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사파이어 기판에 펄스 레이저 증착법으로 성장된 AlN 박막의 특성
정은희,정준기,정래영,김성진,박상엽,Jeong, Eun-Hee,Chung, Jun-Ki,Jung, Rae-Young,Kim, Sung-Jin,Park, Sang-Yeup 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6
AlN films with c-axis orientation and thermal conductivity characteristics were deposited by using Pulsed Laser Deposition and the films were characterized by changing the deposition conditions. In particular, we investigated the optimal conditions for the application of a heat sinking plane AlN thin film. Epitaxial AlN films were deposited on sapphire ($c-Al_2O_3$) single crystals by pulsed laser deposition (PLD) with an AlN target. AlN films were deposited at a fixed pressure of $2{\times}10^{-5}$ Torr, while the substrate temperature was varied from 500 to $700^{\circ}C$. According to the experimental results of the growth temperature of the thin film, AlN thin films were confirmed with a highly c-axis orientation, maximum grain size, and high thermal conductivity at $650^{\circ}C$. The thermal conductivity of the AlN thin film was found to increase compared to bulk AlN near the band gap value of 6.2 eV.
김국렬(Kuk Ryul Kim),임찬우(Chan Woo Lim),정준기(Jun ki Jung),이태연(Tae Yeon Lee),채장범(JangBom Chai) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Safety has become the most important issue in operation and maintenance in nuclear power plants. Therefore, It is necessary to find defects in on early stage and to identify them to be corrected. In this paper, the method to monitor and diagnose the condition of a reciprocating pump, which is used to supply the cooling water was developed. To characterize the parameters of the reciprocating pump with the data, a flow loop was designed and constructed. The pump was operated under the various conditions and the defects were introduced on pump to examine their effects on the signal. Normal and defected signatures were gathered and analyzed to develop the patterns of defects. Based on the database, the diagnostic algorithm was developed and tested.
정준기,이상호,박중겸,심성보,옥영철,이규웅 대한신경외과학회 1976 Journal of Korean neurosurgical society Vol.5 No.1
The authors present 2 cases of malignant pituitary adenoma. One case has remote metastases to the right frontal lobe, and the other case has invasion into the adjacent temporal lobe and malignant features histologically. Malignant pituitary adenoma constitute less than 1% of the large reported series of pituitary adenoma, which defined as (1) it burst its capsule to invade the adjacent nervous structures of bone, (2) it shows malignant features histologically, such as frequent mitoses, anaplasia with hyperchromatic pleomorphic cells, loss of alveolar arrangement, and (3) presence of distant metastases.