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1984년 ~ 2025년까지 1,253 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 : 1,253건 (DB Construction : 1,253 Articles)
총 게시글 1,253건
페이지 92/126
911
- Moon, Hong-Kyu
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 18, n.3
- pp.191-208
- 2001
- 원문 바로보기
We have recently compiled a database of the properties of 192 impact craters, which supercedes previous compilations. Using our database, the impact structures found in North America, Europe and Australia have been examined; these cratonic areas have been relatively stable for considerably long geological periods, and thus have been best preserved. It is confirmed that there is a close correlation between the geological epoch boundaries, the epochs of mass extinctions, antral the 'timing' of impacts. In addition, the terrestrial cumulative flux of objects >20km is found to be <TEX>$1.77{\times}10^{-15}km^{-2}yr^{-1}$</TEX>, over the last 120 Myr, which is much smaller than the published values in McEwen et al. (1997) and Shoemaker (1998) (<TEX>$5.6{\pm}2.8{\times}10^{-15}km^{-2}yr^{-1}$</TEX>. For terrestrial impact structures with D> 50 km, the apparent cumulative flux over the last 2450 Myr is ~50 times smaller than the corresponding value for the Moon. If we assume that the Earth and the Moon suffered the same level of bombardment over this time, this would mean that the actual flux of impacting bodies, capable of making craters with D)50 km, was ~ 50 times larger than the apparent flux estimated from the currently known terrestrial records.
912
- 김성준
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 18, n.1
- pp.71-80
- 2001
- 원문 바로보기
KITSAT-1에 탑재된 Total Dose Experiment (TDE)로 부터 관측된 RADFET의 문턱전압 변화를 원자력 연구소 조사실의 Co-60 감마선 조사 장치를 이용한 보정 실험을 통해 총 방사능양으로 환산하였다. 위성 내 센서의 위치에 따라 측정되는 총 방사능양이 다르게 나타났으며, 지구 자기권에서의 NASA 방사선 모델을 이용한 시뮬레이션을 통해 이러한 차이가 센서 위치에 따라 위성체에 의한 차폐 효과가 다르기 때문에 나타나는 현상임을 확인하였다.
913
- 김현주
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.221-232
- 2000
- 원문 바로보기
밀리미터파 우주잔파 수신기의 국부 발진기로 사용될 수 있는 도파관형 건 발진기를 제작하였다. 제작한 건 발진기는 60 GHz에서 70 GHz까지 발진하는 광대역 특성을 보였다. 건 발진기는 공진 디스크와 포스트의 직경 변화와 다이오드 특성에 따라 발진 주파수의 특성이 달라진다. 본 논문에 우리는 광대역 발진 특성을 가지는 건 발진기의 설계 방법과 측정결과를 보였으며, 제작한 발진기는 대덕천파천문대의 100/150 GHz대 이중채널 수신기로 활용되고 있다.
914
- Sohn, Young-Jong
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.133-140
- 2000
- 원문 바로보기
From the VI images of M13, obtained by using 2K CCD camera and the BOAO 1.8m telescope, we derive the(V - I) - V CMD of M13. From the shapes of red giant branch, the magnitude of horizontal branch, and the giant branch bump on the constructed CMD, we determined the metallicity of the globular cluster to be 1.74<TEX>${\lesssim}$</TEX>[Fe/H]<TEX>${\lesssim}$</TEX>-1.41. The good agreement between our determination of [Fe/H] and those determined by using other methods implies that the morphology of red giant and horizontal branches on (V - I) - V CMD's can be good indirect metallicity indicators of Galactic globular clusters.
915
- Kim, Hyo-Min
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.317-328
- 2000
- 원문 바로보기
The solar wind contributes to the formation of unique space environment called the Earth's magnetosphere by various interactions with the Earth's magnetic field. Thus the solar-terrestrial environment affects the Earth's magnetic field, which can be observed with an instrument for the magnetic field measurement, the magnetometer usually mounted on the rocket and the satellite and based on the ground observatory. The magnetometer is a useful instrument for the spacecraft attitude control as well as the Earth's magnetic field measurements for the spacecraft purpose. In this paper, we present the preliminary design and test results of the two onboard magnetometers of KARI's (Korea Aerospace Research Institute) sounding rocket, KSR-3, which will be launched four times during the period of 2001-02. The KSR-3 magnetometers consist of the fluxgate magnetometer, MAG/AIM (Attitude Information Magnetometer) for acquiring the rocket flight attitude information, and of the search-coil magnetometer, MAG/SIM (Scientific Investigation Magnetometer) for the observation of the Earth's magnetic field fluctuations. With the MAG/AIM, the 3-axis attitude information can be acquired by the comparison of the resulting dc magnetic vector field with the IGRF (International Geomagnetic Reference Field). The Earth's magnetic field fluctuations ranging from 10 to 1,000 Hz can also be observed with the MAG/SIM measurement.
916
- 김방엽
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.1
- pp.107-116
- 2000
- 원문 바로보기
본 연구는 지구 공전 궤도 근처의 Leonid의 출현 빈도와 속도 등을 예측하기 위한 연구의 초기 단계로서 meteoroid에 대한 기초 자료 조사와 더붙어 기존에 알려져 있는 meteoroid 입자의 분출 속도 모텔과 섭동 모델로부터 meteoroid의 운동 방향과 속도를 컴퓨터로 계산하기 위한 프로그램을 개발하고 이것을Leonid stream에 적용해 보았다. 입자의 초기 속도 모델로는Jones의 분출속도 분포모델을 사용하였으며, meteoroid의 궤도 운동 모델에는 태양과 달, 지구를 비롯한 각 행성들의 섭동 모델이 포함되었다. 태양계 천체들의 Ephemeris를 구하기 위해 JPL (Jet Propulsion L Laboratory)의 SSD (Solar System Dynamics) Laboratory에서 개발된 DE405 Solar System E Ephemeris 데이터 파일을 사용하였다. 이외에 중요한 섭동 요소로써 태양 복사압을 고려하였으며, 적분 알고리즘으로는 8차 Runge-Kutta 방법을 사용하였다.
917
- Lee, Byoung-Sun
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.285-294
- 2000
- 원문 바로보기
The post-launch mission analysis of the KOMPSAT-1 spacecraft was carried out. The injection accuracy of the Taurus launch vehicle was analyzed by comparison of the target and the realized orbit parameters. The tracking station contact analysis was also performed based on the state vectors applied at the day of launch. The offset angles between the predicted orbit and realized orbit were calculated for various tracking stations. The injection orbit parameters of the KOMPSAT-1 were analyzed for the possible options in Launch and Early Orbit Phase(LEOP) operations. Variations of the Local Time of Ascending Node(LTAN) were also obtained.
918
- Kim, Sang-Joon
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.147-150
- 2000
- 원문 바로보기
A fluorescent equilibrium model for the 1-0 band of the A-X system of <TEX>${18}^{OH}$</TEX> has been constructed. Line positions and intensities have been calculated for possible future spectroscopic observations of these bands from space in order to derive <TEX>${18}^{O}/{16}^{O}$</TEX> ratios in comets. It is demonstrated that the strong lines of the 1-0 band can be observable for a moderately bright comet using a high resolution spectrometer with a reasonable exposure time.
919
- 김천휘
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.173-180
- 2000
- 원문 바로보기
아직 잘 연구 되지 않은 식쌍성 V651 Cas의 극심시각을 모두 수집하여 분석하였다. 그 결과, 이 쌍성의 공전주기가 규칙적으로 변화해 왔을 가능성을 발견하였다. 이를 제3천체에 의한 광시간 효과때문으로 가정하여 광시간 궤도요소를 구하였다. 최종적으로 구한 광시간 궤도의 주기, 반-진폭, 그리고 이심율은 각각 <TEX>$5.^y66,\;0.^d00144$</TEX>, 그리고 0.92이다. 이 논문에서 제시한 제3천체의 존재 확인을 위하여 극심시각의 많은 관측이 요구된다.
920
- Chung, Jong-Kyun
- 韓國宇宙科學會誌 = Journal of astronomy & space sciences
- 17, n.2
- pp.241-248
- 2000
- 원문 바로보기
A groung Fabry-Perot interferometer has been used to measure atomic oxygen nightglow (OI 630.0nm) from the thermosphere (about 250km) at King Sejong station (KSS, geographic: <TEX>$62.22^{\circ}$</TEX>S, <TEX>$301.25^{\circ}$</TEX>E; geomagnetic: <TEX>$50.65^{\circ}$</TEX>S, <TEX>$7.51^{\circ}$</TEX>E), Antarctica. While numerous studies of the thermosphere have been performed on high latitude using ground-based Fabry-Perot interferometers, the thermospheric measurements in the Southern Hemisphere are relatively new and sparse. Therefore, the nightglow measurements at KSS play an important role in extending the thermospheric studies to the Southern Hemisphere. In this study, we investigated the effects of the geomagnetic and solar activities on the thermospheric neutral temperatures that have been observed at KSS in 1989 and 1997. The measured average temperatures are 1400K in 1989 and 800K in 1997, reflecting the influence of the solar activity. The measurements were compared with empirical models, MSIS-86 and semi-empirical model, VSH.