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영향선을 이용한 강상판 교량의 구스 아스팔트 포장에 대한 근사해석 연구
서기홍,가훈,공민식,임성순 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 논문집 Vol.10 No.4
본 연구는 포장재의 높은 온도로 인해 발생하는 교량의 구조거동을 해석대상모델로 선택하여 열효과로 인한 변형이론를 정리하고 시공단계별 포장에 따른 교좌장치의 열 효과를 고려한 근사법의 제시를 연구목적으로 한다. 일반적으로 열영향은 대상 구조물의 형상, 크기 및 경계조건과 시간에 종속되는 대표적인 초기응력문제이다. 본 연구는 열영향을 시간에 독립된 초기응력문제로 가정하고 이를 등가의 초기하중으로 변환하여 이동하중처럼 재하함으로서 교좌장치에 발생하는 반력 및 변위에 대한 영향선 해석을 수행하였다. 임의로 선정한 연속된 포장구간에 대해 계산된 영향선을 이용하여 교좌장치들에 발생하는 열영향을 최소화하는 최적의 시공단계를 결정하였다. In this study, steel deck bridges are chosen as analytic model to show the structural behaviors generated by high temperature of pavement and to formulate the simplified approximate analysis of thermal effects. In general, the thermal effect is changed by the material property of pavements and environmental temperature as well as shape, size and boundary conditions of bridge. Specially, this effect is the representative initial stress problem dependent on time. The thermal effect, however, does not depend on time and thermal effect is regarded as initial load in this study. After these thermal loading is modelled as moving loads, influence lines of reactions of shoes are calculated and the successive pavement steps with arbitrary segments are determined to minimize the thermal effect of shoes by influence line.
병원내 의료기기 교체의 우선순위 결정을 위한 단순평가법 개발
서기홍,박은경,최동일 대한의용생체공학회 2020 의공학회지 Vol.41 No.6
The importance of quality control has been emphasized to maintain safety of patients and satisfaction of medical service with medical devices used in clinic. Accordingly, objective evaluation method and standards consistently has been brought up for demand to replace outdated medical devices in appropriate time and to maintain the quality of medical service. Though many studies made suggestions methods to determine what medical devices to be replaced first, these methods were difficult in practice for its complex evaluation criteria and long time to evaluate. Therefore, in this study, a simple evaluation method is developed to identify and prioritize medical devices that are ought to be replaced. For the development of this simple evaluation method, four major characteristics of technology, safety, finance, and user satisfaction, which are considered in clinics to evaluate medical device replacement, and 14 minor attributes are distinctively selected. Each characteristic is assessed in binary form of “YES” or “NO” to minimize its subjective nature. Using this method to evaluate sampled medical devices belonging to four different characteristics, devices are suggested to be replaced in the current financial year or in the following financial year, or re-evaluated by the end of this financial year. Such results of evaluation can amend the subjective nature of existing evaluation method and give objective standards more promptly.
서기홍 ( Seo Ki-hong ),임성순 ( Yhim Sung-soon ),박원찬 ( Park Won-chan ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
Bridge design is developing that increase use of development of structural material and bridge of new form, usability of existing construction. Bridge with E-beam(Eccentric-beam) which is developed by a new type is used for analysis model in this study. Contrary to existing bridge which used PCS girder, E-beam increases rigidity of girder section and enlarges eccentricity between neutral axis of section and prestressed tendon by reinforcing steel plate into upside of girder. This study analyzed application through comparing theoretical analysis result with moving load test result of the bridge which used a new type of PSC E-beam.