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Wi, S.,Kim, J.,Nam, S.,Kang, J.,Lee, S.,Woo, H.,Lee, M.,Sonu, C.H.,Moon, T.,Park, B. Elsevier 2014 CURRENT APPLIED PHYSICS Vol.14 No.5
The reduced graphene oxide (RGO)/carbon double-coated LiMn<SUB>0.9</SUB>Mg<SUB>0.1</SUB>PO<SUB>4</SUB> (LMP) nanoplates are introduced as a cathode material for Li-ion batteries with excellent rate capability. The double coating of RGO and carbon simultaneously brings the unique advantages of conformal carbon layer on each particle surface, and soft RGO sheets connecting the nanoplates to each other, thereby provides easy conduction pathways for the whole LMP aggregates. In particular, the simple self-assembly process driven by the electrostatic interactions enables conducting RGO sheets effectively to wrap the carbon-coated LMP, establishing three-dimensional RGO network. The RGO/C/LMP nanocomposites exhibit remarkably enhanced rate capability compared to the only C- or RGO-coated LMP, which is well explained by the reduced charge-transfer resistance achieved from electrochemical impedance spectroscopy.
Kang, H.J.,Lee, G.,Kim, J.Y.,Lee, S.H.,Wi, H.C.,Hwang, P.G.,Chung, D.H.,Kim, Y.T. Springer International 2005 European journal of cardio-thoracic surgery Vol.28 No.1
Objective: Unlike cardiac or renal xenotransplants, the depletion of complement using cobra venom factor (CVF) does not improve pulmonary xenograft survival. Several cases suggest that the swine von Willebrand factor (vWF) may play a major role in presenting a different pathogenesis of pulmonary xenograft dysfunction from other organs. To evaluate the role of vWF and the complement system in mediating hyperacute vascular injury of pulmonary xenografts and elucidate pathogenesis of the injury, we performed swine-to-canine orthotropic single lung xenotransplantation after pre-treatment of 1-deamino-8-d-arginine vasopressin (DDAVP) and CVF. Methods: We set up three groups for lung xenotransplantation: group I served as the control group; group II, recipients pre-treated with CVF; group III, donors pre-treated with DDAVP (9mg/kg, 3 days)/recipients pre-treated with CVF (60u/kg). Hemodynamic data, coagulation and complement system parameters, and grafted lung pathologies were examined serially for 3h after transplantation. Results: DDAVP infusion reduced the vWF content in swine lung tissue in vivo (7.7+/-2.4AU/mg vs 16.0+/-5.6AU/mg, P<0.0001). Infusion of CVF 24h prior to transplantation effectively depleted the recipient's serum C3 and complement hemolytic activity below the detectable range. Regardless of the use of CVF, both groups I and II transplanted with unmodified grafts showed an immediate drop in leukocytes and platelet counts after transplantation. However, in group III, in recipients transplanted with DDAVP pre-treated swine lung, the platelet count did not decrease after transplantation (P=0.0295). The decrease of plasma antithrombin and fibrinogen tended to be attenuated in group III. Light microscopic examination revealed extensive vascular thromboses in both capillary and larger vessels, as well as early pulmonary parenchymal damage in groups I and II, but were rarely observed in group III. Conclusions: Complement inhibition alone was not enough to alleviate intravascular thrombosis, the main pathology in pulmonary xenotransplantation. Pre-infusion of DDAVP to the donor animal was effective in preventing platelet sequestration and attenuated intravascular thrombosis. It is suggested that the strategies targeting vWF would be promising for successful pulmonary xenotransplantation. tation.
Wi, S.,Kim, J.,Lee, S.,Kang, J.,Kim, K.H.,Park, K.,Kim, K.,Nam, S.,Kim, C.,Park, B. Pergamon Press 2016 ELECTROCHIMICA ACTA Vol.216 No.-
The micron-sized LiMn<SUB>0.8</SUB>Fe<SUB>0.2</SUB>PO<SUB>4</SUB> (LMFP) mesocrystals with high volumetric density were successfully synthesized via a solvothermal method. The LMFP mesocrystals, composed of ~30-nm-sized nanocrystallites, exhibit a high tap density of ~1.2g/cm<SUP>3</SUP>. The synthesis of such nano-sized crystals was rendered by ascorbic acid which serves as surface-energy modifier. Interestingly, the ascorbic acid also directed the primary nanocrystals to anisotropic aggregations, and the growth mechanisms were rationally identified by TEM and x-ray diffraction. For reversible Li insertion/extraction, the interconnected particles within the mesocrystals were coated by conductive carbon, and the enhancement of the electrochemical properties (i.e. high specific capacity and good rate capability) was assessed by galvanostatic cycling. We believe that this work provides one of the routes to design electrochemically-favorable meso/nano-structures, which is of great potential for improving the battery performance by tuning the morphology of particles at the multi-length scale.
Optics design of the divertor infrared television of KSTAR.
Oh, S,Lee, K,Lee, H H,Wi, H M,Kim, Y S,Kang, C S American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>The divertor Infrared television (IR TV) system for monitoring the temperature of a divertor and localized hot spots will be installed on the upper port of the N-port in the Korea Superconducting Tokamak Advanced Research (KSTAR). The cassette of KSTAR makes a periscope inevitable for the divertor IR TV. In this article, 4 design concepts for the periscope were examined, and the design based on Keplerian was shown to have better stabilities in alignment and the vibration. The final optics design based on an f-theta lens, Keplerian, and telecentric lens was derived.</P>