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김덕환(Kim, Duckwhan) 조선대학교 민주평화연구원 2020 민주평화연구 Vol.3 No.2
1‧8 Resistance, happening in Chosun University in Gwangju for the 113 days up to 8 January, 1988, is regarded as a representative university democratization movement in Korea. This paper aims to observe the background, the process, and the result of 1‧8 Resistance and discuss the meaning and value of the time. I introduce the anti-democratic acts that President Park Cheolwoong of Chosun University of the time as a background of this accident and then its process based on the historical record of 50 years of Chosun University. The conclusion evaluates the meaning of 1‧8 Resistance and emphasizes its continuous value beyond a mere accident taking place 32 years ago, which teaches that a private university should not belong to a certain foundation, but the whole body of professors, personnel, students, and citizens.
차량 안정성 관련 Fe-Mn-Si-C계 TRIP형 복합조직강의 화학조성에 따른 인장특성
이기열(Kiyeol Lee),김덕환(Duckwhan Kim),김재철(Jaechul Kim),심주현(Joohyun Shim),황종원(Jongwon Hwang),백일기(Ilki Baik) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effect of chemical compositon on the microstructural change and tensile property in TRIP-assisted steels with different chemical composition was investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be identified as two types : a granular type in a steel containing higher Si and a film type in a steel having higher C. For the case of higher C-containing steel with a tensile strength of 860 ㎫ and a total elongation of 38%, film-typed retained austenite could be observed between lath bainitic ferrite. Actually, metastable retained austenite was a requisite for the good formability, which means that chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steels. With respect to tensile property, the steels containing suitable Si and Mn, respectively, showed a typical TRIP effect in stress-strain curve, while a steel containing higher Mn content exhibited the as similar behavior shown in dual phase steel.