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学者姓名：乔元华
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摘要 ：
In this paper, a modified Leslie-type predator-prey model with simplified Holling type IV functional response is established, in which double Allee effect on prey and nonlinear prey harvesting are considered. The analysis of the model shows that there exists a Bogdanov-Takens singularity (focus case) of codimension 4, and also multiple other nonhyperbolic and degenerate equilibria. Bifurcations are explored and it is found that transcritical bifurcation, saddle-node bifurcation, Bogdanov-Takens bifurcation of codimension 2, degenerate cusp type Bogdanov-Takens bifurcation of codimension 3, and degenerate focus type Bogdanov-Takens bifurcation of codimension 4 occur as parameters vary. The bifurcations result in complex dynamic behaviors, such as double limit cycle, triple limit cycle, quadruple limit cycle, cuspidal loop, (multiple) homoclinic loop, saddle-node loop, and limit cycle(s) simultaneously with homoclinic loop. We run numerical simulations to verify the theoretical results, and it is found that the system admits bistability, tristability, or even tetrastability.(c) 2022 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
关键词 ：
Predator-prey model Predator-prey model Degenerate focus type Bogdanov-Takens bifurcation of codimension 4 Degenerate focus type Bogdanov-Takens bifurcation of codimension 4 Nonlinear harvesting Nonlinear harvesting Double Allee effect Double Allee effect
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| GB/T 7714 | Shang, Zuchong , Qiao, Yuanhua . Multiple bifurcations in a predator-prey system of modified Holling and Leslie type with double Allee effect and nonlinear harvesting [J]. | MATHEMATICS AND COMPUTERS IN SIMULATION , 2023 , 205 : 745-764 . |
| MLA | Shang, Zuchong 等. "Multiple bifurcations in a predator-prey system of modified Holling and Leslie type with double Allee effect and nonlinear harvesting" . | MATHEMATICS AND COMPUTERS IN SIMULATION 205 (2023) : 745-764 . |
| APA | Shang, Zuchong , Qiao, Yuanhua . Multiple bifurcations in a predator-prey system of modified Holling and Leslie type with double Allee effect and nonlinear harvesting . | MATHEMATICS AND COMPUTERS IN SIMULATION , 2023 , 205 , 745-764 . |
| 导入链接 | NoteExpress RIS BibTex |
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 ：
Predator-prey system Predator-prey system Hopf bifurcation Hopf bifurcation Bogdanov-Takens bifurcation Bogdanov-Takens bifurcation Limit cycle(s) Limit cycle(s) Allee effect Allee effect
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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 . |
| 导入链接 | NoteExpress RIS BibTex |
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 ：
Sleep staging is one of the important methods to diagnosis and treatment of sleep diseases. However, it is laborious and time-consuming, therefore, computer assisted sleep staging is necessary. Most of the existing sleep staging researches using hand-engineered features rely on prior knowledges of sleep analysis, and usually single channel electroencephalogram (EEG) is used for sleep staging task. Prior knowledge is not always available, and single channel EEG signal cannot fully represent the patient's sleeping physiological states. To tackle the above two problems, we propose an automatic sleep staging network model based on data adaptation and multimodal feature fusion using EEG and electrooculogram (EOG) signals. 3D-CNN is used to extract the time-frequency features of EEG at different time scales, and LSTM is used to learn the frequency evolution of EOG. The nonlinear relationship between the High-layer features of EEG and EOG is fitted by deep probabilistic network. Experiments on SLEEP-EDF and a private dataset show that the proposed model achieves state-of-the-art performance. Moreover, the prediction result is in accordance with that from the expert diagnosis.
关键词 ：
sleep stage classification sleep stage classification deep learning deep learning HHT HHT multimodal physiological signals multimodal physiological signals fusion networks fusion networks
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| GB/T 7714 | Duan, Lijuan , Li, Mengying , Wang, Changming et al. A Novel Sleep Staging Network Based on Data Adaptation and Multimodal Fusion [J]. | FRONTIERS IN HUMAN NEUROSCIENCE , 2021 , 15 . |
| MLA | Duan, Lijuan et al. "A Novel Sleep Staging Network Based on Data Adaptation and Multimodal Fusion" . | FRONTIERS IN HUMAN NEUROSCIENCE 15 (2021) . |
| APA | Duan, Lijuan , Li, Mengying , Wang, Changming , Qiao, Yuanhua , Wang, Zeyu , Sha, Sha et al. A Novel Sleep Staging Network Based on Data Adaptation and Multimodal Fusion . | FRONTIERS IN HUMAN NEUROSCIENCE , 2021 , 15 . |
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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 ：
Degenerate Hopf bifurcation Degenerate Hopf bifurcation Harvesting Harvesting Bogdanov-Takens bifurcation Bogdanov-Takens bifurcation Predator-prey system Predator-prey system Limit cycle Limit cycle
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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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
We study the bifurcation diagrams and exact multiplicity of positive solutions for the one-dimensional prescribed mean curvature equation {-(u'/root 1 + u'(2))' = lambda(u/1 + u)(p), -L < x < L, u(-L) = u(L) = 0, where. is a bifurcation parameter, and L, p > 0 are two evolution parameters. We prove that on the (lambda, parallel to u parallel to(infinity))-plane, for 0 < p <= root 2/4, the bifurcation curve is superset of-shaped bifurcation starting from (0, 0). And for p = 1, f(u) = u/1+u is a logistic function, then the bifurcation curve is also superset of-shaped bifurcation starting from (pi(2)/4L(2), 0). While for p > 1, the bifurcation curve is reversed e-like shaped bifurcation if L > L*, and isexactly decreasing for lambda > lambda* if 0 < L < L-*.
关键词 ：
bifurcation curve bifurcation curve mean curvature mean curvature logistic function logistic function
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| GB/T 7714 | Zhang, Jiajia , Qiao, Yuanhua , Duan, Lijuan et al. On the evolutionary bifurcation curves for the one-dimensional prescribed mean curvature equation with logistic type [J]. | OPEN MATHEMATICS , 2021 , 19 (1) : 927-939 . |
| MLA | Zhang, Jiajia et al. "On the evolutionary bifurcation curves for the one-dimensional prescribed mean curvature equation with logistic type" . | OPEN MATHEMATICS 19 . 1 (2021) : 927-939 . |
| APA | Zhang, Jiajia , Qiao, Yuanhua , Duan, Lijuan , Miao, Jun . On the evolutionary bifurcation curves for the one-dimensional prescribed mean curvature equation with logistic type . | OPEN MATHEMATICS , 2021 , 19 (1) , 927-939 . |
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