• 한국항공우주학회지
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• 제33권9호
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• pp.89-96
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• 2005

이 논문에서는 주간 항법용 별센서의 실제 활용을 목적으로 주간 대기 조건과 주간 별 감지 가능성을 논한다. 주간동안의 대기 자료를 구하기 위해 표준 대기 모델(LOWTRAN 7)을 사용했으며 그 모델로부터 배경하늘에 대한 복사와 대기투과도를 구하였다. 대기 복사량을 감소시키기 위해 광학 필터를 장착한 별센서를 가정했으며 태양 복사 효과를 나타내기 위해 별센서와 태양 사이의 다양한 분리각을 설정하였다. 별센서의 FOV에 대한 고려로서, 하늘 배경 복사의 변화와 감지가능한 별의 개수 밀도를 분석하였다. 또한 요구되는 신호 대 잡음비를 얻기 위한 노출시간과 별센서의 주간 활용 한계로서 작용하는 CCD의 복사에 의한 전자 수를 계산하였다.

• 한국태양에너지학회 논문집
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• 제22권3호
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• pp.47-56
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• 2002

The office is an excellent candidate for implementing daylighting techniques because of the relatively high electric lighting power densities and long daytime use pattern. The quantity of light available for a space can be translated in term of the amount of energy savings through a process of a building energy simulation. To get significant energy savings in general illumination, the electric lighting system must be incorporated with a daylight - activated dimmer control. A prototype configuration of an office interior has been established and the integration between the building envelope and lighting and HVAC systems is evaluated based on computer modeling of a lighting control facility. First of all, an energy-efficient luminaire system is designed for both a totally open-plan office interior and a partitioned office. A lighting design and analysis program, Lumen-Micro 2000 predicts the optimal layout of a conventional fluorescent lighting fixture to meet the designed lighting level and calculates unit power density, which translates the demanded amount of electric lighting energy. A dimming control system integrated with the contribution of daylighting has been applied to the operating of the artificial lighting. Annual cooling load due to lighting and the projecting saving amount of cooling load due to daylighting under overcast diffuse sky are evaluated by a computer software, ENER-Win. In brief, the results from building energy simulation with measured daylight illumination levels and the performance of lighting control system indicate that daylighting can save over 70 percent of the required energy for general illumination in the perimeter zones through the year. A 25 % of electric energy for cooling may be saved by dimming and turning off the luminaires in the perimeter zones.

• 한국태양에너지학회 논문집
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• 제31권6호
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• pp.103-110
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• 2011

The aim of this study was to analysis the Heating/cooling performance and Daylighting performance of Solar Window System built in apartments. the solar window is the idea to integrate daylight as a third form of solar energy into a PV/Solar Collector system. The process of this study is as follows: 1)Solar Window system was designed through the investigation of previous paper and work. 2)The simulation program(Lightscape3.2) was used in daylighting performance analysis. the reference model of simulation was made up to analysis daylighting performance on Solar Window system. 3)The simulation program(ESP-r, Therm5.0, Window6.0) was used in energy performance analysis. the reference model of simulation was made up to analysis energy and daylighting performance on Solar Window system. 4)The Size of Simulation model for daylighting and heating/cooling energy analysis was $148.5m^2$ 5)The lighting performance analysis was carried out with various variants, such as the size and installed area of Solar Window system. 6)Energy performance simulation was carried out with various variants, such as Integrated U-value of Solar Window system according to its position, installed angle and insulation thickness. Consequently, When Solar Window system is equipped with balcony window of Apartment, Annual heating and cooling energy of reference model was cut down at the average of $4.1kWh/m^2$ or 4.2%.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.229-232
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• 2003

The stereographic projection method accesses the stability of slope roughly, so it is difficult to apply its result in the technical designing of rock slopes. To solve this difficulty, using the limit analysis method, we quantified the stereographic projection with the safety level graded in the daylight envelope, which represents the failure possible area in the net.

• 대한건축학회논문집:계획계
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• 제35권8호
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• pp.23-34
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• 2019

The façade, a fundamental function as a skin that protects human life from external environment such as cold and hot weather, snow, rain, and wind, etc, has served as a media for communication between indoor space of the building and outside space. From the media for communication point of view, the approach to envelope design, in which environmental elements are transmitted internally through the filtering of external environments, has been evolving in various ways from the past to the present. Today, modern architecture technologies including curtain wall systems and user-friendly computer programming and environmental analysis programs demonstrate a differentiated approach to envelope design related to the indoor environment. For this reason, it is worth noting that the envelope design factors and trends that appear variously in the UNStudio's projects before and after the 2000s. The factors reflected in the envelop design in conjunction with the indoor environment obtained through the case study of the UNStudio's office projects were daylight environment, thermal environment, ventilation, noise, privacy and view, and consideration for daylight environment and thermal environment was reflected in many cases through the case study. Looking at the changes in the diagrams in order of year, it can be seen that the envelope design using the environmental analysis tool has been performed since 2006. This is a clue to show the envelop design changes from the conceptual method to the data-based one. The diagrams and analysis results related to the envelop design showed that the thermal environment related to solar radiation was the most, and no diagrams and analysis related to the indoor illumination were found. Since 2010, PV panel installation has been shown in the envelope design, which can be found in the increased efficiency of PV panels due to the technological advances and the decrease in production cost.

• Journal of Astronomy and Space Sciences
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• 제22권3호
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• pp.273-282
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• 2005

주간에 활용될 수 있는 별 센서의 성능을 알아보기 위해, 주간 별 센서 관측 모델을 개발하였다. 주간 동안 별 센서가 감지하게 될 별들에 대한 중심찾기 오차는 그 모델을 사용해서 계산되었다. 별 센서가 운용되는 주간 환경의 대기 물리량을 계산하기 위해 표준 대기 모델(LOWTRAN7)이 사용되었다. 주간 별 센서 관측 모델에는 별과 태양 사이의 다양한 분리각, 중심찾기 알고리즘, 그리고 별 센서의 다양한 시스템 특성이 고려되었다. 개발된 별 센서 모델은 벡터 관측을 통한 자세결정 성능의 예측에 있어서 보다 현실적인 오차 정보를 제공하게 될 것이다.

• 한국주거학회논문집
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• 제24권3호
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• pp.1-8
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• 2013

The University students learn their major or a general education in lecture rooms. In these days, lecturer use frequently various multimedia in lecture room. Appropriate control lighting environment in lecture room should be essential and related in efficient studying. Daylighting on front-side of lecture room will cause glare and students are hard to read contents on white-board at their seat. Therefore, in order to preventing glare we simulated daylighting of lecture room with using computer software in this study. Results from simulation and analysis as follows: The first, if students' left-side is east-oriented in lecture room, best daylighting condition about glare in lecture room. The second, architectural designers can use simulation data of daylighting or simulate data in designing university buildings with lecture rooms. Finally, if reducing size of windows (narrow and deep daylight: more closing vertically, from up to down daylighting: more closing horizontally) we will be able to reduce energy from lecture room.

• KIEAE Journal
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• 제13권3호
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• pp.97-104
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• 2013

This proposed simulation-based design study is based on the design of residential high-rise buildings in South-Korea. the purpose of this study is to evaluate the amount of daylighting performance passing through building glazing according to sky conditions, orientation of windows and each space of Apartment buildings. The clear sky includes sunshine and is intense and brighter at the horizon than at the zenith, except in the area around the sun. Daylight received within a building is directly dependent upon the sun's position and the atmospheric conditions. Orientation of the building generally used to refer to solar orientation which is the siting of building with respect to solar access. Although any building will have different orientations for its different sides, the orientation can refer to a particular room, or to the most important facade of the building. north-facing windows receive twice the winter sun than east and west facing windows, allowing light and warmth into the home. They can be easily shaded from the high summer sun to help keep the house cool. Ideally, the glazing area should be between 10-25% of the floor area of the room. This paper was calculated by a Desktop Radiance program. The space dimensions were based on a unit module of real constructed apartment having divided into five sections such as living room, room1, room2, room3 and kitchen.

• KIEAE Journal
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• 제13권5호
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• pp.59-66
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• 2013

Current Architectural Facade Designs have been trending to increased glass areas resulting in increasing impact on interior lighting and daylighting. In regards to indoor environmental quality, the increase in window space has a large impact on the daylighting received which ultimately impacts the liveability of a space. Especially when considering seasons, in the summer, excessive daylighting can result in glare as well as put an increased load in conditioning the air space further reducing energy efficiency. As a result, in order to improve the sustainability performance of a building, it is important to limit the natural lighting exposure to properly meet the needs and conditions of the building occupants. One of the most representative features to limit excessive sunlight exposure, is to incorporate operable blind systems. To this end, this research has been based on simulations performance through the Radiance Program. Radiance is capable of analyzing performance of daylight and impact of sunlight. Through analysis of different slat angles and blind shapes, impact and minimization of energy usage was evaluated. Furthermore, seasonal analysis was performed in order to understand the effects of seasonal climate factors. Ultimately this research provides an analysis of operable blinds optimization and effects of blind shape, control factors and angle of shading.

• 토지주택연구
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• 제13권1호
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• pp.131-140
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• 2022

스마트 윈도우는 건물의 에너지 절감을 실현할 수 있는 신소재 건축 자재이며, 상황에 따라 가시광선 투과율(Visible Light Transmittance), 일사획득계수(Solar Heat Gain Coefficient, g-value)를 자유롭게 조절할 수 있는 특징을 가진다. Electrochromic(EC), Suspended Particle Device(SPD), Polymer Dispersed Liquid Crystal(PDLC) 등이 스마트 윈도우에 해당되며 현재 실용화 단계에 있다. 최근 스마트 윈도우의 VLT 및 g-value 조절 기능을 통해 건축물의 에너지를 절감하는 방법에 대한 연구가 활발하게 진행되고 있으며, 일부 유의미한 결과가 도출되고 있다. 하지만, 건축물의 에너지 절감에 대해서 연구의 영역이 제한되어 있고, 실내 환경에 대한 연구는 다소 부족한 실정이다. 에너지 절감에만 초점을 맞춘 실내 공간은 충분한 쾌적성이 확보되지 않기 때문에 실내 환경에 대한 고려가 요구된다. 따라서 이 연구에서는 사무공간을 기준으로 채광성능(Daylight Performance) 분석이 수행되었다. 세계 각 국의 친환경 건축인증제도인 LEED, BREEAM, CASBEE, G-SEED의 기준을 통해 스마트 윈도우의 VLT 조절에 따른 채광성능 검토가 이루어졌으며, 쾌적한 실내 채광환경을 유지할 수 있는 스마트 윈도우의 VLT 범위에 대한 고찰이 이루어졌다. 분석을 위해 사용된 스마트 윈도우는 VLT 조절 범위가 가장 넓은 EC가 사용되었다. 분석 결과 한국의 친환경 건축인증제도인 G-SEED의 평균주광률을 충족하기 위한 스마트 윈도우의 최소 VLT는 25% 이상으로 나타났으며, 스마트 윈도우의 VLT 조절은 균제도에 유의한 영향을 미치지 않는 것으로 나타났다. 또한, LEED의 실내 최소조도의 기준을 적용할 시 적용되어야 하는 계절 및 향에 대한 스마트 윈도우의 VLT 조절 범위 값이 도출되었다.