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C.-S. Seok(석창성),D. H. Kim(김담현),J. M. Lee(이종민),N. G. Jun(전남규),K. B. Park(박기범),K. K. Kim(김기근) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Thermal barrier coating (TBC) is technology applied to gas turbine blades to ensure high-temperature safety. When TBC is exposed to high temperature, thermally grown oxide (TGO) is formed due to degradation. TGO weakens the bonding strength between the top coating and bond coating of TBC and causes breakage. So, technology that can predict the growth behavior of TGO and secure durability of TBC is necessary. However, the prediction of the growth behavior of TGO uses an empirical method for each TBC. This method cannot be universally used due to the disadvantage that empirical formula cannot be used when microstructure of TBC is changed. In this study, an isothermal degradation test was performed under various degradation conditions to predict the growth of TGO of TBC manufactured by the Air Plasma Sprayed (APS) method. As a result of measuring the thickness of TGO, the exponential term of the growth equation was affected by the microstructure of the top coating. And the reaction rate constant k can be derived through the Arrhenius equation. Finally, using the two relationships, an equation for predicting the TGO thickness of TBC manufactured by the APS method was derived.
위장관 ( 胃腸管 ) : 소아장중첩증의 치료에 영향을 주는 요인 분석
김종우(J . W . Kim),황의호(E . H . Hwang),최승훈(S . H . Choi),이철(C . Lee),김규언(K . U . Kim),이승규(S . K . Lee),오기근(K . K . Oh),손영모(Y . M . Son) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.3
N/A We report the retrospective analysis of 111 patients with intussusception who were admitted to the Department of Surgery and Department of Pediatrics of Yongdong Severance Hospital from March 1,1988 to August 31,1989. SPSS-PC with IBM-AT personal computer was used for the analysis of the data. Following results were obtained. 1) 79 patients were successfully treated with Barium reduction and patients underwent sugical management. The success rate of Barium reduction was 71.2%. 2) Male to female ratio was 1.8:l. Occurrence of the age under 12 months was 69.6% for surgically treated group and 78.1%. for medically treated group. 3) Mean hospital stay of surgically treated group was 7.5 days and that of medically treated group was 3.9 days. (p=0.012) 4) Duratian of symptom was 38.6 hours for surgically treated group and 25.4 hours for medically treated group.
원발성(原發性) 역행성(逆行性) 결장중적증(結腸重積症)1예
이종태,최병숙,황의호,오기근,윤범용 대한소화기학회 1977 대한소화기학회지 Vol.9 No.1
A case of primary retrograde colonic intususception which was surgically proven in 11 years old, of age is reported. The patient, male, aged eleven years, had been complaint of intermittent abdominal pain and mucoid diarrhea for 3 months. A few days prior to admission, he has been developed severe abdominal pain, diarrhear with blood and vomiting. The physical examination revealed the abdominal rigidity and palpable mass with 2×7×3 cm in size at the mid abdomen. It was smoothly lobulated and not tender. The x-ray examination of abdomen showed the welloutlined mass density in coincidence with the mass detected by physical examination. In barium enema the complete obstruction of sigmoid colon with smoothly cupshaped margin was demonstrated. A tentative diagnosis of intussusception was made. The abdominal operation established a retrograde intussusception of the sigmoid colon into the ascending colon upward about 8cm. The intusussception could be well reduced.