Faculty Profiles - WADA Chikamune

Papers - WADA Chikamune

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New estimation model of the initial lower limb angle to improve angle estimation during the extension phase of standing-up movement Reviewed

Jin Fang, Nagasaki Takayuki, Wada Chikamune

Journal of Physical Therapy Science ( The Society of Physical Therapy Science ) 30 ( 5 ) 669 - 674 2018.01

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

[Purpose] An estimation model of the knee and ankle joint angles during the extension phase was proposed in the previous study. However, it had limited use because of the fixed initial lower limb angle before standing up. This study aimed to propose a new estimation model of the initial lower limb angle to improve the angle estimation during extension phase. [Subjects and Methods] Seven healthy male volunteers were enrolled. The new estimation model approximated the initial lower limb angle using a force sensor plate that measured the plantar pressure of the subjects. The estimated angle and force were compared to those obtained by a motion capture system and force plate. [Results] The new estimation model of initial lower limb angle showed no significant difference compared with the true values obtained by motion capture, except for the subject who had a greater foot-pressure measurement error compared with the force plate measurement, with maximum errors of 5.98° and 6.31°, respectively. [Conclusion] The proposed model in this study can estimate the initial lower limb angle before standing and can be applied to the angle estimation model during the extension phase of the standing-up movement.

DOI： 10.1589/jpts.30.669

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130006732364

Novel method for evaluation of frontal plane knee alignment using bony prominences in patients with osteoarthritis Reviewed

Ohnishi Tadasuke, Hida Mitsumasa, Nagasaki Takayuki, Wada Chikamune

Journal of Physical Therapy Science ( The Society of Physical Therapy Science ) 30 ( 9 ) 1168 - 1172 2018.01

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

[Purpose] Angle measurement using images of bony prominences (AMI) determines frontal plane knee alignment from the skin surface without using radiation. The purpose of this study was to assess the validity and reliability of images obtained with the AMI method. [Participants and Methods] The study included 21 patients with osteoarthritis. We measured the functional axis of the lower limb, obtained via full-leg radiography and correlated the findings with the angle of dissection and the angle measured with the AMI method. Additionally, we assessed the reliability of the AMI method. [Results] The angle obtained using the AMI method and the radiographic anatomic axis (the full-leg radiograph)/the mechanical axis were well correlated. The AMI method also showed high reliability. [Conclusion] The AMI method is a valid and reliable alternative to full-leg radiography for imaging of functional and anatomical knee axes. As AMI does not use special equipment or involve radiation exposure, the method can be used in outside medical facilities and can be repeated over time without increased risk to patients.

DOI： 10.1589/jpts.30.1168

CiNii Article

CiNii Research

Other Link： https://ci.nii.ac.jp/naid/130007481316

Estimation of the Frequency Response of Body-conducted Sound Sensors via the Equivalent Circuit Model Reviewed

JOYASHIKI Takeshi, WADA Chikamune

Transactions of Japanese Society for Medical and Biological Engineering ( Japanese Society for Medical and Biological Engineering ) 56 ( 2 ) 44 - 51 2018.01

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

Body-conducted sound sensors have an electret condenser microphone with an exposed diaphragm. By covering the sensor with a urethane elastomer, the sensor can be used as a bioacoustic sensor with high sensitivity and resistance to external noise. The body-conducted sound sensors constructed in the past had different parameters such as contact area, thickness of the propagation layer and mass, and the extent of their influence on frequency characteristics is unclear. This study aimed to investigate the influence of the mass and shape of body-conducted sound sensor on pressure sensitivity. The methods comprised ( 1 ) simulation using the equivalent circuit model, ( 2 ) production of body-conducted sound sensors and measurement systems, and ( 3 ) sensitivity measurements and analyses. The simulation results demonstrated that the sensitivity increased when the body-conducted sound sensor had a small mass and a large contact area. In the sensitivity measurement system, a compact acceleration sensor was used as a reference sensor, and the sensitivity to pressure was calculated. The results obtained from the sensitivity measurement system correlated strongly with the frequency characteristics of the simulations, with a correlation coefficient of 0.90-0.95 in the frequency range of 100-2,000Hz. In the statistical analysis, by varying the mass and contact area, significant differences were observed in the frequency range of 700-2,000Hz while no significant differences were observed in the frequency range of 100-600Hz. Moreover, as a result of reducing the housing mass, sensitivity was increased. In conclusion, body-conducted sound sensors with a small mass and large contact area exhibit high pressure sensitivity in the frequency range of 700-2,000Hz, and their frequency characteristics can be estimated by simulation.

DOI： 10.11239/jsmbe.56.44

Scopus

CiNii Article

CiNii Research

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85067125589&origin=inward

Design of a wireless surface EMG acquisition system Reviewed International journal

Ishak A., Ahmad S., Soh A., Naraina N., Jusoh R., Chikamune W.

2017 24th International Conference on Mechatronics and Machine Vision in Practice, M2VIP 2017 2017-December 1 - 6 2017.12

New Combination Method for Road Features Extraction Reviewed

Paper ID:104A4 2017.11

n estimation method of knee and ankle joint angles during standing up motion using an inertial sensor Reviewed International journal

2017.11

Development of Axillary Pressure Feedback System for Crutch Walking Reviewed International journal

Paper FrBT16.2 2017.07

Auto-grasping algorithm of robot gripper based on pressure sensor measurement Reviewed International journal

ALmassri A.M.M., Wada C., Wan Hasan W.Z., Ahmad S.A.

Pertanika Journal of Science and Technology 25 ( S ) 113 - 122 2017.02

Artificial Neural Network Based Step-Length Prediction Using Ultrasonic Sensors from Simulation to Implementation in Shoe-Type Measurement Device Reviewed

Journal of Advanced Computational Intelligence and Intelligent Informatics 21 ( 2 ) 321 - 329 2017.02

Study of the Relationship Between Sit-to-Stand Activity and Seat Orientation Reviewed

21 ( 2 ) 337 - 341 2017.02

Real-time human motion analysis and grasping force using the OptiTrack system and flexi-force sensor Reviewed International journal

Saidon N.F.E., Wada C., Ahmad S.A., Rahman R.Z.A., Eguchi K., Tomiyama Y., Rahman F.I.A.

Pertanika Journal of Science and Technology 25 ( S ) 69 - 76 2017.01

An estimation of knee and ankle joint angles during extension phase of standing up motion performed using an inertial sensor Reviewed

Jin Fang, Nagasaki Takayuki, Wada Chikamune

Journal of Physical Therapy Science ( The Society of Physical Therapy Science ) 29 ( 7 ) 1171 - 1175 2017.01

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

[Purpose] Motion capture system is difficult to use in daily life. The aim of this study was to propose an estimation model for knee and ankle joint angle measurements and locate body center of gravity (COG) of the extension phase during standing-up motion. [Subjects and Methods] Seven healthy male volunteers were enrolled. An estimation model was proposed for the knee and ankle joint angle measurements by combining the angle and acceleration of the trunk, based on readings from the inertial sensor attachment on the subject’s chest, during the extension phase. Joint angles and COG position were compared to those obtained by a motion capture system. [Results] The joint angles and COG position demonstrated high correlation coefficients which represent strong correlation between the proposed model and the motion capture system. The proposed model could estimate the joint angle during extension phase, with a maximum error of 4.58 degrees, as well as COG position in the horizontal and vertical directions with maximum errors of 4.48 cm and 3.19 cm, respectively. [Conclusion] The proposed system could be used instead of motion capture system to estimate knee and ankle joint angles; however, the estimation of the COG position was insufficient because of lacked accuracy.

DOI： 10.1589/jpts.29.1171

Scopus

CiNii Article

CiNii Research

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85024372785&origin=inward

Attitude Estimation using Kalman Filtering: External Acceleration Compensation Considerations Reviewed International journal

Romy B. Widodo, C. Wada

Journal of Sensors 2016 Article ID 6943040 2016.12

Wearable Robotic Hand Glove System Based on Multi Force Sensors for Rehabilitation Application Reviewed

87 2016.12

Analysis of Foot Plantar Pressure using Platform System for Foot Health Screening Reviewed

89 2016.12

Estimation of lower limb angle from inertial sensor to estimate extension phase during standing-up movement Reviewed

91 2016.12

Improvement Study on a Shoe-type Measurement Device Reviewed

92 2016.12

Analysis of pressure exerted on the hand grip to estimate the pressure applied to the palm during double-crutch walking Reviewed

93 2016.12

Trial Manufacture of Grasping Force Feedback System Using Pressure Stimulus for Prosthesis Limb Reviewed

177 2016.12

Physical Measurement for Human Assistive Technology Invited Reviewed International journal

2016.09

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Papers - WADA Chikamune