• Clinical and Experimental Pediatrics
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• 제55권5호
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• pp.153-158
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• 2012

Food allergy is an important public health problem affecting 5% of infants and children in Korea. Food allergy is defined as an immune response triggered by food proteins. Food allergy is highly associated with atopic dermatitis and is one of the most common triggers of potentially fatal anaphylaxis in the community. Sensitization to food allergens can occur in the gastrointestinal tract (class 1 food allergy) or as a consequence of cross reactivity to structurally homologous inhalant allergens (class 2 food allergy). Allergenicity of food is largely determined by structural aspects, including cross-reactivity and reduced or enhanced allergenicity with cooking that convey allergenic characteristics to food. Management of food allergy currently focuses on dietary avoidance of the offending foods, prompt recognition and treatment of allergic reactions, and nutritional support. This review includes definitions and examines the prevalence and management of food allergies and the characteristics of food allergens.

• Steel and Composite Structures
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• 제11권1호
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• pp.21-38
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• 2011

This study examines the influence of curved, steel, I-girder bridge configuration on girder end reactions and cross frame member forces during seismic events. Simply-supported bridge finite element models were created and examined under seismic events mimicking what could be experienced in AASHTO Seismic Zone 2. Bridges were analyzed using practical ranges of: radius of curvature; girder and cross frame spacings; and lateral bracing configuration. Results from the study indicated that: (1) radius of curvature had the greatest influence on seismic response; (2) interior (lowest radius) girder reactions were heavily influenced by parameter variations and, in certain instances, uplift at their bearings could be a concern; (3) vertical excitation more heavily influenced bearing and cross frame seismic response; and (4) lateral bracing helped reduce seismic effects but using bracing along the entire span did not provide additional benefit over placing bracing only in bays adjacent to the supports.

• Nuclear Engineering and Technology
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• 제7권2호
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• pp.119-126
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• 1975

핵임계 사고시에 방출되는 즉발중성자 스펙트럼을 두개의 스펙트럼 매개변수를 갖는 일반화된 Cranberg 식으로 표시할 수 있다고 가정한 다음, 이들 매개변수를 변화시키면서 몇개의 발단 방사화검출체에 대한 평균핵반응단면적의 변화를 고속전자계산기로 계산하였다. 평균핵반응 단면적은 스펙트럼 변화에 따라 민감하게 변화하는데 발단 방사화 에너지가 높을수록 그 변화정도가 심한것 같았다.

• Clinical and Experimental Pediatrics
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• 제52권4호
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• pp.499-503
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• 2009

요오드성 조영제는 즉각적인 부작용과 지연성 부작용을 일으킬 수 있다. 저자들은 컴퓨터 단층 촬영을 위해 요오드성 조영제인 iopromide ($Ultravist^{(R)}$)를 사용하고 2일 뒤에 전신에 반점 구진성 반점과 발열이 반복적으로 발생한 환아를 경험하였다. 이 환아에서 피부단자시험, 피내반응검사, 첩포검사를 포함한 피부반응검사를 시행하여 $Ultravist^{(R)}$에 지연성 반응임을 확인하고 다른 조영제인 ioversol ($Optiray^{(R)}$), iohexol ($Iobrix^{(R)}$), iobitridol ($Xenetix^{(R)}$) 에도 교차반응이 있음을 확인하였기에 보고하는 바이다.

• Bulletin of the Korean Chemical Society
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• 제30권3호
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• pp.726-728
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• 2009

• Bulletin of the Korean Chemical Society
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• 제23권5호
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• pp.663-664
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• 2002

• Bulletin of the Korean Chemical Society
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• 제8권5호
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• pp.426-427
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• 1987

• Bulletin of the Korean Chemical Society
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• 제17권11호
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• pp.1087-1090
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• 1996

• Bulletin of the Korean Chemical Society
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• 제35권7호
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• pp.1979-1984
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• 2014

We have developed an efficient method to generate highly active Pd and PdO nanoparticles (NPs) dispersed on graphene and graphene oxide (GO) by an impregnation method combined with thermal treatments in $H_2$ and $O_2$ gas flows, respectively. The Pd NPs supported on graphene (Pd/G) and the PdO NPs supported on GO (PdO/GO) demonstrated excellent carbon-carbon cross-coupling reactions under a solvent-free, environmentally-friendly condition. The morphological and chemical structures of PdO/GO and Pd/G were fully characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). We found that the remarkable reactivity of the Pd/G and PdO/GO catalysts toward the cross-coupling reaction is attributed to the high degree of dispersion of the Pd and PdO NPs while the oxidative states of Pd and the oxygen functionalities of graphene oxide are not critical for their catalytic performance.

• Bulletin of the Korean Chemical Society
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• 제34권5호
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• pp.1477-1480
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• 2013

The Suzuki cross-coupling reactions proceeded in excellent yields when it was catalyzed by magnetically recyclable nanocatalyst. This nanocatalyst provided very high catalytic activity with low loading level (1 mol %), because the palladium nanoparticles were so small in size (~2 nm) and located on the surface of the nanocomposite. It was also easily recovered from the reaction mixture using a magnet and reused for six consecutive cycles.