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문두환,김병철 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
We propose an approach for the three-dimensional solid reconstruction of a human bone using medical images obtained from Computed tomography (CT). CT images of the female from the Visible Korean (VK) data set, which were constructed in the VK human project, were used. First, the femur and hip bone images were segmented from the original image. The segmented images were then smoothed by a Gaussian filter, and a triangular mesh was generated using the marching-cubes algorithm. To reduce the triangles in the generated mesh and eliminate aliasing, a triangle decimation algorithm using the quadric error metric method was adopted. To reconstruct the surfaces, the triangles in the mesh were interpolated with cubic triangular Bézier patches. The patches were then converted to a solid by stitching them. Finally, it is demonstrated that the proposed approach can be used in a practical design environment by importing the reconstructed solids into a commercial computer-aided design software.
문두환,경진범,이예린,성미혜,이용우 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7
The specific rates of solvolysis of 1- naphthyl chloroformate (1-NaphOCOCl, 1) and 2-naphthyl chloroformate (2-NaphOCOCl, 2) have been determined in a wide range of solvents at 2.0 and 10.0 ^oC. These give a satisfactory correlation over the full range of solvents when the extended (two-term) Grunwald-Winstein equation is applied. The sensitivities (l and m-values) to changes in solvent nucleophilicity (N_T) and solvent ionizing power (Y_(Cl)) are similar to those reported previously for solvolysis of phenyl chloroformate, which has been suggested to proceed through an addition-elimination mechanism with the addition step being rate determining. For four representative solvents, studies were made at several temperatures and activation parameters determined. These observations were also compared with those previously reported for phenyl chloroformates and naphthoyl chlorides.