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TiC 피복초경공구위에 화학증착에 의한 AI₂O₃의 내마모피복에 관한 연구
진억용 亞洲大學校 1988 論文集 Vol.11 No.-
Aluminium oxide (Al₂O₃) was deposited onto TiC coated tools by means of chemical vapour deposition (CVD) using AlCl₃, CO₂and H₂gas mixture. In order to compare the wear rate of TiC-Al₂O₃coated cutting tools with that of TiC coated cutting tools, wear test was carried out varying with cutting velocity. The effects of deposition paramenter and cutting velocity on the frank wear rate were investigated The experimental results were as follows; i) The deposition rate remained constant with deposition time. ii) It is postulated that the deposition rate below 1000℃ was controlled by surface reaction. iii) As cutting velocity increased, the frank wear rate of TiC-Al₂O₃coated cutting tools markely decreased against that of TiC coated cutting tools.
화학 증착법(CVD)에 의한 고속도강 위에 TiN의 피복에 관한 연구
황의규,진억용 亞洲大學校 1988 論文集 Vol.11 No.-
Titanium nitride(TiN) coatings were deposited on a High-Speed-Steel(SKH9) substrate by chemical vaper deposition(CVD) using the TiCl₄, H₂, and N₂gas mixtures. The effect of the deposition temperature, the H₂/N₂input ratio, the TiCl₄partial pressure, and the deposition time on the deposition rate, the surface morphology and microhardness of the TiN coatings were investigated The experimental results indicate that the deposition rate is increased almost linearly with an increase in the deposition temperature and the partial pressure of TiCl₄. The grain size of the TiN coatings is increased with an increase in the deposition temperature and the H₂/N₂ratio, But that of the TiN coatings is reduced with an increase in the TiCl₄partial pressure. When the deposition temperature is lower than 1000℃, the TiN deposition reaction is controlled by the surface reaction. At the temperature above 1000℃ the reaction is controlled by the mass transport. The apparrent activation energies are 8.6kcal/mole and 21.8kcal/mole respectively. The microhardness has close relation with the surface morphology and stoichiometric ranges of TiN coatings.
신근하,진억용 亞洲大學校 1983 論文集 Vol.6 No.-
In order to study the fatigue properties of welded materials, the structual steel plates were welded by submarged are welding and annealed at 600, 700 and 900℃ for releasing of residual stresses. The obtained results are summarized as follows; 1. The fatigue limit of welded steel annealed at 800℃ had shown the largest value among those of the other temperatures. 2. The endurance ratio of thewelded steel which was stress-relieved at 800℃ had the highest value. 3. The fatigue crack propagation rate of welded steel annealed at 800℃ was slower than those annealed at the other temperatures.
Generalization of Vacuum and Parity-odd Domain Structure
Eog Man Kim,이수경,Eun-Joo Kim,최종범 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.9
Heavy ion experiments have shown the possibility of creating parity-odd domains related to thenontrivial solution of quantum chromodynamic (QCD) vacuum known as the vacuum. In theparity-odd domains, the value of is taken to be a function depending on spacetime coordinates. The spacetime dependence of can be transferred into that of gluon condensates, and we caninterprete this result as a change in the viewpoints on the definition of the QCD vacuum. In thispaper, we suggest a method to generalize the vacuum by exploiting the dimension-2 condensatesand to calculate the parity-odd domain structure formed by 9 quarks as the union of gauge slicesdefined by the constant value of the dimension-2 condensate.
김억만 ( Eog Man Kim ),이수경 ( Su Kyoung Lee ),김은주 ( Eun Joo Kim ),최종범 ( Jong Bum Choi ) 전북대학교 과학교육연구소 2013 과학과 과학교육 논문지 Vol.38 No.2
최근의 힉스 입자 발견은 공기, 시간, 질량과 같은 자연 법칙을 이해하기 위한 논리적 출발점에 대해 다양한 질문을 유발시키고 있다. 이들 중에서 질량은 사물의 존재와 밀접히 관련된 개념이지만, 이제 존재문제는 진공에 대해 요동하는 힉스 장에 관한 질문으로 바뀌는 양상이다. 실제로는 관측되는 원자 질량의 98%가 질량이 없는 글루온으로부터 생성되므로 글루온과 원자와의 관계는 원자를 구성하는 원자핵 속의 강입자 주위의 진공 정의와 직접 닿아 있다. 본 논문에서는 전공 개념의 변화를 되돌아보고, 고전적으로 형성된 질량 개념과 관련하여 어떠한 의미가 있는지 논의하고자 한다. Recent confirmation of Higgs particle generates various questions about our logical starting points to understand the laws of nature such as space, time and mass. Of these, the mass is taken to be the concept closely related to the problem of existence, however, now the existence problem seems to be moved to the question of fluctuating Higgs fields with respect to the vacuum. In fact, 98% of the observed masses atoms originate from massless gluons and the relations between the massless gluons and the massive atoms are intimately connected to the definition of vacuum around hadron composing the nuclei of atoms. In this paper, we will review the changes of vacuum concept and discuss the meanings related to our classically established mass concept.