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Fuzzy 개념을 이용한 RC도로교의 건전성평가 모델 개발
나기현,박주원,이증빈,정철원,Na, Ki-Hyun,Park, Ju-Won,Lee, Cheung-Bin,Jung, Chul-Won 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 논문집 Vol.2 No.2
In this study, an attempt is made to apply the concept of fuzzy-bayesian theory to the integrity assessment of RC highway bridge, and uncertainty states are represented in terms of fuzzy sets which define several linguistic variables such as "very good", "good", "average", "poor", "very poor", etc. Especially, the concept of fuzzy conditional probability aids to derive a new reliability analysis which includes the subjective assessment of engineers without introducing any additional correction factors. The fuzzy concept are also used as reliability indexes for the condition assessment based on the proposed models, the proposed fuzzy theory-based approach with the results of visual inspection and extensive field load tests are applied to the integrity assessment of a new RC highway bridge, namely, Jichok bridge.
퍼지결함수분석을 이용한 교량시스템의 상태 및 안전성평가
이증빈 ( Lee Cheung-bin ),나기현 ( Na Ki-hyun ),손용우 ( Sohn Young-woo ),박주원 ( Park Ju-won ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.3 No.1
This paper aims to propose a method that helps maintenance engineers to evaluate the damage states of bridge systems by using a Fuzzy Fault Tree Analysis(FFTA). It may be stated that Fuzzy Fault Tree Analysis may be very useful for the systematic and rational condition and safety assessment for real bridge systems problems because the approach is able to effectively deal with all the related bridge system damages in terms of the linguistic variables that incorporate systematically experts experiences and subjective judgement.
박주원 ( Park Ju-won ),나기현 ( Na Ki-hyun ),손용우 ( Sohn Yong-woo ),이중빈 ( Lee Cheung-bin ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
The study is intended to propose a systematic procedure for the development of the condition assessment based structures safety and cost effective performance criteria for design and upgrading of bridge structures. A set of cost function models for life cycle cost analysis of bridge structures is proposed and thus the expected total life cycle costs(ETLCC) include initial(design, testing and construction) costs and direct · indirect damage costs considering repair · replacement costs, human losses and property damage costs, road user costs, and indirect regional economic losses costs. Optimum safety indices are presented based on expected total cost minimization using only tree parameters, which are the level of the failure cost to the initial cost(τ), the extent of increased initial cost by improvement in safety(ν) and the order of the initial cost function(n). From the numerical invetigations. it may be positively stated that the proposed optimum design procedure for bridge structures based on the ETLCC will lead to more rational, economical and safer design.
박주원 ( Park Ju-won ),나기현 ( Sohn Yong-woo ),손용우 ( Na Ki-hyun ),이증빈 ( Lee Cheung-bin ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
The study is intended to propose a systematic procedure for the development of the condition assessment based structures safety and cost effective performance criteria for design and upgrading of deteriorating bridge structures. A set of cost function models for life cycle cost analysis of bridge structures is proposed and thus the expected total life cycle costs include initial(design, testing and construction) costs, maintenance costs expected strength failure costs and expected service ability failure costs. Optimum safety indices are presented based on expected total cost minimization using only tree parameters, which are the level of the failure cost to the initial cost(τ), the extent of increased initial cost by improvement in safety(ν)and the order of the initial cost function(n). It may be expected that the proposed approach can be effectively utilized for the development of optimal performance criteria for design and upgrading of deteriorating bridge structures.
폐 산세 용액으로부터 공침 반응에 의한 지르코늄 회수 시 BaF<sub>2</sub> 입도 영향 및 Ba<sub>2</sub>ZrF<sub>8</sub>의 진공증류 특성
최정훈,하이크 네르시시안,한슬기,김영민,박철호,강종원,나기현,김정훈,이종현,Choi, Jeong Hun,Nersisyan, Hayk,Han, Seul Ki,Kim, Young Min,Park, Cheol-Ho,Kahng, Jong Won,Na, Ki Hyun,Kim, Jeong hun,Lee, Jong Hyeon 한국자원리싸이클링학회 2017 資源 리싸이클링 Vol.26 No.6
핵연료 피복관은 필거링 및 열처리 공정에 의해 제조되며, 핵연료 피복관 표면의 불순물 및 산화층을 제거하기 위해 산세 공정이 진행된다. 산세 공정 중 산세 용액으로 지르코늄이 용해되어 포화상태가 될 시 폐 산세 용액은 전량 폐기 되며 용액 내 지르코늄 또한 폐기된다. 그러므로 지르코늄을 재활용하기 위해 $BaF_2$를 폐 산세 용액에 첨가하여 공침 반응에 의해 $Ba_2ZrF_8$을 형성시켰다. 한편, 전해제련을 통해 Zr을 회수하기 위해서는 $Ba_2ZrF_8$을 전해질로 사용해야하지만, 용융점이 $1053^{\circ}C$로 높다. 따라서 $ZrF_4$를 첨가하여 용융점을 낮추어야한다. 본 연구에서는 $Ba_2ZrF_8$을 진공 증류를 통해 $BaF_2$ 및 $ZrF_4$로 분리하는 연구를 진행하였다. 먼저, $BaF_2$ 입자크기($1{\mu}m$, $35{\mu}m$, $110{\mu}m$)에 따른 침전 특성을 실험하였다. 그리고 진공 증류를 통해 수득된 $BaF_2$를 볼밀링을 통해 분쇄하였으며, 침전 공정을 거치지 않은 $BaF_2$와 침전 효율을 비교하였다. Nuclear fuel cladding tube is fabricated by pilgering and annealing process. In order to remove impurity and oxygen layer on the surface, pickling process is carried out. When Zirconium(Zr) is dissolved and saturated in acid solution during the pickling process, all the waste acid including Zr is disposed. Therefore, $BaF_2$ is added into the waste acid to extract Zr and $Ba_2ZrF_8$ is subsequently formed. To recycle Zr by electrowinning process, $Ba_2ZrF_8$ is used as electrolyte, but it has high melting point ($1053^{\circ}C$). $ZrF_4$ should be added into $Ba_2ZrF_8$ to decrease the melting point. In this paper, it was investigated that $Ba_2ZrF_8$ was separated to $BaF_2$ and $ZrF_4$ by vacuum distillation. Firstly, $BaF_2$ with different particle size ($1{\mu}m$, $35{\mu}m$, $110{\mu}m$) was added into the waste acid and the respective precipitation property was estimated. $BaF_2$ obtained by vacuum distillation was shattered by ball-milling with different time. The precipitation efficiency was compared with $1{\mu}m$ of ${BaF_2}^{\prime}s$ one, which was not used as precipitation agent.