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김윤지(Yun-Ji Kim),신일섭(Il-Seop Shin),오승택(Seung-Taek Oh),임재현(Jae-Hyun Lim) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.11
자연광과 동기화된 빛을 제공하여 생체리듬 유지 등 건강을 지원하는 Circadian Lighting의 개발 노력들이 계속되고 있다. 이전의 방법들은 특정일 하루에 대한 색온도 주기를 제공하여 365일 계속 변화하는 자연광의 특성을 반영하지 못하였거나, 서버와 스마트폰 앱의 연동이 필수로 요구되는 등 구현상의 제약이 많다는 한계가 있다. 이에 본 논문에서는 연중 상시 변화하는 자연광의 특성 재현을 위해 일별 자연광 색온도 주기를 생성하는 산술식을 제안한다 매월별 실측 색온도 주기를 대표하는 회귀식을 도출하고 회귀식과 월별 색온도 주기와의 평균편차를 계산한 후 상대 시간을 입력하여 일별 색온도 주기를 생성하는 수식을 유도하였다. 수식을 통해 년 중 특정일에 대한 색온도 주기를 생성하도록 하였고, 성능 실험에서는 선정일 하루에 대한 색온도의 실측치 대비 평균절대오차 45K 이내에서 자연광의 색온도 주기를 재현하였음을 확인하였다. Efforts are continuing to develop circadian lighting to support health such as maintaining circadian rhythm by providing light which is synchronised with natural light. The previous methods have limitations in that they only provided a color temperature cycle for a specific day, therefore they could not reflect the characteristics of natural light that changes continuously for 365 days, or it had to be linked to server and the smartphone app, making it difficult to be implemented. Therefore, this paper proposes an arithmetic formula that generates daily color temperature cycle of natural light to reproduce characteristics of natural light that keeps on changing throughout a year. A regression equation that represents monthly measured color temperature cycle was derived, and the average deviation between the regression equation and monthly color temperature cycle was calculated. A formula for generating a daily color temperature cycle was then derived by inputting the relative time. Color temperature cycle for a specific day in a year could be generated through the developed formula. In addition, it was proved through the performance test that the color temperature cycle of natural light was realised within mean absolute error of 45K for the selected one day.
강당의 기본계획 단계에서 객석수 및 규모에 의한 잔향시간 예측에 관한 연구
조창근(Chang-Geun Cho),신일섭(Il-Seop Shin) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.1
It is very difficult for architect to predict the reverberation time of auditorium in it's architectural basic design stage because it is dependent on volume and surface area of auditorium, number of audience, and finishing materials. The purpose of this study is to propose the easy prediction method of reverberation time of auditorium with balcony floor in the early design stage of it. For the purpose of it, the prediction method of reverberation time is developed by simplifying the shape of auditorium. And, the measured reverberation time of the existed auditorium is compared with the predicted value. As the result, the correlation coefficient of surface area between the real and the simplified shape of auditorium showed to be R²=0.9138 after regression analysis of them for examining the developed predicted model. The predicted reverberation time was good agreement with the measured value in the subject auditoriums in this study. And, the reverberation time nomograph is created on the basis of the developed prediction method of it by the number of audience and volume of auditorium.
○○농수산물유통센타 경관조명 설계 안 및 Simulation 분석 평가
차광석(Cha Kwang-Seok),신일섭(Shin Il-Seop) 한국조명·전기설비학회 2001 한국조명·전기설비학회 학술대회논문집 Vol.2001 No.-
Changing to a 24-hour urbanistic life style, a night time activities constituted for a major portion. Important of a beautiful exterior lighting as well as safety, and security concerns become increasingly. However, the removal or control of the excessive lighting is considered more important then increasing the brightness of the lamps to achieve bother safety and security. Representing a cheerful and leisure environment from the exterior lighting can also harmonize two aspects of energy saving and sustaining green environment. Designing of exterior lighting at the ○○ Agricultural & Fishery Circulation center symbolizes the suitability, convenience and production. It"s design and analysis represent the optimum urban night time environment.
조창근(Chang-Geun Cho),신일섭(Il-Seop Shin) 한국생활환경학회 2007 한국생활환경학회지 Vol.14 No.1
It is important to increase the sound proof performance of building for reducing the influence of aircraft noise on the basis of actual survey of existed buildings. The purpose of this study is to propose the basic data for designing sound insulation of residential house. In this study, field measurement of aircraft noise and indoor and outdoor noise level difference were carried out for 7 days in 6 rural residential houses. Subjective responses to aircraft noise were examined by 296 questionnaires in that area as well. As the result, aircraft noise levels showed to be Leq 59.1~74.2 ㏈(A), WECPNL 71 over, and indoor noise levels were NC-35~53 over acceptable NC-30 in 6 measured houses. Percentage of answers was respectively very high in loudness and noisiness, and annoyance of aircraft noise. Consequently, it is thought that the residents should be usually influenced on their life by aircraft noise in examined area. Noise reduction effect showed to be 13.6~30.5 ㏈(A) in measured houses, and houses with double window were preferable to those with single window in sound proof performance. Comprehensive architectural technological examination should be needed as the air-tight window and the double wall, etc.
공동주택 기계실 설비기기의 진동 및 전달특성에 관한 연구
조창근(Chang-Geun Cho),신일섭(Il-Seop Shin) 한국생활환경학회 2008 한국생활환경학회지 Vol.15 No.1
It is necessary to understand the vibration characteristic of building equipment for establishing appropriate evaluation guidelines of vibration generated from them in buildings. The purpose of this study is to propose the basic data for appropriate evaluation and design strategy of vibration from building equipment by analyzing vibration and its propagation from them. In this study, field measurement of vibration acceleration level from building equipment in mechanical facility room and bathrooms were carried out in the subjected apartment building. Vibration acceleration levels and their propagation through the structure, and coherence functions among the vibration signals were analyzed as well. As the result, the vibration acceleration levels were 81.4~91.0 ㏈ in the measured building equipment, and their peak levels showed in the frequencies under 100 ㎐. Vibration reduction of the boiler was 35 ㏈, that of the fan was 17.8 ㏈, and that of the generator was 7.5 ㏈ in the propagating path. The coherence functions between walls and floors were over 0.5 in the frequencies under 100 ㎐ by the vibration propagation through walls.
실시간 자연광 재현을 위한 색온도 최저점 탐색 알고리즘
오승택(SeungTeak Oh),가덕현(DeogHyeon Ga),신일섭(Il-Seop Shin),임재현(JaeHyun Lim) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.11
인체 생체리듬의 유지를 지원하기 위해 자연광의 색온도 주기를 실시간으로 제공하는 조명 기술들이 연구되고 있다. 그러나 자연광의 색온도는 날씨나 기후 등의 영향으로 불규칙적인 분포 특성을 보이는 경우가 많으며 색온도 주기의 길이와 높낮이의 변화폭이 달라 실시간으로 시작과 끝 시점을 특정하기 어렵다. 이에 본 논문에서는 실시간 자연광 색온도 주기의 재현을 위해 일출과 일몰 부근 색온도의 최저점을 탐색하는 알고리즘을 제안한다. 실측 자연광 색온도를 기반으로 한 성능평가에서는 평균 ±1%의 시간 범위 내에서 색온도의 최저점을 정확히 탐색하였고 실시간 자연광 색온도 재현 시에 적용이 가능함을 확인하였다. Lighting technologies that provided color temperature cycle of natural light have been studied to maintain human circadian rhythm. However, the color temperature of natural light often shows irregular distribution due to influence by weather or climate, and it is difficult to specify the start and end points in real time because the changing patterns of length and height of the color temperature cycle are different. Therefore, this paper proposes an algorithm that searches a lowest point of color temperature near sunrise and sunset to reproduce color temperature of natural light in real time. Through the performance test, it was proved that the proposed formula could accurately searched the lowest point of the color temperature within the time range of ±1% on average, and it could be applied to real-time natural light color temperature reproduction.