has attracted much attention. As a traditional culture, how is Chinese Zen Thought reflected in the design of MUJI? Starting from the awareness of this question, this study takes the daily necessities of MUJI as an example to investigate the design features of MUJI that reflect Chinese Zen thought. The conclusion shows that the design features of MUJI with Chinese Zen thoughts are showed in four ways-minimalist style, unitary color, ecological material, and humanized experience.

• Journal of Advanced Navigation Technology
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• v.27 no.3
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• pp.255-261
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• 2023

A main purpose of this research was to analyze environmental factors to influence helicopter accidents contrary to the fact that the almost 80% of helicopter accidents happened due to pilots' human errors. There have been about 14 helicopter accidents in civil aviation sector last decade. It is noteworthy that nine of 14 accidents happened during the external sling load operation. Moreover, there is no law or regulation which could cover the helicopter external sling load operation or human external cargo in Korea. In this paper, it was analyzed the training and education regulations regarding helicopter external sling load operation or human external cargo in regulations of FAA and EASA, Based on analyzing and comparing the FAR part 133 and domestic aviation law (aviation safety act and flight safety regulations), it was found out the implication how to apply helicopter type rating for external sling load operation and human external cargo operation. To sum up, this paper expect central government should cooperate and amend aviation law which apply external sling load operation and external cargo to establish sound safety culture in Korea.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.147-147
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• 2018

• Proceedings of the ESK Conference
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• 1994.04a
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• pp.52-63
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• 1994

산업현장에서 산업재해의 주요한 요인이 되는 중량물 수운반 활동시 작업자가 안전 하게 작업을 행하면서도 최적허용중량을 결정하기위한 연구는 주어진 작업조건하에 서 인양되는 최대중량을 결정하기 위한 기준으로서 척추에 가해지는 압력을 이용하는 생체역학적 접근법, 주어진 작업조건하에서 인양되는 최대중량을 결정하기 위한 기준 으로서 에너지 소모량을 이용하는 생리학적 접근법, 주어진 작업조건하에서사람이 인 양할 수 있는 최대중량을 결정하는 기준으로서 피실험자에의해서 인지되는 힘든 정도를 이용하는 정신물리학적 접근법 등으로수행하여 왔다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.11a
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• pp.18-20
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• 2023

부표류 이설을 위한 필수 공정인 표체 권상작업을 생략하여, 중대 인명사고 개연성이 있는 유해·위험요인(중량물 낙하, 깔림 등) 제거를 통해 안전한 항로표지 작업환경을 도모하고자 방안을 공유함.

• Monthly Newsletter
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• no.203
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• pp.3-3
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• 2004