期刊：
Physical Review A - Atomic, Molecular, and Optical Physics,2011年84(4) ISSN：2469-9926
通讯作者：
Li, J.(huajia_li@163.com)
作者机构：
[Zhang, Duo] Department of Mathematics and Physics, Wuhan Polytechnic University, Wuhan 430023, China;[Yang, Xiaoxue; Zhang, Duo; Ding, Chunling; Li, Jiahua; Xiong, Hao] Wuhan National Laboratory for Optoelectronics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
关键词：
Absorption measurements - Atom localization - Atom-field interaction - Atomic medium - Four-level atomic system - High resolution - High-precision - Microwave-driven - Probe field - Quantum interference - Standing-wave field - Two-dimensional atoms
摘要：
The behavior of two-dimensional (2D) atom localization is explored by monitoring the probe absorption in a microwave-driven four-level atomic medium under the action of two orthogonal standing-wave fields. Because of the position-dependent atom-field interaction, the information about the position of the atom can be obtained via the absorption measurement of the weak probe field. It is found that the localization behavior is significantly improved due to the joint quantum interference induced by the standing-wave and microwave-driven fields. Most importantly, the atom can be localized at a particular position and the maximal probability of finding the atom in one period of the standing-wave fields reaches unity by properly adjusting the system parameters. The proposed scheme may provide a promising way to achieve high-precision and high-resolution 2D atom localization.
作者机构：
[Fang, Chao] Department of Mathematics and Physics, Wuhan Polytechnic University, Wuhan 430023, China;[Zhou, Dongxiang; Fang, Chao; Gong, Shuping] Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan City Hubei Province 430074, China
通讯机构：
[Fang, Chao] Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Peoples R China.
作者机构：
[Kang, Zhen; Zeng, Shan] College of Mathematics and Computer Science, Wuhan Polytechnic University, Wuhan, Hubei, China;[Wang, Haibing] College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, Hubei, China;[Huang, Rui] NEC Laboratories China, Beijing, China
通讯机构：
[Huang, Rui] NEC Labs China, Beijing 100084, Peoples R China.
关键词：
Bayesian information criterion - Color quantization - Expectation-maximization algorithms - Gauss mixture models - Gaussian Mixture Model - Gaussian mixture model (GMMs) - Jensen-Shannon divergence - Spatiogram
摘要：
In this paper we propose a novel image representation method that characterizes an image as a spatiogram-a generalized histogram-of colors quantized by Gaussian Mixture Models (GMMs). First, we quantize the color space using a GMM, which is learned by the Expectation-Maximization (EM) algorithm from the training images. The number of Gaussian components (i.e., the number of quantized color bins) is determined automatically according to the Bayesian Information Criterion (BIC). Second, we incorporate the spatiogram representation with the quantized Gaussian mixture color model. Intuitively, a spatiogram is a histogram in which the distribution of colors is spatially weighted by the locations of the pixels contributing to each color bin. We have modified the spatiogram representation to fit our framework, which employs Gaussian color components instead of discrete color bins. Finally, the comparison between two images is achieved by measuring the similarity between two spatiograms, for which purpose we propose a new measurement adopting the Jensen-Shannon Divergence (JSD). We applied the new image representation and comparison method to the image retrieval task. The experiments on several publicly available COREL image datasets demonstrate the effectiveness of our proposed image representation for image retrieval. (C) 2015 Elsevier B.V. All rights reserved.
作者机构：
[Zhou, Wanlei; Rong, Jia; Ren, Yongli; Zhu, Tianqing] School of Information Technology, Deakin University, 221 Burwood Highway, VIC 3125, Australia;[Zhu, Tianqing] School of Mathematics and Computer Science, Wuhan Polytechnic University, 68 Xuefu Road, Wuhan 430023, China;[Xiong, Ping] School of Information and Security Engineering, Zhongnan University of Economics and Law, 182 Nanhu Road, Wuhan 430073, China
摘要：
As a popular technique in recommender systems, Collaborative Filtering (CF) has been the focus of significant attention in recent years, however, its privacy-related issues, especially for the neighborhood-based CF methods, cannot be overlooked. The aim of this study is to address these privacy issues in the context of neighborhood-based CF methods by proposing a Private Neighbor Collaborative Filtering (PNCF) algorithm. This algorithm includes two privacy preserving operations: Private Neighbor Selection and Perturbation. Using the item-based method as an example, Private Neighbor Selection is constructed on the basis of the notion of differential privacy; meaning that neighbors are privately selected for the target item according to its similarities with others. Recommendation-Aware Sensitivity and a re-designed differential privacy mechanism are introduced in this operation to enhance the performance of recommendations. A Perturbation operation then hides the true ratings of selected neighbors by adding Laplace noise. The PNCF algorithm reduces the magnitude of the noise introduced from the traditional differential privacy mechanism. Moreover, a theoretical analysis is provided to show that the proposed algorithm can resist a KNN attack while retaining the accuracy of recommendations. The results from experiments on two real datasets show that the proposed PNCF algorithm can obtain a rigid privacy guarantee without high accuracy loss. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
摘要：
In most methods for modeling mortality rates, the idiosyncratic shocks are assumed to be homoskedastic. This study investigates the conditional heteroskedasticity of mortality in terms of statistical time series. We start from testing the conditional heteroskedasticity of the period effect in the naive Lee-Carter model for some mortality data. Then we introduce the Generalized Dynamic Factor method and the multivariate BEKK GARCH model to describe mortality dynamics and the conditional heteroskedasticity of mortality. After specifying the number of static factors and dynamic factors by several variants of information criterion, we compare our model with other two models, namely, the Lee-Carter model and the state space model. Based on several error-based measures of performance, our results indicate that if the number of static factors and dynamic factors is properly determined, the method proposed dominates other methods. Finally, we use our method combined with Kalman filter to forecast the mortality rates of Iceland and period life expectancies of Denmark, Finland, Italy and Netherlands. (C) 2009 Elsevier B.V. All rights reserved.
期刊：
Advances in Difference Equations,2013年2013(1):148- ISSN：1687-1847
通讯作者：
Yang, Hua
作者机构：
[Feng Jiang] Zhongnan Univ Econ & Law, Sch Stat & Math, Wuhan, Hubei, Peoples R China.;[Hua Yang] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan, Hubei, Peoples R China.
通讯机构：
[Yang, Hua] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan, Hubei, Peoples R China.
摘要：
In this paper, we study the exponential stability in the p th moment of mild solutions to impulsive stochastic neutral partial differential equations with memory. Sufficient conditions ensuring the stability of the impulsive stochastic system are obtained by establishing a new integral inequality. The results obtained here generalize and improve some well-known results.
期刊：
JOURNAL OF INTERNET TECHNOLOGY,2016年17(6):1269-1277 ISSN：1607-9264
通讯作者：
Chou, Li-Der(cld@csie.ncu.edu.tw)
作者机构：
[Chao, Han-Chieh] School of Information Science and Engineering, Fujian University of Technology, China;[Chao, Han-Chieh] College of Mathematics and Computer Science, Wuhan Polytechnic University, China;[Chao, Han-Chieh] Department of Electrical Engineering, National Dong Hwa University, Taiwan;[Chao, Han-Chieh] Department of Computer Science and Information Engineering, National I-Lan University, Taiwan;[Tseng, Fan-Hsun; Chou, Li-Der] Department of Computer Science and Information Engineering, National Central University, Taiwan
摘要：
This paper presents an electrocardiographic signal classification method. This method first uses a revised locally linear embedding (LLE) algorithm to perform dimension reduction to the Electrocardiography (ECG) data. This manifold distance measurement-based LLE was proposed to solve the defect of conventional LLE that, due to the use of Euclidean distance, it could not properly measure the distance between high-dimensional samples. Using this revised LLE algorithm for the dimension reduction of data, more original data information could be retained, and the features of high-dimensional ECG data could be more effectively extracted, thereby improving the classification accuracy. The method then adopts kernel-based fuzzy C-means clustering algorithm to perform ECG signal classification. Classification tests on four common types of ECG signals-from the MIT-BIN database showed that the proposed method reached an overall accuracy of 99%.
期刊：
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics),2005年3823:817-824 ISSN：0302-9743
通讯作者：
Chen, Y.(chenyqwh@163.com)
作者机构：
[Chen, Yongqiang] Department of Computer and Information Engineering, Wuhan Polytechnic University, Wuhan, China;[Hu, Hanping; Chen, Yongqiang] Institute for Pattern Recognition and Artificial Intelligence, State Education Department Key Laboratory for Image Processing and Intelligent Control, Huazhong University of Science and Technology, Wuhan, China
作者机构：
[Tong Xiaojun; Chen Mianyun; Li Zhijun] Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
通讯机构：
[Tong, XJ] Wuhan Polytech Univ, Dept Math & Phys, Wuhan, Peoples R China.
会议名称：
12th Joint Conference of the World-Organization-of-Systems-and-Cybernetics/International-Institute-of -General-Systems-Studies
会议时间：
MAR, 2002
会议地点：
Pittsburgh, PA
会议主办单位：
Wuhan Polytech Univ, Dept Math & Phys, Wuhan, Peoples R China.^Huazhong Univ Sci & Technol, Dept Control Sci & Engn, Wuhan 430074, Peoples R China.
摘要：
This work was supported by the National Science Foundation (Grant No. 79970025, 69874018) and National Defence Science and Technology Foundation (Grant No. OOJ15.3.JWO528). Based on ideal absolute errors and relative errors, a new grey model‐GMp(1,1) model is presented. The existence problem of its solution is also solved based on a few conditions. Then, MGMp(1,n) model is presented. These optimized models GMp(1,n) and MGMp(1,n) have good anti‐noise property to absolute and relative errors. Examples illustrate that they have very good fitting and forecasting results.
会议名称：
2nd International Conference on Optimization and Control (ICOCO)
会议时间：
DEC 07-09, 2015
会议地点：
Chongqing, PEOPLES R CHINA
会议主办单位：
[Jiang, Feng] Zhongnan Univ Econ & Law, Sch Math & Stat, Wuhan 430073, Peoples R China.^[Yang, Hua] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan 430023, Peoples R China.^[Tian, Tianhai] Monash Univ, Sch Math Sci, Melbourne, Vic 3800, Australia.
关键词：
Ait-Sahalia-Rho model;boundedness;convergence in probability
摘要：
The Ait-Sahalia-Rho model is an important tool to study a number of financial problems, including the term structure of interest rate. However, since the functions of this model do not satisfy the linear growth condition, we cannot study the properties for the solution of this model by using the traditional techniques. In this paper we overcome the mathematical difficulties due to the nonlinear growth condition by using numerical simulation. Thus we first discuss analytical properties of the model and the convergence property of numerical solutions in probability for the Ait-Sahalia-Rho model. Finally, an example for option pricing is given to illustrate that the numerical solution is an effective method to estimate the expected payoffs.
作者机构：
[Sang, Nong; Huang, Rui] School of Automation, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;[Kang, Zhen; Zeng, Shan] College of Mathematics and Computer Science, Wuhan Polytechnic University, Wuhan, Hubei 430023, China
摘要：
A novel image segmentation method that combines spectral clustering and Gaussian mixture models is presented in this paper. The new method contains three phases. First, the image is partitioned into small regions modeled by a Gaussian Mixture Model (GMM), and the GMM is solved by an Expectation-Maximization (EM) algorithm with a newly proposed Image Reconstruction Criterion, named EM-IRC. Second, the distances among the GMM components are measured using Kullbacic-Leibler (KL) divergence, and a revised Floyd's algorithm developed from Zadeh's operations is used to build the similarity matrix based on those distances. Finally, spectral clustering is applied to this improved similarity matrix to merge the GMM components, i.e., the corresponding small image regions, to obtain the final segmentation result. Our contributions include the new EM-IRC algorithm, the revised Floyd's algorithm, and the novel overall framework. The experimental evaluation on the IRIS dataset and the real-world image segmentation problem demonstrates the effectiveness of our proposed approach. (C) 2014 Elsevier B.V. All rights reserved.
期刊：
Expert Systems with Applications,2014年41(2):744-751 ISSN：0957-4174
通讯作者：
Fang, H.(hjfang@mail.hust.edu.cn)
作者机构：
[Li, Zefang] Institute of Computer Technology and Software Engineering, Wuhan Polytechnic, 463 Guan-shan Road, Wuhan 430047, China;[Xia, Lisha; Fang, Huajing; Li, Zefang] Department of Control Science and Engineering, Huazhong University of Science and Technology, 1037 Luo-yu Road, Wuhan 430074, China
通讯机构：
[Fang, HJ] Huazhong Univ Sci & Technol, Dept Control Sci & Engn, 1037 Luo Yu Rd, Wuhan 430074, Peoples R China.
关键词：
Baum-Welch algorithms - Dynamic process monitoring - Hidden markov models (HMMs) - Memory complexity - Serial correlation - SIMPLER algorithms - Storage requirements - Tennessee Eastman process
作者机构：
[Chao, Han-Chieh] School of Information Science and Engineering, Fujian University of Technology, Fujian, China;[Chao, Han-Chieh] Department of Computer Science and Information Engineering, National Ilan University, Yilan, Taiwan;[Chao, Han-Chieh] Department of Electrical Engineering, National Dong Hwa University, Hualien, Taiwan;[Chao, Han-Chieh] College of Mathematics and Computer Science, Wuhan Polytechnic University, Wuhan, China;[Cheng, Wen-Huang] Research Center for Information Technology Innovation (CITI), Academia Sinica, Taipei, Taiwan
通讯机构：
[Srinivasan, Kathiravan] Natl Ilan Univ, Dept Comp Sci & Informat Engn, Yilan, Yilan County, Taiwan.
摘要：
With hard requirements of high performance for the next generation mobile communication systems, especially 5G networks, coverage has been the crucial problem which requires the deployment of more stations by the service providers. However, this deployment of new stations is not cost effective and requires network replanning. This issue can easily be overcome by the use of Unmanned Aerial Vehicles (UAVs) in the existing communication system. Thus, considering this as a problem, an intelligent solution is presented for the accurate and efficient placement of the UAVs with respect to the demand areas resulting in the increase in the capacity and coverage of the wireless networks. The proposed approach utilizes the priority-wise dominance and the entropy approaches for providing solutions to the two problems considered in this paper, namely, Macro Base Station (MBS) decision problem and the cooperative UAV allocation problem. Finally, network bargaining is defined over these solutions to accurately map the UAVs to the desired areas resulting in the significant improvement of the network parameters, namely, throughput, per User Equipment (UE) capacity, 5th percentile spectral efficiency, network delays and guaranteed signal to interference plus noise ratio by 6.3%, 16.6%, 55.9%, 48.2%, and 36.99%, respectively in comparison with the existing approaches.
期刊：
Asian Journal of Control,2016年18(1):266-272 ISSN：1934-6093
通讯作者：
Zhao, JM
作者机构：
[Zhang, Lijun] School of Marine, Northwestern Polytechnical University, Xian, China;[Qi, Xue] School of Science, Anhui Science and Technology University, Bengbu, China;[Zhao, Jiemei] School of Mathematic and Computer Science, Wuhan Polytechnic University, Wuhan, China
通讯机构：
[Zhao, Jiemei] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan 430023, Peoples R China.
摘要：
In this paper, a necessary and sufficient condition for generalized quadratic stabilization of switched descriptor time‐delay (SDT) systems under arbitrary switching is investigated. Based on the linear matrix inequality (LMI) method, some results are given: (i) the SDT system is regular, impulse‐free, and stable under arbitrary switching; (ii) the necessary and sufficient condition for switched generalized quadratic stability (stabilization) of the uncertain SDT systems is derived. Finally, a numerical example is provided to illustrate the effectiveness of the method.
作者机构：
[Chen, Xiqu; Lv, Qiang] Department of Mathematics and Physics, Wuhan Polytechnic University, Wuhan, Hubei 430023, China;[Yi, Xinjian] Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China;[Yi, Xinjian] Department of Optoelectronic Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
通讯机构：
[Chen, Xiqu] Wuhan Polytech Univ, Dept Math & Phys, Wuhan 430023, Hubei, Peoples R China.
关键词：
Current responsivity;Micro-bolometer;Pulsed voltage bias
作者：
Qian, Yuntao*;Xiong, Fengchao;Zeng, Shan;Zhou, Jun;Tang, Yuan Yan
期刊：
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,2017年55(3):1776-1792 ISSN：0196-2892
通讯作者：
Qian, Yuntao
作者机构：
[Qian, Yuntao; Xiong, Fengchao] College of Computer Science, Institute of Artificial Intelligence, Zhejiang University, Hangzhou, 310027, China;[Zhou, Jun] School of Information and Communication Technology, Griffith University, Nathan, 4111, Australia;[Tang, Yuan Yan] Faculty of Science and Technology, University of Macau, Macau, 999078, China;[Zeng, Shan] College of Mathematics and Computer Science, Wuhan Polytechnic University, Wuhan, 430023, China
摘要：
Sticker model is imitated by using set, variable length vector and biochemistry operator instead of tube, memory strand and biochemistry experiment for the first time. Batch separation operator and electrophoresis operator are first put forward based on DNA algorithm of Set Covering Problem (SCP) based on sticker model. Expression way, calculation method and basic properties of variable length vector and the two biochemistry operators are analyzed in detail according to the characteristics of sticker model. Simulation DNA algorithm (SDA) of SCP, which can find out all optimization set coverings, is designed, where all feasible set coverings are extracted by using batch separation operator and all optimization set coverings are extracted by using electrophoresis operator. Minimal element and deriving element are first introduced. And minimal element contains a large amount of deriving elements, so the set of batch separation operator can be simplified. Less-than relation is established to simplify the set of electrophoresis operator. Therefore the use of 'minimal element' and 'less-than' makes SDA of SCP more effective and practical. Time complexity of SDA of SCP is proved, and it shows that SDA of SCP is an effective algorithm to solve SCP.