• KIEAE Journal
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• v.10 no.5
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• pp.87-93
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• 2010

The objective of this study is to verify the safety in case of fire and change of residential environment for different wall construction approaches in a stairways apartment house. In order to confirm that case_1, which is current case that most of wall is opened and the case 2, which upper part of wall is limitedly opened are compared and analyzed based on simulations of fire, escape and natural ventilation performance. The analysis reveals that possible escape time for case 1 was more than 600 seconds and for case 2 was 195 seconds. Since the escape times for both cases were over 128 seconds, it would be reasonable to assume that every resident would escape. The simulation results on natural ventilation performance shows the air change per hour of case 1 and case 2 were .19n/h and .16n/h and there was 1.2 times difference. However, the difference was too insignificant and it could be seen as that different approaches on wall construction would not significantly influence on natural ventilation performance.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2017.11a
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• pp.331-332
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• 2017

본 논문에서는 선박간의 충돌이나, 항구시설과의 충돌 등으로 선체에 파공이 발생하여 선박내부에 저장되어 있던 해수 및 오염물질이 해양으로 유출되는 해양 재난상황에서 원격제어 방식으로 파공봉쇄장치가 선체 외벽에 부착 이동을 통해 파공부에 접근하여 파공을 봉쇄할 수 있는 장치를 개발하고 성능을 실험적으로 연구 하였다. 이러한 장치는 인력투입이 불가능한 상황에 신속한 초동 조치를 취할 수 있으며 인력으로 불가능한 압력으로 유출되는 상황에서도 봉쇄가 가능한 장치로 개발하였다. 본 연구를 통해 파공부를 직접적으로 봉쇄하는 장치인 봉쇄 패드의 성능시험의 결과 직경 150mm 파공에서 유출압 0.1~0.75bar의 상황에서 안정적인 봉쇄성능을 실험적으로 검증하였다. 또한 봉쇄패드가 결합된 통합방재로봇인 외부 투입형 선박파공 봉쇄 장치를 원격제어하여 0.1 bar의 압력에서 봉쇄 성능 시험을 성공하였다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.4
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• pp.91-100
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• 2013

This research is to measure and analyze the thermal performance of the apartment structure and to evaluate and establish standards of thermal insulation defect in order to make the basic data necessary for determining the degree of the thermal performance degradation and for repairing and reinforcing the exterior wall of the existing apartment. Furthermore, it is to predict the part of occurrence of the thermal bridge and condensation at the apartment building structure. On the other one hand, it is also to analyze the degree of thermal insulation performance according to the standards of thermal insulation and elapsed time, through the analysis by the workability of concrete.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.149.2-149.2
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• 2013

친 환경적 소재인 ETFE (Ethylene Tetra Fluoro Ethylene)는 내화학성과 단열성을 가지며 탁월한 빛투과성, 자정효과 및 초경량 소재의 특성을 가진 열가소성 불소수지로서 서울시 신청사, Water Cube라고 많이 알려진 베이징 올림픽 수영 경기장 같은 대형 건축물의 외벽에 사용될 만큼 최근 세계 각국의 건축가들에게 각광을 받고 있다. 본 실험에서는 영구자석을 이용한 고밀도 플라즈마로 높은 점착성과, 균일한 박막 및 대면적 공정이 가능한 RF-magnetron sputtering방법으로 기판인 Slide glass위에 ETFE를 증착하여 접촉각의 변화와 구조적 및 광학적 특성에 대하여 측정하였다. 접촉각 측정결과 35w에서 $15^{\circ}$ 이하의 친수 특성을 나타내었고, 자외선 파장에서의 투과율 측정 결과 87% 이상의 높은 투과율을 나타내었다. AFM (Atomic Force Microscope) 측정결과 35 W에서 1.6 nm의 RMS (Root mean square)값이 측정 되었다. ETFE 특성은 비가 오면 자동으로 이물질이 씻겨 내려 주기적으로 청소를 해줘야하는 유리보다 유지관리비가 적게 될 것으로 사료되고, 높은 자외선 투과율을 보임으로 온실에서 균형 잡힌 식물 성장을 위한 화학약품의 소모를 줄여 줄 것으로 사료된다.

• Fire Science and Engineering
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• v.23 no.6
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• pp.91-97
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• 2009

The mass flow rates and performance of natural smoke ventilators in high-rise buildings with 40, 80, 120 stories were evaluated using CONTAMW tool. The results showed that only limited part of smoke ventilators can have positive exhaust flow in high-rise buildings due to stack effect and wind velocities. In the higher story buildings larger stack effect can overcome outside strong wind effect to give more ventilation performance. The air tightness of the building have strong effect on the exhaust performance of the ventilators to give lower performance with loose air tightness of the exterior walls.

• The Journal of Korea Robotics Society
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• v.14 no.3
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• pp.191-195
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• 2019

This paper presents a rope modeling and verification for the robotic platform of the wall cleaning robot (ROPE RIDE). ROPE RIDE has the characteristics of climbing up and down using a rope fixed on the roof like traditional workers. In order to perform a stable operation with a wall cleaning robot, it is necessary to estimate the position of the robot in a vertical direction. However, due to the high coefficient of extension and nonlinearity of the climbing rope, it is difficult to predict the behavior of the rope. Thus, in this paper, the mathematical modeling of the rope was carried out through the preliminary experiment. Extensive experiments using different types of rope were used to determine the parameters of the constitutive equation of climbing ropes. The validity of the determined parameters of various ropes was verified through the experiment results.

• Journal of the Korean Institute of Rural Architecture
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• v.22 no.4
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• pp.71-78
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• 2020

Today, the whole world is going through a big chaos due to the COVID-19, but paradoxically, the emergence of COVID-19 has been leading to the need for sustainable development, such as Green New Deal that can improve global warming and carbon emissions, and the need for sustainable architecture is growing bigger and bigger in the architectural field as well. The level of CLT buildings in Korea is at a very rudimentary stage, while CLT buildings remedying existing wooden buildings are getting the spotlight among European countries for sustainable architecture. This study was conducted to categorize structure layer compositions of overseas CLT buildings and analyze architectural techniques and materials applied by collecting and analyzing information about CLT structure layer compositions of overseas CLT building-related institutions, companies and cases. When classifying structure layer compositions of foreign CLT buildings depending on the roles of layers. it was revealed that exterior wall structure layers were combined and organized within a sequence of external finishing, ventilation, waterproof, board, external insulation, airtightness, structure, airtightness, interior insulation, interior finishing, sloped roof structure layers were external finishing, ventilation, waterproof, board, external insulation, airtightness, structure, airtightness, interior insulation, interior finishing, flat roof structure layers were external finishing, ventilation, waterproof, planking wood, external insulation, waterproof, external insulation, airtightness, structure, airtightness, interior insulation, interior finishing.

• Explosives and Blasting
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• v.40 no.2
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• pp.15-24
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• 2022

Recently, the demand of demolition for the unnecessary industrial structure is increasing due to deterioration tendency and the issue of demolition is becoming a major highlight. The restoration of the dismantled industrial site to its original natural state was currently underway. This execution case was intented to describe an application of the felling method one of the explosive demolition method to the demolition of the industrial stack. This stack was 150m high, a composite structure in which the outer wall of the stack was a reinforced concrete shell structure and internal stovepipe was a steel shell structure. As as result of the explosive demolition, the stack had collapsed precisely according to estimated direction. And the explosive demolition was completed without causing any damage to surrounding facilities.

• The Journal of Korea Robotics Society
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• v.17 no.3
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• pp.381-386
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• 2022

We develop a business model for facade cleaning service robot system that provides service by meeting the market needs and environments. The size of the facade cleaning market is growing rapidly in recent years due to the increasing importance of indoor space and the modern trend of building construction methods. Also, maintenance of exterior appearance of buildings has become an important factor in residential and commercial facilities. Though demand for facade cleaning services is rising, the current facade cleaning services are performed dangerously in a human labor-dependent way. It is desirable that the existing human resource service should be replaced with robot-based services. In addition, quantitative analysis of rental pricing model was conducted to propose effective launch of products to the market. The robot system is economically attractive from the consumer's point of view. When the actual facade cleaning robot service is released, it is expected that verification of the business models and more accurate analysis with specific figures can be performed.

• Geotechnical Engineering
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• v.13 no.6
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• pp.165-180
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• 1997

The structure such as underground external walls of buildings, conduit and box culvert supports the surcharge loads (point, strip and line loads) . The vertical and horizontal stresses in a soil mass depend on the backfill width and wall friction, etc. The investigations described in this paper is designed to identify the magnitude and the distributions of the lateral and vertical pressure which is occurred by the narrowly backfilled soil in an open cut by the surcharge loads. For these purposes, model tests were performed for various width of backfill in a model test box by considering the wall friction using carbon rods. The results of test were compared with the theories of Weissenbach and VS Army Code and also with the results of the numerical analysis using finite difference method which introduces Mohr-Coulomb failure hypothesis.