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Direct observation of pseudocapacitive sodium storage behavior in molybdenum dioxide anodes
Kim, Hyunchul,Son, Suhan,Choi, Woon Ih,Park, Gwi Ok,Kim, Yunok,Kim, Hyunwoo,Jeong, Mihee,Lee, Hyo Sug,Kim, Ji Man,Yoon, Won-Sub Elsevier 2018 Journal of Power Sources Vol.397 No.-
<P><B>Abstract</B></P> <P>Compared to research progress on cathode materials, progress on anode materials for sodium rechargeable batteries has been relatively slow. To bring sodium rechargeable batteries to a next level, it is necessary to explore feasible anode materials as well as understand clearly the reaction mechanism during electrochemical cycling. We herein introduce mesoporous and bulk molybdenum dioxide materials, which show excellent sodium storage performances under ether based electrolyte conditions, as anodes for sodium rechargeable batteries. Moreover, the pseudocapacitive sodium storage behavior in molybdenum dioxide anodes is proposed based on a quantitative analysis of the cyclic voltammetry responses. This result is systematically corroborated by using synchrotron radiation based analyses, X-ray photoelectron spectroscopy, scanning transmission electron microscope and <I>ab initio</I> molecular dynamics simulation. Comprehensive information on the electrochemical characterization as well as sodium storage mechanism of this transition metal oxide will provide a practical strategy to further advance anode materials for sodium rechargeable batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Introducing mesoporous and bulk MoO<SUB>2</SUB> anodes for sodium ion batteries. </LI> <LI> Excellent electrochemical performances using DME electrolyte. </LI> <LI> Pseudocapacitive sodium storage behavior is proposed based on CV measurements. </LI> <LI> Systematic validation by diverse structural analysis tools along with simulation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Case Reports : Giant Piloleiomyoma of the Forehead
( Gun Wook Kim ),( Hyun Je Park ),( Hoonsoo Kim ),( Suhan Kim ),( Hyunchang Ko ),( Byungsoo Kim ),( Moonbum Kim ) 대한피부과학회 2011 Annals of Dermatology Vol.23 No.2s
Cutaneous piloleiomyomas are benign smooth muscle tumors arising from the arrector pili muscles. Piloleiomyomas appear as firm dermal papules of skin color or with a reddish to brown surface, and are commonly located on the extremities. Histologically, these lesions are composed of interlacing bundles of smooth muscle cells in the reticular dermis. Our case presented with an unusually large nodule on the forehead that was accompanied by intermittent pain. Histological analysis was compatible with piloleiomyoma and the lesion showed haphazardly arranged bundles of smooth muscle in the dermis. We describe herein an interesting case of a giant piloleiomyoma occurring on the forehead. (Ann Dermatol 23(S2) S144~S146, 2011)
ST5 Positively Regulates Osteoclastogenesis via Src/Syk/Calcium Signaling Pathways
Kim, Min Kyung,Kim, Bongjun,Kwon, Jun-Oh,Song, Min-Kyoung,Jung, Suhan,Lee, Zang Hee,Kim, Hong-Hee Korean Society for Molecular and Cellular Biology 2019 Molecules and cells Vol.42 No.11
For physiological or pathological understanding of bone disease caused by abnormal behavior of osteoclasts (OCs), functional studies of molecules that regulate the generation and action of OCs are required. In a microarray approach, we found the suppression of tumorigenicity 5 (ST5) gene is upregulated by receptor activator of nuclear $factor-{\kappa}B$ ligand (RANKL), the OC differentiation factor. Although the roles of ST5 in cancer and ${\beta}-cells$ have been reported, the function of ST5 in bone cells has not yet been investigated. Knockdown of ST5 by siRNA reduced OC differentiation from primary precursors. Moreover, ST5 downregulation decreased expression of NFATc1, a key transcription factor for osteoclastogenesis. In contrast, overexpression of ST5 resulted in the opposite phenotype of ST5 knockdown. In immunocytochemistry experiments, the ST5 protein is colocalized with Src in RANKL-committed cells. In addition, ST5 enhanced activation of Src and Syk, a Src substrate, in response to RANKL. ST5 reduction caused a decrease in RANKL-evoked calcium oscillation and inhibited translocation of NFATc1 into the nucleus. Taken together, these findings provide the first evidence of ST5 involvement in positive regulation of osteoclastogenesis via Src/Syk/calcium signaling.
Assessment of energy saving effects in membrane-based seawater desalination
Kim, Minseok,Jeon, Jongmin,Ryu, Hyunwook,Lee, Sangho,Kim, Suhan Balaban Publishers 2017 Desalination and Water Treatment Vol. No.
<P>In reverse osmosis (RO) process for seawater desalination, the most important issue is the energy consumption. Intensive efforts have been contributed to freshwater production from seawater at low energy so far. This work analyzes the amount of energy consumption for various energy saving methods proposed by literatures using five commercial RO simulation programs (e.g., CSMPRO Ver 5.0, IMS-Design - 2016, ROSA 9.0, LG Chem NanoH(2)O, and Toray DS2). The RO energy consumption can be saved by: (1) adopting high flux RO membranes (0.23-0.67 kWh/m(3)), (2) increasing feed water temperature (0.01-0.03 kWh/m(3)/degrees C), (3) increasing RO train size (1.17-1.35 kWh/m(3) for sizing up from 1,000 to 10,000 m(3)/d), (4) increasing RO membrane area (0.01-0.02 kWh/m(3)/% increase), and (5) decreasing feed concentration (0.02 kWh/m(3)/% decrease). If fouling occurs, the RO energy consumption increases by 0.05 kWh/m(3)/bar. Comparing the positive effect of energy saving methods and the negative effect of fouling, one can set an optimal strategy for energy saving in RO-based seawater desalination according to a specific situation.</P>
Practical limit of energy production from seawater by full-scale pressure retarded osmosis
Kim, Minseok,Kim, Suhan Elsevier 2018 ENERGY Vol.158 No.-
<P><B>Abstract</B></P> <P>Pressure retarded osmosis (PRO) produces energy using the salinity gradient between two solutions (draw solution (DS) and feed solution (FS)). Net energy production (NEP) of PRO was analyzed using a module-scale model developed in this work. The NEP analysis determines net energy from PRO by the difference between energy production by turbine and energy consumption by DS, FS, and booster pumps. Especially, the effects of system capacity and membrane fouling on NEP are investigated using a module-scale modeling approach for the first time. The maximum net specific energy (NSE) per PRO system capacity (sum of DS and FS flow rates) is close to 0.1 kWh/m<SUP>3</SUP> without pretreatments. The maximum NSE decreases at smaller system capacities, and it becomes around 0.03 kWh/m<SUP>3</SUP> from a PRO system with 520 m<SUP>3</SUP>/d as capacity. NSE from seawater decreases in the presence of membrane fouling, but it remains positive under the severe fouling condition where water flux decreases by 32% if the system capacity is large enough to have efficient pumps and turbines.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NEP of PRO was analyzed with consideration of effects of system capacity and fouling. </LI> <LI> The maximum available NSE from clean seawater is close to 0.1 kWh/m<SUP>3</SUP>. </LI> <LI> NSE from PRO decreases down to 0.03 kWh/m<SUP>3</SUP> as system size decreases. </LI> <LI> Net energy could be extracted from PRO using seawater in the presence of fouling. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>