http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Research on the Flame Simulation Method Based on the Particle System
Xumin Liu,Zilong Duan,Dawei Qian,Xiaojun Wang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
In reality, flame is a common fluid scene. In this paper, we simulated flame by using improved particle system and detail the properties and changes of particles in the model. We realized a realistic color change and dynamic flickering flame characteristics. We used texture mapping method to render the flame and used the hierarchical programming structure to provide a simple and practical interactive flame simulation. We also designed and implemented demonstration system of flame simulation. Experiments show that using the flame image generated in this paper can not only satisfy the visual effect but also meet the real-time requirements.
An Image Edge Detection Algorithm Based on Improved Wavelet Transform
Xumin Liu,Zilong Duan,Xiaojun Wang,Weixiang Xu 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.4
In this paper, for wavelet modulus maxima edge detection affected by noise largely, we propose an improved image fusion algorithm. Firstly, wavelet denoising and smoothing filter are conducted on the original image. Secondly, making edge detection with wavelet transform modulus maxima edge detection and improved canny edge detection get each of edge detection images. Thirdly, let the wavelet fusion follow some certain fusion rules. Finally, making the inverse wavelet transform reconstruct the fused image. The experimental results show that the fused image combines the advantages of edge detection methods, which is an effective image edge detection method.
A Research about Adaptive Subdivision Algorithm Based On Doo-Sabin Mode
Xumin Liu,Yongxiu Xu,Xianpeng Yang,Xiaojun Wang 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.2
Subdivision surface method is a series of iterative operation adopts a certain subdivision formula for an initial grid, obtains the smooth limits surface finally, and can dispose any arbitrary complex topology grid. At present most of the subdivision algorithm are 1-4 subdivisions and as the number of subdivision increase, the grid grow so too-rapid in the number of patch that it is difficult for the model after subdivision to deal with other things. We proposed an adaptive Doo-Sabin Mode subdivision algorithm to solve this problem, which take the average vector of the vertex and the angle between the intersecting surfaces of the vertex as a measurement criterion. This criterion is used to divide the surface, and then make local subdivision. In this way, when the times of subdivision are fewer (the demand of smoothness is not too high), the effect of subdivision has little difference, but efficiency of the algorithm can be greatly improved. Compared with the normal Doo-Sabin subdivision model, experimental results showed that adaptive Doo-Sabin subdivision algorithm can largely slow the growth speed of the amount of model data on the premise that guarantee the quality of surface.
Gene expression analysis of “green tide” alga Ulva prolifera (Chlorophyta) in China
Shangang Jia,Xumin Wang,Guiming Liu,Dan Luo,Jing Zhang,Yan Liu,Xiangzhi Lin,Tao Liu 한국유전학회 2011 Genes & Genomics Vol.33 No.2
Ulva prolifera (Ulvophyceae, Chlorophyta) is the causative species of the annual “green tides” in the Bohai Gulf of Northern China. In order to gain some more insight into the transcriptome of this fast-growing species of algae, we acquired 6,203 high-quality expressed-sequence-tags (ESTs),which were clustered into 4,080 unique sequences (UniSeqs). Functional classification revealed that most of the acquired transcripts were related to metabolic and biosynthetic processes,nucleotide binding, and cell part that might contribute to the organism’s rapid growth. Using 39 EST pools, 28 mitochondria genomes, and 18 chloroplast genomes from algae and land plants, we constructed three phylogenetic trees. These trees provided evidence that U. prolifera was in a sister position to Ulva linza, and shared a similar chloroplast origin with Pseudendoclonium akinetum. The findings of this study will improve our knowledge of the transcriptome and taxonomic position of U. prolifera.
Comparative study on two finite element models for multi-clamp pipeline system
Yiming Cao,Qingdong Chai,Xumin Guo,Hui Ma,Pengfei Wang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.3
Due to the limitations of space and environment, a considerable number pipelines supported by multiple clamps are used in the external pipeline system of aero engines, which lead to the modeling difficulties and low efficiency. In this paper, taking U-shaped and Zshaped pipelines as examples, two methods of whole modeling and section modeling are used based on the finite element, and the piecewise linear models of clamps are introduced to compare the vibration characteristics under different boundary conditions. In addition, the simulation results are compared and verified by experiments. In the modal analysis, the coupled modes refer to the dependent modes which can influence each other through energy transfer while independent modes without energy transfer are called un-coupled modes. The results show that, for uncoupled modes of U-shaped and Z-shaped pipeline systems, the section model has smaller error and higher efficiency, which is suitable for the primary design stage of complex multi-clamp pipeline system. For the order of coupled mode, the accuracy of the whole model is high, and it is suitable for the check and vibration analysis of pipeline system. Moreover, the errors of both models decrease with the increase of tightening torque.
A new method to calculate the equivalent stiffness of the suspension system of a vehicle
Zhao, Pinbin,Yao, Guo-Feng,Wang, Min,Wang, Xumin,Li, Jianhui Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.3
The stiffness of a suspension system is provided by the bushings and the stiffness of the wheel center controls the suspension's elasto-kinematic (e-k) specification. So the stiffness of the wheel center is very important, but the stiffness of the wheel center is very hard to measure. The paper give a new method that we can use the stiffness of the bushings to calculate the equivalent stiffness of the wheel center, which can quickly and widely be used in all kinds of suspension structure. This method can also be used to optimize and design the suspension system. In the example we use the method to calculate the equivalent stiffness of the wheel center which meets the symmetric and positive conditions of the stiffness matrix.
A new method to calculate the equivalent stiffness of the suspension system of a vehicle
Pinbin Zhao,Guo-feng Yao,Min Wang,Xumin Wang,Jianhui Li 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.3
The stiffness of a suspension system is provided by the bushings and the stiffness of the wheel center controls the suspension's elasto-kinematic (e-k) specification. So the stiffness of the wheel center is very important, but the stiffness of the wheel center is very hard to measure. The paper give a new method that we can use the stiffness of the bushings to calculate the equivalent stiffness of the wheel center, which can quickly and widely be used in all kinds of suspension structure. This method can also be used to optimize and design the suspension system. In the example we use the method to calculate the equivalent stiffness of the wheel center which meets the symmetric and positive conditions of the stiffness matrix.