손상평가와 구조물 신뢰성과의 연계

박수용,Park, Soo Yong 한국강구조학회 2003 韓國鋼構造學會 論文集 Vol.15 No.1

구조물에 대한 비파괴 손상평가는 손상 전과 손상 후의 동적 특성으로부터 손상의 위치와 그 크기에 대한 정보를 제공한다. 기존 구조물의 시스템 신뢰도를 추정하기 위해서는 이러한 비파괴 손상평가의 결과가 부재요소의 파괴확률에 반영되어야 한다. 구조 부재의 파괴확률은 각 부재의 파괴함수로부터 신뢰성 이론을 이용하여 구할 수 있다. 본 논문에서는 각 부재의 파괴확률로부터 직접 구조 시스템의 파괴확률을 구할 수 있는 식을 제안하였다. 손상평가와 신뢰성평가 분야의 연계는 철골조 단층 프레임의 수치해석 모델에 인위적인 손상을 가하여 손상 전과 손상 후의 모달 변수를 이용하여 그 타당성을 입증하였다. Nondestructive Damage Evaluation (NDE) techniques yield the damage location and its size from the modal characteristics of pre-damaged and post-damaged structures. To predict the system reliability of the aging structure, results from the NDE are integrated into the element/component failure probabilities. The element/component failure probabilities can be calculated from failure functions for each element/component with the aid of techniques from a structural reliability analysis. In this paper, a method to estimate the system reliability of a structure that is based on the reliabilities of elements/components in a given structure is presented. The efficacy of the combination of the nondestructive damage detection and the structural reliability evaluation is demonstrated using pre-damaged and post-damaged modal data obtained from numerical simulations of a rigid frame.

주기적 모니터링을 통한 콘크리트 부유식 구조물의 구조 건전성 평가

박수용,천세용,김수훈 대한건축학회지회연합회 2017 대한건축학회연합논문집 Vol.19 No.3

본 연구의 목적은 주기적 모니터링을 통해 부유식 콘크리트 구조물의 구조 건전성을 평가하는 것이다. 실제 부유식 콘크리트 구조물을 대상으로 주기적 모니터링을 실시하여 동적 특성을 추출하였다. 추출된 동적 특성과 수치해석 모델을 이용하여 다음 두 가지 활동을 통해 구조 건전성을 평가하였다. 먼저, 비파괴 손상 평가기법을 이용하여 손상의 발생 및 진전을 평가하였으며, 균열도와의 비교를 통하여 그 결과의 신뢰성을 검증하였다. 다음으로, 구조계 추정기법을 이용하여 강성 저하 추이를 분석하였다. 그 결과로, 구조물의 요구 성능 확보여부를 판단할 수 있었다. The objective of this study is to evaluate the structural integrity of the floating concrete structure through periodic monitoring. Dynamic characteristics of the actual floating concrete structure were extracted from the periodic monitoring. The structural integrity using the extracted dynamic characteristics and numerical model was evaluated by the following two activities. First, the structure damage was evaluated for occurrence and progress using the damage detection method. The reliability of the results was verified by comparison with the crack drawing. Second, the stiffness degradation trend was analyzed using the system identification method. As a result, the structural satisfy performance criteria and safety.

고온 유리 성형 공정을 위한 직육면체형 Sodium 히트파이프의 실험 연구

박수용,부준홍,김준범,Park, Soo-Yong,Boo, Jun-Hong,Kim, Jun-Beom 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11

To enhance isothermal characteristics of glass-farming surface, a rectangular parallelepiped heat pipes was fabricated, tested, and analyzed. The working fluid was sodium and the wall material was stainless steel 304. The dimension of the heat pipe was 210 (L) $\times$ 140(W) $\times$ 92(H)mm. A lattice structure covered with screen mesh was inserted to promote return of working fluid. The bottom side of heat pipe was heated electrically and the top side was cooled by liquid circulation. The temperature distribution at the bottom surface was of major concern and was monitored to determine isothermal characteristics. A frozen start-up of rectangular parallelepiped liquid metal heat pipe was tested. The operating mode of the sodium heat pipe was affected by the temperature of cooling zone, input heat flux, and the operating temperature of heat pipe. The heat pipe operated in a normal fashion as long as the heat flux was over 5.78W/cm$^2$, and the inside wall temperature of condenser part was above 95$^{\circ}C$ The maximum temperature difference at the bottom surface was observed to be 32$^{\circ}C$ when the operating temperature of the heat pipe was operating normally around 50$0^{\circ}C$. The result showed that a sodium heat pipe was very effective in reducing significantly the temperature difference in the glass-forming surface.

블록체인과 거래혁명

박수용 한국정보통신설비학회 2017 한국정보통신설비학회 세미나 Vol.2017 No.11

트러스 구조물 내 손상부위 추적에 관한 실험적 검증

박수용,최상현 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.3

손상평가 및 구조계 추정기법의 적용사례

박수용 한국전산구조공학회 2003 전산구조공학 Vol.16 No.1

중소기업경영자의 긍정적 리더십, 구성원의 긍정적 삶의 태도, 학습조직활동, 직무열의, 조직성과 변인간의 구조적 관계

박수용,최은수 한국유통과학회 2015 유통과학연구 Vol.13 No.12

Purpose – In today’s era of globalization, the competitive power of enterprises is growing fiercer, calling for organizations to be able to respond flexibly to survive and maintain predominance in competition. In turn, keen competition exists among enterprises for the systematic management of members’ knowledge to secure predominance in such competition. Under such circumstances, SMEs must find and utilize positive causes for change that affect organizational performance. The objective of this study is to analyze the structural relationship between four factors known from prior research—a CEO’s positive leadership, members’ positive life positions, learning organization activities, and job engagement—and organizational performance. Research design, data, and methodology – To achieve this objective, this study established the following four research problems. First, do CEOs’ positive leadership, members’ positive life positions, learning organization activities, and job engagement affect organizational performance? Second, do CEOs’ positive leadership, members’ positive life positions, and learning organization activities affect job engagement? Third, do CEOs’ positive leadership and members’ positive life positions affect learning organization activities? Fourth, does CEOs’ positive leadership affect members’ positive life positions. Additionally, to achieve the objective of this study, the re-search model was selected on the basis of a documentary survey of 787 full-time employees at 100 SMEs, which was used to collect related data. Results – The following conclusions were drawn. First, a CEO’s positive leadership directly affects members’ positive life positions, learning organization activities, and job engagement. Second, positive leadership only indirectly affects organizational performance. That is, positive leadership has an indirect effect on organizational performance given the parameters of members’ positive life positions, learning organization activities, and job engagement. Third, members’ positive life positions directly affect learning organization activities and job engagement, but indirectly affect organizational performance with learning organization activities and job engagement as parameters. Fourth, learning organization activities directly affect job engagement and organizational performance. Additionally, learning organization activities indirectly affect organizational performance with job engagement as a parameter. Fifth, job engagement directly affects organizational performance. Conclusions – A CEO’s positive leadership and members’ positive life positions do not directly affect organizational performance but have a positive effect through learning organization activities and job engagement. In particular, CEOs’ positive leadership was proven to be the major factor to affect members’ positive life positions, learning organization attitudes, and job engagement, and learning organization activities and job engagement were found to be major factors that directly affect organizational performance. Considering these conclusions, the direct effect of a CEO’s positive leadership on organizational performance is not statistically significant but seems to affect members’ positive life positions, learning organization activities, and job engagement, which ultimately affects organizational performance. In addition, CEOs’ positive leadership is an important factor that enhances the factors with the strongest effect on organizational performance—ac-tivities of learning organizations and job engagement.

철골조 바닥구조의 수직진동 평가기준적용성에 관한 연구 ( A Study on the Application of Evaluating Vertical Vibration Standard in Steel Structure Slab )

박수용,이성수,홍갑표 대한건축학회 2002 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.22 No.2

중소기업 경영자의 온정적 합리주의 리더십 전략이 혁신활동과 경영성과에 미치는 영향

박수용,이동형 한국산업경영시스템학회 2018 한국산업경영시스템학회 학술대회 Vol.2018 No.추계

Heated wire humidification circuit attenuates the decrease of core temperature during general anesthesia in patients undergoing arthroscopic hip surgery

박수용,윤석화,윤앤미선,송승현,황자경 대한마취통증의학회 2017 Korean Journal of Anesthesiology Vol.70 No.6

Background: Intraoperative hypothermia is common in patients undergoing general anesthesia during arthroscopic hip surgery. In the present study, we assessed the effect of heating and humidifying the airway with a heated wire humidification circuit (HHC) to attenuate the decrease of core temperature and prevent hypothermia in patients undergoing arthroscopic hip surgery under general anesthesia. Methods: Fifty-six patients scheduled for arthroscopic hip surgery were randomly assigned to either a control group using a breathing circuit connected with a heat and moisture exchanger (HME) (n = 28) or an HHC group using a heated wire humidification circuit (n = 28). The decrease in core temperature was measured from anesthetic induction and every 15 minutes thereafter using an esophageal stethoscope. Results: Decrease in core temperature from anesthetic induction to 120 minutes after induction was lower in the HHC group (−0.60 ± 0.27°C) compared to the control group (−0.86 ± 0.29°C) (P = 0.001). However, there was no statistically significant difference in the incidence of intraoperative hypothermia or the incidence of shivering in the postanesthetic care unit. Conclusions: The use of HHC may be considered as a method to attenuate intraoperative decrease in core temperature during arthroscopic hip surgery performed under general anesthesia and exceeding 2 hours in duration.