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액중 전기선 폭발법을 이용한 비정질 탄소가 코팅된 주석 나노분말의 제조 및 전기화학적 특성
김유영,송주석,조권구,Kim, Yoo-Young,Song, Ju-Suck,Cho, Kwon-Koo 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.4
Tin is one of the most promising anode materials for next-generation lithium-ion batteries with a high energy density. However, the commercialization of tin-based anodes is still hindered due to the large volume change (over 260%) upon lithiation/delithiation cycling. To solve the problem, many efforts have been focused on enhancing structural stability of tin particles in electrodes. In this work, we synthesize tin nano-powders with an amorphous carbon layer on the surface and surroundings of the powder by electrical wire explosion in alcohol-based liquid media at room temperature. The morphology and microstructures of the powders are characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. The electrochemical properties of the powder for use as an anode material for lithium-ion battery are evaluated by cyclic voltammetry and a galvanometric discharge-charge method. It is shown that the carbon-coated tin nano-powders prepared in hexanol media exhibit a high initial charge specific capacity of 902 mAh/g and a high capacity retention of 89% after 50 cycles.
Occupational Asthma and Rhinitis Induced by a Herbal Medicine, Wonji (Polygala tenuifolia)
김유영,전성규,김태범,강혜련,장윤석,김윤근,조상헌,민경업,박혜경 대한의학회 2005 Journal of Korean medical science Vol.20 No.1
Occupational asthma is induced by many agents, including herbal materials, that are exposed in working places. Although there are a few case reports for occupa-tional allergy induced by herbal materials, there is none for that induced by Wonji (Polygala tenuifolia). This study was conducted to evaluate clinical characteristics and immunologic mechanism of Wonji-induced asthma in a exposed-worker. A patient who complained of asthma and rhinitis symptoms, and who had worked in a herbal manufacturing factory for 8 yr, underwent a skin prick test with crude extract of Wonji under the impression of occupational asthma induced by the agent. The patient had a strong positive response to the extract on the skin prick test. Allergen bronchial challenge to the extract demonstrated a typical dual response. Serum specific IgE level to the extract was higher in the patient than in healthy controls, and ELISA inhibition test revealed complete inhibition of IgE binding with the extract, but no inhibition with Der p 2 or mugwort extracts. Six IgE binding components to the extract (10, 25, 28, 36, 50, and 90 kDa) were detected using SDS-PAGE and immunoblot analysis. These findings suggest that Polygala tenuifolia, a herbal material, can induce IgE-mediated bronchoconstriction in exposed workers.
김유영,김상기,김상국,김보애,최귀향 대한의생명과학회 2006 Biomedical Science Letters Vol.12 No.3
Cigarette smoke causes atypical structure of pulmonary and oxidative damage. Therefore, we carried out to determine if exposure to cigarette smoke alters pulmonary structure and anti-oxidant related enzyme in a animal model, when natural product extracts using by Nebulizer. The rat were divided into four groups: H2O-treated (Control), natural product (Camellia sinensis) extracts-treated (CS), natural product extracts-treated with cigarette smoke-exposed (CS+SM) and cigarette smoke-expose (SM). All groups are similar to Control group in weight, but SM group is lower than the other groups. Microscopic image of the pulmonary structure in SM group showed deleterious alterations in the morphology, but the other groups are maintained in normal structure. In anti-oxidant related enzymes, SOD (superoxide dismutase) and catalase, SM group represents the lowest enzyme activity among all groups. But G6PD (glucose-6-phosphate dehydrogenase) and LPO (lipid peroxidation) is SM group represents the highest enzyme activity among all groups. These result indicate that the natural product extracts is an efficient tissue protective substance against smoke-induced lung injury.