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4,588 results on '"Yamada, Akira"'

1. Prognostic value of combining cardiac myosin-binding protein C and N-terminal pro-B-type natriuretic peptide in patients without acute coronary syndrome treated at medical cardiac intensive care units

Author

Nishimura, Hideto, Ishii, Junnichi, Takahashi, Hiroshi, Ishihara, Yuya, Nakamura, Kazuhiro, Kitagawa, Fumihiko, Sakaguchi, Eirin, Sasaki, Yuko, Kawai, Hideki, Muramatsu, Takashi, Harada, Masahide, Yamada, Akira, Tanizawa-Motoyama, Sadako, Naruse, Hiroyuki, Sarai, Masayoshi, Yanase, Masanobu, Ishii, Hideki, Watanabe, Eiichi, Ozaki, Yukio, and Izawa, Hideo

Published
2024
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6. Oppenheim-Schur's inequality and RKHS

Author

Yamada, Akira

Subjects
Mathematics - Functional Analysis, 15A45 (Primary), 46E22 (Secondary)
Abstract

In 2012, we obtained Oppenheim's inequality for positive semidefinite matrices and its equality condition by the reproducing kernel method. In this paper, as a continuation, we give a reproducing kernel proof of the block matrix version of the Oppenheim-Schur's inequality and its equality condition in the positive definite case.

Published
2024

15. Does the Anchoring Effect Influence Individuals’ Anti-phishing Behavior Intentions?

Author

Sawaya, Yukiko, Sano, Ayane, Isohara, Takamasa, Yamada, Akira, Komatsu, Ayako, 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, Mosbah, Mohamed, editor, Sèdes, Florence, editor, Tawbi, Nadia, editor, Ahmed, Toufik, editor, Boulahia-Cuppens, Nora, editor, and Garcia-Alfaro, Joaquin, editor

Published
2024
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22. From FDG and beyond: the evolving potential of nuclear medicine

Author

Hirata, Kenji, Kamagata, Koji, Ueda, Daiju, Yanagawa, Masahiro, Kawamura, Mariko, Nakaura, Takeshi, Ito, Rintaro, Tatsugami, Fuminari, Matsui, Yusuke, Yamada, Akira, Fushimi, Yasutaka, Nozaki, Taiki, Fujita, Shohei, Fujioka, Tomoyuki, Tsuboyama, Takahiro, Fujima, Noriyuki, and Naganawa, Shinji

Published
2023
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26. Designing a Location Trace Anonymization Contest

Author

Murakami, Takao, Arai, Hiromi, Hamada, Koki, Hatano, Takuma, Iguchi, Makoto, Kikuchi, Hiroaki, Kuromasa, Atsushi, Nakagawa, Hiroshi, Nakamura, Yuichi, Nishiyama, Kenshiro, Nojima, Ryo, Oguri, Hidenobu, Watanabe, Chiemi, Yamada, Akira, Yamaguchi, Takayasu, and Yamaoka, Yuji

Subjects
Computer Science - Cryptography and Security, Computer Science - Databases
Abstract

For a better understanding of anonymization methods for location traces, we have designed and held a location trace anonymization contest that deals with a long trace (400 events per user) and fine-grained locations (1024 regions). In our contest, each team anonymizes her original traces, and then the other teams perform privacy attacks against the anonymized traces. In other words, both defense and attack compete together, which is close to what happens in real life. Prior to our contest, we show that re-identification alone is insufficient as a privacy risk and that trace inference should be added as an additional risk. Specifically, we show an example of anonymization that is perfectly secure against re-identification and is not secure against trace inference. Based on this, our contest evaluates both the re-identification risk and trace inference risk and analyzes their relationship. Through our contest, we show several findings in a situation where both defense and attack compete together. In particular, we show that an anonymization method secure against trace inference is also secure against re-identification under the presence of appropriate pseudonymization. We also report defense and attack algorithms that won first place, and analyze the utility of anonymized traces submitted by teams in various applications such as POI recommendation and geo-data analysis., Comment: Accepted at PoPETs (Proceedings on Privacy Enhancing Technologies) 2023

Published
2021

30. Clinical applications of artificial intelligence in liver imaging

Author

Yamada, Akira, Kamagata, Koji, Hirata, Kenji, Ito, Rintaro, Nakaura, Takeshi, Ueda, Daiju, Fujita, Shohei, Fushimi, Yasutaka, Fujima, Noriyuki, Matsui, Yusuke, Tatsugami, Fuminari, Nozaki, Taiki, Fujioka, Tomoyuki, Yanagawa, Masahiro, Tsuboyama, Takahiro, Kawamura, Mariko, and Naganawa, Shinji

Published
2023
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32. Efficacy of azilsartan on left ventricular diastolic dysfunction compared with candesartan: J-TASTE randomized controlled trial

Author

Ito, Shin, Takahama, Hiroyuki, Asakura, Masanori, Abe, Yukio, Ajioka, Masayoshi, Anzai, Toshihisa, Arikawa, Takuo, Hayashi, Takaharu, Higashino, Yorihiko, Hiramitsu, Shinya, Iwahashi, Noriaki, Izumi, Chisato, Kimura, Kazuo, Kinugawa, Koichiro, Kioka, Hidetaka, Lim, Young-Jae, Matsuoka, Ken, Matsuoka, Satoshi, Motoki, Hirohiko, Nakamura, Sunao, Nakayama, Takafumi, Nomura, Akihiro, Sasaoka, Taishi, Takiuchi, Shin, Toyoda, Shigeru, Ueda, Tomoya, Watanabe, Tetsuya, Yamada, Akira, Yamamoto, Masayoshi, Sozu, Takashi, and Kitakaze, Masafumi

Published
2023
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36. Influences of Human Demographics, Brand Familiarity and Security Backgrounds on Homograph Recognition

Author

Thao, Tran Phuong, Sawaya, Yukiko, Nguyen-Son, Hoang-Quoc, Yamada, Akira, Kubota, Ayumu, Van Sang, Tran, and Yamaguchi, Rie Shigetomi

Subjects
Computer Science - Cryptography and Security
Abstract

Homograph attack is a way that attackers deceive victims about which website domain name they are communicating with by exploiting the fact that many characters look alike. The attack becomes serious and is raising broad attention when recently many brand domains have been attacked such as Apple Inc., Adobe Inc., Lloyds Bank, etc. We first design a survey of human demographics, brand familiarity, and security backgrounds and apply it to 2,067 participants. We build a regression model to study which factors affect participants' ability in recognizing homograph domains. We find that for different levels of visual similarity, the participants exhibit different abilities. 13.95% of participants can recognize non-homographs while 16.60% of participants can recognize homographs whose the visual similarity with the target brand domains is under 99.9%; but when the similarity increases to 99.9%, the number of participants who can recognize homographs significantly drops down to only 0.19%; and for the homographs with 100% of visual similarity, there is no way for the participants to recognize. We also find that female participants tend to recognize homographs better the male but male participants tend to able to recognize non-homographs better than females. Security knowledge is a significant factor affecting both homographs and non-homographs; surprisingly, people who have strong security knowledge tend to be able to recognize homographs but not non-homographs. Furthermore, people who work or are educated in computer science or computer engineering do not appear as a factor affecting the ability in recognizing homographs; however, interestingly, right after they are explained about the homograph attack, people who work or are educated in computer science or computer engineering are the ones who can capture the situation the most quickly.

Published
2019

37. Superconductivity in Cage Compounds La$Tr_{2}$Al$_{20}$ with $Tr$ = Ti, V, Nb, and Ta

Author

Yamada, Akira, Higashinaka, Ryuji, Matsuda, Tatsuma D., and Aoki, Yuji

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons
Abstract

Electrical resistivity, magnetic susceptibility, and specific heat measurements on single crystals of La$Tr_{2}$Al$_{20}$ ($Tr$ = Ti, V, Nb, and Ta) revealed that these four compounds exhibit weak-coupling superconductivity with transition temperatures $T_{\rm c}$ = 0.46, 0.15, 1.05, and 1.03 K, respectively. LaTi$_{2}$Al$_{20}$ is most probably a type-I superconductor, which is quite rare among intermetallic compounds. Single-crystal X-ray diffraction suggests "rattling" anharmonic large-amplitude oscillations of Al ions (16$c$ site) on the Al$_{16}$ cage, while no such feature is suggested for the cage-center La ion. Using a parameter $d_{\rm GFS}$ quantifying the "guest free space" of the cage-center ion, we demonstrate that nonmagnetic $RTr_{2}$Al$_{20}$ superconductors are classified into two groups, i.e., (A) $d_{\rm GFS} \ne 0$ and $T_{\rm c}$ correlates with $d_{\rm GFS}$, and (B) $d_{\rm GFS} \simeq 0$ and $T_{\rm c}$ seems to be governed by other factors., Comment: 5 pages, 5 figures. To appear in J. Phys. Soc. Jpn

Published
2018
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41. SnAs-based layered superconductor NaSn2As2

Author

Goto, Yosuke, Yamada, Akira, Matsuda, Tatsuma D., Aoki, Yuji, and Mizuguchi, Yoshikazu

Subjects
Condensed Matter - Superconductivity
Abstract

Superconductivity with exotic properties has often been discovered in materials with a layered (two-dimensional) crystal structure. The low dimensionality affects the electronic structure of materials, which could realize a high transition temperature (Tc) and/or unconventional pairing mechanisms. Here, we report the superconductivity in a layered tin arsenide NaSn2As2. The crystal structure consists of (Sn2As2)2- bilayers, which is bound by van-der-Waals forces, separated by Na+ ions. Measurements of electrical resistivity and specific heat confirm the bulk nature of superconductivity of NaSn2As2 with Tc of 1.3 K. Our results propose that the SnAs layers will be a basic structure providing another universality class of a layered superconducting family, and it provides a new platform for the physics and chemistry of low-dimensional superconductors with lone pair electrons., Comment: 12 pages, 1 table, 3 figures

Published
2017
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42. Low Curie-temperature ferromagnetic phase in SmPt2Cd20 possibly accompanied by strong quantum fluctuations

Author

Yamada, Akira, Oike, Shota, Higashinaka, Ryuji, Matsuda, Tatsuma D., and Aoki, Yuji

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Electrical resistivity, magnetization and specific heat have been measured for single crystals of SmPt$_{2}$Cd$_{20}$. It has been found that SmPt$_{2}$Cd$_{20}$ exhibits a ferromagnetic (FM) transition at $T_{\rm C} = 0.64$ K, the lowest among cubic compounds. Specific heat divided by temperature increases with decreasing temperature even below $T_{\rm C}$ and attains 4.5 J/mol K$^{2}$ at 0.26 K, implying substantial magnetic quantum fluctuations. An analysis of the magnetic entropy suggests the crystalline-electric-field splitting of the Sm $J = 5/2$ multiplet with a $\Gamma_{7}$ doublet ground state and a $\Gamma_8$ quartet excited state (the excitation energy of $\sim30$ K). The electrical resistivity shows a power-law behavior with $T^{0.74}$ below 2 K without showing any noticeable anomaly at $T_{\rm C}$. SmPt$_{2}$Cd$_{20}$ is regarded as a rare cubic system that is located in the vicinity of a FM quantum critical point.

Published
2017
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43. Tumor‐derived mitochondrial formyl peptides suppress tumor immunity through modification of the tumor microenvironment.

Author

Waki, Kayoko, Ozawa, Miyako, Ohta, Keisuke, Komatsu, Nobukazu, and Yamada, Akira

Abstract

Mitochondrial N‐formylpeptides are released from damaged or dead cells to the extracellular spaces and cause inflammatory responses. The role of mitochondrial N‐formylpeptides in aseptic systemic inflammatory response syndromes induced by trauma or cardiac surgery has been well investigated. However, there are no reports regarding the role of mitochondrial N‐formylpeptides in cancer. In this study, we investigated the role of tumor cell‐derived mitochondrial N‐formylpeptides in anti‐tumor immunity using knockout murine tumor cells of mitochondrial methionyl‐tRNA formyltransferase (MTFMT), which catalyze N‐formylation of mitochondrial DNA‐encoded proteins. There was no apparent difference among the wild‐type and MTFMT‐knockout clones of E.G7‐OVA cells with respect to morphology, mitochondrial dynamics, glycolysis and oxidative phosphorylation, oxygen consumption rate, or in vitro cell growth. In contrast, in vivo tumor growth of MTFMT‐knockout cells was slower than that of wild‐type cells. A reduced number of myeloid‐derived suppressor cells and an increase of cytotoxic T‐lymphocytes in the tumor tissues were observed in the MTFMT‐knockout tumors. These results suggested that tumor cell‐derived mitochondrial N‐formylpeptides had a negative role in the host anti‐tumor immunity through modification of the tumor microenvironment. [ABSTRACT FROM AUTHOR]

Published
2024
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44. SeBeST: Security Behavior Stage Model and Its Application to OS Update

Author

Sano, Ayane, Sawaya, Yukiko, Yamada, Akira, Kubota, Ayumu, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Barolli, Leonard, editor, Woungang, Isaac, editor, and Enokido, Tomoya, editor

Published
2021
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49. Human Factors in Homograph Attack Recognition

Author

Thao, Tran Phuong, Sawaya, Yukiko, Nguyen-Son, Hoang-Quoc, Yamada, Akira, Kubota, Ayumu, Van Sang, Tran, Yamaguchi, Rie Shigetomi, 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, Conti, Mauro, editor, Zhou, Jianying, editor, Casalicchio, Emiliano, editor, and Spognardi, Angelo, editor

Published
2020
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50. Detecting Malicious Websites by Query Templates

Author

Kaneko, Satomi, Yamada, Akira, Sawaya, Yukiko, Thao, Tran Phuong, Kubota, Ayumu, Omote, Kazumasa, 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, Simion, Emil, editor, and Géraud-Stewart, Rémi, editor

Published
2020
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