研究者詳細 - 和田　親宗

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Basic Study on Viewpoints Classification Method using Car Distribution on the Road 査読有り国際誌

Noda M., Miyamoto H., Tangsuksant W., Kitagawa K., Wada C.

2018 International Conference on Information and Communication Technology Robotics, ICT-ROBOT 2018 2018年11月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. In order to provide a notification system for the blind awaiting a bus, a classification of viewpoints is necessary. In a previous study, we classified the viewpoints in non-congested traffic using road features extraction. However, the viewpoints in congested traffic have not yet been discussed; hence this paper proposes a viewpoints classification using car distribution on the road in congested traffic. The study aimed to classify the viewpoints to two classes as "Good Viewpoints" and "Bad Viewpoints" with 100 images for each class. The experimental results showed a 76% accuracy of the proposed method.

DOI： 10.1109/ICT-ROBOT.2018.8549907

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Effects of crutch tips position to the lateral bending and rotation of the spinal column during crutch walking 査読有り国際誌

Yoshiki Nishisako, Takayuki Nagasaki, Chikamune Wada

21st International Conference on Mechanics in Medicine and Biology PLH-210 2018年11月

Influence of lower-limb muscle during ladder-climbing in lower-limb amputees 査読有り国際誌

Kisuke Iwasaki, Gen Okuya, Naoki Chijiwa, Hisashi Arizono, Chikamune Wada

21st International Conference on Mechanics in Medicine & Biology 2018年11月

Relationship between foot position and stresses of the L4 L5 joint in supported standing-up via musculoskeletal simulation 査読有り国際誌

Kodai Kitagawa, Yoshiki Nishisako, Takayuki Nagasaki, Sota Nakano, Chikamune Wada

21st International Conference on Mechanics in Medicine and Biology PSS-204 2018年11月

Classification of Viewpoints Related to Bus Waiting for the Assistance of Blind People 査読有り国際誌

Watcharin Tangsuksant,Chikamune Wada

International Journal of New Technology and Research 4 ( 9 ) 43 - 52 2018年09月

等価回路モデルを用いた体導音センサの周波数特性推定査読有り

城屋敷健志,和田親宗

生体医工学 56 ( 2 ) 44 - 51 2018年09月

Wearable robotic glove for hand rehabilitation based on real time pressure measurement system 査読有り国際誌

Ahmed M. M. Almassri, Wan Zuha Wan Hasan, Siti Anom Ahmad, Suhaidi Shafie, Chikamune Wada, Keiichi Horio

6th International Symposium on Sensor Science (I3S 2018) 2018年08月

Self-calibration algorithm for a pressure sensor with a real-time approach based on an artificial neural network 査読有り国際誌

Almassri A., Hasan W., Ahmad S., Shafie S., Wada C., Horio K.

Sensors (Switzerland) 18 ( 8 ) 2018年08月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This paper presents a novel approach to predicting self-calibration in a pressure sensor using a proposed Levenberg Marquardt Back Propagation Artificial Neural Network (LMBP-ANN) model. The self-calibration algorithm should be able to fix major problems in the pressure sensor such as hysteresis, variation in gain and lack of linearity with high accuracy. The traditional calibration process for this kind of sensor is a time-consuming task because it is usually done through manual and repetitive identification. Furthermore, a traditional computational method is inadequate for solving the problem since it is extremely difficult to resolve the mathematical formula among multiple confounding pressure variables. Accordingly, this paper describes a new self-calibration methodology for nonlinear pressure sensors based on an LMBP-ANN model. The proposed method was achieved using a collected dataset from pressure sensors in real time. The load cell will be used as a reference for measuring the applied force. The proposed method was validated by comparing the output pressure of the trained network with the experimental target pressure (reference). This paper also shows that the proposed model exhibited a remarkable performance than traditional methods with a max mean square error of 0.17325 and an R-value over 0.99 for the total response of training, testing and validation. To verify the proposed model’s capability to build a self-calibration algorithm, the model was tested using an untrained input data set. As a result, the proposed LMBP-ANN model for self-calibration purposes is able to successfully predict the desired pressure over time, even the uncertain behaviour of the pressure sensors due to its material creep. This means that the proposed model overcomes the problems of hysteresis, variation in gain and lack of linearity over time. In return, this can be used to enhance the durability of the grasping mechanism, leading to a more robust and secure grasp for paralyzed hands. Furthermore, the exposed analysis approach in this paper can be a useful methodology for the user to evaluate the performance of any measurement system in a real-time environment.

DOI： 10.3390/s18082561

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Automatic classification method using machine learning with a single inertial measurement unit for trunk posture category of OWAS 査読有り国際誌

Kodai Kitagawa, Sai-Wei Yang, Fan-Chih Kuo, Chikamune Wada

World Congress on Medical Physics and Biomedical Engineering 2018 (WC2018) ID 1660 2018年06月

An estimation method for lower-limb joint angles during the motion of standing up using an inertial measurement unit 査読有り国際誌

Chikamune Wada, Fan Jin, Takayuki Nagasaki

World Congress on Medical Physics and Biomedical Engineering 2018 (WC2018) ID 1695 2018年06月

1D4-2　鏡映描写課題遂行時の自律神経系指標と主観的メンタルワークロード

倉岡宏幸, 和田親宗, 三宅晋司

人間工学 ( 一般社団法人日本人間工学会 ) 54 ( Supplement ) 1D4-2 - 1D4-2 2018年06月

Force feedback training system to hold axillary crutch stably 査読有り国際誌

Wada C., Nagasaki T.

Proceeding - 2017 5th International Conference on Electrical, Electronics and Information Engineering: Smart Innovations for Bridging Future Technologies, ICEEIE 2017 2018-January 71 - 76 2018年03月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2017 IEEE. This study aimed to decrease risk of falls via displacement of the axilla during crutch walking. An axillary force feedback system is developed for providing a visual information to crutch users. An imbalance point is existed between the force of the upper arm on the axillary pad and the force of the chest wall on the axillary pad. Moreover, the system also provides real-time information on force placed on axillary pads during crutch walking and evaluated the effectiveness of our training system. Results suggested that this feedback system was effective for beginners.

DOI： 10.1109/ICEEIE.2017.8328765

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Novel method for evaluation of hindfoot alignment in weight-bearing position using laser beam 査読有り

Ohnishi Tadasuke, Hida Mitsumasa, Nakamura Yukio, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 30 ( 3 ) 474 - 478 2018年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

[Purpose] It is clinically important to accurately evaluate the alignment of hindfoot alignment from the body surface in weight-bearing position. In general, measurement is carried out using a goniometer, but the measurement with goniometer requires experience, and the reliability in this measurement is also in question. Therefore, it is necessary to establish a clinical measurement method to replace the goniometer. As a solution, we devised a hindfoot alignment measurement method with laser beam (HAML), which measures hindfoot alignment along the body surface using a laser beam. This study aimed to study the correlation between the measurement result along the body surface with laser or goniometer and that of radiography with regard to hindfoot alignment. [Subjects and Methods] Subjects included 23 individuals with knee osteoarthritis. Their hindfoot alignment using radiography and goniometry were measured. The correlation between the measurement result along the body surface with or without laser and radiography was investigated. [Results] The correlation between HAML and radiography was better than that between HAML and goniometry. [Conclusion] The correlation between radiography and HAML for measuring hindfoot alignment was good. This finding implies that HAML can be used as a screening test or epidemiological survey in regional medicine.

DOI： 10.1589/jpts.30.474

その他リンク： https://ci.nii.ac.jp/naid/130006413901

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

Jin Fang, Nagasaki Takayuki, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 30 ( 5 ) 669 - 674 2018年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

[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

その他リンク： https://ci.nii.ac.jp/naid/130006732364

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

Ohnishi Tadasuke, Hida Mitsumasa, Nagasaki Takayuki, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 30 ( 9 ) 1168 - 1172 2018年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

[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

その他リンク： https://ci.nii.ac.jp/naid/130007481316

Estimation of the frequency response of body-conducted sound sensors via the equivalent circuit model 査読有り

Joyashiki T., Wada C.

Transactions of Japanese Society for Medical and Biological Engineering ( 公益社団法人日本生体医工学会 ) 56 ( 2 ) 44 - 51 2018年01月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

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 100-2,000 Hz. In the statistical analysis, by varying the mass and contact area, significant differences were observed in the frequency range of 700-2,000 Hz while no significant differences were observed in the frequency range of 100-600 Hz. 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 700-2,000 Hz, and their frequency characteristics can be estimated by simulation.

DOI： 10.11239/jsmbe.56.44

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Design of a wireless surface EMG acquisition system 査読有り国際誌

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年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2017 IEEE. Wireless Technology plays a significant role in current world. Many applications use wireless sensor network for health monitoring. One of the examples is the application to measure muscle response or electrical activity in response to a nerve's stimulation of the muscle. The development of wireless Electromyography (EMG) for remote monitoring of muscle activities is one of many vital parts in the biomedical technology. This wireless EMG is able to transmit signals through wireless transmission to computer for monitoring. By employing this technology, doctors treating patients with muscle complication can monitor their patients from the comfort of their office while the patients roam freely in their own room or therapy room. This technology is essential for patients with needs of home-based monitoring and economical medical services. The design of wireless EMG system comprises of a preamplifier and an electrode for the measurement of EMG signal, main amplifier for signal processing, DSP processor for A/D conversion and X-Bee module for wireless transmission. During power spectral density, EMG signal is distributed between 10 to 500Hz. Thus, EMG signals become consistent with the application of wireless transmission.

DOI： 10.1109/M2VIP.2017.8211481