Faculty Profiles - SAKAMOTO Shin-ichi

Papers - SAKAMOTO Shin-ichi

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The Effect of Wearing Elastic Compression Stockings on Leg Edema in Pregnant Women in Late Pregnancy as Determined by Measuring the Deep Venous Velocity and Flow”

Healthcare 2025

Effect of relay tube geometry on the onset temperature in loop-tube thermoacoustic systems Reviewed

Shin-ichi Sakamoto, Satoru Ono , and Satoshi Hirayama

Jpn. J. Appl. Phys 2025

Fundamental study for heat pump stack length determination with complex flow paths in a compact thermoacoustic system Reviewed

Satoru Ono, Shin-ichi Sakamoto

Jpn. J. Appl. Phys 2023

An approach to low-temperature oscillation and high efficiency of thermoacoustic prime mover: influence of end face and reduction area of phase adjuster Reviewed

Takumi Matsumoto, Shin-ichi Sakamoto

Jpn. J. Appl. Phys 2023

A Histogram Analysis of the Pixel Grayscale (Luminous Intensity) of B-Mode Ultrasound Images of the Subcutaneous Layer Predicts the Grade of Leg Edema in Pregnant Women.

2023

Measurement of Skin Thickness Using Ultrasonography to Test the Usefulness of Elastic Compression Stockings for Leg Edema in Pregnant Women Reviewed

Banba A., Koshiyama M., Watanabe Y., Makino K., Ikuta E., Yanagisawa N., Ono A., Nakagawa M., Seki K., Sakamoto S.I., Hara Y., Nakajima A.

Healthcare (Switzerland) 10 ( 9 ) 2022.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Healthcare (Switzerland)

Background: One of the most common treatments for leg edema during pregnancy is the use of compression stockings. The purpose of this study was to evaluate the objective effectiveness in pregnant women, by measuring the changes of skin thickness using ultrasonography. Methods: Pregnant women were diagnosed with leg edema using the pitting edema method at 36 weeks of gestation. Twenty-four pregnant women (48 legs) with leg edema spent time without wearing elastic stockings at 36–37 weeks of gestation. Then, they wore elastic stockings for one week at 37–38 weeks of gestation. We measured the grade of edema (from 0 to 3) and the skin thickness of the lower leg by portable ultrasonography at 36, 37, and 38 weeks of gestation (a before-and-after study). Results: In 24 pregnant women, thigh edema was not detected in any of the 48 legs before or after the use of elastic stockings. All 48 legs in 24 pregnant women had physiological lower leg edema, but not thigh edema. The average grade of pitting edema in each lower leg significantly decreased after using the stockings (36 weeks, 1.77 ± 0.85; 37 weeks, 1.79 ± 0.77; 38 weeks, 1.04 ± 0.74, p < 0.0001). In addition, the skin thickness of the lower legs was significantly decreased after the use of elastic stockings (36 weeks, 7.47 ± 2.45 mm; 37 weeks, 7.93 ± 2.83 mm; 38 weeks, 7.15 ± 2.35 mm, p < 0.0001). Conclusions: The wearing of elastic compression stockings on the lower legs is objectively effective for improving leg edema in pregnant women.

DOI： 10.3390/healthcare10091754

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85138549973&origin=inward

Study of the reduction of the onset temperature in a loop-tube-type thermoacoustic prime mover using conical phase adjuster. - Based study on the installation position and onset temperature of conical phase adjuster -” Reviewed

Takumi Matsumoto, Shin-ichi Sakamoto

Jpn. J. Appl. Phys 2022

Basic study for the quantitative diagnosis of edema focusing on ultrasound propagation time waveform information. Reviewed International journal

Sakamoto S, Godo T, Koshiyama M, Ikuta E, Watanabe Y.

Women’s Health open journal 2022

Classifying dysphagic swallowing sounds with support vector machines Reviewed

Miyagi S., Sugiyama S., Kozawa K., Moritani S., Sakamoto S.I., Sakai O.

Healthcare (Switzerland) 8 ( 2 ) 2020.6

Language：English Publishing type：Research paper (scientific journal) Publisher：Healthcare (Switzerland)

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.

DOI： 10.3390/healthcare8020103

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85088588517&origin=inward

Measurement of Women’s Leg Edema Using Ultrasonography Reviewed

Eri Ikuta, Yumiko Watanabe, Nami, Yanagisawa, Miwa Nakagawa, Ayumi Ono, Keiko Seki, Makiko Oowaki, Masafumi Koshiyama, and Shin-ichi Sakamoto

Women Health Open J. 2020.6

A quantitative method to measure skin thickness in leg edema in pregnant women using B-scan portable ultrasonography: A comparison between obese and non-obese women Reviewed

Yanagisawa N., Koshiyama M., Watanabe Y., Sato S., Sakamoto S.

Medical Science Monitor 25 1 - 9 2019.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Medical Science Monitor

© 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.

DOI： 10.12659/MSM.911799

Scopus

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85059284479&origin=inward

Detection of Swallowing Times Using a Commercial RGB-D Camera Reviewed International journal

Jun Yoshida, Keiko Kozawa, Sueyoshi Moritani, Shin-ichi Sakamoto, Osamu Sakai, Shigeyuki Miyagi

Proceedings of 2019 IEEE 8th Global Conference on Consumer Electronics 2019

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- Reviewed

小清水孝夫，坂本眞一

Thermal Science & Engineering 2019

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― Reviewed

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 2014.8

Fabrication and characterization of Cu2O, ZnO and ITO thin films toward oxide thin film solar cell by mist chemical vapor deposition method Reviewed

Takumi Ikenoue, Shin-ichi Sakamoto and Yoshitaka Inui

Physica Status Solidi 11 ( 7-8 ) 1237 - 1239 2014.7

Numerical analysis of the effect of local diameter reduction on the critical temperature of thermoacoustic oscillations in a looped tube Reviewed

Yuichiro Orino, Shin-ichi Sakamoto, Yoshitaka Inui, Takumi Ikenoue and Yoshiaki Watanabe

Jpn. J. Appl. Phys 5307KE13 2014.7

Fabrication and characteristics of p-type Cu2O thin films by ultrasonic spray-assisted mist CVD method Reviewed

Takumi Ikenoue, Shin-ichi Sakamoto, and Yoshitaka Inui

Japanese Journal of Applied Physics 53 ( 5S1 ) - - - 2014.5

Fundamental Study of a Loop-Tube-Type Thermoacoustic Heating System Reviewed

S. Sakamoto, and Y. Watanabe

Journal of Energy and Power Engineering 2096 - 2099 2013.11

Multistage Stack with Multiple Pore Radii Applying the Temperature Gradient to a Thermoacoustic Engine Reviewed

K. Yanagimoto, S. Sakamoto, Y. Nakano, K Kuroda, and Y. Watanabe

Journal of Energy and Power Engineering 1440 - 1447 2013.8

Relationship between Quality Value and Temperature Ratio for Step-Shape Thermoacoustic System", Reviewed

K. Shibata, S. Sakamoto, Y. Nakano, and Y. Watanabe,

Jpn. J. Appl. Phy. ( 07HE06 ) 2013.7

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Papers - SAKAMOTO Shin-ichi