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Chemical-Looping Combustion을 위한 금속산화물 매체들의 산화 환원 반응특성
이진배,송영욱,박주식,최상일,김영호,양현수 忠南大學校 産業技術硏究所 2003 산업기술연구논문집 Vol.18 No.2
Chemical-looping combustion has been focused as a very promising combustion technology from the viewpoint of high energy efficiency, easy separation of CO_(2) and no formation of NO_(x). The key of this combustion technology is to develop oxygen carrier mediums with high oxygen capacity, and high machanical and thermal stability. In this study, various kinds of mediums were prepared by the combination of active metal oxides, such as NiO, CoO, Fe_(2)O_(3) or NiO-Fe_(2)O_(3), with YSZ(yttria stabilized zirconia) as a binder. The redox reactions on the mediums were also carried out by using the thermogravimetric reactor. The redox reaction rates on a NiO/YSZ medium were found to be most superior in comparison with those of other mediums. In addition, durability of the medium was also found to be appropriate for UC. For the purpose of high redox reaction rates, the optimum reaction temperatures of reduction and oxidation on a NiO/YSZ medium were observed as 600℃ and l000℃, respectively.
Evaluation of Disaster Response System Using Agent-Based Model With Geospatial and Medical Details
Bae, Jang Won,Shin, Kyohong,Lee, Hyun-Rok,Lee, Hyun Jin,Lee, Taesik,Kim, Chu Hyun,Cha, Won-Chul,Kim, Gi Woon,Moon, Il-Chul IEEE 2018 IEEE transactions on systems, man, and cybernetics Vol.48 No.9
<P>Many disasters have occurred around the world and have caused sizable damage. A disaster, called a mass casualty incident (MCI), generates a large number of casualties that overwhelm the capacity of local medical resources, and the disaster responses to the MCI requires many interactions among the disaster responders. To evaluate the efficiency of the disaster responses against MCIs, this paper proposes an agent-based model describing the cooperations among the responders during the overall process in the disaster responses from transporting patients to their definitive care. In particular, the proposed model includes geospatial details, such as the road network and the location of hospitals around the disaster scene, and medical information, such as the distribution of medical resources and transporting units, in the region of interest to discover the key factors of the disaster response system that customized to the target region. The case study in this paper presents that the proposed approach was applied to describe a disaster response system and illustrates how the additional details are utilized to analyze the disaster response system. We expect that the proposed method can provide comprehensive insights to a disaster response system of interest, and it can be used as groundwork for improving the disaster response system.</P>
A Novel Human PTH Analog [Cys25]hPTH(1—34) Restores Bone Mass in Ovariectomized Mice
Bae, Chu Hyun,Kang, Myeongmo,Park, Clara Yongjoo,Park, Bo Mi,Zhang, Dongdong,Nam, Hee Jin,Yang, Yu-Mi,Shin, Dong Min,Choi, Je-Yong,Lim, Sung-Kil ENDOCRINE SOCIETY 2016 The Journal of clinical endocrinology & metabolism Vol.101 No.10
<P>Conclusion: The high bone mass phenotype observed in this patient with hypoparathyrodism caused by a Cys mutation at the 25th residue of hPTH(1-84) may have arisen from both direct and indirect effects exerted by the mutant PTH itself on bone.</P>
Chu Hyun Bae,김지수,남우,김현지,김주연,남보라,박수동,이정열,심재헌 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.6
Ginseng (the root of Panax ginseng Meyer) has been reported to have many biologic therapeutic effects, including anti-inflammatory properties, and ginsenosides are considered as one of the factors responsible for these therapeutic effects. To improve their therapeutic action, probiotic bacteria are used to ferment and chemically transform ginsenosides in red ginseng (RG). In this study, we aimed to investigate the beneficial effects of RG fermented by probiotic bacteria (FRG) against ovalbumin (OVA)-induced allergic rhinitis in a mouse model. We induced the mouse model via OVA inhalation; experimental results revealed increased immunoglobulin E (IgE) and interleukin (IL)-4 levels, leading to Th2-type cytokine response. The mice with induced allergy were then orally administered RG and FRG over 2 weeks, as a result of which, IL-4 and IgE levels in bronchoalveolar lavage fluid, nasal fluid, and serum were found to be ameliorated more effectively by FRG than by RG, suggesting that FRG has better immune regulatory effects than RG. FRG also downregulated immune cell levels, such as those of eosinophils and basophils, and significantly decreased the thickness of OVA-induced respiratory epithelium compared to RG. Collectively, the results showed that FRG treatment alleviates inflammation, thereby extending a protective effect to mice with OVA-induced inflammatory allergic rhinitis.
Bae, Jung Jun,Jeong, Hye Yun,Han, Gang Hee,Kim, Jaesu,Kim, Hyun,Kim, Min Su,Moon, Byoung Hee,Lim, Seong Chu,Lee, Young Hee The Royal Society of Chemistry 2017 Nanoscale Vol.9 No.7
<P>The in-plane thermal conductivities of suspended monolayer, bilayer, and multilayer MoS2 films were measured in vacuum by using non-invasive Raman spectroscopy. The samples were prepared by chemical vapor deposition (CVD) and transferred onto preformed cavities on a Au-coated SiO2/Si substrate. The measured thermal conductivity (13.3 ± 1.4 W m<SUP>−1</SUP> K<SUP>−1</SUP>) of the suspended monolayer MoS2 was below the previously reported value of 34.5 ± 4 W m<SUP>−1</SUP> K<SUP>−1</SUP>. We demonstrate that this discrepancy arises from the experimental conditions that differ from vacuum conditions and small absorbance. The measured in-plane thermal conductivity of the suspended MoS2 films increased in proportion to the number of layers, reaching 43.4 ± 9.1 W m<SUP>−1</SUP> K<SUP>−1</SUP> for the multilayer MoS2, which explicitly follows the Fuchs-Sondheimer suppression function. The increase in the thermal conductivity with the number of MoS2 layers is explained by the reduced phonon boundary scattering. We also observe that the Fuchs-Sondheimer model works for the thickness-dependent thermal conductivity of MoS2 down to 10 nm in thickness at room temperature, yielding a phonon mean free path of 17 nm for bulk.</P>
Sensitive photo-thermal response of graphene oxide for mid-infrared detection.
Bae, Jung Jun,Yoon, Jung Hyun,Jeong, Sooyeon,Moon, Byoung Hee,Han, Joong Tark,Jeong, Hee Jin,Lee, Geon-Woong,Hwang, Ha Ryong,Lee, Young Hee,Jeong, Seung Yol,Lim, Seong Chu RSC Pub 2015 Nanoscale Vol.7 No.38
<P>This study characterizes the effects of incident infrared (IR) radiation on the electrical conductivity of graphene oxide (GO) and examines its potential for mid-IR detection. Analysis of the mildly reduced GO (m-GO) transport mechanism near room temperature reveals variable range hopping (VRH) for the conduction of electrons. This VRH behavior causes the m-GO resistance to exhibit a strong temperature dependence, with a large negative temperature coefficient of resistance of approximately -2 to -4% K(-1). In addition to this hopping transport, the presence of various oxygen-related functional groups within GO enhances the absorption of IR radiation significantly. These two GO material properties are synergically coupled and provoke a remarkable photothermal effect within this material; specifically, a large resistance drop is exhibited by m-GO in response to the increase in temperature caused by the IR absorption. The m-GO bolometer effect identified in this study is different from that exhibited in vanadium oxides, which require added gold-black films that function as IR absorbers owing to their limited IR absorption capability.</P>
Cho, Hyun-Jai,Lee, Choon-Soo,Kwon, Yoo-Wook,Paek, Jae Seung,Lee, Sun-Hee,Hur, Jin,Lee, Eun Ju,Roh, Tae-Young,Chu, In-Sun,Leem, Sun-Hee,Kim, Youngsoo,Kang, Hyun-Jae,Park, Young-Bae,Kim, Hyo-Soo American Society of Hematology 2010 Blood Vol.116 No.3
<B>Abstract</B><P>The concept of reprogramming of somatic cells has opened a new era in regenerative medicine. Transduction of defined factors has successfully achieved pluripotency. However, during the generation process of induced pluripotent stem (iPS) cells, genetic manipulation of certain factors may cause tumorigenicity, which limits further application. We report that that a single transfer of embryonic stem (ES) cell-derived proteins into primarily cultured adult mouse fibroblasts, rather than repeated transfer or prolonged exposure to materials, can achieve full reprogramming up to the pluripotent state without the forced expression of ectopic transgenes. During the process, gene expression and epigenetic status were converted from somatic to ES-equivalent status. We verified that protein-based reprogramming was neither by the contamination of protein donor ES cell nor by DNA/RNA from donor ES cell. Protein-iPS cells were biologically and functionally very similar to ES cells and differentiated into 3 germ layers in vitro. Furthermore, protein-iPS cells possessed in vivo differentiation (well-differentiated teratoma formation) and development (chimeric mice generation and a tetraploid blastocyst complementation) potentials. Our results provide an alternative and safe strategy for the reprogramming of somatic cells that can be used to facilitate pluripotent stem cell-based cell therapy.</P>