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932 results on '"Tsuzuki S"'

1. Convergence study and optimal weight functions of an explicit particle method for the incompressible Navier--Stokes equations

Author

Imoto, Y., Tsuzuki, S., and Nishiura, D.

Subjects
Mathematics - Numerical Analysis, Computer Science - Computational Engineering, Finance, and Science, 65N12, 76D05
Abstract

To increase the reliability of simulations by particle methods for incompressible viscous flow problems, convergence studies and improvements of accuracy are considered for a fully explicit particle method for incompressible Navier--Stokes equations. The explicit particle method is based on a penalty problem, which converges theoretically to the incompressible Navier--Stokes equations, and is discretized in space by generalized approximate operators defined as a wider class of approximate operators than those of the smoothed particle hydrodynamics (SPH) and moving particle semi-implicit (MPS) methods. By considering an analytical derivation of the explicit particle method and truncation error estimates of the generalized approximate operators, sufficient conditions of convergence are conjectured.Under these conditions, the convergence of the explicit particle method is confirmed by numerically comparing errors between exact and approximate solutions. Moreover, by focusing on the truncation errors of the generalized approximate operators, an optimal weight function is derived by reducing the truncation errors over general particle distributions. The effectiveness of the generalized approximate operators with the optimal weight functions is confirmed using numerical results of truncation errors and driven cavity flow. As an application for flow problems with free surface effects, the explicit particle method is applied to a dam break flow., Comment: 27 pages, 13 figures

Published
2019
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11. Investigation and public health response to a COVID-19 outbreak in a rural resort community-Blaine County, Idaho, 2020

Author

Tsuzuki, S, Dunne, EM, Maxwell, T, Dawson-Skuza, C, Burns, M, Ball, C, Turner, K, Hahn, CG, Bowyer, M, Carter, KK, Hudson, L, Tsuzuki, S, Dunne, EM, Maxwell, T, Dawson-Skuza, C, Burns, M, Ball, C, Turner, K, Hahn, CG, Bowyer, M, Carter, KK, and Hudson, L

Abstract

Blaine County, Idaho, a rural area with a renowned resort, experienced a COVID-19 outbreak early in the pandemic. We undertook an epidemiologic investigation to describe the outbreak and guide public health action. Confirmed cases of COVID-19 were identified from reports of SARS-CoV-2-positive laboratory test results to South Central Public Health District. Information on symptoms, hospitalization, recent travel, healthcare worker status, and close contacts was obtained by medical record review and patient interviews. Viral sequence analysis was conducted on a subset of available specimens. During March 13-April 10, 2020, a total of 451 COVID-19 cases among Blaine County residents (1,959 cases per 100,000 population) were reported, with earliest illness onset March 1. The median patient age was 51 years (interquartile range [IQR]: 37-63), 52 (11.5%) were hospitalized, and 5 (1.1%) died. The median duration between specimen collection and a positive laboratory result was 9 days (IQR: 4-10). Forty-four (9.8%) patients reported recent travel and an additional 37 cases occurred in out-of-state residents. Healthcare workers comprised 56 (12.4%) cases; 33 of whom worked at the only hospital in the county, leading to a 15-day disruption of hospital services. Among 562 close contacts monitored by public health authorities, laboratory-confirmed COVID-19 or compatible symptoms were identified in 51 (9.1%). Sequencing results from 34 specimens supported epidemiologic findings indicating travel as a source of SARS-CoV-2, and identified multiple lineages among hospital workers. Community mitigation strategies included school and resort closure, stay-at-home orders, and restrictions on incoming travelers. COVID-19 outbreaks in rural communities can disrupt health services. Lack of local laboratory capacity led to long turnaround times for COVID-19 test results. Rural communities frequented by tourists face unique challenges during the COVID-19 pandemic. Implementing restrictions

Published
2021

18. Nightlife clusters of coronavirus disease in Tokyo between March and April 2020

Author

Takaya, S., primary, Tsuzuki, S., additional, Hayakawa, K., additional, Kawashima, A., additional, Okuhama, A., additional, Kanda, K., additional, Suzuki, T., additional, Akiyama, Y., additional, Miyazato, Y., additional, Ide, S., additional, Nakamura, K., additional, Nomoto, H., additional, Nakamoto, T., additional, Hikida, S., additional, Tanuma, J., additional, Ohara, K., additional, Ito, T., additional, Baba, T., additional, Yamamoto, K., additional, Ujiie, M., additional, Saito, S., additional, Morioka, S., additional, Ishikane, M., additional, Kinoshita, N., additional, Kutsuna, S., additional, and Ohmagari, N., additional

Published
2020
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19. A case of urinary bladder metastasis of hepatocellular carcinoma following use of immunotherapy/tyrosine kinase inhibitor

Author

Keiichiro Miyajima, Fumihiko Urabe, Tsuzuki Shunsuke, Sato Shun, Hiroyuki Takahashi, Koji Asano, Mitsuru Yanagaki, Michinori Matsumoto, Toru Ikegami, and Takahiro Kimura

Subjects
bladder metastasis, hepatocellular carcinoma, IO/TKI, Diseases of the genitourinary system. Urology, RC870-923
Abstract

Introduction Here we present a rare case of hepatocellular carcinoma metastasis to the urinary bladder in a patient with metastatic HCC. Case presentation An 83‐year‐old man developed gross hematuria during combined treatment with an anti‐programmed death‐ligand 1 inhibitor and an anti‐vascular endothelial growth factor for metastatic HCC. A contrast‐enhanced CT revealed a 15 × 15 mm soft tissue mass protruding from the posterior bladder wall. Cystoscopy further revealed a solitary submucosal mass located on the posterior wall. The patient underwent transurethral resection of bladder tumor. The pathological findings were consistent with a diagnosis of bladder metastasis from HCC. Following a 3‐week interval after the surgical intervention, salvage therapy was resumed. Conclusion During follow‐up after TUR‐BT in HCC patients who present with a bladder tumor, the possibility of HCC metastases to the urinary bladder should be excluded.

Published
2023
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22. Length of stay, hospitalisation costs and in-hospital mortality of methicillin-susceptible and methicillin-resistant Staphylococcus aureus bacteremia in Japan.

Author

Tsuzuki, S., Yu, J., Matsunaga, N., and Ohmagari, N.

Subjects
*BACTEREMIA, *LENGTH of stay in hospitals, *METHICILLIN-resistant staphylococcus aureus, *MEDICAL care costs, *TERTIARY care, *STAPHYLOCOCCAL diseases, *HOSPITAL mortality, *HOSPITAL care, *DESCRIPTIVE statistics, *COST analysis, *ECONOMIC aspects of diseases, *MICROBIAL sensitivity tests
Abstract

To examine the length of stay, hospitalisation costs and case fatality of methicillin-susceptible and -resistant Staphylococcus aureus (MSSA and MRSA) bacteremia in Japan. Retrospective cohort study. Patients with a diagnosis of S. aureus bacteremia who were admitted to a tertiary care hospital (the National Centre for Global Health and Medicine [NCGM]) in Tokyo, Japan, between 1st January 2016 and 31st December 2020 were included in the study. We combined Japan Nosocomial Infections Surveillance data and Diagnosis Procedure Combination data at NCGM from 2016 to 2020. The data were stratified into MSSA and MRSA groups. Length of stay (LoS), LoS after submission of a blood culture specimen (LoS-after), hospitalisation cost, hospitalisation costs per day and clinical outcome were compared after propensity score matching. Median LoS was 46 (interquartile range [IQR] 28.5–64.5) days in the MSSA group and 66 (IQR 40–91) days in the MRSA group (P = 0.020). Median LoS-after was 38 (IQR 25–62.5) days and 45 (IQR 24–63) days (P = 0.691) in the MSSA and MRSA groups, respectively. Median hospitalisation cost was significantly higher in the MRSA group (26,035 [IQR 18,154–47,362] USD) than in the MSSA group (19,823 [IQR 13,764–32,042] USD) (P = 0.036), but cost per day was not (MRSA: 528.9 [IQR 374.9–647.4] USD; MSSA: 455.6 [IQR 359.2–701.7] USD; P = 0.990). Case fatality rate was higher in the MRSA group than in the MSSA group (22/60 vs 9/60, P = 0.012). Patients with MRSA bacteremia had longer LoS and higher costs than those with MSSA bacteremia. However, LoS-after and hospitalisation costs per day were not different. The longer LoS of patients in Japan compared with other countries might contribute to the higher disease burden of S. aureus bacteremia in Japan. [ABSTRACT FROM AUTHOR]

Published
2021
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25. Large-scale simulations of viscoelastic deformable multi-body systems using quadruple discrete element method on supercomputers

Author

Tsuzuki, S., Daisuke Nishiura, and Sakaguchi, H.

Subjects
Finite element method, Elements finits, Mètode dels, Particle-based Methods, Multi-body Problems, Contact Problems, Viscoelastic Materials, Parallel Computing, Coupled problems (Complex systems) -- Numerical solutions, Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC]
Abstract

Contact problems among viscoelastic materials in the multibody system is one of the challenging topics in science and many engineering applications. We have developed an effective simulation method of combining QDEM (Quadruple Discrete Element Method) for the deformation analysis of structures with the DEM for the collisions among structures. However, it is still difficult to reproduce surface topography of structures because particles only set on four nodes of tetrahedrons in our current method. In this paper, QDEMSM (QDEM with Surface Modeling) is newly developed. Point-polygon collisions and line-line collisions are effectively coupled with QDEM. Our improved method was validated by several simulation results; domino simulations using the 40 pieces of shogi (= Japanese chess) were successfully carried out. It was also found the friction forces acted on the surface critically effected on the propagation speeds of contact forces. In parallel computing, by applying the space-filling curve to decomposition of the computational domain, we make it possible to contain the same number of nodes in each decomposed domain. Our parallel simulation code achieves a good weak scalability on the TSUBAME2.5 supercomputer.

Published
2017

30. Abstracts of the Seventeenth Annual Meeting of the Japanese Society of Biometeorology, Osaka, 21–22 November 1978

Author

Iriki, M., Kozawa, E., Iguchi, T., Hori, T., Tsuzuki, S., Tsunashima, K., Kubo, K., Kawakami, M., Murakami, N., Tokura, H., Suzuki, T., Yoshimura, C., Tsurutani, T., Ogawa, T., Ito, M., Miyagawa, T., Asayama, M., Nagasaka, T., Hirata, K., Sugano, Y., Shibata, H., Mohri, M., Sasaki, T., Chiba, Y., Osada, H., Sakaguchi, E., Yurugi, R., Yamaoka, S., Hiroshige, T., Honma, K., Itoh, S., Hirokawa, Y., Horie, G., Nakamura, S., Tsukamoto, N., Watanabe, M., Sohn, J. Y., Isoda, N., Kobayashi, Y., Yamaguchi, K., Nishimura, K., Kawashima, Y., Gotoh, S., Watanabe, T., Matsumoto, Y., Kawahara, Y., Hoshiai, T., Minamino, O., Ota, K., Inoue, T., Naruse, T., Kajii, H., Inaba, K., Miyano, A., Kamiyama, K., Kito, K., Nemoto, O., Horikoshi, T., Namihira, G., Saiki, H., Saiki, M., Nakaya, M., Sudoh, M., Abe, M., Nakahara, H., Yokoyama, H., Ohara, K., Okuda, N., Kuroshima, A., Kurahashi, M., Yahata, T., Doi, K., Ohno, T., Agishi, Y., Moriya, K., Yamaguchi, T., Ueda, G., Takeoka, M., Koshihara, Y., Tanaka, N., Tsujita, J., Mayuzumi, M., Itoh, K. B., Hori, S., Nakamura, M., Yukawa, K., Hirata, H., Ikeda, T., Ishihara, U., Morimoto, T., Miki, K., Shiraki, K., Niwa, K., Ohnuki, Y., Nakayama, T., Igawa, S., Yorimoto, A., Kita, H., Hanawa, K., Sugiyama, M., Iwami, K., Hayashi, O., Fujita, K., Kikuchi, M., Matsushita, K., Tsujino, A., Araki, T., Toda, Y., Tochihara, T., Ohnaka, T., Matsui, J., Tanaka, M., Yoshida, K., Yokoi, T., Yanaga, T., Kaji, M., Sato, T., Momiyama, M. S., Fujii, Y., Murakami, M., Ichimaru, Y., Yoshiyama, T., Asahina, K., Watanabe, K., Sekiguchi, N., Matsumoto, T., Mori, K., Yano, T., Katayama, K., Shimura, M., and Miura, T.

Published
1981
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31. Abstracts of the Twenty-Fourth Annual Meeting of the Japanese Society of Biometeorology, Tsukuba, 2–3 December, 1985

Author

Yoshino, M., Kawamura, T., Park, H., Kezuka (Kawamura), M., Fukuoka, Y., Kuraishi, S., Asoh, T., Tsuji, H., Shirasaka, C., Uchida, I., Masuda, Y., Moriguchi, S., Noguchi, S., Tanaka, N., Senga, Y., Yamada, K., Hori, S., Ogawa, K., Ohno, T., Kuroshima, A., Makino, K., Inaba, Y., Kikuchi, M., Tanaka, H., Kanosue, K., Nakayama, T., Furuyama, F., Ohara, K., Tomita, T., Hori, T., Shibata, M., Kiyohara, T., Nakashima, T., Kubo, K., Tsuzuki, S., Sasaki, T., Tsuchiya, K., Ye-Win, Ohwatari, N., Fujiwara, M., Kosaka, M., Murakami, N., Yahata, T., Murazumi, K., Habara, Y., Tuchikawa, T., Horikoshi, T., Kobayashi, Y., Kurazumi, Y., Hirayama, K., Miwa, E., Tsuchikawa, T., Nishi, Y., Suzuki, K., Oohori, T., Kashimura, O., Shimura, M., Miura, T., Egashira, K., Suzuki, T., Abe, K., Ogata, T., Nonaka, K., Yanagidaira, Y., Ueda, G., Takeoka, M., Sawada, S., Asayama, M., Onishi, N., Ymatshita, Y., Suagenoya, J., Ogawa, T., Nagai, M., Iriki, M., Isobe, Y., Ohnishi, N., Sugenoya, J., Yamashita, Y., Miyagawa, T., Iwamoto, J., Fan, Ye -Jen, Ohnuki, Y., Niwa, K., Ajiki, I., Araki, Y., Miyamoto, M., Nakamura, I., Miyazaki, Y., Takano, T., and Kajii, H.

Published
1987
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32. Abstracts of the Twenty-Third Annual Meeting of the Japanese society of Biometeorology, Nagakute, 30 November–1 December 1984

Author

Mohri, M., Ohno, H., Yahata, T., Kuroshima, A., Doi, R., Asoh, T., Tsuji, H., Shirasaka, C., Takeuchi, Y., Uchida, I., Noguchi, S., Shirakura, T., Sugai, Y., Tsuchiya, K., Fan, Y. J., Kosaka, M., Ohwatwri, N., Fujiwara, M., Iwamoto, J., Shido, O., Nagasaka, T., Sawada, S., Sugano, Y., Niwa, K., Nakayama, T., Tanaka, H., Uchino, K., Kawashima, Y., Ohira, M., Watanabe, F., Kimotuki, K., Watanabe, A., Hattori, M., Hayashi, O., Aoki, N., Shimura, A., Kikuchi, M., Fukuoka, Y., Nose, H., Morita, M., Yawata, T., Morimoto, T., Yasuda, Y., Ohara, K., Konda, N., Sagawa, S., Shiraki, K., Horikoshi, T., Tsuchikawa, T., Kobayashi, Y., Kagawa, S., Shinagawa, N., Yajima, M., Someya, K., Kamide, M., Okabe, N., Tanaka, N., Hori, S., Yamada, K., Senga, Y., Yamaoka, S., Sugenoya, J., Ogawa, T., Asayama, M., Miyagawa, T., Yamashita, Y., Ohnishi, N., Hirayama, K., Kurazumi, Y., Fukushima, S., Makino, K., Inaba, Y., Momiyama, M. S., Katayama, K., Shimura, M., Nonaka, K., Miura, T., Kiyohara, T., Hori, T., Shibata, M., Nakashima, T., Yamasaki, M., Tsuzuki, S., Kubo, K., Sasaki, T., Murakami, N., Ohnuki, Y., Ishikawa, Y., Nagai, M., Iriki, M., Ueda, G., Takeoka, M., Sakai, A., Kobayashi, T., Fukushima, M., Yoshimura, K., and Saitoh, T.

Published
1986
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33. Abstracts of the Twenty-second Annual Meeting of the Japanese Society of Biometeorology, Kanazawa, 28–29 October 1983

Author

Hirose, F., Tokura, H., Shibuya, I., Tamura, M., Doi, K., Isobe, Y., Hasegawa, Y., Ohara, K., Ueda, G., Sakai, A., Kobayashi, T., Kubo, K., Fukushima, M., Yoshimura, K., Shibamoto, T., Yasaki, K., Ohyabu, Y., Nishibayashi, Y., Honda, Y., Tsujita, J., Hori, S., Watanuki, M., Miyatani, S., Kajiwara, N., Sasaki, T., Hayashi, O., Aoki, N., Shimura, A., Kikuchi, M., Yamamoto, S., Sawada, S., Yasukouchi, A., Nose, N., Morimoto, T., Ogura, K., Takeoka, M., Koshihara, Y., Sudo, A., Kuroshima, A., Habara, Y., Uehara, A., Murazumi, K., Yahata, T., Ohno, T., Mohri, M., Tanaka, M., Matsui, J., Yamazaki, S., Tochihara, Y., Ohnaka, T., Yoshida, K., Nishi, Y., Mochida, T., Yokoyama, S., Ogino, H., Nonaka, K., Shimura, M., Miura, T., Hanawa, K., Yorimoto, A., Igawa, S., Kita, H., Horie, G., Sakurai, Y., Noguchi, T., Matsubara, N., Okamoto, S., Satoh, S., Yamashita, Y., Kawamura, M., Nakajima, T., Sugai, K., Tsuzuki, S., Imai-Matsumura, K., Nakayama, T., Ishikawa, Y., Tanaka, H., Kanosue, K., Ohnuki, Y., Matsumura, K., Ohnuki, Y., Shibata, M., Hori, T., Kiyohara, T., Nakashima, T., Murakami, N., Simon-Oppermann, Ch., Gray, D. A., Simon, E., Furuyama, F., Ogawa, T., Miyagawa, T., Asayama, M., Terai, Y., Sugenoya, J., Ohnishi, N., Fujimatsu, H., Niwa, K., Kosaka, M., Ohwatari, N., Fujiwara, M., and Tsuchiya, K.

Published
1985
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34. Abstracts of the Twenty-First Annual Meeting of the Japanese Society of Biometeorology, Sapporo, 4–5 October

Author

Hayashi, O., Aoki, N., Shimura, A., Kikuchi, M., Tsuzuki, S., Kubo, K., Sasaki, T., Asayama, M., Fujimatsu, H., Miyagawa, T., Terai, Y., Sugenoya, J., Ogawa, T., Ohnishi, N., Takano, T., Miyazaki, Y., Motohashi, Y., Yasukouchi, A., Iwanaga, K., Koya, Y., Tochihara, Y., Ohnaka, T., Yamazaki, S., Tanaka, M., Yoshida, K., Kashimura, Osamu, Murakami, N., Konda, N., Shiraki, K., Sagawa, S., Igawa, S., Morikawa, T., Kashimura, O., Kita, H., Yamamoto, S., Sudo, A., Sawada, S., Kobayashi, Y., Kawagoe, K., Horie, G., Sakurai, Y., Matsubara, N., Miki, K., Morimoto, T., Nose, H., Ito, T., Yamada, S., Sakai, A., Ueda, G., Yasaki, K., Shibamoto, T., Yoshimura, K., Fukushima, M., Kobayashi, T., Ohwatari, N., Fujiwara, M., Tsuchiya, K., Kosaka, M., Sakaguchi, E., Osada, H., Sakaguchi, T., Yurugi, R., Yanagidaira, Y., Takeoka, M., Koshihara, Y., Tsujita, J., Tohori, M., Tanaka, N., Hori, S., Araki, T., Fujimatu, H., Sugano, Y., Nagasaka, T., Nunomura, T., Ohmae, O., Shibata, H., Tsurutani-Midorikawa, T., Niwa, K., Nakayama, T. T., Horikoshi, T., Mochida, T., Yokoyama, S., Ogino, H., Hori, T., Kiyohara, T., Shibara, M., Nakashima, T., Ohnuki, Y., Ishikawa, Y., Nakayama, T., Isobe, Y., Kimura, T., Shimura, M., Miura, T., Momiyama, M., Nakamura, Y., Yamasaki, M., Yamaoka, S., Ishigure, K., Nagata, H., Doi, K., Kuroshima, A., Inomoto, T., Yazaki, K., and Mohri, M.

Published
1984
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40. Orbital apex syndrome on initial presentation of giant cell arteritis: a case report and review of the literature.

Author

Tsuzuki, S, Tsuchiya, H, Shoda, H, and Fujio, K

Subjects
*GIANT cell arteritis, *SYNDROMES, *CONTRAST-enhanced magnetic resonance imaging, *MULTINUCLEATED giant cells, *SENSORY disorders, *LITERATURE reviews
Abstract

Giant cell arteritis (GCA) is an inflammatory vascular syndrome that is characterized by cranial and/or large vessel vasculitis, causing stenoses and aneurysms of affected vessels ([1]). We report our experience with a GCA patient with visual deterioration due to orbital apex syndrome, a rare complication of GCA. Presumably, GCA with orbital apex syndrome is included in the latter group; the pathological findings would differ from GCA with PMR. [Extracted from the article]

Published
2022
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41. Detection of THz radiation by using GaAs in Cherenkov-phase-matched electro-optic sampling

Author

Ozawa, S., primary, Nagase, T., additional, Tsuzuki, S., additional, Takeshima, D., additional, Furuya, T., additional, Nishizawa, S., additional, Kurihara, K., additional, Kuwashima, F., additional, de los Santos, R., additional, Somintac, A., additional, Estacio, E., additional, Yamamoto, K., additional, Bakunov, M., additional, and Tani, M., additional

Published
2013
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