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RISS 인기검색어
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- 저자 : 최재만(Jae Man Choi) (검색결과 5 건)
- 무료
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최재만 ( Jae Man Choi ) 공군사관학교 2014 空士論文集 Vol.65 No.-
본 연구에서는 항공탄약에 대한 정량적인 신뢰도 평가를 위해 운영데이터를 확보하고, 이를 바탕으로 신뢰도 평가절차 및 향후 발전방향을 제시하였다. In this research reliability analysis was conducted by using commercial software Minitab with a field data of AIM-9 missile. According to reliability analysis for a field data of Aim-9 missile components, GCS data were suitable for Weibull distribution, Warhead and Target Detector data were suitable for Normal distribution, in case of Rocket Motor data Exponential distribution was suitable. Also characteristics of life distributions for GCS, Warhead and Target Detector was shown an increasing failure rate as time goes by on the bathtub curve. On the other hand characteristics of Rocket Motor was shown a constant failure rate. Finally, based on the reliability analysis results from AIM-9 Components, this research describes about an establishing study for an quantitative reliability evaluation method of ammunition(AIM-9).
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항공기 정비계획을 위한 J79 엔진 Transfer Gearbox의 고장데이터 분석
최재만(Jae Man Choi),양승효(Seung Hyo Yang),황영하(Young Ha Hwang),손익상(Ik Sang Son),온용섭(Yong Sub On),김영진(Young Jin Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.6
고장의 특성을 예상하는 것은 미래의 고장을 예견하고 최적의 교체간격을 결정할 수 있도록 해주기 때문에 정비 계획에서 매우 중요하다. 본 연구에서는 신뢰도 해석에서 가장 전통적인 방법 중의 하나인 확률지에 도시하는 기법을 이용하여 J79 엔진 Transfer Gearbox의 고장 분포를 검토하였다. 고장 데이터에 대한 적절한 분포를 찾기 위해서 다양한 확률분포가 이용되었으며, 얻어진 상관계수는 고장데이터가 대수정규분포에 가장 근접함을 나타내었다. 예상되는 비계획 정비행위의 횟수와 다양한 비용 비율에 대해서 최적의 교체간격을 구하였다. Forecasting possible failure characteristics is very important in maintenance planning because it helps in predicting any future failures and determining the optimum replacement interval. This paper examines the time?to-failure distribution of the transfer gearbox of a J79 engine by using a probability plotting technique which is one of the most convenient techniques for reliability analysis. Various probability distributions are evaluated for determining the suitable probability distribution of the failure data of the transfer gearbox, and the resulting correlation coefficient indicates that failure data have a lognormal distribution. The expected number of unscheduled maintenance actions and the optimum replacement interval for various values of cost ratios are determined.
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무릎관절의 근피로 유발 후 냉처치 요법 적용 시간이 피부온도 및 관절위치감각에 미치는 영향
최재일(Choi, Jae-Il),정승만(Jung, Seung-Man) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.4
The purpose of this study was to investigate the effect of cryotherapy time on the skin temperature and joint position sense after exercise-induced muscle fatigue of Knee Joint in 20 healthy male adults. The subjects of this study (n=20) participated in three trials, which included an non-cryotherapy, a 5-minute cryotherapy, and a 10-minute cryotherapy. Statistical analysis showed that the temperature of the thigh skin was 32. 54 ± 0 . 87 ℃ in the non-cryotherapy and the absolute error was 13.05 ± 2.98 ° in the knee joint position sense. The skin temperature of the thigh skin was 26.88 ± 2.29 ℃, which was significantly lower than that of the non-cryotherapy. The absolute error of the knee joint position sense was 9.70 ± 2.11 °,which was significantly lower than that of the non-cryotherapy and 10-minute cryotherapy. On the other hand, the skin temperature of the thigh skin was 22.01 ± 1.57 ℃ for 10-minute cryotherapy, and it was significantly lower than the non-cryotherapy and 5-minute cryotherapy. The absolute error of the knee joint position sense was 12.20 ± 3.14 °, which was significantly higher than that of 5-minute cryotherapy. Therefore, it is considered appropriate to apply cryotherapy less than 10 minutes in order to prevent muscle fatigue in sporting events.
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뇌하수체 선종으로 감마나이프 치료 시행 후 발생한 뇌하수체 상피양 골육종 1예
박소영 ( So Young Park ),김유진 ( You Jin Kim ),이은정 ( Eun Jeong Lee ),최재신 ( Jae Shin Choi ),김재현 ( Jae Hyeon Kim ),진상만 ( Sang Man Jin ),허규연 ( Kyu Yeon Hur ) 대한내과학회 2017 대한내과학회지 Vol.92 No.2
본 증례는 수술 및 감마나이프 치료로 뇌하수체 선종을 치료하고 추적 관찰 중이던 환자에서 13년 후 뇌하수체 상피양 골육종이 확인된 증례이다. 고전적 방사선 치료와 관련된 이차성 종양의 발생에 대하여는 잘 알려져 있으나 상대적으로 저선량이 사용되는 정위적 방사선 치료에서는 이와 관련된 보고는 매우 드물다. 정위적 방사선 치료 후 발생하는 이차성 종양은 흔하지 않으나 임상 의사가 염두에 두어야 하는 부작용 중 하나이므로 증례보고하는 바이다. With the increasing use of stereotactic radiosurgery, recent reports have suggested that stereotactic radiosurgery may induce sec-ondary malignancies. While the risk of secondary malignancy after conventional radiotherapy is well known, its development after stereotactic radiosurgery has been reported in only a few cases. Here we present the case of a 56-year-old female with visual dis-turbance of sudden onset. She underwent trans-sphenoidal surgery for a pituitary adenoma 13 years earlier. Imaging studies re-vealed a newly developed pituitary mass invading the right carvenous sinus. Gross total resection of the tumor was performed using a trans-sphenoidal and pterygopalatine fossa approach. The histological diagnosis was pituitary epithelioid osteosarcoma. Clinicians should be aware of the rare occurrence of radiation-induced pituitary sarcoma as a potentially fatal late complication of stereotactic radiosurgery. (Korean J Med 2017;92:195-199)
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