OALib Journal期刊

ISSN: 2333-9721




2018 ( 38 )

2017 ( 53 )

2016 ( 62 )

2015 ( 834 )


匹配条件: “Hai Guo” ,找到相关结果约42094条。
Research on Feature Extraction for Character Recognition of NaXi Pictograph
Hai Guo,Jingying Zhao
Journal of Computers , 2011, DOI: 10.4304/jcp.6.5.947-954
Abstract: Character recognition is one of important applications for pattern recognition. Feature extraction is the most important problem in character recognition. In this paper, we have researched on feature extraction for character recognition of NaXi pictograph. The characteristics of NaXi pictograph are firstly analyzed. Four kinds of features, including permeability number, coarse grid, directional line element, and invariant moments, and 6 kinds of computation distances, including Lidean distance, Standardized Euclidean distance, Minkowski metric, Chebychey distance, City distance, and Correlation distance will be applied to classify characters of NaXi pictograph, based on its characteristics. We have built a sample database containing 21000 samples for 2120 NaXi characters. The results of experiments suggest that coarse grid and directional element are more suitable for character recognition of NaXi pictograph, while invariant moments is not advisable for this task.
Optimal Power Allocation Scheme for Downlink CoMP Systems  [PDF]
Jun Li, Han Hai, Ying Guo, Moon Ho Lee
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.52B003
Abstract: Coordinated multi-point transmission and reception (CoMP) scheme enable LTE-Advanced systems to achieve their higher spectral efficiency. Allowing base stations to cooperate one another is one of the solutions to mitigate the inter-cell interference (ICI). In this paper, we propose an iterative power allocation scheme with MMSE procoding based on a modified water-filling for downlink CoMP systems, which achieves the optimal performance. The simulation results show that our proposed system can achieve its optimal rate according to its antenna configuration. Comparing them with a block diagonalization (BD) shows the advantages of MMSE precoding, in particular at a low SNR region.
Electromagnetically Induced Transparency Using a Artificial Molecule in Circuit Quantum Electrodynamics  [PDF]
Hai-Chao Li, Guo-Qin Ge
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.32B007

Electromagnetically induced transparency (EIT) having wide applications in quantum optics and nonlinear optics is explored ordinarily in various atomic systems. In this paper we present a theoretical study of EIT using supercon- ducting circuit with a V-type artificial molecule constructed by two Josephson charge qubits coupled each other through a large capacitor. In our theoretical model we make a steady state approximation and obtain the analytical expressions of the complex susceptibility for the artificial system via the density matrix formalism. The complex susceptibility has additional dependence on the qubit parameters and hence can be tuned to a certain extent.

Real scalar field scattering in the nearly extremal Schwarzschildben de Sitter space

Guo Guang-Hai,

中国物理 B , 2010,
Abstract: Reasonable approximations are introduced to investigate the real scalar field scattering in the nearly extremal Schwarzschild--de Sitter (SdS) space. The approximations naturally lead to the invertible x(r) and the global replacement of the true potential by a P?shl--Teller one. Meanwhile, the Schr?dinger-like wave equation is transformed into a solvable form. Our numerical solutions to the wave equation show that the wave is characteristically similar to the harmonic under the tortoise coordinate x, while the wave piles up near the two horizons and the wavelength tends to its maximum as the potential approaches to the peak under the radial coordinate r.
Area Spectra of Schwarzschild-Anti de Sitter Black Holes from Highly Real Quasinormal Modes

GUO Guang-Hai,DING Xia,

中国物理快报 , 2011,
Model the Electromagnetic Scattering from Three-Dimensional PEC Object Buried Under Rough Ground by MoM and Modified PO Hybrid Method
Hai Tao Chen;Guo-Qiang Zhu
PIER , 2007, DOI: 10.2528/PIER07072202
Abstract: In this paper, method of moment and modified physical optical hybrid method is used to analyze the scattering from 3-D PEC object buried under rough surface. The random rough ground surface is characterized with Gaussian statistics for surface height and for surface correlation function. The air-earth interface and the object are all replaced by the corresponding equivalent currents and the equivalent current on the ground surface is divided into two parts: the current caused by the incident wave which is named as incident current, and the current caused by buried object which is named as scattered current. The incident currents are obtained by PO approximation and the scattered currents are related to the current on the buried scatter by a modified PO method in this work. Only the current of scatter is considered as unknown and will be solved by MoM. After obtaining the current of scatter, the scattered current on the ground surface is calculated by the modified PO approximation. And the scatter field will be calculated by using the scattered current. In order to validate the hybrid method proposed in this paper, several numerical examples are given and compared with the results of MoM.
Feature Dimension Reduction of NaXi Pictographs Characters Recognition based on LDA
Hai Guo,Jinghua Yin,Jingying Zhao
International Journal of Computer Science Issues , 2012,
Abstract: As a kind of pictographic character, Naxi pictographs character has received little academic attention. Proposing dimension reduction method of Naxi pictographs characters on the basis of LDA (Linear Discriminant Analysis), this paper thus makes an in-depth study of feature dimension reduction, an important issue in the recognition of Naxi pictographs characters. By constructing a recognition sample library involving four features of grid feature, permeability number feature, moment invariant feature, and directional element feature (DEF), 50% of data are selected from sample library as training set and testing set respectively. Two dimension reduction methods of LDA and FA (Factor Analysis) are applied to dimension reduction experiment of features of Naxi pictographs characters. The experiment result proves LDA method to be significantly superior to FA method, as LDA method could still maintain a 99% recognition precision when the dimension is reduced to 10% of the original dimension.
NaXi Pictographs Input Method and WEFT
Hai Guo,Jing-ying Zhao
Journal of Computers , 2010, DOI: 10.4304/jcp.5.1.117-124
Abstract: NaXi Pictograph , which is the only hieroglyph in use is important for researching into the evolution of the character. In the past, processing NaXi Pictograph by hand, that is very inefficient. The NaXi Pictograph information processing modules is developed, such as pictograph Outline Font lib, the input method module, the embedded module and so on. A method of NaXi Pictographs Outline font extraction is proposed, which has been testified better in the Linux. As the specialty of NaXi Pictographs,two input mothods -- NaXi pictographs pinyin and graphic primitive input method are advanced, by evaluating ,which is found that the second is better than the first in precision. For display in web, The web embedding fonts technology of NaXi Pictographs is brought forward, and The web embedding fonts technology of NaXi pictographs makes Internet clients browse NaXi pictographs web without downloading NaXi pictographs font. The development of the NaXi Pictograph Information Processing System is significant to research into NaXi pictographs and apply it.
Chinese Minority Script Recognition Using Radial Basis Function Network
Hai Guo,Jing-ying Zhao
Journal of Computers , 2010, DOI: 10.4304/jcp.5.6.927-934
Abstract: The existing Chinese Minorities OCR system is mainly oriented in the "literacy" level, the script recognition has not attracted the attention it deserves, and the area of recognizing the kinds of Chinese minority scripts is still in a blank. The method of recognizing the kinds of Chinese minority scripts based on wavelet analysis and Radial Basis Function Network (RBFN) is presented which adopts wavelet decomposition that obtains feature descriptor of wavelet energy and wavelet energy distribution proportion. Combined with the texture feature of Chinese minority scripts, and construct multivariate classification in Radial Basis Function Network (RBFN). By building a data set which contains Tibetan, Tai Lue, Naxi Pictographs, Uighur, Tai Le, Yi 6 kinds common Chinese Minority Script, Chinese and English 8 kinds in total, we take a test to the Data Set of Chinese Minority by means of method in this paper, and the result shows that the method in the paper outperforms the traditional Bayes and KNN classification.
A Chinese Minority Script Recognition Method Based on Wavelet Feature and Modified KNN
Hai Guo,Jing-ying Zhao
Journal of Software , 2010, DOI: 10.4304/jsw.5.2.251-258
Abstract: In recent years, K-Nearest Neighbor (KNN) has demonstrated excellent performance in a variety of pattern recognition problems. In this paper, we proposed modified KNN for the Chinese minority scripts classification, using wavelet energy distribution and wavelet energy proportions features generated from the discrete wavelet multiresolution decomposition. The experimental results show that the method achieves high accuracy in testing dataset that consists of Chinese, English and Chinese minority scripts such as Tibetan, Tai Lue, Naxi Pictographs, Uighur, Tai Le, Yi. The results also show that this method is feasible and reasonable, and the recognition rate is up to 96%.

Copyright © 2008-2017 Open Access Library. All rights reserved.