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Zinc acetate 를 precursor 로 한 고저항 ZnO 막의 제조 및 습도감지 특성
마대영,김상현,김영일 ( T . Y . Ma,S . H . Kim,Y . I . Kim ) 한국센서학회 1996 센서학회지 Vol.5 No.1
ZnO films have been deposited on oxide grown Si wafers by the conventional thermal evaporation method. Anhydrous zinc acetate was directly heated and sublimed in the laboratory-made brass boat. The substrates temperature varied from 200℃ to 600℃. Oxygen has been flowed into the deposition chamber to change the partial pressure of oxygen. The films deposited at high oxygen pressure exhibited higher resistivity than films at low pressure. X-Ray Diffraction(XRD), Energy Dispersive Spectroscopy(EDS) and Rutherford Backscattering Spectrometry RBS) were conducted on the films to reveal the crystallinity and composition of the ZnO films. The ZnO films deposited at high oxygen pressure were extremly sensitive to the humidity of higher than 70 % RH.
윤기봉(K.B.Yoon),마영화(Y.W.Ma),김영일(Y.I.Kim),차석주(S.J.Cha),김윤재(Y.J.Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper the causes and mechanisms of the failure of gas turbine compressor blades were analyzed with finite element analysis and surface inspection. An approximate remaining life assessment was performed by deterministic assessment methods based on the results of fatigue crack growth tests and collected mechanical properties data
허용,이강식,강경훈,유회성,서정일,마성대,Hur, Y.,Lee, K.S.,Kang, K.H.,Yu, H.S.,Suh, J.I.,Ma, S.D. 대한흉부심장혈관외과학회 1988 Journal of Chest Surgery (J Chest Surg) Vol.21 No.4
Esophageal duplication constitute about 10% of all the mediastinal tumor and relatively rare condition. We have experienced one case of esophageal duplication which was found 2 years previously by radiologic study of chest, as mediastinal mass, in 37 years old male. He had neither clinical manifestations nor physical findings leading to the surgical discovery of the duplication. During the last 2 years, the size k location of the mass were stationary in character. Operative therapy of complete excision performed without surgical complication. On microscopic study, the lining cell of inner wall of cyst. Noted pseudostratified ciliated columnar epithelium with smooth muscle.