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The joint systems have been mainly used overlap joints and mechanical fixation methods of sheet-membrane composite waterproofing methods on roof exposure waterproofing of structure. However, these methods have been frequently occurred damages at joints by contraction and thermal behavior of sheet. The area applied in this study is an exposed area of the rooftop, and stainless steel sheet was used in a preceding study to secure maximum specimen performance from tensile force, deformation and elastic force, where waterproofing sheets of a synthetic polymer system as an actual material for the complex waterproofing construction method were tested using identical conditions. Test pieces were divided into a total of 2 kinds consisting of a general form and a pierced form, and coating materials divided into a total of 2 kinds such as cross section coating and both side coating with application of 4 types in total including general form, general form, pierced form, pierced form. In this research, we find proper joint distance in butt joint of sheet-membrane composite waterproofing methods and select the stable joint type by tensile strength test at joints.
N/A Objectives: Despite major advances in understanding of pathogenesis and treatment, the mortality associated with bronchial asthma has risen progressively since 1977. Analysis of contemporary medical history indicates that at least some excess deaths in bronchial asthma is related to the use of inhaled beta-adrenergic agonists. So we undertook a study to examine the effects of inhaled beta-2 agonist in obstructive airway disease patients group whether it can produce abnormal cardiac function even in usual dosage. Methods: Heart rate, QTc interval, and serum potassium changes after inhalation of salbutamol were studied in 20 normal controls, 11 asthmatic patients, and 9 chronic obstructive pulmonary disease (COPD) patients. Base-line serum potassium level and electrocardiogram were taken just before and 60 minutes after 2 puffs(200㎍) inhalation of salbutamol. Three days later, repeated base-line serum potassium and electrocardiogram were taken just before and 60 minutes after 4 puffs(400 ㎍) inhalation of salbutamol. Results: The serum potassium concentraton was changed in normal control and COPD subjects, but statistical singificance was not found. Prolongation of the QTc interval was significant in asthma and COPD subjects after 4 puffs inhalation of salbutamol (p<0.05). Changes in QTc interval following 2 puffs inhalation of salbutamol was significant only in COPD subjects (p=0.05). Conclusion: Salbutamol causes QTc prolongation in bronchial asthma and COPD patients group in usual dosage. Futher studies are recommanded to evlauate the clinical significancy of QTc prolongation after inhaled beta-2 agonist use.
얕은 토층의 무한사면 파괴가 예상되는 지역에서 안전율 계산에 영향을 주는 지역적 특징인 뿌리점착력을 고려하지 않은 무한사면 안전율은 뿌리점착력을 적용한 무한사면 안전율 보다 낮은 수치로 해석되는 경향이 있다. 따라서 합리적인 무한사면의 안전율을 계산하기 위하여 지역적 특징을 반영한 안전율 해석이 필요하다. 본 연구에서는 수목의 뿌리와 수관밀도가 무한사면의 안전율에 미치는 영향을 분석하기 위하여 기존 무한사면 안정해석 방법에 수관밀도를 고려한 뿌리 점착력 이론을 적용하여 안전율의 변화를 비교 분석하였다. 해석결과 뿌리점착력의 효과로 인하여 안전율이 증가하지만, 사면의 경사에 따라서 안전율의 증가량이 다른 것으로 분석 되었으며, 뿌리점착력의 보강 효과는 완만한 경사의 사면일수록 커지는 것으로 나타났다. The safety factor of an infinite slope tends to be analyzed as lower when the effects of root cohesion are not considered into the equation. Thus, it is essential to consider regional characteristics such as root cohesion and crown density in order to obtain a reasonable safety factor value. In this study, The safety factor of the landslide model, both before and after considering crown density and root cohesion, was calculated and a comparative analysis was carried out. The safety factor is increased by the effect of roots cohesion of the analysis results, the amount of increase in safety factor along the inclination of the slope angle has been analyzed with various things, the effect of reinforcing the roots cohesion, slope of the lower angle it was found that the higher the safety factor increase.