• Journal of the Computational Structural Engineering Institute of Korea
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• v.21 no.2
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• pp.161-168
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• 2008

In this paper, a tuned liquid mass damper(TLMD) was proposed and experimentally investigated on its control performance, which can control bi-axial responses of building structures by using only one device. The proposed TLMD controls the structural response in a specific one direction by using a liquid sloshing of TLCD. Also, the TLMD reduces the response of structures in the other orthogonal direction by behaving as a TMD that uses mass of the container itself and liquid within container of TLCD installed on linear motion guides. Force-vibration tests on a real-sized structure installed with the TLMD were performed to verify its independent behavior in two orthogonal directions. Test results showed that the responses of a structure were considerably reduced by using the proposed TLMD and its usefulness for structural control in two orthogonal directions.

• Journal of Korean Society of Forest Science
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• v.89 no.5
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• pp.585-590
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• 2000

The studies were carried out to know shade tolerance of the plants for the urban forest aromatic bath. The one to two year old potted seedlings were grown under the one of the five light conditions such as 100%, 50%, 30%, 10% and 2% of the full sun light intensities. Pinus densiflora S. et Z., P. sylvestriformis (Takenouchi) Chien., Thymus quinquecastatus Celak, Lonicera japonica Thunb, and Zingiber officinale Roscoe showed decreasing tendencies in height and root collar diameter growth, and dry mass production as the light intensity decreases. Exceptionally Thuja koraiensis Nakai showed the best growth in the 50% of full sun light intensity. Athyrium yokoscense (Fr. et Sab.) H. Christ showed better growth in the relative light intensity of 10 to 15% than in the in the relative light intensity of 25 to 30% in the bath green house.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.60.1-60.1
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• 2010

공동주택에서 태양광발전(PV)을 통한 세대 전기에너지 이용은 모듈 설치 면적의 제약으로 인해 전 세대를 대상으로 활용하기에 현실적으로 어려움이 있다. 특히 남향이나 남동, 남서향으로 위치한 거실 창호를 활용하는 경우에도 결정질 실리콘(crystalline silicon) 태양전지 셀로 인한 실내 음영문제 등으로 건물통합형 태양광발전(BIPV) 시스템의 가시성을 확보하는데 한계가 있다. 따라서 이런 문제점을 극복하고자 투광형 비정질실리콘(amorphous silicon) 태양전지를 이용한 발코니창호/커튼월 BIPV 시스템을 구축하고, 테스트베드를 통한 적용성 평가 검증을 수행하였다. 테스트베드는 KCC 중앙연구소 1층 외부 측창에 결정질 BIPV 모듈(A2PEAK 사(社), 최대 출력 210 Wp, W 2,000 mm ${\times}$ H 1,066 mm)과 10% 및 30% 투광형 비정질 BIPV 모듈(Sharp 사(社) See Through type, 최대 출력 135 Wp/123 Wp, W 1,930 mm ${\times}$ H 1,180 mm)을 각각 설치(남서 $30^{\circ}$, 수직 $90^{\circ}$)하여, 2009년 5월에서 8월 사이 4개월에 걸친 모니터링을 통해 실제 발전량 데이터를 확보, 시스템에 대한 분석을 진행하였다. 분석 결과, 설치용량당 일평균 발전량은 결정질형이 1.46 kWh/kWp, 10% 투광형은 1.10 kWh/kWp, 30% 투광형은 0.73 kWh/kWp을 나타내었다. 10% 투광형과 30% 투광형의 모듈 성능 차이는 크지 않으나 발전량에 있어서는 큰 차이를 보였고, 10% 투광형의 설치용량당 일평균 발전량은 경정질형의 75.2% 수준으로 투광형 비정질실리콘 BIPV 시스템의 창호 적용 가능성을 확인하였다. 특히 세대 거실 창호를 통한 가시성 확보는 기존 결정질 BIPV 창호의 단점을 개선하였다. 건자재 일체화로 구축된 가시성확보 BIPV시스템 창호는 단위 세대별 적용이 쉽고, 공동주택에서 PV 시스템의 설치면적을 극대화시키므로 향후 Zero Energy 공동주택 구축에도 활용성이 클 것으로 기대된다.

• Science of Emotion and Sensibility
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• v.14 no.2
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• pp.301-310
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• 2011

Today, the city greatly increase the interest in the night, increasing the importance of building and landscape lighting is a trend. Landscape lighting and a combination of factors, especially the media has been expanding in the domestic media facade. The facade of the building for the implementation of the screen to install the LED, or are projecting the image through the projector. The facade of this study present a paradigm shift in traditional media based on interactive and works by combining the artistry of the item type, art, colors, patterns, and interactions were drawn into 5 main topics. This section of the 83 kinds of domestic. Other media facade sample was classified. Categorized by 5 types of lighting techniques, lighting system, manner of expression, changing the way lighting design elements were based. Thus, the current trend changes, depending on the technical value and artistic value of the applied media facade lighting design should be applied to identify the elements and the combination of media facades and IT skills beyond simply directing programmed to communicate interactively with various designs Must be for you.

• Journal of Korean Society for Geospatial Information Science
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• v.15 no.3
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• pp.59-67
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• 2007

This paper proposes potentialities of constructing the information system for earthquake hazard management which can manage and analyse earthquake risk and hazard systematically. The experimental results as well as architectural structure investment data for seismicity assessment are built in database and connected with GIS for assessing earthquake safety of building in urban area. For earthquake-resistant performance assessment, we collected and classified building structural data according to assessment criteria using building register, architectural map, digital map, and then complemented database with field survey data. We also suggest GIS-based information system can cope with and manage earthquake hazard effectively, as evaluating earthquake risk by performing detailed earthquake-resistant assessment and determining final assessment scores. The assessment should be processed quickly and accurately by integrating the earthquake hazard information management system with modularization of assessment procedure and method in the future.

• Land and Housing Review
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• v.12 no.1
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• pp.129-137
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• 2021

External shading devices are well known solar control devices that can help reduce the cooling load of commercial buildings. For this study, experiments were conducted to examine the feasibility of shading devices in reducing both the cooling and heating loads. The influence of sky radiant cooling during winter was verified for the external shading device, internal roller blind, and window. Results can be summarized as follows. The temperature difference between the inner and outer surfaces of the window with the external shading device was 11.8℃ compared to 14.6℃ for one without the external shading device. This 2.8℃ difference was due to heat exchange by sky radiation when the surface temperature of the shading device was lower than the ambient outdoor air temperature. The roller blind resulted in a lower temperature of 0.8℃ compared to the average temperature of the window's air cavity. This was due to heat exchange by sky radiation of the roller blind surfaces. Without shading devices, the outside surface temperature of the window is about 3℃ higher. The study also found that when external shading devices were installed on both the southwest and southeast sides, the outside surface temperature of the windows were lower on the southwest side than the southeast side.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.28 no.5
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• pp.511-521
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• 2015

The thermal bridge occurring in a building influences its thermal performance and durability. The domestic typical multi-unit residential buildings suffer thermal losses resulting from thermal bridges of the balcony slab. To minimize the thermal loss between inside and outside of the balcony slab, thermal bridge breaker(TBB) systems have been developed and applied in building construction. Although thermal bridge breaker systems for reinforced concrete(RC) wall-slab joints can improve the thermal performance of a building, it is necessary to verify the structural performance of TBB systems whether they provide proper resistance for cyclic loading. In order to investigate the structural characteristics of TBB systems embedded in RC slabs, cyclic tests of wall-slab joints were performed by applying two reversed cycles at each up to 30 cycles. The test results show that the RC slabs embedding TBBS systems can present excellent structural performance and the maximum moment capacity, energy dissipation capacity and ductility of TBBs systems are enhanced compared to those of the typical RC slabs.

• KIEAE Journal
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• v.17 no.3
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• pp.99-106
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• 2017

Purpose: Most modern office buildings adopt the curtain wall system in order to provide occupants with the sense of openness and high-technology, which requires large window area. As a result, the amount of solar radiation increases, negatively affecting cooling load during the summer and increasing energy costs. However, the performance of window itself is not sufficiently controllable parameter to control thermal comfort and solar radiation. Therefore, a shading device such as venetian blind is required to control them and thus a variety of studies have been performed thus far. So, the purpose of this study is to improve the performance of blind through the development of blind control algorithm. Method: Among various input variables for the control of venetian blinds, the vertical solar radiation has been selected in this study as the primary input variable and the optimal control algorithm for venetian blinds were developed for each window orientation. Result: The developed optimal control algorithm has a positive effect on building energy savings.

• Journal of the Korea Concrete Institute
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• v.22 no.3
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• pp.381-388
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• 2010

In this study, characteristics of the seismic response of the non-earthquake resistant reinforced concrete (RC) frame were identified. The test building is designed to withstand only gravity loads and not in compliance with modern seismic codes. Smooth bars were utilized for the reinforcement. Members are provided with minimal amount of stirrups to withstand low levels of shear forces and the core concrete is virtually not confined. Columns are slender and more flexible than beams, and beam-column connections were built without stirrups. Through the modeling of an example RC frame, the feasibility of the fiber elementbased 3D nonlinear analysis method was investigated. Since the torsion is governed by the fundamental mode shape of the structure under dynamic loading, pushover analysis cannot predict torsional response accurately. Hence, dynamic response history analysis is a more appropriate analysis method to estimate the response of an asymmetric building. The latter method was shown to be accurate in representing global responses by the comparison of the analytical and experimental results. Analytical models without rigid links provided a good estimation of reduced stiffness and strength of the test structure due to bond-slip, by forming plastic hinges closer to the column ends. However, the absence of a proper model to represent the bond-slip poased the limitations on the current inelastic analysis schemes for the seismic analysis of buildings especially for those with round steel reinforcements. Thus, development of the appropriate bond-slip model is in need to achieve more accurate analysis.

• Korean Journal of Medicinal Crop Science
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• v.7 no.2
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• pp.83-88
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• 1999

To find out proper harvest time and to select a variety having high yield and good quality, growth characteristics and contents of rosmarinic acid and essential oil were investigated according to harvest time of Agastache rugosa O. Kuntze collected in Korea. Only the number of flower cluster per plant among growth characteristics of 7 collections showed not significant difference. The range of dry matter weight of above-ground part used as crude drug was $666{\sim} 1328kg/10a$ and the weight of flower cluster and root was not significant among the plant parts of collections. Dry matter weight of top was the highest on Sep. 20, full-bloom stage. Rosmarinic acid contents among in 7 collections showed significant difference and the range were $0.32{\sim}2.34%$ in flower, $0.97{\sim}1.64%$ in leaf, $0.03{\sim}0.21%$ in stem and $0.91{\sim}6.56%$ in root. The contents of rosmarinic acid and essential oil in leaf was 3.76%, 5.78% before flowering and 1.55%, 4.28% after flowering respectively. The total content of rosmarinic acid of all plant parts was decreased after flowering but that of essential oil was increased after flowering.