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정석환,권영삼,Chung Suk-Hwan,Kwon Young-Sam 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.5
Crack generation during die compaction and distortion during sintering have been critical problems for the conventional pressing and sintering process. Until now, trial and error approach with engineers' industrial experiences has been only solution to protect the crack generation and distortion. However, with complexity in shape and process it is very difficult to design process conditions without CAE analysis. We developed the exclusive CAE software (PMsolver/Compaction) for die compaction process. The accuracy of PMsolver is verified by comparing the finite element simulation results with experimental results. The simplified procedures to find material properties are proposed and verified with iron based powder and tungsten carbide powder. Based on the accurate simulation result by PMsolver, the optimal process conditions are designed to get uniform density distribution in a powder compact after die compaction process by using a derivative based optimization scheme. In addition, the effect of non-uniform density distribution in a powder compact on distortion during sintering is shown in case of the fabrication of tungsten carbide insert.
증례 : 순환기 ; 경요골 동맥 관상동맥 조영술 시 생긴 이상성 우측 빗장밑 동맥의 합병증 1예
정석환 ( Suk Hwan Chung ),금동성 ( Dong Sung Kum ) 대한내과학회 2011 대한내과학회지 Vol.80 No.2S
우측 요골 동맥을 이용한 관상동맥 조영술은 환자의 편이성 등 여러 가지 장점 때문에 많이 시행되는 술식이다. 그러나 여러 장점에도 불구하고 우측 요골 동맥을 이용한 관상동맥 조영술에 따르는 여러 가지 합병증 역시 있을 수 있다. 이상성 우측 빗장밑 동맥을 가진 환자의 경우 이로 인한 시술상의 어려움, 시술의 실패 등은 잘 알려져 있으나, 시술 후에 생긴 우측 빗장밑 동맥 박리는 많이 알려져 있지 않다. 본 증례는 흔하지 않은 합병증을 경험했기에 이에 대한 증례 보고를 하는 바이다. Right transradial coronary catheterization is very popular and performed by many clinicians with few complications. An aberrant right subclavian artery (arteria lusoria) arising from the descending thoracic aorta is an uncommon congenital variant. Here, we present the case of a patient with an aberrant right subclavian artery dissection after right transradial coronary catheterization, which is a rare complication. We diagnosed the complication by chest CT, which showed the dissection of the aberrant right subclavian artery. Dissection of an aberrant right subclavian artery is a rare complication of right transradial coronary angiograph. (Korean J Med 2011;80:S157-S160)
정석환(Chung Suk-Hwan) 한국교육철학회 2003 교육철학 Vol.24 No.-
The purpose of this thesis is to examine Lyotard's Postmodern theory of knowledge and its meanings in education. Specifically, the examination focused on The Critic of Performative Knowledge base on Lyotard's Postmodern theory of knowledge Conclusions are as follows. The result of the decline of meta narratives that have functioned as bases for the legitimation of knowledge, Lyotard argues, will step into the dominance of the performativity criterion. The power of technology dominating contemporary society has degraded reason into instrumental one and produced performativity standard as a meta narrative. Knowledge under performativity principle circulates not in its educational values and political importance, but in the same way as currency does, so the criteria judging the value of knowledge can be found in 'outgo knowledge' and 'investment knowledge, not in 'knowing' or 'not knowing'. For example, in the field of education the induction of training and technology according with the system's performance becomes more valuable. But the ascendancy of performativity underestimates a person's freedom and value independent of system. Lyotard criticizes every metanarratives, like system theory operating under this performativity principle in that it entails a kind of terror to make the incommensurable commensurable. To fight successfully against the terror of metanarratives Lyotard introduces a form of legitimation grounded on paralogy. Paralogy is a sphere that philosopher embodies the logic of dissent, not one that expert pursues consensus. In other words, it encourages new moves and possibilities of other purposes within one system. Also, not excluding other voices, it accepts the possibility of various utterances and strengthens patience to tolerate difference. The delegitimation by the logic of paralogy is necessarily tied to the possibility of knowledge based on difference. Lyotard's theory of knowledge is grounded upon a tolerance to difference. Here difference is justified by different modes of utterences existing among rules inherent modes of discourses. Thus, Lyotard's postmodern theory of knowledge presents knowledge of difference and aims at showing the differences, and suggests a man accepting them as they are with tolerance.