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부산지역 접촉성피부염 의심 환자에서 첩포검사 결과 분석
김광석 ( Gwangseok Kim ),박찬선 ( Chan Sun Park ),오지현 ( Ji Hyun Oh ),김희규 ( Hee-kyoo Kim ),최길순 ( Gil-soon Choi ) 대한천식알레르기학회 2024 Allergy Asthma & Respiratory Disease Vol.12 No.2
Purpose: Contact dermatitis (CD) is a common skin disease caused by various allergens that can be identified by patch test (PT). Despite the analysis of PT outcomes in various regions of Korea, no specific investigation has targeted the Busan area. We aimed to analyze PT results using Chemotechnique in patients suspected of CD in Busan. Methods: We reviewed medical records of 273 patients who underwent PT between 2019 and 2020 at two university hospitals in Busan. PT results were interpreted according to the International Contact Dermatitis Research Group criteria. Results: Among the patients, 86.4% exhibited positive reactions to at least one allergen. Those with positive outcomes displayed a higher comorbidity rate of chronic urticaria but a lower rate of atopic dermatitis. Moreover, they reported higher positivity rates to questions about sexual life and treatment on the Dermatology Life Quality Index questionnaire. Major allergens in Busan were cobalt chloride (60.1%), nickel sulfate (52.0%), and potassium dichromate (50.9%), followed by thiomersal, balsam of Peru, and fragrance mix (17.2%, 15.4%, and 13.9%, respectively). Captan, budesonide, and colophony were more prevalent allergens in males. While the positive rate for thiomersal were higher in the younger age group, balsam of Peru allergen was higher in the older age group. Conclusion: This study represents the first PT analysis conducted in Busan, revealing metal-related allergen as the most common cause of CD, with variations observed across sex and age. Further research is needed to validate these findings and elucidate the sources and pathways of allergen exposure in Busan. (Allergy Asthma Respir Dis 2024;12:85-92)
비대칭 스퍼터링에 의한 TiAIN/CrN 나노 다층 박막의 합성 및 특성 분석에 관한 연구
김광석(GwangSeok Kim),김범석(Bom Sok Kim),이상율(SangYul Lee) 한국표면공학회 2005 한국표면공학회지 Vol.38 No.6
In this work a multi-layered nanostructured TiAlN/CrN superlattice coatings was synthesized using closed-field unbalanced magnetron sputtering method and the relationships between their superlattice period (1), micro-structure, hardness and elastic modulus were investigated. In addition, wear test at 500℃ and oxidation resistance test at 900℃ were performed 10 investigate high temperature properties of these thin films. The coatings were characterized in terms of microstructure and mechanical properties by transmission electron microscopy (TEM) and nano-indentation test. Results from TEM analysis showed that superlattice periods was inversely proportional to the jig rotation speed. The maximum hardness and elastic modulus of 37 ㎬ and 375 ㎬ were observed at superalttice period of 6.1 ㎚ and 4.4 ㎚, respectively. An higher value of microhardness from TiAlN/CrN thin films than either TiAlN (30 ㎬) or CrN (26 ㎬) was noted while the elastic modulus was approximately an average of TiAlN and CrN films. These enhancement effects in superlattice films could be attributed to the resistance to dislocation glide across interface between the CrN and TiAlN layers. Much improved plastic deformation resistance (H³/E²) of 0.36 from TiAlN/CrN coatings was observed, compared with 0.15 and 0.16 from TiAlN and CrN, respectively. Also the wear resistance at 500℃ was largely increased than those of single TiAlN and CrN coatings and TiAlN/CrN coatings showed much reduced weight gain after exposure at 900℃ for 20 hours.