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김남식,이상순,정우정,이동근,Kim, Nam Sik,Lee, Sang Soon,Chung, Woo Jung,Lee, Dong Guen 대한토목학회 1992 대한토목학회논문집 Vol.12 No.4
유사동적실험은 시험체에 대한 물리적인 실험에 이론적인 수치해석방법을 접목시킨 실험기법으로서, 특히 규모가 큰 시험체에 대하여 진동대실험 보다 효율적으로 지진응답실험을 수행할 수 있도록 최근에 개발된 방법이다. 본 연구에서는 유사동적실험 수행과정에서 발생하는 실험오차를 분석하여 실험결과를 보정함으로서, 내진성능실험을 위해서 유사동적실험기법을 광범위하게 적용할 수 있는 가능성을 제시하고자 한다. The Pseudo-dynamic test is a new experimental technique for simulating the earthquake response of structures or structural components in the time domain. It is especially efficient for testing specimens that are too large, heavy or strong to be tested on a shaking table. But, in general, the responses obtained in the Pseudo-dynamic test can be distorted by the experimental errors inevitably during control and measurement procedures. The studies are to investigate the effects of the experimental errors on the Pseudo-dynamic responses and apply a correction method to the Pseudo-dynamic testing algorithm. It is shown that the corrected responses using the equivalent energy compensation method are in a good correlation with the theoretical ones. Thus, the corrected Pseudo-dynamic responses could be reliable for evaluating the seismic performance of structural systems.
Future Risks in Patients With Severe Asthma
송우정,이지향,강예원,정우정,Kian Fan Chung 대한천식알레르기학회 2019 Allergy, Asthma & Immunology Research Vol.11 No.6
A major burden of severe asthma is the future risk of adverse health outcomes. Patients with severe asthma are prone to serious exacerbation and deterioration of lung function and may experience side effects of medications such as oral corticosteroids (OCSs). However, such future risk is not easily measurable in daily clinical practice. In particular, currently available tools to measure asthma control and asthma-related quality of life incompletely predict the future risk of medication-related morbidity. This is a significant issue in asthma management. This review summarizes the current evidence of future risk in patients with severe asthma. As future risk is poorly perceived by controlled asthmatics, our review focuses on the risk in patients with ‘controlled’ severe asthma. Of note, it is likely that long-term OCS therapy may not prevent future asthma progression, including lung function decline. In addition, the risk of drug side effects increases even during low-dose OCS therapy. Thus, novel treatments are highly desirable for reducing future risks without any loss of asthma control.
배준영 ( Bae Jun Young ),방진욱 ( Bang Jin Wook ),정우정 ( Chung Woo Jung ),김윤용 ( Kim Yun-yong ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
Based on the study of chloride migration coefficient and hydration heat evolution, it was found that the use of ternary blended cement was effective to achieve desired service life and minimum crack index. On the other hand, a high level of compressive strength is required for marine concrete mix design.