• 설비공학논문집
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• 제28권9호
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• pp.343-349
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• 2016

Due to the recent increase in lighting energy consumption in buildings, there are a growing number of studies seeking solutions this problem. The effectiveness of light-shelves as natural lighting systems to solve this problem has been recognized, and various studies regarding such systems are being carried out currently. However, the lighting efficiency of light-shelves decreases if illumination intensity is low-such as at night time, and it also obstructs the views of building occupants. Therefore, the purpose of this study is to examine a movable drawer type light-shelf which allows for the width of the reflector to be adjusted and verify its performance through a simulated test-bed. The following conclusions were reached. 1) The purpose of this study is to solve the problem previously associated with the light-shelf system- of obstructed views-by responding to external environments and minimizing the width of the light-shelf at night time when the efficiency of the light-shelf declines. 2) The proper variables of the movable drawer type light-shelf which enables the width adjustment of the reflector were ascertained in this study according to four solar terms : a width of 0.6 m at an angle of $20^{\circ}$, a width of 0.4m with an angle of $20^{\circ}$, and a width of 0.1 m with an angle of $20^{\circ}$ were determined for the summer solstice, fall/spring equinoxes, and winter solstice respectively; revealing that width adjustment of the light-shelf is a significant factor. 3) The movable drawer type light-shelf which enables${\backslash}$width adjustment of the reflector suggested in this study can reduce the lighting energy consumption by 18.7% and 14.3% in comparison to previous light-shelves with a fixed width of 0.3 m and 0.6m, indicating that it is effective for saving energy.

• 산업기술연구
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• 제25권B호
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• pp.81-87
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• 2005

This project addresses the product identification and design application of corrugated products for kinetic architectural applications. Initially, an architectural approach to product identification was carried out with the end goal of demonstrating application design principles of numerous novel architectural examples from the forest products industry. A design and prototyping stage followed demonstrating such application design principles and functional analysis on various novel architectural examples. The results of coupling product identification with proven application advantages will be of potential value not only to architecture but also to other designers in the arts and sciences. The general motivation for the research arises out of a growing interest corrugated and paper products to be ideally suited for various architectural applications for their unparallel environmental benefits. Applications in architecture that use fewer resources and that adapt efficiently to complex and changing conditions are particularly relevant for an industry (architecture) that is increasingly aware of its environmental responsibilities. Corrugated and paper products are highly under-utilized by the building industry as design choice material for both interior and exterior applications. An increased awareness of the benefits of corrugated and paper products coupled with a process of designing for the total use and reuse will prove to be a valuable means by which issues of energy efficiency and environmental quality of buildings could be enhanced to be more efficient, affordable, and therefore reach a broader audience of users.

• 한국응용과학기술학회지
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• 제30권3호
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• pp.494-503
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• 2013

In this study, $CO_2$ adsorbent was produced for minimizing energy loss due to ventilation within the building. For improved selectivity about low concentration of $CO_2$ in multiple-use facilities, the ball type adsorbent was modified from a commercial zeolite, alumina, alkali metals and activated carbon with mixing LiOH, binder, and $H_2O$. We measured specific surface area, pore characteristic, and crystal structure of the modified adsorbent. Effects of alkalization on the absorptive properties of the adsorbents were investigated. Continuous column tests (2,000 ppm) and batch chamber tests ($4m^3$, 5,000ppm) showed that the modified adsorbent indicated about the selectivity of $CO_2$ more than 9.7% (0.613 mmol/g) compared with ordinary adsorbents and $CO_2$ removal efficiency of 88.8% within l hour, respectively. It was estimated that the modified adsorbent was applicable to indoor environments.

• 한국산학기술학회논문지
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• 제1권2호
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• pp.9-14
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• 2000

건물의 에너지 효율과 절약을 위해 최근 주목을 많이 받고 있는 가변 풍량 유닛(VAV)에 대해 실제적인 적용을 위한 적분기를 가진 상태 궤환 제어기를 연구한다. 디지털 제어기에 적합하도록 제어기를 개발하게 되며, 디지털 제어기는 결과적으로 대상으로 하는 실내 공간의 온도와 급기 유량으로부터 VAV 유닛 댐퍼의 개도를 조절한다. 설정 온도의 변화와 외부 온도의 변화등의 조건에 대해 모의 실험이 수행되었으며, 단순화된 대상 실내 공간과 댐퍼 구동기의 모델링이 고려되어 제어기의 이득 파라미터와 시스템의 동특성과의 관계를 고찰한다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.326-328
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• 2015

건물에서 창문의 기능은 태양 복사열의 유입을 통해 실내의 환경을 조성하고 동절기에는 난방비의 절감을 유도할 수 있으나, 다른 구조체에 비해 단열 성능이 크게 떨어져 5배 이상의 에너지가 손실되어 에너지 취약 부위이다. 또한 하절기에는 태양 복사열 과다로 냉방비가 가중된다. 이에 본 논문에서는 일반 가정에서 온도, 습도, 조도, 일사량 등의 실내 환경 정보를 이용하여 창문 자동 제어시스템을 개발하고자 한다. 이 시스템은 다양한 센서를 이용하여 실내 환경 정보를 수집하고 수집된 정보를 이용하여 모터를 제어하여 창문을 제어 할 수 있는 시스템이다. 가정 내 에너지 절감을 위하여 창호와 블라인드에 환경 자동화 서비스를 제공하여 사용자의 만족도를 높이고 스마트폰을 이용하여 시스템 제어를 통해 생활 속에 편리함을 제공하고자 한다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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• pp.171-176
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• 2012

This research on building Integrated Photovoltaic System replacing windows and doors with amorphous silicon thin film PV windows and doors installing same exact mount on Mock-up. The windows and doors should be installed in different angle and bearing so that we can analyse the amount of electricity from them. The objective of the research is to evaluate and investigate the relationship between factors(intensity of solar radiation, PV window surface temporature, incidence angle, and sky conditions) that affects performance of PV window and performance. The range and method of this research is to establish mornitoring system and analysis the date from the mornitoring system to evaluate the performance of PV windows that has thin film of solar battery. We should evaluate the insolation according to the position of PV window, output, and surface temperature according to months and seasons so that we can figure out the relationship between these. And we should investigate the relationship between performance and efficiency according to incidence angle and sky condition so that we can figure out the correlation between factors and performance.

• 한국컴퓨터정보학회논문지
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• 제16권2호
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• pp.217-224
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• 2011

기존의 유선상의 물리적 보안 시스템은 시간적, 공간적 제약을 갖는다. 이러한 문제점을 해결하기 위해서 본 연구는 스마트폰을 이용한 원격 물리적 보안 시스템을 구현 하였으며, 연구는 모바일 클라우드 컴퓨팅 기술을 기반으로 구현되었다. 모바일 클라우드 컴퓨팅 기술에서 요구되는 사용자 인증, 통신의 비밀성, 정보의 무결성, 시스템의 가용성, 접근제어 및 권한관리 그리고 안전한 핸드오프 등의 보안 기술을 구현하였다. 구현된 시스템은 계측, 감시, 제어를 통한 에너지 비용 절감 (5~30%)의 효율성을 갖는다. 본 시스템의 평균 접속 및 응답 시간 측정결과 값도 약 7.082초 이내로서 성능 대비 효율성이 높은 것으로 평가된다.

• 조명전기설비학회논문지
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• 제16권4호
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• pp.92-100
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• 2002

지구환경 보호 문제 및 에너지의 효율적인 활용이라는 측면에서 다른 발전시스템 보다 월등하게 효율이 높은 열병합발전시스템은 개발 및 실용화되고 있는 실정이다. 본 논문에서는 이와 같은 열병합발전시스템을 국내 H 백화점에 도입하는 경우 기존의 열 및 전기공급 방법의 요금과 신규로 열병합을 도입하였을 경우의 열 및 전기요금의 차액을 계산하고 신규투자비를 고려하여 단순 투자비 회수를 토대로 도입에 대한 경제성을 분석하였다. 열병합설비의 투자비 회수기간은 약5년 정도로 경제성 및 도입 가치가 충분히 있으며, 이자율 하락이나 정량적으로 계산하기 어려운 환경문제 개선비용 및 전기요금의 증가를 고려하면 실제적으로는 더욱 경제성이 있음을 알 수 있다.

• Computers and Concrete
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• 제3권4호
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• pp.197-212
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• 2006

Modeling of physically non-linear behavior becomes more and more important for the analysis of SFRC structures in practical applications. From this point of view we will present an effective, three-dimensional constitutive model for SFRC, that is also easy to implement in commercial finite element programs. Additionally, the finite element analysis should only require standard material parameters which can be gained easily from conventional experiments or which are specified in appropriate building codes. Another important point is attaining the material parameters from experimental data. The procedures to determine the material parameters proposed in appropriate codes seem to be only approximations and are unsuitable for precise structural analysis. Therefore a finite element analysis of the test itself is used to get the material parameters. This process is also denoted as inverse analysis. The efficiency of the proposed constitutive model is demonstrated on the basis of numerical examples and their comparison to experimental results. In the framework of material parameter identification the idea of a new, indirect tension testing procedure, the "Modified Tension Test", is adopted and extended to an easy-to-carry-out tension test for steel fiber reinforced concrete specimens.

• Current Photovoltaic Research
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• 제2권3호
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• pp.79-83
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• 2014

Dye-sensitized solar cells (DSSCs) are applied in the emerging fields of building integrated photovoltaic and electronics integrated photovoltaic like small portable power sources as demands are increased with characteristic advantages. Highly flexible dye-sensitized solar cells (DSSCs) prepared on single stainless steel mesh were proposed in this paper. Single mesh DSSCs structure utilizing the spraying the chopped glass paper on the surface treated stainless steel mesh for integrating the space element and the electrode components, counter electrode component and photoelectrode component were coated on each side of the single mesh. The fabricated single mesh DSSCs showed the energy-conversion efficiency 0.50% which show highly bendable ability. The new single mesh DSSCs may have potential applications as highly bendable solar cells to overcome the limitations of TCO-based DSSCs.