• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.89-91
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• 2014

전자해도는 IHO의 S-57 ENC Product Specification에 따라 해양의 모든 지형정보를 포함하는데, 해양의 지형정보에는 해안선, 등심선, 수심 그리고 항로표지 등이 포함된다. 전자해도가 포함하는 정보는 수로측량을 통해 제작된 측량원도를 이용하여 제작하는데, 대용량의 측량원도 자료는 매우 조밀하고 양이 방대하여 전자해도에 반영하기 위해서는 수심 정보를 발췌하여야 한다. 국립해양조사원에서는 측량원도의 정보를 발췌하기 위한 방안으로 수심편수규칙을 정하고 있으며, 편수 단계와 편수 후 검증 단계를 거쳐 전자해도의 수심 정보를 제작하고 있다. 그러나 편수와 편수 후 검증은 모두 수작업으로 진행하고 있어, 보다 효율적이고 정확한 방법으로 수심 편수 결과를 검증하기 위한 방안이 필요하다. 본 논문에서는 수심 편수 결과를 규칙에 맞도록 편수되었는지를 평가하는 방안을 연구하였다. 각 편수된 수심을 들로네 삼각분할 기법에 따라 영역을 삼각분할하고, 측량원도의 수심 정보와 삼각분할 된 삼각형과 비교 분석하여 수심이 수심편수규칙을 준수하는지를 비교분석하였다.

• Communications of Mathematical Education
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• v.31 no.3
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• pp.257-277
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• 2017

The purpose of this research is divide into two kinds. First, develop the mathematical modeling program for mathematically gifted students focused on Voronoi diagram and Delaunay triangulation, and then gifted teachers can use it in the class. Voronoi diagram and Delaunay triangulation are Spatial partition theory use in engineering and geography field and improve gifted student's mathematical connections, problem solving competency and reasoning ability. Second, after applying the developed program to the class, I analyze gifted student's core competency. Applying the mathematical modeling program, the following findings were given. First, Voronoi diagram and Delaunay triangulation are received attention recently and suitable subject for mathematics gifted education. Second,, in third enrichment course(Student's Centered Mathematical Modeling Activity), gifted students conduct the problem presentation, division of roles, select and collect the information, draw conclusions by discussion. In process of achievement, high level mathematical competency and intellectual capacity are needed so synthetic thinking ability, problem solving, creativity and self-directed learning ability are appeared to gifted students. Third, in third enrichment course(Student's Centered Mathematical Modeling Activity), problem solving, mathematical connections, information processing competency are appeared.

• Journal of Aerospace System Engineering
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• v.18 no.3
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• pp.17-26
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• 2024

Aircraft engines are exposed to high temperatures, high pressures, and stress caused by the rotation of the turbine shaft during flight. These loads can result in microcracks both on the inside and outside surfaces of the structure. Consequently, this can lead to structural defects and negatively impact the lifespan of the parts. To proactively prevent these defects, a finite element analysis is carried out to identify cracks. However, this process is time-consuming and requires significant effort due to the repetitive nature of crack modeling. This study aims to develop a crack modeling method based on the finite element model. To achieve this, the Constrained Delaunay Triangulation (CDT) technique is employed to triangulate the space while considering limitations on point connections. The effectiveness of this method is validated by comparing stress intensity factors for semi-elliptical cracks in plates and cylindrical vessels. This approach proves to be a valuable tool for crack analysis studies.