• 에너지공학
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• 제8권2호
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• pp.285-292
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• 1999

한국표준원전의 원자로용기 단열재 설치시 설계인자에 대한 수치해석적 연구를 전산 유체유동 코드인 FLUENT를 이용하여 해석하였다. 단열재 두께 및 원자로용기 벽과 단열재의 내부표면간의 공간간격에 대한 인자에 대해서 연구를 수행했다. 또한 단열재 설치시 단열재판넬 사이의 틈새 간격 때문에 발생하는 chimney effect으로 인한 단열재의 성능저하를 평가하였다. 수치해석 결과 최적의 공간 간격 및 단열재 두께를 얻을 수 있었다.

• 대한건축학회논문집:구조계
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• 제35권6호
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• pp.121-128
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• 2019

There is a big move to build zero-energy buildings in the form of passive houses that reduce energy waste worldwide. Korea has set a goal of reducing its greenhouse gas emissions by 37% by 2030 through the activation of green buildings, such as strengthening the energy levels of new buildings and improving the energy efficiency of existing buildings. The use of insulation with high insulation performance is one of the key technologies to realize this, and vacuum insulation is the next generation insulation that blocks the energy flow of the building. In this study, we measured the bonding structure of dry and wet processing glass fiber core materials and compared the insulation performance of vacuum insulation panel. In addition, the insulation performance of vacuum insulation panel was measured according to the thickness of the laminated core. It can be confirmed that the lamination structure of the core and the lamination thickness are important factors for the heat insulating performance of the vacuum insulating panel.

• 복식
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• 제58권6호
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• pp.24-34
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• 2008

The purpose of this study was to create a database of information on fabric factors(i.e., fabric insulation, fabric weight, clothing weight, fabric thickness, air permeability, and water vapor resistance) of clothing used for insulations, to compare them according to clothing types, and to estimate thermal resistance of clothing using these factors. A total of 25 kinds of clothing were selected(9 types for suits, 6 types of jacket, 5 types for shirts, and 5 types for trousers). The results of this study were as follows; Thermal insulation of clothing showed the highest positive correlation(0.85, p>0.01) with thermal insulation of fabric and very high positive correlation with water vapor resistance, fabric thickness, fabric weight, and clothing weight, respectively, 0.77, 0.77, 0.73, 0.71(p>0.01). Fabric weight of jacket was higher than that of shirts and trousers. Air permeability of shirts was the highest of clothing types. Clothing insulation of jacket was higher than that of shirts and trousers and its fabric insulation was also the highest of clothing types. Regression analysis showed that fabric thickness, water vapor resistance, and fabric weight would be useful factors for estimating the thermal resistance of clothing.

• 한국전기전자재료학회논문지
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• 제21권11호
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• pp.1024-1028
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• 2008

It is important that study on cryogenic electrical insulation design to develop the cold dielectric(CD) type HTS cable because the cable is operated under the high voltage environment in cryogenic temperature. This paper proposes two types of insulation design to carry out the maximum insulation design for 154 kV-class HT cable. The proposed insulation design method takes into consideration AC and lightning impulse withstand voltage so as to prevent AC breakdown for power frequency operating voltage during operating the cable and breakdown for lightning impulse voltage. The final insulation thickness is determined by selecting high value out of two insulation thickness calculated through the two insulation design methods. And we researched electrical insulation characteristics of HTS cable according to bending ratio and the number of bending.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2271-2273
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• 1999

The manufacturing technology of XLPE power cable ( e.g. gas curing, triple common extrusion, clean room, super-clean compound, etc.) had been developed in 1960's and the design parameter of insulation thickness for EHV XLPE power cable at present was determined in 1960's. But, the quality of XLPE power cable has been improved up to now. The re-evaluation of design parameter for insulation thickness reductions is required and so we performed weibull plotting test using model cable. This paper describes the evaluation details of the insulation characteristics according to weibull plotting test.

• 한국초전도ㆍ저온공학회논문지
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• 제11권1호
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• pp.35-38
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• 2009

The high temperature superconducting(HTS) power cable, as a key component of the next generation power transmission system, operates cost-effectively because of much less transmission loss. Currently, a world-wide research has been undertaken actively. In this research, we designed insulation thickness and investigated thickness effect of laminated polypropylene paper(LPP) which is insulation material of HTS cable in case of AC and impulse breakdown.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 Techno-Fair 및 추계학술대회 논문집 전기물성,응용부문
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• pp.194-195
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• 2007

$SF_6$ gas used widely as insulating component in electric power industry has excellent in insulation and arc extinguishing performance in gas-insulated switchgear. However, the concern about eco-friendly alternative gas is currently rising because $SF_6$ gas is one of the main greenhouse gases. In this paper, dry-air and composite-insulation (dry-air+epoxy) as the alternative technology for $SF_6$ gas insulation is studied. Under the gas pressure ranged from 0.1 to 0.6MPa, the breakdown voltage of dry-air were measured in AC electric field. The data of composite-insulation were acquired by changing the thickness of epoxy used in each composite-insulation under the same condition.

• 한국태양에너지학회 논문집
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• 제22권3호
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• pp.39-46
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• 2002

The results of experiment on the performance of natural ventilation by insulation thickness and height system of solar chimney are described. The 3-inside wall was made of concrete and 1-wall was made of glass. The two kinds of model experiment were performed. One was the varition of the 60cm, 90cm and 120cm of solar chimney, the other was the variation of the insulation thickness 10mm and 50mm and without insulation of outside wall of solar cimney. As the temperature difference between bottom and top expressed $1.7\sim2.9^{\circ}C$, air velocity measured $0.5\sim0.8m/s$ and ventilation rate was $194.4m^3/h$ in the case of the 120cm height of solar chimney, the respect of natural ventilation performance was superior to others cases in the first model experiment. Though the case of 120cm height of solar chimney was attached 50mm insulation the ventilation rate was not so much as the case of solar chimney was attached 10mm insulation. the temperature difference between bottom and top was the largest in the other cases. From this research, the natural ventilation performance of solar chimney was affected by not only height and insulation thickness of solar chimney but also wind velocity and directon.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.51-55
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• 2007

In this paper Statistical Energy Analysis has been considered to predict high frequency air borne interior noise. Dash panel Insulation is major part to reduce engine excitation noise. Transmission loss and absorption coefficient are considered to predict dash insulation performance. Transmission lose is derived from coupling loss factor and absorption coefficient is derived from internal damping loss factor. Material Biot properties were used to calculate each loss factors. Insulation geometry thickness distribution was hard to measure, so FeGate software was used to calculate thickness map from CAD drawing. Each predicted transmission losses between conventional insulation and light weight insulation were compared with SEA. Transmission loss measurement was performed to validate each prediction result, and it showed good correlation between prediction and measurement. Finally interior noise prediction was performed and result showed light weight insulation system can reduce 40% weight to keep similar performance with conventional insulation system, even though light weigh insulation system has lower sound transmission loss and higher absorption coefficient than conventional system.

• KIEAE Journal
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• 제9권6호
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• pp.13-18
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• 2009

Korean traditional houses have been developed in harmony with natural environment and comfortable indoor condition by using the natural resources including building layout, space composition and materials. Originally Korea traditional architectures have used wood lintel constructions and loess walls through the many years. Theses loess have many strength such as highly heat capacity, controling of humidity, a deodorant than any other materials. Nowaday it is recommended to use exterior and interior walls in loess wall to meet the eco-friendly materials to improve our residental environmental. Thus this study aims to research the sound insulation performance of traditional loess brick wall varied with thickness, thermal insulation materials and cavity wall. The sound insulation performance of these loess walls are compared with other masonry wall's and sound insulation performance of th walls were tested in anechoic laboratory to measure the sound transmission loss of these walls. The loess brick wall with 75mm thickness of cavity is shown the sound insulation performance with Rw 57 which is nearly same performances of 1B brick wall and cement 8' block wall, The improving effect of insulation materials is shown in the high frequency bandwidth. Especially, there is improving as much as 11 dB using the extruded poly stylene form(75mm) and poly ethylene film(0.7mm).