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자동차 배기계용 POS AL409L 스테인리스강의 개발과 부품성능평가
김영호(Yeongho Kim),조성준(Seongjun Cho),박찬하(Chanha Park),박종환(Jonghwan Park),장민(Min Jang),박종휘(Jonghwi Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Al-coated stainless steel has been developed for the materials of automotive exhaust systems. This new materials, POS AL409L, showed excellent corrosion resistance in the condensed water environment of muffler and also in the deicing salt environments because aluminum can prevent the corrosion of stainless steel by acting as a sacrificial anode. Mechanical strength and ductility are also satisfied with the specification as exhaust materials. The corrosion resistance of automotive exhaust system with POS AL409L was superior to those of STS439 and STS409L. It showed that aluminum coating was not deteriorated in manufacturing process and the lifetime of vehicle exhaust system can be prolonged.
한국 초,중,고등학생 알레르기비염의 전국 유병률과 위험 인자에 대한 분석
김영호 ( Yeongho Kim ),서주희 ( Ju Hee Seo ),권지원 ( Ji Won Kwon ),이은 ( Eun Lee ),양송이 ( Song I Yang ),조현주 ( Hyun Ju Cho ),하미나 ( Mina Ha ),범은애 ( Eunae Burm ),이기재 ( Kee Jae Lee ),김환철 ( Hwan Cheol Kim ),임신예 ( Si 대한천식알레르기학회 2015 Allergy Asthma & Respiratory Disease Vol.3 No.4
Purpose: We investigated the prevalence and risk factors of allergic rhinitis (AR), nationwide in random children and adolescents of Korea. Methods: A modified International Study of Asthma and Allergies in Childhood (ISAAC) questionnaire survey was done in 1,820 children from elementary, middle, and high school nationwide in Korea. The subjects were selected by the stratifying sampling method by school grade and five regions. Current AR was defined as having AR symptoms during the last 12 months with a history of physician-diagnosed AR. Skin prick tests for 18 common allergens were performed. Results: The number of males was 945, and that of females was 875. The mean age of the patients was 12.61±3.40 years. The prevalence of current AR and atopic current AR were 29.0% and 18.7%, respectively. Risk factors for current AR were male (adjusted odds ratio [aOR], 1.486; 95% confidence interval [CI], 1.189.1.856), family history of paternal AR (aOR, 3.208; 95% CI, 2.460.4.182), family history of maternal AR (aOR, 3.138; 95% CI, 2.446.4.025), antibiotic use in infancy (aOR, 1.547; 95% CI, 1.228.1.949), mold exposure during infancy (aOR, 1.416; 95% CI, 1.103.1.819), mold exposure during the last 12 months (aOR, 1.285; 95% CI, 1.012.1.630), and sensitization on skin prick tests (aOR, 2.596; 95% CI, 2.055.3.279). Risk factors for atopic current AR were the same as those of current AR, whereas breast-milk feeding (aOR, 0.720; 95% CI, 0.530.0.976) was a protective factor. Sensitized allergens as risk factors for current AR were Dermatophagoides pteronyssinus, Dermatophagoides farina, ragweed, mugwort, oak, alder, birch, Japanese hop, cat, and dog. Conclusion: The prevalences of current AR and atopic current AR were 29.0% and 18.7%, respectively. Male, sex parental AR, antibiotic use in infancy, mold exposure during the last 12 months, mold exposure during infancy, and atopic sensitization were risk factors for current AR. Breast-milk feeding was a protective factor for atopic current AR. Aeroallergen sensitization was an important risk factor for AR. (Allergy Asthma Respir Dis 2015;3:272-280)
비수계 분산중합으로 제조된 환경친화성 아크릴수지/나노클레이 복합재료의 특성 연구
김영호 ( Yeongho Kim ),이민호 ( Minho Lee ),전현열 ( Hyeonyeol Jeon ),이영철 ( Young Chul Lee ),민병훈 ( Byong Hun Min ),김정호 ( Jeong Ho Kim ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.1
Eco-friendly acrylic resin/clay nanocomposites containing pristine montmorillonite (PM) or modified clays (30B and 25A) were prepared from acrylic and styrenic monomers using non-aqueous dispersion (NAD) polymerization. Effect of nanoclays on physical properties of polymerization product and resulting nanocomposites was investigated. In view of NAD particle stability, addition of nanoclay at the beginning of polymerization is proved to be good. Results of gel fraction, acid value and viscosity of the NAD product showed that nanocomposites containing clay 25A showed better physical properties than the ones with other clays. GPC results exhibit the increase in molecular weight and decrease in polydispersity index for the 25A nanocomposite. Increase in layer distance confirmed from XRD analysis showed good dispersion of 25A in the nanocomposite. Thermal and dynamic mechanical analysis showed that highest glass transition temperature and storage modulus for 25A nanocomposites. These results indicate that 25A nanoclay gives the best properties in the process of non-aqueous dispersion polymerization of acrylic resin/nanoclay nanocomposites.