We present adaptive neural control design for a class of perturbed nonlinear MIMO time-varying delay systems in a block-triangular form. Based on a neural controller, it is obtained by constructing a quadratic-type Lyapunov-Krasovskii functional, which efficiently avoids the controller singularity. The proposed control guarantees that all closed-loop signals remain bounded, while the output tracking error dynamics converge to a neighborhood of the desired trajectories. The simulation results demonstrate the effectiveness of the proposed control scheme.
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http://dx.doi.org/10.1155/2013/963986 | DOI Listing |
Alzheimers Dement
December 2024
University of South Carolina, Columbia, SC, USA
Background: While physical activity is found to be associated with a lower risk of dementia in numerous studies, less is known whether this association varies over time. We aim to examine the potential time‐varying associations of physical activity with risk of dementia from midlife to late life.
Method: Participants aged 54 to 64 years of the Health Retirement Study (HRS) in 1996 were included.
Alzheimers Dement
December 2024
Mt. Sinai School of Medicine, New York, NY, USA
Background: Despite women showing greater pathological tau burden than men in the preclinical and mild cognitive impairment (MCI) stages of Alzheimer’s disease (AD), they show a cognitive advantage, particularly in verbal memory, followed by a steeper decline. Thus, the question of sex differences in the clinical manifestation of AD pathology is important, but underexamined. Among preclinical AD and MCI participants, we examined sex differences in the relationship of changes in cerebrospinal fluid (CSF) pTau181/Aβ42 (pTau/Aβ) ratio to changes in verbal memory.
View Article and Find Full Text PDFSensors (Basel)
December 2024
School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.
In network function virtualization, the resource demand of network services changes with network traffic. SFC migration has emerged as an effective technique for preserving the quality of service. However, one important problem that has not been addressed in prior studies is how to manage network load while maintaining service-level agreements for time-varying resource demands.
View Article and Find Full Text PDFPhys Life Rev
December 2024
Community Healthcare Center Dr. Adolf Drolc Maribor, Ulica talcev 9, 2000 Maribor, Slovenia; Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, 2000 Maribor, Slovenia; Complexity Science Hub, Metternichgasse 8, 1080 Vienna, Austria; Department of Physics, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. Electronic address:
Synchrony in neuronal networks is crucial for cognitive functions, motor coordination, and various neurological disorders. While traditional research has focused on pairwise interactions between neurons, recent studies highlight the importance of higher-order interactions involving multiple neurons. Both types of interactions lead to complex synchronous spatiotemporal patterns, including the fascinating phenomenon of chimera states, where synchronized and desynchronized neuronal activity coexist.
View Article and Find Full Text PDFInfect Dis (Lond)
January 2025
Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.
Background: Although recommended isolation periods for Coronavirus disease 2019 (COVID-19) have been shortened as the pandemic has subsided, prolonged Severe Acute Respiratory Syndrome-Coronavirus-2 (SARS-CoV-2) shedding remains common in immunocompromised patients. This study estimated the probability of viral clearance in these patients based on elapsed days and specific risk factors.
Methods: We prospectively enrolled immunocompromised patients with a confirmed COVID-19 diagnosis from January 2022 to May 2023 during the Omicron variant era.
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