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学者姓名：乔元华
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摘要 ：
In this paper, a Leslie-type predator-prey system with simplified Holling type IV functional response and strong Allee effect on prey is proposed. The dissipativity of the system and the existence of all possible equilibria are investigated. The investigation emphasizes the exploring of bifurcation. It is shown that the system exists several non-hyperbolic positive equilibria, such as a weak focus of multiplicities one and two, (degenerate) saddle-nodes and Bogdanov-Takens singularities (cusp case) of codimensions 2 and 3. At these equilibria, it is proved that the system undergoes various kinds of bifurcations, such as saddle-node bifurcation, Hopf bifurcation, degenerate Hopf bifurcation and Bogdanov-Takens bifurcation of codimensions 2 and 3. With the parameters selected properly, there exhibits a limit cycle, a homoclinic loop, two limit cycles, a semistable limit cycle, or the simultaneous occurrence of a homoclinic loop and a limit cycle in the system. Moreover, it is also proved that the system has a cusp of codimension at least 4. Hence, there may exist three limit cycles generated from Hopf bifurcation of codimension 3. Numerical simulations are done to support the theoretical results. (C) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Allee effect Allee effect Bogdanov-Takens bifurcation Bogdanov-Takens bifurcation Hopf bifurcation Hopf bifurcation Limit cycle(s) Limit cycle(s) Predator-prey system Predator-prey system
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| GB/T 7714 | Shang, Zuchong , Qiao, Yuanhua . Bifurcation analysis of a Leslie-type predator-prey system with simplified Rolling type IV functional response and strong Allee effect on prey [J]. | NONLINEAR ANALYSIS-REAL WORLD APPLICATIONS , 2022 , 64 . |
| MLA | Shang, Zuchong 等. "Bifurcation analysis of a Leslie-type predator-prey system with simplified Rolling type IV functional response and strong Allee effect on prey" . | NONLINEAR ANALYSIS-REAL WORLD APPLICATIONS 64 (2022) . |
| APA | Shang, Zuchong , Qiao, Yuanhua . Bifurcation analysis of a Leslie-type predator-prey system with simplified Rolling type IV functional response and strong Allee effect on prey . | NONLINEAR ANALYSIS-REAL WORLD APPLICATIONS , 2022 , 64 . |
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摘要 ：
基于改进EAST的文本检测算法
关键词 ：
BLSTM神经网络 BLSTM神经网络 文本识别 文本识别 EAST EAST ASPP网络 ASPP网络
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| GB/T 7714 | 王俊 , 苗军 , 卿来云 et al. 基于改进EAST的文本检测算法 [J]. | 王俊 , 2021 , 11 (1) : 167-175 . |
| MLA | 王俊 et al. "基于改进EAST的文本检测算法" . | 王俊 11 . 1 (2021) : 167-175 . |
| APA | 王俊 , 苗军 , 卿来云 , 乔元华 , 计算机科学与应用 . 基于改进EAST的文本检测算法 . | 王俊 , 2021 , 11 (1) , 167-175 . |
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摘要 ：
自然场景文本定位检测是文本识别的研究热点之一。EAST算法是目前自然场景文本定位检测算法较为出色的算法之一，在ICDAR2015数据集上，有着较高的准确率和召回率。但EAST算法仍存在着感受野不够大、长文本检测效果不佳的问题。因此本实验对EAST算法进行改进，通过改进EAST算法的结构，加入了ASPP网络，扩大感受野，加入了BLSTM神经网络，增强了文本之间的关联，提高文本定位效果。实验结果表明，该算法在ICDAR2015文本定位任务上的召回率为77.84%，精确率为86.24%，F-score为81.82%，优于经典EAST算法。
关键词 ：
ASPP网络 ASPP网络 BLSTM神经网络 BLSTM神经网络 Text Recognition Text Recognition ASPP Network ASPP Network 文本识别 文本识别 EAST EAST BLSTM Neural Network BLSTM Neural Network
引用：
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| GB/T 7714 | 王俊 , 苗军 , 卿来云 et al. 基于改进EAST的文本检测算法 [J]. | 计算机科学与应用 , 2021 , 11 (01) : 167-175 . |
| MLA | 王俊 et al. "基于改进EAST的文本检测算法" . | 计算机科学与应用 11 . 01 (2021) : 167-175 . |
| APA | 王俊 , 苗军 , 卿来云 , 乔元华 . 基于改进EAST的文本检测算法 . | 计算机科学与应用 , 2021 , 11 (01) , 167-175 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
近年来,全卷积神经网络有效提升了语义分割任务的准确率.然而,由于室内环境的复杂性,室内场景语义分割仍然是一个具有挑战性的问题.随着深度传感器的出现,人们开始考虑利用深度信息提升语义分割效果.以往的研究大多简单地使用等权值的拼接或求和操作来融合RGB特征和深度特征,未能充分利用RGB特征与深度特征之间的互补信息.本文提出一种基于注意力感知和语义感知的网络模型ASNet(Attention-aware and Semantic-aware Network).通过引入注意力感知多模态融合模块和语义感知多模态融合模块,有效地融合多层次的RGB特征和深度特征.其中,在注意力感知多模态融合模块中,本文设计...
关键词 ：
深度学习 深度学习 RGB-D语义分割 RGB-D语义分割 卷积神经网络 卷积神经网络 注意力模型 注意力模型 多模态融合 多模态融合
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| GB/T 7714 | 段立娟 , 孙启超 , 乔元华 et al. 基于注意力感知和语义感知的RGB-D室内图像语义分割算法 [J]. | 计算机学报 , 2021 , 44 (02) : 275-291 . |
| MLA | 段立娟 et al. "基于注意力感知和语义感知的RGB-D室内图像语义分割算法" . | 计算机学报 44 . 02 (2021) : 275-291 . |
| APA | 段立娟 , 孙启超 , 乔元华 , 陈军成 , 崔国勤 . 基于注意力感知和语义感知的RGB-D室内图像语义分割算法 . | 计算机学报 , 2021 , 44 (02) , 275-291 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The dynamical behaviors of a Leslie type predator-prey system are explored when the functional response is increasing for both predator and prey. Qualitative and quantitative analysis methods based on stability theory, bifurcation theory and numerical simulation are adopted. It is showed that the system is dissipative and permanent, and its solutions are bounded. Global stability of the unique positive equilibrium is investigated by constructing Dulac function and applying Poincare-Bendixson theorem. The bifurcation behaviors are further explored and the number of limit cycles is determined. By calculating the first Lyapunov number and the first two focus values, it is proved that the positive equilibrium is not a center but a weak focus of multiplicity at most two, so the system undergoes Hopf bifurcation and Bautin bifurcation. The normal form of Bautin bifurcation is also obtained by introducing the complex system. Moreover, numerical simulations are run to demonstrate the validity of theoretical results.
关键词 ：
Bautin bifurcation Bautin bifurcation Global stability Global stability Hopf bifurcation Hopf bifurcation Limit cycle Limit cycle Predator-prey system Predator-prey system
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| GB/T 7714 | Shang, Zuchong , Qiao, Yuanhua , Duan, Lijuan et al. Bifurcation analysis and global dynamics in a predator-prey system of Leslie type with an increasing functional response [J]. | ECOLOGICAL MODELLING , 2021 , 455 . |
| MLA | Shang, Zuchong et al. "Bifurcation analysis and global dynamics in a predator-prey system of Leslie type with an increasing functional response" . | ECOLOGICAL MODELLING 455 (2021) . |
| APA | Shang, Zuchong , Qiao, Yuanhua , Duan, Lijuan , Miao, Jun . Bifurcation analysis and global dynamics in a predator-prey system of Leslie type with an increasing functional response . | ECOLOGICAL MODELLING , 2021 , 455 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
基于注意力感知和语义感知的RGB-D室内图像语义分割算法
关键词 ：
RGB-D语义分割 RGB-D语义分割 卷积神经网络 卷积神经网络 多模态融合 多模态融合 注意力模型 注意力模型 深度学习 深度学习
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 段立娟 , 孙启超 , 乔元华 et al. 基于注意力感知和语义感知的RGB-D室内图像语义分割算法 [J]. | 段立娟 , 2021 , 44 (2) : 275-291 . |
| MLA | 段立娟 et al. "基于注意力感知和语义感知的RGB-D室内图像语义分割算法" . | 段立娟 44 . 2 (2021) : 275-291 . |
| APA | 段立娟 , 孙启超 , 乔元华 , 陈军成 , 崔国勤 , 计算机学报 . 基于注意力感知和语义感知的RGB-D室内图像语义分割算法 . | 段立娟 , 2021 , 44 (2) , 275-291 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Multidirectional associative memory neural networks (MAMNNs) are constructed to simulate the many-to-many association, and they are applied widely in many fields. It is important to explore the global stability of the periodic solution of MAMNNs. In this paper, MAMNNs with discontinuous activation functions and mixed time-varying delays are considered. Firstly, we investigate the conditions for the existence of the periodic solution by using the Mawhin-like coincidence theorem, and a special connecting weight matrix is constructed to prove the existence of the periodic solution. Secondly, the uniqueness and global exponential stability of the periodic solution are explored for the non-self-connected system by introducing a Lipschitz-like condition. Finally, numerical simulations are given to illustrate the effectiveness of our main results.
关键词 ：
discontinuous activation functions discontinuous activation functions global exponential stability global exponential stability mixed time‐ mixed time‐ multidirectional associative memory neural networks multidirectional associative memory neural networks periodic solution periodic solution varying delays varying delays
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| GB/T 7714 | Zhang, Yan , Qiao, Yuanhua , Duan, Lijuan et al. Periodic dynamics of multidirectional associative neural networks with discontinuous activation functions and mixed time delays [J]. | INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL , 2021 , 31 (10) : 4570-4588 . |
| MLA | Zhang, Yan et al. "Periodic dynamics of multidirectional associative neural networks with discontinuous activation functions and mixed time delays" . | INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL 31 . 10 (2021) : 4570-4588 . |
| APA | Zhang, Yan , Qiao, Yuanhua , Duan, Lijuan , Miao, Jun , Zhang, Jiajia . Periodic dynamics of multidirectional associative neural networks with discontinuous activation functions and mixed time delays . | INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL , 2021 , 31 (10) , 4570-4588 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this paper, a type of fractional-order quaternion-valued neural networks (FOQVNNs) with leakage and time-varying delays is established to simulate real-world situations, and the global Mittag-Leffler stability of the system is investigated by using the non-decomposition method. First, to avoid decomposing the system into two complex-valued systems or four real-valued systems, a new sign function for quaternion numbers is introduced based on the ones for real and complex numbers. And two novel lemmas for quaternion-valued sign function and Caputo fractional derivative are established in quaternion domain, which are used to investigate the stability of FOQVNNs. Second, a concise and flexible quaternion-valued state feedback controller is directly designed and a novel 1-norm Lyapunov function composed of the absolute values of real and imaginary parts is established. Then, based on the designed quaternion-valued state feedback controller and the proposed lemmas, some sufficient conditions are given to ensure the global Mittag-Leffler stability of the system. Finally, a numerical simulation is given to verify the theoretical results. (C) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Fractional-order Fractional-order Leakage delay Leakage delay Mittag-Leffler stability Mittag-Leffler stability Quaternion-valued neural networks Quaternion-valued neural networks Time-varying delay Time-varying delay
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| GB/T 7714 | Yan, Hongyun , Qiao, Yuanhua , Duan, Lijuan et al. Novel methods to global Mittag-Leffler stability of delayed fractional-order quaternion-valued neural networks [J]. | NEURAL NETWORKS , 2021 , 142 : 500-508 . |
| MLA | Yan, Hongyun et al. "Novel methods to global Mittag-Leffler stability of delayed fractional-order quaternion-valued neural networks" . | NEURAL NETWORKS 142 (2021) : 500-508 . |
| APA | Yan, Hongyun , Qiao, Yuanhua , Duan, Lijuan , Miao, Jun . Novel methods to global Mittag-Leffler stability of delayed fractional-order quaternion-valued neural networks . | NEURAL NETWORKS , 2021 , 142 , 500-508 . |
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摘要 ：
In this paper, we propose a deep multimodal feature learning (DMFL) network for RGB-D salient object detection. The color and depth features are firstly extracted from low level to high level feature using CNN. Then the features at the high layer are shared and concatenated to construct joint feature representation of multi-modalities. The fused features are embedded to a high dimension metric space to express the salient and non-salient parts. And also a new objective function, consisting of cross-entropy and metric loss, is proposed to optimize the model. Both pixel and attribute level discriminative features are learned for semantical grouping to detect the salient objects. Experimental results show that the proposed model achieves promising performance and has about 1% to 2% improvement to conventional methods. © 2021 Elsevier Ltd
关键词 ：
Deep learning Deep learning Feature extraction Feature extraction Object detection Object detection Object recognition Object recognition Set theory Set theory Topology Topology
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| GB/T 7714 | Liang, Fangfang , Duan, Lijuan , Ma, Wei et al. A deep multimodal feature learning network for RGB-D salient object detection [J]. | Computers and Electrical Engineering , 2021 , 92 . |
| MLA | Liang, Fangfang et al. "A deep multimodal feature learning network for RGB-D salient object detection" . | Computers and Electrical Engineering 92 (2021) . |
| APA | Liang, Fangfang , Duan, Lijuan , Ma, Wei , Qiao, Yuanhua , Miao, Jun . A deep multimodal feature learning network for RGB-D salient object detection . | Computers and Electrical Engineering , 2021 , 92 . |
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摘要 ：
In this paper, a Gause type predator-prey system with constant-yield prey harvesting and monotone ascending functional response is proposed and investigated. We focus on the influence of the harvesting rate on the predator-prey system. First, equilibria corresponding to different situations are investigated, as well as the stability analysis. Then bifurcations are explored at nonhyperbolic equilibria, and we give the conditions for the occurrence of two saddle-node bifurcations by analyzing the emergence, coincidence and annihilation of equilibria. We calculate the Lyapunov number and focal values to determine the stability and the quantity of limit cycles generated by supercritical, subcritical and degenerate Hopf bifurcations. Furthermore, the system is unfolded to explore the repelling and attracting Bogdanov-Takens bifurcations by perturbing two bifurcation parameters near the cusp. It is shown that there exists one limit cycle, or one homoclinic loop, or two limit cycles for different parameter values. Therefore, the system is susceptible to both the constant-yield prey harvesting and initial values of the species. Finally, we run numerical simulations to verify the theoretical analysis. (C) 2021 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
关键词 ：
Bogdanov-Takens bifurcation Bogdanov-Takens bifurcation Degenerate Hopf bifurcation Degenerate Hopf bifurcation Harvesting Harvesting Limit cycle Limit cycle Predator-prey system Predator-prey system
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| GB/T 7714 | Shang, Zuchong , Qiao, Yuanhua , Duan, Lijuan et al. Bifurcation analysis in a predator-prey system with an increasing functional response and constant-yield prey harvesting [J]. | MATHEMATICS AND COMPUTERS IN SIMULATION , 2021 , 190 : 976-1002 . |
| MLA | Shang, Zuchong et al. "Bifurcation analysis in a predator-prey system with an increasing functional response and constant-yield prey harvesting" . | MATHEMATICS AND COMPUTERS IN SIMULATION 190 (2021) : 976-1002 . |
| APA | Shang, Zuchong , Qiao, Yuanhua , Duan, Lijuan , Miao, Jun . Bifurcation analysis in a predator-prey system with an increasing functional response and constant-yield prey harvesting . | MATHEMATICS AND COMPUTERS IN SIMULATION , 2021 , 190 , 976-1002 . |
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