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DC 스퍼터법과 유도결합 플라즈마를 이용한 마그네트론 스퍼터링으로 제작된 나노결정질 TiAlN 코팅막의 물성 비교 연구
전성용,김세철,Chun, Sung-Yong,Kim, Se-Chul 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5
Nanocrystalline TiAlN coatings were prepared by reactively sputtering TiAl metal target with $N_2$ gas. This was done using a magnetron sputtering system operated in DC and ICP (inductively coupled plasma) conditions at various power levels. The effect of ICP power (from 0 to 300 W) on the coating microstructure, corrosion and mechanical properties were systematically investigated using FE-SEM, AFM and nanoindentation. The results show that ICP power has a significant influence on coating microstructure and mechanical properties of TiAlN coatings. With increasing ICP power, the coating microstructure evolved from the columnar structure typical of DC sputtering processes to a highly dense one. Average grain size of TiAlN coatings decreased from 15.6 to 5.9 nm with increasing ICP power. The maximum nano-hardness (67.9 GPa) was obtained for the coatings deposited at 300 W of ICP power. The smoothest surface morphology (Ra roughness 5.1 nm) was obtained for the TiAlN coating sputtered at 300 W ICP power.
정계정맥류환자에서 내정계정맥의 Cortisol, Catecholamine은 정자형성장애와 관련이 있는가?
조명관,김현우,김세철,Cho, Myong-Kwan,Kim, Hyun-Woo,Kim, Se-Chul 대한생식의학회 1991 Clinical and Experimental Reproductive Medicine Vol.18 No.2
Cortisol, epinephrine and norepinephrine concentration in the antecubital and internal spermatic vein were measured and compared each other in 22 varicocele patients to investigate a possible toxic role of these materials to cause impairment of the spermatogensis. The results were as follow. 1) There were no significant differences of cortisol, epinephrine and norepinephrine concentrations between in the internal spermatic vein and in the peripheral vein, 2) Also in 6 patients who showed the abnormal findings on semen analysis and 7 patients who showed the impaired spermatogenesis on testicular biopsy, no significant differences of cortisol epinephrine and norepinephrine concentration were found between in the peripheral vein and in the internal spermatic vein. Therefore, cortisol, epinephrine and norephrine are not regarded as toxic materials responsible for the impairment of spermatogenesis in varicocele.