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강민기,박성준,이윤식 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
γ-Aluminium oxide supported Palladium(II)-N-heterocyclic carbene (Pd-NHC) complex is one of the effective catalyst for Suzuki-Myaura reaction in water dominant environment. NHCs are stable ligands in aqueous conditions so they have been used for spectator ligands of Suzuki-Myaura cross-coupling catalyst. γ-Aluminium oxide, as solid support, is known for its hydrophilicity and structural stability but it has not been fully studied for Suzuki-Myaura reaction. In this research, two kinds of 1-substituted imidazoles were synthesized as precursors of NHCs, and Pd-NHC complexes were prepared using Pd(OAc)2 and these precursors. Finally, the Pd-NHC complexes were immobilized on aluminium oxide. The catalytic activity was tested in various solvents and basic conditions. In conclusion, aluminium oxide supported Pd-NHC catalysts were prepared, characterized and their catalytic activity was observed.
천경자의 예술세계: 전설의 빛깔 - 서울시립미술관 소장품을 중심으로
강민기 미술사학연구회 2016 美術史學報 Vol.- No.S
A legendary painter, Chun Kyung-ja (千鏡子, 1924~2015). Epithets that follow her name, such as ‘The Painter of Light and Sorrow’, ‘The World of Light and Fantasy’, ‘The Painter of Flowers and Women’, ‘The Painter of Flowers and Souls’, ‘Brilliant Grief’, transcend the boundaries of journalism, and are sentiments that she depicted with a sense of a destiny and words that are the essence of her oeuvres. Studies on Chun Kyung-ja, considering her status in modern and contemporary Korean art history and popular recognition, cannot be deemed to be deeply accumulated. This research uses stylistic history analysis, with focus on the 93 representative works donated by Chun Kyung-ja to Seoul Museum of Art. The research, regarding Chun Kyung-ja’s oeuvres, classifies it as: (1) The birth of Chun Kyung-ja, a born painter (1940s to early 50s); (2) A bold attempt to modern Oriental paintings (mid 1950s to 60s); (3) The establishment of Chun Kyung-ja’s style of female form (1970s to early 80s); and (4) The maturity of poetic lyrics (early 1980s to 90s). After receiving pictorial education in Japan during the end of the Japanese Occupation Period and beginning a career as a painter, Chun Kyung-ja became a pioneer who above all others frontiered the issue of modernization of Korean paintings. Until the 60s, she attempted bold and experimental methods to form her first maturity, and later shows second and third maturity and created fatalistic feminine images of splendid sorrow. Where Chun Kyung-ja can be positioned in modern and contemporary Korean art history is believed to be an issue that will be more actively dealt with when her works are more thoroughly researched, discovered, and the research environment for cooperation and publication of works improved. 전설이 된 화가, 천경자(千鏡子, 1924~2015). 그녀의 이름과 함께 따라 다니는 ‘빛과 정한의 화가’, ‘환상의 세계’, ‘꽃과 여인의 화가’, ‘화려한 슬픔’ 등의 수식어는 저널리즘의 영역을 넘어 생전에 그녀가 숙명처럼 그려낸 정서이며, 그의 작품세계를 압축적으로 드러낸 언어들이기도 하다. 천경자에 관한 연구는 한국근현대미술사에서 차지하는 위상과 대중적 인지도를 생각할 때 연구가 깊이 축적되었다고 보기는 어렵다. 본 연구는 천경자가 기증한 서울시립미술관의 소장품 93점을 중심으로 양식사적인 분석을 시도한 것이다. 그녀의 작품세계를 1. 천생화가 천경자의 탄생기(1940년대~50년대 전반) 2. 현대적 동양화로의 대담한 시도(1950년대 중엽~60년대) 3. 천경자 스타일의 여인상 확립(1970년대~80년대 초) 4. 시적(詩的) 서정의 완숙(1980년대 초~90년대)으로 분류했다. 일제 강점기 말에 일본유학을 통해 교육받고, 조선미전을 통해 등단한 천경자는 50년대 중엽부터 한국화의 현대화라는 시대적 과제를 누구보다 적극적으로 개척한 선구자였다. 60년대까지 대담하고 실험적인 기법적 시도를 통해 제1차 성숙기를 이루었고, 이후 제2, 3차 성숙기를 보이며 화려한 슬픔의 미학을 담은 숙명적 여인상들을 그려냈다. 천경자를 한국현대미술사에서 어떤 화가로 위치 지을 수 있는가의 과제는 앞으로 그녀의 작품들이 더 많이 조사 발굴되고, 연구환경이 개선될 때 더 활발하게 이루어질 것이다.
펨토초 레이저 Trepanned Drilling 방식을 이용한 스텐레스 스틸 박판 미세 홀 가공
강민기,안윤준,김태동,이종훈,김현덕,이호 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.2
Stainless steel is known as a corrosion-resistant material and this superior ability could be a desired property for a pinhole aperture operated in a corrosive environment and thereby be able to maintain both smoothness and a perfect circular shape in order to achieve precise beam alignment. Laser drilling has widely been preferred when placing holes into stainless steel due to its non-contact method of machining. In addition, this method is capable of performing delicate machining while inducing relatively low amounts of heat in the affected zone in comparison with other traditional machining techniques such as punching. Laser drilling is also beneficial for specimens having a thin thickness since manufacturing tolerances are minimal in this case. In this paper, we have attempted to produce holes of various diameters in 10 m thick stainless steel foil by using a femtosecond laser trepanned method. We have demonstrated these to be of perfect circular shape and adhering to low tolerance manufacturing by adjusting the beam parameters. In addition, holes with various diameters have been made by employing previously selected machining parameters and the viability of pinhole apertures fabricated by laser drilling have been evaluated.