Fractal energy gaps and topological invariants in hBN/graphene/hBN double moiré systems

H Oka, M Koshino - Physical Review B, 2021 - APS
We calculate the electronic structure in quasiperiodic double moiré systems of graphene
sandwiched by hexagonal boron nitride (hBN) and identify the characteristic integers of energy …

Topological invariants in two-dimensional quasicrystals

M Koshino, H Oka - Physical Review Research, 2022 - APS
We provide a topological concept to characterize energy gaps in general two-dimensional
quasiperiodic systems. We show that every single gap is uniquely characterized by a set of …

Association of fatigue and stress with gray matter volume

K Kokubun, K Nemoto, H Oka, H Fukuda… - Frontiers in Behavioral …, 2018 - frontiersin.org
Stress is associated with a greater risk for various health problems including reduced gray
matter volume (GMV) and density in a number of brain regions. Previous studies show that …

A simple and sensitive method for the determination of hydroxylamine in fresh-water samples using hypochlorite followed by gas chromatography

Y Seike, R Fukumori, Y Senga, H Oka… - Analytical …, 2004 - jstage.jst.go.jp
Nitrogenous species, such as ammonia, nitrite, nitrate, hydroxylamine (NH2OH) and nitrous
oxide (N2O), are recycling through microbial processes in the hydrosphere. 1–3 NH2OH has …

MRI-based Brain Healthcare Quotients: A bridge between neural and behavioral analyses for keeping the brain healthy

K Nemoto, H Oka, H Fukuda, Y Yamakawa - PLoS One, 2017 - journals.plos.org
Neurological and psychiatric disorders are a burden on social and economic resources.
Therefore, maintaining brain health and preventing these disorders are important. While the …

Radiomics-based prediction of recurrence for head and neck cancer patients using data imbalanced correction

H Oka, D Kawahara, Y Murakami - Computers in Biology and Medicine, 2024 - Elsevier
Objectives To propose a radiomics-based prediction model for head and neck squamous
cell carcinoma (HSNCC) recurrence after radiation therapy using a novel data imbalance …

Parametric study on unit step responses of impulse voltage measuring systems based on FDTD simulations

H Oka, Y Baba, M Ishii, N Nagaoka… - IEEE Transactions on …, 2012 - ieeexplore.ieee.org
Unit step responses (USRs) of a USR-measuring system recommended by the International
Electrotechnical Commission have been computed using the finite-difference time-domain (…

Neuronal pathway from the liver modulates energy expenditure and systemic insulin sensitivity

…, H Mizuguchi, T Asano, M Shiota, M Nakazato, Y Oka - Science, 2006 - science.org
Coordinated control of energy metabolism and glucose homeostasis requires communication
between organs and tissues. We identified a neuronal pathway that participates in the …

Comparison of the complete DNA sequences of the Oka varicella vaccine and its parental virus

Y Gomi, H Sunamachi, Y Mori, K Nagaike… - Journal of …, 2002 - Am Soc Microbiol
… The DNA sequences of the Oka varicella vaccine virus (V-Oka) and its parental virus (P-Oka) …
Further DNA sequence analysis showed that these substitutions were specific for V-Oka

Describing long-term electricity demand scenarios in the telecommunications industry: a case study of Japan

…, Y Umeda, Y Shimoda, M Hara, A Sakurai, H Oka… - Sustainability, 2016 - mdpi.com
Due to the rapid expansion of information and communication technology (ICT) usage, the
telecommunications industry is faced with a challenge to promote green ICT toward achieving …