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1984년 ~ 2023년까지 1,217 건의 한국우주과학회지를 계간으로 확인하실 수 있습니다.
- The Korean Space Science Society (The Korean Astronomical Society)
- 계간 (Quarterly)
- ISSN : 1225-052x (ISSN : 1225-052x)
1225-052x
- DB구축현황 : 1,217건 (DB Construction : 1,217 Articles)
총 게시글 1,217건
페이지 122/122
1211
- Nha, Il-Seong
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 2, n.2
- pp.69-99
- 1985
- 원문 바로보기
The UBV observations of the Brightest RS CVn-type eclipsing binary star AR Lac were made at four observatories, two in Korean and two in the U.S. in the 1980-81 and 1981-82 seasons. As a result of the cooperation, two light curves in the yellow and in the blue were completed for each observing seasons. Ultraviolet observations were also made at three of the four observatories. The orbital period of AR Lac apparantly decreased around 1977. An analysis of our yellow light curves together with five other yellow curves available in the literature since 1975 shows that there seems no periodicity in the migration of the distortion waves. There is a gradual decrease of at least 0.m1 between 1976 and 1982 in the brightness of the cooler component if one assumes that the hotter component is constant.
1212
- Chou, Kyong-Chol
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 1, n.1
- pp.5-21
- 1984
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The airflow along the surface of a launch vehicle together with base flow of clustered nozzles cause problems which may affect the stability or efficiency of the entire vehicle. The problem may occur when the vehicle is on the launching pad or even during flight. As for such problems, local steady-state loads, overall steady-state loads, buffet, ground wind loads, base heating and rocket-nozzle hinge moments are examined here specifically.
1213
- Lee, Yong-Sam
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 1, n.1
- pp.55-65
- 1984
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A total of 618 photoelectric observations (302 in yellow and 316 in bule) is made in 1982 at the Yonsei University Observatory. Except that of the secondary eclipse the homogeneous coverage of observations successfully secured B, V, and B-V light curves. Enhanced distortions in the light curves are appeared at the phases aroung <TEX>$0.^P1$</TEX>, which supports the wave-like migration period of 9.7 years(Rodono 1981). One epoch time of the primary minimum was made by combining the observations in three nights. This minimum time shows that the O-C values are still decreasing and there seems to indication of increasing. B and V light curves of the primary minimum are in strong asymmetry which show less luminous in the third and fourth contacts compared to those of the first and second ones. This asymmetry may be as a result of the reflection of the wave minimum at <TEX>$0.^P1$</TEX>, and B-V curve also shows asymmetry, redder at the third contact than the second one by about <TEX>$0.^m04$</TEX>. This color difference apperature distribution on the surface of cooler, larger component(KO IV star).
1214
- Park, Hong-Suh
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 1, n.1
- pp.67-74
- 1984
- 원문 바로보기
Photoelectric UBV light curves of AR lacertae made in one season during 1981-82 are presented. Although the shape of the light curves in the outside eclipses shows a strong distortion, the scatter of observations as well as phase coverage are better than those previously available. Fourier coefficients are derived from the V-light curve and the observed curve successfully rectified to the Russell model. Light curve solutions are computed and the geometrical and physical parameters of AR Lac are derived as <TEX>$a_s$</TEX>=0.182, <TEX>$a_g$</TEX>=0.341, j=<TEX>$86^{circ}$</TEX>3, <TEX>$L_s$</TEX>=0.372, <TEX>$L_g$</TEX>=0.628, k=0.53, <TEX>$X_s$</TEX>=0.85, <TEX>$X_g$</TEX>=0.4.
1215
- Choi, Kyu-Hong
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 1, n.1
- pp.23-34
- 1984
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A bubble trapped in the liquid manifold of INTELSAT IV F-7 spacecraft caused a mass imbalance between the System 1 propellant tanks and a wobble half angle of 0.38 degree to 0.48 degree. A maneuver on May 14, 1980 passed the bubble through the axial jet and allowed propellant to redistribute. A 0.2 rpm change in sin rate was observed with an exponential decay time constant of 6 minutes. In this paper, moment of inertia, tank geometry and hydrodynamic models are derived to match the observed spin rate data. The values of the total mass of propellant considered were 16, 19 and 20 kgs with corresponding mass imbalances of 14.3, 15 and 15.1 Kgs, respectively. The result shows excellent agreement with observed spin rate data but it was necessary to assume a greater mass of hydrazine in the tanks than propellant accounting indicated.
1216
- Han, Won-Yong
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 1, n.1
- pp.41-53
- 1984
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Photoelectric observations of the close eclipsing binary system CW Cep, which is well known of its apsidal motion, were made on 20 nights during August and November in 1983 using two 61cm reflectors at the Sobaeksan Observing Station of Korean National Astronomical Observatory and I1san Observing Station of Yonsei University Observatory. Standardized new light curves in UBV system are presented with a total of 1,422 individual observations. For the corrections of regional and instrumental differences, same standard stars were observed at the two observatories. Four new times of minimum light were determined with the method of Kwee and van Woerden(1956). With all of the collected times of minima, apsidal motion of this system was checked, but the O-C values calculated by the light elements of Nha(1975) and Soderhjelm (1976) did not coincide well with new times of minima. New light elements which satisfy most times of minima better, and are deduced the apsidal period derived by the new light elements turns out to be 43 years, somewhat longer than those of values previously known.
1217
- 김선규
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 1, n.1
- pp.35-39
- 1984
- 원문 바로보기
Space Shuttle의 성공적인 비행을 가능케한 요인중의 하나가 Silica Tile을 사용한 재사용 할 수 있는 Thermal Protection System의 설계이었다. 이러한 Thermal Protection System의 기본 설계 개념을 밝히고 또한 Silica Tile의 생산 공정과 Tile System의 구조를 서술하였다.