• 한국항공우주법학회:학술대회논문집
• /
• 2008.05a
• /
• pp.235-255
• /
• 2008

On the basis of briefing the development of space technology and activity in China, this essay analysis the characteristics and main rules of the space regulations in China, and proposes how to advance and perfect the space law in China further. The beginning of space technology in China can be traced back to 1956. After more than fifty years development phased in three periods of technology preparation, technology experimentation and engineering application, the achievement of space technology and activity in China is noticeable in the world. But the space legislations in China, which is mainly composed as ministerial rules, orders, and regulatory documents, are really lagged far behind the space activity, and can not adapt to the quick and comprehensive development of space activity. Therefore, national space law must be passed in time.

• The Bulletin of The Korean Astronomical Society
• /
• v.34 no.1
• /
• pp.126.2-126.2
• /
• 2009

• Journal of Electrical Engineering and Technology
• /
• v.13 no.2
• /
• pp.1030-1041
• /
• 2018

The aim of this paper is to design a centrifugal deformation error compensation method with guaranteed performance that allows angular velocity measurement of the magnetically suspended sensitive gyroscopes (MSSGs). The angular velocity measurement principle and the structure of the MSSG are described, and the analytical model of errors caused by MSSG rotor centrifugal deformation is established. Then, an on-line rotor centrifugal deformation error compensation method based on measurement of rotor spinning speed in real-time has been designed. The common issues caused by centrifugal deformation of spinning rotors can be effectively resolved by the proposed method. Comparative experimental results before and after compensation demonstrate the validity and superiority of the error compensation method.

• The Bulletin of The Korean Astronomical Society
• /
• v.24 no.2
• /
• pp.120-120
• /
• 1999

• Journal of The Korean Astronomical Society
• /
• v.54 no.6
• /
• pp.171-182
• /
• 2021

The lack of short baselines, referred to as the short-spacing problem (SSP), is a well-known limitation of the performance of radio interferometers, causing a reduction of the flux detected from source structure on large angular scales. The very large number of antennas operated in the Atacama Large Millimeter/sub-millimeter Array (ALMA) generates situations for which the impact of the SSP takes a complex form, not simply measurable by a single number, such as the maximal recoverable scale. In particular, extended antenna configurations, complemented by a small group of closeby antennas at the centre of the array, may result in a double-humped baseline distribution with a significant gap between the two groups. In such cases one should adopt as the effective maximal recoverable scale the one associated with the extended array and use only the central array to recover missing flux, as one would do with single dish or ACA (Atacama Compact Array) observations. The impact of the missing baselines can be very important and may easily be underestimated, or even overlooked. The present study uses ALMA archival data of the ²⁹SiO(8-7) line emission of the AGB star W Hydrae for a demonstration. A critical discussion of the reliability of the observations away from the star is presented together with comments of a broader scope. Properties of the circumstellar envelope of W Hya within ~15 au from the star, many of which are not mentioned in the published literature, are briefly described and compared with R Doradus, an AGB star having properties very similar to W Hya.

• Bulletin of the Korean Space Science Society
• /
• 2000.10a
• /
• pp.54-54
• /
• 2000

No Abstract, See Full Text

• Bulletin of the Korean Space Science Society
• /
• 2007.10a
• /
• pp.50-50
• /
• 2007

• Bulletin of the Korean Space Science Society
• /
• 2002.05b
• /
• pp.37.1-37
• /
• 2002

• Bulletin of the Korean Space Science Society
• /
• 2006.04a
• /
• pp.44-44
• /
• 2006

• Journal of The Korean Astronomical Society
• /
• v.38 no.2
• /
• pp.69-72
• /
• 2005

The FIMS (Far-ultraviolet IMaging Spectrograph; also known as SPEAR, Spectroscopy of Plasma Evolution from Astrophysical Radiation) is the primary payload of the STSAT-1, the first Korean science satellite, which was launched in September, 2003. The FIMS performs spectral imaging of diffuse far-ultraviolet emission with the unprecedented wide field of view and the relatively good spectral resolution. We present far-ultraviolet spectral observations of highly ionized interstellar medium including supernova remnants, superbubbles, soft X-ray shadows, and the molecular hydrogen fluorescent emission lines. The FIMS has detected He II, C III, 0 III, O IV, Si IV, O VI, and $H_2$ fluorescent emission lines. The emission lines arise in shocked or thermally heated and in photo-ionized gases. We present an overview of the FIMS instrument and its initial observational results.