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액비순환시스템이 적용된 비육돈사의 초여름과 가을의 암모니 아 및 황화수소 배출량 평가
위지수 ( Jisoo Wi ),이승훈 ( Seunghun Lee ),김은종 ( Eunjong Kim ),이명성 ( Myeongseong Lee ),안희권 ( Heekwon Ahn ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1
본 연구는 액비순환시스템이 적용된 비육돈사에서 계절에 따른 돼지의 악취물질 배출량을 평가하기 위해 수행되었다. 연구수행을 위해 자체개발한 실시가 악취 모니터링 시스템을 사용하여 80kg 대 비육돈 240두(사육밀도: 0.69 m2/두)를 대상으로 초여름(5월)과 가을(10월) 각 2주간 암모니아와 황화수소 농도, 환기량을 실시간 모니터링하였다. 본 연구결과, 가을철 액비순환시스템이 적용된 돈사에서 비육돈 한 마리는 하루에 암모니아 6.6±2.4 g, 황화수소 338±92 mg을 배출하였다. 초여름에는 일일 두당 암모니아 24.5±2.7 g, 황화수소 893±222 mg을 배출하여 가을철과 비교 시각각 3.7, 2.6 배 높은 경향을 보였다. 여름철 높은 가스 배출량의 주요 원인은 환기량 증가에 의한 것으로 사료되며, 여름철 시간당 두당 환기량은85.9±16.1 m3으로 가을철(47.0±9.0 m3)에 비해 약 1.8배 높았다. 또한 여름철과 가을철에 이용된 사료 내 조단백질 함량은 각각 18.4, 17.5%(d.b.)로, 가을과 비교 시 약 5% 높은 여름철 조단백질 함량은 암모니아 배출량에 크게 영향을 미친 것으로 판단된다.
Stacked Gold Nanodisks for Bimodal Photoacoustic and Optical Coherence Imaging
Wi, Jung-Sub,Park, Jisoo,Kang, Heesung,Jung, Donggeun,Lee, Sang-Won,Lee, Tae Geol American Chemical Society 2017 ACS NANO Vol.11 No.6
<P>Herein, we report on biological imaging nanoprobes: physically synthesized gold nanodisks that have inherent optical advantages a wide range of resonant wavelengths, tunable ratio of light absorption-to-scattering, and responsiveness to random incident light due to their two-dimensional circular nanostructure. Based on our proposed physical synthesis where gold is vacuum deposited onto a prepatterned polymer template and released from the substrate in the form of a nanodisk, monodisperse two-dimensional gold nanodisks were prepared with independent control of their diameter and thickness. The optical benefits of the Au nanodisk were successfully demonstrated by the measurement of light absorbance of the nanodisks and the application of stacked nanodisks, where a smaller sized Au nanodisk was laid atop a larger nanodisk, as bimodal contrast agents for photoacoustic microscopy and optical coherence tomography.</P>
Jeon, Jisoo,Park, Ji Hun,Wi, Seunghwan,Yang, Sungwoong,Ok, Yong Sik,Kim, Sumin Academic Press 2019 Environmental research Vol.172 No.-
<P><B>Abstract</B></P> <P>One approach to enhance the energy efficiency of buildings is the integration of construction materials of latent heat storage biocomposites, which are prepared by vacuum impregnating the phase change material into biochar. Biochar is used because it is highly utilized and environmentally-friendly, and the selected phase change materials are fatty acid type which are bio-based material and have a low risk of depletion. Experimental results showed that latent heat storage biocomposite possesses excellent exudation and thermal stability as characterized by 0.1727 W/mK of thermal conductivity comparable to that for a gypsum board, and good chemical compatibility as its amount of latent heat tends to decrease as compared with that of pure phase change material. Results of the numerical analysis showed further that latent heat storage biocomposite efficiently reduced the maximum energy consumption of reference building models by 531.31 kWh per year. Thus, both results validate the claim that latent heat storage biocomposite is a promising building material.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Latent heat storage biocomposite was prepared from eco-friendly biochar and bio-based phase change materials. </LI> <LI> Experiments and numerical analyses were performed. </LI> <LI> Integration of latent heat storage biocomposite into building walls reduced annual building energy consumption. </LI> <LI> Latent heat storage biocomposites can be used as sustainable building materials. </LI> </UL> </P>
Ammonia and Hydrogen Sulfide Removal from Swine House Exhaust Air Using a Dip Injection Wet Scrubber
Myeongcheol Shin,Seunghun Lee,Jisoo Wi,Heekwon Ahn 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6
This study was conducted to evaluate the odor reduction efficacy of the dip injection wet scrubber (DIWS) using tap water as washing fluid. The NH₃ and H₂S removal efficiency of 7 day batch operated DIWS was evaluated twice over a total of 14 days of experiment. The NH3 removal efficiency ranged from 26 to 37%. The H₂S removal efficiency was between 22 and 30%. The pH of the washing fluid maintained below 8 and the NH₄<SUP>+</SUP> concentration tended to keep constant around 350 ppm after 5 days of washing-fluid replacement. Therefore, the 5-day washing fluid replacement interval is more preferable than the 7-day interval. The NH₄ <SUP>+</SUP> concentration and the electrical conductivity (EC) showed a high correlation. The EC measurement can be used as an alternative to conventional NH₄ <SUP>+</SUP> concentration measurement method for real time monitoring of washing fluid condition.
Ammonia and Hydrogen Sulfide Removal from Swine House Exhaust Air Using a Dip Injection Wet Scrubber
Shin, Myeongcheol,Lee, Seunghun,Wi, Jisoo,Ahn, Heekwon 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6
This study was conducted to evaluate the odor reduction efficacy of the dip injection wet scrubber (DIWS) using tap water as washing fluid. The $NH_3$ and $H_2S$ removal efficiency of 7 day batch operated DIWS was evaluated twice over a total of 14 days of experiment. The $NH_3$ removal efficiency ranged from 26 to 37%. The $H_2S$ removal efficiency was between 22 and 30%. The pH of the washing fluid maintained below 8 and the $NH_4{^+}$ concentration tended to keep constant around 350 ppm after 5 days of washing-fluid replacement. Therefore, the 5-day washing fluid replacement interval is more preferable than the 7-day interval. The $NH_4{^+}$ concentration and the electrical conductivity (EC) showed a high correlation. The EC measurement can be used as an alternative to conventional $NH_4{^+}$ concentration measurement method for real time monitoring of washing fluid condition.
Park, Ji Hun,Lee, Jongki,Wi, Seunghwan,Jeon, Jisoo,Chang, Seong Jin,Chang, Jae D.,Kim, Sumin Elsevier 2019 Energy and buildings Vol.185 No.-
<P><B>Abstract</B></P> <P>Worldwide growth and the pursuit of comfort in buildings have led to significant increase in energy consumption, which is considered a current issue. Phase change material (PCM), a thermal energy storage (TES) material, is considered an effective and promising material to reduce energy consumption. In recent years, research on the application of PCM to provide higher comfort for occupants has been growing rapidly. Studies show that it is necessary to consider the optimized phase change temperature of PCMs within the comfort temperature and specific climate conditions. Thus, the objective of this study is to investigate the best optimized PCM under thermal comfort range in the climate conditions of South Korea, and analyze the energy savings of PCMs, using DesignBuilder. The prepared PCMs were <I>n</I>-octadecane (OT), <I>n</I>-heptadecane (HT), and <I>n</I>-hexadecane (HX), which phase change temperatures were close to the thermal comfort range. The results of the circulation water bath test showed that the phase change temperature of the mixed PCMs by OT and HT was (22–23) °C, within the thermal comfort range. According to the various mixing ratios of OT to HT, the phase change temperatures of PCMs for OH91, OH73, OH55, OH37, and OH19 appeared at ((24–26), (23–24), (22–23), (21–23), and (20–22)) °C, respectively. For energy simulation, gypsum boards with OT, OHs, and HT were prepared, and analyzed by replacing conventional gypsum board of the standard residential construction house model in South Korea. As a result, the maximum energy savings were shown by OH73 in cooling, and OH19 in heating. Consequently, the maximum total energy savings were achieved for OH73, which means that the best optimized PCM for South Korea demonstrated a phase change temperature of (23–24) °C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Optimization of PCM within comfort temperature in South Korean climate was investigated. </LI> <LI> PCM melting temperature of 24 °C were optimized in cooling. </LI> <LI> PCM melting temperature of 21 °C were optimized in heating. </LI> <LI> There are many variables to improve the efficiency of PCM for energy saving. </LI> </UL> </P>