• 발명특허
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• v.5 no.11 s.57
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• pp.18-20
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• 1980

코페르니쿠스의 보수적요소를 거부하고 근본적으로 태양중심체계를 바꾸어 놓은 것은 케플러 (Gohannes Kepler, 1571-1630)였다. 그는 튀빙엔에서 신학을 공부했으나 천문학으로 관심을 돌렸다. 그에게 천문학을 가르친 매스틀린(Mastlin)은 지구중심우주체계를 강의했지만 사석에서는 코페르니쿠스가 맞는다고 했다. 그래서 케플러는 이미 학생시절에 열렬한 코페르니쿠스주의자가 되어 있었다. 케플러는 루터파 신교도로서 우주에서 삼위일체를 보았다. 즉 태양은 성교, 별들은 성자, 중간의 공간은 성신이었다. 그는 우주가 살아 있으며 행성들과 지구는 영혼을 가지고 있다고 믿었다. 이것은 아마도 당시에 크게 유행한 루터파 신비주의의 영향인 듯하다. 케플러는 철저한 피타고라스${\cdot}$플라톤주의자였다. 그는 우주가 수학적 조화를 이루고 있고, 신은 위대한 기하학자이며, 인간은 신의 이미지를 따서 만들어졌다고 보았다. 따라서 인간은 수학을 통해 우주를 이해할 수 있다는 생각이었다.

• Journal of Gifted/Talented Education
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• v.21 no.2
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• pp.575-589
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• 2011

The aims of this study are to investigate how Kepler found a scientific problem for the retinal image theory and to investigate how the science high-school students respond when the same situation is applied to them. And their results was compared with general high-school students' results. Kepler found the scientific problem in the eye vision through the critical analysis of contemporary theories of vision, based on his relevant knowledge of optics. When we applied the same situation to the Korean science high school and general high-school students, only a few of science high-school students found the scientific problem as same as Kepler's finding. From the results, it is suggested that in development of creativity teaching material, the situations like Kepler's problem finding need to be included in the programs.

• Journal of the Korean earth science society
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• v.33 no.1
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• pp.11-31
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• 2012

Kaula's theory of satellite orbit and Kepler's law are re-visited. All the mathematical steps of derivation are thoroughly shown including the ones, which had been omitted in Kaula's original publication. Particularly in evaluations of the 15 independent Lagrange brackets, simplicity and clarity are attained by using orthogonal property of transformation matrix. Explanations of important physical concepts are included as well in the midway of derivation. One conceptual blunder of Kaula's is corrected.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.30 no.7
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• pp.123-129
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• 2002

This paper reveals determination of orbital elements of the satellite using GPS data collected by the low-end GPS receiver installed at KITSAT-3 which is a small scientific experimental satellite of Korea and launched in May 1999. An extended Kalman filter is designed for a forward estimation of real-time 3-dimensional position and velocity, and a smoother is used for a backward post-processing estimation of the same states. After finishing estimation of position and velocity, the corresponding orbital elements are estimated. Finally, the result of each orbital element is analyzed.

• Journal of Korean Philosophical Society
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• v.148
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• pp.157-181
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• 2018

The aim of this essay is to identify elements of methodologies to investigate the development of Newtonian dynamics. This methodology involves the transformation and synthesis of preceding theories. My essay attempts to confirm my assertion by analyzing historical case of Newton's discovery of his dynamics. While discovering his mechanistic theory, Newton reconstructed theoretical concepts and structures of intellectual predecessors, such as Aristotle, Descartes, Galileo, and Kepler. Newton's synthesis was possible only after carefully reconstructing the appropriate and useful ideas of previous natural philosophers' ideas. As a result, Newtonian dynamics are completed with these modified and integrated concepts incorporated into Newton's law of motion and space-time concepts. This study consists of two parts. First, Lakatos' research program has been applied in order to analyze the structure of Newtonian dynamics. Second, the aforementioned methodologies of discovery are distilled from the case study.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.27 no.2
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• pp.119-127
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• 2009

Even though there are next generation Global Navigation Systems in development, only GPS and GLONASS are currently available for satellite positioning. In this study, GLONASS orbits were predicted using Keplerian elements in almanac and the orbit equation. For accuracy validation, predicted orbits were compared with precise ephemeris. As a result, the 3-D maximum and RMS (Root Mean Square) errors were 155.4 km and 56.3 km for 7-day predictions. Also, the GLONASS satellite visibility predictions were compared with real observations, and they agree perfectly except for several epochs when the satellite signal was blocked nearby buildings.