Machine learning to improve efficiency of non-empirical interaction parameter for dissipative particle dynamics (DPD) simulation

H Doi, S Matsuoka, K Okuwaki, R Hatada… - Japanese Journal of …, 2023 - iopscience.iop.org
We have attempted to use machine learning to streamline the calculation of non-empirical
parameters for use in dissipative particle dynamics simulations. We replaced the calculation …

Theoretical analyses on water cluster structures in polymer electrolyte membrane by using dissipative particle dynamics simulations with fragment molecular orbital …

K Okuwaki, Y Mochizuki, H Doi, S Kawada, T Ozawa… - RSC …, 2018 - pubs.rsc.org
The mesoscopic structures of polymer electrolyte membrane (PEM) affect the performances
of fuel cells. Nafion® with the Teflon® backbone has been the most widely used of all PEMs …

Dissipative particle dynamics simulation for peptoid nanosheet with non-empirical parameter set

Y Tachino, K Okuwaki, H Doi, K Akisawa… - Japanese Journal of …, 2023 - iopscience.iop.org
Peptoids are biomimetic materials in which the substituent groups are located on the
nitrogen atom of the peptide bond, facilitating the formation of nanosheet structures as …

Fragment molecular orbital based parametrization procedure for mesoscopic structure prediction of polymeric materials

K Okuwaki, Y Mochizuki, H Doi… - The Journal of Physical …, 2018 - ACS Publications
In the analyses of miscibility behaviors of macromolecules and polymers, dissipative particle
dynamics (DPD) simulations are generally performed. In these simulations, the so-called χ …

The ABINIT-MP Program

Y Mochizuki, T Nakano, K Sakakura, Y Okiyama… - Recent Advances of the …, 2021 - Springer
We have been developing the ABINIT-MP program system as an original code for the
fragment molecular orbital (FMO) calculations. ABINIT-MP has several unique features such …

Development of reverse mapping system bridging dissipative particle dynamics and fragment molecular orbital calculation

K Okuwaki, H Doi, T Ozawa… - Japanese Journal of …, 2023 - iopscience.iop.org
We have developed a reverse mapping system to convert mesoscale structures generated
by dissipative particle dynamics (DPD) simulations into nanoscale structures. This system is …

DPD simulation to reproduce lipid membrane microdomains based on fragment molecular orbital calculations

H Doi, Y Osada, Y Tachino, K Okuwaki… - Applied Physics …, 2024 - iopscience.iop.org
Lipid domains play a critical role in signal transduction and transport across cell
membranes. The formation of domains in" HLC" ternary lipid bilayers composed of high …

Novel stabilization mechanisms for concentrated emulsions with tunable morphology via amphiphilic polymer-grafted nanoparticles

K Suzuki, Y Kobayashi, T Yamazaki, T Tsuji… - arXiv preprint arXiv …, 2024 - arxiv.org
This study explores the stabilization mechanisms of concentrated emulsions with tunable
morphology using amphiphilic polymer-grafted nanoparticles (PGNPs). We employ coarse …

Extension to Multiscale Simulations

K Okuwaki, T Ozawa, Y Mochizuki - Recent Advances of the Fragment …, 2021 - Springer
Fragment molecular orbital (FMO) methods (Fedorov and Kitaura The fragment molecular
orbtial method: practical applications to large molecular systems, CRC Press, Boca Raton …

Latest Functions of J-OCTA, Multiscale Simulation Software for Soft Materials

H YOSHIDA, K OHATA, T MAEDA, H NITTA… - … GAKKAISHI (Journal of …, 2018 - jstage.jst.go.jp
J-OCTA is the integrated simulation system for soft materials, which includes various kinds of
modeling tools and simulation engines to perform multiscale simulation. Recently some new …