카페트에 의해 오염된 공기질과 생산성

백용규(Yong-Kyu Baik),방승기(Seung-Ki Pang) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.4

This study examines the effect of old carpet on indoor air quality since the carpet is considered to be one of the sources of air pollution in indoor space. Experiments were performed in order to investigate how the air contaminated by the pollutants influences on the residents' productivity. The results are as follow. The more pollutants existed in the space the less satisfaction the residents had. Therefore, the carpet reduced the level of satisfaction by 3%. When carpets were installed the productivity decreased compared with the case when carpet was not installed.

열환경 시뮬레이션에 의한 부분온돌 난방공간의 열특성

백용규(Yong-Kyu Baik),안병욱(Byung-Wook Ahn),손장열(Jang-Yeul Sohn) 한국생활환경학회 1995 한국생활환경학회지 Vol.2 No.2

공동주택용 풍량분배기의 성능 평가

백용규(Baik Yong-Kyu),정용호(Jung Yong-Ho) 한국건축친환경설비학회 2009 한국건축친환경설비학회 논문집 Vol.3 No.4

It is common to design the duct branches where to supply the required air flow for individual room in a residential apartment house. However it is difficult to adjust the air volume adequately in small air duct branches in residential ventilation system. The purpose of this study is to figure out the performance of Multidrop chamber coupling system for the residential ventilation system. The experiments were designed to evaluate Multidrop chamber system in apartment units of 84 . Multidrop chamber duct and general duct were established on the ceiling of the apartment to evaluate the distribution performance of air supply rate. As a result, distribution deviation of air supply rate in the multidrop chamber system is different from designed air supply rate by -3% ~ 10%. Therefore, the Multidrop chamber system is considered to satisfy proper air supply rate of each room in Apartment Houses.

난방시스템 최적 셋백온도 적용시점 예측을 위한 인공신경망모델 개발

백용규(Baik, Yong Kyu),윤연주(Yoon, younju),문진우(Moon, Jin Woo) 한국생태환경건축학회 2016 한국생태환경건축학회 논문집 Vol.16 No.3

다양한 염을 첨가한 쑥두부의 품질 특성

백용규(Yong-Kyoo Baik),김성훈(Sung Hun Kim),박인식(Inshik Park) 한국식품영양과학회 2008 한국식품영양과학회지 Vol.37 No.10

두부 제조 시 응고제로 CaCl2을 사용하고, 두부에 간을 배게 하여 두부의 맛에 대한 품질향상을 목적으로 정제염, 천일염, 죽염, 심층해염을 첨가한 실험군 쑥두부와 염을 첨가하지 않은 대조군 쑥두부의 수율, 일반성분, 조직감 측정 및 관능검사를 실시하였다. 천일염, 죽염, 심층해염을 첨가한 쑥두부의 수율은 202.29%~207.50%로 염을 첨가하지 않은 대조군의 수율 185.1%에 비하여 통계적으로 유의하게 (p<0.001) 높았다. 그리고 조지방, 조단백질, 조회분의 함량은 다양한 염을 첨가한 실험군 쑥두부가 염을 첨가하지 않은 대조군에 비하여 통계적으로 유의하게(p<0.001) 높게 나타났다. 조직감 측정에서는 hardness와 gumminess에서 실험군 쑥두부가 대조군 쑥두부보다 유의적으로(p<0.05) 높은 값을 보였지만 brittleness와 cohesiveness, chewiness에선 유의적인 차이점을 찾지 못하였다. 관능검사 결과는 경도와 탄력성에선 유의적인 차이점이 없었지만 짠맛, 구수한 맛, 씹힘성, 전체적 기호도에선 대조군 쑥두부보다 염을 첨가한 실험군 쑥두부가 통계적으로 유의하게(p<0.001) 높은 점수를 받았으며, 특히 죽염 쑥두부와 심층해염 쑥두부에서 두부맛에 영향을 미치는 구수한 맛과 전체적 기호도에서 높은 점수를 받았다. This study was conducted to evaluate the quality characteristics of mugwort-tofu prepared by purified salt (A1), sun-dried salt (A2), bamboo salt (A3), and deep ground water salt (A4) in addition to CaCl₂ as coagulants. Addition of various salts with CaCl₂ increased yield of the tofu resulting in high content of lipid, protein and mineral contents of mugwort-tofu. Sun-dried salt was most effective in yield of the tofu among tested salts. It was also most efficient in increasing protein, and lipid contents of the tofu. The amounts of Ca, K, Mg, and Na were highest in mugwort-tofu prepared with sun-dried salt, while they were lowest in the tofu with deep ground water salt. The texture analysis showed the tofu prepared with various salts generally increased the hardness and gumminess of the tofu significantly. The sensory evaluation of the tofu with various salts demonstrated that the saltiness, tastiness, chewiness, and overall acceptance were enhanced significantly. Among tested salts, bamboo salt showed the highest overall acceptance in mugwort-tofu, followed by deep ground water salt, purified salt, and sun-dried salt.

소규모 개인 사무소 공간의 조도증감에 대한 조명사용자의 시각적 만족도 예측

백용규(Yong-Kyu Baik),김수영(Sooyoung Kim) 한국생활환경학회 2020 한국생활환경학회지 Vol.27 No.6

This study examines the effects of illuminance fluctuations on occupants" visual perception and comfort in a small private office. Experiments were conducted in an actual office space, where six fluorescent lighting fixtures were installed and no daylight was available. Twelve healthy college students participated and five fluctuation ranges were applied to the 500 lx of task illuminance on desktops. Reading tasks using a computer and monitor were conducted, while the experiments were performed. Results imply that the level of visual satisfaction was impaired noticeably as the fluctuation ranges increased. The fluctuation range of desktop illuminance should be maintained within 63.34 lx to guarantee visual satisfaction. The perception for visual distraction and stimulus showed a similar tendency as the fluctuation ranges varied. In order to avoid the visual sensation for distraction and stimulus, the fluctuation ranges should be within 97.21 lx and 104.59 lx, respectively. Regression results indicate that the perception for visual satisfaction was affected by the perception for visual distraction, visual stimulus and visual warmness. The visual distraction was the strongest influential factor to the visual satisfaction. The increase of mean vote by 1 on the voting scale led to the decrease of visual satisfaction by 0.441 on the voting scale.

소규모 사무실 공간의 조명에너지 절약을 위한 제어 분석

백용규(Yong-Kyu Baik),김수영(Sooyoung Kim) 한국생활환경학회 2014 한국생활환경학회지 Vol.21 No.6

This study investigates control performance of daylight dimming control system under various sky conditions in order to examine the influence of daylight conditions on dimming performance. Field measurements were conducted in a full-scale mock-up model to collect actual data and computer simulations were performed to determine light output of fixtures. Results indicate that the variation patterns of desktop illuminance were similar to those of illuminance arriving at window. The direct component of daylight affected photosensor illuminance generating strong reflected components from wall surfaces. Relationship between desktop and photosensor illuminance was stronger than that of between window and photosensor. This implies that desktop illuminance was effective to predict the variation of photosensor illuminance. Compared to overcast sky conditions, dimming control was effective under clear sky and achieved good energy savings. Under overcast sky conditions, excessive dimming occurred due to the influence of electric lighting. It appears that control algorithm or photosensor conditions should be reset in order to block light input to photosensor and generate less dimming from lighting fixtures.

소규모 사무실에서 포토센서 기반 디밍시스템의 성능에 대한 제어 알고리즘의 영향

백용규(Yong-Kyu Baik),김수영(Sooyoung Kim) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.6

This study discusses the system performances of photosensor-based dimming controls in a small office with a lightshelf. Computer simulations using the Lightscape software were conducted for a variety of daylight conditions. Four control algorithms were employed, and partially-shielded and unshielded photosensors were used to predict dimming levels. Results indicate that control algorithms containing constant and power functions caused excessive dimming and failed to achieve target illuminance under all sky conditions. A linear algorithm showing relatively insensitive dimming levels to photosensor illuminance was appropriate to achieve the optimum system performance under clear sky, when the photosensor was partially-shielded. In this case, the lighting energy savings ranged from 33.3 % to 74.5 %. The system performance of dimming control based on the four algorithms under overcast sky provided excessive dimming and led to failures of controls. The unshielded photosensors failed to provide the target illuminance under the majority of conditions. The linear regression models between the outdoor global daylight illuminance and photosensor illuminance due to daylight were statistically meaningful with strong correlations.

교실 조명환경 개선을 위한 최적 주광활용 방안

백용규(Yongkyu Baik),김수영(Sooyoung Kim) 한국생활환경학회 2012 한국생활환경학회지 Vol.19 No.5

This study examines the effect of a daylight dimming control system to improve visual environment in a classroom. Computer simulations were conducted for a variety of daylight conditions. Results indicate that correlation between desktop illuminance by daylight and photosensors signals by daylight were stronger in rear area of space compared to that in areas close to window. This implies that the photosensors installed in rear area might contribute to dimming control performance only in a case that daylight was considered. Overall, the photosensor in rear area failed to keep target illuminance due to strong impact of electric light output. An electric circuit connected to all lighting fixtures in space should be divided to keep target illuminance for rear area, when a daylight dimming control system is applied. The probability for an optimum control performance decreased as the distance from window to desktops increased beyond 5 m. For the area where electric light was stronger than daylight, photosensors should not be exposed to electric light directly so that photosensor signals remain within desirable ranges for optimum control. In addition, more shielding condition should be applied to photosensors installed in the rear area of space.

포토센서의 민감도에 따른 자연광을 고려한 인공조명 제어시스템 성능

백용규(Yong-Kyu Baik),김수영(Soo-Young Kim) 한국생활환경학회 2007 한국생활환경학회지 Vol.14 No.2

This study examines the control performance of a photosensor dimming control system in a small office according to three different photosensor sensitivity. Computer simulations were performed for the office with a double skin envelope system under various daylight conditions. Horizontal blind was considered to be installed on the external envelope and a retractable fabric shading device was installed on the internal envelope. Three sky conditions recommended by CIE were used at different times of a day and year. A partiailly-shielded photosensor was placed at the center of ceiling. Photosensor with the most sensitive level to daylight failed to achieve target illuminance providing less light output. The sensor with the least sensitive level provided excessive light output and resulted in overshooting the target illuminance. The sensor with medium sensitive level achieved good control performance and successfully provided target illuminance with reduced light output. The correlation between destkop illuminance and photosensor illuminance due to daylight was greater than 0.79. Reasonable lighting energy savings was achieved by the partially-shielded photosensor with medium sensitivity.