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쇼트 볼의 크기에 따르는 SCM822H 강의 무해화 균열크기 평가
최진우,윤서현,남기우 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.5
In this study, the harmless crack size was evaluated using carburized, quenched- tempered SCM822H steel. The possibility of detecting cracks that reduce the fatigue limit by non-destructive inspection was evaluated. The conclusions obtained are as follows. The retained austenite of surface was reduced by SP. About 35% and 65% of the retained austenite on the surface were transformed into strain-induced martensite, increasing the hardness by 79HV and 122HV over the as-received material. The maximum compressive residual stresses introduced on the surfaces were -695 MPa and -688 MPa, respectively. The fatigue limit increased by 1.48 times and 1.67 times, respectively, compared to the as-received material. The harmless crack size of SP specimen was determined differently depending on the shot ball size.
시스템 다이나믹스를 활용한 통합체계지원(IPS) 요소 분석
최진우,박정서,염윤섭 한국로지스틱스학회 2023 로지스틱스연구 Vol.31 No.5
Typically, research models focus on an object of interest. In the system model, detailed analysis is not performed on the small objects that make up the system. The opposite case is also the same. In both cases, the realism is not high. In this study, we focus on highly realistic models. In system implementation, configuration variables all function as one module. In the research model, a module for the failure phenomenon of the naval ship, which is the object that constitutes the system, is added, and the work capabilities and work hours of maintenance unit maintenance personnel function as a module. In other words, a highly realistic model is built through the implementation of a wide and deep system. Meanwhile, the Navy began integrated system support to increase efficiency. In developing the IPS elements of a naval ship under design, each element is studied individually. However, each element is not independent. Elements must be developed taking causal relationships into account. Using this study's integrated model, IPS elements can be developed in an integrated manner. This study describes the model composition and construction process and presents analysis examples of some IPS elements.
최진우,주형중,남정훈,윤순종,Choi, Jin-Woo,Joo, Hyung-Joong,Nam, Jeong-Hun,Yoon, Soon-Jong 한국복합신소재구조학회 2010 복합신소재구조학회논문집 Vol.1 No.2
이 논문에서는 기존의 CFFT(Concrete Filled FRP Tube) 복합재 말뚝의 휨강성을 확보하기 위한 새로운 복합재 말뚝형식을 제안하였다. 기존의 CFFT 복합재 말뚝은 필라멘트와인딩 공정으로 제작한 FRP를 사용하기 때문에, 압축력이 편심재하될 경우 휨거동에 대한 안전성을 확보하기 위해 철근 등 별도의 보강재를 필요로 한다. 이 연구에서는 별도의 보강재 없이 휨거동에 대한 저항성을 확보하기 위하여 펄트루젼 방식으로 제작된 FRP를 CFFT 외부에 원주방향으로 부착시킨 FRP-콘크리트 합성말뚝(Hybrid CFFT, HCFFT)을 제안하였다. 이 논문은 HCFFT의 구조적 거동을 검토하기 위한 연구의 일부로서, HCFFT에 사용되는 필라멘트와인딩 FRP의 역학적 특성을 알기 위한 실험을 실시하였다. 또한, 기존 연구 결과를 참조하여 HCFFT의 압축강도를 추정하였으며, 유한요소해석을 통해 얻은 결과와 비교분석하였다. In this paper, new type CFFT (Concrete Filled FRP Tube) was suggested in order to improve the flexural stiffness. Since the existing CFFT was produced by filament winding process, re-bar for concrete may be necessary in order to ensure structural safety under flexure re-bar. In comparison with existing type CFFT, new type CFFT was reinforced by circular shaped pultrusion FRP without re-bar. Filament winding FRP was attached to the outer layer of pultrusion FRP. Structural behavior of new type CFFT filled with concrete (HCFFT) was investigated by the mechanical property test for the component element and the FE analysis. Furthermore, compressive strength of the HCFFT member based on the equation suggested in previous studies.
Enhanced performance of graphene by using gold film for transfer and masking process
최진우,김혜지,박재현,M. Waqas Iqbal,M. Zahir Iqbal,엄종화,정종완 한국물리학회 2014 Current Applied Physics Vol.14 No.8
In this study, we tried to reduce the organic contamination of graphene. This organic contamination most likely occurs during the graphene transfer and lithography steps, which in turn degrades the quality of the graphene. Inorganic Au film was applied for Au-assisted transfer instead of the conventional thin poly(methyl methacrylate), and a new fabrication process using the Au-film for the transfer and masking layer was designed in order to minimize the contamination of graphene from organic residues. As a result, we demonstrated that the overall qualities of the transferred graphene film and graphene transistors have been highly improved. These improvements include an enhancement of mobility, and a decrease of defects, unintentional doping, contact resistance, and sheet resistance.