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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.
간재(艮齋) 전우(田愚)의 「독논어(讀論語)」를 통해 본 도의(道義)의 의미 연구
길태은 ( Gil Tae-eun ) 한국공자학회 2021 공자학 Vol.43 No.-
이 연구는 『논어』를 통해 본 도의의 의미를 간재 중심으로 고찰한 글이다. 이에 「독논어」의 주요 견해를 확인해 보고, 간재생애에 있어서 도학적 의리정신과 교학적 자정의 의미를 『논어』에서 탐색하고자 한다. 19세기 중반 이후에 활동했던 간재는 외세의 침략과 그들의 문화에 대해 심각한 도전의식을 가지고 있었다. 간재는 「독논어」에서 ‘학이시습’의 ‘학’자를 주석함에 ‘심이성을 배워야 한다.’는 심학성을 바른 학문으로 인식했다. 만일 존심(尊心)으로 해석하면 바로 광자나 방자한 사람이 될 수 있다고 하여 심이 도의를 따라야 함을 주장한다. 그렇기에 간재의 문제 의식은 ‘선악을 실행할 수 있는 심이 어떻게 하면 순선한 본성에 근본 할까’가 무엇보다 중요한 문제가 된다. 곧 인간의 본성에 근본 하는 윤리실천 주체의 확립을 통해 심이 도의[性理]를 실천하는 것이 선비정신이며 도학정신임을 주장한다. 간재의 교학적 자정의식 속에서 교학과 저술활동은 공자가 제시한 ‘천하에 도가 있으면 나타나 행동하고, 천하에 도가 없으면 물러나 숨는다.’는 도의 구현방법에 충실한 것이었다. 이러한 간재의 삶과 경학 태도를 보면 존성을 중시한 도의에 바탕을 두고 있음을 살필 수 있는데, 당시 국가사회의 부조리와 왜양의 침탈은 모두 인간의 심기를 밝히지 않았기 때문이라고 여긴다. 간재가 망국이라는 극악의 모순을 목도하며 일제강점의 불합리를 겪어야 했던 시기를 비취어 볼 때 그의 현실대응에 대한 문제의식을 살필 수 있다. This study is a study that examines the meaning of Taoist righteousness through “The Analects of Confucius” with the center of Ganjae. The study scans the major perspectives in “The Reading of The Analects of Confucius” (「讀論語」) and explores The Analects of Confucius for what the Taoist commitment to loyalty and self-purification through teaching and learning meant to Ganjae’s life. Active in his scholarly pursuits from the latter half of the 19th century, Ganjae harbored a serious commitment to contesting aggressions from foreign forces and their cultures. In commenting on “learn” in “Is it not pleasant to learn with a constant perseverance and application?” (from The Analects of Confucius) in his “The Reading of The Analects of Confucius,” Ganjae viewed Simhakseong (心學性), meaning “the mind should learn the heart,” as the correct type of scholarship. Cautioning that a person who construes the word as “upholding the mind (尊心)” may instantly be turned into a madman or an arrogant person, he insisted that the mind must conform to Taoist righteousness. In Ganjae’s critical mind, the paramount question is “how can a mind that can perform good and evil serve as the foundation of a pure and good nature?” In other words, Ganjae suggests that a mind practicing the Neo-Confucian philosophy on nature and principle creates the gentleman-scholar's spirit as well as the Taoist spirit. The teaching and learning and writing as committed to Ganjae’s self-purification through teaching and learning remained faithful to what Confucius presented as the way to realize the truth when he said, “When right principles of government prevail in the kingdom, he will show himself; when they are prostrated, he will keep concealed” Ganjae’s attitude in the study of Confucian classics was obviously grounded in the Taoist righteousness that lay great store on the upholding of the heart, which reflected the scholar’s criticism that the contemporary political and society-wide irregularities as well as the aggressions from Japan and the Western powers all resulted from a failure to shed light on the minds and energy of humans. Paying attention to the time period when Ganjae had to witness an extreme contradiction, the fall of the kingdom, and suffer the irrationality of the Japanese Occupation, one can understand the scholar’s critical mind regarding how to cope with his reality.
조성우(S.W.Cho),최상민(S.M.Choi),배충식(C.S.Bae),노석홍(S.H.Noh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Measurement tecliniques were developed to quantify the instantaneous piston assembly friction force and the oil film thickness between the piston rings and the cylinder liner. That can be easily applied to small multi-cylinder production engine. The friction force and oil film thickness data were acquired under various operation conditions and for various oils in an SI four cylinder engine. In this study, friction force data were found to be more reliable in consequence of proper compensation. It was possible to measure oil film thickness on thin oil ring rails as well as compression rings. The results revealed that mixed lubrication is dominant in limited operating conditions where product of kinematic viscosity and mean piston speed is lower than 80xl0^-6m³/s2.<br/>
함정 탑재장비용 능동 하이브리드 마운트 개발에 대한 연구
문석준(Moon, S.J.),최상민(Choi, S.M.),정종안(Jeong, J.A.),최승복(Choi, S.B.),정우진(Jung, W.J.),구자용(Koo, J.Y.) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.7
A hybrid mount for shipboard machinery installed on naval ships was developed. The mount is combined with a rubber mount and a piezostack actuator. The rubber mount is one of the most popular and effective passive mounts to have been applied to various vibration systems to date. The piezostack actuator is featured by a fast response time, small displacement and low power consumption. Through a series of experimental tests conducted in accordance with MIL-M-17185A(SHIPS), MIL-M-17508F(SH), and MIL-S-901D which are US military specifications related to the performance requirements of the mount, it has been confirmed that the hybrid mount shows more effective performance for use in naval ships.
2-유체 분사기를 포트분사에 적용한 SI 엔진의 성능에 관한 실험적 연구
강진석(J.S.Kang),김승수(S.S.Kim),최상민(S.M.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The effect of port injected small fuel droplets which were generated by a 2-phase Injector (Air-Assisted Fuel Injector. AAFI) was evaluated for several different conditions of engine operation. The experimental results were compared with those of conventional MPI (Multi-Point Injector). When the deflector was not used. AAFI produced fuel droplets on the order of 20.0 μm Sauter Mean Diameter (SMD). With deflector which restricts the initial spray angle to 60° , SMD of AAFI was 32.8 μm and the fuel spray injected from MPI showed 132.6 μm SMD. AAFI reduced HC emission especially during cold condition in comparison to MPI at ECU (Electronic Control Unit) controlled fuel injection timing. AAFI also represented consistency of HC emission over various fuel injection timing, including intake-valve open period. AAFI is considered to be very advantageous for transient condition.<br/>