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김형준(Hung-Jun Kim),신준석(Jun Seok Shin),김진오(Jin O Kim),김형철(Hyung Chul Kim) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.5월
Traditional maintenance planning is based on a constant maintenance interval for equipment life. In order to consider economic aspect for time based preventive maintenance, preventive maintenance is desirable to be scheduled by RCM(Reliability-Centered Maintenance) evaluation. The main objective of RCM is to reduce the maintenance cost, by focusing on the most important functions of the system and avoiding or removing maintenance actions that are not strictly necessary. So, Markov state model is utilized considering stochastic stale in RCM In this paper, a Markov stale model which can be used for schedul ing and optimization of maintenance is presented. The deterioration process of system condition is modeled by the stepwise Markov model in detail. Also, because the system is not continuously monitored, the inspection is considered In case study, simulation results about RCM will be shown using the real historical data of combustion turbine generating unit in Korean power systems.
불연속웨브가 도입된 프리스트레스트 강-콘크리트 합성보의 휨성능 평가
오재열(Oh, Jae-Yuel),이득행(Lee, Deuck-Hang),김강수(Kim, Kang-Su),강현(Kang, Huyn),김흥열(Kim, Heung-Youl),김형준(Kim, Hyung-Jun) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.1
A corrugated steel plate has very little axial stiffness in longitudinal direction due to the accordion effect resulted from its geometric characteristics. Based on this phenomenon, the corrugated webbed steel beams can be utilized for prestressed members to get greater prestressing efficiency on the top and bottom flanges of steel beams that are the main resistant elements against the bending moment. Also, the resistance to any unbalanced construction loading can be improved and the composite action between concrete and steel web can be significantly enhanced by the corrugated web. Due to this reason, researches on the corrugated webbed steel beams have been continued so far. Manufacturing the corrugated webs, however, may have considerable disadvantageous in workability and economical point of view. In this study, therefore, the prestressed composite beam with discontinuous webs has been developed to improve such shortcomings of the corrugated webbed steel beam system. In order to verify the structural performance of the developed prestressed steel-concrete composite beam, its prestressing efficiency has been compared to the steel beams with corrugated webs by finite element analysis, and two full-scaled specimens were also fabricated and tested to evaluate their structural behavior.