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초음파 분무 열분해법에 의한 산화물 환원 공정의 구형 Bi₂Te₃ 분말 합성
송철한(Chul-Han Song),장대환(Dae-Hwan Jang),진연호(Yun-Ho Jin),공만식(Man-Sik Kong) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.2
Bismuth telluride (Bi₂Te₃) and its alloys are well-known thermoelectric materials for ambient temperature applications. In this study, the dissolved Bi-Te precursor solution was used to synthesis metallic Bi₂Te₃ powder via ultrasonic spray pyrolysis and reduction process. The droplets of the Bi-Te precursor solution were decomposed to Bi-Te oxide powders by ultrasonic spray pyrolysis. The spherical Bi₂Te₃ powders were synthesized by reduction reaction in atmosphere of hydrogen gas at the temperature above 375℃ for 6h. The reduced Bi₂Te₃ powders have a mean particle size of 1.5 μm. The crystal structure of the powder was evaluated by X-Ray diffraction(XRD), and the microstructure with size and shape powders was observed by fieldemission scanning electron microscope(FE-SEM) and transmission electron microscope(TEM).
자궁경부 고도 상피내종양의 치료에 CO2 레이저 원추절제와 LEEP의 비교연구
박형기,송철,변지수,최호선,한수,박현주,임세혁 대한부인종양 콜포스코피학회 1996 Journal of Gynecologic Oncology Vol.7 No.4
Between June 1990 and May 1994, 350 laser conization and 200 LEEP were performed. Indications of conization were that directed biopsy specimen was proved CIN II, III or suggests possible microinvasion. In all the cases the procedures were carried out with the patients under local anesthesia. Excisional cone sections(6,600) were evaluated for lesion length,depth and margin status. Invasive cancer was found in 5(1.4%) women of laser group. Operative time was shorter LEEP group than laser group significantly. In laser group, 25(8.3%) women had bleeding that required treatment. One case(0.3%) of pelvic infection and 7 cases(2.3%) of cervical stenosis were observed. In LEEP group, 10(5.3%) women had bleeding, 3(1.6%) patients became cervical stenosis. The diameter of bumed tissue was 0.28mm in laser group and 0.25mm in LEEP group. Success rate were 97.4% in former and 96.3% in later. This study demontrated that CO2 laser conization and LEEP were effective methods for treating high grade cervical intraepithelial neoplasia and added benefit of preserving reproductive function and rule out invasive carcinoma.