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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.
경화제 비율 조건에 따른 증기화 증폭 시트의 고출력 전자빔 가공을 통한 가공 성능 분석에 관한 연구
백승엽(S. Y. Baek),김현정(H. J. Kim),위은찬(E. C. Wi),고민성(M. S. Ko),최경호(K. H. Choi),강은구(E. G. Kang),김진석(J. S. Kim),강준구(J. G. Kang),김성철(S. C. Kim) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
최근, 소재, 부품, 장비 분야에 대한 기술 경쟁 및 개발에 대한 관심도가 높아짐에 따라 자동차 및 우주항공, 전기전자 등 산업 분야에서 보다 정밀하고 고 세장비의 미세 홀을 요구하는 제품 개발에 대한 기술적 요구가 증가하고 있다. 특히, 다수의 미세 홀이 요구되는 엔진 및 필터 제품에서 홀의 품질에 따라 제품의 성능에 미치는 영향이 크다. 따라서 고밀도의 에너지 빔을 통해 소재의 열적 영향을 감소시켜 가공의 정밀도를 향상시킬 수 있는 고도화된 기술을 구현할 수 있는 장비 및 공정 개발에 대한 연구들이 활발하다. 이에 본 연구에서는 고품질의 미세 홀 구현을 위해 증기화 증폭 시트의 품질을 개선시켜 고출력 전자빔 가공을 통한 성능 분석을 수행하였다. 증기화 증폭 시트를 구성하는 고분자 소재의 경화제 비율 조건에 따라 경화시간이 달라지는 것을 확인할 수 있었으며, 고출력 전자빔 가공을 통해 경화제의 비율에 따라 기화 압력으로 영향으로 인해 홀 외부로 용융물들이 분출되어 홀이 형성되는 가공성에 대해 분석하였으며, 이에 따라 다른 경화제 비율 조건과 달리 경화제 비율이 10 : 1 에서 측정된 홀의 최솟값은 168.56, 최댓값은 202.89 μm 로 발생되었으며, 안정적인 가공 결과를 통해 미세 홀 구현을 위한 적정 조건을 확보하였다.
Single-Dish Performance of KVN 21 m Radio Telescopes: Simultaneous Observations at 22 and 43 GHz
Lee, S.-S.,Byun, D.-Y.,Oh, C.S.,Han, S.-T.,Je, D.-H.,Kim, K.-T.,Wi, S.-O.,Cho, S.-H.,Sohn, B.W.,Kim, J. ASTRONOMIC SOCIETY OF THE PACIFIC 2011 Publications of the Astronomical Society of the Pa Vol.123 No.910