Koji Okamoto
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View article: Evaluation of an AI-Driven Framework for Nuclear Thermal-Hydraulic Modeling and Simulation
Evaluation of an AI-Driven Framework for Nuclear Thermal-Hydraulic Modeling and Simulation Open
This is my doctoral dissertation, completed at the University of Tokyo under the guidance of Professor Shuichiro Miwa. I hope it can be of help to you. Let’s keep growing and learning together — and leave our own small, shimmering mark on …
View article: Using high speed visualization to identify variations in the formation and distribution of plasmonic microbubbles
Using high speed visualization to identify variations in the formation and distribution of plasmonic microbubbles Open
Plasmonic heating of gold nanoparticles (GNPs) using pulsed lasers (PLs) enables microbubble generation for imaging, diagnostics, and microfluidics. However, aggregation and photomodification cause inconsistencies (variations) in microbubb…
View article: Data Release: Measurement of neutron production in atmospheric neutrino interactions at Super-Kamiokande
Data Release: Measurement of neutron production in atmospheric neutrino interactions at Super-Kamiokande Open
This data release accompanies the article ["Measurement of neutron production in atmospheric neutrino interactions at Super-Kamiokande"](https://arxiv.org/abs/2505.04409). The data provided here includes observed average neutron multiplici…
View article: Review of Micro-Engines Utilizing Unsteady Wave Compression
Review of Micro-Engines Utilizing Unsteady Wave Compression Open
Compression via pressure waves is an effective but specific way of compressing gases. This paper presents a broad overview of work related to the use of unsteady processes in the construction of micro-engines. The main advantages of wave r…
View article: Multi-Microseconds Microbubbles Induced by Nanoseconds Pulsed-Laser Heating of Gold Nano-Particles
Multi-Microseconds Microbubbles Induced by Nanoseconds Pulsed-Laser Heating of Gold Nano-Particles Open
This study examines the effect of gold-nanoparticles (GNPs) aggregation on the formation of multimicrosecond water-vapor (WV) microbubbles (MBs) generated by nanosecond pulsed-laser heating of GNPs in water. The MBs' dynamics reveal a "dua…
View article: Re-examining the input-parameters and AI strategies for Critical Heat Flux prediction
Re-examining the input-parameters and AI strategies for Critical Heat Flux prediction Open
View article: A novel fully explicit GPU-accelerated discrete element method coupled with moving particle hydrodynamics (DEM-MPH) for simulating the underwater particle sedimentation behavior
A novel fully explicit GPU-accelerated discrete element method coupled with moving particle hydrodynamics (DEM-MPH) for simulating the underwater particle sedimentation behavior Open
View article: Fluid-Multi Rigid Body Simulation with Phase Change Based on Implicit-Moving Particle Hydrodynamics-Passively Moving Solid (Mph-Pms)
Fluid-Multi Rigid Body Simulation with Phase Change Based on Implicit-Moving Particle Hydrodynamics-Passively Moving Solid (Mph-Pms) Open
View article: Prevention of liver metastasis via the pharmacological suppression of AMIGO2 expression in tumor cells
Prevention of liver metastasis via the pharmacological suppression of AMIGO2 expression in tumor cells Open
View article: An Innovative Fuel Design for HTGRs: Evaluating a 10-Hour High-Temperature Oxidation of the SiC Fuel Matrix During Air Ingress Accident Conditions
An Innovative Fuel Design for HTGRs: Evaluating a 10-Hour High-Temperature Oxidation of the SiC Fuel Matrix During Air Ingress Accident Conditions Open
Preventing severe corrosion incidents caused by air ingress accidents in high-temperature gas-cooled reactors (HTGRs) while improving heat removal efficiency from the core is of paramount importance. To enhance both safety and efficiency, …
View article: A Restriction Boundary-Based Coronal Plane Alignment of the Knee (CPAK) Classification for Restricted Kinematic Alignment Total Knee Arthroplasty
A Restriction Boundary-Based Coronal Plane Alignment of the Knee (CPAK) Classification for Restricted Kinematic Alignment Total Knee Arthroplasty Open
Background Coronal plane alignment of the knee (CPAK) classification was proposed as a means of understanding the knee phenotype in leg alignment and joint line obliquity (JLO). However, when it is adapted to restricted kinematic alignment…
View article: Search for proton decay via $p\rightarrow{e^+η}$ and $p\rightarrow{μ^+η}$ with a 0.37 Mton-year exposure of Super-Kamiokande
Search for proton decay via $p\rightarrow{e^+η}$ and $p\rightarrow{μ^+η}$ with a 0.37 Mton-year exposure of Super-Kamiokande Open
A search for proton decay into $e^+/μ^+$ and a $η$ meson has been performed using data from a 0.373 Mton$\cdot$year exposure (6050.3 live days) of Super-Kamiokande. Compared to previous searches this work introduces an improved model of th…
View article: Transient behaviour and heat transfer characteristics in debris beds: Simulation and analysis of the LIVEJ2 experiment
Transient behaviour and heat transfer characteristics in debris beds: Simulation and analysis of the LIVEJ2 experiment Open
View article: Assessment of the state-of-the-art AI methods for critical heat flux prediction
Assessment of the state-of-the-art AI methods for critical heat flux prediction Open
Critical Heat Flux (CHF) plays a pivotal role in ensuring reliability and safety within boiling two-phase flow systems. Despite the development of numerous CHF prediction tools using conventional empirical correlations, machine learning, a…
View article: Analyses of chemosensitivity using patient-derived ovarian cancer spheroids
Analyses of chemosensitivity using patient-derived ovarian cancer spheroids Open
View article: Investigation of jet induced by direct contact condensation using PIV
Investigation of jet induced by direct contact condensation using PIV Open
Steam Direct Contact Condensation (DCC) is an effective way to condense steam in a pool of water. This method of condensation is widely employed in the containment of nuclear power plants. One of the limitations of DCC is the generation of…
View article: DEVELOPMENT OF LARGE SCALE HIGHLY VISCOUS FLUID-STRUCTURE INTERACTION CALCULATION METHOD FOR CLARIFYING SEDIMENTATION BEHAVIOR OF FUEL DEBRIS IN UNIT 3
DEVELOPMENT OF LARGE SCALE HIGHLY VISCOUS FLUID-STRUCTURE INTERACTION CALCULATION METHOD FOR CLARIFYING SEDIMENTATION BEHAVIOR OF FUEL DEBRIS IN UNIT 3 Open
View article: Piv Investigation of Jet Mixing Induced by Direct Contact Condensation
Piv Investigation of Jet Mixing Induced by Direct Contact Condensation Open
View article: A Novel Fully Explicit Gpu-Accelerated Discrete Element Method Coupled with Moving Particle Hydrodynamics (Dem-Mph) for Simulating the Underwater Particle Sedimentation Behavior
A Novel Fully Explicit Gpu-Accelerated Discrete Element Method Coupled with Moving Particle Hydrodynamics (Dem-Mph) for Simulating the Underwater Particle Sedimentation Behavior Open
View article: Development of the Ai-Assisted Thermal Hydraulic Analysis Method for Condensing Bubbles in Vertical Subcooled Flow Boiling
Development of the Ai-Assisted Thermal Hydraulic Analysis Method for Condensing Bubbles in Vertical Subcooled Flow Boiling Open
View article: Bf-Gan: Development of an Ai-Driven Bubbly Flow Image Generation Model Using Generative Adversarial Networks
Bf-Gan: Development of an Ai-Driven Bubbly Flow Image Generation Model Using Generative Adversarial Networks Open
View article: Determination of Spearman's Rank Correlation for Melt Spreading-Solidification Dynamics Through the Combination of Integrated Experiments and Monte Carlo Method
Determination of Spearman's Rank Correlation for Melt Spreading-Solidification Dynamics Through the Combination of Integrated Experiments and Monte Carlo Method Open
View article: Development of the Ai-Assisted Thermal Hydraulic Analysis Method for Condensing Bubbles in Vertical Subcooled Flow Boiling
Development of the Ai-Assisted Thermal Hydraulic Analysis Method for Condensing Bubbles in Vertical Subcooled Flow Boiling Open
View article: INVESTIGATING THE SIZE DISTRIBUTION EVOLUTION AND THE SURFACE DEPOSITION OF A SIMULANT DUST WITHIN THE FRAMEWORK OF FUEL DEBRIS RETRIEVAL
INVESTIGATING THE SIZE DISTRIBUTION EVOLUTION AND THE SURFACE DEPOSITION OF A SIMULANT DUST WITHIN THE FRAMEWORK OF FUEL DEBRIS RETRIEVAL Open
View article: Investigation and Development of Cutting-Edge Deep Learning Models for Prediction of Critical Heat Flux
Investigation and Development of Cutting-Edge Deep Learning Models for Prediction of Critical Heat Flux Open
View article: Cfd Study of Surface Velocity Developed in a Single Bubble Rising in Still Water
Cfd Study of Surface Velocity Developed in a Single Bubble Rising in Still Water Open
View article: Advancing fluid dynamics simulations: A comprehensive approach to optimizing physics-informed neural networks
Advancing fluid dynamics simulations: A comprehensive approach to optimizing physics-informed neural networks Open
Flow modeling based on physics-informed neural networks (PINNs) is emerging as a potential artificial intelligence (AI) technique for solving fluid dynamics problems. However, conventional PINNs encounter inherent limitations when simulati…
View article: Kinetic modeling of IG-110 oxidation in inert atmosphere with low oxygen concentration for innovative high-temperature gas-cooled reactor applications
Kinetic modeling of IG-110 oxidation in inert atmosphere with low oxygen concentration for innovative high-temperature gas-cooled reactor applications Open
The oxidation behavior of IG-110, a graphite core component, was investigated at temperatures ranging from 400 to 1000°C in a 10 ppm Ar/O2 flow to simulate the oxidation process between the graphite core component and helium coolant with l…
View article: Public Health Centers' Training Session Programs to Develop Programs on Infection Control Practices for Multidrug-Resistant Organisms in Hospitals in Kawaguchi City, Japan
Public Health Centers' Training Session Programs to Develop Programs on Infection Control Practices for Multidrug-Resistant Organisms in Hospitals in Kawaguchi City, Japan Open
Introduction The Kawaguchi City Public Health Center (PHC) conducted training sessions focusing on infection control practices on multidrug-resistant organisms (MDROs) for 19 hospitals and eight affiliated clinics (AFs) with beds in June 2…
View article: Formulation and demonstrations of three-dimensional background-oriented schlieren using a mirror for near-wall density measurements
Formulation and demonstrations of three-dimensional background-oriented schlieren using a mirror for near-wall density measurements Open
Three-dimensional background-oriented schlieren (3D-BOS) is an effective method for reconstructing 3D density fields from optically measured data, but it has limitations in measuring near-wall regions, where most of the light paths are blo…