Browsing by Author "Chen, Da-Pan"

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Micro-genetic approach for surface meshing on a set of unorganized points
(2007)
Chen, Da-Pan
;
Hsu, Zhen-Yu
;
Lin, Fang-Pang
;
機械工程學系
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Department of Mechanical Engineering
Surface meshing plays a crucial role in mesh generation. Usually, surface meshing methods in three dimensions generate meshes relying on prescribed patch interpolation. In this study, an approach of surface meshing directly on a set of unorganized points is developed, which consists of a mesh triangulation and a conversion scheme for primary triangular and quadrilateral surface meshes, a high order C-1 surface function reconstruction, and a micro-genetic algorithm (MGA) to smooth the meshes. Practical cases are given to demonstrate its successful performance and its versatility. (c) 2006 Elsevier B.V. All rights reserved.
Preliminary analysis of the forces on the thoracic cage of patients with pectus excavatum after the Nuss procedure
(2008-08-01)
Chang, Pei Yeh
;
Hsu, Zhen-Yu
;
Chen, Da-Pan
;
Lai, Jin-Yao
;
Wang, Chao-Jan
Background. The Nuss procedure corrects pectus excavatum using a pre-bent bar that generates stress on the chest wall. To investigate the biomechanical effects after the Nuss procedure, we designed a three-dimensional finite element analysis model to analyze the distribution of stress and strain induced in the chest wall. Methods. Three patients with pectus excavatum aged 8, 7, and 7 years, were enrolled in this study. The greatest upward displacements of their sternums after the operation were measured from computed tomography images and chest X-ray films. Based on these displacements, we constructed three finite element analysis models for analyzing biomechanical changes in the thoracic cage after the Nuss procedure. Findings. The simulation results indicated that greatest strain occurred at the third through seventh cartilages, especially where they join the sternum and ribs. A high bilateral stress distribution was also found over the backs of the third to the seventh ribs near the vertebral column. Interpretation. The stress and strain induced by the Nuss procedure can be analyzed using our finite element analysis model. Although the stress and strain may have some influence on chest and spine development, a more detailed finite element analysis model is recommended for future study to improve the accuracy of our simulation results. (c) 2008 Elsevier Ltd. All rights reserved.