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- 저자 : Dongxu Qi (검색결과 6 건)
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A New Scheme for Watermarking Engineering Graph
Zhanchuan, Cai,Wei, Sun,Changzhen, Xiong,Dongxu, Qi Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1
Engineering graph plays an important role in design and manufacture, such as architecture, machinery, manufacture, military. However, almost no persons consider the security and copyright of two-dimensional engineering graph. A novel method for two-dimensional engineering graph watermark based U system is proposed in this paper. Watermarks generated by this technique can be successfully extracted even after rotation, translation and scaling transform.
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Multiwavelets over a Triangular Domain
Jian Li,Ruixia Song,Xiaochun Wang,Dongxu Qi (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Employing barycentric coordinates, this paper propose a kind of orthogonal muliwavelet over a triangular domain, called V-system. The V-system consists of not only smooth functions but also functions with discontinuities. Finitely terms of the V-system can exactly represent the geometric objects which can be expressed by a piecewise polynomials. Since barycentric coordinates are a fundamental tool for dealing with the case of triangles, and the expressions of the basic functions of the V-system in baycentric coordinates have short support, orthogonality, symmetry and vanishing moments, so the system is more concise and convenient to be used to realize orthogonal decomposition for the complex geometry models in CAGD. Especially, the geometry model composed of several separate parts can be exactly reconstructed, which can’t be realized by other continuous wavelets. The orthogonal decomposition provides theoretic fundament for feature extraction and further classification and shape retrieval. Experiment results show that this method is feasible and easy to use, and it worth being extended.
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Application of a Hybrid Orthogonal Function System on Trademark Image Retrieval
Xiaochun Wang,Yena Wang,Honglei Sun,Dongxu Qi (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Owing to an increase in the number of trademark images, evaluating a new trademark’s distinctiveness has become a challenge. This paper proposes a new class of orthogonal moment functions based on the W-system of degree one and applies the proposed W-moments on trademark retrieval. W-system of degree one is a hybrid function system on interval [0,1] consisting of piecewise linear functions with multi-level jump discontinuities, and has great advantage in representing information with discontinuities and describing disjointed or articulated contour shape. The W-moment is easy to compute due to the concise expression of the basis functions of the Wsystem of degree one. Furthermore, the new moments eliminate the need for numerical approximations, since the basis set is orthogonal on the discrete domain of the image coordinate space. These properties make W-moments preferable to the conventional orthogonal moments, and can be used to accurately reconstruct the objects, especially, objects group. So the W-moments are suitable for describing complex shape consisting of multiple disjointed curves, such as trademark images. In this paper, the W-moment is applied on trademark retrieval. The W-moments are first derived from the trademark image, the similarity between query and trademark in the database is then evaluated using the Euclidean distance between their W-moment feature vectors, and the trademark retrieval is finally accomplished by comparing the similarities. The experiments are conducted on MPEG-7 CE2 and a self-constructed trademark data set to test the proposed moments. Comparison experiment results show that the new moments give preferable retrieval results and it is feasible and efficient in practical application.
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Qin, Na,Yang, Wei,Feng, Dongxu,Wang, Xinwen,Qi, Muyao,Du, Tianxin,Sun, Hongzhi,Wu, Shufang The Korean Society of Ginseng 2016 Journal of Ginseng Research Vol.40 No.3
Background: Ginsenosides have been shown to exert beneficial pharmacological effects on the central nervous, cardiovascular, and endocrine systems. We sought to determine whether total ginsenosides (TG) inhibit monocrotaline (MCT)-induced pulmonary hypertension and to elucidate the underlying mechanism. Methods: MCT-intoxicated rats were treated with gradient doses of TG, with or without $N^G$-nitro-$\small{L}$-arginine methyl ester. The levels of molecules involving the regulation of nitric oxide and mitogen-activated protein kinase pathways were determined. Results: TG ameliorated MCT-induced pulmonary hypertension in a dose-dependent manner, as assessed by the right ventricular systolic pressure, the right ventricular hypertrophy index, and pulmonary arterial remodeling. Furthermore, TG increased the levels of pulmonary nitric oxide, endothelial nitric oxide synthase, and cyclic guanosine monophosphate. Lastly, TG increased mitogen-activated protein kinase phosphatase-1 expression and promoted the dephosphorylation of extracellular signal-regulated protein kinases 1/2, p38 mitogen-activated protein kinase, and c-Jun NH2-terminal kinase 1/2. Conclusion: TG attenuates MCT-induced pulmonary hypertension, which may involve in part the regulation of nitric oxide and mitogen-activated protein kinase pathways.
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Spectral Analysis of the Moving System with Multi-object Based on V-system
Ruixia Song,Chenghua Li,Xiaochun Wang,Yena Wang,Yanqing Xu,Dongxu Qi (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Based on an orthogonal function system over triangular domain, V-system, decomposing orthogonally a moving system with multiple moving objects into V-series, motion state of this moving system at different moment can be expressed in the frequency domain. To make full use of the advantage of the V-system, the capability to precisely express a 3D object group, each moving object is represented by a triangular mesh model, and then the energy curve data for the moving system is calculated by determining the coefficients of the V-series. The energy curve can be applied to the state analysis of the moving system. The relationship of energy curves of a moving system with different triangular mesh resolutions is analyzed. The experiment results show that there exist no strong dependence between energy curve and the resolution of 3D model, so when performing spectral analysis for a moving system, we can choose the model with low resolution, so that the computation can be reduced and the analysis efficiency can be improved. Finally, the mathematic relationship between energy of a moving system and some related variables is obtained by processing a large number of experimental data using the linear regression method. The characteristic of this study is reflected in the whole expression of a 3D model group, and the objects in the group are in motion.
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