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헬리콥터 로터 블레이드의 피로해석을 위한 하중 스펙트럼연구
오만석 ( Man Seok Oh ),김현덕 ( Hyun Duk Kim ),기영중 ( Young Jung Kee ),박정선 ( Jung Sun Park ) 한국항공운항학회 2007 한국항공운항학회지 Vol.15 No.3
In this paper, we decided the flight missions which describe the proper purpose of a utility helicopter, and developed the load spectrum by modifying Helix that is a fatigue load spectrum for blade of articulated helicopter rotor system. The developed load spectrum is applied to fatigue analysis of blade using with the stress-life(S-N) method. Also, the present results are compared with the original Helix data in order to verify the load spectrum that we generated.
오만석(Man-Seok Oh),김현덕(Hyunduk Kim),박정선(Jungsun Park),기영중 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this study, we have generated fatigue load spectrum that is using to prediction of life time for the helicopter rotor blades. We derive utility helicopter missions for the sake of generating load spectrum. Helix and Felix are standard loading sequences which relate to the main rotors of helicopters with articulated and semi-rigid rotors respectively. We got scale factors which is applied to specific case and it did be obtained through the finite element analysis tools. The fatigue life of the rotor blade is estimated by using MSC/Fatigue. We suggest that generated our fatigue load spectrum in conjunction with small utility helicopter should use to rotor blade fatigue test of the korea helicopter program.
프로젝트 상급자 특성이 프로젝트관리자의 보고 성향과 시스템 개발성과에 미치는 영향
장시영(Si Young Jang),오만석(Man Seok Oh) 한국데이타베이스학회 2012 Journal of information technology applications & m Vol.19 No.2
This study explores the reporting tendencies of project managers when sending a status reports to their respective senior managers in information systems development project. It also examines the effect of selective reporting on report quality and systems development performance. The research model is proposed based on literature survey as well as key points from Iacovou et al. [2009] which is an extension of selective reporting in information systems project. Analysis of responses from 257 project managers in information systems industry indicates that pessimistic reporting by project managers has negative effect on both report quality (mediator variable) and systems development performance, while optimistic reporting has no significant effect on systems development performance. The CEO interest has an impact on the senior manager's power, which in turn leads to optimistic reporting by project managers. The senior manager's character has an impact on the senior manager's leadership, which in turn leads to pessimistic reporting. No direct relationship exists either between CEO interest and optimistic reporting or between senior manager's character and pessimistic reporting. In addition, trust toward the senior managers is significantly related to pessimistic reporting. Finally, report tendencies are also found to be affected by the active/passive characteristics of project managers.
양용만,윤범수,전승목,이승근,백운율,오만석,Yong-Man Yang,Bum-Soo Yoon,Seung-Mok Jeon,Seung-Ken Lee,Un-Ryul Baek,Man-Seok Oh 한국복합재료학회 2023 Composites research Vol.36 No.5
Composite materials used in aircraft must be certified using approved materials to ensure the the airworthiness of the aircraft. Certification is carried out by verifying the physical properties and processes of the materials, and producing material and process specifications. The composite material certification system in ROK(Republic of Korea) has been established through the MOLIT(Ministry of Land, Infrastructure and Transport) pilot certification project for aircraft composite materials. Currently, the KIAST(Korea Institute of Aviation Safety Technology) operates and manages the certification and shared data system. This study identifies realm for improvement in the established certification system for aircraft composite materials based on empirical evidence and aims to propose measures for the certification and industrial promotion of domestically produced aircraft composite materials.
조직 구성원이 보유한 형식지와 암묵지의 조직소유인식에 관한 탐색적 연구
장시영,이정섭,오만석 한국경영과학회 2004 經營 科學 Vol.21 No.1
Today's organizations make every effort to achieve effective knowledge management, under the recognition that knowledge is a powerful, competitive weapon. For knowledge management to be successful, however, not only should knowledge be voluntarily offered by organizational members but also the organizational ownership of knowledge be perceived among members. In this regard, this study explores antecedent factors of organizational ownership of knowledge based on the extension of previous studies. The analysis of two hundred and fifty-five survey data indicates that cohesion of department or team, propensity to share, and task interdependence are significantly related to organizational ownership. The relationship turns out to be stronger with tacit knowledge than with explicit knowledge. Some suggestions are proposed for enhancing effective knowledge management.