885 research outputs found
Existence of -attractor and estimate of their attractive velocity for infinite-dimensional dynamical systems
This paper is devoted to the quantitative study of the attractive velocity of
generalized attractors for infinite-dimensional dynamical systems. We introduce
the notion of~-attractor whose attractive speed is characterized by a
general non-negative decay function~, and prove that~-decay
with respect to noncompactness measure is a sufficient condition for a
dissipitive system to have a~-attractor. Furthermore, several criteria
for~-decay with respect to noncompactness measure are provided.
Finally, as an application, we establish the existence of a generalized
exponential attractor and the specific estimate of its attractive velocity for
a semilinear wave equation with a critical nonlinearity.Comment: arXiv admin note: substantial text overlap with arXiv:2108.0741
On the spectrum of operators concerned with the reduced singular Cauchy integral
We investigate spectrums of the reduced singular Cauchy operator and its real and imaginary components
Defect-related luminescent nanostructured hydroxyapatite promotes mineralization through both intracellular and extracellular pathways
Hydroxyapatite (HAP) is a widely used biomaterial for bone tissue substitution due to its chemical similarity with the natural bone. Defect-related luminescent HAP materials have the same chemical composition as normal HAP and excellent biocompatibility. However, only few works have focused on the defect-related luminescent HAP materials on bone regeneration. In this work, we systematically investigated the bone regeneration pathway induced by nanostructured particles using defect-related luminescent hydroxyapatite (S2) materials. We monitored the subcellular distribution and location of S2 during osteoblast differentiation with the property of defect-related luminescence. Nano-scale S2 could be internalized by osteoblasts (OBs) via caveolae-mediated endocytosis and macropinocytosis. S2 incorporated into the lysosomes dissolved and released calcium ions for the formation of mineralized nodules. Extracellular S2 also promoted bone regeneration as a nucleation site. Taken together, the physical properties of hydroxyapatite control the bone regeneration pathway in osteoblasts
Information Bottleneck-Inspired Type Based Multiple Access for Remote Estimation in IoT Systems
Type-based multiple access (TBMA) is a semantics-aware multiple access
protocol for remote inference. In TBMA, codewords are reused across
transmitting sensors, with each codeword being assigned to a different
observation value. Existing TBMA protocols are based on fixed shared codebooks
and on conventional maximum-likelihood or Bayesian decoders, which require
knowledge of the distributions of observations and channels. In this letter, we
propose a novel design principle for TBMA based on the information bottleneck
(IB). In the proposed IB-TBMA protocol, the shared codebook is jointly
optimized with a decoder based on artificial neural networks (ANNs), so as to
adapt to source, observations, and channel statistics based on data only. We
also introduce the Compressed IB-TBMA (CIB-TBMA) protocol, which improves
IB-TBMA by enabling a reduction in the number of codewords via an IB-inspired
clustering phase. Numerical results demonstrate the importance of a joint
design of codebook and neural decoder, and validate the benefits of codebook
compression.Comment: 5 pages, 3 figures, accepted by IEEE Signal Processing Letters (SPL
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