• Aerospace Industry
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• v.16
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• pp.21-23
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• 1994

세계열강들이 인공위성 발사를 위하여 각종 최신 로켓의 제조 발사경쟁이 한창인 가운데 일본은 지난 2월 1일 H2형 대형 로켓을 발사하여 구미계나 미소 각국과 거의 비슷한 실력을 발휘했다고 보도 했다. 여기 동 H2형 일본 로켓의 성능과 실험 등에 관한 보도 기사를 간추려 본다.

• Bulletin of the Korean Space Science Society
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• 2007.10a
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• pp.71.1-71.1
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• 2007

• Journal of Aerospace System Engineering
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• v.13 no.4
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• pp.26-36
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• 2019

The precise alignment between optical components is required in high-resolution earth observation satellites. However, the misalignment of optical components occurs due to external factors such as severe satellite launch environment and space environment. A satellite optical system with a focus mechanism is required to compensate for the image quality degraded by these misalignments. This study designed, fabricated, aligned precisely, and carried out a performance tests for the image quality of the system. The satellite optical camera performance tests were carried out to check the image quality change by operating the focus mechanism and to analyze the satellite optical system MTF by photographing USAF target using the autocollimator. According to the experimental results, the misalignments can be compensated sufficiently with the focus mechanism. Finally the basic data for re-focusing algorithm of the optical system was obtained through this study.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.10
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• pp.21-26
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• 2003

In this research, the change of coefficient of thermal expansion (CTE) of graphite/epoxy composite laminate under space environment was measured using fiber optic sensors. Two fiber Bragg grating (FBG) sensors have been adopted for the simultaneous measurement of thermal strain and temperature. Low Earth Orbit (LEO) conditions with high vacuum, ultraviolet and thermal cycling environments were simulated in a thermal vacuum chamber. As a pre-test, a FBG temperature sensor was calibrated and a FBG strain sensor was verified through the comparison with the electric strain gauge (ESG) attached on an aluminun specimen at high and low temperature respectively. The change of the CTE in a composite laminate exposed to space environment was measured for intervals of aging cycles in real time. As a whole, there was no abrupt change of the CTE after 1000 aging cycles. After aging, however, the CTE decreased a Little all over the test temperature range. These changes are caused by outgassing, moisture desorption, matrix cracking etc.

• Journal of Space Technology and Applications
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• v.2 no.3
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• pp.206-220
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• 2022

There are various systems that allow humans to safely maintain their space exploration missions and lives in completely different environments, such as the International Space Station, the Moon (the closest celestial body to Earth), and Mars (the only planet in the solar system for manned mission in the 2030s). Among them, when it comes to maintaining the basic breathing of humans, the human life support air management system is a key device system. Such an air management system can be used not only for space exploration but also for undersea bases and submarines on Earth where humans reside. The air management system basically consists of an oxygen generation system, a carbon dioxide removal system, and a harmful substance removal system. In this paper, in order to develop an air management system that can be used in an underwater residential platform, the development requirements of a ground test module to be used as an experimental facility were analyzed.

• Bulletin of the Korean Space Science Society
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• 2011.04a
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• pp.23.3-23.3
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• 2011

이 논문은 인공위성에 장착되어 우주의 궤도상에서 운용되는 대형 반사경의 파면오차 측정과 해석 방법에 대해 실례를 통한 비교 연구 결과를 보여준다. 일반적으로 적용하는 측정방법인 간섭계를 이용한 측정 방법과 파면측정기를 통한 측정방법을 비교하였으며, 반사경 측정을 위한 보조 광학계 및 측정 환경에 의한 영향, 그리고 실제 반사경이 운용될 우주환경 조건에서의 실험과 해석방법 등에 대해 기술한다.

• Aerospace Industry
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• v.70
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• pp.21-23
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• 1999

우리나라 우주기술은 선진국에 비해 초보단계의 수준이나 위성체 구조물 기술, 로켓 구조체 기술 및 위성수신기기 분야 등에서는 상당수준의 기술을 확보하였다. 92년 발사된 실험용 소형과학위성인 "우리별 1호"로 우주개발에 착수한 우리나라는 무궁화위성 1,2호 사업을 통해서 위성통신 시스템 및 관련부품에 대한 요소기술을 확보한 상태이며, 다목적 실용위성 개발사업을 통해서 우주산업 기반기술을 확보한 단계이다. 이번호에서는 오는 12월에 발사예정인 다목적실용위성의 개발과정과 의의에 대해서 알아 보기로 하겠다.

• Bulletin of the Korean Space Science Society
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• 2004.04a
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• pp.29-29
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• 2004

KVN (Korean VLBI Network) 시스템의 점광원이 아닌 천체에 대한 관측 능력과 효율을 알아보기 위하여, AIPS의 화상모의실험 프로그램인 UVCON을 사용하여 가상관측을 수행하였다. Cygnus A 및 M51의 실제 관측 자료와 원과 타원 모양 등 다양한 형태의 가상천체 자료에 대하여 UVCON을 수행하여 가상 UV 데이터를 만든 후, AIPS 표준 화상처리 과정을 거쳐서 각 실험 천체에 대한 clean Image를 생성하였다. 이 논문에서는 대상 천체의 입력 자료와 가상 관측 자료를 비교 분석한 결과를 발표한다. (중략)

• Journal of Space Technology and Applications
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• v.3 no.2
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• pp.165-198
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• 2023

According to the studies recently published through advanced maui optical and space surveillance technologies (AMOS) Conference 2021, LEO conjunction assessment revolves around not on operating satellites but space debris such as rocket bodies and non-operational satellites, hence suggesting a solution through space traffic management. Against this backdrop, the issue of active debris removal (ADR) has emerged to the surface as an international challenge throughout the globe. In step with this, the United Nations General Assembly approved a resolution calling on nations to halt tests of direct-ascent anti-satellites, to which U.S. and twelve other nations included Republic of Korea were original signatories. ADR techniques are also actively being researched in the civil sector, and these commercial services, if successfully developed, could possibly be utilized for military use as well. As such, this paper will help readers' understanding for the current status of ADR techniques, space threat assessments, on-orbit rendezvous and proximity operations by looking at previous cases, reflecting on space-faring nations' ADR techniques and its development probability in relation to space weapons. As a conclusion, this study will propose the needs of developing space propulsion system by understanding Space Maneuver Warfare in preparation for the future space battlefield.

• Journal of the Korean earth science society
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• v.25 no.8
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• pp.784-798
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• 2004

Microscale wind fields were simulated by MUKLIMO at the Naro Space Center, where complicated mountainous terrain and trees exist. In order to test the model's sensitivity with the effects of terrain and trees, experimental simulations were conducted under the various initial conditions. The experiments showed that the effects of trees were more significant on flat surfaces than on mountain cliffs. Based on the results, an actual 10 m level microscale wind field was simulated at the Naro Space Center, which has complicated mountainous terrain. Simulations of wind fields before and after the construction of the launching site were also conducted. It was found that MUKLIMO was of the mesoscale wind fields at the Naro Space Center.