IFAC-PapersOnLine最新文献_第5页

Using Benford’s Law for analysis of the electroencephalogram

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.050

Sandra Widmann , Aditi Prasad , Gerhard Schneider , Matthias Kreuzer

{"title":"Using Benford’s Law for analysis of the electroencephalogram","authors":"Sandra Widmann , Aditi Prasad , Gerhard Schneider , Matthias Kreuzer","doi":"10.1016/j.ifacol.2025.03.050","DOIUrl":"10.1016/j.ifacol.2025.03.050","url":null,"abstract":"<div><div>We investigated the first-digit distribution of simulated and real EEG signals recorded during wakefulness and various sleep stages. Furthermore, we examined how variables such as noise or patient age influence the first-digit distribution and affect its conformity with Benford’s Law. Simulated 1/f noise episodes, which serve as proxies for EEG data, were generated with varying spectral exponents to explore how these changes influence the first-digit distribution. Additionally, we analyzed sleep EEG data from an open-source database to compare the first-digit distributions across different sleep stages, particularly focusing on N3 sleep, which shares similarities with EEG patterns observed under general anesthesia.</div><div>Our results demonstrate that the first-digit distribution is influenced by the investigated features, i.e., spectral exponent, vigilance state, and age. Deviations from wakefulness cause deviations from the Benford distribution. Moreover, age-related variations in EEG data may lead to changes in first-digit distributions, potentially offering new insights into how aging affects brain activity. These findings suggest that applying Benford’s Law to EEG analysis could complement existing methods for patient monitoring. The results from our investigation justify the next step of applying this method to anesthesia data.</div></div>","PeriodicalId":37894,"journal":{"name":"IFAC-PapersOnLine","volume":"59 1","pages":"Pages 289-294"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A metapopulation SIHURD model⁎

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.060

Ion Bica , Zhichun Zhai , Rui Hu , Wanhua Su

{"title":"A metapopulation SIHURD model⁎","authors":"Ion Bica , Zhichun Zhai , Rui Hu , Wanhua Su","doi":"10.1016/j.ifacol.2025.03.060","DOIUrl":"10.1016/j.ifacol.2025.03.060","url":null,"abstract":"<div><div>We enhance our SIHURD model published in Bica et-al (2022) and propose a metapopulation infectious disease mathematical monitoring model where individuals move between discrete spatial patches. We divide the environment into a finite number of spatial patches (e.g., adjacent cities), which preserve homogeneity characteristics. We apply the enhanced SIHURD model presented in this article to each spatial patch.</div><div>The novelty of this model lies in introducing parameters that represent individuals’ travel rates between spatial patches, which depend on their disease status. In addition, it assumes that individuals do not change their disease status while travelling between patches.</div><div>Our study uses the reproduction number, R<sub>0k</sub>, for each spatial patch, k = 1, 2, . . . , n, (n > 1) integer, which represents the average number of secondary cases produced by an infected individual in a susceptible population. The system has only a disease-free equilibrium point if R<sub>0k</sub> ≤ 1. In contrast, if R<sub>0k</sub> > 1, the system has an endemic equilibrium point. Reproduction numbers R<sub>0k</sub> are crucial for understanding the spread of infectious diseases and can inform measures to control outbreaks effectively.</div><div>Migration between patches fundamentally alters the behaviour of the endemic equilibrium within a patch, rendering it unstable in the proposed model.</div></div>","PeriodicalId":37894,"journal":{"name":"IFAC-PapersOnLine","volume":"59 1","pages":"Pages 349-354"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced utilization of structural damping of beam-like structures by using state-dependent impulsive moments

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.034

T. Pumhössel, P. Shamiyeh

引用次数: 0

Real-Time Capable Transient H2 Partial Pressure Model for Proton Exchange Membrane Fuel Cell Systems

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.003

Martin Osterhammer , Fengmin Du , Volker Formanski , Marcelo Lobo Heldwein

{"title":"Real-Time Capable Transient H2 Partial Pressure Model for Proton Exchange Membrane Fuel Cell Systems","authors":"Martin Osterhammer , Fengmin Du , Volker Formanski , Marcelo Lobo Heldwein","doi":"10.1016/j.ifacol.2025.03.003","DOIUrl":"10.1016/j.ifacol.2025.03.003","url":null,"abstract":"<div><div>Fuel cell electric vehicles hold a significant promise for reducing the carbon footprint in the automotive sector by leveraging H<sub>2</sub> as a clean fuel source. Maintaining a consistent H<sub>2</sub> supply to the fuel cell system is vital. N<sub>2</sub> crossover can lead to an inert gas built-up on the H<sub>2</sub> supply side, adversely affecting fuel cell performance and durability. Through purging, gases are released, and a N<sub>2</sub> built-up in the H<sub>2</sub> supply system can be prevented, yet this also leads to fuel loss. This fuel loss can be minimized by keeping an optimal N<sub>2</sub> molar fraction. We developed a dynamic model for effectively designing, controlling, and diagnosing fuel cell systems by predicting the N<sub>2</sub> molar fraction in the H<sub>2</sub> supply. This model considers factors such as N<sub>2</sub> distribution throughout the fuel cell stack, N<sub>2</sub> crossover, and the purge process. The model is simplified to a differential equation of first order and solved using the explicit Euler method at a typical automotive time step of 0.01s. The proposed model is validated by a H<sub>2</sub> measurement in a fuel cell system with passive recirculation.</div></div>","PeriodicalId":37894,"journal":{"name":"IFAC-PapersOnLine","volume":"59 1","pages":"Pages 7-12"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploiting Asymmetries in Diffusively Coupled Oscillators to Enable Frequency Tunability in Neuromorphic Devices1

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.038

Hermann Folke Johann Rolf , Thomas Meurer

{"title":"Exploiting Asymmetries in Diffusively Coupled Oscillators to Enable Frequency Tunability in Neuromorphic Devices1","authors":"Hermann Folke Johann Rolf , Thomas Meurer","doi":"10.1016/j.ifacol.2025.03.038","DOIUrl":"10.1016/j.ifacol.2025.03.038","url":null,"abstract":"<div><div>By exploiting controllable asymmetries, consensus in networks can be adjusted. In case of coupled oscillators, the characteristic frequencies of the network can be controlled. This property is called frequency tunability and it is, e.g., induced by changing the asymmetry between the damping of the oscillators or the coupling between the oscillators. Subsequently, the frequency tunability of two diffusively coupled Andronov-Hopf oscillators is investigated by analyzing the emergence of Andronov-Hopf bifurcations. This is done by investigating the local dynamics of the corresponding system. It turns out that the number of critical points of the Andronov-Hopf bifurcation is determined by analyzing a polynomial whose degree changes based on the choice of the bifurcation parameter. Thus, this polynomial is analyzed in terms of two different bifurcation parameters: (i) symmetric damping and (ii) symmetric coupling. In case of (i), the system has two critical points, which correspond to Andronov-Hopf bifurcations. In contrast to this, for (ii) the number of critical points varies between one and three depending on the asymmetric damping.</div></div>","PeriodicalId":37894,"journal":{"name":"IFAC-PapersOnLine","volume":"59 1","pages":"Pages 217-222"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Validator’s Opinion Dynamic in a Practical Byzantine Fault Tolerant Network⁎

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.039

Rachid Guedjali , Jean-Philippe Georges , Sylvain Kubler

引用次数: 0

Digital Twin for Autonomous Decision-Making in Gas Lift Operations: Improving Reliability and Adaptability

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.011

Carine Menezes Rebello , Johannes Jäschke , Idelfonso B.R. Nogueira

{"title":"Digital Twin for Autonomous Decision-Making in Gas Lift Operations: Improving Reliability and Adaptability","authors":"Carine Menezes Rebello , Johannes Jäschke , Idelfonso B.R. Nogueira","doi":"10.1016/j.ifacol.2025.03.011","DOIUrl":"10.1016/j.ifacol.2025.03.011","url":null,"abstract":"<div><div>A virtual representation of a complete cyber-physical system introduces several opportunities, such as enabling real-time monitoring of physical systems and ongoing learning to deliver accurate and dependable information. This approach is often referred to as the creation of a digital twin (DT). Nevertheless, challenges emerge, particularly with the computational requirements of implementing AI-driven models in real-time data exchange contexts, as is common with DTs. This research presents a DT framework tailored for optimal and autonomous decision-making within a gas-lift process, with a focus on increasing the adaptability of the DT system. The proposed solution integrates Bayesian inference, Monte Carlo (MC) simulations, transfer learning, and online learning alongside techniques for dimensionality reduction and cognitive modelling. These approaches contribute to the development of a reliable and efficient DT. The framework aims to deliver a system that can adapt to dynamic environments, account for prediction uncertainties, and improve decision-making processes in complex, real-world applications.</div></div>","PeriodicalId":37894,"journal":{"name":"IFAC-PapersOnLine","volume":"59 1","pages":"Pages 55-60"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A New Numerical Approach to Transfer Functions of LTI-PDEs⁎

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.018

Jan M. Schaßberger , Veit Hagenmeyer , Lutz Gröll

引用次数: 0

A Mathematical Model for the Intracellular Accumulation of two Energy Reserve Carbohydrates in S. cerevisiae Cultures 麦角菌培养物中两种能量储备碳水化合物细胞内积累的数学模型

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.070

Antoine Huet , Mihaela Sbarciog , Philippe Bogaerts

引用次数: 0

Fiber Activation in Bipolar Deep Brain Stimulation: A Patient Case Study⁎

IFAC-PapersOnLine Pub Date : 2025-01-01 DOI: 10.1016/j.ifacol.2025.03.062

Anna F. Frigge , Elena Jiltsova , Fredrik Olsson , Dag Nyholm , Alexander Medvedev

{"title":"Fiber Activation in Bipolar Deep Brain Stimulation: A Patient Case Study⁎","authors":"Anna F. Frigge , Elena Jiltsova , Fredrik Olsson , Dag Nyholm , Alexander Medvedev","doi":"10.1016/j.ifacol.2025.03.062","DOIUrl":"10.1016/j.ifacol.2025.03.062","url":null,"abstract":"<div><div>Deep brain stimulation (DBS) is a therapy widely used for treating the symptoms of neurological disorders. Electrical pulses are chronically delivered in DBS to a disease-specific brain target via a surgically implanted electrode. The stimulating contact configuration, stimulation polarity, as well as amplitude, frequency, and pulse width of the DBS pulse sequence are utilized to optimize the therapeutic effect. In this paper, the utility of therapy individualization by means of patient-specific mathematical modeling is investigated with respect to a specific case of a patient diagnosed with Essential tremor (ET). Two computational models are compared in their ability to elucidate the impact of DBS stimulation on the Dentato-Rubro-Thalamic tract (DRTT): (i) a conventional model of volume of tissue activated (VTA) and (ii) a well-established, open-source simulation (OSS) neural fiber activation modeling framework known as OSS-DBS. The simulation results are compared with tremor measured in the patient under different DBS settings using a smartphone application. The findings of the study highlight that temporally static VTA models do not adequately describe the differences in the outcomes of bipolar stimulation settings with switched polarity, whereas neural fiber activation models hold potential in this regard. However, it is noted that neither of the investigated models fully accounts for the measured symptom pattern, particularly regarding a bilateral effect produced by unilateral stimulation.</div></div>","PeriodicalId":37894,"journal":{"name":"IFAC-PapersOnLine","volume":"59 1","pages":"Pages 361-366"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0