• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.13 no.2
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• pp.125-133
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• 1995

The geoidal heights of a country may be computed from astrogedetic, gravimetric or satellite data. In this paper, the geoid models to the Bessel ellipsoid(KGM95-A) have been determined by the astrogedetic method, which is surface fitting techniques using deflections of the vertical and geoid height constraints. Transformation equations and the gravimetric geocentric geoid(KGM93-C) were applied to obtain the geoid height referred to the Tokyo Datum of the Korean geodetic network, the comparison of the astrogedetic results and discussions of the geoid information were added.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.3
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• pp.237-247
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• 2011

As of 2011, 72 Permanent GPS Stations are installed to control DGPS reference points by the National Geographic Information Institute in South Korea. As the center of the Earth's mass continues to move, the coordinates of the permanent GPS stations become inconsistent over time. Thus, a reference frame using a set of coordinates and their velocities of a global network of stations at a specific period has been used to solve the inconsistency. However, the relative movement of the permanent GPS stations can lower the accuracy of GPS relative positioning. In this research, we first analyzed the data collected daily during the past 30 months at the 40 permanent GPS stations within South Korea and the 5 IGS permanent GPS stations around the Korean Peninsula using a global network adjustment. We then calculated the absolute and relative amount of movement of the GPS permanent stations. We also identified the optimum renewal period of the permanent GPS stations considering the accuracy of relative GPS surveying. Finally, we developed a Korean a Korean crustal movement model that can be used to improvement of accuracy.

• The Journal of Korean Philosophical History
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• no.35
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• pp.361-384
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• 2012

In this study, I considered an important characteristic of system in pre-Qin philosophy that accomplished all categories with the best value. I pointed out misreading that thinkers separated fazhi-theory from shu zhi- theory of Hanfeizi. So I analyzed argument causes of Hanfeizi's shuzhi-theory through epistemology, ethics, military theory. And I proved that understanding the actual conditions and essences of things assured the objective bases on a reward and punishment. There are three things about argument bases of Hanfeizi's shuzi-theory. First, the epistemology that analyzes the actuality of a thing and that endows a duty matching the natural character of a thing. Second, ethics that isn't restricted by a fixed form and is in harmony with a law and that reveals a selfish character freely. Third, military theory, that is a trick that analyzes the quality of a case and a thing accurately. Above the three show that there are an objective basis of reward and punishment and an fair execution about a law in Hanfeizi's shuzhi-theory.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.659-660
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• 2023

코로나19의 엔데믹 선언으로 일상생활이 코로나19 이전으로 빠르게 되돌아가고 있다. 또한 소비자들의 취향이 세분화되고 여가생활의 트렌드가 급속하게 변화하면서 장소 추천 플랫폼의 이용이 증가하고 있다. 그러나 기존 장소, 코스 추천 앱의 경우 자체적으로 제작한 추천 콘텐츠로 인해 제공되는 데이터의 범위가 제한적이고 업데이트가 느리다. 이러한 문제를 해결하기 위해, 본 연구에서는 사용자가 선호하는 장소를 기반으로 테마별 카테고리로 나들이 장소를 랜덤으로 추천해 준다. 또한 추천 장소들을 기반으로 최적의 동선을 계산한 코스를 제공해주는 동시에 빠르고 쉽게 계획할 수 있는 맞춤형 나들이 추천 앱을 개발하였다.