检索结果-南通市图书馆

Evidential method to identify influential nodes in complex networks

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第2期26卷 381-387页

作者： Hongming Mo Cai Gao yong deng School of Computer and Information Science Southwest University Department of the Tibetan Language Sichuan University of Nationalities School of Automation Northwestern Polytechnical University School of Engineering Vanderbilt University

Identifying influential nodes in complex networks is still an open issue. In this paper, a new comprehensive centrality mea- sure is proposed based on the Dempster-Shafer evidence theory. The existing measures of degree centrality, betweenness centra- lity and closeness centrality are taken into consideration in the proposed method. Numerical examples are used to illustrate the effectiveness of the proposed method.

关键词： Dempster-Shafer evidence theory (D-S theory) belief function complex networks influential nodes evidential centrality comprehensive measure

High-resolution imaging through dynamic scattering media: Iterative optimization based on polarimetric characteristics

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2025年第1期 82-84页

作者： Meng XIANG Kai deng Tianyu WANG Jinpeng LIU Xue DONG Teli XI Fei LIU Xiaopeng SHAO School of Optoelectronic Engineering Xidian University Xi'an Key Laboratory of Computational Imaging National Key Laboratory of Infrared Detection Technologies

High-resolution imaging through randomly dynamic scattered fields and highly scattered walls is an extensively sought-after capability with potential applications in various fields such as underwater imaging, biomedical imaging, and seeing through fog. Numerous methods have been proposed to unscramble object information from degraded scattered images, resulting in considerable improvements in image contrast in degraded scenarios [1].

关键词：

Finite-time coordination control for formation flying spacecraft

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2014年第5期25卷 859-867页

作者： yong Guo Shenmin Song Liwei deng Center for Control Theory and Guidance Technology Harbin Institute of Technology

This paper investigates a distributed coordination control scheme using an adaptive terminal sliding mode for formation flying spacecraft with coupled attitude and translational dynamics. In order to overcome the singularity of the traditional fast terminal sliding manifold, a novel fast terminal sliding manifold is given. And then, based on the adaptive control method, a continuous robust coordinated controller is designed to compensate external disturbances and to alleviate the chattering phenomenon. The theoretical analysis shows that the coordinated controller can guarantee the finite-time stability of the overall closed-loop system through local information exchange, and numerical simulations also demonstrate its effectiveness.

关键词： formation flying coordinated control attitude and translational coupling finite-time stability adaptive control.

One-Dimensional Scanning of Electronic Wavefunction in Carbon Nanotubes by Molecular Encapsulation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2015年第6期28卷 -页

作者： Gui Ye Jun Li Ming-sen deng Jun Jiang Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials School of Chemistry and Materials Science University of Science and Technology of China Hefei 230026 China Guizhou Provincial Key Laboratory of Computational Nano-Material Science Guizhou Normal College Guiyang 550018 China

On the basis of first-principles calculations, we have designed a novel type of molecular systems in which a single-walled carbon nanotube(SWNT) is encapsulated by acyclic CB[n]-type molecular container. The electronic structures and coherent electron transportation properties of the molecules were simulated at the density functional theory level. Due to the weak interactions between the inner SWNT and outer molecular container, the acyclic part can slide along the nanotube direction, which in turn effectively changes the electron tunneling ability through the SWNT. The dependences of tunneling conductance on the position of the acyclic container attached to the SWNT were examined, which reflect clearly a Bloch form distribution of molecular wavefunction along the nanotube direction. We thus proposes a convenient way to scan the one-dimensional electron wavefunction in carbon nanotubes.

关键词： Single-walled carbon nanotube Molecular container One-dimensional electron wavefunction distribution Density functional theory

Interactive modeling of lofted shapes from a single image

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computational Visual Media 2020年第3期6卷 279-289页

作者： Congyue deng Jiahui Huang yong-Liang Yang Tsinghua University Beijing100084China University of Bath BathBA27AYUK

Modeling the complete geometry of general shapes from a single image is an ill-posed *** hints are often incorporated to resolve ambiguities and provide guidance during the modeling process. In this work, we present a novel interactive approach for extracting high-quality freeform shapes from a single image. This is inspired by the popular lofting technique in many CAD systems, and only requires minimal user input. Given an input image, the user only needs to sketch several projected cross sections, provide a"main axis", and specify some geometric relations. Our algorithm then automatically optimizes the common normal to the sections with respect to these constraints,and interpolates between the sections, resulting in a high-quality 3 D model that conforms to both the original image and the user input. The entire modeling session is efficient and intuitive. We demonstrate the effectiveness of our approach based on qualitative tests on a variety of images, and quantitative comparisons with the ground truth using synthetic images.

关键词： image User sketch

Impulse feature extraction method for machinery fault detection using fusion sparse coding and online dictionary learning

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2015年第2期28卷 488-498页

作者： deng sen Jing Bo Sheng Sheng Huang Yifeng Zhou Hongliang Aeronautics and Astronautics Engineering College Air Force Engineering University Unit 94371 of People's Liberation Army

Impulse components in vibration signals are important fault features of complex machines. Sparse coding （SC） algorithm has been introduced as an impulse feature extraction method, but it could not guarantee a satisfactory performance in processing vibration signals with heavy background noises. In this paper, a method based on fusion sparse coding （FSC） and online dictionary learning is proposed to extract impulses efficiently. Firstly, fusion scheme of different sparse coding algorithms is presented to ensure higher reconstruction accuracy. Then, an improved online dictionary learning method using FSC scheme is established to obtain redundant dictionary and it can capture specific features of training samples and reconstruct the sparse approximation of vibration signals. Simulation shows that this method has a good performance in solving sparse coefficients and training redundant dictionary compared with other methods. Lastly, the proposed method is further applied to processing aircraft engine rotor vibration signals. Compared with other feature extraction approaches, our method can extract impulse features accurately and efficiently from heavy noisy vibration signal, which has significant supports for machinery fault detection and diagnosis.

关键词： Dictionary learning Fault detection Impulse feature extraction Information fusion Sparse coding

Some tests and improvements to the VFISV: Very Fast Inversion of the Stokes Vector for the Helioseismic and Magnetic Imager

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2014年第11期14卷 1469-1480页

作者： Fei Teng Yuan-yong deng Key Laboratory of Solar Activity National Astronomical ObservatoriesChinese Academy of Sciences

Some experimental tests and improvements to the Very Fast Inversion of the Stokes Vector program, which is designed for the inversion calculation used by the Helioseismic and Magnetic Imager instrument on the Solar Dynamics Observatory, are given. On one hand, the interpolation for calculating the Voigt function is not smooth, which may occasionally cause the iteration process to converge to different minima although they are very close to initial values. This problem can be solved by a smoother interpolation. On the other hand, in order to improve the performance of this program, we have tried to abandon the randomly-jump-out strategy and set the initial value properly to avoid non-global minima. The resulting method costs only 1//4 of the computational time, and will be very competitive when the users are only interested in the vectorial magnetic fields and the velocities along the line of sight.

关键词： Sun magnetic fields -- methods numerical -- techniques polarimetric

A fast Stokes inversion technique based on quadratic regression

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第5期16卷 7-16页

作者： Fei Teng Yuan-yong deng Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences

Stokes inversion calculation is a key process in resolving polarization information on radiation from the Sun and obtaining the associated vector magnetic fields. Even in the cases of simple local thermo- dynamic equilibrium （LTE） and where the Milne-Eddington approximation is valid, the inversion problem may not be easy to solve. The initial values for the iterations are important in handling the case with mul- tiple minima. In this paper, we develop a fast inversion technique without iterations. The time taken for computation is only 1/100 the time that the iterative algorithm takes. In addition, it can provide available initial values even in cases with lower spectral resolutions. This strategy is useful for a filter-type Stokes spectrograph, such as SDO/HMI and the developed two-dimensional real-time spectrograph （2DS）.

关键词： Sun: magnetic fields -- methods: statistical -- methods: data analysis -- techniques: polari-metric

Quantitative estimation of enzymatic released specific oligosaccharides from Hericium erinaceus polysaccharides using CE-LIF

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2023年第2期13卷 201-208页

作者： yong deng Jing Zhao Shaoping Li State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao SAR999078China Joint Laboratory of Chinese Herbal Glycoengineering and Testing Technology University of MacaoMacao SAR999078China Macao Centre for Testing of Chineese Medicine University of MacaoMacao SAR999078China

Polysaccharides exhibit multiple pharmacological activities which are closely related to their structural ***,quantitatively quality control of polysaccharides based on their chemical charac-teristics is important for their application in biomedical and functional food ***,poly-saccharides are mixed macromolecular compounds that are difficult to isolate and lack standards,making them challenging to quantify *** this study,we proposed an improved saccharide mapping method based on the release of specific oligosaccharides for the assessment of Hericium eri-naceus polysaccharides from laboratory cultured and different regions of ***,a polysaccharide from *** was digested by b-(1-3)-glucanase,and the released specific oligosaccharides were labeled with 8-aminopyrene-1,3,6-trisulfonic-acid(APTS)and separated by using micellar electrokinetic chromatography(MEKC)coupled with laser induced fluorescence(LIF),and quantitatively *** presented higher resolution compared to polysaccharide analysis using carbohydrate gel elec-trophoresis(PACE),and provided great peak capacity between oligosaccharides with polymerization degree of 2(DP2)and polymerization degree of 6(DP6)in a dextran ladder *** results of high performance size exclusion chromatography coupled with multi-angle laser light scattering and refractive index detector(HPSEC-MALLS-RI)showed that 12 h was sufficient for complete digestion of polysaccharides from ***(DP3)was used as an internal standard for quantifi-cation of all the *** calibration curve for DP3 showed a good linear regression(R2>0.9988).The limit of detection(LOD)and limit of quantification(LOQ)values were 0.05 mg/mL and 0.2 mg/mL,*** recovery for DP3 was 87.32(±0.03)%in the three independent *** sum up,this proposed method is helpful for improving the quality control of polysaccharides from *** as well as othe

关键词： Saccharide mapping Hericium erinaceus Polysaccharide CE-LIF PACE