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

Introduction of conical phase adjuster for thermoacoustic system

S. Sakamoto, M. Inoue, Y. Nakano, Y. Orino, Y. Inui, T. Ikenoue, and Y. Watanabe

International Conference on Acoustics 2013 2013.6

Study on thermoacoustic system to drive by low temperature -Effects of loop-tube thermoacoustic system connected with parallel double stacks on the onset temperature ratio

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

International Conference on Acoustics 2013 2013.6

The effect of resonance mode control by expanding of cross-section area on cooling capacity in a loop-tube type thermoacoustic cooling system

M. Inoue, S. Sakamoto, Y. Nakano, and Y. Watanabe,

International Conference on Acoustics 2013 2013.6

Fundamental study for the solution of thermoacoustic phenomenon using numerical calculation - Relation between the stack installation position and heat flow - Reviewed

K. Kuroda, S. Sakamoto, K. Shibata, Y. Nakano, T. Tsuchiya, and Y. Watanabe,

Jpn. J. Appl. Phy. ( 07GE01 ) 2012.7

Relation between Acoustic Impedance and Sound Intensity Amplification in a Stack of Standing-Wave Thermoacoustic Prime Mover Reviewed

K. Sahashi, S. Sakamoto, K. Kuroda, and Y. Watanabe

Jpn. J. Appl. Phy. ( 07GE02 ) 2012.7

Long-Term Drive in Loop-Tube Using Solar Heat Energy-Basic Study for Practical Use of Thermoacoustic Cooling System- Reviewed

Y. Kitadani, S. Sakamoto, K. Sahashi, S. Komiya, and Y. Watanabe

J Journal of Power and Energy Systems 6 ( 1 ) 1 - 5 2012

One factor of resonant wavelength shift from one-wavelength to two-wavelength resonance in loop-tube-type thermoacoustic cooling system

S. Sakamoto, D. Tsukamoto, Y. Kitadani, Y. Inui, and Y. Watanabe

International Conference on Ultrasonics 2011 2011.12

Fundamental study for a working mechanism of Phase Adjuster set on thermoacoustic cooling system

K. Sahashi, S. Sakamoto, and Y. Watanabe

International Conference on Ultrasonics 2011 2011.12

Miniaturization of the loop-tube-type thermoacoustic cooling system-Effect of the installation position of heat pump and working gas in the tube- Reviewed

K. Hotta, S. Sakamoto, D. Tsukamoto, and Y. Watanabe,

Appl. Phys. ( 07HE17 ) 2011.7

Applying Sub-Loop Tube to Control the Sound Field in Loop-Tube-Type Thermoacoustic System Reviewed

S. Sakamoto, K. Sahashi, Y.Kitadani,T.Ishino,and Y. Watanabe

Jpn. J. Appl. Phys. ( 07HE20-1 -5 ) 2011.7

Finite element analysis of the standing wave field in a tube with lossy wall for thermoacoustic system Reviewed

M. Nishikori, T. Tsuchiya, and S. Sakamoto,

Jpn. J. Appl. Phys. ( 07HE21-1 -4, ) 2011.7

小型熱音響冷却システムにおけるスタック位置とヒートポンプ効果について Reviewed

堀田浩平，坂本眞一，渡辺好章

Acoust. Sci. & Tech. 67 ( 4 ) 145 - 151 2011.4

熱音響プライムムーバのエネルギー変換効率向上に向けた研究-スタック内の温度勾配に関する検討- Reviewed

小宮慎太郎，坂本眞一，渡辺好章

Thermal Science & Engineering 19 ( 1 ) 9 - 16 2011.1

Investigation on Transient Voltage Response of Lithium-Ion Secondary Battery Degraded by Constant Current Charge/Discharge Cycles

T. Tanaka, M. Muramatsu, T. Takagi, N. Kakimoto, Y. Inui, and S. Sakamoto

Proceedings of International Conference on Electrical Engineering 2011 ( ICEE-A167 ) 2011

Effect of Sub-Loop Tube on Energy Conversion Efficiency of Loop-Tube-Type Thermoacoustic System

S. Sakamoto, D. Tsukamoto, Y. Kitadani, and Y. Watanabe

International Conference on Acoustics 2010 2010.8

Basic study for practical use of thermoacoustic electric generation system

Y. Kitadani, S. Sakamoto, K. Sahashi, and Y. Watanabe

International Conference on Acoustics 2010 2010.8

大型熱音響冷却システムの実用化に向けた検討（管の断面積が熱から音へのエネルギー変換に与える影響） Reviewed

北谷裕次，坂本眞一，黒田健太朗，渡辺好章

日本機械学会論文集（B編） 77 ( 776 ) 2010.4

Applying Diverging Tube for the Low-Temperature Drive in a Loop-Tube-Type Thermoacoustic System Reviewed

T. Ishino, S. Sakamoto, M. Nishikawa, and Y. Watanabe

Jpn. J. Appl. Phys. 07GM12-1-3 ( 07GM12-1-3 ) - - - 2009.7

Energy Conversion from Sound to Heat by Using Lamination Mesh on the Thermoacoustic System Reviewed

A. Sakaguchi, S. Sakamoto, Y. Tsuji, and Y. Watanabe

Jpn. J. Appl. Phys. 07GM13-1-3 ( 07GM13-1-3 ) - - - 2009.7

熱音響原動機における非線形現象とその影響について Reviewed

坂本　眞一，小宮　慎太郎，渡辺　好章

電子情報通信学会論文誌　A J91-A, ( 12 ) 1161 - 1165 2008.12

Reduction in Temperature Difference of Prime Mover Stack in Loop-Tube-Type Thermoacoustic Cooling System by Applying Phase Adjuster Reviewed

S. Sakamoto, and Y. Watanabe

Jpn. J. Appl. Phys. 47 ( 5 ) 3776 - 3780 2008.5

Miniaturization of Thermoacoustic Cooling System Considering Energy Conversion Efficiency Estimated Using Specific Parameter Reviewed

T. Wakata, S. Sakamoto, M. Nishikawa and Y. Watanabe

Jpn. J. Appl. Phys. 47 ( 5 ) 4239 - 4241 2008.5

Effect of Copper Mesh at Interface between Stack and Heat Source in Thermoacoustic Cooling System Reviewed

N. Miya, S. Sakamoto, and Y. Watanabe

Jpn. J. Appl. Phys. 47 ( 5 ) 4235 - 4238 2008.5

How to Design a Thermoacoustic System Considering the Relaxation Time t: Introduction of Parameter ωt to Determine the Position of Stack Reviewed

Y. Tsuji, S. Sakamoto, T. Ishino, Y. Watanabe, and J. Senda

Jpn. J. Appl. Phys. 47 ( 5 ) 4231 - 4234 2008.5

Effect of Inner Diameter Change of Phase Adjuster on Heat-to-Sound Energy Conversion Efficiency in Loop-Tube-Type Thermoacoustic Prime Mover Reviewed

S. Sakamoto, M. Nishikawa, T. Ishino, Y. Watanabe, and J. Senda

Jpn. J. Appl. Phys. 47 ( 5 ) 4223 - 4225 2008.5

「熱の影響による音圧変化を考慮した音響FDTDシミュレーション～温度勾配のある細流路を通過する音波について～」 Reviewed

原　康人，坂本　眞一，長谷　芳樹，渡辺　好章

Acoust. Sci. & Tech. 63 ( 12 ) 701 - 707 2007.12

Improvement of Cooling Effect of Loop-Tube-Type Thermoacoustic Cooling System Applying Phase Adjuster Reviewed

S. Sakamoto, Y. Imamura and Y. Watanabe

Jpn. J. Appl. Phys. 46 ( 7B ) 4951 - 4955 2007.5

Study on Thermoacoustic Cooling System Using a Resonance Tube to Induce One-wavelength Mode Resonance Reviewed

H. Yoshida, S. Sakamoto and Y. Watanabe

Jpn. J. Appl. Phys. 46 ( 7A ) 4413 - 4416 2007.5

Modulation of Sound Field in Looped Tube Thermoacoustic Cooling System with Membrane Reviewed

Y. Imamura, S. Sakamoto and Y. Watanabe

Jpn. J. Appl. Phys. 46 ( 7A ) 4417 - 4420 2007.5

Improvement in Performance of Stack as Heat Pump of Thermoacoustic Cooling System: Effect of Thickness of Heat Boundary Layer upon Cooling Effect Reviewed

S. Sakamoto and Y. Watanabe

Jpn. J. Appl. Phys. 45 ( 12 ) 9257 - 9258 2006.12

Experimental study on resonance frequency of loop-tube-type thermoacoustic cooling system Reviewed

S. Sakamoto and Y. Watanabe

Acoust. Sci. & Tech. 27 ( 6 ) 361 - 365 2006.6

Generation Mechanism of Heat Flows near the Stack as a Prime Mover in a Thermoacoustic Cooling System Reviewed

S. Sakamoto, T. Tsujimoto and Y. Watanabe

Jpn. J. Appl. Phys. 43 ( No.5A ) 2751 - 2753 2004.5

The experimental studies of thermoacoustic cooler Reviewed

S. Sakamoto and Y. Watanabe

Ultrasonics 42 ( - ) 53 - 56 2004.1

Experimental Study on Acoustic Streaming in Water Containing Microcapsules Reviewed

T. Okabe, S. Sakamoto and Y. Watanabe

Jpn. J. Appl. Phys. 40 ( No.5A ) 3861 - 3864 2001.5

Effects of Existence of Micro Bubbles for Increase of Acoustic Steaming Reviewed

S. Sakamoto and Y. Watanabe

Jpn. J. Appl. Phys. 38 ( Part 1 No. 5B ) 3050 - 3052 1999.5

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Papers - SAKAMOTO Shin-ichi