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상압 플라즈마 표면처리가 기판과 코팅층 사이에 생기는 중간층과 부착특성에 미치는 영향
김동용 ( Dong Yong Kim ),박홍석 ( Hong Seok Park ),배광진 ( Kwang Jin Bae ),김종구 ( Jong Gu Kim ),조영래 ( Young Rae Cho ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.12
The effect of atmospheric plasma treatment on change in the interlayer and the adhesion strength between the substrate and the coating layer was investigated. Soda-lime glass and indium-tin oxide (ITO) coated glass plates were used as the substrate, and the surface energy was calculated from the wetting angle of liquids on the substrates. To study the effect of surface treatment on the adhesion strength between the substrate and the coating layer, chrome (Cr) thin film was deposited on the surface treated substrates by sputtering. For the analysis of the interlayer, auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) were used. The surface energy of the substrates increased as a function of exposure time for atmospheric plasma surface treatment. When the exposure time exceeded 20 sec, the surface energy increased to a saturated value of 76 mJ/m2. The adhesion strength between the substrate and Cr coating layer according to the surface treatment showed a similar trend of the surface energy. The atmospheric plasma surface treatment using argon and oxygen gases promoted the formation of an interlayer that was identified as chrome oxide (Cr2O3). The thicker chrome-oxide interlayer contributed to the increase in adhesion strength between the substrates and the Cr coating layer.
혈액투석을 위한 내경정맥 도관 삽입 중 진단한 무형성 우상대정맥 및 지속성 좌상대정맥 1 예
이태유(Tae Yu Lee),김근숙(Keun Sook Kim),정연손(Youn Son Chung),진희종(Hee Jong Jin),민영훈(Young Hoon Min),조구영(Goo Yeong Cho),박홍석(Hong Suk Park),김근호(Gheun Ho Kim),김성욱(Sung Wook Kim) 대한신장학회 2002 Kidney Research and Clinical Practice Vol.21 No.4
Persistent left superior vena cava(PLSVC) derives from abnormally persistent patency of an embryological vessel normally present during the early developmental period. The incidence of PLSVC is 0.3% in healty persons, 4.8% in patients with congenital heart anomaly. Most of the patients with PLSVC have normal right superior vena cava (RSVC), but PLSVC plus absent RSVC is very rare, especially in those without congenital heart anomalies. We experienced a case of PLSVC and absent RSVC during an insertion of internal jugular venous catheter for acute hemodialysis. A 53-year-old female was admitted due to uremia for initiation of dialytic therapy. She had long history of diabetic nephropathy but without congenital heart anomalies. We inserted a dual lumen catheter for acute hemodialysis via right internal jugular vein. On the chest x-ray film taken after the insertion of the catheter, we detected unusual course of the catheter curved to the left. PLSVC and absent RSVC was confirmed by normal saline contrast echocardiography and CT angiograpy.