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有理正切加网算法的改进研究
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作者 李杰 王海文 《影像技术》 CAS 2011年第3期28-30,共3页
采用标准灰度图,基于阈值模版法利用Matlab编程方法,验证了Photoshop采用有理正切加网算法。针对数字加网技术中有理正切加网的核心问题(传统加网角度15°的逼近问题)以及其它理论与技术问题,利用Matlab编程方法通过不同阶数的加网... 采用标准灰度图,基于阈值模版法利用Matlab编程方法,验证了Photoshop采用有理正切加网算法。针对数字加网技术中有理正切加网的核心问题(传统加网角度15°的逼近问题)以及其它理论与技术问题,利用Matlab编程方法通过不同阶数的加网实验进行改进研究。主要结论是:18.4°并不是传统加网角度15°的最佳代替角度,三个主要加网角度(0°、18.4°、45°)的最佳加网线数比并不是唯一的,而是有更多的自由选择。 展开更多
关键词 有理正切加 算法 数字加 PHOTOSHOP
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默比斯网的结构及性质
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作者 金仲伯 《中国校外教育》 2009年第S4期258-258,共1页
介绍了默比斯网的结构,并通过两平面间射影对应的办法探讨默比斯网的性质和两个默比斯网之间的关系。
关键词 默比斯 射影对应 仿射坐标系 有理 有理网 生成
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Molecular Biological Mechanisms of Yuan Zhi Powder in the Treatment of Alzheimer's Disease: an Analysis Based on Network Pharmacology 被引量:9
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作者 Wei-Jie QIANG Ying CHEN +9 位作者 Fu-Yuan HE Mei-Feng XIAO Wei-Yan CAI Yi-Fei DAI Qing YANG Yu-Jie LI Xiao-Gang WENG Qi LI Ya-Jie WANG Xiao-Xin ZHU 《Digital Chinese Medicine》 2018年第1期90-101,共12页
Objective To predict the main active ingredients,potential targets and molecular mechanisms of Yuan Zhi powder in treatment of dementia by using network pharmacology.Methods A database of chemical constituents of Yuan... Objective To predict the main active ingredients,potential targets and molecular mechanisms of Yuan Zhi powder in treatment of dementia by using network pharmacology.Methods A database of chemical constituents of Yuan Zhi powder was constructed by using databases and literatures.Potential targets were predicted by reverse molecular docking,and then a component-target network was constructed.The target network of Alzheimer's disease(AD)was mapped and analyzed to obtain the“active ingredient-AD target”network.The key targets were screened through network analysis.Finally,the rationality of the prediction was analyzed by comparing with the target reported in the literatures.Results There were180chemical constituents acting on the AD target,and the targets included three key targets(cyclooxygenase-2,muscarinic acetylcholine receptor M1,and muscarinic acetylcholine receptor M2)and an important target(acetylcholine esterase).Alzheimer's disease may be treated by regulating the activity of acetylcholine receptors and the binding toβ-amyloid protein,and its biological process may be concentrated in the acetylcholine receptor signal pathway,negative regulation of synaptic transmission and so on.Conclusion The fact that Yuan Zhi powder can treat AD is consistent with the characteristics of multi-components-multitargets-multiple pathways of traditional Chinese medicine.The important targets obtained from network analysis have a large proportion in literature research,so network analysis have some rationality. 展开更多
关键词 Yuan Zhi powder Network pharmacology Active ingredients–AD targets network Network analysis DEMENTIA
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Correspondence Between Bell Bases and Oriented Links in Knot Theory
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作者 QIANShang-Wu GUZhi-Yu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第6期659-662,共4页
From the comparison of correlation tensor in the theory of quantum network, the Alexander relation matrix in the theory of knot crystals and the identical inversion relations under the action of Pauli matrices, we sho... From the comparison of correlation tensor in the theory of quantum network, the Alexander relation matrix in the theory of knot crystals and the identical inversion relations under the action of Pauli matrices, we show that there is a one to one correspondence between four Bell bases and four oriented links of the linkage in knot theory. 展开更多
关键词 Bell bases correlation tensor in the theory of quantum network Alexander relation matrix in the theory of knot crystals linkage 4(1) inversion relations under the action of Pauli matrices
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Agent-Based Simulation for Analyzing Network Formation with Learning Dynamics
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作者 Michiharu Masui Mikio Ogawa 《Journal of Mathematics and System Science》 2012年第9期576-585,共10页
In game theoretic context, it is assumed that the decision maker has the extraordinary skills of reasoning and calculation. This assumption is called "perfect rationality". A player with perfect rationality can solv... In game theoretic context, it is assumed that the decision maker has the extraordinary skills of reasoning and calculation. This assumption is called "perfect rationality". A player with perfect rationality can solve complex problems without making mistakes. However, recently, many studies have restricted this rationality or the structure of game. These restrictions are called "bounded rationality." The authors also focus on bounded rationality, but with learning dynamics and complex networks. A complex network covers a wide area. Currently, a wide range of studies have not only investigated network formation and the characteristics of a formed network, but also analyzed situations where a network is already provided. In addition, in an analysis using game theory, a prisoners' dilemma type game was used to investigate how a change in the network structure would affect the players' relationships Therefore, our model employs decision makers with learning dynamics and describes the interaction of decision makers as a network. The purpose of this study is to examine the behavior of the decision maker with learning dynamics and the formation of networks by the interaction of decision makers through an agent-based simulation. 展开更多
关键词 Game theory complex network simple dynamics best-response dynamics agent-based simulation.
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Neural Network Based on Quantum Chemistry for Predicting Melting Point of Organic Compounds 被引量:1
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作者 Juan A. Lazzus 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2009年第1期19-26,共8页
The melting points of organic compounds were estimated using a combined method that includes a backpropagation neural network and quantitative structure property relationship (QSPR) parameters in quantum chemistry. ... The melting points of organic compounds were estimated using a combined method that includes a backpropagation neural network and quantitative structure property relationship (QSPR) parameters in quantum chemistry. Eleven descriptors that reflect the intermolecular forces and molecular symmetry were used as input variables. QSPR parameters were calculated using molecular modeling and PM3 semi-empirical molecular orbital theories. A total of 260 compounds were used to train the network, which was developed using MatLab. Then, the melting points of 73 other compounds were predicted and results were compared to experimental data from the literature. The study shows that the chosen artificial neural network and the quantitative structure property relationships method present an excellent alternative for the estimation of the melting point of an organic compound, with average absolute deviation of 5%. 展开更多
关键词 Melting point Quantitative structure-property relationship Artificial neural network Quantum chemistry
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Combined back-analysis method of ground stress based on refined geological modeling
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作者 Liu Donghai Zheng Jiang Wang Qian 《Engineering Sciences》 EI 2012年第4期43-50,共8页
A new back-analysis method of ground stress is proposed with comprehensive consideration of influence of topography, geology and nonlinear physical mechanical properties of rock on ground stress. This method based on ... A new back-analysis method of ground stress is proposed with comprehensive consideration of influence of topography, geology and nonlinear physical mechanical properties of rock on ground stress. This method based on non-uniform rational B-spline (NURBS) technology provides the means to build a refined three-dimensional finite element model with more accurate meshing under complex terrain and geological conditions. Meanwhile, this method is a back-analysis of ground stress with combination of multivariable linear regression model and neural network (ANN) model. Firstly, the regression model is used to fit approximately boundary loads. Regarding the regressed loads as mean value, some sets of boundary loads with the same interval are constructed according to the principle of orthogonal design, to calculate the corresponding ground stress at the observation positions using finite element method. The results (boundary loads and the corresponding ground stress) are added to the samples for ANN training. And on this basis, an ANN model is established to implement higher precise back-analysis of initial ground stress. A practical application case shows that the relative error between the inversed ground stress and observed value is mostly less than 10 %, which can meet the need of engineering design and construction requirements. 展开更多
关键词 ground stress BACK-ANALYSIS combined method refined geological modeling artificial neural network(ANN) NURBS
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基于无线传感器网络定位技术的图书馆智能管理创新 被引量:3
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作者 罗桦 陈勇 +2 位作者 张清 赵滟 黄猛 《大学图书情报学刊》 2016年第2期50-52,57,共4页
"互联网+"时代,信息技术的发展对图书馆的智能化管理工作提出了更高的要求。文章概述了无线传感器网络与定位技术,重点讨论了如何将WSN定位技术运用到图书智能管理,通过定位技术与大数据、云计算等信息技术的结合,推动图书馆... "互联网+"时代,信息技术的发展对图书馆的智能化管理工作提出了更高的要求。文章概述了无线传感器网络与定位技术,重点讨论了如何将WSN定位技术运用到图书智能管理,通过定位技术与大数据、云计算等信息技术的结合,推动图书馆智能系统建设和智能化发展。 展开更多
关键词 图书馆 智能管理 无线传感器 定位技术 互联+
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A new interpretation of internal-variable theory in finite thermo-viscoelasticity 被引量:3
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作者 HUANG ZhuPing DUI GuanSuo YANG ShengYou 《Science China Chemistry》 SCIE EI CAS 2013年第3期610-616,共7页
Based on the non-equilibrium thermodynamics,an internal-variable theory in thermo-viscoelasticity at finite deformation was proposed by Huang in 1999.In this theory,a modified stretch of the molecular chain was introd... Based on the non-equilibrium thermodynamics,an internal-variable theory in thermo-viscoelasticity at finite deformation was proposed by Huang in 1999.In this theory,a modified stretch of the molecular chain was introduced,and hence the molecular network model in rubber elasticity was extended to take into account the viscous and thermal effects of the material.The viscous dissipation of the material can then be described by means of these internal variables,which appear in the expression of the modified stretch.In order to give a clearer explanation on the physical implication of the internal variables,a connection between the internal-variable theory and theoretical formulation based on the multiplicative decomposition of the deformation gradient in existing literature is presented in this paper,which allows the above internal-variable theory to be more systematic. 展开更多
关键词 thermo-viscoelasticity internal variables finite deformation multiplicative decomposition of the deformation gradient
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The Extension of Infinitesimal Prolongation Theorem and Its Application
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作者 陈东立 《Journal of Mathematical Research and Exposition》 CSCD 北大核心 2003年第2期221-224,共4页
Infinitesimal prolongation theorem is extended from sequences to nets based on κ-saturated nonstandard model. As its an application, a main property about topology of uniform convergence is proved. The proof is much ... Infinitesimal prolongation theorem is extended from sequences to nets based on κ-saturated nonstandard model. As its an application, a main property about topology of uniform convergence is proved. The proof is much simpler than it was, meanwhile the nonstandard characteristics of convergence with respect to u.c. topology is given. 展开更多
关键词 Infinitesimal Prolongation Theorem κ-saturation monad of uniformity topology of uniform convergence.
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A LINEAR PROGRAMMING MODEL BASED ON NETWORK FLOW FOR PATHWAY INFERENCE
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作者 Xianwen REN Xiang-Sun ZHANG 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2010年第5期971-977,共7页
Signal transduction pathways play important roles in various biological processes such as cell cycle, apoptosis, proliferation, differentiation and responses to the external stimuli. Efficient computational methods ar... Signal transduction pathways play important roles in various biological processes such as cell cycle, apoptosis, proliferation, differentiation and responses to the external stimuli. Efficient computational methods are of great demands to map signaling pathways systematically based on the interactome and microarray data in the post-genome era. This paper proposes a novel approach to infer the pathways based on the network flow well studied in the operation research. The authors define a potentiality variable for each protein to denote the extent to which it contributes to the objective pathway. And the capacity on each edge is not a constant but a function of the potentiality variables of the corresponding two proteins. The total potentiality of all proteins is given an upper bound. The approach is formulated to a linear programming model and solved by the simplex method. Experiments on the yeast sporulation data suggest this novel approach recreats successfully the backbone of the MAPK signaling pathway with a low upper bound of the total potentiality. By increasing the upper bound, the approach successfully predicts all the members of the Mitogen-activated protein kinases (MAPK) pathway responding to the pheromone. This simple but effective approach can also be used to infer the genetic information processing pathways underlying the expression quantitative trait loci (eQTL) associations, illustrated by the second example. 展开更多
关键词 Gene expression linear programming network flow pathway inference protein interaction network.
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Finite-Time Generalized Outer Synchronization Between Two Different Complex Networks 被引量:4
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作者 孙永征 李望 阮炯 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第11期697-703,共7页
This paper investigates the finite-time generalized outer synchronization between two complex dynamical networks with different dynamical behaviors. The two networks can be undirected or directed, and they may also co... This paper investigates the finite-time generalized outer synchronization between two complex dynamical networks with different dynamical behaviors. The two networks can be undirected or directed, and they may also contain isolated nodes and clusters. By using suitable controllers, sufficient conditions for finite-time generalized outer synchronization are derived based on the finite-time stability theory. Finally, numerical examples are examined to illustrate the effectiveness of the analytical results. The effect of control parameters on the synchronization time is also numerically demonstrated. 展开更多
关键词 complex dynamical network finite-time synchronization
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An XPath-based OWL storage model for effective ontology management in Semantic Web environment
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作者 Jinhyung KIM Dongwon JEONG Doo-kwon BAIK 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第6期843-857,共15页
With the rapid growth of the Web, the volume of information on the Web is increasing exponentially. However, information on the current Web is only understandable to humans, and this makes precise information retrieva... With the rapid growth of the Web, the volume of information on the Web is increasing exponentially. However, information on the current Web is only understandable to humans, and this makes precise information retrieval difficult. To solve this problem, the Semantic Web was proposed. We must use ontology languages that can assign data the semantics for realizing the Semantic Web. One of the representative ontology languages is the Web ontology language OWL, adopted as a recommen-dation by the World-Wide Web Consortium (W3C). OWL includes hierarchical structural information between classes or prop-erties. Therefore, an efficient OWL storage model that considers a hierarchical structure for effective information retrieval on the Semantic Web is required. In this paper we suggest an XPath-based OWL storage (XPOS) model, which includes hierarchical information between classes or properties in XPath form, and enables intuitive and effective information retrieval. Also, we show the comparative evaluation results for the performance of the XPOS model, Sesame, and the XML file system-based storage (XFSS) model, in terms of query processing and ontology updating. 展开更多
关键词 XPATH Web ontology language Hierarchical structure Ontology storage Semantic Web
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