• Journal of the Korean Geotechnical Society
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• v.38 no.9
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• pp.19-33
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• 2022

Planarity geotechnical exploration missions were actively performed during the 1970s and there was a period of decline from the 1 990s to the 2000s because of budget. However, exploring space resources is essential to prepare for the depletion of Earth's resources in the future and explore resources abundant in space but scarce on Earth, such as rare earth and helium-3. Additionally, the development of space technology has become the driving force of future industry development. The competition among developed countries for exoplanet exploration has recently accelerated for the exploration and utilization of space resources. For these missions and resource exploration/mining, geotechnical exploration is required. There have been several missions to explore exoplanet ground, including the Moon, Mars, and asteroids. There are Apollo, LUNA, and Chang'E missions for exploration of the Moon. The Mars missions included Viking, Spirit/Opportunity, Phoenix, and Perseverance missions, and the asteroid missions included the Hayabusa missions. In this study, space planetary mineral resource exploration technologies are explained, and the future technological tasks of Korea are described.

• Journal of Space Technology and Applications
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• v.2 no.1
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• pp.52-65
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• 2022

Korea is near close the success on the indigenous launch vehicle KSLV-2 after the second test launch during the second half of 2022, and the satellite development has been already in the level of advanced country. After the such mature of satellite and launch vehicle technologies, Korea's space development main theme should be 'Space Exploration and Space Application', and paradigm should be changed from 'Hardware' to 'Scientific/Technological Mission', from 'Unmanned' to 'Manned'. Korea's prime space strategy should be the direction of expansion of space industry, creation of employment and secure the key technologies, improvement of convenience and safety of people. For the purpose it is necessary to start 'Manned Space Development' such that participation to 'Artemis and Gateway Program' in 20s' and manned Mars exploration in 30s' which would be carried out by means of global international cooperation, and which could be a good opportunity to explore the new area of space development and upgrade national technology capability. Taking advantage of this opportunity, it is required for Korea to join the international programs through developing indigenous challenging, sustainable Korean mission and hardware. Also selection of the 2^nd Korean Astronaut could draw national attention, especially could give dreams to young generation. Participation to the Artemis program could be the opportunity of entering the major space fairing nation and boosting up national pride. In this study we survey and analyze the Artemis Program in detail, and in conclusion we suggest the strategy of Korea's participation to the Artemis Program.

• Journal of Astronomy and Space Sciences
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• v.21 no.2
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• pp.153-166
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• 2004

Interplanetary trajectories using the gravity assists are studied for future Korean interplanetary missions. Verifications of the developed softwares and results were performed by comparing data from ESA's Mars Express mission and previous results. Among the Jupiter exploration mission scenarios, multi-planet gravity assist mission to Jupiter (Earth-Mars-Earth-Jupiter Gravity Assist, EMEJGA trajectory) requires minimum launch energy ($C_3$) of 29.231 $Km^2$/$S^2$ with 4.6 years flight times. Others, such as direct mission and single-planet(Mars) gravity assist mission, requires launch energy ($C_3$) of 75.656 $Km^2$/$S^2$ with 2.98 years flight times and 63.590 $Km^2$/$S^2$ with 2.33 years flight times, respectively. These results show that the planetary gravity assists can reduce launch energy, while EMEJGA trajectory requires the longer flight time than the other missions.

• Aerospace Engineering and Technology
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• v.13 no.1
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• pp.120-128
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• 2014

Adventure of human race for space exploration is toward outer region of solar system. Recently the main targets of space explorations are becoming mainly the Mars, Venus and asteroids instead of the Moon which was the popular place human wants to explore. There are several technical challenges as spacecraft goes far and far away from the Earth, and among them communication protocol is one of the most challenging problems. In this paper, several international technical trends regarding deep space communication protocol technologies in an aspect of software implementation is presented. It is expected that these references are helpful for the development of the lunar orbiter pathfinder which is planned to be launched in 2017.

• Korean Journal of Remote Sensing
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• v.38 no.6_1
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• pp.1015-1023
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• 2022

The Entry-Descent-Landing process of a lander involves many environmental and technical challenges. To solve these problems, recently, terrestrial relative navigation (TRN) technology has been essential for landers. TRN is a technology for estimating the position and attitude of a lander by comparing Inertial Measurement Unit (IMU) data and image data collected from a descending lander with pre-built reference data. In this paper, we present a method for generating descent dataset and extracting landmarks, which are key elements for developing TRN technologies to be used on Mars. The proposed method generates IMU data of a descending lander using a simulated Mars landing trajectory and generates descent images from high-resolution ortho-map and digital elevation map through a ray tracing technique. Landmark extraction is performed by an area-based extraction method due to the low-textured surfaces on Mars. In addition, search area reduction is carried out to improve matching accuracy and speed. The performance evaluation result for the descent dataset generation method showed that the proposed method can generate images that satisfy the imaging geometry. The performance evaluation result for the landmark extraction method showed that the proposed method ensures several meters of positioning accuracy while ensuring processing speed as fast as the feature-based methods.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.3
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• pp.240-246
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• 2016

The hottest news and achievements of space science and research in recent years may be NASA Curiosity rover's exploration (2013) of Mars, China Chang'e 3's exploration (2013) of Moon, ESA Rosetta's exploration (2014) of Comet 67P/Churyumov-Gerasimenko, and NASA New Horizons' exploration (2015) of Pluto, which are very astonishing achievement since such a deep space journey was possible with current technology. In contrast the wonderful cruise and navigation technologies evolution of explorer in deep space, there are no remarkable changes in deep space data communication, it is still in conservative area, of which much changes are reluctantly accepted so far. But there are some movements of deep space exploration in order to allow ground brilliant technologies to deep space. One of those experiments is internet, whose main topic of this paper. In this paper, we will present the analysis of effectiveness of solar system internet to deep space exploration.

• Bulletin of the Korean Space Science Society
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• 2006.10a
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• pp.39-39
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• 2006

• The Magazine of the IEIE
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• v.11 no.3
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• pp.47-58
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• 1984

본지 2, 3월호에서 구술한 블록부호(선형부호 및 순회부호)에 이어 이번 호에서는 대합부호, 즉 길쌈부호(convolutional code)에 대해 기술하고자 한다. 길쌈부호는 그 부호법 중 역차 및 최근부호에 있어 그 구조적 표현이 대수학적(algebraic)이라기 보다는 오히려 위상학적(topological)이라는 점에서 주목할만한 특징을 지니고 있다. 길쌈부호를 응용한 예로는 1977년 NASA에 실시한 Voyager 우주탐사계획을 들 수 있다. 화성(Mars), 목성(Jupiter) 및 토성(Saturn) 등에서 일연의 과학 data 수집을 목적으로 했던 이 계획은 NASA소관 California공대 JPL연구소에서 개발한, 기억소자가 6단인(3, 1) 길쌈부호의 CODEC을 사용하였다.

• The Science & Technology
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• no.7 s.410
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• pp.104-107
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• 2003

사스치료제 개발에 '청신호'/ 중국, 대만과학자, 공동연구에 합의/ 미 과학자들, 이공계 인력양성 촉구/ '과학인력 공급에는 대학의 노력이 필요' / 구소련의 핵물질 안전처리/ 이탈리아 과학정책 큰 혼란/ 스위스 과학예산 130억달러 증액/ MIT, 인도와 과학협력 종식/ '지구보건사업' 아이디어 공모/ 러시아 북극연구 재개/ 프랑스 화성탐사계획 취소/ 첨단진단방법 개발에 3천만 달러기증/ 가족에 통보없이 사자장기 활용

• Proceedings of the KSRS Conference
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• 2007.03a
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• pp.167-170
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• 2007

연안 김 양식장의 효과적 관리를 위해서는 실제 시설량의 조사가 펼요하며 인공위성을 이용한 방법이 가장 효과적이다. 본 연구에서는 스펙트로미터에 의한 해수 및 김 양식장 시설에 대한 광 측정을 통하여 파장별 특성을 조사하였다 10m의 해상도를 갖고 있는 SPOT-5 다중분광영상을 사용하였으며，김 양식장의 자동탐지알고리듬의 개발을 위하여 경기도 화성시 제부도 남방해역에 대한 2005년도 영상을 사용하였다. 김 양식장을 추출하기 위하여 우선 3밴드 영상의 분광특성을 이용한 밴드차(Band difference) 영상을 작성하여，두 가지 방법(형태학적 처리기법 및 Canny 에지 탐지기법)으로 처리를 한 후，두 결과를 합성하여 라벨령함으로써 탐지율을 극대화하였다 양식장 시설 현황 조사 결과는，정부에서 전체 생산량을 조절할 수 있게 하며，양식업자가 좋은 수확을 달성하는데 도움이 될 수 있을 것이다.