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온라인 뉴스 기반 공공건설사업 갈등지수 산정에 관한 기초연구
백승원 ( Baek Seungwon ),한승헌 ( Han Seung Heon ),윤성민 ( Yun Sungmin ),임종록 ( Lim Jonglok ),남지현 ( Nam Jihyun ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
Conflict in public construction projects has increased for the last decades. It not only entails enormous social and economic costs but also makes stakeholders suffer from unnecessary expense and time waste. This study defines the the conflict index for public construction projects based on news data, and calculates conflict index for representative past and current public construction projects that has been deepened conflicts at the national level. The result indicates that the major conflict issue of the 2nd Jeju Airport Project are the environment and location whereas that of the Gaduk New Airport Project are the safety, location and necessity. This approach is expected to enable construction project managers to manage conflicts quantitatively based on comparing with past cases.
혼합 중복 κ-out-of-n 시스템 신뢰도 최적화 문제
백승원(Seungwon Baek),전건욱(Geonwook Jeon) 대한산업공학회 2013 대한산업공학회지 Vol.39 No.2
The k-out-of-n system with mixed redundancy is defined as k-out-of-n system which both includes warm-standby and cold-standby components. In case that operating components in the system fail and the system needs quick transition of standby components to operation state, the k-out-of-n system with mixed redundancy is useful for decreasing system failure rate and operational cost. Reliability-Redundancy Optimization Problem (RROP) involves selection of components with multiple choices and redundancy levels for maximizing system reliability with constraints such as cost, weight, etc. A solution methodology by using harmony search algorithm for RROP of the k-out-of-n system with mixed redundancy to maximize system reliability was suggested in this study.
데이터 기반 노후 철도시설 자산관리 전략 도출을 위한 벤치마킹 연구
백승원(Baek, Seungwon),유민경(Yoo, Minkyung),윤성민(Yun, Sungmin) 대한토목학회 2021 대한토목학회논문집 Vol.41 No.5
현재 국내 철도시설 운영기관은 노후 시설물 판단을 위한 명확한 정의와 시설물 보수/개량 우선순위 산정 방법이 정립되지 않아 성능중심 유지관리계획 수립에 어려움을 겪고 있다. 따라서, 본 연구는 선행연구에서 노후 시설물을 어떻게 정의하였는지 고찰하고, 국내 노후 철도시설물 관리제도와 미국 연방대중교통청(FTA)의 교통시설물 자산관리체계 비교분석을 통해 벤치마킹 포인트를 도출하였다. 노후 시설물 판단은 경과연수와 성능수준을 같이 고려해야 하며, 경과연수와 성능등급 간 관계를 통계적으로 분석하여 보수/개량 우선순위를 산정해야 한다. 또한, FTA와 같은 데이터 기반 철도시설 관리를 위해서는 표준 철도시설물 분류체계를 기반으로 시설물 분류 하위 수준에서 내용연수, 성능평가 결과, 유지관리비용 데이터베이스를 구축하는 것이 필요하다. 향후 데이터가 충분히 축적되면 성능중심 노후 철도시설 관리를 위한 효율적 예산집행계획 수립에 기여할 것으로 기대된다. Rail transit agencies in Korea have been struggling to set up a performance-based rail facility maintenance plan because there are no formal definition and decision criteria for aging infrastructure. This study investigates the definition of aging infrastructure through extensive literature review and identifies benchmarking criteria through comparison with rail transit facility management systems in Korea and United States. As results, an aging infrastructure should be defined considering both service age and performance level of a facility. The priority of repair/replacement should be also determined with reasonable criteria based on relationship between service age and performance level. To determine the definition and decision criteria, a practicable classification system for aging rail transit needs to be established in accordance with classification system for performance assessment. Furthermore, a comprehensive database needs to be built including useful life, performance level, and maintenance cost of each component of rail transit. It will allow establishing an efficient budget execution plan for aging infrastructure.
다변량 잠재성장모형을 활용한 중학생의 자기주도학습과 진로성숙도, 학교행복감 간 종단적 관계
백승원(Baek, Seungwon),윤채영(Yun, Chaeyoung) 한국열린교육학회 2020 열린교육연구 Vol.28 No.3
이 연구에서는 부산교육종단연구(BELS) 중1 패널 데이터를 활용하여 중학생의 자기주도학습과 진로성숙도, 학교행복감의 추이를 살펴보았다. 그리고 다변량 잠재성장모형을 활용하여 자기주도학습, 진로성숙도, 학교행복감의 종단적 관계를 검증하고, 연구변인 간 구조적 관계에서 진로성숙도의 매개효과를 검증하였다. 연구데이터는 부산교육종단연구(BELS) 중1 패널로 부산시 소재 중학교 50개교에 1학년 재학생 2,819명의 1차년도(2016년)~3차년도(2018년) 자료이다. 연구변인 간 관계의 초기상태 및 변화율에 영향을 검증하기 위해 다변량 잠재성장모형을 적용하였다. 연구결과, 첫째, 중학생의 진로성숙도와 학교행복감은 시간의 흐름에 따라 감소하는 것으로 나타났다. 둘째, 자기주도학습과 진로성숙도, 학교행복감 간 종단적 경로에서 자기주도학습은 진로성숙도와 학교행복감의 초기치에서 정적 영향을 미쳤으며, 진로성숙도와 학교행복감의 관계는 초기치에서 초기치, 변화율에서 변화율과 같이 동일한 잠재요인에서 정적 영향을 미쳤다. 하지만 자기주도학습의 변화율에서 학교행복감의 변화율에 미치는 영향은 유의하지 않았다. 셋째, 자기주도학습과 학교행복감 간 관계에서 진로성숙도의 종단적 매개효과를 검증하였다. 진로성숙도의 초기치는 자기주도학습의 초기치가 학교행복감의 초기치로 이어지는 경로를 부분매개하였으며, 진로성숙도의 변화율은 자기주도학습의 변화율이 학교행복감의 변화율로 이어지는 경로를 완전매개하였다. 이상의 결과를 바탕으로 논의 및 제언을 제시하였다. This study examined the changing patterns of self-directed learning, career maturity, and school happiness of middle school students by using BELS panel data. The longitudinal relationship of self-directed learning, career maturity, and school happiness was verified by using multivariate latent growth model, and the mediating effect of career maturity was verified in the structural relationship between research variables. The data of this study was 2,819 first graders in 50 middle schools in Busan. The multivariate latent growth model was applied to verify the effect of the initial status and rate of change of the relationship between the research variables. The results of this study were as follows: First, career maturity and school happiness of middle school students has been decreasing over time. Second, in the longitudinal path between self-directed learning, career maturity, and school happiness, self-directed learning had a positive effect on the initial value of career maturity and school happiness, and the relationship between career maturity and school happiness had a positive effect on the same latent factors as the initial value and the rate of change in the initial value. However, the effect of the change rate of self-directed learning on the change rate of school happiness was not significant; third, the longitudinal mediating effect of career maturity was verified in the relationship between self-directed learning and school happiness. The initial value of career maturity partially mediated the path that the initial value of self-directed learning leads to the initial value of school happiness, and the rate of change in career maturity fully mediated the path that the rate of change in self-directed learning leads to the rate of change in school happiness. Based on the results, limitations of this study and implications for future studies were discussed.