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발사체 안테나 이득패턴을 이용한 팔라우추적소 링크버짓 분석
김춘원,권순호,이태진,김동현 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.8
본 논문에서는 팔라우추적소 원격자료수신장비 링크버짓 결과를 예측하고 실제 신호수신레벨과 비교 분석하였다. 팔라우추적소는 발사 임무에 처음으로 참여하였으며, 지리적 특성상 비행시험 등 안테나 추적 및 신호 수신 성능에 대한 검증 시험에 어려움이 있어 발사체 궤도 및 자세각에 따른 송신 안테나 편파별 이득 값의 변화를 예측하여 보다 정확하게 링크버짓을 분석하였다. 분석결과는 팔라우추적소 신호 수신 가능 구간, 안테나 구동각도와 좌현/우현 편파 예상 수신레벨 분석에 활용되었고, 발사임무 운용 결과 안테나 실제 수신레벨은 링크버짓 결과와 유사함을 확인하였다.
원격자료수신장비 소형반사판 안테나 G/T 예측 및 측정
김춘원,안나균,김동현,조병록 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.9
In this paper, the calculation using simulation and two measurement methods for G/T of the telemetry are analyzed. Antenna gain and noise temperature are calculated by using ICARA and Antenna Noise Temperature Calculator. System G/T were calculated by using Antenna gain/noise temperature, LNA gain/noise temperature, cable loss. The first G/T measurement method is Y-factor measurement method, which is to calculate G/T by comparing LNA noise temperature and a signal level difference when an antenna and a 50ohm termination are respectively connected to an LNA input terminal Second method is Solar calibration measurement method that is to calculate G/T by comparing noise level difference when looking at the sun and lowest level point. Finally, the accuracy was reviewed by comparing the G/T calculation results with the two measurement methods, and the optimal measurement method according to antenna performance and operating environment was presented. 본 논문에서는 나로우주센터에서 운용 중인 원격자료수신장비의 G/T에 대한 시뮬레이션 활용 계산 결과와 측정 방법 2개에 대하여 분석하였다. 안테나 이득과 잡음 온도는 ICARA와 Antenna Noise Temperature Calculator를 이용하여 계산하였다. 시스템 G/T는 안테나 이득/잡음돈도와 LNA 이득/잡음온도, 케이블 손실을 반영하여 산출하였다. 첫 번째 G/T 측정 방법은 Y팩터 측정법으로 LNA 입력단에 안테나와 50ohm 터미네이션을 각각 연결했을 때의 신호 레벨 차이값을 LNA 열잡음 온도와 비교하여 G/T를 산출하는 방법이다. 두 번째 방법은 태양과 최저 레벨 지점을 바라보았을 때의 잡음 레벨 값 차이를 비교하여 G/T를 구하는 Solar Calibration 측정법이다. 마지막으로 G/T 계산결과와 두 측정법 비교를 통해 정확성을 검토하고 이로부터 안테나 성능, 운용환경에 따른 최적 측정법을 제시하였다.
火傷 및 火傷後 Prednisolone 長期投與가「마우스」臟器의 電解質에 미치는 影響에 關한 實驗的 硏究
金春元,白承龍 고려대학교 의과대학 1973 고려대 의대 잡지 Vol.10 No.1
One of the most perplexing subjects in clinical physiology is fluid and electrolyte metabolism. It has long been recognized that deprivations, losses, and abnormalities of distribution affecting water and inorganic substances in the body are extreme importance in many clinical conditions. Author has attempted an experimental study to clarify the changes of tissue electrolyte contents after burn and prednisolone injection after burn. 510 male S.M. mice, weighing about 15~20gm were selected and divided into 4 groups as follows; normal control group, prednisolone injection group, burn group and prednisolone injection after burn group. The contents of Na, K and Cl in unit weight of the kidney, spleen and liver were measured after 4 hours, 1, 2, 3, 5, 7, and 10 days of experimental treatment. The result obtained are summarized as follows: 1. Electrolyte contents in unit weight of each organ of normal control group were as follows: Kidney: Na: 78.7±6.5, K: 76.8±5.8, Cl: 73.0±4.8 Spleen: Na: 44.4±2.4, K: 116.7±9.3, Cl: 88.9±5.8 Liver: Na: 40.3±2.7, K: 87.7±7.6, Cl: 44.0±2.4 The Na content was highest in the kidney and the K and Cl were highest in the spleen, while the Na and Cl contents in the liver were lowest. 2. In the spleen and liver of burn group, marked increase of Na and marked decrease of K was noticed throughout the course. Cl was moderately decreased only in the spleen. 3. There was no significant difference of electrolytes change in the spleen and lover between 10% and 20% burn of second degree. 4. In prednisolone injection after burn group, normal recovery of electrolytes change in the spleen and liver were delayed by prednisolone injection. 5. Both in burn and prednisolone injection after burn groups, tissue electrolytes change were not remarkable in the kidney on the contrary of marked change in the spleen and liver.