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120 results on '"Koide, Yusuke"'

1. Brownian simulations for fracture of star polymer phantom networks

Author

Masubuchi, Yuichi, Koide, Yusuke, Ishida, Takato, and Uneyama, Takashi

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

Based on a recent simulation study [Masubuchi et al., Macromolecules, 56, 9359 (2023)], the cycle rank plays a significant role in determining the fracture characteristics of network polymers. However, the study only considered energy-minimized networks without the effects of thermal agitation. We conducted Brownian dynamics simulations at various stretch rates to address this gap. The results showed that even with Brownian motion, the strain and stress at the break obtained for different node functionalities and conversion ratios exhibited master curves if plotted against cycle rank. These master curves were dependent on the strain rate, with the curves tending to approach those observed in energy-minimized simulations as the strain rate decreased, even though the fracture process was affected by the competition against Brownian motion, elongation, and bond degradation., Comment: 12 pages, 4 figures

Published
2024

2. Reverse non-equilibrium molecular dynamics simulations of a melt of Kremer-Grest type model under fast shear

Author

Oishi, Tatsuma, Koide, Yusuke, Ishida, Takato, Uneyama, Takashi, Masubuchi, Yuichi, and Müller-Plathe, Florian

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

Although the reverse non-equilibrium molecular dynamics (RNEMD) simulation method has been widely employed, the range of applicability is yet to be discussed. In this study, for the first time, we systematically examine the method against an unentangled melt of the Kremer-Grest type chain. The simulation results indicate that as the shear rate increases, the temperature and density become inhomogeneous. However, the average viscosity remains consistent with the results obtained using the SLLOD method under homogeneous temperature and density. We also confirm that the temperature-density inhomogeneity does not significantly affect polymer conformation.

Published
2024

3. Phantom chain simulations for fracture of star polymer networks with various strand densities

Author

Masubuchi, Yuichi, Ishida, Takato, Koide, Yusuke, and Uneyama, Takashi

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

Despite many attempts, the relation between fracture and structure of polymer networks is yet to be clarified. For this problem, a recent study for phantom chain simulations [Macromolecules, 56, 9359 (2023)] has demonstrated that the fracture characteristics obtained for polymer networks with various node functionalities and conversion ratios lie on master curves if they are plotted against cycle rank. In this study, we extended the simulation to the effect of prepolymer concentration on the relationships between cycle rank and fracture characteristics within the concentration range of 1

Published
2024
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4. Predictive factors for dissection-free sentinel node micrometastases in early oral squamous cell carcinoma

Author

Matsuzuka, Takashi, Tsukahara, Kiyoaki, Yoshimoto, Seiichi, Chikamatsu, Kazuaki, Shiotani, Akihiro, Oze, Isao, Murakami, Yoshiko, Shinozaki, Takeshi, Enoki, Yuichiro, Ohba, Shinichi, Kawakita, Daisuke, Hanai, Nobuhiro, Koide, Yusuke, Sawabe, Michi, Nakata, Yusuke, Fukuda, Yujiro, Nishikawa, Daisuke, Takano, Gaku, Kimura, Takahiro, Oguri, Keisuke, Hirakawa, Hitoshi, and Hasegawa, Yasuhisa

Published
2023
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5. Recombination statistics of nonionic surfactant micelles at equilibrium.

Author

Koide, Yusuke

Subjects
*MICELLAR solutions, *MICELLES, *PROBABILITY density function, *PARTICLE dynamics, *EQUILIBRIUM, *SURFACE active agents
Abstract

We conduct dissipative particle dynamics simulations of nonionic surfactant solutions to investigate the statistical properties of micellar recombination. We categorize the recombination events into self-recombination, where two micelles created by scission join together, and non-self-recombination. We find that these two recombination events exhibit distinct statistical properties. The probability density function of the recombination time for self-recombination follows a power law, and we show that the mean squared displacement of the surfactants determines the exponent of the power law. In contrast, the survival function for non-self-recombination is exponential, which is consistent with the mean-field model. For non-self-recombination, we evaluate the mean recombination time for various aggregation numbers, temperatures, and surfactant volume fractions. We find a scaling law describing the mean recombination time of the micelles at equilibrium. [ABSTRACT FROM AUTHOR]

Published
2023
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6. Predictive factors for false negatives following sentinel lymph node biopsy in early oral cavity cancer

Author

Miura, Kouki, Kawakita, Daisuke, Oze, Isao, Suzuki, Motoyuki, Sugasawa, Masashi, Endo, Kazuhira, Sakashita, Tomohiro, Ohba, Shinichi, Suzuki, Mikio, Shiotani, Akihiro, Kohno, Naoyuki, Maruo, Takashi, Suzuki, Chiaki, Iki, Takehiro, Hiwatashi, Nao, Matsumoto, Fumihiko, Kobayashi, Kenya, Toyoda, Minoru, Hanyu, Kenji, Koide, Yusuke, Murakami, Yoshiko, and Hasegawa, Yasuhisa

Published
2022
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8. A Multi-Line Ammonia Survey of the Galactic Center Region with the Tsukuba 32-m Telescope - I. Observations and Data

Author

Arai, Hitoshi, Nagai, Makoto, Fujita, Shinji, Nakai, Naomasa, Seta, Masumichi, Yamauchi, Aya, Kaneko, Hiroyuki, Hagiwara, Kenzaburo, Mamyoda, Koh-ichi, Miyamoto, Yusuke, Horie, Masa-aki, Ishii, Shun, Koide, Yusuke, Ogino, Mitsutoshi, Maruyama, Masaki, Hirai, Katsuaki, Oshiro, Wataru, Nagai, Satoshi, Akiyama, Daiki, Konakawa, Keita, Nonogawa, Hiroaki, Salak, Dragan, Terabe, Yuki, Nihonmatsu, Yoshiki, and Funahashi, Fumiyoshi

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present survey data of the NH3 (J, K) = (1, 1)--(6, 6) lines, simultaneously observed with the Tsukuba 32-m telescope, in the main part of the central molecular zone of the Galaxy. The total number of on-source positions was 2655. The lowest three transitions were detected with S/N > 3 at 2323 positions (93% of all the on-source positions). Among 2323, the S/N of (J, K ) = (4, 4), (5, 5), and (6, 6) exceeded 3.0 at 1426 (54%), 1150 (43%), and 1359 (51%) positions, respectively. Simultaneous observations of the lines enabled us to accurately derive intensity ratios with less systematic errors. Boltzmann plots indicate there are two temperature components: cold ($\sim$ 20 K) and warm ($\sim$ 100 K). Typical intensity ratios of Tmb(2,2)/Tmb(1,1), Tmb(4,4)/Tmb(2,2), Tmb(5,5)/Tmb(4,4), and Tmb(6,6)/Tmb(3,3) were 0.71, 0.45, 0.65, and 0.17, respectively. These line ratios correspond to diversity of rotational temperature, which results from mixing of the two temperature components., Comment: 19 pages, 11 figures

Published
2016
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9. Flow-induced scission of wormlike micelles in nonionic surfactant solutions under shear flow.

Author

Koide, Yusuke and Goto, Susumu

Subjects
*MICELLES, *PARTICLE dynamics, *AGGREGATION (Statistics), *SURFACE active agents
Abstract

We investigate flow-induced scission of wormlike micelles with dissipative particle dynamics simulations of nonionic surfactant solutions under shear flow. To understand flow-induced scission in terms of micellar timescales, we propose a method to evaluate the longest relaxation time of unentangled surfactant micelles from the rotational relaxation time and the average lifetime at equilibrium. The mean squared displacement of surfactant molecules provides evidence that the longest relaxation time estimated by the proposed method serves as the characteristic timescale at equilibrium. We also demonstrate that the longest relaxation time plays an essential role in flow-induced scission. Using conditional statistics based on the aggregation number of micelles, we examine the statistical properties of the lifetime of wormlike micelles. We then conclude that flow-induced scission occurs when the Weissenberg number defined as the product of the longest relaxation time and the shear rate is larger than a threshold value. [ABSTRACT FROM AUTHOR]

Published
2022
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15. Combination therapy of oncolytic herpes simplex virus HF10 and bevacizumab against experimental model of human breast carcinoma xenograft

Author

Tan, Gewen, Kasuya, Hideki, Sahin, Tevfik Tolga, Yamamura, Kazuo, Wu, Zhiwen, Koide, Yusuke, Hotta, Yoshihiro, Shikano, Toshio, Yamada, Suguru, Kanzaki, Akiyuki, Fujii, Tsutomu, Sugimoto, Hiroyuki, Nomoto, Shuji, Nishikawa, Yoko, Tanaka, Maki, Tsurumaru, Naoko, Kuwahara, Toshie, Fukuda, Saori, Ichinose, Toru, Kikumori, Toyone, Takeda, Shin, Nakao, Akimasa, and Kodera, Yasuhiro

Published
2015
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17. p16-positive oropharyngeal cancer with rare thyroid metastasis : A case report

Author

Suzuki, Hidenori, Sasaki, Eiichi, Nishikawa, Daisuke, Koide, Yusuke, Beppu, Shintaro, Terada, Hoshino, Hanai, Nobuhiro, Suzuki, Hidenori, Sasaki, Eiichi, Nishikawa, Daisuke, Koide, Yusuke, Beppu, Shintaro, Terada, Hoshino, and Hanai, Nobuhiro

Abstract

Thyroid metastasis is rarely diagnosed, and the treatment outcomes in p16-positive oropharyngeal squamous cell carcinoma patients with rare thyroid metastasis have not been fully investigated. Here we describe the case of a patient with p16-positive oropharyngeal squamous cell carcinoma who was diagnosed with cT4 N2M1 with rare thyroid metastasis. The patient was a current smoker and was positive for human papillomavirus DNA, with disease progression at 49 days and death at 113 days after completion of cisplatin-based concurrent chemoradiotherapy.

Published
2020

18. Fluid flow and heat transfer in two-pass smooth rectangular channels with different turn clearances

Author

Nakayama, Hiroshi, Hirota, Masafumi, Fujita, Hideomi, Yamada, Takeshi, and Koide, Yusuke

Subjects
Fluid dynamics -- Analysis, Science and technology
Abstract

Flow characteristics in stationary two-pass channels with a sharp 180-deg turn have been measured using LDV (laser Doppler velocimeter), directing special attention to the influence of the size of the turn clearance on the flow structure. The main features of the flow, flow separation and recirculation, secondary flow, turbulence intensities, measured with Re = 3.5 x [10.sup.4] for three turn clearances, are presented. A close comparison of the velocity data with local Sherwood number distributions on the channel walls reveals that the wall-normal velocity mainly dominates the heat transfer in the channel, but the wall-parallel component also contributes locally to heat transfer after the turn.

Published
2006

24. Combination of Cetuximab and Oncolytic Virus Canerpaturev Synergistically Inhibits Human Colorectal Cancer Growth

Author

Wu, Zhiwen, primary, Ichinose, Toru, additional, Naoe, Yoshinori, additional, Matsumura, Shigeru, additional, Villalobos, Itzel Bustos, additional, Eissa, Ibrahim Ragab, additional, Yamada, Suguru, additional, Miyajima, Noriyuki, additional, Morimoto, Daishi, additional, Mukoyama, Nobuaki, additional, Nishikawa, Yoko, additional, Koide, Yusuke, additional, Kodera, Yasuhiro, additional, Tanaka, Maki, additional, and Kasuya, Hideki, additional

Published
2019
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25. Superficial Esophageal Cancer in a Fanconi Anemia Patient That Was Treated Successfully by Endoscopic Submucosal Resection

Author

Onishi, Sachiyo, primary, Tajika, Masahiro, additional, Tanaka, Tsutomu, additional, Ishihara, Makoto, additional, Hirayama, Yutaka, additional, Mizuno, Nobumasa, additional, Kuwahara, Takamichi, additional, Okuno, Nozomi, additional, Matsumoto, Shinpei, additional, Toriyama, Kazuhiro, additional, Kurita, Yusuke, additional, Obata, Masanori, additional, Koide, Yusuke, additional, Hasegawa, Yasuhisa, additional, Hara, Kazuo, additional, and Niwa, Yasumasa, additional

Published
2019
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39. Treatment package time predicts cancer-specific survival and distant metastasis in laryngeal cancer.

Author

Suzuki, Hidenori, Terada, Hoshino, Hanai, Nobuhiro, Nishikawa, Daisuke, Koide, Yusuke, Beppu, Shintaro, Kodaira, Takeshi, Tachibana, Hiroyuki, Koide, Yutaro, Tanaka, Hiroshi, and Hasegawa, Yasuhisa

Subjects
LARYNGEAL cancer, TUMOR surgery, LARYNGECTOMY, LOG-rank test, PROPORTIONAL hazards models, RADIOTHERAPY
Abstract

We investigated whether treatment package time was significantly associated with survival outcomes of resectable locally-advanced laryngeal squamous cell carcinoma in patients who consecutively underwent various treatments, including surgery alone and salvage surgery for residual tumor. A total of 100 patients with clinical T3-T4 resectable laryngeal squamous cell carcinoma were enrolled in this study. The treatment package time was calculated in days between the start of any treatment and the end of all treatments, including postoperative radiotherapy and salvage surgery for residual tumors. Using a log-rank test, a treatment package time of ≥68 days showed significantly shorter cancer-specific (P=0.0013) and distant metastasis-free survival (P=0.0017), compared with a treatment package time of <68 days. Multivariate survival analyses of two Cox's hazards proportional models was conducted. In both model-1, which adjusted for cT3/cT4, cN0-1/cN2-3 and total laryngectomy/non-total laryngectomy, and model-2, which adjusted for cT3/cT4, cN0-1/cN2-3 and induction therapy/non-induction therapy, the cancer-specific survival and distant metastasis-free survival, according to treatment package time, were significantly longer with <68 days compared with ≥68 days (P<0.01). The present study demonstrated that a prolonged treatment package time is a prognostic factor for shorter cancer-specific and distant metastasis-free survival after various treatments for resectable locally-advanced laryngeal cancer. [ABSTRACT FROM AUTHOR]

Published
2019

40. Reverse Nonequilibrium Molecular Dynamics Simulations of a Melt of Kremer-Grest Type Model under Fast Shear

Author

Oishi, Tatsuma, Koide, Yusuke, Ishida, Takato, Uneyama, Takashi, Masubuchi, Yuichi, and Müller-Plathe, Florian

Abstract

Although the reverse nonequilibrium molecular dynamics (RNEMD) simulation method has been widely employed, the range of applicability is yet to be discussed. In this study, for the first time, we systematically examine the method against an unentangled melt of the Kremer-Grest type chain. The simulation results indicate that as the shear rate increases, the temperature and density become inhomogeneous. However, the average viscosity remains consistent with the results obtained using the SLLOD method under homogeneous temperature and density. We also confirm that the temperature-density inhomogeneity does not significantly affect polymer conformation.

Published
2024
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41. A multi-line ammonia survey of the Galactic center region with the Tsukuba 32 m telescope. I. Observations and data

Author

Arai, Hitoshi, primary, Nagai, Makoto, additional, Fujita, Shinji, additional, Nakai, Naomasa, additional, Seta, Masumichi, additional, Yamauchi, Aya, additional, Kaneko, Hiroyuki, additional, Hagiwara, Kenzaburo, additional, Mamyoda, Koh-ichi, additional, Miyamoto, Yusuke, additional, Horie, Masa-aki, additional, Ishii, Shun, additional, Koide, Yusuke, additional, Ogino, Mitsutoshi, additional, Maruyama, Masaki, additional, Hirai, Katsuaki, additional, Oshiro, Wataru, additional, Nagai, Satoshi, additional, Akiyama, Daiki, additional, Konakawa, Keita, additional, Nonogawa, Hiroaki, additional, Salak, Dragan, additional, Terabe, Yuki, additional, Nihonmatsu, Yoshiki, additional, and Funahashi, Fumiyoshi, additional

Published
2016
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47. Combination therapy of oncolytic herpes simplex virus HF10 and bevacizumab against experimental model of human breast carcinoma xenograft

Author

Tan, Gewen, primary, Kasuya, Hideki, additional, Sahin, Tevfik Tolga, additional, Yamamura, Kazuo, additional, Wu, Zhiwen, additional, Koide, Yusuke, additional, Hotta, Yoshihiro, additional, Shikano, Toshio, additional, Yamada, Suguru, additional, Kanzaki, Akiyuki, additional, Fujii, Tsutomu, additional, Sugimoto, Hiroyuki, additional, Nomoto, Shuji, additional, Nishikawa, Yoko, additional, Tanaka, Maki, additional, Tsurumaru, Naoko, additional, Kuwahara, Toshie, additional, Fukuda, Saori, additional, Ichinose, Toru, additional, Kikumori, Toyone, additional, Takeda, Shin, additional, Nakao, Akimasa, additional, and Kodera, Yasuhiro, additional

Published
2014
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48. Neck dissection after chemoradiotherapy

Author

Hanai, Nobuhiro, primary, Ozawa, Taijiro, additional, Hirakawa, Hitoshi, additional, Suzuki, Hidenori, additional, Fukuda, Yujiro, additional, Koide, Yusuke, additional, Beppu, Shintaro, additional, Nishikawa, Daisuke, additional, Nakata, Yusuke, additional, Kimura, Takahiro, additional, and Hasegawa, Yasuhisa, additional

Published
2014
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50. Clinical study of postoperative delirium in head and neck cancer with reconstructive surgery

Author

Fukuda, Yujiro, primary, Hanai, Nobuhiro, additional, Ozawa, Taijiro, additional, Hirakawa, Hitoshi, additional, Suzuki, Hidenori, additional, Koide, Yusuke, additional, Kimura, Takahiro, additional, Beppu, Shintaro, additional, Nakata, Yusuke, additional, Nishikawa, Daisuke, additional, Yamashita, Hiroshi, additional, and Hasegawa, Yasuhisa, additional

Published
2013
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