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職名 |
准教授 |
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研究分野・キーワード |
超音波エレクトロニクス，熱音響工学 |
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メールアドレス |
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プロフィール |
研究課題（研究概要） |
坂本 眞一 (サカモト シンイチ)
SAKAMOTO Shin-ichi
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論文 【 表示 ／ 非表示 】
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Classifying dysphagic swallowing sounds with support vector machines
Miyagi S., Sugiyama S., Kozawa K., Moritani S., Sakamoto S.I., Sakai O.
Healthcare (Switzerland) Healthcare (Switzerland) 8 (2) 2020年06月
[概要]
Swallowing sounds from cervical auscultation include information related to the swallowing function. Several studies have been conducted on the screening tests of dysphagia. The literature shows a significant difference between the characteristics of swallowing sounds obtained from different subjects (e.g., healthy and dysphagic subjects; young and old adults). These studies demonstrate the usefulness of swallowing sounds during dysphagic screening. However, the degree of classification for dysphagia based on swallowing sounds has not been thoroughly studied. In this study, we investigate the use of machine learning for classifying swallowing sounds into various types, such as normal swallowing or mild, moderate, and severe dysphagia. In particular, swallowing sounds were recorded from patients with dysphagia. Support vector machines (SVMs) were trained using some features extracted from the obtained swallowing sounds. Moreover, the accuracy of the classification of swallowing sounds using the trained SVMs was evaluated via cross-validation techniques. In the two-class scenario, wherein the swallowing sounds were divided into two categories (viz. normal and dysphagic subjects), the maximum F-measure was 78.9%. In the four-class scenario, where the swallowing sounds were divided into four categories (viz. normal subject, and mild, moderate, and severe dysphagic subjects), the F-measure values for the classes were 65.6%, 53.1%, 51.1%, and 37.1%, respectively.
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Measurement of Women’s Leg Edema Using Ultrasonography
Eri Ikuta, Yumiko Watanabe, Nami, Yanagisawa, Miwa Nakagawa, Ayumi Ono, Keiko Seki, Makiko Oowaki, Masafumi Koshiyama, and Shin-ichi Sakamoto
Women Health Open J. 2020年06月
共著
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Yanagisawa N., Koshiyama M., Watanabe Y., Sato S., Sakamoto S.
Medical Science Monitor Medical Science Monitor 25 1 ～ 9 2019年01月
[概要]
© Med Sci Monit, 2019. Background: This study aimed to use a portable ultrasound method to quantitatively measure skin thickness and to compare leg edema in obese and non-obese pregnant women. Material/Methods: Thirty-six pregnant women (17 primiparas and 19 multiparas) at 27/28 and 37/38 weeks of pregnancy, with and without leg edema, had their lower leg skin thickness measured using a B-scan portable ultrasonography device (72 legs and maximum of 98 measurements). Measurements were compared between women who were obese prior to pregnancy, with a body mass index (BMI) ≥25 kg/m 2 and non-obese with a BMI <25 kg/m 2 . Results: Skin thickness of the legs in pregnant women with edema was significantly increased compared with that in pregnant women without edema (6.4±0.3 mm vs. 4.6±0.4 mm) (p=0.0001). There was a significant correlation between the degree of pitting edema and skin thickness in all edematous legs (r=0.56; n=98; p<0.0001). The cutoff level of edema measured by portable ultrasound in non-obese pregnant women was 4.7 mm (sensitivity 83.9%, specificity 66.7%) and was 7.5 mm in obese pregnant women. Obese pregnant women with edema had a significantly increased leg skin thickness compared with non-obese pregnant women with edema (11.3±1.3 mm vs. 5.7±0.2 mm) (p<0.0001). Conclusions: Portable ultrasonography is a reliable method of quantitatively measuring skin thickness of the lower leg in edema associated with pregnancy. The thickness of the skin in obese pregnant women with edema can be expected to be significantly increased compared with non-obese pregnant women with edema.
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Detection of Swallowing Times Using a Commercial RGB-D Camera
Jun Yoshida, Keiko Kozawa, Sueyoshi Moritani, Shin-ichi Sakamoto, Osamu Sakai, Shigeyuki Miyagi
Proceedings of 2019 IEEE 8th Global Conference on Consumer Electronics 2019年
単著
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熱音響デバイスの数値解析におけるスタック温度に対する熱的条件の影響-
小清水孝夫，坂本眞一
Thermal Science & Engineering 2019年
単著
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熱音響システムにおけるPhase Adjusterの音響特性に関する検討 ―直管強制駆動による線形モデルの評価―
折野裕一郎，坂本眞一，乾義尚，池之上卓己，渡辺好章
Acoust. Sci. & Tech 70 (8) 426 ～ 432 2014年08月
共著 共同（副担当）
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Fabrication and characterization of Cu2O, ZnO and ITO thin films toward oxide thin film solar cell by mist chemical vapor deposition method
Takumi Ikenoue, Shin-ichi Sakamoto and Yoshitaka Inui
Physica Status Solidi 11 (7-8) 1237 ～ 1239 2014年07月
10.1002/pssc.201300638 共著 共同（副担当）
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Numerical analysis of the effect of local diameter reduction on the critical temperature of thermoacoustic oscillations in a looped tube
Yuichiro Orino, Shin-ichi Sakamoto, Yoshitaka Inui, Takumi Ikenoue and Yoshiaki Watanabe
Jpn. J. Appl. Phys 5307KE13 ～ 2014年07月
共著 共同（副担当）
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Fabrication and characteristics of p-type Cu2O thin films by ultrasonic spray-assisted mist CVD method
Takumi Ikenoue, Shin-ichi Sakamoto, and Yoshitaka Inui
Japanese Journal of Applied Physics 53 (5S1) - 2014年05月
10.7567/JJAP.53.05FF06 共著 共同（副担当）
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Fundamental Study of a Loop-Tube-Type Thermoacoustic Heating System
S. Sakamoto, and Y. Watanabe
Journal of Energy and Power Engineering 2096 ～ 2099 2013年11月
共著 共同（主担当）
会議での講演 【 表示 ／ 非表示 】
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FDTD法を用いた下肢浮腫における超音波診断に向けた研究ー送信周波数が水と脂肪へ与える影響についての基礎検討ー
日本音響学会2022春季研究発表会 2022年03月
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CPAを用いたループ管型熱音響プライムムーバーのエネルギー変換効率向上に向けた基礎検討ー共鳴モードの影響についてー
日本音響学会2022春季研究発表会 2022年03月
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ループ管熱音響プライムムーバーにおける低温駆動に向けての基礎検討-プライムムーバー断面拡大形状について-
日本音響学会2022春季研究発表会 2022年03月
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金属メッシュ清掃隊を用いたミリオーダースタックがヒートポンプ性能に与える影響
日本音響学会2022春季研究発表会 2022年03月
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Basic study of HPA temperature and onset temperature in thermoacoustic prime mover by stability analysis
第42回超音波エレクトロニクスの基礎と応用に関するシンポジウム 2021年10月
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Fundamental study on the position of CPA in a thermoacoustic prime mover using stability analysis
第42回超音波エレクトロニクスの基礎と応用に関するシンポジウム 2021年10月
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熱音響システムのヒートポンプにおけるスタックの長さに対する基礎検討〜金属メッシュの積層体による実験〜
日本音響学会2021秋季研究発表会 2021年09月
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熱音響システムのエネルギーの有効利用に向けて
日本音響学会2021秋季研究発表会 2021年09月
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下肢浮腫を定量的に測定する超音波装置の開発に向けた試み
第61回日本母性衛生学会学術集会 2020年10月
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「リチウムイオン二次電池の内部インピーダンスの温度依存性に及ぼす劣化の影響の検討」
平成27年電気学会全国大会 2015年03月
