• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.163-164
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• 2019

Curtain wall is constructed in various forms and designs by forming the exterior walls of a building, and refers to non-bearing walls that divide the exterior and interior spaces of a building. Curtain walls require not only wind pressure, but also waterproof, insulation, insulation, and durability, as well as the effects of recent frequent earthquakes. Studies on the sleeve used to connect the vertical member mullions in the process of high-rise curtain walls are insufficient. In this study, sleeves connecting curtain wall mullions were developed to absorb external displacement, and the purpose of this study was to evaluate economic feasibility through comparison with existing construction methods.

• 대한안전경영과학회지
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• 제11권2호
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• pp.77-85
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• 2009

Considering heat insulation and beautiful sight of construction, making use of exterior panels is increasing. Recently the exterior panels now are weak very much, and so in consequence of the weakness fire spreads rapidly. Compared with internal fire, external vertical fire spread rate goes rapidly and it is extensive in spread range, therefore it is dangerous very much. Accordingly, under present condition of poor standard of exterior panels, it is required to take measure to meet the appropriate situation. In this study, by making use of FDS(Fire Dynamic Simulation) program about external vertical fire of high rise building, fire behavior is searched by computer. It is important that realizing by computer fire modeling about external vertical fire must be included certainly in procedure of fire performance design in the future. In modeling program, FDS version 5 is available, and aluminium composite panel is applied in external panels. In this study, for realizing of actual fire condition, FDS is applied by details of fire scenarios considering influence of wind.

• 한국표면공학회지
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• 제48권2호
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• pp.33-37
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• 2015

High efficiency LED device is being concerned due to its high heat loss, and such heat loss will cause a shorter lifespan and lower efficiency. Since there is a demand for the materials that can release heat quickly into the external air, the organic insulating layer was required to be replaced with high thermal conductive materials such as metal or ceramics. Through anodizing the upper layer of Al, the Breakdown Voltage of 3kV was obtained by using an uniform thickness of $60{\mu}M$ aluminum oxide($Al_2O_3$) and was carried out to determine the optimum process conditions when thermal cracking does not occur. Two Ni layers were formed above the layer of $Al_2O_3$ by sputtering deposition and electroplating process, and saccharin was added for the purpose of minimizing the remain stress in electroplating process. The results presented that the 3-layer film including the Ni layer has an adhesive force of 10N and the thermal conductivity for heat dissipation is achieved by 150W/mK level, and leads to improvement about 7 times or above in thermal conductivity, as opposed to the organic insulation layer.

• 한국전산구조공학회논문집
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• 제24권4호
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• pp.429-438
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• 2011

본 논문에서는 Membrane형 LNG선의 구성 요소를 대상으로 단열창의 열적 분포를 알아보기 위해 극저온 상태에서부터 온도 별로 각 소재의 열적 물성치인 열전도도(thermal conductivity)를 실험을 통해서 알아보았다. 극저온 상태인 $-163^{\circ}C$의 온도상태로 유지되어야 하는 LNG선 화물탱크는 단열재료로 하여금 열을 차단하기 위해 많은 연구가 되어야 하는데 특히 여러 재료로 구성되어 있는 단열 화물창(CCS: Cargo containment system)은 열적 물성치가 온도에 따라 각각 어떠한 값을 가지는 것이 주요 관심대상이고, 이를 통해 전체 LNG 단열 화물창이 어떤 열적 분포를 가지는 것에 대한 연구가 필요하다. 실험을 통해 얻은 물성치를 가지고 전체 화물창의 온도분포를 정적 열해석을 통해 알아보았다. 또한 외부의 충격에 의해 LNG가 누수되었을때 2차 방벽 특히 hull 부분에서는 누수량에 대해서 어떠한 온도분포와 열적 안전성에 대해서 알아보았다.

• KIEAE Journal
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• 제12권3호
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• pp.41-46
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• 2012

The building envelope is important specially for saving energy consumption of residential buildings. but Apartment houses in Korea commonly have inside insulation system which have constantly arisen thermal bridges, the risk of heat loss, as a necessity. This study aims to evaluate integrated insulation performance according to the different shapes of external walls, adjacent to windows. The thermal performance analysis was carried out by Equivalent U-value and using the three-dimensional heat transfer computer simulation (TRISCO-RADCON), under nine different cases of comparing among three each of different bases(current standard model, 30percent energy saving model and 60percent energy saving model). The heating and the cooling load were also compared between two cases (standard U-value and Equivalent U-value) of three each of different bases, using the Building energy simulation which is based on DOE-2.1 analysis. As results, it turns out that if the Equivalent U-value is considered on the envelope analysis, the heat flow loss will be increasing more than the standard U-value, and if heat insulation property of the residential building reinforced rather than current, the rate of influences on the thermal bridges would be extremely expanded. In addition, it is shown that annual heating loads of the apartment house with applied Equivalent U-value substantially increased by more than 15 percent compared to those with the existing U-value, but annual cooling loads were negligibly affected.

• 한국안전학회지
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• 제9권1호
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• pp.56-60
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• 1994

In this study, Cuttent vs. Temperature characteristics of polyethylene with high-voltage treatment and crystallinity have been studied. The current curve( $I_{th}$) shows two peaks at 85 ($^{\circ}C$) and 50($^{\circ}C$), respectively. Trapping of carriers Proceeds during the high-field treatment, and it Is clear that 1th arises from the drift of carriers under the external voltage( $V_{b}$). From the results of TSC of BDPE and LDPE. It is realized that the traps are relation to the crystallinity.y.y.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.323-337
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• 2009

This paper researched the adiabatic characteristic, safety and sound insulation characteristic of rolling stock window pane type and transition process of korean train vehicle window glass, and also including investigating a hereafter course of development. The window pane have provided the romantic feeling and the external scenery of train travel to the passenger in period of korea 110 year railway history. From the adiabatic viewpoint, this paper reviewed heat conductivity(U-value) and solar factor according to window pane type, including the safety and sound transmission loss of window pane.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1385_1386
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• 2009

In this paper, we examined the faulted cable joint through the external form analysis, material analysis, experimental verification and it's cause diagnosis system. It was not observed the voild, sharp material from the external form analysis and material variation. From the experimental verification, the thickness decrease of an insulator decreased ac breakdown strength suddenly and the breakdown traces of the insulator that was damaged by knife displayed elliptic shape. Thus, the faulted cable is assumed to accident that become dielectric breakdown by the deterioration of insulation performance that can happen when work.

• 전기의세계
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• 제29권11호
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• pp.727-732
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• 1980

The main purpose of this paper is to study on the effect of contact state between metal-polymer interface in electrical conduction of polymeric materials under low field region. The electric conduction of polythylene (PE) sandwitched in between two gold (Au) electrodes was lower than that of PE Sandwitched in between two Aluminium (Al) electrodes under low external field. The discharge current of PE which have been treated by the high field application is also obtained some results under no external field. The obtained results can suggest that the material of electrode come to influence on the electrical conduction of polymeric materials and are important as a basis for analysing the data on TSC. It is also suggestive that results of observation must be considered in cases of insulation design of electrical machinery.

• 한국전기전자재료학회논문지
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• 제14권7호
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• pp.578-583
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• 2001

The bushing for high voltage and large and power should endure weight of itself and force of pushing from contact with circuit breaker. Like this, epoxy mold bushing has to be strong without fault. However, the external circumstances and internal factors was caused by partial discharge, flashover and dielectric breakdown. Therefore, to remove external factor of defect and to prevent the internal cracks and cavity generated from the contraction on interface of Cu-Epoxy, we should form semi-conductive layer on Cu bar by carbon. Then, the PD properties and the insulation qualities of epoxy mold type bushing was able to improved by roles of cushions for the direction of diameter and by effects fo natural sliding like as separated from conductor for the direction of length. So, in this work, we could prove the method of semi-conductive layer in making the long conductor.