28 hasil untuk "Oh-In Kwon"
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Artikel Jurnal
Newton Method to Recover the Phase Accumulated during MRI Data Acquisition
…an object and measures the induced magnetic flux density, which appears in the phase part of the acquired MR image data. To maximize signal intensity, the injected current nonlinear encoding (ICNE) method extends the duration of the current injection until the end of the MR data reading. It…
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Artikel Jurnal
Apparent isotropic electrical property for electrical brain stimulation (EBS) using magnetic resonance diffusion weighted imaging (MR-DWI)
Electrical brain stimulation (EBS) is an invasive electrotherapy and technique used in brain neurological disorders through direct or indirect stimulation using a small electric current. EBS has relied on computational modeling to achieve optimal stimulation effects and investigate the internal…
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Artikel Jurnal
Structural evolution of intra-Asia container shipping networks: A comparative network analysis of 2021Q4 and 2025Q4
…and targeted robustness simulations. Although the network expanded in scale—from 124 to 160 ports and from 425 to 499 directional links—density declined and the number of communities rose from eight to ten, indicating greater segmentation rather than deeper integration. A Jaccard similarity…
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Artikel Jurnal
Reconstruction of intra- and extra-neurite conductivity tensors via conductivity at Larmor frequency and DWI data patterns
…at Larmor frequency by measuring the B1 transceive phase data. In biological tissues, electrical conductivity is influenced by ion concentrations and mobility. To visualize the anisotropic conductivity tensor of biological tissues, we use the Einstein–Smoluchowski equation, which links the…
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Artikel Jurnal
High frequency conductivity decomposition by solving physically constraint underdetermined inverse problem in human brain
…conductivity (HFC) value is highly complex and heterogeneous in a macroscopic imaging voxel. Using high and low b-value diffusion weighted imaging (DWI) data, the multi-compartment spherical mean technique (MC-SMT) characterizes the water molecule movement within and between intra- and…
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Artikel Jurnal
Decomposition of high-frequency electrical conductivity into extracellular and intracellular compartments based on two-compartment model using low-to-high multi-b diffusion MRI
…reconstructed conductivity of extracellular medium and the conductivity in the intra-neurite and intra-cell body. The phantom and human experiments verify that the proposed method can recover the extracellular electrical properties from the high-frequency conductivity using a routine protocol…
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Artikel Jurnal
Histogram-Derived MREPT connectome: A distribution-Aware framework for brain network analysis
…distance. Group-level comparison further revealed network disruption in Alzheimers disease, characterized by reduced connectivity strength and integration together with stronger modular segregation. Regional alterations concentrated in temporal, fusiform, and inferior parietal cortices, accompanied…
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Artikel Jurnal
Gadolinium based contrast agent induced electrical conductivity heterogeneity analysis in the brain of Alzheimer’s disease
…tissues at the Larmor frequency using the $$B_1$$ field phase signal. In this paper, we investigate the effect of GBCA on brain conductivity. To compare the differences of reconstructed noisy conductivity maps before and after the GBCA injection, we propose a method to remove the background…
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Artikel Jurnal
Effects of Oxidative and Alkaline Post-treatments on Removal of Trivalent Iron and Hexavalent Chromium Using Peanut Shell Biochars
Objectives:The main goal of this study was to compare the removal efficiency of trivalent iron and hexavalent chromium by peanut shell biochars (i.e., PB), post-treated peanut shell biochars using KMnO4 (i.e., PB-Ox), and secondary post-treated peanut shell biochars using KOH (i.e., PB-Ox-A)…
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Artikel Jurnal Teks lengkap
Anisotropic conductivity tensor imaging for transcranial direct current stimulation (tDCS) using magnetic resonance diffusion tensor imaging (MR-DTI)
…ion-concentration, and electric field using only the tDCS current in-vivo. By measuring the apparent diffusion coefficient (ADC) and the magnetic flux density induced by the tDCS, we propose a method to visualize the electrical properties. We reconstruct the scale parameter, which connects the…
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Artikel Jurnal Teks lengkap
High-frequency conductivity at Larmor-frequency in human brain using moving local window multilayer perceptron neural network
…design a deep learning model to visualize the high-frequency conductivity in the brain, directly derived from measured magnetic flux density. The designed moving local window multi-layer perceptron (MLW-MLP) neural network by sliding local window consisting of neighboring voxels around each voxel…
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Artikel Jurnal Teks lengkap
Magnetic-resonance-based measurement of electromagnetic fields and conductivity in vivo using single current administration—A machine learning approach
…patterns for unique reconstruction of conductivity characteristics. In this paper, we demonstrate an algorithm that can be used to reconstruct the position dependent scale factor relating conductivity and diffusion tensors, using flux density data measured from only one current injection. We…
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Artikel Jurnal Teks lengkap
Extracellular electrical conductivity property imaging by decomposition of high-frequency conductivity at Larmor-frequency using multi- b -value diffusion-weighted imaging
…that simultaneously reflects the intracellular and extracellular effects. In biological tissues, the electrical conductivity can be described as the concentration and mobility of charge carriers. For the water molecule diffusivity, diffusion weighted imaging (DWI) measures the random Brownian…
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Low-frequency dominant electrical conductivity imaging of in vivo human brain using high-frequency conductivity at Larmor-frequency and spherical mean diffusivity without external injection current
…recovered using the estimated diffusivity parameters and volume fraction in each compartment. We propose a method to reconstruct the low-frequency dominant conductivity tensor by taking into consideration the extracted extracellular diffusion tensor map and the reconstructed electrical parameters…
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In vivo mapping of current density distribution in brain tissues during deep brain stimulation (DBS)
New methods for in vivo mapping of brain responses during deep brain stimulation (DBS) are indispensable to secure clinical applications. Assessment of current density distribution, induced by internally injected currents, may provide an alternative method for understanding the therapeutic effects…
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Artikel Jurnal
Enhanced magnetic flux density mapping using coherent steady state equilibrium signal in MREIT
…electrical property (current density and/or conductivity distribution) in a three-dimensional imaging object. For practical implementations of MREIT technique, it is critical to reduce injection of current pulse within safety requirements. With the goal of minimizing the noise level in measured Bz…