복단면 개수로 흐름 난류모델링

이환우(Lee, Hwan-Woo),최성욱(Choi, Sung-Uk) 대한토목학회 2013 대한토목학회 학술대회 Vol.2013 No.10

인지 다양성이 직무만족도에 미치는 부정적 영향: 친사회적 동기의 상쇄 조절효과

이환우 ( Hwanwoo Lee ) 한국유통경영학회 2021 유통경영학회지 Vol.24 No.4

Purpose: Using job satisfaction and cognitive diversity theories, the purpose of this study was to test the effect of cognitive diversity on job satisfaction. Moreover, the author theorized and tested how prosocial motivation of employees can serve as boundary conditions that affect the relationship between cognitive diversity and job satisfaction. Research design, data, and methodology: Using a total of 95 MBA students from a large national university in South Korea, this study conducted a hierarchical linear modeling with related variables to examine the relationships among cognitive diversity, job satisfaction, and prosocial motivation. Results: The authors demonstrated that perceived level of cognitive diversity has an negative relation on job satisfaction. Despite the generally negative linkage between cognitive diversity and job satisfaction, the most crucial suggestion of the finding was that employee’s prosocial motivation also had an important role in responding to the relationship. For instance, employees with higher (rather than lower) prosocial motivation were more likely to have higher level of job satisfaction Implications: This study contributes to the research areas of cognitive diversity and job satisfaction. The research confirmed that cognitive diversity can be negative on job satisfaction. Furthermore, prosocial motivation had an offsetting moderation effect on the relationship between cognitive diversity and job satisfaction.

중소규모 사업용 BIM을 위한 데이터 사전의 활용

이환우,이경섭,김광양,Lee, Hwan Woo,Lee, Kyung Sub,Kim, Kwang Yang 한국전산구조공학회 2013 한국전산구조공학회논문집 Vol.26 No.6

건설 산업의 전반적인 생산성 향상을 위하여 시설물의 전 생애주기에 걸쳐 정보의 시스템화가 요구되고 있다. 정보를 시스템화하는 방법의 하나로 3차원 정보모델을 기반으로 정보 관리하는 기술인 BIM(Building Information Modeling)이 활발하게 연구되고 있다. 하지만 BIM 연구의 초점은 대형 사업장에 맞추어져 있으며 중소규모 사업장을 위한 BIM 연구는 미비한 실정이다. 중소규모 사업장의 경우 대형 사업장보다 정보 손실이 더욱 심각하지만, 투자 자원의 부족으로 인해 BIM을 도입하기에는 힘든 실정이다. 따라서 이 논문에는 과도한 투자 없이 BIM의 효과를 얻을 수 있는 중소규모 사업장 대상 맞춤형 BIM 시스템 개발을 위한 연구를 수행하였다. 이를 Pseudo BIM(이하, 의사BIM)이라 정의하였다. 그리고 의사 BIM의 개념과 구축방법에 따라 PLIB Part 42, 건설정보분류체계 등을 활용하여 의사 BIM의 엔진 구조를 담당하는 데이터 사전 구축 방법을 제시하고 Pilot test를 실시하여 의사 BIM의 유효성을 검증하였다. The systemization of construction information is required over whole life cycle of facilities to improve productivity of construction industry. BIM(Building Information Modeling) is a technology to manage information based on 3D information model. It has been actively suggested as one of the alternatives. However, it may be currently concentrated on the large project while the small and medium project based on BIM are slightly treated in indifference. In the case of small and medium project, the loss of information has been occurred more seriously than large project. However, it is hard to introduce BIM to the small and medium companies due to the lack of investment resources. This study has been performed to set up information management system based on BIM considering characteristics of small and medium project without excessive investment. In this study, pseudo BIM is defined as BIM for small and medium project. The concept of pseudo BIM has been suggested. The PLIB of ISO and construction information classification system of MOLIT in Korea are used to construct data dictionary for pseudo BIM. A pilot test is performed to verify the effectiveness of pseudo BIM.

동심도 5μm 이내 2-head 동시연마기에 ECO-청정처리 시스템 적용 방안

이환우(Hwan-Woo Lee),김기수(Ki-Su Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12

포장체의 강성이 강상판의 거동에 미치는 영향에 관한 기초연구

이환우 ( Lee Hwan-woo ),정두회 ( Jung Du-hwoe ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.1

The pavement stiffness is scarcely used in structural analysis to design the superstructure of bridge. It is reasonable not to consider it in the case of asphalt concrete pavement over concrete deck because the pavement stiffness compared with the concrete deck plate can be ignored. However, sometimes, the pavement materials have a similar amount of elastic modulus to concrete and are applied to the orthotropic steel deck plate which has relatively less stiffness compared with the concrete deck plate. In this paper, the steel plate deck of a real bridge project was analyzed by considering the pavement stiffness by linear elastic FEM. It was assumed that a perfect bond between the steel plate deck and the pavement exited. The results indicated that the structural behavior of the orthotropic steel deck plate can be estimated enough to affect the evaluation result of structural capacity in some cases. Therefore, the investigations by experimental tests and more advanced numerical model are indispensible in figuring the design formula for considering the effects of pavement stiffness in the structural analysis of an orthotropic bridge.

활하중 분배계수식의 개발을 위한 구조해석모델 비교

이환우 ( Lee Hwan-woo ),김광양 ( Kim Kwang-yang ),김관수 ( Kim Gwan-soo ),고동원 ( Ko Dong-won ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1

This study has been started for the development of a refined live load distribution formula that has safety and precision toward I type prestressed concrete girder bridge. This type of bridge is mainly applied to short span bridges that are 25 ~ 40m in length. Based on various structure analysis models that are currently being applied as preceding studies for the development of live load distribution method, an analysis of flexural stiffness ratio for barrier and diaphragm has been performed. As the result of parametric analysis for the changes in flexural stiffness ratio, the effect of barrier on load distribution showed as insignificant in all structural analysis models while analyzing the deflection distribution. Also, the deflection distribution of the models with stiffness of 25% in which the diaphragm eccentricity is accounted for as same as the models with stiffness of 100% in which the diaphragm eccentricity is unaccounted for. This results are verified through the comparison with a experimental data.

눈에는 눈 이에는 이? 비인격적 감독에 있어 상사에 대한 부하의 연민과 용서

이환우 ( Lee Hwan Woo ) 한국인적자원관리학회 2021 인적자원관리연구 Vol.28 No.1

본 연구의 목적은 귀인이론에 근거하여 비인격적 감독을 상사 탓으로 돌리는 부하의 경우 상사에 대한 분노와 공격성이 강화될 것이고, 자신의 탓으로 돌리는 부하는 비인격적 대우를 당함에도 불구하고 상사에 대한 연민의 감정과 용서의 행동에 긍정적일 것임을 실증적으로 검증하는데 있다. 비인격적 감독이라는 자극에 반응하는 부하직원의 감정과 행동을 귀인이론의 핵심인 사건(비인격적 감독)의 원인에 대한 파악과 연관 지어 이해하는데 그 의의가 있다. 따라서 본 논문은 부하가 자신에게 가해진 비인격적 대우의 원인을 어디로 돌리는 지에 관한 귀인의 대상이 어떻게 부하의 다양한 감정과 반응에 영향을 줄 수 있는지에 관한 조절된 매개 연구모형을 테스트하였다. 329명의 설문 응답을 분석한 결과, 비인격적 감독이 상사에 대한 연민을 통해 상사에 대한 용서와 간접적으로 관련이 있다는 것을 발견했다. 또한 자기귀인이 상사에 대한 연민을 통해 상사에 대한 용서로 이어지는 간접 영향을 조절함을 발견했다. 본 논문의 연구결과는 비인격적 감독으로부터 기인하는 부하의 다양한 감정과 행동의 관계를 밝히며, 특히 부하의 상사에 대한 연민과 용서라는 새로운 개념을 검증한 점에서 이론적 시사점을 제공한다. 이상의 결과와 시시점을 바탕으로 본 연구는 비인격적 감독의 피해자중 왜 일부는 침묵하고 일부는 그렇지 않은지에 대한 이유와 메커니즘을 보여줌으로써 비인격적 감독 연구 분야에 기여한다. Based on the atturibution theory, the purpose of this study is to show that subordinates who attribute abusive supervision to supervisors will strengthen their anger toward supervisor and supervisor-directed aggression, but those who attribute it to themselves will be positive in their sympathy and forgiveness for supervisor. It is meaningful to understand the emotions and behaviors of subordinates who respond to the stimulus of abusive supervision in relation to the understanding of the cause of events (abusive supervision), which is the core of attribution theory. Thus, we tested a moderated mediation model predicting various feelings and reactions given the attribution targets of abused subordinates. Using the survey responses of 329 participants, this study found that perception of abusive supervision was positively related to forgiveness for supervisor through its association with sympathy for supervisor. We also found that self-directed attribution moderated the indirect effects for forgiveness for supervisor through the sympathy for supervisor. Our results demonstrate the relationship between various emotions and behaviors of subordinates resulting from abusive supervision, and provide theoretical implications, especially in testing the novel idea of subordinates’ sympathy and forgiveness for supervisors. Based on our results and implications, this study contributes to the field of abusive supervision research by showing the reason and mechanism for why some recipients of abuse are silent but others not.

활하중 분배계수식의 개발을 위한 구조해석모델 비교

이환우(Lee Hwan-Woo),김광양(Kim Kwang-Yang),김관수(Kim Gwan-Soo),고동원(Ko Dong-Won) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1

This study has been started for the development of a refined live load distribution formula that has safety and precision toward I type prestressed concrete girder bridge. This type of bridge is mainly applied to short span bridges that are 25~40m in length. Based on various structure analysis models that are currently being applied as preceding studies for the development of live load distribution method, an analysis of flexural stiffness ratio for barrier and diaphragm has been performed. As the result of parametric analysis for the changes in flexural stiffness ratio, the effect of barrier on load distribution showed as insignificant in all structural analysis models while analyzing the deflection distribution. Also, the deflection distribution of the models with stiffness of 25% in which the diaphragm eccentricity is accounted for as same as the models with stiffness of 100% in which the diaphragm eccentricity is unaccounted for. This results are verified through the comparison with a experimental data.

콘크리트 사장교 장기거동에 대한 장래 위험성 예측 모델의 비교

이환우(Hwan Woo Lee),강대희(Dae Hui Kang) 한국방재안전학회 2008 한국방재안전학회 논문집 Vol.1 No.3

프리스트레스트 콘크리트 사장교는 재료의 특성상 크리프 및 건조수축 등에 의한 장기거동의 영향을 크게 받는다. 이 연구에서는 콘크리트 구조물의 장기거동 예측에 일반적으로 이용되는 CEB-FIP모델과 ACI 모델을 예제 교량에 적용하여 상대습도의 변화에 따른 영향을 알아보았다. 주형 모멘트의 경우 CEB-FIP 모델이 ACI 모델보다 상대습도 변화에 대해 더 큰 영향을 받으며 영향도도 경우에 따라서는 무시할 수 없을 것으로 나타났다. 또한 동일 조건에서도 두 모델간 장기거동이 일부 단면에서는 비교적 크게 차이가 났다. 따라서, 장기거동에 대한 수치해석 결과는 재료시험과 예측모텔간의 영향인자들에 대 한 민감도 분석을 거친 후에 보완하여 적용할 필요가 있다고 본다. The long-term behaviors of prestressed concrete cable-stayed bridges are considerably influenced by the time dependant material characteristics such as creep and shrinkage. This study investigated the influences of the change of relative humidity by application of the CEB-FIP model and ACT model, which are generally used in the prediction of long-term behavior of concrete structures. In case of the moment of girder, CEB-FIP model predicted a bigger effect of relative humidity change than the ACI model. Furthermore, the effect was significant. Also, the long-term behaviors between these models were different each other even under the same material condition. Therefore, the prediction of the long-term behavior should be compensated after comparative analysis with the results of material tests of each construction site and between the different models.

프리캐스트 세그멘탈 교량의 선형관리를 위한 GEOCON의 개발에 관한 연구(Ⅱ)

이환우(Lee, Hwan Woo),김종수(Kim, Jong Soo),곽효경(Kwak, Hyo-Gyoung) 한국콘크리트학회 1998 콘크리트학회논문집 Vol.10 No.2