Int. J. Bifurc. Chaos最新文献_第7页

Genesis of Noise-Induced Multimodal Chaotic Oscillations in Enzyme Kinetics: Stochastic Bifurcations and Sensitivity Analysis 酶动力学中噪声诱导的多模态混沌振荡的成因:随机分岔和灵敏度分析

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423300136

I. Bashkirtseva

引用次数: 0

Irreversibility of 2D Linear CA and Garden of Eden 二维线性CA的不可逆性与伊甸园

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423500657

Doston Jumaniyozov, B. Omirov, Shovkat Redjepov, S. Uguz

引用次数: 0

Dynamics of Delayed Neuroendocrine Systems and Their Reconstructions Using Sparse Identification and Reservoir Computing 迟发性神经内分泌系统动力学及其稀疏识别和储层计算重建

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423300148

Penghe Ge, Hongjun Cao

{"title":"Dynamics of Delayed Neuroendocrine Systems and Their Reconstructions Using Sparse Identification and Reservoir Computing","authors":"Penghe Ge, Hongjun Cao","doi":"10.1142/s0218127423300148","DOIUrl":"https://doi.org/10.1142/s0218127423300148","url":null,"abstract":"Neuroendocrine system mainly consists of hypothalamus, anterior pituitary, and target organ. In this paper, a three-state-variable delayed Goodwin model with two Hill functions is considered, where the Hill functions with delays denote the hormonal feedback suppressions from target organ to hypothalamus and to anterior in the reproductive hormonal axis. The existence of Hopf bifurcation shows the circadian rhythms of neuroendocrine system. The direction and stability of Hopf bifurcation are also analyzed using the normal form theory and the center manifold theorem for functional differential equations. Furthermore, based on the sparse identification algorithm, it is verified that the transient time series generated from the delayed Goodwin model cannot be equivalently presented by ordinary differential equations from the viewpoint of data when considering that a library of candidates are at most cubic terms. The reason is because the solution space of delayed differential equations is of infinite dimensions. Finally, we report that reservoir computing can predict the periodic behaviors of the delayed Goodwin model accurately if the size of reservoir and the length of data used for training are large enough. The predicting performances are evaluated by the mean squared errors between the trajectories generated from the numerical simulations and the reservoir computing.","PeriodicalId":13688,"journal":{"name":"Int. J. Bifurc. Chaos","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72866394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Nondegenerate n-Dimensional Hyperchaotic Map Model with Application in a Keyed Parallel Hash Function 一个非退化的n维超混沌映射模型及其在键控并行哈希函数中的应用

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423500700

Mengdi Zhao, Hongjun Liu

{"title":"A Nondegenerate n-Dimensional Hyperchaotic Map Model with Application in a Keyed Parallel Hash Function","authors":"Mengdi Zhao, Hongjun Liu","doi":"10.1142/s0218127423500700","DOIUrl":"https://doi.org/10.1142/s0218127423500700","url":null,"abstract":"The construction of multidimensional discrete hyperchaotic maps with ergodicity and larger Lyapunov exponents is desired in cryptography. Here, we have designed a general [Formula: see text]D ([Formula: see text]) discrete hyperchaotic map ([Formula: see text]D-DHCM) model that can generate any nondegenerate [Formula: see text]D chaotic map with Lyapunov exponents of desired size through setting the control matrix. To verify the effectiveness of the [Formula: see text]D-DHCM, we have provided two illustrative examples and analyzed their dynamic behavior, and the results demonstrated that their state points have ergodicity within a sufficiently large interval. Furthermore, to address the finite precision effect of the simulation platform, we analyzed the relationship between the size of Lyapunov exponent and the randomness of the corresponding state time sequence of the [Formula: see text]D-DHCM. Finally, we designed a keyed parallel hash function based on a 6D-DHCM to evaluate the practicability of the [Formula: see text]D-DHCM. Experimental results have demonstrated that [Formula: see text]D discrete chaotic maps constructed using [Formula: see text]D-DHCM have desirable Lyapunov exponents, and can be applied to practical applications.","PeriodicalId":13688,"journal":{"name":"Int. J. Bifurc. Chaos","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82312958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of Reservoir Computing Based on a 2D Hyperchaotic Discrete Memristive Map in Efficient Temporal Signal Processing 基于二维超混沌离散记忆映射的储层计算在有效时间信号处理中的应用

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s021812742330015x

Shengjie Xu, Jing Ren, Musha Ji’e, Shukai Duan, Lidan Wang

引用次数: 3

Existence of Four-Intersection-Point Limit Cycles with Only Saddles Separated by Two Parallel Straight Lines in Planar Piecewise Linear Systems 平面分段线性系统中仅鞍被两条平行直线隔开的四交点极限环的存在性

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423500712

Xiao-Juan Liu, Xiao-Song Yang

引用次数: 0

Some Jerk Systems with Hidden Chaotic Dynamics 一些具有隐藏混沌动力学的激振系统

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423500694

Bingxue Li, B. Sang, Mei Liu, Xiaoyan Hu, Xue Zhang, Ning Wang

{"title":"Some Jerk Systems with Hidden Chaotic Dynamics","authors":"Bingxue Li, B. Sang, Mei Liu, Xiaoyan Hu, Xue Zhang, Ning Wang","doi":"10.1142/s0218127423500694","DOIUrl":"https://doi.org/10.1142/s0218127423500694","url":null,"abstract":"Hidden chaotic attractors is a fascinating subject of study in the field of nonlinear dynamics. Jerk systems with a stable equilibrium may produce hidden chaotic attractors. This paper seeks to enhance our understanding of hidden chaotic dynamics in jerk systems of three variables [Formula: see text] with nonlinear terms from a predefined set: [Formula: see text], where [Formula: see text] is a real parameter. The behavior of the systems is analyzed using rigorous Hopf bifurcation analysis and numerical simulations, including phase portraits, bifurcation diagrams, Lyapunov spectra, and basins of attraction. For certain jerk systems with a subcritical Hopf bifurcation, adjusting the coefficient of a linear term can lead to hidden chaotic behavior. The adjustment modifies the subcritical Hopf equilibrium, transforming it from an unstable state to a stable one. One such jerk system, while maintaining its equilibrium stability, experiences a sudden transition from a point attractor to a stable limit cycle. The latter undergoes a period-doubling route to chaos, which may be followed by a reverse route. Therefore, by perturbing certain jerk systems with a subcritical Hopf equilibrium, we can gain insights into the formation of hidden chaotic attractors. Furthermore, adjusting the coefficient of the nonlinear term [Formula: see text] in certain systems with a stable equilibrium can also lead to period-doubling routes or reverse period-doubling routes to hidden chaotic dynamics. Both findings are significant for our understanding of the hidden chaotic dynamics that can emerge from nonlinear systems with a stable equilibrium.","PeriodicalId":13688,"journal":{"name":"Int. J. Bifurc. Chaos","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72903770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Piecewise Smooth Perturbations to a Class of Planar Cubic Centers 一类平面三次中心的分段光滑摄动

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423500682

Linping Peng, Yue Li, Dandi Sun

引用次数: 0

Efficient Neuromorphic Reservoir Computing Using Optoelectronic Memristors for Multivariate Time Series Classification 基于光电忆阻器的多元时间序列分类高效神经形态储层计算

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423500761

Jing Su, Jiale Lu, Fan Sun, G. Zhou, Shukai Duan, Xiaofang Hu

{"title":"Efficient Neuromorphic Reservoir Computing Using Optoelectronic Memristors for Multivariate Time Series Classification","authors":"Jing Su, Jiale Lu, Fan Sun, G. Zhou, Shukai Duan, Xiaofang Hu","doi":"10.1142/s0218127423500761","DOIUrl":"https://doi.org/10.1142/s0218127423500761","url":null,"abstract":"Reservoir computing (RC) has attracted much attention as a brain-like neuromorphic computing algorithm for time series processing. In addition, the hardware implementation of the RC system can significantly reduce the computing time and effectively apply it to edge computing, showing a wide range of applications. However, many hardware implementations of RC use different hardware to implement standard RC without further expanding the RC architecture, which makes it challenging to deal with relatively complex time series tasks. Therefore, we propose a bidirectional hierarchical light reservoir computing method using optoelectronic memristors as the basis for the hardware implementation. The approach improves the performance of hardware-implemented RC by allowing the memristor to capture multilevel temporal information and generate a variety of reservoir states. Ag[Formula: see text]GQDs[Formula: see text]TiOx[Formula: see text]FTO memristors with negative photoconductivity effects can map temporal inputs nonlinearly to reservoir states and are used to build physical reservoirs to accomplish higher-speed operations. The method’s effectiveness is demonstrated in multivariate time series classification tasks: a predicted accuracy of 98.44[Formula: see text] is achieved in voiceprint recognition and 99.70[Formula: see text] in the mobile state recognition task. Our study offers a strategy for dealing with multivariate time series classification issues and paves the way to developing efficient neuromorphic computing.","PeriodicalId":13688,"journal":{"name":"Int. J. Bifurc. Chaos","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79802027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Global Hopf Bifurcation of State-Dependent Delay Differential Equations 状态相关时滞微分方程的全局Hopf分岔

Int. J. Bifurc. Chaos Pub Date : 2023-05-01 DOI: 10.1142/s0218127423500748

Shangjiang Guo

引用次数: 0