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ECAP으로 제조된 초미세립 Al-Mg 합금의 동적 변형거동
김양곤(Y.G. Kim),고영건(Y.G. Ko),신동혁(D.H. Shin),이성학(S. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The influence of equal-channel angular pressing(ECAP) route on dynamic deformation behavior of ultra-fine grained Al-4.4% MG alloys was investigated in this study. The 8-pass ECAPed specimens consisted of ultra-fine grains of 0.5 μm in size, and contained the considerable amount of second phase particles, which were fragmented and distributed homogeneously in the matrix. The result of dynamic torsional tests indicated that the maximum shear stress and fracture shear strain were lowest in the specimen deformed by ECAP via route A among the 8-pass ECAPed specimens. The formation of adiabatic shear bands was addressed by concepts of crifical shear strain, deformation energy required for void initiation, and microstructural homogeneity related to ECAP routes.
연구논문 : 보호관찰대상자에 대한 분류평가의 의미와 활용: 소년을 중심으로
김양곤 ( Yang Kon Kim ),이수정 ( Soo Jung Lee ),이민식 ( Min Sik Lee ) 대한범죄학회 2007 한국범죄학 Vol.1 No.1
이 연구는 소년 보호관찰대상자의 분류평가단계에서 보호관찰대상자가 가진 여러 요인을 통해 재범위험성 수준을 분류하고, 보호관찰서비스의 수요자의 필요에 부합하는 처우 서비스가 제공되도록 하기위한 분류평가도구를 제시한다. 분석결과, 본범의 특성, 전과, 초범연령, 친부모와의 동거여부, 월평균가구소득, 부모의 양육태도, 무단결석 여부, 학업에의 의지, 비행 친화적 행동습관, 반사회적 사고나 심리적 불안정 등이 유의미한 예측요인으로 나타났다. 그러나 이 연구의 자료는 보호관찰기간의 현황에 국한되므로, 향후의 연구는 보다 폭넓은 자료를 이용하여 이러한 한계를 극복해야 할 것이다. This study classifies the recidivism-risk levels of juvenile probationers by their characteristics and presents some risk assessment tools to meet the necessities of probation service demanders. In sum, the characteristics of concerned crime, criminal career, age of first offending, living together with parents, mean household income, parents`` attitude of child rearing, truancy, intention of studying, criminogenic habituation, antisocial thinking, and psychological instability were found as significant predictors. The data of the present study, however, are confined within the periods of probation. Therefore, the future studies should overcome such limitations by utilizing some broader time periods of data.
ECAE 전단 가공된 5083 알루미늄 합금의 고변형률 변형거동
김양곤 ( Yang Gon Kim ),고영건 ( Young Gun Ko ),신동혁 ( Dong Hyuk Shin ),이성학 ( Sung Hak Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.7
The high strain rate deformation behavior of ultra-fine grained 5083 aluminum alloys prepared via equal channel angular (ECA) extrusion was investigated in this study. The microstructure of ECA extruded specimens consisted of ultra-fine grains, and contained a considerable amount of second phase particles, which were fragmented and distributed homogeneously in the matrix. According to the dynamic torsion test results, the maximum shear stress and fracture shear strain of the route A (no rotation) specimen were lower than those of route C (180° rotation) specimen since that adiabatic shear bands of 100 μm in width were formed in the route A specimen. The formation of adiabatic shear bands was addressed by concepts of critical shear strain, deformation energy required for void initiation, and microstructural homogeneity associated with ECA operations.