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양호준(Ho-Jun Yang),이유리(Yu-ri Lee),조성민(Seongmin Cho),유경덕(Kyungdeok Yu),김종필(Jong-Pil Kim) 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.1
위성용 TR모듈이 지상용 또는 항공용 TR모듈과 다른 점은 높은 레벨의 진동, 충격과 같은 발사환경과 우주방사능, 진공, 온도 변화와 같은 궤도환경 고려가 필요하다는 것이다. 따라서 지상용 또는 항공용 요구사양과는 다른 전기적, 구조적 조건을 요구한다. 이에 따라 서론에서는 발사환경, 궤도환경에 대해서 서술하고, 본문에서는 위성용 TR모듈에서 GaN의 활용과 요구되는 조건을 충족하기 위한 설계 과정을 기술한다. 특히, 부품선정부터 Derating&RF Budget 설계, 공정설계, 열해석까지 각각 단계에서 고려할 설계요소에 대해서 서술한다. TR module using in satellite must consider discriminative electrical and mechanical requirements compare to the one using in ground and aircraft system since not only the environment level of vibration and shock during the launch stage but also the level of radiation, vacuum and thermal variation from orbit environment are more severe than atmosphere condition. This paper describes the environmental conditions of launch and the orbit and, suggests design method of TR module applying GaN to satisfy the unique environmental requirements of satellite systems by especially focusing on parts selection, derating design, RF budget design, manufacturing process design, and thermal design of TR module.
Wagner 재치환 주대를 이용한 대퇴 주대의 재치환술
강창수(Chang Soo Kang),양호준(Ho Jun Yang) 대한고관절학회 1999 Hip and Pelvis Vol.11 No.1
Korea Between 1992 and 1996, 9cases involving Wagner SL femoral revision stems(Protek, Berne,Switzerland) were operated upon our hospital. The Wagner revision stem was designed to revise loosened femoral implant with extensive bone resorption and damage in the prosthetic bed. The indications were: 8 cases of extensive bone resorption and destruction of the proximal prosthetic bed and one periprosthetic fracture. The average follow up time was 40 months. The average age of the patients was 49.2 years(ranging 43 to 60 years). The average preoperative Harris hip score was 48.2 points, postoperative 85.7 points. 7 cases showed that, within a few months, new bone was developing in the proximal femoral bone defect. Subsidence of the stem was noted in 3 patients(ranging 6m/m to 15m/m), but was asymptomatic and did not require re-operation. We recommend the Wagner SL femoral revision stem, not as a routine procedure to treat loosening, but for patients with severe femoral bone resorption after THA or periprosthetic fractures,Girdlestone situation, and geriatric patients with peritrochanteric or subtrochanteric fractures.