A5076227300- Optimization and Packing Problems
- Reliability and Maintenance Optimization
- 2D Materials and Applications
- Advanced Optimization Algorithms Research
- Physics of Superconductivity and Magnetism
- Risk and Safety Analysis
- Magnetic properties of thin films
- Iron-based superconductors research
- Probabilistic and Robust Engineering Design
- Optimization and Mathematical Programming
- Combustion and Detonation Processes
- Remote Sensing and LiDAR Applications
- Forest ecology and management
- Advanced Manufacturing and Logistics Optimization
- Optimization and Search Problems
- Cancer Diagnosis and Treatment
- Scheduling and Optimization Algorithms
- Electronic and Structural Properties of Oxides
- Forest Management and Policy
- Vehicle Routing Optimization Methods
- Innovations in Concrete and Construction Materials
- Kidney Stones and Urolithiasis Treatments
- Graphene research and applications
- Advanced Data Storage Technologies
- Ureteral procedures and complications
The University of Tokyo
2011-2025
Wakari Hospital
2024
Hokuriku University
2024
Hikone Central Hospital
2024
Toshiba (Japan)
2022-2023
Kansai University
1999-2017
Hokkaido University
2015
Tokyo Institute of Technology
2008
University of Tsukuba
2003-2008
University of Miyazaki
2006
Van der Waals interfaces can be formed by layer stacking without regard to lattice constants or symmetries of individual building blocks. We engineered the symmetry a van interface tungsten selenide and black phosphorus realized in-plane electronic polarization that led emergence spontaneous photovoltaic effect. Spontaneous photocurrent was observed along polar direction absent in perpendicular it. The explained quantum-mechanical shift current reflects geometrical topological nature this...
Bardeen-Cooper-Schrieffer (BCS) superfluidity and Bose-Einstein condensation (BEC) are the two extreme limits of ground state paired fermion systems. We report crossover behavior from BCS limit to BEC realized by varying carrier density in a two-dimensional superconductor, electron-doped zirconium nitride chloride. The phase diagram, established simultaneous measurements resistivity tunneling spectra under ionic gating, demonstrates pseudogap low-doping regime. ratio superconducting...
This paper presents an algorithm (called the N&M algorithm) for solving pure-integer separable nonlinear programming problems with two constraints. The uses surrogate constraints and solves a given problem by effectively generating values of multiplier (i.e., problems) problems. Examples show that is superior to dynamic using Lagrange in terms number iterations narrowness gap.
A method for solving the problem of optimizing both, redundancy (number redundant components) and component reliability in each stage a system under multiple constraints is presented. mixed-integer nonlinear programming formulation surrogate dual are used. The solution not always feasible original problem, that is, 'surrogate gap' exists. Two countermeasures to gaps considered: (1) modifying tighten constraints, with modification being continued until modified becomes (2) decreasing...
When designing a system, there are two methods that can be used to improve the system's reliability without changing nature of system: 1) using more reliable components, and/or 2) providing redundant components within system. The redundancy allocation problem attempts find appropriate mix & redundancies system in order either minimize cost subject minimum level reliability, or maximize maximum and weight. Redundancy problems classified into groups; one allows have with different...
The paper presents a method for obtaining an optimal reliability allocation of n-stage series system. In each stage, redundant comnponents can be added (in parallel, stand-by, or k-out-of-n:G, etc.), more reliable component used in order to improve the system reliability. solution is obtained by repeatedly using candidate at stage that has greatest value `weighted sensitivity function'. balance between objective unction and constraints controlled `balancing coefficient'. overall...
Abstract Two-dimensional (2D) crystals are attracting growing interest in various research fields such as engineering, physics, chemistry, pharmacy, and biology owing to their low dimensionality dramatic change of properties compared the bulk counter parts. Among techniques used manufacture 2D crystals, mechanical exfoliation has been essential practical applications fundamental research. However, mechanically exfoliated on substrates contain relatively thick flakes that must be found...
Abstract Corneal opacities are important causes of blindness, and their major etiology is infectious keratitis. Slit-lamp examinations commonly used to determine the causative pathogen; however, diagnostic accuracy low even for experienced ophthalmologists. To characterize “face” an infected cornea, we have adapted a deep learning architecture facial recognition applied it probability score specific pathogen causing record diverse features mitigate uncertainty, batches scores 4 serial images...
Van der Waals (vdW) heterostructures have attracted great interest because of their rich material combinations.The discovery two-dimensional magnets has provided a new platform for magnetic vdW heterointerfaces; however, research on heterointerfaces been limited to those with ferromagnetic surfaces. Here we report heterointerface using layered intralayer-antiferromagnetic MPSe3 (M=Mn, Fe) and monolayer transition metal dichalcogenides (TMDs). We found an anomalous upshift the excitonic peak...
Abstract The LiDAR‐equipped iPhone (iPhone‐LiDAR) is highly portable for outdoor use and significantly more cost‐effective compared with other devices, such as uncrewed aerial vehicles (UAVs) or ground‐based LiDAR. This method holds practical promise small‐scale forest measurements. In this study, we conducted terrain mapping positioning of newly planted small areas in northern Japan, along tree height measurements, using iPhone‐LiDAR. iPhone‐LiDAR generated accurate 3D models, allowing...
Superconductivity mostly appears in high carrier density systems and sometimes exhibits common phase diagrams which the critical temperature ${T}_{\mathrm{c}}$ continuously develops with density. enhanced lightly doped regime has seldom been reported, although it is an ideal direction towards crossover between Bardeen-Cooper-Schrieffer (BCS) Bose-Einstein condensate (BEC) limits, where behavior of Cooper pairs changes dramatically. Here we report transport properties superconducting gaps...
The paper presents an efficient method for finding the exact optimal solutions of reliability allocation problems that are formulated as integer nonlinear programming problem generalized to handle constraints and nonseparable problems. is based on branch-and-bound developed by considering separation relaxation techniques.
Spin-torque oscillators (STOs) are unique spintronic devices in which spin current induces the precession of magnetization oscillation layer. In this study, we demonstrate coupled out-of-plane between two layers within an STO. The state is observed magnetoresistance spectra as well its degradation due to mixing free depending on bias current. These behaviors analytically described and numerically reproduced based Landau–Lifshitz–Gilbert equation. Since STO fabricated write head a hard disk...
This paper compares three heuristic methods (Nakagawa-Nakashima, Gopal-Aggarwal-Gupta, Sharma-Venkateswaran) for solving reliability optimization problems with nonlinear constraints. Their effectiveness, measured in terms of computation time, optimality rate, and relative error, is evaluated on several sets randomly generated test constraints series systems. A FORTRAN program generating the best known solutions (some them are exact optimal) included.
Microwave-assisted magnetic recording (MAMR) is a promising technique for improving the density of hard disk drives (HDDs). We propose spin-torque oscillator (STO) structure with two field generation layers (FGLs) and spin-injection (SILs) microwave generation. By using macrospin model micromagnetic simulations, we numerically demonstrate low current operation STO. The nearly antiparallel oscillations FGLs, which make suitable distribution MAMR, are stabilized by slight modulation in-plane...
Quantifying tree damage and mortality caused by single-tree selection harvesting is critical to understanding postharvest forest dynamics management. In this study, we quantified the effects of size species distance from residual trees felled skid trails on in mixed coniferous–broadleaved stands Hokkaido, northern Japan. Among 4,961 that studied, 373 (7.5 %) were damaged, 148 these (3.0 died during or immediately after logging. Hierarchical Bayesian modeling showed risk increased with...
Abstract Emergent properties of 2D materials attract considerable interest in condensed matter physics and science due to their distinguished features that are missing bulk counterparts. A mainstream this research field is broaden the scope material expand horizons area, while developing functional interfaces between different another indispensable direction. Here, emergence electrical conduction at interface insulating demonstrated. new class van der Waals heterostructures consisting two...
Artificial intelligence (AI) is a promising new technology that has the potential of diagnosing allergic conjunctival diseases (ACDs). However, its development slowed by absence tailored image database and explainable AI models. Thus, purpose this study was to develop an model can not only diagnose ACDs but also present basis for diagnosis.
Abstract The Bardeen–Cooper–Schrieffer (BCS) condensation and Bose–Einstein (BEC) are the two limiting ground states of paired Fermion systems, crossover between these limits has been a source excitement for both fields high temperature superconductivity cold atom superfluidity. For superconductors, ultra-low doping systems like graphene Li x ZrNCl successfully approached starting from BCS-side. These superconductors offer new opportunities to clarify nature charged-particles transport...
Abstract A generalized optimization system with a discrete decision space, is described, and on an problem defined which associated the system. new solution method, called modular approach (MA), presented to solve problem. This method extends Morin‐Marsten hybrid idea troublesome problems of dynamic programming. The present also extension branch‐and‐bound using breadth‐first search.
In order to solve large Multidimensional Knapsack problems we examine a technique which decomposes problem instance into two parts. The first part is solved using traditional technique, such as Dynamic Programming, reduce the number of variables in by creating single variable with many non-dominated states. second remaining are determined an algorithm that repeatedly enumerates them different constraint and objective requirements. requirements imposed various states created this technique....