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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.
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.
IT거버넌스 실행요인과 정보시스템(IS) 효과성, 그리고 전략적 연계의 조절효과
최상민 ( Sang Min Choi ),문태수 ( Tae Soo Moon ) 한국정보시스템학회 2011 情報시스템硏究 Vol.20 No.2
IT governance is an integral part of enterprise governance and consists of the leadership, organizational structures, and processes that ensure organization`s IT decision making for achieving organizational goal. Most firms have failed to resolve the balance in building IT governance. The challenge is to align IT strategy with business strategy in establishing and implementing effective IT governance. The purpose of this study is to find out the relationship between IT governance implementation factors and IS effectiveness, and the moderating effect of strategic alignment of IS strategy with business strategy on IS effectiveness. IT governance implementation factors consist of IT vendor management, IT human resource management, and IT infrastructure. Strategic alignment was measured as the alignment between business strategic orientation and IS strategic orientation that used in the research of Chan et al.(1997). In the relationship between three IT governance implementation factors and IS effectiveness, the results of multiple regression analyses showed that IT human resource management is an important determinant to influence IS effectiveness. The additional analysis using multiple regression showed that strategic alignment of IS strategy with business strategy has moderated the relationship between IT governance implementation factors and IS effectiveness.
최상민(Sang Min Choi) 조선대학교 교과교육연구소 2007 敎科敎育硏究 Vol.28 No.1
This writing is for the purpose of searching for the methodological implication of discourse writing teaching. For this, first of all, I reflected the actual condition of the spot. As a result, the most efficient method of being ready for the combined discourse is taking a basic textbook as all courses of highschool textbook and reading various texts which are related with them, discussing it, I confirmed of requiring connection studying of the way in adapting this in the daily lives naturally. For this, I empathized that reading practice and writing practice must go side by side. Especially, I empathized that reading teaching needed for 2texts that was reflected a spiral pattern curriculum principle. Next, I suggested the method in my own way, illustrating practical examples of discourse teaching. Here I empathized that the differentiation of curriculum needed to be made in substance, following students personality various characteristic over the differentiation of curriculum in the center of the real teaching examples
100 MWe 순산소 석탄연소 발전시스템의 개념설계-영동 프로젝트
최상민(Sangmin Choi) 한국연소학회 2012 한국연소학회지 Vol.17 No.3
An existing unit of power plant is considered to refurbish it for possible application of carbon capture and storage(CCS). Conceptual design of the plant includes basic considerations on the national and international situation of energy use, environmental concerns, required budget, and time schedule as well as the engineering concept of the plant. While major equipment of the recently upgraded power plant is going to be reused, a new boiler for air-oxy fired dual mode operation is to be designed. Cryogenic air separation unit is considered for optimized capacity, and combustion system accommodates flue gas recirculation with multiple cleaning and humidity removal units. The flue gas is purified for carbon dioxide separation and treatment. This paper presents the background of the project, participants, and industrial background. Proposed concept of the plant operation is discussed for the possible considerations on the engineering designs.
KDX-II급 함정 수직발사대 선체 균열발생에 따른 보강방안 연구
최상민 ( Sang-min Choi ),최준호 ( Jun-ho Choi ) 한국품질경영학회 2017 품질경영학회지 Vol.45 No.3
Purpose: The purpose of this study is to propose retrofit measures for KDX-II KVLS hull crack, also, enhance safety and quality of ship. Also, this study suggest to how to retrofit about hull crack of the ship and how to improve operability of the ship. Methods: Retrofit measures of KDX-II KVLS hull crack reach a conclusion through global structure analysis and fatigue analysis. Concerned about thermal deformation due to welding around the KVLS, in addition to, verify to safety of KVLS. Results: Based on result of global structure analysis establish retrofit measures for KDX-II KVLS hull crack. Additionally, through fatigue analysis establish final retrofit measures. The results of retrofit measures are allowed both stress level and fatigue life. Conclusion: Retrofit measures for ship hull crack based on global structure analysis and fatigue analysis improves operability and quality of the ship. Especially, KDX-II ship is the best battleship in our country. Considering the importance of KDX-II, this study improves both Korea navy’s combat power and ability to carry out the mission.
IT역량과 조직성과의 영향관계에서 IS 전략적 활용의 매개효과분석
최상민 ( Sang Min Choi ),문태수 ( Tae Soo Moon ) 한국정보시스템학회 2014 情報시스템硏究 Vol.23 No.2
Today, the company is trying to improve for business performance through the optimization of corporate resources. Most companies set up new strategy for obtaining competitive advantage for survival in rapid changes of the global business environment. IT has an important role to reduce cost and to increases business performance such as increasing sales, improving business skills and corporate image, etc. in the corporate environment. The development and use of IT resource is recognized as essential in connection with the business strategy. Most companies tried to establish the strategic use of information systems to gain competitive advantage. IT resource management is not clear in a tangible result of the business. The purpose of this study is to find out the relationship between IT competency and organizational performance through the mediating effect of strategic use of IS. IT competency consists of IT human resource, IT infrastructure, and IT vendor management. In direct relationship between three IT competence factors and organizational performance, the results of multiple regression analysis showed that IT human resource and IT vendor management are important determinants to influence organizational performance. The additional analysis for mediating effect of strategic use of IS showed that it has mediated the relationship between IT competency factors and organizational performance. This results give us an implication, not only the importance of IT competency development, but also the importance of strategic alignment of strategic use of IS with business strategy.