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Your search keyword '"SUZUKI, Kojiro"' showing total 1,112 results
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1,112 results on '"SUZUKI, Kojiro"'

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

Author

Suzuki, Kojiro, Kobayashi, Yusei, Yamazaki, Takashi, Tsuji, Toshikazu, and Arai, Noriyoshi

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

This study explores the stabilization mechanisms of concentrated emulsions with tunable morphology using amphiphilic polymer-grafted nanoparticles (PGNPs). We employ coarse-grained molecular simulations to investigate concentrated oil-in-water emulsions stabilized by partially hydrolyzed poly(vinyl alcohol)-grafted poly(methyl methacrylate) (PMMA) particles. Two grafting architectures were examined: hydrophilic-hydrophobic (AB-type) diblock PGNPs and reverse BA-type diblock PGNPs. Our findings reveal that AB-type diblock PGNPs tend to aggregate, leading to droplet-droplet coalescence. In contrast, BA-type diblock PGNPs disperse effectively in the water phase, stabilizing robust emulsion through a space-filling mechanism. The study further demonstrates that the stability and morphology of the emulsions can be tuned by varying the number of PGNPs. Our results suggest that BA-type diblock PGNPs are more effective in stabilizing concentrated emulsions, offering insights for the design of novel emulsifiers in industrial applications., Comment: 6 pages, 4 figures

Published
2024

4. Case Study of Model Experiments

Author

Araki, Susumu, primary, Suzuki, Kojiro, additional, Miyamoto, Junji, additional, Shimozono, Takenori, additional, Kato, Fuminori, additional, Suzuki, Takayuki, additional, and Maeda, Kenichi, additional

Published
2024
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5. HTSeg: Hybrid Two-Stage Segmentation Framework for Intestine Segmentation from CT Volumes

Author

An, Qin, Oda, Hirohisa, Hayashi, Yuichiro, Kitasaka, Takayuki, Takimoto, Aitaro, Hinoki, Akinari, Uchida, Hiroo, Suzuki, Kojiro, Oda, Masahiro, Mori, Kesaku, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Drechsler, Klaus, editor, Oyarzun Laura, Cristina, editor, Freiman, Moti, editor, Chen, Yufei, editor, Wesarg, Stefan, editor, and Erdt, Marius, editor

Published
2024
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6. Effect of Mass Flow Rate on Drag Reduction with Counter-Flow Jet in Laminar Hypersonic Flow at High Reynolds Number

Author

Yoon, Hee, Suzuki, Kojiro, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, and Fu, Song, editor

Published
2024
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7. M U-Net: Intestine Segmentation Using Multi-dimensional Features for Ileus Diagnosis Assistance

Author

An, Qin, Oda, Hirohisa, Hayashi, Yuichiro, Kitasaka, Takayuki, Hinoki, Akinari, Uchida, Hiroo, Suzuki, Kojiro, Takimoto, Aitaro, Oda, Masahiro, Mori, Kensaku, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wu, Shandong, editor, Shabestari, Behrouz, editor, and Xing, Lei, editor

Published
2024
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18. Visualizing intestines for diagnostic assistance of ileus based on intestinal region segmentation from 3D CT images

Author

Oda, Hirohisa, Nishio, Kohei, Kitasaka, Takayuki, Amano, Hizuru, Takimoto, Aitaro, Uchida, Hiroo, Suzuki, Kojiro, Itoh, Hayato, Oda, Masahiro, and Mori, Kensaku

Subjects
Electrical Engineering and Systems Science - Image and Video Processing, Computer Science - Computer Vision and Pattern Recognition
Abstract

This paper presents a visualization method of intestine (the small and large intestines) regions and their stenosed parts caused by ileus from CT volumes. Since it is difficult for non-expert clinicians to find stenosed parts, the intestine and its stenosed parts should be visualized intuitively. Furthermore, the intestine regions of ileus cases are quite hard to be segmented. The proposed method segments intestine regions by 3D FCN (3D U-Net). Intestine regions are quite difficult to be segmented in ileus cases since the inside the intestine is filled with fluids. These fluids have similar intensities with intestinal wall on 3D CT volumes. We segment the intestine regions by using 3D U-Net trained by a weak annotation approach. Weak-annotation makes possible to train the 3D U-Net with small manually-traced label images of the intestine. This avoids us to prepare many annotation labels of the intestine that has long and winding shape. Each intestine segment is volume-rendered and colored based on the distance from its endpoint in volume rendering. Stenosed parts (disjoint points of an intestine segment) can be easily identified on such visualization. In the experiments, we showed that stenosed parts were intuitively visualized as endpoints of segmented regions, which are colored by red or blue.

Published
2020

20. Subpleural fibrotic interstitial lung abnormalities are implicated in non-small cell lung cancer radiotherapy outcomes

Author

Ito Makoto, Katano Takuma, Okada Hiroaki, Sakuragi Ami, Minami Yoshitaka, Abe Souichiro, Adachi Sou, Oshima Yukihiko, Ohashi Wataru, Kubo Akihito, Fukui Takayuki, Ito Satoru, and Suzuki Kojiro

Subjects
interstitial lung abnormality, subpleural fibrosis, non-small cell lung cancer, radiotherapy, radiation pneumonitis, survival analysis, Medical physics. Medical radiology. Nuclear medicine, R895-920
Abstract

The relationship between interstitial lung abnormalities (ILAs) and the outcomes of lung cancer radiotherapy is unclear. This study investigated whether specific ILA subtypes are risk factors for radiation pneumonitis (RP).

Published
2023
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25. Entropy production-based nonlinear optimal perturbation for subsonic flows around an airfoil.

Author

Taniguchi, Nobutaka, Ohmichi, Yuya, and Suzuki, Kojiro

Subjects
FLUID dynamics, UNSTEADY flow, ENERGY dissipation, AEROFOILS, ENTROPY, SUBSONIC flow
Abstract

The extraction and time evolution of optimal perturbation (OP) offers abundant physical insights in fluid dynamics. Nonlinear OP (NLOP) analysis provides an approach for obtaining the trajectory to induce the maximum changes in the flow field. In an extension into unsteady flow field, we tracked the changes of trajectory by an application of initial perturbation field in the compressible Navier–Stokes equation, and we focused on the entropy production (EP) to characterize the trajectory. We proposed entropy production-based NLOP (EP-NLOP) analysis for compressible flows and investigated the effect of evaluation function on the extracted Ops using the subsonic flow around an airfoil. Compared with the conventional disturbance energy (DE-) based NLOP (DE-NLOP) analysis, we demonstrated that the OPs with different spatial wavelength and concentration regions were successfully extracted due to the different spatial sensitivity of evaluation function. In the EP-NLOP analysis, the spatial distribution of OP extracted the larger energy dissipation upstream of the separation points for the short evaluation time. For the long evaluation time, EP-NLOP analysis extracted the transient-time evolution of interacting separation vortices, attributing the multiple wavelengths of OPs. These differences in the OPs offer promising insights into fluid dynamics. [ABSTRACT FROM AUTHOR]

Published
2024
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26. Intestine Segmentation with Small Computational Cost for Diagnosis Assistance of Ileus and Intestinal Obstruction

Author

Oda, Hirohisa, Hayashi, Yuichiro, Kitasaka, Takayuki, Takimoto, Aitaro, Hinoki, Akinari, Uchida, Hiroo, Suzuki, Kojiro, Oda, Masahiro, Mori, Kensaku, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Oyarzun Laura, Cristina, editor, Cardoso, M. Jorge, editor, Rosen-Zvi, Michal, editor, Kaissis, Georgios, editor, Linguraru, Marius George, editor, Shekhar, Raj, editor, Wesarg, Stefan, editor, Erdt, Marius, editor, Drechsler, Klaus, editor, Chen, Yufei, editor, Albarqouni, Shadi, editor, Bakas, Spyridon, editor, Landman, Bennett, editor, Rieke, Nicola, editor, Roth, Holger, editor, Li, Xiaoxiao, editor, Xu, Daguang, editor, Gabrani, Maria, editor, Konukoglu, Ender, editor, Guindy, Michal, editor, Rueckert, Daniel, editor, Ziller, Alexander, editor, Usynin, Dmitrii, editor, and Passerat-Palmbach, Jonathan, editor

Published
2021
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34. Spaciousness Filters for Non-contrast CT Volume Segmentation of the Intestine Region for Emergency Ileus Diagnosis

Author

Oda, Hirohisa, Nishio, Kohei, Kitasaka, Takayuki, Villard, Benjamin, Amano, Hizuru, Chiba, Kosuke, Hinoki, Akinari, Uchida, Hiroo, Suzuki, Kojiro, Itoh, Hayato, Oda, Masahiro, Mori, Kensaku, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Greenspan, Hayit, editor, Tanno, Ryutaro, editor, Erdt, Marius, editor, Arbel, Tal, editor, Baumgartner, Christian, editor, Dalca, Adrian, editor, Sudre, Carole H., editor, Wells, William M., editor, Drechsler, Klaus, editor, Linguraru, Marius George, editor, Oyarzun Laura, Cristina, editor, Shekhar, Raj, editor, Wesarg, Stefan, editor, and González Ballester, Miguel Ángel, editor

Published
2019
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45. Low Reynolds number effect on hypersonic flow over a hemisphere with counter-flow jet.

Author

Yoon, Hee and Suzuki, Kojiro

Subjects
*DRAG reduction, *REYNOLDS number, *HYPERSONIC flow, *MACH number, *JETS (Fluid dynamics), *NAVIER-Stokes equations, *COUNTERFLOWS (Fluid dynamics)
Abstract

Among active flow control methods, a counter-flow jet is known to be efficient in supersonic to hypersonic flow regimes for drag reduction at high-Reynolds number regime. In order to apply the counter-flow jet in various flight environments, it is necessary to investigate the effect of drag reduction at not only low and medium altitudes but also high ones with low atmospheric density. To investigate the effect of the Reynolds number on drag reduction with the counter-flow jet, the stagnation pressure ratio (PR) defined as the ratio of the stagnation pressure of the counter-flow jet to that of the free-stream flow is fixed to 1.05, at which the flow field is known to be classified as short penetration mode (SPM) in high-Reynolds number regime. The Mach numbers of the free-stream flow and counter-flow jet are 6 and 2.86, respectively. The stagnation pressure of the free-stream flow is varied from 6.9 kPa to 20 kPa and the stagnation temperature of the free-stream flow and counter-flow jet is 610 K and 294 K, respectively. The maximum Knudsen number based on the radius of the hemisphere model is 0.01. The numerical simulations were performed solving the laminar, unsteady, axisymmetric Navier-Stokes equations by the symmetric TVD scheme with the second-order accuracy in space and the explicit strong stability preserving Runge-Kutta (SSPRK) method. The numerical results show that at the same stagnation PR, shock structure, the penetration length to the flow field, and drag reduction effect are almost identical irrespective of the difference in the free-stream stagnation pressure. Moreover, by decreasing the Reynolds number, the flow field becomes more stable due to the viscosity effect. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Role of viscosity in macroscopic description of cluster formation in granular flow.

Author

Suzuki, Kojiro

Subjects
*GRANULAR flow, *FLUID dynamics, *VISCOSITY, *GLASS beads, *NUMERICAL analysis, *ENTROPY
Abstract

The numerical analysis was made to simulate the cluster formation in granular flows, which was seen on a sheet of free-falling small glass beads, in a framework of the macroscopic fluid dynamics using the Compressible and Non-Expanding (CNE) fluid model developed by the author. In the CNE fluid model, the resistance against compression is represented by the pressure that is given as a function of density. Introducing two different paths for the change in the pressure and the density, that is, the irreversible compression and the elastic unloading/re-compression, and setting the speed of sound in the latter to be much higher than that in the former, almost monotonic increase in the density is described, because the density decrease in the unloading process becomes small. In the two-dimensional hypothetical problem, the stripe pattern was successfully simulated solving the Euler or Navier-Stokes analyses with the CNE fluid model. The mechanism of the pattern formation was considered in terms of the entropy change in time and space. The roles of the pressure and the viscosity in the formation of the stripe pattern were also investigated. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Thermal fluctuations of granular gas under HCS using two-point kinetic theory

Author

Yano, Ryosuke and Suzuki, Kojiro

Subjects
Physics - Fluid Dynamics
Abstract

Thermal fluctuations of the granular gas under the homogeneous cooling state (HCS) are estimated using two-point kinetic theory by Tsuge-Sagara. Thermal fluctuations of the elastic gas are modified for the granular gas by nonequilibrium moments, which defines the distribution function under the HCS. The deviations of thermal fluctuations for the granular gas from those for the elastic gas obtained by the fluctuation-dissipation theorem are calculated as a function of the restitution coefficient.

Published
2011

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