• Journal of The Korean Association For Science Education
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• v.35 no.2
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• pp.179-197
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• 2015

Based on the importance of spatial thinking to understand celestial motion, this study aimed to investigate how spatial thinking was treated in astronomy classes. For this study, we analyzed four elementary teachers' science classes about the unit 'solar systems and stars' in 5th grade in terms of spatial thinking. The results showed that sharing perspectives and orientation explicitly between a teacher and students were important for students to understand celestial motion. Providing the earth-based and the space-based viewpoints simultaneously were helpful for students' understanding of celestial motion. Based on these results, this study suggested that clarifying the viewpoint and orientation, showing the earth-based and the space-based viewpoint simultaneously, and reorganizing the relative units of astronomy based on celestial motion and spatial thinking.

• Journal of the Korean earth science society
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• v.30 no.3
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• pp.381-397
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• 2009

The Modem Geodesy monitors physical and geometrical shape and motion of the Earth and, more importantly, its temporal variations with unprecedented precision. It provides accurate and stable reference frames for Earth observations in the Space era. Furthermore, with an aid of interdisciplinary approaches, it also traces the causes of the variations in shape and motion of the Earth and eventually contributes to a better understanding of the Earth system. The International Association of Geodesy (IAG) has established the Global Geodetic Observing System (GGOS) to integrate the multitude of geodetic tools and tried to contribute to the management of global environmental changes as a partner of the Global Earth Observation System of Systems (GEOSS). Here we introduce the contribution of geodesy to the various fields of Earth Science by focusing on GGOS and encourage interdisciplinary researches.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.3
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• pp.327-331
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• 2010

The 21.4-22.0GHz frequency band is used to broadcast satellite services in Region 1 and Region 3 in frequency distribution area. The use of this frequency band is according to the provision of the resolution 525 of WRC-03, this frequency band broadcasting service system transmits broadband radio-frequency signals. The trend of the Satellite launching plans for an using this frequency band is growing in worldwide. This frequency band requires fairly more transmit power than the Ku-band because of the rain attenuation of this frequency band is very extreme. An appropriable sharing criteria is required for this broadcast service to be operational.

• Journal of the Korean earth science society
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• v.39 no.1
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• pp.46-52
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• 2018

This paper is to study the development of three dimensional Digital Surface Model (DSM) using photogrammetry technique based on self-developed Drone (Unmanned Aerial Vehicle (UAV)). To develop DSM, we selected a study area in Jeju island and took 24 pictures from the drone. The three dimensional coordinates of the photos were made by Differential Global Positioning System (DGPS) surveying with 10 ground control points (GCP). From the calculated three dimensional coordinates, we produced orthographic image and DSM. The accuracy of DSM was calculated using three GCPs. The average accuracy of X and Y was from 8.8 to 14.7 cm, and the accuracy of Z was 0.8 to 12.4 cm. The accuracy was less than the reference accuracy of 1/1,000 digital map provided by National Geographic Information Institute (NGII). From the results, we found that the self-developed drone and the photogrammetry technique are a useful tool to make DSM and digital map of Jeju.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.16 no.2
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• pp.299-309
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• 1998

The national coordinate system is an essential component for a geographic/land information system, since it provides the spatial reference for expressing position information. The national mapping of Korea has been based on 3-different meridians on the Gauss-Schreiber projection in year 1910s, later this was changed to the Gauss-Kruger projection. Existing map coordinate systems maintaining the national land survey project on 1910s, have some structural shortcomings of unknown computational procedures and projection methods. In this paper, the problems of the map coordinates usage and of longitudes origin shift(10.405") and their solutions are investigated. Also, this study discusses the issues involved in choosing coordinate system for digital mapping and their applications as a basis for spatial data management. The foreign country's coordinate systems are reviewed and the elements to realize a new unified grid coordinate system is proposed. The Transverse Mercator projection with a central meridian of $127^\circ\;30'$, scale factor 0.9996, and GRS80 ellipsoid, is selected in Korean peninsula.sula.

• The Optical Journal
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• s.97
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• pp.62-66
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• 2005

본 고는「특집: 여러 가지 초정밀기술을 응용한 옵토메카트로닉스부품화기술」이라는 주제로 일본 광기술콘택트지 (Vol. 42, No. 12(2004년), 637~641쪽)에 게재됐던 카사이 도시오(河西敏雄)씨가 기고한 내용을 번역, 정리한 것으로 초정밀기술과 옵토메카트로닉스부품의 현황과 과제에 관해 간단히 논하였다. 산업계에서 신문보도등에 의하면 교또의정서의 발효는, 러시아의 기준에 의해 2005년 2월경이라고 한다. 지금까지 앞서간다고 여겨져 왔던 엄한 CO가스의 삭감규제가 드디어 아주 가깝게 대두되었다. 환경문제로 지구온난화를 조금이라도 억제하려는 기업 노력이 추진되어 왔지만, 금후의 초정밀기술 및 옵토메카트로닉스부품·시스템에 대해서도 이를 염두에 둔 새로운 기술전개가 시작될 것으로 예상된다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2003.04a
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• pp.575-580
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• 2003

KOMPSAT-1 위성의 EOC영상은 위성에서 지구를 촬영하는 동안 발생하는 영상 왜곡을 포함하고 있다. 본 연구는 EOC영상의 영상왜곡을 보정하기 위하여 수치지도를 이용하는 정밀기하보정에 대하여 연구한다. 정밀기하보정 과정은 수치지도와 EOC영상의 좌표계를 통합하는 과정을 거쳐 오버레이를 만들어 수치지도의 삼각점을 기준으로 위성영상에서 GCP를 선택하고, 이 GCP를 이용하여 위성 영상을 딜로니 삼각형들의 Mesh형태로 변환하여 모든 딜로니 삼각형을 리샘플링하는 과정을 거쳐 보정된 EOC영상을 얻는다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.377-378
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• 2000

1957년 국제지구물리관측년 (IGY：International Geophysical Year) 계획 이래 대기중의 오존전량(total ozone)과 대기중의 수직 층별 오존량의 측정을 위해 본격적으로 전세계적 오존관측망이 운영되기 시작하였다. 이 시점을 기준으로 오존에 관한 연구는 전지구적인 오존전량의 감소경향과 남극상공 성층권에서의 오존량 파괴에 집중되어왔다. 그러나 대기중 오존의 행태를 더 정확하게 이해하고, 각각의 대기권이 서로의 오존량에 미치는 영향을 이해하기 위해서는 대기중 오존의 수직분포에 관한 연구가 대단히 중요하다. (중략)

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2003.04a
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• pp.485-488
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• 2003

본 연구는 건설공사의 경계점 및 구조물의 기준점을 TS를 활용하여 현장 측지좌표체제를 탈피지적좌표로 전환 관리하여 토지경계분쟁 문제의 사전제거 및 공사품질시공관리에 향상을 기하고자 연구하였다.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2010.04a
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• pp.43-44
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• 2010

We present the analysis of space geodetic technique observation, Satellite Laser Ranging (SLR), to LAGEOS1 and LAGEOS2 for the definition of the Terrestrial Reference Frame (TRF). The data were analyzed in 7day arcs during about 9 years (2000/01/10 ~ 2008/12/29) using NASA Goddard's GEODYN/SOLVE II software. The comparison of the coordinates between ITRF2005 and TRF solutions determined in this work shows that there is no significant bias.