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[제5분과/내구성/진단 및 보수·보강] 염해에 대한 해양 콘크리트 구조물의 내구성 평가
김성칠(Kim Sung-Chil),김해수(Kim Hea-su),전민하(Chun Min-Ha),김형윤(Kim Hyeong-yun) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Social overhead capitals such as roads, harbors and large structures have been recently constructed along with economic development. It is particularly expected that the various coastal structures, which are petroleum reserving facilities, entertainment facilities, and bridges connecting between island and land, or among islands, are rapidly increased and enlarged. Therefore, the durability assessment of concrete structures for salt-attack IS indispensable. When coastal concrete structures are designed, it is important to investigate collectively the design, construction and maintenance plans in order to enhance the endurance for salt-damage. When especially designing the durability for salt-attack, the primary design must be carried out based upon the allowance for crack width, the limit of water-cement ratio, the limit of concrete compression strength, the limit of the amount of cement per unit and the limit of covered thickness. In this research, a requirement design table was calculated with various environmental conditions according to the goal of durability lifetime specified on the data sheets. Diffusion equation was solved using Fick's diffusion law with the variable of the water-cement ratio. The universal validity and simplicity was investigated through the suggestion of requirement design table and real examples. As the result of investigation, the application capability of the suggested requirement design table was excellent, and the calculation for demanding cover was not needed. The investigation of goal durability period was easily verified through graphs.
김성칠 ( Kim Sung-chil ),김해수 ( Kim Hea-su ),전민하 ( Chun Min-ha ),김형윤 ( Kim Hyeong-yun ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.1
Social overhead capitals such as roads, harbors and large structures have been recently constructed along with economic development. It is particularly expected that the various coastal structures, which are petroleum reserving facilities, entertainment facilities, and bridges connecting between island and land, or among islands, are rapidly increased and enlarged. Therefore, the durability assessment of concrete structures for salt-attack is indispensable. When coastal concrete structures are designed, it is important to investigate collectively the design, construction and maintenance plans in order to enhance the endurance for salt-damage. When especially designing the durability for salt-attack, the primary design must be carried out based upon the allowance for crack width, the limit of water-cement ratio, the limit of concrete compression strength, the limit of the amount of cement per unit and the limit of covered thickness. In this research, a requirement design table was calculated with various environmental conditions according to the goal of durability lifetime specified on the data sheets. Diffusion equation was solved using Fick’s diffusion law with the variable of the water-cement ratio. The universal validity and simplicity was investigated through the suggestion of requirement design table and real examples. As the result of investigation, the application capability of the suggested requirement design table was excellent, and the calculation for demanding cover was not needed. The investigation of goal durability period was easily verified through graphs.
소아 천식 환자에서 비염과 천식과의 관계: 알레르기비염과 비알레르기비염 비교
권은별 ( Eun Byul Kwon ),백지현 ( Ji Hyeon Baek ),김형윤 ( Hyeong Yun Kim ),윤정원 ( Jung Won Yoon ),신윤호 ( Youn Ho Shin ),지혜미 ( Hye Mi Jee ),최선희 ( Sun Hee Choi ),한만용 ( Man Yong Han ) 대한소아알레르기호흡기학회(구 대한소아알레르기 및 호흡기학회) 1991 소아알레르기 및 호흡기학회지 Vol.1 No.3
Purpose: We aimed to determine the prevalence of allergic rhinitis and nonallergic rhinitis, difference in symptoms between allergic rhinitis and nonallergic rhinitis, and the association between lung function and the degree of asthma control in children with asthma. Methods: One hundred seventy patients who were followed-up for asthma treatment at the department of pediatrics of CHA Bundang Medical Center were enrolled in this study. We conducted the questionnaire regarding coexistence of rhinitis, childhood asthma control test (C-ACT), and the basic lung function test. The patients were classified as allergic rhinitis group and nonallergic rhinitis group according to the response to 11 common inhalation and food allergens, and assessed the degree of asthma control and the severity of rhinitis. Results: One hundred thirty patients (73%) were found to have rhinitis. Of these, 79 patients (53%) had allergic rhinitis and 34 patients (20%) had nonallergic rhinitis. The allergic rhinitis group was older than the nonallergic rhinitis group or the nonrhinitis group (7.73±2.85 vs. 5.97±2.48 vs. 6.12±2.70, P<0.001). Nasal itching sense was more prevalent in the allergic-rhinitis group than in the nonallergic rhinitis group (3.23±1.90 vs. 2.44±1.56, P=0.036). There was an inverse correlation between the rhinitis and C-ACT (r= .0.329, P<0.05). Of note, nasal obstruction symptom was highly correlated with C-ACT (r=.0.334, P<0.001). Conclusion: Allergic rhinitis and nonallergic rhinitis were highly prevalent in the pediatric patients with asthma and both of them had a significantly adverse impact on asthma control by rhinitis-itself. Therefore, regardless of atopic status, clinicians should focus on relieving rhinitis symptoms. (Allergy Asthma Respir Dis 2013;1:241-247)
소아 천식 환자에서 비염과 천식과의 관계: 알레르기비염과 비알레르기비염 비교
권은별 ( Eun Byul Kwon ),백지현 ( Ji Hyeon Baek ),김형윤 ( Hyeong Yun Kim ),윤정원 ( Jung Won Yoon ),신윤호 ( Youn Ho Shin ),지혜미 ( Hye Mi Jee ),최선희 ( Sun Hee Choi ),한만용 ( Man Yong Han ) 대한천식알레르기학회 2013 Allergy Asthma & Respiratory Disease Vol.1 No.3
Purpose: We aimed to determine the prevalence of allergic rhinitis and nonallergic rhinitis, difference in symptoms between allergic rhinitis and nonallergic rhinitis, and the association between lung function and the degree of asthma control in children with asthma. Methods: One hundred seventy patients who were followed-up for asthma treatment at the department of pediatrics of CHA Bundang Medical Center were enrolled in this study. We conducted the questionnaire regarding coexistence of rhinitis, childhood asthma control test (C-ACT), and the basic lung function test. The patients were classified as allergic rhinitis group and nonallergic rhinitis group according to the response to 11 common inhalation and food allergens, and assessed the degree of asthma control and the severity of rhinitis. Results: One hundred thirty patients (73%) were found to have rhinitis. Of these, 79 patients (53%) had allergic rhinitis and 34 patients (20%) had nonallergic rhinitis. The allergic rhinitis group was older than the nonallergic rhinitis group or the nonrhinitis group (7.73±2.85 vs. 5.97±2.48 vs. 6.12±2.70, P<0.001). Nasal itching sense was more prevalent in the allergic-rhinitis group than in the nonallergic rhinitis group (3.23±1.90 vs. 2.44±1.56, P=0.036). There was an inverse correlation between the rhinitis and C-ACT (r= -0.329, P<0.05). Of note, nasal obstruction symptom was highly correlated with C-ACT (r=-0.334, P<0.001). Conclusion: Allergic rhinitis and nonallergic rhinitis were highly prevalent in the pediatric patients with asthma and both of them had a significantly adverse impact on asthma control by rhinitis-itself. Therefore, regardless of atopic status, clinicians should focus on relieving rhinitis symptoms. (Allergy Asthma Respir Dis 2013;1:241-247)