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Segmentation of 3D Mesh Models Based on Conformal Factor
Yang Jun,Wang Maozheng,Yan Han 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.9
The segmentation technique of 3D mesh models plays a key role in comprehending and processing digital geometric models. A new segmentation algorithm for 3D mesh models based on conformal factor and k-means clustering is proposed to deal with the existing problems in segmentation methods, which includes a lack of semantic information and low performance in segmentation results. It is easy to obtain an effective segmentation results with semantic information since the conformal factors carry global feature information of the model. Firstly, the discrete Gaussian curvatures of each vertex are figured out. Secondly, the conformal factors are calculated by employing Laplace-Beltrami operators. Finally, the clustering of meshes is realized by modified k-means clustering algorithm. Experimental results show that the proposed algorithm not only can achieve meaningful segmentation of 3D models, but also has good anti-jamming performance caused by pose variation of the model.
A Numerical Study on Steam Flow and Beat Transfer of Pannier-arrangement Condensers
Hou Pingli,Yu Maozheng The Korean Society for Energy 2005 에너지공학 Vol.14 No.2
Pannier-arrangement condensers are usually adopted in the turbine generator units of combined cycle power plants. Optimization of operating performance and economy is an important goal, which requires accurate understanding of flow and heat transfer effects in the condenser. The tube bundle arrangement and steam flow behaviors of pannier-arrangement condensers are very different from those of common condensers. The physical model for existing numerical simulation program of condenser is refined by constructing the correlations for flow resistance and condensation heat exchange coefficient in which the influences of steam flow direction are considered according to available experimental data. The adaptability of the developed physical model and simulation program of pannier-arrangement condenser is verified with available experimental data.