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연소합성 TiO<sub>2</sub> 나노입자의 고온 상변환 특성에 관한 연구
최상민,이교우,Choi, Shang-Min,Lee, Gyo-Woo 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.3
In this article, $TiO_2$ nanoparticles were synthesized by using $O_2$-enriched coflow, hydrogen, diffusion flames. We investigated the thermal stability of the flame-synthesized $TiO_2$ nanoparticles by examining the crystalline structures of the nanoparticles. Also, the results were compared with those of commercial P-25 nanoparticles. $TiO_2$ nanoparticles, which were spherical with diameters approximately ranging from 30 to 60nm, were synthesized. From the XRD analyses, about 96wt% of the synthesized nanoparticles were anatase-phase. After the heat-treatment at $800^{\circ}C$ for 30 minutes, the synthesized $TiO_2$ nanoparticles showed no significant changes of their shapes and crystalline phases. On the other hand, most of the commercial particles sintered with each other and changed to the rutile-phase. Based on the result of XRD analysis it is believed that the flame-synthesized $TiO_2$ nanoparticles have higher thermal stability at $800^{\circ}C$ than the commercial particles.
오스테나이트계 고망간강에서 인장 특성과 피로거동에 미치는 변형유기상의 영향
최상민,권숙인 ( S . M . Choi,S . i . Kwun ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.4
The effect of grain size on the tensile properties and fatigue behavior of austenitic high Mn steel has been investigated. The recrystallized austenite grain size of the cold rolled high Mn steel was increased as the annealing temperature increased from 600℃ to 1000℃. Larger austenite grain size decreased the yield strength and the tensile strength, and increased the uniform elongation due to transformation of some austenite into twins or ε-martensite phase during deformation. Austenite grain refinement increased the tendency to form dislocation cells, instead. The specimen annealed at 1000℃ with large grain size showed lower fatigue crack propagation rate in low ΔK region due to rougher fracture surface caused by formation of deformation twins during fatigue at the crack tip region.
캐비테이션 발생에 따른 해군 수상함정 방청도료(EH 2350) 적합성 검증에 관한 연구
최상민(Sang-Min Choi),이지혁(Ji-Hyeog Lee),백용관(Yong-Kawn Beak),정현섭(Seob-Hyeon Jeong) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.5
군의 수상함정은 다수 해역에서 작전 업무 수행을 실시하며, 부식이 되기 쉬운 가혹한 환경에 노출되어 있다. 해군 운용 함정들은 부식을 방지하기 위하여 여러 가지 방법의 방식 기술을 적용하고 있으나, 캐비테이션에 의한 선저구조물에 부식 및 손상이 지속적으로 발생한다. 선체의 부식은 함 작전운용성능 저하 및 함 수명에 직접적인 영향을 미칠 수 있는 요소로서 함정 선체의 방식은 반드시 필요하다. 본 연구에서는 해군에서 운용중인 함형별로 사용하는 방청도료 자료를 수집 및 분석하여, 그 중 주 방청도료로 사용하고 있는 EH 2350과 미 해군에서 선저 구조물 보호를 위하여 사용하고 있는 특수도료인 금속보수제 DuraTough DL과 특성 비교 및 내마모성 시험을 통해 적합성 검증을 실시하였다. 객관적인 검증을 위하여 함이 해수 환경에 노출된 것으로 고려하여 마모 cycle과 마모 하중 조건을 다수 설정하여 검증을 실시하였다. 본 연구를 통하여 해군 수상함정에 일반적으로 적용되는 방청도료(EH 2350)의 적합성에 대한 신뢰성을 확보할 수 있을 것이다. The naval surface vessels, which were often exposed to harsh marine environment, tended to be corrosive due to military operations on various sea-areas and courses. Although R.O.K Navy applied various methods to protect further corrosion, the hull corrosion occurred due to cavitation were found on the naval surface vessels at regular and occasional docking. Hull corrosion was a critical factor directly to affect the lifetime of ships and their operational capabilities adversely. In this paper, EH 2350, which was the main anticorrosion paint used by R.O.K. Navy, was compared with DuraTough DL by used by the U.S Navy to collect materials related to anti-corrosion paint. In addition, the paint compatibility verification was conducted through wear abrasion test. Assuming that it was exposed to sea-environment various both abrasion cycle and weight for objective verification. by varying both the abrasion cycles and weights. In this study, the reliability of the EH 2350 conformity, which was used in Naval surface vessels, was secured.
모바일결제서비스의 시스템품질 특성이 이용자 저항의도에 미치는 영향
최상민 ( Choi Sangmin ),송광석 ( Song Gwangsuk ) 한국품질경영학회 2018 품질경영학회지 Vol.46 No.3
Purpose: The scale of a market of mobile payment which was insignificant is explosively being improved by development of various communications technology and achieving rapid diffusion of smart phone. According to this phenomenon, new method of financial dealings through a mobile can be seen as a new paradigm that leads to a change of existing payment work and also recognized as an innovation of information technology. Methods: but a study regarding whether the use of mobile payment service takes an important role as an influencial factor is still insufficient. This study was based on the model of innovation resistance by Ram(1987) and established a hypothesis and a model to confirm how four factors (usability, security, economic feasibility, responsiveness) influence to innovation resistance and the intention of discontinuous use. Results: usability, security were found to be significant predictor variables of innovation resistance to use mobile payment system, but economic feasibility, responsiveness were not found to be significant predictor variables. Conclusion: Providing gave a theoretical foundation for future research in that it presents the variables to consider new forms of mobile payment services, the mobile payment services will need to show a differentiated strategy and traditional marketing strategy.
최상민(Choi Sangmin) 한국문화융합학회 2021 문화와 융합 Vol.43 No.11
본고는 ‘분단/통일’문제를 다룬 오태영의 작품들을 연구 대상으로 한다. 구체적으로 <통일 익스프레스>(1998),<돼지비계>(2000), <불타는 소파>(2001), <콩가루>(2002) 등이다. 연구의 중점은 이 작품들의 재현 전략과 그 의미이다. 구체적인 연구주제는 다음과 같다. 첫째, 작품의 구조상의 특징이다. 연구 대상작들은 대개 ‘이중적인 구조’를 지니고 있다. 그것은 ‘우스꽝스러운 겉’과 ‘진지한 속’이라는 형식으로 나뉜다. 이는 이들 희곡들이 보여주는중요한 재현 전략 가운데 하나이다. 둘째, 폭발적으로 드러나는 ‘육체언어’이다. 이를 그의 작품들에서 숨겨진 ‘담론의 진실’을 드러내려는 재현 전략이라고 보았다. 육체언어는 이성의 차원에서 차분히 설명하고, 설득하려는 의도를 갖지 않는다. 대신 정곡을 찌르는 일격으로 기성 질서의 세계가 요구하는 이성적 담론의 무용함을 드러내는 가장 효과적인 전략이다. 그의 이런 재현 전략들은 재현 불가능성을 우회하기 위한 방법적 선택이었다. 동시에 당대 사조상의 변화상과연동되어 있기도 하다. 그러나 오태영의 재현 전략은 종종 ‘팸플릿의 언어들’과 뒤섞임으로써 스스로의 한계를 노정한다는 비판도 가능하다. 본 연구가 관련 연구에 하나의 방법적 시사점을 제공할 수 있을 것으로 기대한다. This study focuses on Oh Tae-young’s plays that dealt with the issue of division/unification. Specifically, <Unification Express>(1998), <DWAEJI- BIGEYE>(2000), <Hot Sofa>(2001), <Bean Flour>(2002) etc. The focus of the study is the representational strategy and its meaning of these plays. Specific research topics are as follows. First, the structural characteristics of the work. Target works usually have a ‘dual structure’. The grand prize works are divided into the form of ‘a funny face’ and a ‘serious inside’. This isone of the important representational strategies shown in these plays. Second, ‘Sub language’ is revealed explosively. This is a representation strategy to reveal the‘truth of discourse’ hidden in his works. ‘Sub language’ calmly explains at the level of reasonand does not intend to persuade. Instead, it is the most effective strategy to reveal the futility ofrational discourse demanded by the world of established order with a piercing blow. His representational strategies were a methodical choice to circumvent the impossibility ofrepresentation. At the same time, it is also linked with the changing image of the contemporarythought. However, it is also possible to criticize Oh Tae-young’s representational strategy for exposingits own limitations by often mixing it with the ‘languages of pamphlets’. It is expected that this study can provide a methodological implication for related studies.