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산화물과 질산염으로 제조한 투명전극 타깃용 다성분계 IGZO 세라믹스
이현권,윤지혜,조경식,Lee, Hyun-Kwun,Yoon, Ji-Hye,Cho, Kyeong-Sik 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.5
Homogeneous multicomponent indium gallium zinc oxide (IGZO) ceramics for transparent electrode targets are prepared from the oxides and nitrates as the source materials, and their properties are characterized. The selected compositions were $In_2O_3:Ga_2O_3:ZnO$ = 1:1:2, 1:1:6, and 1:1:12 in mole ratio based on oxide. As revealed by X-ray diffraction analysis, calcination of the selected oxide or nitrides at $1200^{\circ}C$ results in the formation of $InGaZnO_4$, $InGaZn_3O_6$, and $InGaZn_5O_8$ phases. The 1:1:2, 1:1:6, and 1:1:12 oxide samples pressed in the form of discs exhibit relative densities of 96.9, 93.2, and 84.1%, respectively, after sintering at $1450^{\circ}C$ for 12 h. The $InGaZn_3O_6$ ceramics prepared from the oxide or nitrate batches comprise large grains and exhibit homogeneous elemental distribution. Under optimized conditions, IGZO multicomponent ceramics with controlled phases, high densities, and homogeneous microstructures (grain and elemental distribution) are obtained.
기계적 합금화 및 스파크 플라즈마 소결에 의해 제조된 Al-Fe-X계 합금의 열적 안정성: II. Al-Fe-Cr and Al-Fe-Mo
이현권,이상우,조경식,Lee, Hyun-Kwuon,Lee, Sang-Woo,Cho, Kyeong-Sik 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.1
Mechanical alloying using high-energy ball mill and subsequent spark plasma sintering (SPS) process was applied to Al-Fe-Cr and Al-Fe-Mo powder mixture to investigate effects of Cr and Mo addition on thermal stability of Al-Fe, and thereby to enhance its thermal stability up to $500^{\circC}$. Various analytical techniques including micro-Vickers hardness test, SEM, TEM, X-ray diffractometry and corrosion test were carried out. It was found that addition of Cr and Mo to Al-Fe system played a role of grain growth inhibitor of matrix Al and some precipitates such as $Al_3Fe$ during SPS and subsequent heat treatment. The inhibition of grain growth resulted in increased Vickers hardness and thermal stability up to $500^{\circC}$ comparing to those of Al-Fe alloy system.
무의식적 관점에서 본 화가 프랜시스 베이컨에 대한 예비적 연구
이현권 한국정신분석학회 2019 精神分析 (Psychoanalysis) Vol.30 No.2
This preliminary study aimed at informing the beginning of the following series of theses. Francis Bacon is a painter representing not only Britain, but also the history of art in the 20th century. Thus, many books explain about his works, however, his ‘abstruse fear’ and his position in the history of art style have not been sufficiently explained. This preliminary study argued that the unconsciousness we experience all the time in clinical practices could explain about the painter’s unidentified parts to a certain degree. Also, through analysis on the painter, this study examined the possibilities to explain the perspectives of the unconsciousness through the history of art styles. This study briefly discussed how his superego could transform and how it was connected to his life by looking over a few of his artworks. Through such a process, this study concluded that the perspective of the unconsciousness takes a very important position in understanding Bacon’s works. This preliminary study informing the beginning of the analysis on many of other painters, and it will identify how the unconsciousness could be expressed in the paintings under the influences of the era.
이현권,유재학 한국정신분석학회 2011 精神分析 (Psychoanalysis) Vol.22 No.1
Technological and artistic advancements spurred by the invention of cameras have made photography important in our daily lives and in the area of modern art. Based on reviews of some articles and books, this report studies the relationship between photography and psychoanalysis. In psychoanalysis, photography and cameras could be understood as something that give some conscious and unconscious satisfaction by combining voyeuristic and exhibitionistic desires with one’s aggressive aspect. Strong appeal of photography may come from its characteristic ability to gratify various levels of unconscious wishes. In addition, this article explains that the photography and cameras have close relationships with some ego functions, namely object constancy, reality definition,etc. Especially, the photography seems to function like a psychic apparatus between unconscious wishes and the reality. Such a psychoanalytic view may give new understanding of photography.
이현권,조경식,김미영,Lee, Hyun-Kwuon,Cho, Kyeong-Sik,Kim, Mi-Young 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.4
Need for plasma resistant ceramic materials has been continuously increased in semiconductor and display industry requiring plasma processing to realize ultra fine circuit process. Among promising candidates, alumina ceramics have still some advantages with respect to its economic aspect. In this study, fabrication of plasma resistant alumina ceramics was tried, and its processing optimization was also aimed. Careful processing control and thereby uniform microstructure of $Al_2O_3$ gave rise to enhanced plasma resistance, even comparable to market-governing commercial $Al_2O_3$. A further study is needed concerning ${\beta}-Al_2O_3$ materials system, presumably playing a decisive role in decreasing plasma resistance of $Al_2O_3$ ceramics.