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Jo, Hyeonsoo,Lee, Seunghun,Lee, Jaehee,Kim, Eunjong,Ahn, Heekwon 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.3
The influence of mixing on biogas production and organic material removal performance of solid state anaerobic digestion of dairy manure and sawdust bedding mixtures was evaluated using 22 L volume lab-scale digesters. After 45 days of anaerobic digestion at $37^{\circ}C$, cumulative methane yield of unmixed test unit ($73.1N{\cdot}mL/g-VS$) was almost 1.3 times of that of mixed one ($56.3N{\cdot}mL/g-VS$). The biodegradable volatile solids removal rate of unmixed test unit was 67%, which was almost 28% greater than mixed one. Our results reveal that unmixed condition is better than mixed one in terms of biogas production and organic material reduction.
Hyeonsoo Jo,Seunghun Lee,Jaehee Lee,Eunjong Kim,Heekwon Ahn 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.3
The influence of mixing on biogas production and organic material removal performance of solid state anaerobic digestion of dairy manure and sawdust bedding mixtures was evaluated using 22 L volume lab-scale digesters. After 45 days of anaerobic digestion at 37°C, cumulative methane yield of unmixed test unit (73.1 N·mL/g-VS) was almost 1.3 times of that of mixed one (56.3 N·mL/g-VS). The biodegradable volatile solids removal rate of unmixed test unit was 67%, which was almost 28% greater than mixed one. Our results reveal that unmixed condition is better than mixed one in terms of biogas production and organic material reduction.
Jo, Hyeonsoo,Lee, Seunghun,Kim, Eunjong,Ahn, Heekwon 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.4
This experiment was conducted to evaluate the effect of leachate replacement frequency on solid state anaerobic digestion (SSAD) of dairy manure using 22 L volume lab-scale digesters at mesophilic temperature ($37^{\circ}C$) in batch mode. Three different leachate replacement strategies (no replacement, once every three days, and once every nine days) were applied and three digesters per each treatment were operated for 45 days. Results showed that leachate replacement test unit every nine days resulted in 1.6 times more methane production ($53.8N{\cdot}mL\;g^{-1}{\cdot}VS$) from SSAD compared to test unit every three days ($34.0N{\cdot}mL\;g^{-1}{\cdot}VS$). No leachate replacement strategy applied group showed slightly higher methane production ($56.3N{\cdot}mL\;g^{-1}{\cdot}VS$) than every nine days replaced one. When added the methane production potential of replaced leachate itself to the methane produced from digester, leachate replacement every nine days resulted in quite similar methane production ($56.5N{\cdot}mL\;g^{-1}{\cdot}VS$) to no leachate replacement group. Even though methane production potential of replaced leachate itself added to the methane produced from digester, every three days replacement showed only $34N{\cdot}mL$ methane production per gram of volatile solids. These results suggest that farmers do not need to replace leachate during SSAD of dairy manure and sawdust mixture in order to maximize methane production. If there are any concerns with accumulation of inhibiting substances in the digester, the 9-day cycle leachate replacement is appropriate.
Hyeonsoo Jo,Seunghun Lee,Eunjong Kim,Heekwon Ahn 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.4
This experiment was conducted to evaluate the effect of leachate replacement frequency on solid state anaerobic digestion (SSAD) of dairy manure using 22 L volume lab-scale digesters at mesophilic temperature(37°C) in batch mode. Three different leachate replacement strategies (no replacement, once every three days, and once every nine days) were applied and three digesters per each treatment were operated for 45 days. Results showed that leachate replacement test unit every nine days resulted in 1.6 times more methane production (53.8 N·mL g<SUP>-1</SUP>·VS) from SSAD compared to test unit every three days (34.0 N·mL g<SUP>-1</SUP><SUP></SUP>·VS). No leachate replacement strategy applied group showed slightly higher methane production (56.3 N·mL g<SUP>-1</SUP>·VS) than every nine days replaced one. When added the methane production potential of replaced leachate itself to the methane produced from digester, leachate replacement every nine days resulted in quite similar methane production (56.5 N·mL g<SUP>-1</SUP>·VS) to no leachate replacement group. Even though methane production potential of replaced leachate itself added to the methane produced from digester, every three days replacement showed only 34 N·mL methane production per gram of volatile solids. These results suggest that farmers do not need to replace leachate during SSAD of dairy manure and sawdust mixture in order to maximize methane production. If there are any concerns with accumulation of inhibiting substances in the digester, the 9-day cycle leachate replacement is appropriate.
Fluent를 이용한 3톤급 액체로켓엔진 매니폴드 내 추진제 유동 균일성 해석
윤동호(Dongho Yun),조현택(Hyeontaek Jo),장현수(Hyeonsoo Jang),현성윤(Seongyoon Hyun),정진택(Jintaeg Jung),홍용기(Yonggi Hong),윤영빈(Yuongbin Yoon) 한국추진공학회 2023 한국추진공학회 학술대회논문집 Vol.2023 No.5
3톤급 액체로켓엔진 추진제 매니폴드에서 유동 균일성을 파악하기 위하여 Fluent를 이용해 유동해석을 수행하였다. 매니폴드 초도 설계안을 기반으로 유동 균일성 향상을 위해 연료 분배판과 추진제 배관 유입구의 형상을 변경하였고, 이러한 초도 설계안과 수정 설계안들에 대한 전산해석 결과의 유동 균일성을 비교/분석하였다. 전산해석 결과, 초도 설계안과 비교하였을 때 수정 설계안의 유동 균일성이 개선되었음을 확인하였다. Flow analysis was performed using Fluent to determine flow uniformity of 3 tonf liquid rocket engine propellant manifold. Based on the manifold initial design, the shape of the fuel distribution plate and propellant pipe inlet was changed to improve flow uniformity, and the flow uniformity of the computational analysis results for these initial and modified designs was compared/analyzed. As a result of the computational analysis, it was confirmed that the flow uniformity of the revised design was improved compared to the initial design.
Kim, Kee-Beom,Son, Hye-Ju,Choi, Sulji,Hahm, Ja Young,Jung, Hyeonsoo,Baek, Hee Jo,Kook, Hoon,Hahn, Yoonsoo,Kook, Hyun,Seo, Sang-Beom Oxford University Press 2015 Nucleic acids research Vol.43 No.7
<P>Histone H3K9 methyltransferase (HMTase) G9a-mediated transcriptional repression is a major epigenetic silencing mechanism. UHRF1 (ubiquitin-like with PHD and ring finger domains 1) binds to hemimethylated DNA and plays an essential role in the maintenance of DNA methylation. Here, we provide evidence that UHRF1 is transcriptionally downregulated by H3K9 HMTase G9a. We found that increased expression of G9a along with transcription factor YY1 specifically represses UHRF1 transcription during TPA-mediated leukemia cell differentiation. Using ChIP analysis, we found that <I>UHRF1</I> was among the transcriptionally silenced genes during leukemia cell differentiation. Using a DNA methylation profiling array, we discovered that the <I>UHRF1</I> promoter was hypomethylated in samples from leukemia patients, further supporting its overexpression and oncogenic activity. Finally, we showed that G9a regulates UHRF1-mediated H3K23 ubiquitination and proper DNA replication maintenance. Therefore, we propose that H3K9 HMTase G9a is a specific epigenetic regulator of UHRF1.</P>