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RISS 인기검색어
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- 저자 : Jiwan Hong (검색결과 50 건)
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홍지완 ( Jiwan Hong ),조혜준 ( Hyejun Jo ),운노타쯔야 ( Tatsuya Unno ) 한국응용생명화학회 2019 Journal of Applied Biological Chemistry (J. Appl. Vol.62 No.4
In this study, we investigated the effects of fasting on gut microbiota of mice fed normal (CTL) or high-fat diets (HF). Mice were raised for 16 weeks and fasted for a day at the end of the experiment. Fecal samples were collected one day before and after fasting, which were analyzed using MiSeq. Our results showed that the species richness and evenness were decreased in fasted HF group, whereas no difference was observed for CTL groups. Moreover, HF fed mice gut microbiota showed different microbial communities after fasting, while CTL groups did not show microbiota shifts. Differential abundance analysis showed that fasting CTL group mice increased and decreased one operational taxonomic unit (OTU) in S24_7 and one OTU in Ruminococcaceae, respectively. On the other hand, fasting HF group mice decreased 10 OTUs and increased 3 OTUs most of which were classified to Ruminococcaceae. Our results suggest that fasting mice may affect the abundance of Ruminococcaceae species and effects of fasting seem to be more obvious for HF-fed mice compared to those of mice fed CTL-diet.
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Hong, Min-Hee,Choi, Haryeong,Shim, Dong Il,Cho, Hyung Hee,Kim, Jiwan,Park, Hyung-Ho Elsevier 2018 SOLID STATE SCIENCES Vol.82 No.-
<P><B>Abstract</B></P> <P>In this study, effects of induced stress and strain on the thermoelectric properties of mesoporous ZnO thin films with various Al doping concentrations were investigated. With Al doping in ZnO structure, the hexagonal wurtzite structure of ZnO was distorted owing to an ionic size difference between Al and Zn. With an increase in Al concentration to 4 at%, thermal conductivity unexpectedly decreased from 1.70 to 1.24 W/mK owing to an increase in the tensile strain, and electrical conductivity increased from 4 S/cm to 15 S/cm owing to an increase in the carrier concentration. Based on this study, the relationship between the induced strain owing to lattice distortion and thermoelectric properties was investigated. Thus, 4 at% Al-doped mesoporous ZnO demonstrated best enhanced thermoelectric properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Al-doped mesoporous ZnO film synthesized by evaporation-induced self-assembly process. </LI> <LI> Crystal structure of Al-doped ZnO was distorted owing to difference ionic radii between Al<SUP>3+</SUP> and Zn<SUP>2+</SUP>. </LI> <LI> Al-doping induced stress/strain in mesoporous ZnO structure was calculated using Williamson-Hall analysis. </LI> <LI> Correlation between stress/strain and thermoelectric properties were analyzed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Jiwan Seo,Jae Seung Kim,Kyu Hong Kim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
JP-10 is an important fuel in the petroleum and aviation industries because it has the highest specificimpulse among kerosene-type jet fuels. Thus, a high predictive performance for the thermodynamicproperties of JP-10 is necessary for high-fidelity computational analysis. To accurately and efficiently predictthe thermodynamic properties of JP-10, the extended Redlich-Kwong-Peng-Robinson (eRK-PR) equationof state (EoS) is developed. A new d parameter constraint condition and correlation between theexperimental critical compressibility factor (Zexpc ) and the critical compressibility factor of the EoS(ZEoSc ) are proposed to extend the range of the available Zexpc in the Redlich-Kwong-Peng-Robinson EoS. Subsequently, the predictive performance of the eRK-PR EoS is evaluated on eight test compounds andJP-10. The predicted thermodynamic properties of nine pure compounds are compared with thoseobtained using a variety of EoSs and the National Institute of Standards and Technology data. The resultsconfirm that the eRK-PR EoS predicts the thermodynamic properties of JP-10 more accurately than theother EoSs.
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