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- 저자 : Lee Kyounghee (검색결과 106 건)
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Lee, Jin Yong,Shin, Kyounghee,Seo, Hyemin,Jun, Hwiseok,Hirai, Alex Naoto Shishido,Lee, Jin Won,Nam, Yoon Sung,Kim, Jin Woong Elsevier 2018 Journal of industrial and engineering chemistry Vol.58 No.-
<P><B>Abstract</B></P> <P>This study reports a robust and straightforward approach to fabricate polymer microcapsules with a silica reinforced polyelectrolyte thin shell layer. We showed that the layer-by-layer deposition of silica nanoparticles with polyelectrolytes remarkably reinforced the shell layer, which was experimentally demonstrated by focused ion beam analysis. Moreover, we demonstrated that the molecular degradation of a model antioxidant encapsulated in our capsule system was effectively hindered during long-term storage. This indicates that the presence of the silica nanoparticles-reinforced polyelectrolyte shell layer displayed enhanced cargo retention against leakage of the antioxidant as well as oxygen attack from the surroundings.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Polymer microcapsules with a silica reinforced polyelectrolyte shell were produced. </LI> <LI> The LbL deposition of silica nanoparticles remarkably reinforced the shell layer. </LI> <LI> A model antioxidant was effectively stabilized during long-term storage. </LI> <LI> Our capsules enhanced cargo retention against antioxidant leakage and oxygen attack. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Lee, Hee Suk,Lee, Jeongyup,Yoon, Byengsuk,Yim, Youjin,Choi, Ilhwan,Cho, Hyukjin,Lee, Songhee,Baik, Kyounghee,Park, Ju Hyeon,Huh, Yu Jeong IWA Publishing 2013 WATER SCIENCE AND TECHNOLOGY -WATER SUPPLY- Vol.13 No.5
<P>Due to the tragic disaster that happened in Japan and crippled the Fukushima nuclear power plant, serious concerns have been raised regarding the contamination of drinking water as a result of the radioactive materials that were released. Even though the quantities of radioactive material in rain were relatively low, people were concerned about the drinking water. Therefore, there is a need to know the removal efficiency of the unit process of water treatment and to prepare a safety plan to protect the public's health from radioactive materials. In this study, the laboratory scale removal rates were estimated for the coagulation/flocculation, adsorption, and ion exchange processes. The reference standard materials which are stable elements, Cesium-133 (Cs-133) and Iodine-127 (I-127), were used for the typical and advanced water treatment processes at the laboratory scale. For the coagulation/flocculation process, three major coagulants were assessed for this process. However, the removal rates of this process were low. For the adsorption process, powdered activated carbon and zeolites were investigated. The powdered activated carbon showed insignificant removal rates for both reference materials. However, synthetic zeolite was an effective process for Cs-133, and the ion exchange method showed high removal rates for both Cs-133 and I-127.</P>
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Lee, Kyounghee,Park, Ok-Sun,Seo, Pil Joon AAAS 2017 Science signaling Vol.10 No.507
<P><B>Epigenetic control of dedifferentiation</B></P><P>Some plant cells can dedifferentiate to form a mass of pluripotent cells called callus. This not only occurs at wound sites but can also be induced by specific laboratory culture conditions. Lee <I>et al</I>. found that the histone lysine methyltransferase ATXR2 promoted cellular dedifferentiation during callus formation in <I>Arabidopsis thaliana</I> by stimulating the expression of <I>LBD</I> genes, which encode transcription factors that promote cell cycle progression. ATXR2 localized to <I>LBD</I> promoters, stimulated the accumulation of lysine-methylated histones at these promoters, and was recruited to the promoters by the transcription factors ARF7 and ARF19. Epigenetic regulation is a key mechanism controlling cell potency and differentiation in both plants and animals, and these findings contribute to understanding the remarkable developmental plasticity of plant cells.</P><P>Cellular dedifferentiation, the transition of differentiated somatic cells to pluripotent stem cells, ensures developmental plasticity and contributes to wound healing in plants. Wounding induces cells to form a mass of unorganized pluripotent cells called callus at the wound site. Explanted cells can also form callus tissues in vitro. Reversible cellular differentiation-dedifferentiation processes in higher eukaryotes are controlled mainly by chromatin modifications. We demonstrate that ARABIDOPSIS TRITHORAX-RELATED 2 (ATXR2), a histone lysine methyltransferase that promotes the accumulation of histone H3 proteins that are trimethylated on lysine 36 (H3K36me3) during callus formation, promotes early stages of cellular dedifferentiation through activation of <I>LATERAL ORGAN BOUNDARIES DOMAIN</I> (<I>LBD</I>) genes. The <I>LBD</I> genes of <I>Arabidopsis thaliana</I> are activated during cellular dedifferentiation to enhance the formation of callus. Leaf explants from <I>Arabidopsis atxr2</I> mutants exhibited a reduced ability to form callus and a substantial reduction in <I>LBD</I> gene expression. ATXR2 bound to the promoters of <I>LBD</I> genes and was required for the deposition of H3K36me3 at these promoters. ATXR2 was recruited to <I>LBD</I> promoters by the transcription factors AUXIN RESPONSE FACTOR 7 (ARF7) and ARF19. Leaf explants from <I>arf7-1arf19-2</I> double mutants were defective in callus formation and showed reduced H3K36me3 accumulation at <I>LBD</I> promoters. Genetic analysis provided further support that ARF7 and ARF19 were required for the ability of ATXR2 to promote the expression of <I>LBD</I> genes. These observations indicate that the ATXR2-ARF-LBD axis is key for the epigenetic regulation of callus formation in <I>Arabidopsis</I>.</P>
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Lee, Kyounghee,Lee, Hong Gil,Yoon, Seongmun,Kim, Hyun Uk,Seo, Pil Joon American Society of Plant Physiologists 2015 PLANT PHYSIOLOGY - Vol.168 No.2
<P>Seed germination is a key developmental transition that initiates the plant life cycle. The timing of germination is determined by the coordinated action of two phytohormones, gibberellin and abscisic acid (ABA). In particular, ABA plays a key role in integrating environmental information and inhibiting the germination process. The utilization of embryonic lipid reserves contributes to seed germination by acting as an energy source, and ABA suppresses lipid degradation to modulate the germination process. Here, we report that the ABA-responsive R2R3-type MYB transcription factor MYB96, which is highly expressed in embryo, regulates seed germination by controlling the expression of abscisic acid-insensitive4 (ABI4) in Arabidopsis (Arabidopsis thaliana). In the presence of ABA, germination was accelerated in MYB96-deficient myb96-1 seeds, whereas the process was significantly delayed in MYB96-overexpressing activation-tagging myb96-ox seeds. Consistently, myb96-1 seeds degraded a larger extent of lipid reserves even in the presence of ABA, while reduced lipid mobilization was observed in myb96-ox seeds. MYB96 directly regulates ABI4, which acts as a repressor of lipid breakdown, to define its spatial and temporal expression. Genetic analysis further demonstrated that ABI4 is epistatic to MYB96 in the control of seed germination. Taken together, the MYB96-ABI4 module regulates lipid mobilization specifically in the embryo to ensure proper seed germination under suboptimal conditions.</P>
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Kyounghee Chu,Doo-Hee Lee,Ji Yoon Kim 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
Given the pervasive use of brand personification by marketers, it is surprising that there has been extremely limited research directly examining the effects of brand personification. In this article, we attempt to fill this gap in part by exploring how personified brand, in contrast to an objectified brand, might affect consumers’ response. Also, previous research have studied mainly on the visual or combined (visual-verbal) brand personification without differentiating the two types of brand personification. Therefore, this study tries to focus on the verbal brand personification which has not been studied extensively. And there are two types of verbal brand personification: external and internal image. So this study validates the effect of internal (kind) or external (looking good) verbal brand personification separately in the series of two experiments. Study 1 tests the effect of internal verbal brand personification on the consumer evaluation using product brand. Specifically, we test the moderating effect of brand knowledge between verbal brand personification and consumer evaluation and explore the underlying mechanisms (brand intimacy, psychological discomfort) about how the interaction effect of personification level and brand knowledge occurs. Study 2 tests the effect of external verbal brand personification on the consumer evaluation using service brand. Specifically, we test the effect of need-for-cognition on attitude towards personified brand ad and additionally explore the underlying mechanisms (perceived novelty, cognitive resistance) about how need-for-cognition influences. This research could provide useful guidelines for the marketers to utilize personification method when planning the head copy or slogan for advertisement. Therefore, marketers are better able to make an effective brand personification strategy through understanding the boundary conditions and mechanisms about the impact of brand personification based on the findings of this study.
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A Distributed Mobility Management Framework for 5G Converged Networks
Kyounghee Lee,No-Ik Park 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.11
A mobility management issue is surfacing again as it is expected that mobility requirements will be very essential and vary with application scenarios in the future 5G networks. An important research direction on this area is to design a flat and distributed control architecture to achieve scalability enough to be applied into the wide-scale real networks. In this paper, we propose a distributed mobility management framework for evolving networks toward 5G. The main idea is to separate location management from data traffic control during handling a node's handover. By being divided from location update to be propagated throughout whole network, handover control process can be localized and accelerated in a distributed manner. To apply different control operations according to handover types is another important feature of our approach. Experimental results from our simulation study show that the proposed framework considerably outperforms a well-known MM protocol, Proxy Mobile IPv6, in the aspects of handover latency, packet loss and dispersion of control overhead.
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