The European Physical Journal Special Topics最新文献_第6页

Designing sampled data controller for time-delayed fractional-order neural networks via a new functional approach 通过新函数方法为时延分数阶神经网络设计采样数据控制器

The European Physical Journal Special Topics Pub Date : 2024-08-06 DOI: 10.1140/epjs/s11734-024-01261-9

N. Padmaja

引用次数: 0

Deterministic-like data-driven discovery of stochastic differential equations via the Feynman–Kac formalism 通过费曼-卡克（Feynman-Kac）形式主义，以类似确定性的数据驱动发现随机微分方程

The European Physical Journal Special Topics Pub Date : 2024-08-06 DOI: 10.1140/epjs/s11734-024-01270-8

Chaoxiang Ma, Cheng Huang, Cheng Cheng, Xiuting Li

{"title":"Deterministic-like data-driven discovery of stochastic differential equations via the Feynman–Kac formalism","authors":"Chaoxiang Ma, Cheng Huang, Cheng Cheng, Xiuting Li","doi":"10.1140/epjs/s11734-024-01270-8","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01270-8","url":null,"abstract":"This paper develops a data-driven deterministic identification architecture for discovering stochastic differential equations (SDEs) directly from data. The architecture first generates deterministic data for stochastic processes using the Feynman–Kac formula, and gives a parabolic partial differential equation (PDE) associated with the SDE. Then, a sparse regression model is proposed to discover drift and diffusion terms in SDEs using PDE data-driven techniques, where a large candidate library of potential terms only for the drift and diffusion coefficients in SDEs need be constructed. To simultaneously infer the drift and diffusion terms, we proposed a sequential thresholded reweighted least-squares algorithm to solve the constructed sparse regression model. The main advantage of the proposed method is that on the one hand, theoretical and numerical identification results of PDEs can be used for SDEs, on the score, our SDE identification problem is translated into the parameter estimation problem of PDEs, on the other hand, the proposed algorithm is easily executed and can enhance the sparsity and accuracy. Through several classical SDEs and ordinary differential equations, the effectiveness of the proposed data-driven method is demonstrated, and several comparison experiments with state-of-the-art approaches is provided to illustrate the superiority of the developed algorithm.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940100","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

Exploring tumor-induced immunosuppression dynamics by myeloid-derived suppressor cells: insights via a fractional-order mathematical model 探索髓源性抑制细胞诱导的肿瘤免疫抑制动态：通过分数阶数学模型获得的启示

The European Physical Journal Special Topics Pub Date : 2024-08-06 DOI: 10.1140/epjs/s11734-024-01260-w

B. Krithika, P. Tamilalagan

{"title":"Exploring tumor-induced immunosuppression dynamics by myeloid-derived suppressor cells: insights via a fractional-order mathematical model","authors":"B. Krithika, P. Tamilalagan","doi":"10.1140/epjs/s11734-024-01260-w","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01260-w","url":null,"abstract":"This study investigates the intricate role of myeloid-derived suppressor cells (MDSCs) in inhibiting the immunological responses against malignancies by employing a delayed fractional-order mathematical model. The proposed mathematical model includes tumor cells, dendritic cells, macrophages, cytotoxic T lymphocytes (CTLs), and MDSCs as components of a five-dimensional deterministic system. Further, the model accounts for the duration of the mechanism by which MDSCs perform immunosuppressive activities. One such mechanism involves the release of immunosuppressive cytokines such as interleukin-10 (IL-10), and it is elucidated by incorporation of the time-delay parameter, (tau). Basic properties of the system such as non-negativity and uniqueness of solutions as well as the existence of biologically feasible steady states are explored. The conditions for steady-state stability and existence of Hopf bifurcation concerning the delay parameter ((tau )) are established. We notice that the growth rate of cancer cells determines the stability nature of the tumor-free equilibrium, regardless of the time-delay (tau). While the fractional-order (alpha) does not affect the stability of steady states, however it does influence the transient behavior of the considered system.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"96 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940050","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

An introduction to phase ordering in scalar active matter 标量活性物质相序导论

The European Physical Journal Special Topics Pub Date : 2024-08-05 DOI: 10.1140/epjs/s11734-024-01273-5

Laura Meissner, Julia M. Yeomans

引用次数: 0

Stabilization of T–S fuzzy membership-function dependent H $$_infty $$ -based sampled-data control systems using an improved exponential two-sided looped-functional approach 使用改进的指数双面循环函数法稳定基于 T-S 模糊成员函数依赖 H $$_infty $$ 的采样数据控制系统

The European Physical Journal Special Topics Pub Date : 2024-08-05 DOI: 10.1140/epjs/s11734-024-01262-8

Kumarasamy Palanimuthu, Seong Ryong Lee, Jae Hoon Jeong, Young Hoon Joo

{"title":"Stabilization of T–S fuzzy membership-function dependent H $$_infty $$ -based sampled-data control systems using an improved exponential two-sided looped-functional approach","authors":"Kumarasamy Palanimuthu, Seong Ryong Lee, Jae Hoon Jeong, Young Hoon Joo","doi":"10.1140/epjs/s11734-024-01262-8","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01262-8","url":null,"abstract":"This study concerns the exponential stability and stabilization problem for the Takagi–Sugeno (T–S) fuzzy systems under the membership function dependent (MFD) H(_infty )-based sampled-data control (SDC) using an improved exponential two-sided looped-functional (TSLF) approach. First, an exponential TSLF is introduced to achieve the state information within the intervals (t_{textrm{k}}) to t and t to (t_{textrm{k}+1}), which not only relaxes the monotonic constraint but would also not impose the terms as positive definite. By employing the concept of looped-functional, a new exponential TSLF is introducing the exponents (e^{2alpha (t-t_{textrm{k}})},) (frac{e^{2alpha (t_{textrm{k}+1}-t)}-1}{2alpha }), and (frac{e^{-2alpha (t-t_{textrm{k}})}-1}{2alpha }), thereby enhancing the control performance, design flexibility and also it contains the more actual sampling information of system states. Next, the new exponentially stable lemma is derived from the fuzzy SDC system with an external disturbance. To this end, the time derivatives of exponential TSLF-based Lyapunov–Krasovskii functional, some stabilization criteria exist in formulating linear matrix inequalities to secure the system is exponentially stable under MFD H(_infty ) criterion. Finally, the chaotic permanent magnet synchronous generator-based wind energy system is demonstrated under the practical values with proposed sufficient conditions, and Rossler’s model expresses the advantages and excellence of the proposed techniques.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940051","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

Active disturbance reduction scheme for descriptor semi-Markovian jump systems with nonlinear uncertainties 具有非线性不确定性的描述符半马尔可夫跳跃系统的主动干扰减少方案

The European Physical Journal Special Topics Pub Date : 2024-08-05 DOI: 10.1140/epjs/s11734-024-01275-3

S. Mohanapriya, S. Harshavarthini

引用次数: 0

Practicing aspects of gamma-ray spectroscopy for nuclear astrophysics 核天体物理学伽马射线光谱学的实践方面

The European Physical Journal Special Topics Pub Date : 2024-08-05 DOI: 10.1140/epjs/s11734-024-01278-0

Rajarshi Raut

引用次数: 0

Design of sampled-data controller for T–S fuzzy system with the refined fractional delayed-state and its applications 具有精炼分数延迟状态的 T-S 模糊系统的采样数据控制器设计及其应用

The European Physical Journal Special Topics Pub Date : 2024-08-05 DOI: 10.1140/epjs/s11734-024-01268-2

Ramasamy Subramaniyam, Manivannan Annamalai, Young Hoon Joo

{"title":"Design of sampled-data controller for T–S fuzzy system with the refined fractional delayed-state and its applications","authors":"Ramasamy Subramaniyam, Manivannan Annamalai, Young Hoon Joo","doi":"10.1140/epjs/s11734-024-01268-2","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01268-2","url":null,"abstract":"The paper is concerned with the development of a sampled-data (SD) controller designed for Takagi–Sugeno (T–S) fuzzy systems. A key highlight is the incorporation of a refined fractional delayed-state into this control approach. The primary aim is to establish criteria for system stabilization, thereby ensuring the asymptotic stability of the considered systems. This objective is pursued within the framework of the newly designed control methodology. The core contribution of work explains in the introduction of an innovative Lyapunov–Krasovskii functional (LKF) tailored to T–S fuzzy systems. This novel approach capitalizes on the efficacy of sampling intervals. The LKF design takes advantage of variable attributes tied to the real sampling pattern, effectively reducing the conservatism of the outcomes. Moreover, the paper introduces a sophisticated fractional delayed-state concept, which plays a pivotal role in shaping a modified looped functional-based LKF. The stability criteria are then formulated through the utilization of linear matrix inequalities (LMIs) and integral inequalities. These criteria perform dynamic part in establishing the asymptotic stability of considered systems when subjected to the designed control approach.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"197 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940049","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

The identification for time-varying parameter and noise of tuberculosis with seasonal changes based on data-behavior-driven system 基于数据行为驱动系统的结核病季节性时变参数和噪声识别

The European Physical Journal Special Topics Pub Date : 2024-08-05 DOI: 10.1140/epjs/s11734-024-01274-4

Kexin Wei, Shaojuan Ma

{"title":"The identification for time-varying parameter and noise of tuberculosis with seasonal changes based on data-behavior-driven system","authors":"Kexin Wei, Shaojuan Ma","doi":"10.1140/epjs/s11734-024-01274-4","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01274-4","url":null,"abstract":"Time-varying and seasonal parameter inversion in the mathematical model of infectious diseases and uncertainty quantization based on actual data have great significance for real quantitative transmission process. In this study, the behavior-driven mathematical model of infectious diseases and the data-driven parameter identification method are combined to quantify the transmission law of tuberculosis (TB). To begin with, according to the characteristics of TB transmission, the TS-SID model with time-varying is established. Then, the improved identification algorithm is proposed to track the fluctuation of disease infection rate and mortality rate considering the seasonal influence. Meanwhile, focusing on the influence of noise on the spread of diseases, noise reduction and uncertain quantization are carried out on the data to identify the noise distribution. In addition, predict the denoised sequence and superimpose the noise distribution, which can improve the rationality of prediction. Finally, the numerical comparison shows that seasonal time-varying tracking is good for grasping and predicting the disease evolution.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141940058","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

An arm musculoskeletal control scheme incorporating cerebellar and emotional learning models 结合小脑和情感学习模型的手臂肌肉骨骼控制方案

The European Physical Journal Special Topics Pub Date : 2024-08-02 DOI: 10.1140/epjs/s11734-024-01269-1

Fengjie Wang, Fang Han, Ying Yu, Qinghua Zhu

{"title":"An arm musculoskeletal control scheme incorporating cerebellar and emotional learning models","authors":"Fengjie Wang, Fang Han, Ying Yu, Qinghua Zhu","doi":"10.1140/epjs/s11734-024-01269-1","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01269-1","url":null,"abstract":"The cerebrum and cerebellum play a crucial role in motion control and are crucial to perform a variety of fast, precise movements for humans and animals. Emotions are generated in the cerebral cortex, and activate the amygdala, which promotes the storage of information in various regions of the cerebrum. In this paper, cerebellar learning model, emotional learning model, and spinal cord calculation module are incorporated to complete the control of an arm musculoskeletal system, and the redundancy problem of the musculoskeletal system control is solved through the optimized calculation in the spinal cord module. The arm musculoskeletal system can thus complete the end trajectory execution task successfully. It is shown that compared with the cerebellar motion control scheme, the proposed scheme has the advantages of fast learning convergence, simplified synaptic adaptation of cerebellum and strong anti-disturbance ability. It is also verified that the proposed control scheme exhibits good robustness to random noise. The proposed arm musculoskeletal control scheme operates effectively and provides a theoretical reference for the application of biomimetic musculoskeletal system.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882647","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