Ruiyuan Chen
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View article: Cortical morphological alterations and structural covariant network topology changes in children with acute lymphoblastic leukemia
Cortical morphological alterations and structural covariant network topology changes in children with acute lymphoblastic leukemia Open
On days 46-52 of chemotherapy, changes in the morphology of the cerebral cortex, and changes in the Deg, Bet, and hub values in the SCN were already present in children with ALL. The bilateral frontal lobe may be the most susceptible brain…
View article: Hilbert spaces admit no finitary discrete imaginaries
Hilbert spaces admit no finitary discrete imaginaries Open
We prove that every functor from the category of Hilbert spaces and linear isometric embeddings to the category of sets which preserves directed colimits must be essentially constant on all infinite-dimensional spaces. In other words, ever…
View article: Association between age-related cardiovascular disease and systemic lupus erythematosus: a Mendelian randomization analysis
Association between age-related cardiovascular disease and systemic lupus erythematosus: a Mendelian randomization analysis Open
JOURNAL/agad/04.03/02274129-202512000-00002/figure1/v/2025-10-03T110810Z/r/image-tiff Current research has demonstrated that individuals with systemic lupus erythematosus face a markedly greater risk of cardiovascular disease. However, the…
View article: Componentwise Polish groupoids and equivalence relations
Componentwise Polish groupoids and equivalence relations Open
We study Borel equivalence relations equipped with a uniformly Borel family of Polish topologies on each equivalence class, and more generally, standard Borel groupoids equipped with such a family of topologies on each connected component.…
View article: ÉTALE STRUCTURES AND THE JOYAL–TIERNEY REPRESENTATION THEOREM IN COUNTABLE MODEL THEORY
ÉTALE STRUCTURES AND THE JOYAL–TIERNEY REPRESENTATION THEOREM IN COUNTABLE MODEL THEORY Open
An étale structure over a topological space X is a continuous family of structures (in some first-order language) indexed over X . We give an exposition of this fundamental concept from sheaf theory and its relevance to countable model the…
View article: A novel deep learning system for automated diagnosis and grading of lumbar spinal stenosis based on spine MRI: model development and validation
A novel deep learning system for automated diagnosis and grading of lumbar spinal stenosis based on spine MRI: model development and validation Open
OBJECTIVE The study aimed to develop a single-stage deep learning (DL) screening system for automated binary and multiclass grading of lumbar central stenosis (LCS), lateral recess stenosis (LRS), and lumbar foraminal stenosis (LFS). METHO…
View article: Optimal Syntactic Definitions of Back-and-Forth Types
Optimal Syntactic Definitions of Back-and-Forth Types Open
The back-and-forth relations $M\leq_αN$ are central to computable structure theory and countable model theory. It is well-known that the relation $\{(M,N) : M \leq_αN\}$ is (lightface) $Π^0_{2α}$. We show that this is optimal as the set is…
View article: MedFuseNet: fusing local and global deep feature representations with hybrid attention mechanisms for medical image segmentation
MedFuseNet: fusing local and global deep feature representations with hybrid attention mechanisms for medical image segmentation Open
Medical image segmentation plays a crucial role in addressing emerging healthcare challenges. Although several impressive deep learning architectures based on convolutional neural networks (CNNs) and Transformers have recently demonstrated…
View article: Automated diagnosis and grading of lumbar intervertebral disc degeneration based on a modified YOLO framework
Automated diagnosis and grading of lumbar intervertebral disc degeneration based on a modified YOLO framework Open
Background The high prevalence of low back pain has led to an increasing demand for the analysis of lumbar magnetic resonance (MR) images. This study aimed to develop and evaluate a deep-learning-assisted automated system for diagnosing an…
View article: Tree-like graphings, wallings, and median graphings of equivalence relations
Tree-like graphings, wallings, and median graphings of equivalence relations Open
We prove several results showing that every locally finite Borel graph whose large-scale geometry is ‘tree-like’ induces a treeable equivalence relation. In particular, our hypotheses hold if each component of the original graph either has…
View article: Deep learning-based multimodal image analysis predicts bone cement leakage during percutaneous kyphoplasty: protocol for model development, and validation by prospective and external datasets
Deep learning-based multimodal image analysis predicts bone cement leakage during percutaneous kyphoplasty: protocol for model development, and validation by prospective and external datasets Open
Background Bone cement leakage (BCL) is one of the most prevalent complications of percutaneous kyphoplasty (PKP) for treating osteoporotic vertebral compression fracture (OVCF), which may result in severe secondary complications and poor …
View article: Structurable equivalence relations and $\mathcal{L}_{ω_1ω}$ interpretations
Structurable equivalence relations and $\mathcal{L}_{ω_1ω}$ interpretations Open
We show that the category of countable Borel equivalence relations (CBERs) is dually equivalent to the category of countable $\mathcal{L}_{ω_1ω}$ theories which admit a one-sorted interpretation of a particular theory we call $\mathcal{T}_…
View article: Clones of Borel Boolean Functions
Clones of Borel Boolean Functions Open
We study the lattice of all Borel clones on $2 = \{0,1\}$: classes of Borel functions $f : 2^n \to 2$, $n \le ω$, which are closed under composition and include all projections. This is a natural extension to countable arities of Post's 19…
View article: Artificial intelligence automatic measurement technology of lumbosacral radiographic parameters
Artificial intelligence automatic measurement technology of lumbosacral radiographic parameters Open
Background Currently, manual measurement of lumbosacral radiological parameters is time-consuming and laborious, and inevitably produces considerable variability. This study aimed to develop and evaluate a deep learning-based model for aut…
View article: National legislatures and corporate transparency
National legislatures and corporate transparency Open
The purpose of this study is to posit and test whether the presence and structure of national legislatures can account for the varying degree of corporate transparency displayed by firms operating in emerging economies. We conducted tests …
View article: Development of a software system for surgical robots based on multimodal image fusion: study protocol
Development of a software system for surgical robots based on multimodal image fusion: study protocol Open
Background Surgical robots are gaining increasing popularity because of their capability to improve the precision of pedicle screw placement. However, current surgical robots rely on unimodal computed tomography (CT) images as baseline ima…
View article: Worldwide board reforms and financial reporting quality
Worldwide board reforms and financial reporting quality Open
This study assesses whether and how corporate board reforms affect firms' financial reporting practices. Using a sample of 40 countries and employing a difference-in-differences design, we find that corporate board reforms reduce firms' re…
View article: Structural, point-free, non-Hausdorff topological realization of Borel groupoid actions
Structural, point-free, non-Hausdorff topological realization of Borel groupoid actions Open
We extend the Becker–Kechris topological realization and change-of-topology theorems for Polish group actions in several directions. For Polish group actions, we prove a single result that implies the original Becker–Kechris theorems, as w…
View article: Retrospective computed tomography assessment of chemotherapy-related pneumonia with severity screening in pediatric acute lymphoblastic leukemia by radiological imaging
Retrospective computed tomography assessment of chemotherapy-related pneumonia with severity screening in pediatric acute lymphoblastic leukemia by radiological imaging Open
The chest CT images of children with chemotherapy-related pneumonia displayed clinically related baseline RSI and a peak RSI of >4.5 of 36 predicted severe phenotypes.
View article: Tree-like graphings, wallings, and median graphings of equivalence relations
Tree-like graphings, wallings, and median graphings of equivalence relations Open
We prove several results showing that every locally finite Borel graph whose large-scale geometry is "tree-like" induces a treeable equivalence relation. In particular, our hypotheses hold if each component of the original graph either has…
View article: A Gelfand duality for continuous lattices
A Gelfand duality for continuous lattices Open
We prove that the category of continuous lattices and meet- and directed join-preserving maps is dually equivalent, via the hom functor to $[0,1]$, to the category of complete Archimedean meet-semilattices equipped with a finite meet-prese…