• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2010.04a
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• pp.227-227
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• 2010

기존 도공지 생산 공정에서 널리 사용되던 블레이드 도공방식을 대체할 수 있을 것으로 기대되는 커튼코팅 방식은 스크래치, 스트릭, 미스팅, 블레이드의 마모등을 발생시키지 않고 고고형분 도공이 가능하며 우수한 커버리지를 갖는 도공층을 형성시킬 수 있다는 장점을 갖고 있다. 뿐만 아니라 하나의 코팅 유닛에서 여러개의 도공층을 한번에 형성시킬 수 있어 설비투자비용 및 건조에너지, 공간활용도 절감 측면에서도 한층 유리하다. 커튼 코팅 방식에서 도공액의 유동은 도공액이 필름 형태로 사출되는 sheet forming zone, 도공액 커튼이 낙하하는 curtain flow zone, 도공액 커튼이 원지와 접촉하는 impingement zone으로 나뉜다. 커튼 코팅이 이루어지기 위해서는 sheet forming zone과 curtain flow zone에서 도공액이 얇은 막 상태를 안정적으로 유지하고 impingement zone에서는 고속으로 이송되는 도공원지에 의한 급격한 신장 조건에서 도공액 필름이 끊어지지 않고 유지되어야 한다. 이를 위해 유화제를 통해 동적 표면 장력을 낮초고 rheology modifier를 통해 점도 및 신장점도를 조절해 도공액의 커튼 안정성을 부여하는 연구가 보고된 바 있다. 도공액 제조시 바인더로 널리 사용되는 S/B 라텍스는 입도, 유리전이온도, 표면전하 등 그 특성을 달리하여 제조할 수 있으며 이러한 특성에 따라 도공액의 점도와 같은 유변특성이 변화하여 도공액의 커튼 안정성에 영향할 것으로 예상된다. 따라서 본 연구에서는 입자경과 유리전이온도, 카르복실화 정도 등을 달리한 다양한 S/B 라텍스를 사용하여 유변특성을 달리한 도공액을 제조하고 커튼 안정성의 변화를 살펴보고자 하였다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.04a
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• pp.351-356
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• 2011

본 연구에서는 국외 커튼월 내화 Code인 EN 13830, EN 13501-1, EN 1364-3을 사용하여 알루미늄과 스틸프레임에 대해 화재시 최적설계조건 도출을 위한 실험을 실시하였다. 현재 국내 커튼월의 내화 법규는 2008년 '내화 충전구조 세부 운영지침'에서 조인트 부분에 대해서만 내화규정이 정립되어 있다. 따라서 본 연구에서는 EN 13830과 그 하위법을 이용하여 알루미늄과 스틸 커튼월의 최적설계조건 도출을 위한 실험을 실시하였다. 실험 결과 차염성은 알루미늄 커튼월과 스틸 커튼월의 성능시간이 각각 10분 26분으로 약 16분의 차이가 발생하였고, 차열성은 알루미늄 커튼월과 스틸 커튼월이 최고온도에서 6분과 9분으로 약 3분정도의 차이를 보였고 평균온도에서는 9분, 24분으로 약 15분의 차이를 보였다. 그리고 복사열은 성능기준 $15Kw/m^2$를 통과하는데 알루미늄 커튼월은 16분 스틸 커튼월은 24분을 기록하였다.

• Korean Journal of Construction Engineering and Management
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• v.10 no.3
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• pp.92-101
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• 2009

The purpose of this study was to develop the curtain-wall structure design evaluation manual that can easily examine the curtain-wall structural members (Mullion and Transom) stability from the position of the construction managers. Through analyzing the structural design reports in the previous studies and interview with industry experts, the curtain-wall structural member design process was elicited. The manual, which consists of Microsoft Excel-based work sheet and its manual, was applied to a real curtain-wall design project to make sure its usability. A workshop with three curtain-wall experts and three construction managers was conducted to identify pros and cons of the manual, thereby enhancing its applicability in the future.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2013.11a
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• pp.59-60
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• 2013

본 연구는 고층 건축물의 외장재로 많이 사용되고 있는 커튼월에서의 화재확산을 방지하기 위한 방안으로 건축물의 기존 외장재와 설비들을 이용한 성능설계 적용 기법을 활용하기 위한 기초 연구로써 실험적 연구를 수행하였다. 이를 위해서가로 1.2 m, 세로(높이) 2.6 m 두 개의 유리가 붙어 있는 커튼월을 사용하였으며 한쪽의 유리에만 스프링클러를 설치하고, 커튼월 앞에 1m 지름의 헵탄의 화원을 사용하여 실험을 수행하였다. 스프링클러 설치 유무에 따라 커튼월의 유리의 파손으로 인한 화재 전파 방지에 효과가 있는 것을 확인하였다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.163-167
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• 2010

최근 건축물의 초고층화에 따른 커튼월 시공에 따라 유리의 비중이 증가하고 있다. 커튼월 구조는 바람, 지진 등에 취약하며, 화재 안전성에 있어서도 취약할 것이라 판단되므로, 국내외 건축용 유리 및 커튼월의 안전기준에 대한 조사를 실시하였다. 그 결과 국내의 유리 기준은 단열 및 내풍압 성능에만 집중되어있으며, 화재 및 지진, 안전성능에 대한 기준이 미비하며, 커튼월에 대한 안전대책은 전무한 실정이다. 따라서 외국의 사례와 같이 초고층에서 커튼월의 안전성능을 고려한 설계프로세스나 안전 기준의 세부화가 필요하다고 판단된다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2004.11a
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• pp.612-615
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• 2004

Today, the curtain wall is used in many construction projects because of excellent economical efficiency and constructability. The life-cycle process of curtain wall construction consists of the architectural design, curtain wall design, manufacturing, const겨ction, and maintenance phase which has become one of the most important objects that have to be managed. Since the general management method focused on each separated phase, it has accompanied many problems such as increases of the cost and duration, and loss of productivity. To solve these problems, it is necessa교 to have a new management method based on supply chain management. Thus this research analysed the processes of stick system, semi-unit system, unit system, and panel system classified by the type of the curtain wall, and suggested proper methods of application of SCM concept to each type of curtain wall construction.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2004.11a
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• pp.174-181
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• 2004

We will introduce a method of construction of super-block curtain wall applied to Tower Palace III which is the highest high-rise complex building in Korea. Up-up method is utilized on Tower Palace III to shorten the term of works and it is that the curtain walls for the belt wall part are installed after the rests. The belt wall structure increases the horizontal structural stiffness of the building. The method of construction of super-block curtain wall is developed and used to raise and install the curtain wails of the belt wall floor. It is that the large block of curtain walls corresponding to three stories is fabricated on the ground in advance and the block is installed at a time by a tower crane. Specialized installing equipment :,s newly developed and applied to install the super-block. curtain wail. The curtain wall of the upper floor of the belt wall part is installed after the super-block. The installing equipment for this floor is developed utilizing a mini excavator and vacuum suctions. The application of this method had made it possible to omit the setting up the scaffold and financial profits such as the shortening of the terms of works was realized. The safety of works was secured and the productivity was also improved.

• Korean Journal of Construction Engineering and Management
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• v.24 no.4
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• pp.14-24
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• 2023

The purpose of this study is to develop a prototype curtain wall with improved seismic performance and to verify the seismic performance by conducting an inter-floor displacement test. To this end, a prototype of the curtain wall was manufactured and a displacement similar to the earthquake load was induced, and then the damaged state of the curtain wall was checked. As a result of the first test, the frame and glass of the curtain wall were not damaged, but the Weather Sealant was partially damaged. As a result of the second test, there was no problem of glass breakage in seismic class (special), seismic class (I), seismic class (II), and AAMA 501.6. Through this experiment, the seismic performance of the curtain wall prototype was verified.

• Horticultural Science & Technology
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• v.32 no.4
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• pp.427-433
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• 2014

Trellising is an important cultural practice that affects grape quality and yield. Some grape cultivars require different trellising under different climate and soil conditions. To find suitable trellis conditions for grape cultivar 'Cheongsoo', we measured growth and fruit characteristics with three different trellis systems: curtain, Geneva double curtain (GDC), and modified T. The maximum light exposure of clusters in the curtain, GDC, modified T trellis systems was 670, 1,654, and $1,649{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, respectively. However, there was no difference in air temperature among the three trellis systems. Net $CO_2$ assimilation rate at $1,500{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ light intensity was 13.4, 13.7, and $8.7{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ in curtain, GDC, and modified T trellis systems, respectively. Trunk cross section area (TCSA) and bud burst rate were not significantly different among the three systems. Shoot number was 31.3, 47.0, and 37.0 in curtain, GDC, and modified T trellis systems, respectively. The shoot length was higher (243.9 cm) in the modified T trellis system than in the single curtain (171.1 cm) and GDC (151.5 cm) systems. Interior leaf number and leaf layer number were higher in the GDC system, in which there are two primary branches, in comparison to the modified T and curtain systems, which utilize one primary branch. Primary leaf area and lateral leaf area were significantly higher in the modified T trellis system in comparison to the GDC system. Berry weight, length and diameter, and total soluble solids were not significantly different among the three trellis systems. However, cluster weight and cluster number per tree were significantly higher in GDC. Titratable acidity was significantly lower in GDC. Collectively, our data suggest that the GDC trellis system is preferable for grape 'Cheongsoo' to maintain fruit quality and quantity in Korea.

• Fire Science and Engineering
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• v.25 no.6
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• pp.104-111
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• 2011

Aluminum has been widely used as frame materials in the curtain walls. Recently, use of steel as a curtain wall frame is being considered due to its higher strength and thermal resistance than aluminum. In this study, fire tests on the basis of EN 13830 were performed with aluminum and steel-aluminum hybrid curtain walls. From the tests, fire resistance integrity, thermal insulation, and radiation properties were evaluated for both systems and compared. According to the test results, the steel-aluminum hybrid curtain wall showed better fire-performance than the typical aluminum curtain wall for the fire resistance integrity and radiation properties. Although, the fire resistance performance for the insulation property was 6 min for both the two frames, the collapses were occurred at 36 min for the steel-aluminum hybrid curtain wall and at 13 min for the aluminum hybrid curtain wall.