著者

齋藤 俊輝 町田 好男 宮本 宏太 一関 雄輝

出版者

公益社団法人 日本放射線技術学会

雑誌

日本放射線技術学会雑誌 (ISSN:03694305)

巻号頁・発行日

vol.71, no.11, pp.1080-1089, 2015 (Released:2015-11-20)

参考文献数

12

被引用文献数

4 2

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As an acceleration technique for use with magnetic resonance imaging (MRI), compressed sensing MRI (CSMRI) was introduced recently to obtain MR images from undersampled k-space data. Images generated using a nonlinear iterative procedure based on sophisticated theory in informatics using data sparsity have complicated characteristics. Therefore, the factors affecting image quality (IQ) in CS-MRI must be elucidated. This article specifically describes the examination of the IQ of clinically important MR angiography (MRA). For MRA, the depictability of thin blood vessels is extremely important, but quantitative evaluation of thin blood vessel depictability is difficult. Therefore, we conducted numerical experiments using a simple numerical phantom model mimicking the cerebral arteries so that the experimental conditions, including the thin vessel positions, can be given. Results show that vessel depictability changed depending on the noise intensity when the wavelet transform was used as the sparsifying transform. Decreased vessel depictability might present difficulties at the clinical signal-to-noise ratio (SNR) level. Therefore, selecting data acquisition and reconstruction conditions carefully in terms of the SNR is crucially important for CS-MRI study.

著者

宮本 宏史

出版者

大阪体育大学

雑誌

大阪体育大学紀要 (ISSN:02891190)

巻号頁・発行日

vol.33, pp.100-102, 2002-07-01

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The purpose of this study is to analyze the validity of a segment variable of watching-a-game experience that crosses to now from the past called the "existing spectator", the "returned spectator", and the "new spectator" paying attention to marketing segmentation theory and the marketing strategy to each segment. In order to clarify the characteristic of each segment, the investigation in questionnaire for the fans of Vissel Kobe which belongs to J-1 League was conducted in the Univer-Memorial Stadium, and a large difference among the segments was looked at demographics, Psychological Commitment to Team (Mahony et al, 2000), Re-watching-a-game intention (Wakefield and Sloan, 1996), the Social Psychological Factor (Nakazawa et al, 2001) as a result of investigation. For example "existing spectator" showed higher score in the Psychological Commitment to Team and Re-watching-a-game intention than other segments. And "existing spectator" showed high score in "Team Preference" of the Social Psychological Factor, and other segments showed high score in "Player Preference". "existing spectator" is interested in things about Team, and other segments are interested in things about Player. From these results, the validity as a segment variable of watching-a-game and the necessity of taking a suitable marketing strategy for every segment was suggested.

著者

井上 勝一 中島 収 宮本 宏 川上 義和 伊藤 正美

出版者

日本肺癌学会

雑誌

肺癌 (ISSN:03869628)

巻号頁・発行日

vol.30, no.4, pp.513-520, 1990-08-20

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赤血球亜鉛量と血清亜鉛量を64例の肺癌患者で測定し, 以下の結果を得た.1)進行肺癌患者では健康成人に比し血清亜鉛量は低下し, 赤血球球亜鉛量は増加した.2)しかし, 炭酸脱水素酵素量に差はなかった.3)進行肺癌患者の赤血球をヘパリン加生食で洗浄すると, 赤血球亜鉛量の約1%の亜鉛の遊離を認めた.4)以上より, 進行肺癌患者では亜鉛の赤血球への集積が見られ, 担癌生体の亜鉛の動態に多大な影響を示すものと考えられた.

著者

一関 雄輝 宮本 宏太 齋藤 俊輝 森 一生 町田 好男

出版者

日本医用画像工学会

雑誌

Medical Imaging Technology (ISSN:0288450X)

巻号頁・発行日

vol.33, no.5, pp.217-222, 2015 (Released:2015-11-27)

参考文献数

17

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われわれはこれまでプロペラ法を中心にMR画像のノイズパワースペクトル(NPS)計測の検討を行い,その二次元NPSはサンプリング密度を反映し,k空間軌跡どおりの周波数分布を示すことを報告してきた.一方,X線イメージング領域では,扱いも容易で数値解析がしやすい一次元NPSが使われることも多い.そこで本研究では,2つの代表的な一次元NPS計測法を用いて,プロペラMR画像の一次元NPSを検討した.「円周平均法」から求めた一次元NPSは,二次元NPSの同一空間周波数域のNPS値を平均化した特性を示し,「仮想スリット法」から求めた一次元NPSは,スリット走査方向のみのNPS値の周波数特性を表していた.また,NPS値の計測精度について検討を行い,円周平均法では低周波領域で計測精度が低いが,仮想スリット法と比較して精度のよい一次元NPS計測が可能であることがわかった.

著者

坂田 博 宮本 宏彰 杉本 健二 菊池 和彦 磯村 滋宏 正田 英介

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.113, no.6, pp.728-734, 1993

被引用文献数

1

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Recent development in power electronics has made power semiconductor device larger and complicated, and device simulation is necessary to predict their characteristics. From the fundamental equations of semiconductor device, potential distribution and carrier concentrations can be solved using the finite element method. In this study, we make formulation for one dimensional analysis of a gate turn off thyristor (GTO) and simulate switching characteristics in order to know the effects of snubber circuit. In conclusion snubber condensor is necessary to suppress spike voltage, but increases the turn off loss of GTO.