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박해심,정기석,이수걸,남동호,조재웅,손지웅,김익태,김선신 대한알레르기학회 2000 천식 및 알레르기 Vol.20 No.4
Curry powder is widely used in various dishes. It is a mixture of 20-50 kinds of natural spices made from the leaves and seeds of plants. Although there have been some reports of allergy caused by inhalation of spices in western countries. While there are no reports of occupational allergy caused by spices in our country, We report a patient with rhinitis and asthma induced by exposure to spice dusts in a curry industry. A 32-year-old man developed rhinorrhea, sneezing and coughing three years prior to visiting our hospital. Since 10 years ago, he has been involved in grinding and mixing spices in a curry industry. Total peripheral eosinophil count was 400/mm and serum total IgE level was 163 IU/ml. Allergy skin-prick test showed positive responses to mugwort(3+), D. farinae(3+) and celery(3+), while serum specific IgE detected by RIA(DPC, LA, CA) shawed all negative results. Skin-prick test to four kinds of spice extracts- celery seed, fennel. cumin and coriander-showed strong positive responses. Bronchoprovocation test with celery seed extract(1: 10 v/v) showed an early asthmatic response. Specific IgE and IgG₄ antibodies to celery seed and the other three spices were detectable by ELISA. IgE-ELISA inhibition test using each spice antigen showed significant inhibitions. In conclusion, IgE-mediated mechanism may be involved in the pathogenesis of curry powder-induced bronchoconstriction in an exposed worker. Further studies will be needed to investigate the role of specific IgG₄ in pathogenesis of bronchoconstriction in curry powder- induced asthma.
VOCs Detection Based on Evanescent Wave Coupling of Dye-Coated Optical Fiber
Se-Hyuk Yeom,Byoung-Ho Kang,Chang-Taek Seo,Dong-Ic Lee,Han-Jae Shin,Sang-Chul Lim,Myung-Chan An,Sang-Won Lee,Jae-Sung Lee,Shin-Won Kang IEEE 2015 IEEE SENSORS JOURNAL Vol.15 No.5
<P>We propose a design for a highly sensitive volatile organic compounds (VOCs) sensor based on evanescent wave coupling of a side-polished optical fiber. The surface of the side-polished optical fiber coupled with a coated solvatochromic dye has charge-transfer (CT) properties. In the proposed model, the application of these optical properties and the novel solvatochromic dye helped overcome problems caused by limited sensitivity, selectivity, and dynamic range that are encountered in typical gas sensors. The different polarities of the VOCs cause changes in the effective refractive index of the sensing membrane owing to CT properties. This can lead to a change in the resonance wavelength of the side-polished optical fiber. To ascertain the effectiveness of the sensor, five VOCs dimethylamine, acetic acid, toluene, benzene, and ethanol were tested, and the enhance in sensitivity was analyzed for varying concentrations. According to the results, the proposed gas sensor showed high sensitivity and resolution.</P>
리튬 유황 전지용 PVdF 겔 고분자 전해질의 가소제에 따른 전기화학적 특성 평가
류호석,김종선,김동주,김동연,김익표,안효준,김기원,안주현,이건환,Ryu, Ho-Suk,Kim, Jong-Seon,Kim, Dong-Ju,Kim, Dong-Yeon,Kim, Ic-Pyo,Ahn, Hyo-Jun,Kim, Ki-Won,Ahn, Jou-Hyeon,Lee, Gun-Hwan 한국전기화학회 2007 한국전기화학회지 Vol.10 No.3
리튬/유황 전지에 적합한 전해질을 조사하기 위하여, 여러 종류의 글라임(glyme)계 가소제를 넣은 폴리비닐리덴플로라이드(poly(vinylidene fluoride):PVdF) 겔 고분자 전해질을 제조하여 전기화학적 특성을 실험하였다. 가소제는 에틸렌옥사이드(ethylene oxide; EO) 구조를 가지는 glyme계 유기용매 중에서, EO의 체인 길이가 다른 트리글라임(triglyme), 테트라글라임(tetraglyme), 폴리글라임(polyglyme (Mn=250, 500))의 네 종류를 사용하였다. 가소제 내의 EO의 체인 길이가 길어질수록 PVdF 겔 고분자 전해질의 이온전도도는 감소하였다. PVdF 겔 고분자 전해질의 가소제로 triglyme을 사용한 경우의 이온전도도가 $5.38{\times}10^{-4}\;S/cm$로 가장 높았으며, polyglyme(Mn=500)를 사용한 경우에는 $2.80{\times}10^{-4}\;S/cm$으로 가장 낮았다. 그러나 계면저항은 tetraglyme을 사용한 경우에 가장 낮게 나타났으며, 이 전해질을 리튬/유황 전지에 적용하였을 때 1232 mAh/g-S(이론용량의 70%)의 높은 초기 방전 용량을 나타내었다. In order to find out proper PVdF gel polymer electrolyte for Li/S battery, we investigated PVdF gel polymer electrolytes with various glyme type plasticizer such as polyglyme, tetraglyme, triglyme. The organic solvents as triglyme, tetraglyme, polyglyme (Mn = 250, 500) has different chain length of ethylene oxide(EO) in solvent of glyme system. ionic conductivity decreased as increasing chain length of EO in plasticizers. Ionic conductivity of PVdF gel electrolyte with tetraglyme, triglyme, polyglyme (Mn = 250, 500) at room temperature was $5{\times}10^{-4},\;3{\times}10^{-4},\;6{\times}10^{-5},\;3{\times}10^{-5}\;S/cm$, respectively. Li/S cell with PVdF gel polymer electrolyte using tetraglyme plasticizer had low interfacial resistance and the highest initial discharge capacity of 1232 mAh/g of active sulfur, which was about 70% utilization of theoretical value.