期刊：
Results in Mathematics,2024年79(2) ISSN：1422-6383
通讯作者：
Chen, SL
作者机构：
[Chen, Shaolin; Chen, SL] Hengyang Normal Univ, Coll Math & Stat, Hengyang 421002, Hunan, Peoples R China.;[Chen, Shaolin; Chen, SL] Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.;[Hamada, Hidetaka] Kyushu Sangyo Univ, Fac Sci & Engn, 3-1 Matsukadai 2 Chome,Higashi Ku, Fukuoka 8138503, Japan.
通讯机构：
[Chen, SL ] H;Hengyang Normal Univ, Coll Math & Stat, Hengyang 421002, Hunan, Peoples R China.;Hunan Prov Key Lab Intelligent Informat Proc & App, Hengyang 421002, Peoples R China.
关键词：
Bloch type space;complex-valued harmonic function;composition operator;hardy space;pluriharmonic functions
摘要：
The main purpose of this paper is to investigate characterizations of composition operators on Bloch and Hardy type spaces. Initially, we use general doubling weights to study the composition operators from harmonic Bloch type spaces on the unit disc D\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb {D}}$$\end{document} to pluriharmonic Hardy spaces on the Euclidean unit ball Bn\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb {B}}<^>n$$\end{document}. Furthermore, we develop some new methods to study the composition operators from harmonic Bloch type spaces on D\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb {D}}$$\end{document} to pluriharmonic Bloch type spaces on D\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathbb {D}}$$\end{document}. Additionally, some application to new characterizations of the composition operators between pluriharmonic Lipschitz type spaces to be bounded or compact will be presented. The obtained results of this paper provide the improvements and extensions of the corresponding known results.
作者机构：
[Liu, Wenliang; Huang, Si; Yan, Xiaofeng; Chen, Lili; Liu, WL; Guo, Yuntian] Hunan Univ Technol, Key Lab Adv Packaging Mat & Technol Hunan Prov, Zhuzhou 412007, Peoples R China.;[Chen, Lili] Hengyang Normal Univ, Art Inst, Hengyang 421010, Peoples R China.;[Wu, Yincai] Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Xiamen 361021, Peoples R China.
通讯机构：
[Huang, S ; Liu, WL] H;Hunan Univ Technol, Key Lab Adv Packaging Mat & Technol Hunan Prov, Zhuzhou 412007, Peoples R China.
关键词：
navel orange peel pomace;soluble dietary fiber;nanocellulose;best formula
摘要：
The packaging problem with petroleum-based synthetic polymers prompts the development of edible packaging films. The high value-added reuse of navel orange peel pomace, which is rich in bioactive compounds, merited more considerations. Herein, nanocellulose (ONCC) and soluble dietary fiber (OSDF) from navel orange peel pomace are firstly used to prepare dietary fiber-based edible packaging films using a simple physical blend method, and the impact of ONCC on the film's properties is analyzed. Adopting three methods in a step-by-step approach to find the best formula for edible packaging films. The results show that dietary-fiber-based edible packaging films with 4 wt.% ONCC form a network structure, and their crystallinity, maximum pyrolysis temperature, and melting temperature are improved. What's more, dietary-fiber-based edible packaging films have a wide range of potential uses in edible packaging.
摘要：
Uncertainty analysis of evapotranspiration models is essential in hydrological modeling, particularly given the limited use of process-based models and ensemble algorithms for evapotranspiration estimation. In this study, the performance and uncertainty in two simplified process-based models (BTA and BTA-theta), and three classical ensemble algorithms (adaptive boosting, random forest, and extreme gradient boosting) in estimating evapotranspiration are assessed across various ecosystems. The results show that: (a) the BTA-theta model outperforms the BTA model across all ecosystems, and the integrated algorithms perform better than the two process-based models. (b) In the two process-based models, parameter k is insensitive to the outcomes, while parameters b, k1, and theta 1 are highly sensitive. (c) The primary source of uncertainty in the ensemble algorithms is parameterization, the structure of the BTA model, and the input data of the BTA-theta model. The findings provide valuable insights for increasing the evapotranspiration estimation accuracy and reliability. This study helps to improve the accuracy and reliability of evapotranspiration estimation in terrestrial ecosystems.
期刊：
Lecture Notes in Computer Science,2019年11640:121-128 ISSN：0302-9743
通讯作者：
Fu, Bin
作者机构：
[Fu, Bin; Chen, Zhixiang] Univ Texas Rio Grande Valley, Dept Comp Sci, Edinburg, TX 78539 USA.;[Feng, Qilong; Wang, Jianxin] Cent Southern Univ, Sch Informat, Changsha, Peoples R China.;[Lin, Mugang] Hengyang Normal Univ, Sch Comp Sci & Technol, Hengyang, Peoples R China.
通讯机构：
[Fu, Bin] U;Univ Texas Rio Grande Valley, Dept Comp Sci, Edinburg, TX 78539 USA.
会议名称：
13th International Conference on Algorithmic Aspects in Information and Management (AAIM)
会议时间：
AUG 06-08, 2019
会议地点：
Beijing, PEOPLES R CHINA
会议主办单位：
[Chen, Zhixiang;Fu, Bin] Univ Texas Rio Grande Valley, Dept Comp Sci, Edinburg, TX 78539 USA.^[Feng, Qilong;Wang, Jianxin] Cent Southern Univ, Sch Informat, Changsha, Peoples R China.^[Lin, Mugang] Hengyang Normal Univ, Sch Comp Sci & Technol, Hengyang, Peoples R China.
会议论文集名称：
Lecture Notes in Computer Science
摘要：
In this paper, we develop an exponential time approximation scheme for the traveling salesman problem (TSP) on undirected graphs. If the weight of each edge is a nonnegative real number, then there is an algorithm to give an \((1+\epsilon )\) approximation for the TSP problem in \(O({1\over \epsilon }\cdot 1.66^n)\) and a polynomial space. It is in contrast to Golovnen’s approximation scheme for TSP on directed graphs with \(\mathrm{O}({1\over \epsilon }\cdot 2^n)\) time. We also show that there is no \(2^{o(n)}\) time constant factor approximation for the TSP problem under Exponential Time Hypothesis in complexity theory.
期刊：
IOP Conference Series: Earth and Environmental Science,2019年237(2):022020- ISSN：1755-1307
通讯作者：
Liu, Jian;Yao, Jun
作者机构：
[Liu, Xing; Liu, Jian; Zeng, Rongying; Yi, Zhengji] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Liu, Xing; Liu, Jian; Zeng, Rongying; Yi, Zhengji] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Yao, Jun] China Univ Geosci Beijing, Sino Hungarian Joint Lab Environm Sci & Hlth, Sch Water Resource & Environm Engn, 29 Xueyuan Rd, Beijing 100083, Peoples R China.
通讯机构：
[Liu, Jian] H;[Yao, Jun] C;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;China Univ Geosci Beijing, Sino Hungarian Joint Lab Environm Sci & Hlth, Sch Water Resource & Environm Engn, 29 Xueyuan Rd, Beijing 100083, Peoples R China.
会议名称：
4th International Conference on Advances in Energy Resources and Environment Engineering (ICAESEE)
会议时间：
DEC 07-09, 2018
会议地点：
Chengdu, PEOPLES R CHINA
会议主办单位：
[Yi, Zhengji;Liu, Xing;Liu, Jian;Zeng, Rongying] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.^[Yi, Zhengji;Liu, Xing;Liu, Jian;Zeng, Rongying] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.^[Yao, Jun] China Univ Geosci Beijing, Sino Hungarian Joint Lab Environm Sci & Hlth, Sch Water Resource & Environm Engn, 29 Xueyuan Rd, Beijing 100083, Peoples R China.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
The aim of the present research is to study the applicability of using dead Hydrilla verticillata powder to remove lead(II) ion from aqueous solution by means of batch experiments. Influence of oscillation time, solution pH value, and initial Pb(II) level upon its biosorption was examined in some detail. The result indicated that Pb(II) adsorption is highly pH dependent. The pH range from 5.0 to 5.5 is most favorable for Pb(II) removal with ca. 90% of Pb(II) removed. The adsorption data was in agreement with pseudo-first-order kinetics with an adsorption equilibrium time of 50 min. Isotherm data can be described by the Langmuir equation with a maximum adsorption capacity of 157.23 mg/g. These findings suggest that H. verticillata could be a promising biosorbent for Pb(II) removal.
摘要：
Spin-controlled vortex generation is a manifestation of the spin-orbit interaction (SOI) of light, which has been extensively studied in Pancharatnam-Berry geometric phase elements in recent years. The SOI under the normal incidence of a light beam at a sharp interface, also shown by a spin-dependent vortex, has attracted little attention, except for a few exceptions. Here, we establish a Fresnel Jones matrix to fully describe the dynamics of beam reflection and refraction at sharp interfaces under normal incidence. It is pointed out that the vortex phase originates from the topological structure of the beam itself and is essentially a spin-redirection Berry phase. Although the geometric phase in Pancharatnam-Berry elements comes from the anisotropy of the external material, which shows a fundamental difference, they are the same in form. We then give a comparative study of the two kinds of SOI, and reveal the intrinsic connection and difference between them. Our research not only establishes a unified framework to describe the two SOIs, but also offers a new perspective for studying the SOIs in other physics.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
The purpose of this investigation was to explore the feasibility of utilizing heat inactivated (killed) Elodea canadensis to eliminate divalent lead ions from water solution via batch tests. The Pb(II) biosorption features of E. canadensis biomass were examined with regard to adsorption time, solution pH value and Pb(II) concentration. Our experimental result suggested that the lead biosorption depended highly on medium pH. A pH of 5.0 is most beneficial to lead removal. The biosorption data agreed with pseudo-second-order kinetic model with an adsorption equilibrium time of 60 minutes. Isotherm data agreed with Langmuir isotherm equation with 21.36 mg/g of maximum biosorption capacity. The results suggested that E. canadensis is an inexpensive and efficient sorbent for the elimination of Pb(II) from wastewater.
摘要：
In high-power laser systems for inertial confinement fusion, hot images may be intense enough to damage expensive optical components. Basing on split-step fast-Fourier-transform algorithm, the intensity and location of hot images of a spectrally dispersed sinusoidal phase modulated laser beam is numerically investigated. It is found that, the time-average intensity of hot image firstly decreases monotonically with the modulation depth and eventually reaches a certain minimum, then increases slowly and reaches a saturated value; in addition, with the modulation frequency and the grating dispersion coefficient increasing, the time-average intensity of hot image decreases generally; while the location of hot image always does not change. Finally, the influence of the distance from the obscuration to the nonlinear optical element on the suppression effect of spectral dispersion of sinusoidal phase modulated light on formation of hot images is discussed. The result is helpful to appropriately choose parameters of the spectrally dispersed sinusoidal phase modulated light to minimize the threat of optical damage of hot image and improve the performance of high- power laser system.
期刊：
Journal of Computational and Applied Mathematics,2018年329:57-67 ISSN：0377-0427
通讯作者：
Zhang, Jie
作者机构：
[Liu, Xiuping; Li, Yujiao; Cao, Junjie; Chen, He] Dalian Univ Technol, Sch Math Sci, Dalian, Peoples R China.;[Cao, Junjie] Nanchang Hangkong Univ, Coll Math & Informat Sci, Nanchang, Jiangxi, Peoples R China.;[Zhang, Jie] Liaoning Normal Univ, Sch Math, Dalian, Peoples R China.;[Zou, Changqing] Hengyang Normal Univ, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhang, Jie] L;Liaoning Normal Univ, Sch Math, Dalian, Peoples R China.
会议名称：
International Conference on Information and Computational Science (ICICS)
会议时间：
AUG 02-06, 2016
会议地点：
Dalian Univ Technol, Dalian, PAKISTAN
会议主办单位：
Dalian Univ Technol
关键词：
Normal estimation;Point cloud;Neighborhood shift
摘要：
For accurately estimating the normal of a point, the structure of its neighborhood has to be analyzed. All the previous methods use some neighborhood centering at the point, which is prone to be sampled from different surface patches when the point is near sharp features. Then more inaccurate normals or higher computation cost may be unavoidable. To conquer this problem, we present a fast and quality normal estimator based on neighborhood shift. Instead of using the neighborhood centered at the point, we wish to locate a neighborhood containing the point but clear of sharp features, which is usually not centering at the point. Two specific neighborhood shift techniques are designed in view of the complex structure of sharp features and the characteristic of raw point clouds. The experiments show that our method out-performs previous normal estimators in either quality or running time, even in the presence of noise and anisotropic sampling. (C) 2017 Elsevier B.V. All rights reserved.
摘要：
This study proposed a new hybrid approach for short-term water demand prediction. Raw water demand data were decomposed into a set of intrinsic mode functions (IMFs) component and a residue by using ensemble empirical mode decomposition (EEMD) method. IMF1 is the main random component of the raw water demand data, the continuous deep belief neural network (CDBNN) model is used to predict IMF1. Other IMFs and residue can be recombined employing autoregressive integrated moving average (ARIMA) model for forecasting, this method reduces forecasting steps without increasing the forecasting error. The final forecasting result was obtained by summing the forecasting results of the two models. A historical hourly water demand data from an urban waterworks of Zhuzhou, China were investigated by the hybrid method. Simulation results indicate that the proposed approach has higher forecasting accuracy than back propagation neural network (BPNN), support vector regression (SVR), EEMD and their combinations.
摘要：
Conjugate gradient methods can be used with advantages such as fast convergence and low memory requirement in real applications. A conjugate gradient-based neuro-fuzzy learning algorithm for zero-order Takagi-Sugeno inference systems is proposed in this paper. Compared with the existing gradient-based algorithm, this method enhances the learning performance.
摘要：
Parabolic phase is commonly utilized for concave or convex metalens. Here, we report for the first time using such approach for determinant diffusion of scattering waves in wide incident angles by arranging parabolic-phased subarrays in arbitrary coding sequences. To engineer multi-spectrum polarization-dependent bifunctional scatterings, multi-mode anisotropic meta-atoms are utilized without polarization cross-talking. For verification, two proof-to-concept coding metasurfaces are designed, fabricated and measured at microwave regime. Numerical and experimental results show that the -10 dB backscatter radar cross-section (RCS) reduction is clearly observed in C, X and Ku band. Moreover, the diffusion behavior can be engineered dual-polarized and even bifunctional by integrating vortex scattering. Our findings, free of time-consuming optimizations, opened a rapid, easy but very efficient way for stealth applications under bistatic detection.
摘要：
Recognition of handwritten digits is a very popular application of machine learning. In this context, each of the ten digits (0-9) is defined as a class in the setting of machine learning based classification tasks. In general, popular learning methods , such as support vector machine, neural networks and K nearest neighbours, have been used for classifying instances of handwritten digits to one of the ten classes. However, due to the diversity of handwriting styles from different people, it can happen that some handwritten digits (e.g. 4 and 9) are very similar and are thus difficult to distinguish. Also, each single learning algorithm may have its own advantages and disadvantages, which means that a single algorithm would be capable of learning some but not all specific characteristics of handwritten digits. From this point of view, a method for handwritten digits recognition is proposed in the setting of ensemble learning, towards encouraging the diversity among different classifiers trained by different learning algorithms. In particular, the image features of handwritten digits are extracted by using the Convolutional Neural Network architecture. Furthermore, single classifiers trained respectively by K nearest neighbours and random forests are fused as an ensemble one. The experimental results show that the ensemble classifier was able to achieve a recognition accuracy of ≥ 98% using the MNISET data set.
摘要：
Image segmentation is a popular application area of machine learning. In this context, each target region drawn from an image is defined as a class towards recognition of instances that belong to this region (class). In order to train classifiers that recognize the target region to which an instance belongs, it is important to extract and select features relevant to the region. In traditional machine learning, all features extracted from different regions are simply used together to form a single feature set for training classifiers, and feature selection is usually designed to evaluate the capability of each feature or feature subset in discriminating one class from other classes. However, it is possible that some features are only relevant to one class but irrelevant to all the other classes. From this point of view, it is necessary to undertake feature selection for each specific class, i.e, a relevant feature subset is selected for each specific class. In this paper, we propose the so-called multi-task feature selection approach for identifying features relevant to each target region towards effective image segmentation. This way of feature selection requires to transform a multi-class classification task into n binary classification tasks, where n is the number of classes. In particular, the Prism algorithm is used to produce a set of rules for class specific feature selection and the K nearest neighbour algorithm is used for training a classifier on a feature subset selected for each class. The experimental results show that the multi-task feature selection approach leads to an significant improvement of classification performance comparing with traditional feature selection approaches.
期刊：
Lecture Notes in Computer Science,2018年10976:726-737 ISSN：0302-9743
通讯作者：
Feng, Qilong
作者机构：
[Feng, Qilong; Lin, Mugang] Cent S Univ, Sch Informat Sci & Engn, Changsha, Hunan, Peoples R China.;[Lin, Mugang] Hengyang Normal Univ, Sch Comp Sci & Technol, Hengyang, Peoples R China.;[Lin, Mugang] Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang, Peoples R China.;[Fu, Bin] Univ Texas Rio Grande Valley, Dept Comp Sci, Edinburg, TX 78539 USA.
通讯机构：
[Feng, Qilong] C;Cent S Univ, Sch Informat Sci & Engn, Changsha, Hunan, Peoples R China.
会议名称：
24th International Computing and Combinatorics Conference (COCOON)
会议时间：
JUL 02-04, 2018
会议地点：
Qing Dao, PEOPLES R CHINA
会议主办单位：
[Lin, Mugang;Feng, Qilong] Cent S Univ, Sch Informat Sci & Engn, Changsha, Hunan, Peoples R China.^[Lin, Mugang] Hengyang Normal Univ, Sch Comp Sci & Technol, Hengyang, Peoples R China.^[Lin, Mugang] Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang, Peoples R China.^[Fu, Bin] Univ Texas Rio Grande Valley, Dept Comp Sci, Edinburg, TX 78539 USA.
会议论文集名称：
Lecture Notes in Computer Science
关键词：
Approximation algorithm;l-Pseudoforest Deletion problem;Local ratio
摘要：
An l-pseudoforest is a graph each of whose connected component is at most l edges away from being a tree. The l-Pseudoforest Deletion problem is to delete a vertex set P of minimum weight from a given vertex-weighted graph \(G=(V,E)\) such that the remaining graph \(G[V\setminus P]\) is an l-pseudoforest. The Feedback Vertex Set problem is a special case of the l-Pseudoforest Deletion problem with \(l=0\). In this paper, we present a polynomial time 4l-approximation algorithm for the l-Pseudoforest Deletion problem with \(l\ge 1\) by using the local ratio technique. When \(l=1\), we get a better approximation ratio 2 for the problem by further analyzing the algorithm, which matches the current best constant approximation factor for the Feedback Vertex Set problem.
作者：
Zhao, Hui-huang*;Liu, Han;Zheng, Jin-Hua;Fu, Bin
期刊：
2018 11TH INTERNATIONAL CONGRESS ON IMAGE AND SIGNAL PROCESSING, BIOMEDICAL ENGINEERING AND INFORMATICS (CISP-BMEI 2018),2018年:1-7
通讯作者：
Zhao, Hui-huang
作者机构：
[Zhao, Hui-huang] Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang, Peoples R China.;[Zheng, Jin-Hua; Zhao, Hui-huang] Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang, Hunan, Peoples R China.;[Liu, Han] Cardiff Univ, Sch Comp Sci & Informat, Cardiff, S Glam, Wales.;[Fu, Bin] Univ Texas Rio Grande Valley, Dept Comp Sci, Edinburg, TX USA.
通讯机构：
[Zhao, Hui-huang] H;Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang, Peoples R China.;Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang, Hunan, Peoples R China.
会议名称：
11th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)
会议时间：
OCT 13-15, 2018
会议地点：
Beijing, PEOPLES R CHINA
会议主办单位：
[Zhao, Hui-huang] Hengyang Normal Univ, Coll Comp Sci & Technol, Hengyang, Peoples R China.^[Zhao, Hui-huang;Zheng, Jin-Hua] Hunan Prov Key Lab Intelligent Informat Proc & Ap, Hengyang, Hunan, Peoples R China.^[Liu, Han] Cardiff Univ, Sch Comp Sci & Informat, Cardiff, S Glam, Wales.^[Fu, Bin] Univ Texas Rio Grande Valley, Dept Comp Sci, Edinburg, TX USA.
摘要：
This paper presents an occlusion robust tracking (ORT) method for multiple faces tracking. Given a video having multiple faces, we firstly detect faces in the first frame using the off-the-shelf face detector, and then extract wavelet packet transform (WPT) coefficients and color features from the detected faces, finally we design a back propagation (BP) neural network and track the faces by a particle filter and BP neural network. The main contribution is twofold. Firstly, the WPT coefficients combined with traditional color features is utilized to face tracking. It efficiently describes faces due to their discrimination and simplicity. Secondly, we propose an improved tracking method for occlusion robust tracking based on the BP neural network. When there is an occlusion, BP neural network learns from previous tracking results and is utilized to refine the current result from particle filter. Experimental results have been shown that our ORT method can handle the occlusion effectively and achieve better performance than several previous methods.
