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김정택,백경갑,주성후,Kim, Jung-Taek,Paek, Kyeong-Kap,Ju, Sung-Hoo 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.11
The characteristics of organic films can be affected by the temperature of evaporation source because the temperature of evaporation source has an effect on substrate temperature during OLED fabrication process using the thermal evaporation. To investigate the characteristics of OLED devices fabricated by using thermally damaged organic films, I-V-L and half life-time in OLED devices fabricated with various substrate temperatures were measured. During emission layer(EML) evaporation, OLED devices with a structure of ITO(100 nm)/ELM200(50 nm)/NPB(30 nm)/$Alq_3$(55 nm)/LiF(0.7 nm)/Al(100 nm) were fabricated at various substrate temperatures(room temperature, $30^{\circ}C$, $40^{\circ}C$, and $50^{\circ}C$). The characteristics of current density and luminance versus applied voltage in OLED devices fabricated shows that many electrical currents flowed and high brightness appeared at low voltage, but that the lifetime of OLED devices dropped suddenly. This phenomenon explained that the crystallization of $Alq_3$ thin film appeared owing to the substrate heating during evaporation.
기관 협착 환자에서 고빈도 제트 환기법응 이용한 기관 성형술
김정택 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.5
The patients with tracheal stenosis have become more increasing in recent due to the increased use of tracheostomy and assisted ventilation Anesthetic management during tracheal reconstruction is a concern to the anesthetist and the surgeon, who must share the airway as a operation field and at the same time provide good gas exchange. Multiple technique such as the tube ventilation system or C \ulcornerP bypass method have been recommended to achieve this goals. However, these methods have disadvantages of poor surgical exposure and hemorrhagic complication from using C \ulcornerP bypass The technique for HFJV was first described for bronchoscopy, and it involves positive-pressure breathing with high flow[40 \ulcorner60L/min] of oxygen This flow is directed to a semirigid catheter inserted in the endotracheal tube and the tracheal reconstruction can be done without interruption. From Dec. 1986 to July 1990 we have experienced 6 patients of tracheal stenosis necessitating circumferential resection and end to end anastomosis; 5 patients with tracheal stenosis following cuffed tracheostomy or intubation, a patient with tracheal stenosis due to invasive thyroid cancer. The specific advantages during tracheal reconstruction are unobstructed field during surgical reconstruction and good gas exchange through the procedure.
특발성 식도비후환자에서 EEA Stapler를 사용한 식도위문합 후에 발생한 식도협착 -1례 보고-
김정택,정경영,이두연,Kim, Jeong-Taek,Jeong, Gyeong-Yeong,Lee, Du-Yeon 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.3
Since Steichen and Ravich`s pioneer work in 1972 proved that staples reduced anastomotic leaks and operative time, the use of EEA stapler`s in esophagogastrostomy have gained acceptance and popularity. But overriding these benefits are the high stricture rate, which leads to the reappearance of dysphagia. The mechanism for the development of stricture in stapled anastomosis is likely to be due to the lack of mucosa to mucosa apposition and presence of necrotic tissue between the luminal edge and the rows of the stapler. All strictures were easily dilated. Recently, we encountered a patient who suffered from an esophageal stricture that slowly developed 10 months after an esophagogastric anastomosis with a EEA 425 was performed due to severe muscular hypertrophy of esophagus. Because the stricture failed to respond to the Bougienage, we reoperated using a EEA 28 this time. We feel that this case review helps to show that despite the very low leakage rate in small size EEA stapler, there is also a very high risk of stricture.