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542 results on '"Kobayashi, Kentaro"'

1. StatWhy: Formal Verification Tool for Statistical Hypothesis Testing Programs

Author

Kawamoto, Yusuke, Kobayashi, Kentaro, and Suenaga, Kohei

Subjects
Computer Science - Software Engineering, Computer Science - Artificial Intelligence
Abstract

Statistical methods have been widely misused and misinterpreted in various scientific fields, raising significant concerns about the integrity of scientific research. To develop techniques to mitigate this problem, we propose a new method for formally specifying and automatically verifying the correctness of statistical programs. In this method, programmers are reminded to check the requirements for statistical methods by annotating their source code. Then, a software tool called StatWhy automatically checks whether the programmers have properly specified the requirements for the statistical methods. This tool is implemented using the Why3 platform to verify the correctness of OCaml programs for statistical hypothesis testing. We demonstrate how StatWhy can be used to avoid common errors in a variety of popular hypothesis testing programs.

Published
2024

5. Determination of the Electronic Localized-to-Extended-State Transition Point around the Metal-to-Insulator Transition Region of Fluid Mercury Using the Framework of Multifractal Analysis

Author

Kobayashi, Kentaro, Sekikawa, Takuya, and Maruyama, Kenji

Subjects
Condensed Matter - Materials Science, Condensed Matter - Disordered Systems and Neural Networks
Abstract

The metal-to-insulator transition and the presence of the disorder induced localization of electronic orbitals of fluid mercury (f-Hg) were investigated. The electronic structure of f-Hg was simulated by means of ab initio molecular dynamics. To see the behavior of the simulation size dependency of the electronic orbital, systems with different number of atoms were simulated. The size dependency of the multifractal measure of the electronic orbitals reversed with decreasing the density, which suggests there exists the extended-to-localized-state transition near the metal-to-insulator transition region of f-Hg., Comment: 19 pages, 7 figures

Published
2020
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11. External validation and update of prediction models for unfavorable outcomes in hospitalized patients with COVID-19 in Japan

Author

Yamada, Gen, Hayakawa, Kayoko, Asai, Yusuke, Matsunaga, Nobuaki, Ohtsu, Hiroshi, Hojo, Masayuki, Hashimoto, Masao, Kobayashi, Kentaro, Sasaki, Ryo, Okamoto, Tatsuya, Yanagawa, Yasuaki, Katagiri, Daisuke, Terada, Mari, Suzuki, Michiyo, Sato, Lubna, Miyazato, Yusuke, Ishikane, Masahiro, Morioka, Shinichiro, Saito, Sho, and Ohmagari, Norio

Published
2021
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16. Revealing the evolution of local structures in the formation process of alkaline earth metal cation-containing zeolites from glasses

Author

Hu, Peidong, primary, Deguchi, Makiko, additional, Yamada, Hiroki, additional, Kobayashi, Kentaro, additional, Ohara, Koji, additional, Sukenaga, Sohei, additional, Ando, Mariko, additional, Shibata, Hiroyuki, additional, Machida, Akihiko, additional, Yanaba, Yutaka, additional, Liu, Zhendong, additional, Okubo, Tatsuya, additional, and Wakihara, Toru, additional

Published
2024
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21. Atomic and Electronic Structures on a Mordenite Zeolite

Author

Hosokawa, Shinya, primary, Sato, Hitoshi, additional, Tezuka, Yasuhisa, additional, Adachi, Jun-ichi, additional, Kimura, Koji, additional, Hayashi, Koichi, additional, Kohara, Shinji, additional, Tajiri, Hiroo, additional, Kobayashi, Kentaro, additional, Koura, Akihide, additional, and Shimojo, Fuyuki, additional

Published
2023
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30. Surgical removal of an intracranially migrated acupuncture needle: a case report and literature review

Author

Abe, Daishiro, Hanaoka, Yoshiki, Kobayashi, Kentaro, Kiuchi, Takafumi, Watanabe, Tomofumi, Kobayashi, Sumio, Ogiwara, Toshihiro, and Horiuchi, Tetsuyoshi

Subjects
penetrating injury, vertebral artery injury, acupuncture-related complication, foreign body, intracranial complication
Abstract

Acupuncture is a popular alternative therapy worldwide and is generally safe. However, serious acupuncture-related complications can occur. Intracranial complications caused by a migrated acupuncture needle are extremely rare. Herein we report a surgical case of intracranial acupuncture needle migration and discuss the key technical aspects of the procedure. We additionally performed a review of the relevant literature. A 55-year-old woman presented with migration of a broken acupuncture needle via the posterior cervical skin. Computed tomography (CT) showed that the needle migrated intra- and extradurally via the atlanto-occipital junction. CT angiography revealed that the needle tail was located adjacent to the right distal horizontal loop of the vertebral artery. Meanwhile, the needle tip was positioned in the premedullary cistern adjacent to the medulla oblongata via the right lateral medullary cistern. Emergent surgical removal was conducted. Intradural exploration was required as the needle was not found in the epidural space. The needle penetrated the adventitia of the right intradural vertebral artery. We failed to pull out the needle toward the epidural space. After the needle was completely pulled into the intradural space, it was successfully removed without bleeding complication. Postoperative CT showed no evidence of residual needle fragment. The patient was discharged home without any sequelae. To the best of our knowledge, this is the first case of penetrating vertebral artery injury caused by radiologically confirmed acupuncture needle migration. An intracranially migrated needle should be removed urgently to prevent further migration causing brainstem, cranial nerve, and vessel injuries. The surgical strategy should be selected according to needle location and direction.

Published
2022

33. Semiconductor Detector-Based Scanners for Nuclear Medicine

Author

Takeuchi, Wataru, Suzuki, Atsuro, Ueno, Yuichiro, Shiga, Tohru, Hirata, Kenji, Okamoto, Shozo, Zhao, Songji, Kuge, Yuji, Kubo, Naoki, Kobayashi, Kentaro, Watanabe, Shiro, Kobashi, Keiji, Umegaki, Kikuo, Tamaki, Nagara, Kuge, Yuji, editor, Shiga, Tohru, editor, and Tamaki, Nagara, editor

Published
2016
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39. Actual situation of handling Tokyo 2020 Games-related patients at a designated hospital during COVID-19 pandemic

Author

Kobayashi, Kentaro, Kimura, Akio, Sasaki, Ryo, Hayakawa, Kayoko, Ohmagari, Norio, Sugiura, Yasuo, Sugiyama, Haruhito, and Kokudo, Norihiro

Subjects
Communication, General Medicine
Abstract

In preparation for the Tokyo 2020 Olympic and Paralympic Games, our hospital was responsible for accepting mainly media representatives, marketing partners, and other Games staff. Given that restricting our regular capacity to treat certain groups of patients could potentially result in social losses, to avoid this we made rigorous preparations for the entire hospital to accept Games-related patients. It was rational to set up a single 24-h contact point at the Emergency Department for making the decision on whether to accept the patient or not and for coordinating the patient's medical care. With respect to language support, International Health Care Center staffs were made available as interpreters on weekdays. Multilingual support was available all day via an application run on tablet devices. During a 67-day period, the hospital accepted 31 Games-related patients (mean age 43.4 years, male: female ratio 25:6). Eighteen patients were from Europe, 4 patients each were from North America and Asia, 2 each were from Central America, South America, and Africa, and 1 was from Oceania. The most common cause of visits was COVID-19, but none were severe cases. Other causes were diverse and included moderate and severe conditions. We summarized the challenges and experiences in handling Tokyo 2020 Games-related patients at a designated hospital during the COVID-19 pandemic.

Published
2022

40. Changes in amorphous structure and reaction acceleration during bulk polymerization of methacrylates

Author

Suzuki, Yasuhito, Mishima, Ryutaro, Onozato, Shodai, Tseng, Jo-chi, Hiroi, Satoshi, Kobayashi, Kentaro, Ohara, Koji, and Matsumoto, Akikazu

Abstract

It has long been known that a sudden reaction acceleration (i.e., the Trommsdorff effect) occurs during bulk polymerization of methacrylates. While this effect has been qualitatively explained by an increased macroscopic viscosity and decreased termination rate, the detailed mechanism is still debated. This is because the effect occurs so suddenly that the change in macroscopic viscosity is not sufficient to explain the effect quantitatively. Less attention has been given to the change in the amorphous structure during bulk polymerization. In this study, we investigate the amorphous structure during bulk polymerization of methyl methacrylate (MMA), ethyl methacrylate (EMA), and butyl methacrylate (BMA) via X-ray scattering. The amorphous structure changes dramatically at some point during bulk polymerization. To obtain detailed microscopic information, we applied pair distribution function (PDF) analysis during the bulk polymerization of MMA. Our results suggest that a change in the amorphous structure influences the reaction kinetics during bulk polymerization.

Published
2024
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