• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.36 no.8
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• pp.35-39
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• 2007

• Journal of the Korean Institute of Rural Architecture
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• v.15 no.1
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• pp.29-36
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• 2013

This study is to diagnose causes of damage and defects on external walls of brick structures, focused on "Naju Noahn" Catholic Church of Modern Architectural Properties. The causes of crack and deflection are overloading, shortage strength of arch. Among those, main cause is cauesd by shortage strength of arch because center of arch is dislocated and skew back of arch is small angle. The causes of damage and elimination are weathering, plants of friction, freezing and thawing, durability decrement of material and attach defection. This defects and damage is caused by high-moisture that occurs in soil. The causes of discoloration are change of soil moisture and flimsy brickwork. These defects and damage are mainly occurred in coping of cornice, weathering of window sill.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04b
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• pp.670-672
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• 2000

본 논문에서는 단일광자방출 전산화단층촬영영상 (SPECT)을 이용하여 좌심실의 내.외벽의 운동을 분리하여 추적하는 방법을 제시한다. 좌심실의 운동은 크게 평행이동, 회전이동, 비강체 변형으로 나뉘어 분석된다. 운동 추적을 위해 사용된 역동적 변형 솔리드는 물체중심 변동 좌표계로써 특징점들의 모드형태벡터를 사용하고, 좌심실 역동성을 유한요소방법에 의해 시뮬레이션한다. 또한, 변형 모델에 대해 묵시적으로 표준화된 parameterization을 하지 않고, 의료영상으로부터 얻은 자료값을 직접 이용하기 위해 노드간 보간함수로써 3차원 가우시안 함수를 사용한다. 그리하여 보다 자연스러운 방식으로 연속적으로 변화하는 좌심실의 운동을 추적할 수 있다. 이러한 분리된 내.외벽 운동 분석은 운동 기능에 이상이 있는 심질환 분석을 보다 효과적으로 도울 수 있다.

• Journal of the Korean Institute of Navigation
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• v.22 no.1
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• pp.55-62
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• 1998

In this paper, we have performed a numerical calculation of the scattered electromagnetic field around the building to evaluate electromagnetic interference caused by the building in the TV frequency band. The relations between the exposed concrete area of a building wall and the magnitude of the reflected wave have been examined in the case that the electroagnetic wave absorbers partially cover the building wall. From the obtained scattered electromagnetic field, we have calculated the DU radio and the required reflection loss of the electromagnetic wave absorbers which attached on the building wall to protect TV ghost.

• 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.

• Journal of the Korean Wood Science and Technology
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• v.39 no.3
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• pp.230-237
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• 2011

The study was performed to investigate the characteristics of charcoal and temperature change of a kiln's inner and outer walls in carbonization process using improved kiln. In this kiln system, carbonization process was completed in eight days. In the kiln, the ignition temperature was kept about $720^{\circ}C$. And then the temperature were increased gradually prior to be refined. Finally, the temperature in refining process was reached to maximum point, $1,000^{\circ}C$. In the chimney, the temperature was increased gradually from $90^{\circ}C$ at ignition to $750^{\circ}C$ at refining. The temperature change of the kiln wall resembles a temperature change progress curve during a carbonization process. The highest temperature of the kiln wall that appeared by a carbonization process was around $500^{\circ}C$. As a result of having measured an inner wall and the outer wall of the kiln using an infrared thermography camera, it was judged with there being considerable latent heat on kiln wall and ceiling. Fixed carbon contented of charcoal was 85.9~89.9%. Refining degree of charcoal, hardness, calorific value and pH were l, 12, 7,047~7,456 kcal/kg, 9.0~9.9, respectively. The yield of wood charcoal was 13.8%, and compared to conventional kiln's yield increased 1.5%.

• Fire Science and Engineering
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• v.27 no.3
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• pp.8-13
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• 2013

In case of fire in a high-rise building fire can be easily spread along the building external walls dramatically if the flame comes out through broken windows. There are a few effective methods to prevent the fire spread at the moment. One is using a fire resistance window, and the other is using a window sprinkler that discharges water to resist flame in case of fire. In this study a window sprinkler which is installed on top of windows and prevents fire by discharging water when its heat-responsive element opens was tested using a large scale furnace in accordance with the standard temperature-time graph. Test result showed that one window sprinkler was able to protect a 2,400 mm wide window from fire for 2 hours and the window backside's temperature locally increased up to $126^{\circ}C$ but kept stable around $100^{\circ}C$ for the test duration.

• Journal of Energy Engineering
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• v.28 no.4
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• pp.103-110
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• 2019

The domestic innovative power reactor named iPOWER will employ the passive molten corium cooling system(PMCCS) to cool down and stabilize the core melt in the severe accident. The final design concept of the PMCCS is yet to be determined, but the in-vessel retention through external reactor vessel cooling has been also considered as a viable strategy to cope with the severe accident. In this study, the two-phase natural circulation flow established between the reactor vessel and the insulation was simulated using a thermal-hydraulic system code, MARS-KS. The flow path of cooling water was modeled with one-dimensional nodes, and the boundary condition of the heat load from the molten core was defined to estimate the naturally-driven flow rate. The evolution of major thermal-hydraulic parameters were also evaluated, including the temperature and the level of cooling water, the void fraction around the lower head of the reactor vessel, and the heat transfer mode on its external surface.

• Journal of the Korea institute for structural maintenance and inspection
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• v.24 no.1
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• pp.43-50
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• 2020

In this study, the possibility of seismic performance design was proposed and the quality verification test method was reviewed as part of the design of waterproof performance in underground walls under accelerated environment conditions for waterproofing materials, which are barrier and finishing material that can prevent ingress or overflowing water from inside and outside of a building by attaching all of the construction materials used in construction structures. Considering the current state of earthquake-resistant design of construction materials in Korea and abroad, seismic product groups are rare and mostly dependent on construction methods because there are no regulations on materials, although there are still regulations on earthquake-resistant design in the building process under the current law. Overseas, it was possible to confirm that various building materials that gave seismic performance to non-structural materials, such as Japan, Canada, and Germany, are being developed. If it is possible to have a complementary response to earthquakes in the advanced external waterproofing materials, it can be expected to be applicable as leak prevention and prevention technology along with the seismic designed structure.

• Journal of the Korea Institute of Building Construction
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• v.13 no.5
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• pp.434-440
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• 2013

Generally, the envelope of a freeform building is composed of a structure made with rectangular or C-shaped steel pipe, and steel or aluminum panel finishes on the structure. However, these construction methods increase material loss and cost and time. There are also numerous cases of misunderstanding of design and difficulties in construction, which frequently cause construction errors. Such construction errors decrease construction productivity, resulting in poor construction quality and the need for rework, as well as cost and time overruns. To solve the problem, this study proposes a 3D coordinate control technology for freeform structure implemented through a CNC(Computerized Numerical Control) Twisted tube method, and by extension, develops a BIM-based envelope construction method for freeform building.