• Journal of Astronomy and Space Sciences
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• v.29 no.3
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• pp.305-313
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• 2012

We conducted thermal analyses and cooling tests of the space observation camera (SOC) of the multi-purpose infrared imaging system (MIRIS) to verify passive cooling. The thermal analyses were conducted with NX 7.0 TMG for two cases of attitude of the MIRIS: for the worst hot case and normal case. Through the thermal analyses of the flight model, it was found that even in the worst case the telescope could be cooled to less than $206^{\circ}K$. This is similar to the results of the passive cooling test (${\sim}200.2^{\circ}K$). For the normal attitude case of the analysis, on the other hand, the SOC telescope was cooled to about $160^{\circ}K$ in 10 days. Based on the results of these analyses and the test, it was determined that the telescope of the MIRIS SOC could be successfully cooled to below $200^{\circ}K$ with passive cooling. The SOC is, therefore, expected to have optimal performance under cooled conditions in orbit.

• Bulletin of the Korean Space Science Society
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• 2000.04a
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• pp.43-43
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• 2000

No Abstract, See Full Text

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

• Bulletin of the Korean Space Science Society
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• 2000.04a
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• pp.49-49
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• 2000

No Abstract, See Full Text

• Bulletin of the Korean Space Science Society
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• 2000.04a
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• pp.42-42
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• 2000

No Abstract, See Full Text

• Bulletin of the Korean Space Science Society
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• 2004.10b
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• pp.97-97
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• 2004

• Journal of Space Technology and Applications
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• v.2 no.2
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• pp.169-186
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• 2022

In this article, Russia's space threat assessment and space warfare in the Russia-Ukraine war (Russian invasion of Ukraine) were analyzed and summarized. Considering the probability that commercial satellites will also be potential targets of space warfare, it is suggested that not only military satellites but also commercial satellites develop and apply space technology that can be applied equally to space threats when developing space technology. Necessary space technologies is listed.

• Korean Journal of Optics and Photonics
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• v.22 no.6
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• pp.262-268
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• 2011

MIRIS(Multi-purpose Infra-Red Imaging System) is the main payload of the STSAT-3(Korea Science and Technology Satellite. 3), which is being developed by KASI(Korea Astronomy & Space Institute). EOC(Earth Observation Camera), which is one of two infrared cameras in MIRIS, is the camera for observing infrared rays from the Earth in the range of $3{\sim}5{\mu}m$. The optical system of the EOC is a Cassegrain prescription with aspheric primary and secondary mirrors, and its aperture is 100mm. A ring type flexure supports the EOC primary mirror with pre-loading in order to withstand expected load due to the shock and vibration from the launcher. Here we attempt to use the same mechanism by which a retainer supports the lens. Through opto-mechanical analysis it was confirmed that the EOC primary mirror is effectively supported.

• Bulletin of the Korean Space Science Society
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• 2000.04a
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• pp.50-50
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• 2000

No Abstract, See Full Text

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.37.1-37.1
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• 2008

Space Science and Technology Laboratory at Kyung Hee University developed an 80cm Nasmyth telescope with the joint work of Space & Astronomy, Inc. It was set up at Muju county public astronomical observatory in Jeonlabuk-Do. Nasmyth focus system was selected for the telescope to use two focal points by a rotatable tertiary mirror. Focal ratios of the telescope are f10, f5 respectively. Support of the main mirror is made with Lasalle-system. This system uses 24-points in the back side of the mirror that are all resting on small counter-weights and side support is 10-points Boll link Flexible type with 2 Lasalle type. The mount is wheel & disk type Alt-Azimuth design using DC-servo motors. External high accuracy encoder has 47,600 sine-waves/rot. These encoders are used to make real-time corrections on all gearing errors.