研究者詳細 - 和田　親宗

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105001174540&origin=inward

鍼刺激誘発による血中ヘモグロビン結合の一酸化窒素が及ぼす遠隔部末梢血管拡張査読有り

米田哲哉, 山川烈, 和田親宗

バイオメディカル・ファジィ・システム学会誌 ( バイオメディカル・ファジィ・システム学会 ) 26 ( 2 ) 53 - 58 2025年02月

担当区分：最終著者記述言語：日本語掲載種別：研究論文（学術雑誌）

鍼灸刺激により局所と遠隔部の血流が増加するメカニズムは、上脊髄反射が関与するとされてきた．しかし、筆者らの予備実験では、上脊髄反射の関与だけでは説明できない事象が観察された．血管拡張に一酸化窒素が関与することと，一酸化窒素は血中に拡散し，ヘモグロビンと結合することから，鍼刺激によって発生した一酸化窒素が血液で運ばれ、遠隔部で血管拡張を引き起こすという仮説を立てた．本研究では，ヒトを対象に指尖容積脈波計を用いて経皮酸素飽和度（SpO2）と心拍数（HR）を，また血流スコープを用いて血管径を測定することにより，一酸化窒素の存在とそれによ
る血管拡張現象の検証実験をおこなった．その結果，鍼刺激部位と測定部位との距離が近いほど，鍼刺激から血管拡張が生じるまでの時間が短かった．このことから，鍼刺激により発生した一酸化窒素が，血中に拡散し，ヘモグロビンと結合し，末梢血管に運搬され，遠隔部末梢血管拡張に寄与していることが推定できる．

DOI： 10.24466/jbfsa.26.2_53

その他リンク： http://id.ndl.go.jp/bib/034049756

体導音センサと畳み込みニューラルネットワークを用いたシャント音スペクトログラム画像からの自己血管内シャント機能評価推定査読有り

城屋敷健志, 和田親宗

医療機器学 ( 一般社団法人日本医療機器学会 ) 95 ( 1 ) 30 - 36 2025年01月

変形性膝関節症に対して開発した膝装具と既存装具の比較査読有り

山本裕晃, 遠藤正英, 馬場智大, 橋本将志, 和田親宗

理学療法科学 ( 理学療法科学学会 ) 40 ( 1 ) 42 - 46 2025年01月

担当区分：最終著者記述言語：日本語掲載種別：研究論文（学術雑誌）

〔目的〕装着圧力に着目して開発した膝装具と既存装具とを変形性膝関節症患者に装着し，装着圧力が高くなるか否かと，対象者による主観的な評価を比較した結果を検討した．〔対象と方法〕対象は変形性膝関節症患者20名（男性8名，女性12名）とした．まず，装着した際の装着圧力を既存装具と開発装具で比較した．計測後は，既存装具と開発装具で，装着難度，通気性，外観，重量感，装着感をVisual Analogue Scaleを用いて対象者の主観的な評価を比較した．〔結果〕装着圧力は，既存装具と開発装具に有意差が認められた．主観的な評価は有意差が認められなかった．〔結語〕開発装具は，装着圧力が既存装具より高く設定することが可能であったが，主観的な評価による差異は生じなかった．

DOI： 10.1589/rika.40.42

その他リンク： https://www.jstage.jst.go.jp/article/rika/40/1/40_42/_pdf

Feature Selection via Decision Tree in Foot Position Recognition during Patient Transfer using Smartphone Inertial Sensor 査読有り国際誌

Kodai Kitagawa, Ryo Takashima, Tadateru Kurosawa, Chikamune Wada

SICE Festival 2024 with Annual Conference (SICE2024) WeBT11.21 2024年08月

Effects of electrical stimulation of antagonist muscles on shoulder joint adduction force and grip strength 査読有り国際誌

Nakano Sota, Okada Hirotaka, Nakamura Kouichi, Kitagawa Kodai, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 36 ( 7 ) 378 - 381 2024年07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）

[Purpose] This study aimed to determine whether applying electrical stimulation to the deltoid and extensor digitorum muscles could lead to a reduction in fixation force during shoulder joint adduction and grip strength. [Participants and Methods] Fifteen healthy adult males participated in this study. In the shoulder adduction force experiment, the middle fibers of the deltoid muscle of the dominant arm were electrically stimulated. In the grip strength experiment, the extensor digitorum muscle of the dominant arm was electrically stimulated. The forces exerted with and without the electrical stimulation were measured. [Results] The torque of the shoulder adduction force decreased significantly with electrical stimulation, while no significant change was observed in normalized grip strength with electrical stimulation. [Conclusion] The response of antagonist muscles to electrical stimulation varied according to location.

DOI： 10.1589/jpts.36.378

その他リンク： https://www.jstage.jst.go.jp/article/jpts/36/7/36_2024-018/_pdf

Inducing unstable walking conditions through visual and auditory stimuli 査読有り国際誌

Tomomasa Ohara, Chong Yu Zheng(UTAR), Shinji Murata, Chikamune Wada

J. Phys. Ther. Sci. 36 330 - 336 2024年06月

Foot Position Recognition Using a Smartphone Inertial Sensor in Patient Transfer 査読有り国際誌

Kodai Kitagawa, Ryo Takashima, Tadateru Kurosawa, Chikamune Wada

BioMed 4 ( 2 ) 112 - 121 2024年04月

Human Detection and Human Pose Classification for Mobile Robots Interaction 査読有り国際誌

K. Hirunthakingpunt, D. Dawan, C. Wada, N. Maneerung

2024 1st International Conference on Robotics, Engineering, Science, and Technology (RESTCON) 1 - 6 2024年02月

Enhancing Bus Number Detection Efficiency with Transfer Learning and Fine-Tuned Optical Character Recognition 査読有り国際誌

R. Arifando, S. Eto, C. Wada

2024 1st International Conference on Robotics, Engineering, Science, and Technology (RESTCON) 106 - 111 2024年02月

Deciphering pixel insights: A deep dive into deep learning strategies for enhanced indoor depth estimation 査読有り国際誌

Krisna Pinasthika, Fitri Utaminingrum(Brawijaya Univ), Chih‑Yang Lin, Chikamune Wada, Timothy K. Shih

International Journal of Information Management Data Insights 4 ( 1 ) 2024年02月

Foot Clearance Prediction using Wrist Acceleration and Gait Speed 査読有り国際誌

Kodai Kitagawa, Chikamune Wada, Nobuyuki Toya

Journal of Electronics, Electromedical Engineering, and Medical Informatics 6 ( 1 ) 32 - 39 2024年01月

Evaluating YOLOv8 model With Out-of-distribution dataset and shape bias 査読有り国際誌

Eto S., Wada Y., Wada C.

GCCE 2024 - 2024 IEEE 13th Global Conference on Consumer Electronics 648 - 649 2024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（国際会議プロシーディングス）

In recent years, numerous convolutional neural network (CNN) models have been proposed to achieve a high performance. Among them, YOLOv8 is a suitable model for edge devices with limited hardware resources because YOLOv8 is designed with consideration for deployment on edge devices such as consumer electronics. However, CNNs in edge devices must be robust against out-of-distribution data, and their robustness against out-of-distribution data has not been sufficiently verified. This study verifies the robustness of YOLOv8 for out-of-distribution data. We measured the out-of-distribution accuracy of lightweight models trained on ImageNet running in real time on the YOLOv8 backbone and edge devices. We also measured shape bias, the tendency to emphasize shape when categorizing, because it is known to be related to the robustness of out-of-distribution data. We trained YOLOv8 with ImageNet and evaluated it based on the out-of-distribution accuracy and shape bias. The experimental results show that the YOLOv8 backbone has a lower out-of-distribution accuracy than the other lightweight models. Moreover, the shape bias may facilitate the learning of feature representations that are useful for downstream tasks.

DOI： 10.1109/GCCE62371.2024.10760789

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85213404576&origin=inward

Meal Guidance System for Visually Impaired People 査読有り国際誌

Hitunthakingpunt K., Wada C.

2024 Joint 13th International Conference on Soft Computing and Intelligent Systems and 25th International Symposium on Advanced Intelligent Systems, SCIS and ISIS 2024 2024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（国際会議プロシーディングス）

Eating independently is a significant challenge for visually impaired individuals, and meal support devices can help them achieve this goal. Key information such as food types, plate positions, and the amount of remaining food is essential for creating an effective meal support system. This study proposes a method to detect and identify various food types, locate each plate on the dining table, and calculate the remaining food on each plate, expressed as a percentage. The research consists of three main steps. First, we modified the open-source UECFOOD100 dataset, selecting 63 classes of food with 11,140 images for food identification. The YOLO detection model was then trained to identify the food types, while a pre-trained YOLO model was used to detect and locate plates on the table. The bounding boxes generated by the detection model were used to determine the plate positions. Finally, an image processing technique calculated the remaining food on each plate, displaying the value as a percentage. The YOLO algorithm achieved precision, recall, mAP50, and mAP50-95 scores of 0.656, 0.537, 0.596, and 0.425, respectively. The system effectively determines the remaining food percentage on plates, aiding visually impaired individuals in meal management.

DOI： 10.1109/SCISISIS61014.2024.10759937

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85214671891&origin=inward

Vertebral Force Prediction during Manual Lifting using Sagittal Plane Posture and Machine Learning 査読有り国際誌

Kitagawa K., Hida M., Wada C., Yamamoto H.

GCCE 2024 - 2024 IEEE 13th Global Conference on Consumer Electronics 952 - 953 2024年01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）

Vertebral force during manual lifting causes lower back pain (LBP) among workers in various occupational fields. Continuous monitoring of vertebral force is required for preventing LBP. Vertebral force can be measured directly by implant devices; however, these implant devices are difficult to install on general workers. Non-invasive technologies such as an optical motion capture system could estimate vertebral force, however, special measurement devices are necessary. The objective of this study is to propose non-invasive measurement method for vertebral force using ordinary digital camera. The proposed method predicts vertebral forces by machine learning and sagittal plane posture during manual lifting. The proposed method predicted vertebral forces for 48 trials manual lifting via leave-one-out-cross-validation. Training and testing of the proposed method used OrthoLoad database that included sagittal 2D images and vertebral force obtained from implant device. The results showed that the proposed method using model tree algorithm could predict vertebral force by greater than 0.7 correlation with actual values. These results indicate possibility that the proposed method can be used for vertebral force assessments using ordinary devices.

DOI： 10.1109/GCCE62371.2024.10760826

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85213360053&origin=inward

Convolutional Neural Network Based Zebra Crossing and Pedestrian Traffic Light Recognition 査読有り国際誌

Shinji Eto, Yasuhiro Wada, Chikamune Wada

Journal of Mechanical and Electrical Intelligent System 6 ( 3 ) 1 - 11 2023年12月

Investigation of factors influencing low physical activity levels in community-dwelling older adults with chronic pain: a cross-sectional study 査読有り国際誌

Hida M., Imai R., Nakamura M., Nakao H., Kitagawa K., Wada C., Eto S., Takeda M., Imaoka M.

Scientific Reports 13 ( 1 ) 2023年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Low levels of physical activity in individuals with chronic pain can lead to additional functional impairment and disability. This study aims to investigate the predictors of low physical activity levels in individuals with chronic pain, and to determine the accuracy of the artificial neural network used to analyze these predictors. Community-dwelling older adults with chronic pain (n = 103) were surveyed for their physical activity levels and classified into low, moderate, or high physical activity level groups. Chronic pain-related measurements, physical function assessment, and clinical history, which all influence physical activity, were also taken at the same time. Logistic regression analysis and analysis of multilayer perceptron, an artificial neural network algorithm, were performed. Both analyses revealed that history of falls was a predictor of low levels of physical activity in community-dwelling older adults. Multilayer perceptron analysis was shown to have excellent accuracy. Our results emphasize the importance of fall prevention in improving the physical activity levels of community-dwelling older adults with chronic pain. Future cross-sectional studies should compare multiple analysis methods to show results with improved accuracy.

DOI： 10.1038/s41598-023-41319-7

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85168959895&origin=inward

Preliminary Study of Stereophonic Sound-based Electric Travel Aid for the Visually Impaired 査読有り国際誌

Shinji Eto, Hinami Sakai Wada, Chikamune Wada

11th International Symposium on Applied Engineering and Sciences (SAES2023) ID229 2023年11月

Induction of unstable walk using visual stimulation 査読有り国際誌

Tomomasa Ohara, Chong Yu Zheng(UTAR), Chikamune Wada

11th International Symposium on Applied Engineering and Sciences (SAES2023) ID195 2023年11月

Effects of Foot Placements on Lumbar Loads in Patient Transfer Motion: Comparison Between Anteroposterior and Mediolateral Placements 査読有り国際誌

Kodai Kitagawa, Hayato Nodagashira, Tadateru Kurosawa, Hinako Maeyama, Chikamune Wada

2023 IEEE 12th Global Conference on Consumer Electronics (IEEE GCCE 2023) 257 - 258 2023年10月

Comparison of Regression Models for Foot Position Prediction during Patient Lifting Motion using a Single Inertial Sensor 査読有り国際誌

Kodai Kitagawa, Chikamune Wada, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu

SICE Annual Conference 2023 (SICE2023) FrPOS2.19 2023年09月

Staggering Gait Detection Method using Wrist Acceleration 査読有り国際誌

Nobuyuki Toya, Kodai Kitagawa, Chikamune Wada

2023 45th Annual International Conference of the IEEE Engineering in Medicine & Biology Conference (EMBC2023) No.2549 2023年08月

Development of a Robotic Hand Glove System for Secure Grasp with AI Wireless Sensor Data 査読有り

Almassri A., Koyanagi K., Wada C., Horio K., Hasan W.Z.W.(UPM)

2023 IEEE International Conference on Mechatronics and Automation, ICMA 2023 669 - 674 2023年08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）

Robotic Hand glove is one of the most commonly used technique in the rehabilitation systems. In this paper, we developed a robotic hand system with a proposed sensing mechanism-based AI algorithm, which can acquire grasping forces from human fingers. It is composed of five low-cost force sensors attached to the glove's fingertips and wireless data logger. Several experiments including grasping a plastic bottle and squeezing a tennis ball are implemented to verify the efficiency of the proposed system using the developed glove. As a result, it accurately estimates the forces applied by each finger with the aim of achieving a secure grasp comparison with conventional methods.

DOI： 10.1109/ICMA57826.2023.10215914

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85170821953&origin=inward

変形性膝関節症患者の立ち上がり動作時の関節角度に対する膝装具の効果査読有り

山本裕晃, 岡松将吾, 北川広大, 和田親宗

日本義肢装具学会誌 ( 日本義肢装具学会 ) 39 ( 3 ) 219 - 224 2023年07月

担当区分：最終著者記述言語：日本語掲載種別：研究論文（学術雑誌）

軟性膝装具の装着圧力の変化が，変形性膝関節症患者の立ち上がり動作に与える影響を調べた．対象は，変形性膝関節症患者7名とした．異なる装着圧力の軟性膝装具を使用し，立ち上がり動作離殿時の膝関節屈曲角度を分析した．立ち上がり動作離殿時の膝関節屈曲角度は，Control条件と比較してHigh Pressure条件にて有意に大きくなり，装着圧力を高くすることにより増加傾向を示した．軟性膝装具の装着圧力を高くすることにより，立ち上がり動作離殿時の膝関節屈曲角度が大きくなり，効率的な立ち上がり動作が遂行できることが明らかとなった．

DOI： 10.11267/jspo.39.219

Method for improving GPS high-positioning using microwave absorbers for walking movement support 査読有り国際誌

Takashi ASAKAWA, Haruka MATOBA, Daiki HORIMOTO, Chikamune WADA

Mechanical Engineering Letters ( The Japan Society of Mechanical Engineers ) 9 ( 0 ) 23-00125 - 23-00125 23-00125 2023年05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）

This paper describes a method to eliminate multipath effects by using the shield cover of a microwave absorber to improve Global Positioning System (GPS) positioning accuracy. We studied a walking movement support system for visually impaired people. The system provides audio guidance regarding the direction of movement and pedestrian signals based on the location of the intersection and the pedestrian’s GPS position. Because a pedestrian device is a wearable terminal, we want to obtain highly accurate location information with a simple mechanism that can be comfortably worn on the body. In this study, we propose a method using a shielding cover with a microwave absorber to improve the GPS positioning accuracy in environments where multipath, a major cause of positioning error, occurs. This method does not require any modification to the hardware or software of the GPS receiver, and the multipath is prevented by adjusting only the height and position of the shielding cover. In a walking experiment using the proposed method, we confirmed that the shielding plate, set at an open angle of 90 degrees, can provide positioning without being affected by multipath in an environment where there are buildings on both sides of the path.

DOI： 10.1299/mel.23-00125

その他リンク： https://www.jstage.jst.go.jp/article/mel/9/0/9_23-00125/_pdf

Development of Hallux Valgus Classification Using Digital Foot Images with Machine Learning 査読有り国際誌

Mitsumasa Hida, Shinji Eto, Chikamune Wada, Kodai Kitagawa, Masakazu Imaoka, Misa Nakamura, Ryota Imai, Takanari Kubo, Takao Inoue, Keiko Sakai, Junya Orui, Fumie Tazaki, Masatoshi Takeda, Ayuna Hasegawa, Kota Yamasaka, Hidetoshi Nakao

Life 2023 13 ( 5 ) 1146 2023年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

Hallux valgus, a frequently seen foot deformity, requires early detection to prevent it from becoming more severe. It is a medical economic problem, so a means of quickly distinguishing it would be helpful. We designed and investigated the accuracy of an early version of a tool for screening hallux valgus using machine learning. The tool would ascertain whether patients had hallux valgus by analyzing pictures of their feet. In this study, 507 images of feet were used for machine learning. Image preprocessing was conducted using the comparatively simple pattern A (rescaling, angle adjustment, and trimming) and slightly more complicated pattern B (same, plus vertical flip, binary formatting, and edge emphasis). This study used the VGG16 convolutional neural network. Pattern B machine learning was more accurate than pattern A. In our early model, Pattern A achieved 0.62 for accuracy, 0.56 for precision, 0.94 for recall, and 0.71 for F1 score. As for Pattern B, the scores were 0.79, 0.77, 0.96, and 0.86, respectively. Machine learning was sufficiently accurate to distinguish foot images between feet with hallux valgus and normal feet. With further refinement, this tool could be used for the easy screening of hallux valgus.

DOI： 10.3390/life13051146

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85160279187&origin=inward

Improved YOLOv5-Based Lightweight Object Detection Algorithm for People with Visual Impairment to Detect Buses 査読有り国際誌

Rio Arifando, Shinji Eto, Chikamune Wada

Appl. Sci. 2023 13 ( 9 ) 5802 2023年05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）

Object detection is crucial for individuals with visual impairment, especially when waiting for a bus. In this study, we propose a lightweight and highly accurate bus detection model based on an improved version of the YOLOv5 model. We propose integrating the GhostConv and C3Ghost Modules into the YOLOv5 network to reduce the number of parameters and floating-point operations per second (FLOPs), ensuring detection accuracy while reducing the model parameters. Following that, we added the SimSPPF module to replace the SPPF in the YOLOv5 backbone for increased computational efficiency and accurate object detection capabilities. Finally, we developed a Slim scale detection model by modifying the original YOLOv5 structure in order to make the model more efficient and faster, which is critical for real-time object detection applications. According to the experimental results, the Improved-YOLOv5 outperforms the original YOLOv5 in terms of the precision, recall, and mAP@0.5. Further analysis of the model complexity reveals that the Improved-YOLOv5 is more efficient due to fewer FLOPS, with fewer parameters, less memory usage, and faster inference time capabilities. The proposed model is smaller and more feasible to implement in resource-constrained mobile devices and a promising option for bus detection systems.

DOI： 10.3390/app13095802

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85159346654&origin=inward

Compressive and Shear Forces of L5/S1 during Patient Transfer in Different Loads on Hands 査読有り国際誌

Kodai Kitagawa, Hayato Nodagashira, Tadateru Kurosawa, Hinako Maeyama, Chikamune Wada

International Journal of Pharma Medicine and Biological Sciences 12 ( 2 ) 21 - 25 2023年04月

Orientation-based classification of sit-to-stand activity using Artificial Neural Network in real-time 査読有り国際誌

Romy Budhi Widodo, Hanfrey Djaya Winataharto, Mochamad Subianto, Rudy Setiawan, Joseph Dedy Irawan, Chikamune Wada

World Journal of Advanced Research and Reviews 17 ( 3 ) 307 - 317 2023年03月

感覚取り入れ型課題遂行時におけるフロー状態と自律神経系活動査読有り

倉岡宏幸,和田親宗,三宅晋司

産業保健人間工学 23 ( 1 ) 15 - 24 2023年02月

Improvement of Physical Activity Estimation Using the Inertial Measurement Unit based Cane Measurement Device 査読有り国際誌

Takanori Yoshida, Chikamune Wada

Journal of Mechanical and Electrical Intelligent System 6 ( 1 ) 31 - 44 2023年01月

Improving Fall Detection Devices for Older Adults Using Quality Function Deployment (QFD) Approach 査読有り国際誌

Kawthar Abdul Rahman, Siti Anom Ahmad(UPM), Azura Che Soh, Asmidawati Ashari, Chikamune Wada, Alpha Agape Gopalai

Gerontology and Geriatric Medicine 9 1 - 10 2023年01月

Effects of Foot Placements on Lumbar Loads in Patient Transfer Motion: Comparison between Anteroposterior and Mediolateral Placements 査読有り

Kitagawa K., Nodagashira H., Kurosawa T., Maeyama H., Wada C.

GCCE 2023 - 2023 IEEE 12th Global Conference on Consumer Electronics 255 - 256 2023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（国際会議プロシーディングス）

Many caregivers experienced lower back injuries by patient transfer motion. Patient transfer motion causes lumbar load since this task requires lifting and twisting. For this problem, previous studies explored the suitable posture such as trunk angle to reduce lumbar load in patient transfer motion. However, it is difficult to adjust these postures for caregivers because these postures should be dynamically adjusted in patient transfer motion. Thus, we focus on initial foot placement to reduce lumbar load, because initial foot placement is adjustable before starting transfer. Therefore, the objective of this study is to find suitable initial foot placement for patient transfer motion. In the experiment, 10 healthy males performed simulated patient transfer motion with anteroposterior (AP) and mediolateral (ML) foot placement. Erector spinae muscle activity was measured during patient transfer by the surface electromyography (sEMG). Furthermore, compressive force of L4-L5 was calculated by the computational musculoskeletal simulator. The results showed that AP foot placement provided smaller compressive force of L4-L5 than ML. On the other hand, there was no significant difference for erector spinae muscle activity between AP and ML foot placement. These findings will contribute to determining suitable initial posture to prevent lower back injuries in patient transfer motion.

DOI： 10.1109/GCCE59613.2023.10315426

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85179762746&origin=inward

Night-time Validity Evaluation of Neural Network Model for Assisting Visually Impaired 査読有り国際誌

Shinji Eto, Yasuhiro Wada, Chikamune Wada

10th International Symposium on Applied Engineering and Sciences paper ID: C20 2022年12月

Performance Analysis of YOLOv5 Versions for Bus Detection System to Assist Visually Impaired People in Waiting for The Bus 査読有り国際誌

Rio Arifando, Chikamune Wada

10th International Symposium on Applied Engineering and Sciences paper ID: B14 2022年12月

Study of wobble induction using VR glasses 査読有り国際誌

Tomomasa Ohara, Chikamune Wada

10th International Symposium on Applied Engineering and Sciences paper ID: C000164 2022年12月

IMU-based activity recognition of a spinal orthosis user 査読有り国際誌

Takanori Yoshida, Mizuho Ogata, Sonoda Ren, Yuji Katae, Chikamune Wada

10th International Symposium on Applied Engineering and Sciences paper ID: C000112 2022年12月

Artificial Neural Network for Prediction of Vertebral Force during Manual Lifting using 2D Digital Image 査読有り国際誌

Kodai Kitagawa, Chikamune Wada, Mitsumasa Hida, Hiroaki Yamamoto

10th International Symposium on Applied Engineering and Sciences paper ID: C000007 2022年12月

Combination of Gradient Boosting and Gaussian Process for Foot Placement Prediction using Wearable Sensors 査読有り国際誌

Kodai Kitagawa, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

10th International Symposium on Applied Engineering and Sciences paper ID: C000020 2022年12月

Foot Placement and Arm Movement Combination while Turning Patients to Prevent Lower Back Pain 査読有り国際誌

Kodai Kitagawa, Koji Matsumoto, Hayato Nodagashira, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

International Journal of Human Movement and Sports Sciences 10 ( 5 ) 1060 - 1066 2022年10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）

Nurses and caregivers experienced lower back pain (LBP) as a result of patient handling motions to assist in wheelchair or bed transfer and repositioning. Therefore, previous studies provided assistive tools and devices to reduce lumbar loads while these patients handling motions. However, these devices and tools could not be used in several facilities because these facilities require comfortability, time efficiency, and low cost. Therefore, from these backgrounds, LBP prevention is required for any facility and situation without assistive devices and tools. Low load posture and movement of patient handling motions should be provided for LBP prevention without devices and tools. In our previous study, we explored suitable foot placement to reduce the lumbar load during turning a patient on a bed because patient repositioning on a bed is a serious cause of LBP. However, our previous study indicates that lumbar loads while turning patients cannot be improved only by foot placement adjustment. Postural asymmetry is related to lumbar load and cannot be avoided with only suitable foot placement. On the other hand, adjustment of both arm movement and foot placement has a possibility that reduces lumbar loads due to asymmetry posture. This study aims to explore a suitable combination of foot placement and arm movement order while turning patients for LBP prevention. A total of nine lumbar load combinations consisting of three foot placements (parallel stance, left forward, and right forward) and three arm movement orders (parallel, right first, and left first) were investigated via surface electromyography (sEMG) measurement during patient turning. The results of sEMG showed that a combination using anteroposterior foot placement (right forward) and parallel arm movement (both left and right arm operated at the same time) performed turning patient with the smallest activity for both left and right erector spinae muscles. These results indicate that a combination of anteroposterior foot placement and parallel arm movement could provide a suitable posture to reduce lumbar loads during patient turning.

DOI： 10.13189/saj.2022.100524

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85141204251&origin=inward

Fall and Balance Detection System for Older Persons using Blynk Application 査読有り国際誌

Shalini Murugasen, Siti Anom Ahmad, Kawthar Abdul Rahman, Azura Che Soh, Asmidawati Ashari, Chikamune Wada, Alpha Agape Gopalai

The National Conference on Ageing 2022 27 - 28 2022年10月

A survey of physical and occupational therapists’ views on lumbar loading movements 査読有り国際誌

Zenmyou Yuta, Kawakami Kei, Goto Masaki, Watanabe Kazuya, Okamoto Nobuhiro, Yoshida Mariko, Yamamoto Hiroaki, Wada Chikamune

Ｊ　Ｐｈｙｓ　Ｔｈｅｒ　Ｓｃｉ ( 理学療法科学学会 ) 34 ( 10 ) 683 - 688 2022年10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）

[Purpose] To identify the lumbar loading movements necessary in clinical practice. [Participants and Methods] A questionnaire survey was conducted among physical and occupational therapists in Japan. There were no exclusion criteria regarding the number of years of experience, age, or field of employment. The participants were randomly selected and administered the questionnaire. They were asked to list and rank the lumbar loadings they considered necessary. [Results] A total of 739 respondents participated in the survey. The results of this nationwide survey indicated that the lifting movement of heavy objects in the trunk flexion position was the most common movement (for 354 participants). [Conclusion] The main loading movements of the lumbar spine were reported to be heavy lifting movements (in the trunk flexion position) and trunk rotation movements. As perspectives, we aim to conduct an analytical study of some of lumbar spine loading movements outlined in this study, using a musculoskeletal simulator and electromyography.

DOI： 10.1589/jpts.34.683

その他リンク： https://www.jstage.jst.go.jp/article/jpts/34/10/34_2022-048/_pdf

残存機能を活用した立ち座り動作支援機器における適正アシスト力の選定と評価査読有り

三上隼人, 土谷圭央, 田中孝之, 和田親宗

産業応用工学会論文誌 ( 一般社団法人産業応用工学会 ) 10 ( 2 ) 82 - 89 2022年09月

担当区分：最終著者記述言語：日本語掲載種別：研究論文（学術雑誌）

Supporting the elderly by utilizing their remaining functions will lead to the extension of their healthy life span. In this study, we developed a portable cane-type standing and sitting positional mobility support device. In this study, we developed a cane-type mobility support device, and selected a suitable support direction for elderly people by dynamic analysis simulation. In addition, the necessary assisting force for the elderly was examined and the assisting force was set. The effectiveness of the device was evaluated by measuring the surface electromyogram of healthy subjects. As a result, it was found that the specifications of this device were effective when the assist direction was 30 degrees and the assist force was 110 N. From the measurement of the surface electromyogram, it was found that the device was effective for both standing and sitting motions. It also helps to ensure the safety of the sitting motion of elderly people.

DOI： 10.12792/jjiiae.10.2.82

Effect of Knee Orthosis on Lateral Thrust in Patients with Knee Osteoarthritis 査読有り国際誌

Yamamoto H., Endo M., Baba T., Wada C.

Advances in Science, Technology and Engineering Systems Journal 7 ( 5 ) 41 - 45 2022年09月

変形性膝関節症患者の関節位置覚に対する膝装具の効果　―装具の装着圧力に着目した解析― 査読有り

山本裕晃, 岡松将吾, 北川広大, 和田親宗

リハビリテーション・エンジニアリング ( 一般社団法人日本リハビリテーション工学協会 ) 37 ( 2 ) 91 - 96 2022年05月

担当区分：最終著者記述言語：日本語掲載種別：研究論文（学術雑誌）

変形性膝関節症患者は、膝装具装着により関節位置覚が改善することが報告されているが、面ファスナーの締め具合を示す装着圧力には着目されていないことが多い。装着により局所圧迫の神経生理学的な効果が得られているため、装着圧力を高めることにより、さらに関節位置覚が改善する可能性がある。そこで、本研究は変形性膝関節症患者を対象に膝装具の装着圧力に着目し、関節位置覚に与える影響を検証した。結果より、膝関節屈曲60°においては、High PressureがControlと比較して有意に低い値を示した（p ＜ 0.05）。軟性膝装具の装着圧力を高くすることにより、関節位置覚が向上する可能性が示唆された。

DOI： 10.24691/resja.37.2_91

その他リンク： https://search.jamas.or.jp/link/ui/2022258612

Identification of the cause of fall during the pre-impact fall period 査読有り国際誌

Sasaki Sho, Yamamoto Hiroaki, Kitagawa Kodai, Wada Chikamune

Ｊ　Ｐｈｙｓ　Ｔｈｅｒ　Ｓｃｉ ( 理学療法科学学会 ) 34 ( 4 ) 320 - 326 2022年04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）

[Purpose] This study aimed to develop and validate a method for identifying factors that may cause a fall during the pre-impact fall period using wearable sensors. [Participants and Methods] The participants were 23 young people from the public data set (mean age, 23.4 years). Acceleration and angular velocity information obtained from sensors attached to the participant’s waist was used to generate the pre-impact fall. The cause of the fall (slip, trip, fainting, get up, sit down) was then classified with and without the addition of activity of daily living data using three different support vector machine. In addition, we investigated the influence of lead time (0–2.0s) on accuracy. [Results] The quadratic and cubic support vector machine identified the activity of daily living and fall patterns more accurately than the linear support vector machine, and the cubic support vector machine was better for classification, although the difference was slight. The greatest accuracy for predicting the cause of the fall (87.9%) was obtained when the cubic support vector machine was used, activity of daily living was factored into the analysis, and the lead time was 0.25 sec. [Conclusion] Support vector machine can identify the cause of the fall during the pre-impact fall period. Appropriate individualized interventions may be designed based on the most likely cause of fall as identified by this analysis method.

DOI： 10.1589/jpts.34.320

その他リンク： https://search.jamas.or.jp/link/ui/2022326094

Examination of knee orthosis for knee osteoarthritis using gait analysis 査読有り国際誌

Hiroaki Yamamoto, Masahide Endo, Tomohiro Baba, Chikamune Wada

2022 IEEE 4th Global Conference on Life Sciences and Technologies (IEEE LifeTech2022) 617 - 619 2022年03月

Automatic Gait Classification using Arm Acceleration based on Stature and Gait Speed 査読有り国際誌

Kitagawa K., Wada C., Toya N.

LifeTech 2022 - 2022 IEEE 4th Global Conference on Life Sciences and Technologies 636 - 637 2022年03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）

Unsuitable foot clearance and step length lead falling accidents; thus, these gait parameters should be monitored for fall prevention. According to previous study, users prefer wrist as a position to wear wearable device for daily gait monitoring. Therefore, we have been developing gait monitoring method using wearable device on a wrist. Our previous method classifies gaits with different foot clearance or step length by machine learning technique using 3-axis acceleration data obtained from wearable device on a wrist. The results of our previous study showed that this method could classify gaits for each step. However, accuracy of our previous method was insufficient because individual difference of arm acceleration due to stature or gait speed were not considered. The objective of this study is to propose the gait classification method based on individual difference. The proposed method classifies three gaits with different foot clearance and step length by machine learning technique using combination of arm acceleration, stature, and gait speed. The proposed method was tested for 1800 steps performed from ten participants. The proposed method could classify three gaits with accuracy greater than 0.9. These results indicate possibility that the proposed method can be used for gait monitoring using wearable device.

DOI： 10.1109/LifeTech53646.2022.9754855

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85129225443&origin=inward

聴覚障害者や難聴者の方々の胃部Ｘ線検査受診における胃部Ｘ線検査支援システムの有用性について査読有り

宮田充, 和田親宗, 小林俊哉

日本診療放射線技師会誌 69 ( 832 ) 22 - 29 2022年02月

Effect of Knee Orthosis Pressure Variation on Muscle Activities during Sit-to-Stand Motion in Patients with Knee Osteoarthritis 招待有り査読有り国際誌

Yamamoto H., Okamatsu S., Kitagawa K., Wada C.

International Journal of Environmental Research and Public Health 19 ( 3 ) 2022年02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）

It is yet not known whether the variation in knee orthotics pressure would lead to changes in muscle activity during-sit-to-stand postural transition in patients with knee osteoarthritis (OA). Participants in this analytical study were patients with knee OA. The research design was a cross-sectional study. They were enrolled in the study through a sample of convenience method. The primary outcome measure was surface electromyography for measuring muscle activity while changing knee orthotics pressure during sit-to-stand motion. Data were summarized with mean and standard devia-tion while Friedman’s test was performed for multiple comparison of variables, at a significance level of p = 0.05. Seven elderly patients with knee osteoarthritis (mean age 71.4 ± 11.8 years) participated in the study. Moderate orthotics (7.3 mmHg) led to a significant increase in the percentage maximum voluntary contraction (MVC) of tibialis anterior compared to that obtained without orthotics. Rectus femoris, vastus medialis, vastus lateralis, and biceps femoris tended to increase the % MVC with an increase in wearing pressure. It was therefore concluded that the muscle activity during sit-to-stand motion could be increased in patients with knee osteoarthritis by wearing flexible orthotics with varying pressure.

DOI： 10.3390/ijerph19031341

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85123280138&origin=inward

Human Location Estimation using a Monocular Camera for the Support of the Visually Impaired 査読有り国際誌

Takanori Yoshida, Ibai Gorordo Fernandez, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 213 2021年12月

Measurement of gait parameters using a stereo camera 査読有り国際誌

Ryoya Tanaka, Ibai Gorordo Fernandez, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 222 2021年12月

Low-light image enhancement for camera-based assistive device of the visually impaired 査読有り国際誌

Shinji Eto, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 485 2021年12月

Study on Ground Reaction Force Estimation Using 2D Image Information 査読有り国際誌

Kaoru Kinoshita, Shogo Okamatsu, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 230 2021年12月

Development of standing-up support device to encourage the use of residual ability ~ Posture estimation when standing using seat pressure~ 査読有り国際誌

Yudai Murakami, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 227 2021年12月

Classification of Causes of Falls using Machine Learning in Pre-impact Fall State 査読有り国際誌

Sho Sasaki, Hiroaki Yamamoto, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 224 2021年12月

Tactile Tile Detection Method by RGB Channels Exchanging 査読有り国際誌

Yuma Akinaga, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 225 2021年12月

Transfer Learning-based Camera Viewpoint Identification for Assistive System to Bus-waiting 査読有り国際誌

Hiroki Sugino, Ibai Gorordo Fernandez, Watcharin Tangsuksant, Kodai Kitagawa, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 625 2021年12月

Remote vascular dilatation by nitric monoxide generated by acupuncture/moxibustion stimulation 査読有り国際誌

Tetsuya Yoneda, Takeshi Yamakawa, Chikamune Wada

9th International Symposium on Applied Engineering and Sciences paper ID: 231 2021年12月

立ち上がり動作における軟性膝装具の装着圧力の時間的変化査読有り

山本裕晃, 岡松将吾, 北川広大, 和田親宗

理学療法科学 36 859 - 863 2021年12月

Modeling of the Vasorelaxation Mechanism by Acupuncture/Moxibustion Stimulation for Preventing Arteriosclerosis -Review Paper- 査読有り国際誌

Tetsuya Yoneda, Takeshi Yamakawa, Chikamune Wada

International Journal of Innovative Computing, Information and Control ( ICIC International 学会 ) 17 ( 6 ) 1989 - 2017 2021年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Arteriosclerosis requires early detection and treatment. However, its treatment remains insufficiently established. Elucidating the mechanisms of vasorelaxation may lead to early treatment and contribute to the prevention of diseases caused by arteriosclerosis. The ability of acupuncture/moxibustion stimulation to temporarily increase vasorelaxation and vascular flow has been extensively reported, but its mechanism remains unknown. We successfully modeled the mechanism starting from acupuncture/moxibustion stimulation to vasorelaxation/vasodilation by collating the results of numerous studies in various fields, such as medicine, biology, neurosciences, and pharmacology. Ion channels, including transient receptor potential (TRP) channels, exist at free nerve endings. Acupuncture/moxibustion stimulation is sensed by its ion channels and generates nitric oxide in three subsequent pathways, which leads to vasorelaxation. The three pathways are 1) the nNOS activity pathway (based on neural information), 2) eNOS activity pathway (based on vascular wall shear stress), and 3) iNOS activity pathway (based on multiple cytokines produced by macrophages). These pathways differ depending on the external stimulus; however, in each case, they lead to vasorelaxation and contribute to arteriosclerosis prevention. These pathways can be expected to create complex circuits and produce sustained stimulation effects. This model is expected to contribute to the expansion of the research fields and improvement of treatment methods for medical professionals.

DOI： 10.24507/ijicic.17.06.1989

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85121680825&origin=inward

Foot Clearance Prediction Using Wrist Position: A Pilot Study Via Public Dataset 査読有り国際誌

Kodai Kitagawa, Chikamune Wada, Nobuyuki Toya

43rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society 5195 2021年11月

Suitable Combination of Bed Height and Foot Position for Turning Patient on a Bed 査読有り国際誌

Kodai Kitagawa, Kotaro Yamamoto, Chikamune Wada

43rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society 5194 2021年11月

Relationship between Wearing Pressure of Flexible Knee Orthosis and Muscle Activity during Standing-up: A Pilot Study for Knee Osteoarthritis Patient 査読有り国際誌

Hiroaki Yamamoto, Shogo OKAMATSU, Kodai KITAGAWA, Chikamune WADA

The 18th International Society for Prosthetics and Orthotics 196 2021年11月

Study on Tactile Tile Detection Algorithm for Walking Guidance System on Nighttime Crosswalks 査読有り国際誌

Shinji Eto, Chikamune Wada

15th International collaboration Symposium on Information, Production and Systems (ISIPS 2021) C2-1 2021年11月

Comparison of Sensor Position for Abnormal Gait Detector using an Inertial Measurement Unit 査読有り国際誌

Go Eto, Ibai Fernandez, Kodai Kitagawa, Siti Anom Ahmad, Chikamune Wada

15th International collaboration Symposium on Information, Production and Systems (ISIPS 2021) D1-4 2021年11月

Evaluation of Spine Fixation via Spinal Orthosis during Picking-up Motion using Wearable Flex Sensor 査読有り国際誌

Tatsuya Onishi, Ibai Gorordo Fernandez, Kodai Kitagawa, Yuji Katae, Naoki Chijiwa, Takahito Oda, Aki Kuwazono, Hisashi Arizono, Chikamune Wada

15th International collaboration Symposium on Information, Production and Systems (ISIPS 2021) D2-2 2021年11月

Movement Guidance Device in Indoor Environment using Inertial Sensor 査読有り国際誌

Haoran Wang, Ibai Gorordo Fernandez, Kodai Kitagawa, Chikamune Wada

15th International collaboration Symposium on Information, Production and Systems (ISIPS 2021) D2-4 2021年11月

Foot position measurement during assistive motion for sit-to-stand using a single inertial sensor and shoe-type force sensors 査読有り

Kitagawa K., Fernandez I.G., Nagasaki T., Nakano S., Hida M., Okamatsu S., Wada C.

International Journal of Environmental Research and Public Health 18 ( 19 ) 2021年10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）

Assistive motion for sit-to-stand causes lower back pain (LBP) among caregivers. Considering previous studies that showed that foot position adjustment could reduce lumbar load during assistive motion for sit-to-stand, quantitative monitoring of and instructions on foot position could contribute toward reducing LBP among caregivers. The present study proposes and evaluates a new method for the quantitative measurement of foot position during assistive motion for sit-to-stand using a few wearable sensors that are not limited to the measurement area. The proposed method measures quantitative foot position (anteroposterior and mediolateral distance between both feet) through a machine learning technique using features obtained from only a single inertial sensor on the trunk and shoe-type force sensors. During the experiment, the accuracy of the proposed method was investigated by comparing the obtained values with those from an optical motion capture system. The results showed that the proposed method produced only minor errors (less than 6.5% of body height) when measuring foot position during assistive motion for sit-to-stand. Furthermore, Bland–Altman plots suggested no fixed errors between the proposed method and the optical motion capture system. These results suggest that the proposed method could be utilized for measuring foot position during assistive motion for sit-to-stand.

DOI： 10.3390/ijerph181910481

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85116431782&origin=inward

Comparison of Predictors to Estimate Lumbar Muscle Activity Using a Single Inertial Sensor During Patient Handling 査読有り国際誌

Kodai Kitagawa, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

2021 IEEE 10th Global Conference on Consumer Electronics 445 - 446 2021年10月

Relationship between Foot Position and Lumbar Loads while Turning Patients on a Bed: An Investigation via Computational Simulation and Electromyography 査読有り国際誌

Kitagawa K., Yamamoto K., Wada C.

International journal of online and biomedical engineering 17 ( 10 ) 131 - 143 2021年10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）

Caregivers have lower back pain (LBP) since they must reposition patients in bed frequently. Thus, the low lumbar load posture for turning patients should be explored. In this study, we focused on foot position because it can be easily adjusted to reduce back pain. The hypothesis was that short anteroposterior foot distance could reduce lumbar loads because closer position to patient made smaller moments. Therefore, this study aimed to investigate the relationship between foot position and lumbar loads while turning patients on beds. Furthermore, we compared compression stresses of L4–L5 via computational simulation and erector spinae muscle activities obtained from electromyography (EMG) in nine foot positions. The results showed that short anteroposterior foot distance reduced lumbar loads while turning a patient on a bed.

DOI： 10.3991/ijoe.v17i10.25161

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85118648130&origin=inward

Knee joint angle sensing in healthy young adults using flexible orthosis with different wearing pressure 査読有り国際誌

Yamamoto Hiroaki, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 33 ( 7 ) 537 - 539 2021年07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] To investigate the effects of a flexible brace, by analyzing whether its usage; the difference in wearing pressure could change the joint position sensation in healthy participants; and develop a flexible knee brace for patients with knee osteoarthritis. [Participants and Methods] The study included eight healthy males with 14 knee joints (mean age, 22.0 ± 3.1 years). To measure joint position sense, an "angle reproduction test" was performed in three experimental conditions: 1) participants not wearing the brace, 2) the brace was secured with an appropriate force, and 3) the brace was fully secured using hook-and-loop fasteners. [Results] No significant difference was observed among groups comprising of those not wearing, those wearing with the standard force, and those wearing with the tight force. When the maximum hook-and-loop fastener was squeezed, the sensory error in joint position was maximized at both 30° and 60° flexion. [Conclusion] Joint position sense improvement was confirmed to be poor by orthosis, and an error occurred in the joint position sense by increasing the wearing pressure in orthosis. In future, measurements should be performed on patients with knee osteoarthritis who have decreased joint position sense and verify the effect of different wearing pressures verified.

DOI： 10.1589/jpts.33.537

その他リンク： https://ci.nii.ac.jp/naid/130008060077

Evaluation Of Wearable Flex Sensor For Spine Angle Measurement During Picking-Up Motion 査読有り国際誌

Tatsuya Onishi, Ibai Gorordo Fernandez, Kodai Kitagawa, Yuji Katae, Naoki Chijiwa, Aki Kuwazono, Hisashi Arizono, Chikamune Wada

17th IEEE-EMBS International Conference on Wearable and Implantable Body Sensor Networks ID736693 (1 page) 2021年07月

Estimation Technique For Vertical Ground Reaction Force Using Inertial Sensor During Nursing Activity 査読有り国際誌

Kodai Kitagawa, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

17th IEEE-EMBS International Conference on Wearable and Implantable Body Sensor Networks ID733830 (1 page) 2021年07月

Measurement Method for Erector Spinae Muscle Activity during Patient Handling Using Inertial Sensor and Shoe-type Force Sensor 査読有り

Kitagawa K., Matsumoto K., Iwanaga K., Ahmad S.A., Nagasaki T., Nakano S., Hida M., Okamatsu S., Wada C.

International Journal of Electrical and Electronic Engineering and Telecommunications 10 ( 4 ) 283 - 287 2021年07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）

Because caregivers often experience lower back pain caused by lumbar load from patient handling, monitoring this load can help prevent pain. Erector spinae muscle activity, which is measured and monitored as lumbar load, is commonly measured by electromyography (EMG). However, EMG's electrodes can cause skin irritation and be uncomfortable. Therefore, measuring muscle activity without electrodes is necessary. In this study, we propose a method for estimating erector spinae muscle activity using wearable sensors, specifically inertial and shoe-type force sensors. Inertial sensors measure acceleration and angular velocity of the trunk. Shoe-type force sensors measure vertical force of the feet. A regression model obtained from a machine learning algorithm can predict erector spinae muscle activity using inertial and force data. In our experiment, we evaluated the accuracy of our method by comparing sensor data with surface EMG data in patient handling. Results show that this method can measure erector spinae muscle activity with a small error (less than 5% maximal voluntary contractions) and a significantly high correlation with actual value (r = 0.891, p <0.05). In addition, a Bland-Altman plot showed no fixed and proportional errors. These findings indicate that our proposed method can accurately monitor the lumbar loads of caregivers.

DOI： 10.18178/ijeetc.10.4.283-287

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85109441818&origin=inward

理学療法学科初年次学生の装具に関する認識　─計量テキスト分析による解析─ 査読有り

山本裕晃, 北川広大, 和田親宗

理学療法福岡 34 120 - 123 2021年05月

Coronal Spinal Postural Alignment Screening Tool Using Markerless Digital Photography 査読有り国際誌

Mitsumasa Hida, Ayuna Hasegawa, Sachiyo Kamitani, Yumi Kamitani, Kodai Kitagawa, Shogo Okamatsu, Seigo Minami, Tadasuke Ohnishi, Chikamune Wada

Advances in Science, Technology and Engineering Systems Journal, 6 ( 2 ) 965 - 970 2021年04月

Comparison of machine learning algorithms for patient handling recognition based on body mechanics 査読有り

Kitagawa K., Nagasaki T., Nakano S., Hida M., Okamatsu S., Wada C.

LifeTech 2021 - 2021 IEEE 3rd Global Conference on Life Sciences and Technologies 77 - 79 2021年03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）

Caregivers have low back pains due to patient handling. Therefore, we have been developing a monitoring system for patient handling designed to prevent low back pains. In this study, we propose a recognition method for patient handling using inertial measurement unit (IMU) and insole pressure sensor for a wearable monitoring system. Our proposed method recognizes recommended body mechanics-based patient handling by machine learning with trunk angle and ground reaction force on feet. Accuracy of the proposed method was evaluated by the experiment in a laboratory environment. Furthermore, accuracies of 7 common algorithms for machine learning are compared for consideration of the most suitable algorithm for the proposed method. Selected 7 algorithms were artificial neural network (ANN), decision tree (DT), k-nearest neighbor (KNN), logistic, random forest (RF), naive Bayes (NB), and support vector machine (SVM). The study participants were 5 young males. Each participant performed a stand assist motion with 2 conditions (natural and body mechanics) 10 trials for each condition. Accuracies were calculated by 10-fold cross validation with 100 data. The results suggested that our proposed method could recognize 2 stand assist motions with high accuracy more than 0.9 of the time in 3 machine learning algorithms. Furthermore, the best algorithm (RF) could recognize 2 stand assist motions with 0.97 accuracy. These results indicated that the proposed method could recognize patient handling motion and could be applied to a monitoring system to prevent low back pain among caregivers. In addition, this study found the best algorithm for patient handling recognition.

DOI： 10.1109/LifeTech52111.2021.9391968

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104614205&origin=inward

Walking cane velocity estimation using a velocity update method 査読有り

Fernandez I.G., Wada C., Ahmad S.A.

LifeTech 2021 - 2021 IEEE 3rd Global Conference on Life Sciences and Technologies 249 - 252 2021年03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）

Walking canes provide a suitable placement for inertial gait analysis systems such as gait velocity estimation. However, previous velocity estimation methods such as the Zero Velocity Update (ZUPT) method, which are designed for foot mounted inertial sensor systems, are not suitable for walking canes. In this study, we propose the use of a modified velocity update method based on the inverted pendulum model to improve the gait velocity estimation of cane users. The results showed that the proposed method resulted in lower Root Mean Square Error (RMSE) values than the ZUPT method for the estimation of the cane velocity, but the results were worse than previous foot mounted systems.

DOI： 10.1109/LifeTech52111.2021.9391813

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104574143&origin=inward

理学療法学生が考える装具管理に必要な知識と技能査読有り

山本裕晃, 和田親宗

リハビリテーション教育研究 27 20 - 25 2021年03月

The Association of Falls with Instability: An Analysis of Perceptions and Expectations toward the Use of Fall Detection Devices Among Older Adults in Malaysia 査読有り

Abdul Rahman K., Ahmad S.A., Che Soh A., Ashari A., Wada C., Gopalai A.A.

Frontiers in Public Health 9 2021年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

Background: Falls are a significant incident among older adults affecting one in every three individuals aged 65 and over. Fall risk increases with age and other factors, namely instability. Recent studies on the use of fall detection devices in the Malaysian community are scarce, despite the necessity to use them. Therefore, this study aimed to investigate the association between the prevalence of falls with instability. This study also presents a survey that explores older adults' perceptions and expectations toward fall detection devices. Methods: A cross-sectional survey was conducted involving 336 community-dwelling older adults aged 50 years and older; based on randomly selected participants. Data were analyzed using quantitative descriptive analysis. Chi-square test was conducted to investigate the associations between self-reported falls with instability, demographic and walking characteristics. Additionally, older adults' perceptions and expectations concerning the use of fall detection devices in their daily lives were explored. Results: The prevalence of falls was 28.9%, where one-quarter of older adults fell at least once in the past 6 months. Participants aged 70 years and older have a higher fall percentage than other groups. The prevalence of falls was significantly associated with instability, age, and walking characteristics. Around 70% of the participants reported having instability issues, of which over half of them fell at least once within 6 months. Almost 65% of the participants have a definite interest in using a fall detection device. Survey results revealed that the most expected features for a fall detection device include: user-friendly, followed by affordably priced, and accurate. Conclusions: The prevalence of falls in community-dwelling older adults is significantly associated with instability. Positive perceptions and informative expectations will be used to develop an enhanced fall detection incorporating balance monitoring system. Our findings demonstrate the need to extend the fall detection device features aiming for fall prevention intervention.

DOI： 10.3389/fpubh.2021.612538

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85101917742&origin=inward

立ち上がり動作における軟性膝装具の装着圧力の時間的変化査読有り

山本裕晃, 岡松将吾, 北川広大, 和田親宗

理学療法科学 ( 理学療法科学学会 ) 36 ( 6 ) 859 - 863 2021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）

〔目的〕軟性膝装具の装着圧力は，動作時に変化せず固定が不十分となるため，動作時に常に固定が得られるように，動的に装着圧力が変化する軟性膝装具が必要となる．本研究はそのような装具開発の基礎研究として，立ち上がり動作時の装着圧力の時間的変化を調べた．〔対象と方法〕対象は，健常若年男性18名とした．異なる装着圧力の軟性膝装具を使用した場合の立ち上がり動作時の装着圧力の時間的変化を調べた．〔結果〕立ち上がり動作の各相における装着圧力の変化において有意差が認められ，殿部離床時に装着圧力が最も大きくなった．また，膝関節屈曲角度に応じて装着圧力が高くなる傾向があった．〔結論〕立ち上がり動作時の軟性膝装具の装着圧力の変化および指標が確認できた．今後は，動的に装着圧力が変化する軟性膝装具の開発を進めていく．

DOI： 10.1589/rika.36.859

その他リンク： https://www.jstage.jst.go.jp/article/rika/36/6/36_859/_pdf

理学療法学科1年次生が装具に対して抱くイメージ

山本裕晃, 北川広大, 和田親宗

理学療法学Supplement ( 公益社団法人日本理学療法士協会 ) 48S1 ( 0 ) B-225_1 - B-225_1 2021年01月

Comparison of Predictors to Estimate Lumbar Muscle Activity using a Single Inertial Sensor during Patient Handling 査読有り国際誌

Kitagawa K., Nagasaki T., Nakano S., Hida M., Okamatsu S., Wada C.

2021 IEEE 10th Global Conference on Consumer Electronics, GCCE 2021 402 - 403 2021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（国際会議プロシーディングス）

Monitoring of lumbar muscle activity during patient handling is important for the preventing lower back pain among caregivers. Electromyography is used for the measurement of muscle activity; however, EMG has some uncomfortable. Therefore, our previous study proposed measurement method for lumbar muscle activity using wearable sensors and found that the combination of wearable sensors and machine learning can be applied to estimate muscle activity. However, optimal machine learning-based predictor has not been explored. In addition, our previous method requires multiple sensors. Thus, this study explores optimal predictors to estimate lumbar muscle activity during patient handling by a single inertial sensor. The proposed method estimates lumbar muscle activity by acceleration and angular velocity on a trunk and machine learning-based predictor. In the evaluation, five machine learning-based predictors (artificial neural network, gaussian process, k-nearest neighbor, linear regression, and support vector machine) estimated lumbar muscle activity during patient handling. Mean absolute error values of lumbar muscle activity between each predictor and EMG were obtained as actual values. Results show that the proposed method using k-nearest neighbor could estimate muscle activity with minimal error. These results suggest that the proposed method using k-nearest neighbor as an optimal predictor can measure lumbar muscle activity.

DOI： 10.1109/GCCE53005.2021.9621882

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85123505938&origin=inward

Development of a Wearable Human Fall Detection System 査読有り国際誌

Azura Che Soh, Noor Ain Kamsani, Raja Mohd Kamil Raja Ahmad, Siti Anom Ahmad, Asnor Juraiza Ishak, Hafiz Rashidi Ramli Harun, Siti Khadijah Ali, Chikamune Wada

ASEAN IVO Forum 2020 Session4-1 2020年12月

Step Length Estimation Based on Arm Accelerations for Wearable Fall Prevention Systems 査読有り

Kodai Kitagawa, Yu Taguchi, Chikamune Wada, Nobuyuki Toya

International Journal of Applied Biomedical Engineering 13 ( 2 ) 29 - 35 2020年12月

Design and evaluation of upper-arm mouse using inertial sensor for human-computer interaction 査読有り

Widodo R.B., Haryasena A.B., Setiawan H., Tirma Irawan P.L., Subianto M., Wada C.

Journal of Engineering Science and Technology 15 ( 6 ) 3673 - 3690 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Pointing devices commonly used today, including the modern computer mouse, can only be operated manually. For people with physical impairments, usage can be problematic due to a limited ability to operate such devices. Therefore, this study was inspired to conduct research on designing and evaluating an appropriate mouse-substitution system for individuals who are physically impaired. The design of the system uses an inertial measurement unit (IMU) that is a fusion of a gyroscope and an accelerometer sensor in which the sensor is attached to a user's upper arm to recognise physical gestures. Any gestures performed by the upper arm are then mapped and used to manipulate mouse cursor movements on computer devices. The design of the “clicking” method uses both an electromyograph (EMG) sensor and a bend sensor. This study evaluates two input devices; one is a combination of an IMU and an EMG sensor, and the other is an input device that is a combination of an IMU and a bend sensor. Fitts' Law formula and the ISO/TS 9241-411: Ergonomics of human-system interaction standard were used to evaluate quantitative performance and level of comfort. The quantitative results show that the average throughput (TP) of the first input device (2.30 bps) differs greatly, statistically, in comparison to the second input device (1.75 bps). Similarly, the average movement time (tm) revealed that there is a statistically significant difference between the first input device (1.98 s) and the second input device (2.67 s). The qualitative results show that the comfort levels of the first input device are superior to those of the second input device. It concludes that the combination of IMU and EMG as a pointing and clicking apparatus revealed better performance than the combination of IMU and bend sensor.

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85097320244&origin=inward

Linear Regression Technique for Improvement of Feet Position Estimation During Standing Balance Using a Cane with Millimeter Wave Radar 査読有り国際誌

Ibai Gorordo Fernandez, Kodai Kitagawa, Kawthar Abdul Rahman, Azura Che Soh, Alpha Agape Gopalai, Siti Anom Ahmad, Chikamune Wada

Pertanika Journal of Science and Technology 28 ( S2 ) 71 - 81 2020年12月

Regression Equation between Required Force and Lumbar Load of Caregiver in Supporting Standing-up Motion via Computational Musculoskeletal Simulation 査読有り国際誌

Kodai Kitagawa, Yoshiki Nishisako, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

Pertanika Journal of Science and Technology 28 ( S2 ) 59 - 70 2020年12月

A Pilot Study on Abnormal Gait Detector using an Inertial Sensor for Fall Prevention System 査読有り国際誌

Go Eto, Ibai Gorordo Fernandez, Kodai Kitagawa, Siti Anom Ahmad, Chikamune Wada

8th International Symposium on Applied Engineering and Sciences E-P2-01 2020年12月

Improving Fall Detection Device using Quality Function Deployment: Development of a Fall Prevention Device 査読有り国際誌

Kawthar Abdul Rahman, Siti Anom Ahmad, Chikamune Wada

8th International Symposium on Applied Engineering and Sciences M-05-07 2020年12月

Relationship between toe contact timing and motor function of the elderly people 査読有り国際誌

Shogo Okamatsu, Kazuaki Tsuji, Kodai Kitagawa, Ibai Gorordo Fernandez, Mitsumasa Hida, Chikamune Wada

8th International Symposium on Applied Engineering and Sciences E-P4-11 2020年12月

Blood flow volume estimation of dialysis patients using body sound sensor and machine learning 査読有り国際誌

Takeshi Joyashiki, Chikamune Wada

8th International Symposium on Applied Engineering and Sciences E-P4-08 2020年12月

A pilot study to investigate the effects of cane length on gait stability 査読有り国際誌

Supanat Sakunwitunthai, Kodai Kitagawa, Ibai Gorordo Fernandez, Siti Anom Ahmad, Chikamune Wada,

8th International Symposium on Applied Engineering and Sciences E-P４-01 2020年12月

Fundamental Study on Prediction Method for Muscle Activity of Caregivers using Inertial Sensor 査読有り国際誌

Kodai Kitagawa, Koji Matsumoto, Kensuke Iwanaga, Siti Anom Ahmad, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

8th International Symposium on Applied Engineering and Sciences E-P3-01 2020年12月

Estimation of Brachial Artery Vascular Resistance Index in Dialysis Patients via Vascular Access Using Body-conducted Sound Sensor (BCS) and Neural Network 査読有り国際誌

Takeshi Joyashiki, Chikamune Wada

14th International collaboration Symposium on Information, Production and Systems D1-5 2020年11月

The Relationship between Crutch Length and Shoulder Load during Double-Crutch Walking 査読有り国際誌

Atsushi Tamura, Yoshiki Nishisako, Kodai Kitagawa,Takayuki Nagasaki, Shogo Okamatsu, Chikamune Wada

4th Global Conference on Biomedical Engineering 260167 2020年11月

Real-time Camera Viewpoint Identification for Assistive System to Bus-waiting Visually Impaired 査読有り国際誌

Hiroki Sugino, Watcharin Tangsuksant, Ibai Gorordo Fernandez, Kodai Kitagawa, Chikamune Wada

4th Global Conference on Biomedical Engineering 260162 2020年11月

Automatic Identification Method of Patient Handling Motion using a Single Inertial Measurement Unit and Machine Learning 査読有り国際誌

Kensuke Iwanaga, Kodai Kitagawa, Chikamune Wada

4th Global Conference on Biomedical Engineering 260100 2020年11月

Relationship between Lumbar Load and Initial Trunk Posture during Postural Change for a Patient on a Bed 査読有り国際誌

Kodai Kitagawa, Koji Matsumoto, Siti Anom Ahmad, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

4th Global Conference on Biomedical Engineering 260050 2020年11月

Walking Guidance System on Crosswalks for the Visually Impaired 査読有り国際誌

Karin Kanemura, Yasuhiro Wada, Tibyani Tibyani, Randy Cahya Wihandika, Chikamune Wada

4th Global Conference on Biomedical Engineering 260269 2020年11月

The Effect of Knee Brace on Sense of Position of Knee Joint－Analysis Focusing on The Mounting Pressure of The Brace－査読有り国際誌

Hiroaki Yamamoto, Chikamune Wada

4th Global Conference on Biomedical Engineering 260017 2020年11月

Measurement of thoracic kyphosis using the cranio-horizontal angle in the supine position 査読有り国際誌

Mitsumasa Hida, Chikamune Wada, Kodai Kitagawa, Shogo Okamatsu, Masakazu Imaoka, Hidetoshi Nakao, Ryota Imai, Tadasuke Ohnishi, Katsumi Hamaoka

Asian Confederation for Physical Therapy Congress 2020 S20200622054953T21B10A 2020年10月

Posture recognition method for caregivers during postural change of a patient on a bed using wearable sensors 査読有り国際誌

Kitagawa K., Matsumoto K., Iwanaga K., Ahmad S.A., Nagasaki T., Nakano S., Hida M., Okamatsu S., Wada C.

Advances in Science, Technology and Engineering Systems 5 ( 5 ) 1093 - 1098 2020年10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）

Caregivers experience lower back pain due to their awkward postures while handling patients. Therefore, a monitoring system to supervise caregivers’ postures using wearable sensors is being developed. This study proposed a postural recognition method for caregivers during postural change while handling a patient on a bed. The proposed method recognizes foot positions and arm movements by a machine learning algorithm using inertial data on the trunk and foot pressure data obtained from wearable sensors. An experiment was conducted to evaluate whether the proposed method could recognize three foot positions and three arm movements. Participants provided postural change for a simulated patient on a bed (patient: supine to lateral recumbent) under nine conditions, including different combinations of the three foot positions and three arm movements; the experiment was repeated ten times for each condition. Experimental results showed that the proposed method using an artificial neural network with all features obtained from an inertial measurement unit and insole pressure sensors could recognize arm movements and foot positions with an accuracy of approximately 0.75 and 0.97, respectively. These results suggest that the proposed method can be used in a monitoring system tracking a caregiver’s posture.

DOI： 10.25046/aj0505133

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85096634583&origin=inward

Inertial sensor-based instrumented cane for real-time walking cane kinematics estimation 査読有り国際誌

Fernandez I.G., Ahmad S.A., Wada C.

Sensors (Switzerland) 20 ( 17 ) 1 - 19 2020年09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）

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Falls are among the main causes of injuries in elderly individuals. Balance and mobility impairment are major indicators of fall risk in this group. The objective of this research was to develop a fall risk feedback system that operates in real time using an inertial sensor-based instrumented cane. Based on inertial sensor data, the proposed system estimates the kinematics (contact phase and orientation) of the cane. First, the contact phase of the cane was estimated by a convolutional neural network. Next, various algorithms for the cane orientation estimation were compared and validated using an optical motion capture system. The proposed cane contact phase prediction model achieved higher accuracy than the previous models. In the cane orientation estimation, the Madgwick filter yielded the best results overall. Finally, the proposed system was able to estimate both the contact phase and orientation in real time in a single-board computer.

DOI： 10.3390/s20174675

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85089517906&origin=inward

Millimeter Wave Radar Simulation for Human Balance Assessment Applications 査読有り

Ibai Gorordo Fernandez, Siti Anom Ahmad, Chikamune Wada

Proceedings of the SICE Annual Conference 2020 912 - 915 2020年09月

3d printed robot hand structure using four-bar linkage mechanism for prosthetic application 査読有り国際誌

Wahit M.A.A., Ahmad S.A., Marhaban M.H., Wada C., Izhar L.I.

Sensors (Switzerland) 20 ( 15 ) 1 - 22 2020年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Trans-radial prosthesis is a wearable device that intends to help amputees under the elbow to replace the function of the missing anatomical segment that resembles an actual human hand. However, there are some challenging aspects faced mainly on the robot hand structural design itself. Improvements are needed as this is closely related to structure efficiency. This paper proposes a robot hand structure with improved features (four-bar linkage mechanism) to overcome the deficiency of using the cable-driven actuated mechanism that leads to less structure durability and inaccurate motion range. Our proposed robot hand structure also took into account the existing design problems such as bulky structure, unindividual actuated finger, incomplete fingers and a lack of finger joints compared to the actual finger in its design. This paper presents the improvements achieved by applying the proposed design such as the use of a four-bar linkage mechanism instead of using the cable-driven mechanism, the size of an average human hand, five-fingers with completed joints where each finger is moved by motor individually, joint protection using a mechanical stopper, detachable finger structure from the palm frame, a structure that has sufficient durability for everyday use and an easy to fabricate structure using 3D printing technology. The four-bar linkage mechanism is the use of the solid linkage that connects the actuator with the structure to allow the structure to move. The durability was investigated using static analysis simulation. The structural details and simulation results were validated through motion capture analysis and load test. The motion analyses towards the 3D printed robot structure show 70%–98% similar motion range capability to the designed structure in the CAD software, and it can withstand up to 1.6 kg load in the simulation and the real test. The improved robot hand structure with optimum durability for prosthetic uses was successfully developed.

DOI： 10.3390/s20154174

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85088777942&origin=inward

Monitoring System for L4/L5 Compression Force during Assistive Motion using Single Inertial Measurement Unit 査読有り

Kodai Kitagawa, Ibai Gorordo Fernandez, You-Chi Li, Kuang-Ming Lin, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Fu-Cheng Wang, Chikamune Wad

The 14th International Conference on Complex Medical Engineering Session 2-8 2020年08月

Evaluation of a Commercial Force Sensor for Real Time Applications 査読有り国際誌

Ahmed M. M. Almassri, Wan Zuha Wan Hasan, Chikamune Wada and Keiichi Horio

ICIC Express Letters, Part B: Applications 11 ( 5 ) 421 - 426 2020年05月

Analysis of Occupational Injury Reports Related to Patient Care Activities using Text Mining Technique 査読有り国際誌

Kodai Kitagawa, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada,

11th Asia Pacific Conference on Medical and Biological Engineering AP2-7-BD-001 2020年05月

Obstacle Height Estimation Related to Suitable Viewpoint while Waiting for the Bus Using Color Moment Technique 査読有り

Watcharin Tangsuksant, Chikamune Wada

International Journal of Machine Learning and Computing 10 ( 3 ) 495 - 500 2020年05月

Analysis of Occupational Injury Reports Related to Patient Care Activities Using Text Mining Technique 査読有り国際誌

Kitagawa K., Nagasaki T., Nakano S., Hida M., Okamatsu S., Wada C.

11th Asia Pacific Conference on Medical and Biological Engineering 82 153 - 158 2020年05月

担当区分：最終著者,　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）

Many caregivers experience occupational injuries due to patient care activities. An analysis of actual occupational injury reports will be effective to prevent such occupational injuries. However, analyzing these reports is difficult because they comprise text data that have not been quantified or standardized. In this study, we employ a text mining technique and analyze 422 occupational injury reports that include the word “patient.” We obtained Severe Injury Reports published by the Occupational Safety and Health Administration. These reports were investigated using cluster analysis and a co-occurrence network based on Jaccard coefficients. The cluster analysis results indicate that are fall accidents could be caused by cords on the floor, finger injuries were associated with doors, and lower back, or neck pain was related to lifting in patient care activities. The generated co-occurrence network showed that fall accidents and lower back injury are common occupational injuries among caregivers. These results indicate the need to prevent fall accidents and lower back pain among caregivers by improving the work environment and workspace strategies, such as cord placement and caregiver postures.

DOI： 10.1007/978-3-030-66169-4_20

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104888519&origin=inward

Shoe Detection Using SSD-MobileNet Architecture 査読有り

Fernandez I.G., Wada C.

LifeTech 2020 - 2020 IEEE 2nd Global Conference on Life Sciences and Technologies 171 - 172 2020年03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）

© 2020 IEEE. Falls are a global health issue that especially affects to the elderly. In our previous research, we used a millimeter wave radar to estimate the position of the feet for fall risk assessment of cane users. Radar sensors have a good accuracy, however, due to its low resolution, it is difficult to know if the radar is really tracking the position of the feet or of any other object. In this research, we present a shoe image detector using SSD-MobileNet architecture that could be used in combination with the radar to accurately track the position of the feet. The results show that the proposed detector could correctly recognize the position of the shoes in an image.

DOI： 10.1109/LifeTech48969.2020.1570618965

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85085162836&origin=inward

Validation of a body-conducted sound sensor for respiratory sound monitoring and a comparison with several sensors 査読有り国際誌

Joyashiki T., Wada C.

Sensors (Switzerland) 20 ( 3 ) 2020年02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）

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. article distributed under the terms and conditions of the Cr. The ideal respiratory sound sensor exhibits high sensitivity, wide-band frequency characteristics, and excellent anti-noise properties. We investigated the body-conducted sound sensor (BCS) and verified its usefulness in respiratory sound monitoring through comparison with an air-coupled microphone (ACM) and acceleration sensor (B & K: 8001). We conducted four experiments for comparison: 1) estimation by equivalent circuit model of sensors and measurement by a sensitivity evaluation system; 2) measurement of tissue-borne sensitivity-to-air-noise sensitivity ratio (SRTA); 3) respiratory sound measurement through a simulator; and 4) actual respiratory sound measurement using human subjects. For 1), the simulation and measured values of all the sensors showed good agreement; BCS demonstrated sensitivity ~10 dB higher than ACM and higher sensitivity in the high-frequency segments compared with 8001. In 2), BCS showed high SRTA in the 600–1000 and 1200–2000-Hz frequency segments. In 3), BCS detected wheezes in the high-frequency segments of the respiratory sound. Finally, in 4), the sensors showed similar characteristics and features in the high-frequency segments as the simulators, where typical breathing sound detection was possible. BCS displayed a higher sensitivity and anti-noise property in high-frequency segments compared with the other sensors and is a useful respiratory sound sensor.

DOI： 10.3390/s20030942

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85079339417&origin=inward

松葉杖長推計法の妥当性の検証と新しい推計法の提案査読有り

永﨑孝之, 二宮省悟, 赤木海斗, 秋山ゆり, 一丸貴代香, 内山優, 工藤孝彦, 近藤佑吏, 菅原菜央, 中尾文香, 平井莉麻, 水上健太, 吉村大輔, 和田親宗

リハビリテーション・エンジニアリング ( 一般社団法人日本リハビリテーション工学協会 ) 35 ( 1 ) 27 - 33 2020年02月

マーカレスなデジタル画像を用いた円背測定手法の提案

肥田光正，和田親宗，岡松将吾，北川広大，大西忠輔，多田康貴，湯川貴史，川島聡史，南征吾，畑中良太

大阪河崎リハビリテーション大学紀要 ( 14 ) 27 - 31 2020年01月

Measurement System for the Clothing Pressure of a Spinal Orthosis using Multiple Pressure Sensors 査読有り国際誌

Koji Sakamoto, Kodai Kitagawa, Yuji Katae, Naoki Chijiwa, Aki Kuwazono, Hisashi Arizono, Chikamune Wada

Journal of Mechanical and Electrical Intelligent System 3 ( 1 ) 1 - 9 2020年01月

松葉杖長推計法の妥当性の検証と新しい推計法の提案査読有り

永﨑孝之，二宮省悟，赤木海斗，秋山ゆり，一丸貴代香，内山優，工藤孝彦，近藤佑吏，菅原菜央，中尾文香，平井莉麻，水上健太，吉村大輔，和田親宗

リハビリテーション・エンジニアリング 35 ( 1 ) 27 - 33 2020年01月

松葉杖歩行時の脊柱側屈と肩関節外転の関係について査読有り

西迫善希, 永﨑孝之, 和田親宗

理学療法科学 ( 理学療法科学学会 ) 35 ( 1 ) 41 - 47 2020年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

〔目的〕筋骨格シミュレータを用いて，松葉杖歩行中に脇当てが腋窩から脱落する要因を検討するために脊柱側屈と肩関節外転の関係を調査した．〔対象と方法〕被験者は，整形外科的疾患を有していない若年成人男性5名とした．まず，3次元動作解析システムを用いて松葉杖歩行中の動きのデータを計測した．次に，得られたデータをもとに筋骨格シミュレータを用いて松葉杖歩行中の脊柱側屈と肩関節外転の関係について調べた．〔結果〕松葉杖立脚期中の足底離地から足底中間点までの間，足底中間点から足底接地までの間，足底接地から松葉杖離地までの間では，脊柱側屈角度変化量と肩関節外転角度変化量に有意な相関がみられた．〔結語〕脊柱側屈と肩関節外転にはある一定の関係があり，松葉杖歩行時の脇当ての腋窩からの脱落に影響する可能性が考えられた．

DOI： 10.1589/rika.35.41

その他リンク： https://ci.nii.ac.jp/naid/130007803151

Reliability of laser-assisted hindfoot alignment evaluation 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 ) 32 ( 1 ) 38 - 41 2020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] A goniometer is frequently used for static measurement of hindfoot alignment. However, although goniometer measurements require experience, their reliability and validity remain controversial. We developed a hindfoot alignment measurement method by laser as an alternative measure. The purpose of this study was to examine the reliability of laser-assisted hindfoot alignment evaluation. [Participants and Methods] Two non-expert examiners (without medical knowledge), briefly trained in the use of laser-assisted hindfoot alignment evaluation, evaluated hindfoot alignment in 12 healthy participants. [Results] The ICC of the intra-rater reliability was 0.74 for both examiners and the ICC for inter-rater reliability was 0.43. [Conclusion] The good intra-rater and moderate inter-rater reliability of laser-assisted hindfoot alignment evaluation, when used by non-professionals, suggest the laser-assisted hindfoot alignment evaluation may be appropriate for use in clinical practice settings.

DOI： 10.1589/jpts.32.38

その他リンク： https://ci.nii.ac.jp/naid/130007789043

Effects of the Characteristics and Duration of Chronic Pain on Psychosomatic Function in the Community-Dwelling Elderly Population 査読有り国際誌

Hida M., Nakamura M., Imaoka M., Nakao H., Tasaki F., Omizu T., Takeda M., Ohnishi T., Wada C.

Pain Research and Management 2020 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Mitsumasa Hida et al. Catastrophic thinking is related to pain intensity and the degree of disability and influences pain care significantly. However, only few studies have investigated the impact of catastrophic thinking on chronic pain (CP) in the community-dwelling elderly population. This study aimed to evaluate the characteristics of CP in the community-dwelling elderly population and to investigate the effects of different periods of CP on cognitive and psychological functions. A total of 187 community-dwelling elderly people met the inclusion criteria and were included in this cross-sectional study. The survey items included demographic data (age and gender), pain-related questionnaires, psychological and cognitive functions, and sleep status. The duration of CP was investigated using three categories: no pain and pain for ≤1 year and ≥1 year. A logistic regression analysis was performed to identify the factors most strongly associated with the presence of CP. The difference in each assessment was compared according to duration of CP among the three groups and analyzed using the chi-square test, Kruskal-Wallis test, and one-way analysis of variance. The PCS scores and depression scores were significantly higher in long duration of CP compared with no pain and pain for ≤1 year. The present study is consistent with the fear-avoidance model and was concluded that community-dwelling elderly people with CP are depressive and tend to magnify their pain with long duration of CP.

DOI： 10.1155/2020/4714527

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85083893367&origin=inward

保健衛生業における労働災害事例のテキストマイニング解析:̶動作の反動・無理な動作による事例を対象として̶ 査読有り

北川広大, 永﨑孝之, 中野聡太, 肥田光正, 岡松将吾, 和田親宗

労働安全衛生研究 ( 独立行政法人労働安全衛生総合研究所 ) 13 ( 2 ) 139 - 143 2020年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

厚生労働省が定めた「第 13 次労働災害防止計画」では，労働災害の件数が減少していない業種等への対策を推進しており，その対象の1つである社会福祉施設では「動作の反動・無理な動作」による労働災害が多い．そこで本研究では，これらの労働災害におけるリスク要因の抽出を目的として，厚生労働省が公開している「労働災害データベース」に収録された計1041例の労働災害事例を調査した．本研究では労働災害事例の発生状況に関する文章記述を対象とし，これらのテキスト情報をテキストマイニング解析によって調査した．テキストマイニング解析では，各頻出語の頻出回数と頻出語同士の共起関係を示す共起ネットワークによって多くの労働災害事例に共通する具体的な状況を考察した．解析結果は「腰」，「ベッド」，「介助」，「痛み」，「移乗」，「患者」，「車椅子」などの語句が多くの事例で頻出，共起していることを示した．この結果から，対象の労働災害事例の多くにベッドや車椅子間の移乗介助による腰痛が発生している可能性が示された．移乗介助による腰痛は平成20年に実施された先行調査においても指摘されているが，本研究の結果を踏まえるとこれらのリスク要因は未だに解決されていないと考えられる．そのため，今後の労働災害対策では移乗介助による腰痛の予防に向けて従来よりも実効性のある解決策を早急に検討する必要があると考える．

DOI： 10.2486/josh.JOSH-2020-0007-TA

その他リンク： https://ci.nii.ac.jp/naid/130007887364

Usefulness of a simulated experience method for transfer assistance for hemiplegia or limited range of motion in multiple joints 査読有り

Nakano Sota, Okada Hirotaka, Higo Shigeyoshi, Nakamura Kouichi, Kitagawa Kodai, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 32 ( 8 ) 541 - 544 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

[Purpose] To further the understanding of dysfunctions to which a simulated experience method could be applied, we clarified whether a simulated experience method can promote caregivers to utilize the abilities of care recipients with pseudo-hemiplegia or pseudo-limited range of motion (ROM) in multiple joints. [Participants and Methods] We studied transfer assistance in 60 nursing assistants from nursing home settings: 30 were assigned to the pseudo-hemiplegia (26 females, 4 males) and limited ROM in multiple joints (27 females, 3 males) groups. One healthy person was fitted with orthotic braces to mimic hemiplegia or limited ROM in multiple joints, each making it difficult to stand-up. Participants were randomized to either a simulated experience group (involving interventional help from a physical therapist between the first and second measurements) or a control group. The load difference on the lower limbs of the care recipient between two rounds of transfer assistance was examined. [Results] The difference between the second and first measurements was −5.9 ± 74.5 N for the control group and 107.9 ± 123.6 N for the simulated experience method in the pseudo-hemiplegia study, and −14.7 ± 64.7 N and 149.1 ± 132.4 N, respectively, for the pseudo-limited ROM-in-multiple-joints study. [Conclusion] The simulated experience method promoted transfer assistance of a care recipient with pseudo-hemiplegia or pseudo-limited ROM in multiple joints. These results suggest that hemiplegia and limited ROM in multiple joints are added as dysfunctions that can be applied to a simulated experience method in transfer assistance.

DOI： 10.1589/jpts.32.541

その他リンク： https://ci.nii.ac.jp/naid/130007886026

Optimal foot-position of caregiver based on muscle activity of lower back and lower limb while providing sit-to-stand support 査読有り

Kitagawa Kodai, Nagasaki Takayuki, Nakano Sota, Hida Mitsumasa, Okamatsu Shogo, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 32 ( 8 ) 534 - 540 2020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] In caregivers, low load posture is necessary to prevent lower back pain during patient handling activities such as sit-to-stand support. This study focused on the foot-position of caregivers as an adjustable and useful parameter. A wide stance decreases the stress on the lumbar vertebra. However, this foot-position increases loading of the spinae erector muscles. The aim of this study was to investigate the relationship of anterior-posterior and lateral-medial distances between feet and activity of the spinae erector muscles to determine the optimal foot-position for reducing stress on the lumbar vertebra without increasing spinae erector muscle load. [Participants and Methods] Five young male participants were asked to provide sit-to-stand support 10 times using nine normalized foot-positions with different anterior-posterior and lateral-medial distances. Surface electromyograms of the erector spinae and lower limb muscles were measured during sit-to-stand support. [Results] The results showed that the optimal foot-position (anterior-posterior 55%, lateral-medial 20% of body height) increased muscle activity within the lower limb muscles compared with the lower back muscles and did not increase loads on the erector spinae muscle. [Conclusion] Optimizing foot-position can reduce stress on the lumbar vertebra without increasing load on the spinae erector muscles.

DOI： 10.1589/jpts.32.534

その他リンク： https://ci.nii.ac.jp/naid/130007886024

自己血管内シャント機能評価を目的とした体導音センサの有用性の検証査読有り

城屋敷健志, 和田親宗

医療機器学 ( 一般社団法人日本医療機器学会 ) 90 ( 5 ) 414 - 422 2020年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

We verified that arteriovenous fistula (AVF) function can be evaluated from shunt sound using a body-conducted sound sensor (BCS) with a wide-band frequency characteristic. In the BCS, we compared two types of sensors: an air-coupled microphone (ACM) and an acceleration sensor (Type 8001). Evaluation for sensors were performed for 36 patients. We also developed a shunt-sound observation system and evaluated it using the spectrogram and power spectrum values obtained using a sound spectrometer. Furthermore, we verified that two indices of ultrasonography information, namely, the resistance index (RI) and flow volume (FV), can be estimated from the shunt sound and classified through machine learning. The BCS detected the shunt sound signal in the spectrogram over a wide frequency band. The sensitivities of the BCS in the non-amplified detection of stenosis sound signals were 0.93/0.92 (below 1 kHz/above 1 kHz, respectively), surpassing those of other sensors(ACM: 0.82/0.77, Type 8001: 0.82/0.25). Furthermore, the highest machine learning accuracy was obtained using BCS in the classification segments of RI > 0.60, 0.65, and 0.70 and FV < 350 ml/min. BCS is particularly suitable for detecting stenosis sounds of over 1 kHz and estimating RI and is considered to be suitable for functional evaluations of AVF.

DOI： 10.4286/jjmi.90.414

その他リンク： https://ci.nii.ac.jp/naid/130007958314

Spinal postural alignment measurements using markerless digital photography 査読有り国際誌

Hida M., Wada C., Imai R., Kitagawa K., Okamatsu S., Ohnishi T., Kawashima S.

Journal of Orthopaedic Surgery 28 ( 3 ) 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Background: A device that can measure posture alignment repeatedly is important for the prevention of hyperkyphosis. Objective: We devised a markerless measurement method for hyperkyphosis using digital photography and investigated the correlation with other noninvasive measurements and the validity and accuracy of this method. Methods: The study included 27 participants. The craniovertebral angle in supine (CVAS) and craniohorizontal angle in supine (CHAS) were calculated from digital photographs of the head and neck areas of the studied subjects with ImageJ. The correlations of CVAS and CHAS with the kyphosis index (KI) and block method (BM) were investigated. Intrarater correlation coefficient and Bland–Altman analyses were used to verify the reliability and accuracy of the measured results. Results: CHAS exhibited an excellent correlation with the KI and the BM. The intra- and interrater reliabilities of CHAS were almost perfect. Bland–Altman analysis revealed that CHAS was associated with minor addition errors. Conclusion: CHAS founded an excellent correlation and reliability with the conventional spinal postural alignment measurements. The addition error suggested that the manual was needed to confirm the landmark. The CHAS is a method used to measure the spinal postural alignment in a supine position without markers and without exposing the skin surface.

DOI： 10.1177/2309499020960834

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85096124620&origin=inward

Regression equation between required force and lumbar load of caregiver in supporting standing-up motion via computational musculoskeletal simulation 査読有り国際誌

Kitagawa K., Nishisako Y., Nagasaki T., Nakano S., Hida M., Okamatsu S., Wada C.

Pertanika Journal of Science and Technology 28 ( Special issue 2 ) 59 - 70 2020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）

Caregivers experience low back pain because of patient handling such as supporting standing-up. The lumbar load of a caregiver depends on the required force for patient handling motions. If the relationship between the required force and the lumbar load is quantitatively clarified, it may be useful for preventing low back pain in caregivers. In this study, we investigated the quantitative relationships between the required force and lumbar loads such as vertebral stress and muscle activity in supporting standing-up by computational musculoskeletal simulation. First, a musculoskeletal model of a caregiver was prepared, and then the model performed simulated supporting standing-up motions. The vertical load used as the required force was placed on the upper limb of the model. The compressive/shear stress of the vertebral (L4–L5) and muscle activities of spinae erector muscle group were recorded as the lumbar load. The results showed that there are highly significant correlations between the required force (r > 0.9, p < 0.01). In addition, regression equations for predicting each lumbar load by the required force with highly determination coefficients (R > 0.9) were obtained from these relationships. Furthermore, we found that when the required force was more than 120 N, the compression stresses of the vertebral exceeded injury threshold (3400 N) by the regression equation. These regression equations contribute to quantitatively consider lumbar loads of caregiver during patient handling based on injury thresholds and the required force. 2

DOI： 10.47836/pjst.28.S2.05

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85102634104&origin=inward

Linear regression technique for improvement of feet position estimation during standing balance using a cane with millimeter wave radar 査読有り国際誌

Fernandez I.G., Kitagawa K., Rahman K.A., Soh A.C., Gopalai A.A., Ahmad S.A., Wada C.

Pertanika Journal of Science and Technology 28 ( Special Issue 2 ) 71 - 81 2020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）

It is estimated that one in three seniors fall at least once a year. Falls are a global problem for the elderly that affects their quality of life and poses a great risk. In our research, we are trying to develop a system that could prevent falls by estimating the fall risk in real time. The system would measure the balance of the user by measuring the position of the Center of Gravity inside the Base of Support. In our previous research, we presented a system with a millimeter wave radar attached to a cane to measure the area of the Base of Support. However, the obtained results for the foot position estimation error were significantly worse than similar studies. One of the reasons was that the sensor was not really estimating the position of the feet but the position of the lower legs. Therefore, in this research we present a correction model to improve the feet position estimation. The proposed model was able to reduce the foot position estimation RMSE from 54 mm down to 34 mm, which is closer to the results of other similar studies measuring the position of the feet.

DOI： 10.47836/pjst.28.S2.06

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85102646844&origin=inward

地域在住高齢者における慢性痛の保有期間と心身機能の関係査読有り

肥田光正，今岡真和，中村美砂，中尾秀俊，田崎史江，生水智子，武田雅俊，山坂宏太，大西忠輔，和田親宗

慢性疼痛 38 ( 1 ) 229 - 233 2019年12月

立ち座り動作支援機器の開発と筋電位評価

三上隼人、土谷圭央、田中孝之、泉博之、和田親宗

第20回計測自動制御学会システムインテグレーション部門講演会 2B1-11 2019年12月

ホーム転落防止のためのホーム端検出に関する研究

徳田あかり，和田康宏，和田親宗

第45回感覚代行シンポジウム講演論文集 45 - 48 2019年12月

Effects of Counter-Movement Technique during Sport Climbing for Lower Limb Amputees through the Electromyogram Analysis 査読有り国際誌

Ryoya Nakamura, Gen Okuya, Yoshiki. Nishisako, Kisuke Iwasaki, Kodai Kitagawa, Naoki Chijiwa, Hisashi Arizono, Chikamune Wada

International symposium on ubiquitous healthcare 2019 (uHealthcare 2019) P-05 2019年12月

Prototype of measurement system for clothing pressures in spinal orthosis 査読有り国際誌

Koji Sakamoto, Kodai Kitagawa, Yuji Katae, Naoki Chijiwa, Aki Kuwazono, Hisashi Arizono, Chikamune Wada

The 17th International Conference on Biomedical Engineering (ICBME2019) No.1279 2019年12月

Estimation Method for Step Length of Caregiver by Machine Learning Technique Using Combination of Insole Pressure Sensor and Inertial Measurement Unit 査読有り国際誌

Kodai Kitagawa, Takayuki Nagasaki, Sota Nakano, Mitsumasa, Hida, Shogo Okamatsu, Chikamune Wada

The 17th International Conference on Biomedical Engineering (ICBME2019) No.1140 2019年12月

Comparison of Regression Algorithm for Vanishing Point Estimation based on Car Distribution 査読有り国際誌

Tangsuksant W., Noda M., Kitagawa K., Pintavirooj C., Wada C.

BMEiCON 2019 - 12th Biomedical Engineering International Conference 2019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）

© 2019 IEEE. In order to improve an application from the viewpoint of helping blind people waiting for the bus, classification of the vanishing view is required. The vanishing point from a perspective view is a feature that may improve the performance of viewpoint classification, especially in the case of congested traffic. The idea proposed by this study bases on the vanishing point estimation following car distribution on the road. In essence, the cars are detected using a You Only Look Once (YOLO) technique which extracts all the to the center point of a squared boundary. Normalization of the data points are then computed in percentages. Next is the calculation of the nineteen features of the data points of the car distribution. Finally, the vanishing point is estimated by supervised regression. This experiment compares the estimated results among five different regressions consisting of Linear, k-Nearest Neighbor, Decision Tree, Support Vector, and Multi-layer Per-ceptron regression. The obtain results show that the k-Nearest Neighbor regression computed the lowest distance error of 10.53, compared to the other regression algorithms.

DOI： 10.1109/BMEiCON47515.2019.8990326

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85080103444&origin=inward

体導音センサを用いたシャント血流音観察

城屋敷健志、谷口和久、安永親生、和田親宗、中野博

第52回九州人工透析研究会総会 76 2019年11月

在住高齢者の慢性疼痛の有無ならびに保有期間と心理機能との関係

肥田光正，中村美砂，今岡真和，中尾英俊，田崎史江，生水智子，和田親宗，大西忠輔，武田雅俊

第3回日本リハビリテーション医学会秋季学術集会 P2-2-2-2 2019年11月

デジタル画像計測による円背測定手法の開発

肥田光正，和田親宗，岡松将吾，北川広大，大西忠輔，多田康貴，湯川貴史，川島聡史，南征吾

第3回日本リハビリテーション医学会秋季学術集会 P3-1-2-4 2019年11月

Foot Position Estimation During Standing Balance Using a Cane with Millimeter Wave Radar 査読有り国際誌

Ibai Gorordo Fernandez, Chikamune Wada

7th International Symposium on Applied Engineering and Sciences (SAES2019) BM-15 2019年11月

Relationship Between the Required Force for Patient Handling and the Lumbar Load of Caregiver in Musculoskeletal Simulation 査読有り国際誌

Kodai Kitagawa, Yoshiki Nishisako, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

7th International Symposium on Applied Engineering and Sciences (SAES2019) BM-16 2019年11月

Daily Activity Recognition Method using Sensor-Installed Cane 査読有り国際誌

Chikamune Wada, Yunchu Huang, Yoshiki Nishisako1, Kodai Kitagawa, Naoya Kokusho, Takashi Fujimoto, Yoshio Tsuchiya, Hiroyuki Izumi, Takayuki Tanaka, Tatsuo Morifuji

7th International Symposium on Applied Engineering and Sciences (SAES2019) BM-08 2019年11月

Image-based Shoe Detection Method for Foot Clearance Measurement 査読有り国際誌

Nana Okadome, Ibai Gorordo Fernandez, Chikamune Wada

7th International Symposium on Applied Engineering and Sciences (SAES2019) BM-114 2019年11月

Activity Recognition using Instrumented Cane with Force Sensor and Inertial Measurement Unit for Elderly People 査読有り国際誌

Toshiyuki Terukina, Yoshiki Nishisako, Kodai Kitagawa, Tatsuo Morifuji, Naoya Kokusho, Takashi Fujimoto, Yoshio Tsuchiya, Hiroyuki Izumi, Takayuki Tanaka, Chikamune Wada

7th International Symposium on Applied Engineering and Sciences (SAES2019) BM-113 2019年11月

An influence of spinal orthosis on the movement of pelvic and spinal during Movements for Wiping the Anus 査読有り国際誌

Koji Sakamoto, Kodai Kitagawa, Yuji Katae, Naoki Chijiwa, Aki Kuwazono, Hisashi Arizono, Chikamune Wada

7th International Symposium on Applied Engineering and Sciences (SAES2019) BM-106 2019年11月

Clothing pressure measurement of a spinal orthosis during picking-up motion using pressure sensor system 査読有り国際誌

Koji Sakamoto, Kodai Kitagawa, Yuji Katae, Naoki Chijiwa, Aki Kuwazono, Hisashi Arizono, Chikamune Wada

13th International collaboration Symposium on Information, Production and Systems (ISIPS2019) P7-2 2019年11月

Decision tree-based model for feet distance estimation during assistive motion 査読有り国際誌

Kodai Kitagawa, Takayuki Nagasaki, Sota Nakano, Mitsumasa Hida, Shogo Okamatsu, Chikamune Wada

13th International collaboration Symposium on Information, Production and Systems (ISIPS 2019) P7-3 2019年11月

筋骨格シミュレータを用いた松葉杖歩行時の安定性における客観的な指標の検討　－松葉杖歩行時の重心加速度における特徴的な傾向の同定－

西迫善希，永﨑孝之，和田親宗

信学技報，WIT2019-21 29 - 32 2019年10月

Comparison of Regression Algorithms for Foot Placement Estimation Method using Foot Pressure Data during Supporting Standing-up Motion 査読有り国際誌

Kodai Kitagawa, Takayuki Nagasaki, Sota Nakano, Chikamune Wada

Proceedings of the SICE Annual Conference 2019 987 - 989 2019年09月

Evaluation of a Commercial Force Sensor for Real Time Applications 査読有り国際誌

Ahmed M. M. Almassri, Wan Zuha Wan Hasan, Chikamune Wada

14th International Conference on Innovative Computing, Information and Control ICICIC2019-082 2019年08月

Acceleration Response Characteristics of Body-conducted Sound Sensors; Comparison with Several Acceleration Sensors 査読有り国際誌

Takeshi Joyashiki, Chikamune Wada

5th World Congress on Electrical Engineering and Computer Systems and Sciences 2019年08月

ベッド上での体位変換介助における介助者の足部配置と腰部負荷の関係

松本光司，北川広大，和田親宗

第34回リハ工学カンファレンスinさっぽろ　講演論文集 162 - 163 2019年08月

S2E4-3　鏡映描写課題遂行時におけるフロー状態と生理反応の関係

倉岡宏幸, 金愛未, 高井瑠一朗, 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 ) 55 ( Supplement ) S2E4-3 - S2E4-3 2019年06月

Change of the Ground Reaction Force Obtained from Insole Pressure Sensors during Assistive Motion with Different Lumbar Loads 査読有り

Kodai Kitagawa, Tsuyoshi Uezono, Takayuki Nagasaki, Sota Nakano, Chikamune Wada

13th International Society of Physical and Rehabilitation Medicine World Congress (ISPRM2019) P3-1069 2019年06月

Influence of Floating Toe on Motor Function of Elderly People 査読有り

Shogo Okamatsu, Kazuaki Tsuji, Chikamune Wada

13th International Society of Physical and Rehabilitation Medicine World Congress (ISPRM2019) P3-481 2019年06月

鏡映描写課題遂行時におけるフロー状態と生理反応の関係

倉岡宏幸，金愛未，高井瑠一朗，和田親宗，三宅晋司

日本人間工学会第60回大会 S2E4-3 2019年06月

Grasping and attached mode in human-computer interaction in the study of mouse substitution 査読有り国際誌

Widodo R., Quita R., Amrizal S., Gunawan R., Wada C., Ardiansyah A., Sutrisno I., Rahmat M., Arfianto A., Handoko C., Santoso A., Santosa A., Ardhana V., Setiawan E.

Journal of Physics: Conference Series 1196 ( 1 ) 2019年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

© Published under licence by IOP Publishing Ltd. Some disabilities caused by sensory malfunction, accident, or congenital disorder could cause people difficulty in grasping the computer mouse. A well-known substitute uses an inertial sensor to monitor the body's orientation. This paper evaluates the efficiency and effectiveness of different methods of holding the sensor. There are two modes of holding the sensor, the grasping mode and the attached mode; we also evaluate a mouse as a baseline. The attached mode works by placing the sensor on the back of user's hand. The quantitative and qualitative evaluation procedure is based on ISO/TS 9241 part 411: Ergonomics of human-system interaction standard. The test consists of four levels of difficulty and indicates that the throughput and task completion times were not statistically different between grasping and attached mode. We also found that grasping mode and attached mode did not show significantly statistical differences in comfort and fatigue based on the questionnaires. The results also suggest that the orientation of the hand used in grasping and attached modes is suitable only for lower-impact computer use.

DOI： 10.1088/1742-6596/1196/1/012034

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85065715884&origin=inward

Obstacle Height Estimation Related to Suitable Viewpoint while Waiting for the Bus using Color Moment Technique 査読有り国際誌

Watcharin Tangsuksant,Chikamune Wada

8th International Conference on Software and Computing Technologies (ICSCT 2019) Paper ID: CT005 2019年04月

MUSCULOSKELETAL SIMULATION OF THE RELATIONSHIP BETWEEN FOOT POSITION AND STRESS OF THE L4-L5 JOINT IN SUPPORTING STANDING-UP MOTION TO PREVENT LOW BACK PAIN AMONG CAREGIVERS 査読有り国際誌

Kitagawa K., Nishisako Y., Nagasaki T., Nakano S., Wada C.

Journal of Mechanics in Medicine and Biology 19 ( 2 ) 2019年03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）

© 2019 World Scientific Publishing Company. Most caregivers have low back pain which results from frequent care activities such as assistance motion that supports transfer and standing-up. Various parameters are associated with the caregiver's lumbar load. In this study, we focus on the foot position of the caregiver as one of the subjective adjustable parameters. This study aimed to analyze the relationship between foot position and stresses of the L4-L5 joint as lumbar load during supporting standing-up via musculoskeletal simulation. The musculoskeletal model was tasked with simulating supported standing-up motions based on a specific pelvic position and angular variation of each joint. The anterior foot (left foot) was fixed, and the posterior foot (right foot) was moved to three backward positions and three rightward positions, thus obtaining nine posterior foot positions. Compressive, anteroposterior shear, and lateral shear stresses of the L4-L5 joint were compared for nine foot positions. The results showed that as the anteroposterior distance and lateral widths between both feet increased, the average value of compressive/shear stress of the L4-L5 joint during motions decreased. From our findings, we hypothesized that the foot position may reduce the lumbar load and prevent low back pain.

DOI： 10.1142/S0219519419400165

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85063738124&origin=inward

Cane with millimeter wave radar for base of support measurement 査読有り国際誌

Fernandez I.G., Wada C.

2019 IEEE 1st Global Conference on Life Sciences and Technologies, LifeTech 2019 133 - 136 2019年03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）

© 2019 IEEE. Base of Support (BoS) is a significant parameter for balance analysis. It is particularly important for people using assistive devices such as canes or walkers, because assistive devices improve the stability of the user by increasing the Base of Support. The objective of this research is to develop a wearable device that is able to analyze balance by measuring the position of the Center of Gravity (CoG) inside the Base of Support while using a cane. In this paper, we present our initial work to measure the Base of Support. We developed an instrumented cane with a millimeter wave radar in order to measure the Base of Support in real time. The point cloud data from the radar were grouped into clusters to identify the points belonging to each foot. A density-based spatial clustering of applications with noise (DBSCAN) algorithm was used for this purpose. Finally, the right and left foot were differentiated based on the position of the centroid of each cluster. Knowing the position of both feet with respect to the cane, we were able to measure the BoS with an error of 92.04 cm2(7.38 %).

DOI： 10.1109/LifeTech.2019.8884010

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85074890449&origin=inward

実装条件における体導音センサと空気伝導型マイクロホンの特性と比較

城屋敷健志,和田親宗

2019年日本生体医工学会九州支部学術講演会 1B5 2019年03月

杖型計測装置による日常動作の識別方法の提案

黄贇初,西迫善希,北川広大,森藤達雄,國生直也,藤本隆,土谷圭央,泉博之,田中孝之,和田親宗

2019年日本生体医工学会九州支部学術講演会 1A4 2019年03月

Neural Network Model for Electromagnetic Position Tracker Recalibration 査読有り国際誌

Ibai Gorordo Fernandez,Chikamune Wada

2019 IEEE 4th International Conference on Computer and Communication Systems (ICCCS 2019) CD-091 2019年02月

A study of hand-movement gestures to substitute for mouse-cursor placement using an inertial sensor 査読有り国際誌

Widodo R., Quita R., Setiawan R., Wada C.

Journal of Sensors and Sensor Systems 8 ( 1 ) 95 - 104 2019年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

© Author(s) 2019. This paper examines the new study of hand orientation as a substitute for computer-mouse movement and is evaluated based on ISO/TS 9241 part 411: Ergonomics of human-system interaction-evaluation methods for the design of physical input devices. Two pairs of hand-orientation candidates were evaluated, using, for example, pitch-roll and pitch-yaw to substitute for up-down and left-right mouse-cursor movements. The up-down cursor movement was generated from the pitch orientation, while the left-right cursor movement was generated from the roll or yaw orientation, depending on the evaluation of the proposed gesture. The research employed a standard computer mouse as a baseline comparison for the study. The empirical study was conducted to evaluate quantitative performance such as throughput and movement time. The best impression resulted when the throughput had the greatest value as well as the shortest movement time. The performance test was based on Fitts's law using a multi-directional tapping test as suggested by ISO/TS 9241-411. The test was divided into several levels of difficulty, including high, medium, low, and very low. The other assessment is qualitative and was performed using the comfort-rating scale questionnaire and rating of perceived exertion of comfortability and fatigue. The quantitative results show that pitch-yaw throughput is slightly higher than for the pitch-roll gesture, and that the movement time in pitch-yaw is slightly less than in pitch-roll, although there is no statistically significant difference between the two. We also found that pitch-yaw movements have a higher level of comfort based on the comfort-rating scale test. Since the test was divided into levels of difficulty, we identified those gestures suitable for the task with a low and very low level of difficulty based on throughput, movement time, and error-rate results. Finally, this study suggests that pitch-roll and pitch-yaw movements of the hand can be used as substitutes for the mouse, and that pitch-yaw movements are superior in regard to causing less fatigue than pitch-roll movements. Furthermore, this study provides a new suggestion for a suitable level of difficulty when using an inertial sensor as an emulator for the movement of a mouse cursor in the field of human-computer interaction.

DOI： 10.5194/jsss-8-95-2019

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85061906655&origin=inward

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

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

International Journal of New Technology and Research 5 ( 1 ) 33 - 39 2019年02月

Static Obstacle Detection along the Road with a Combined Method 査読有り国際誌

Tangsuksant W., Wada C.

BMEiCON 2018 - 11th Biomedical Engineering International Conference 2019年01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）

© 2018 IEEE. A smart phone application capable of recognizing numbers of oncoming buses would be of great assistance to blind individuals. To facilitate bus route number reading, obstacles along the road should first be identified. This paper is concerned with identification of static obstacles comprising two processes: the first process involves road area detection and is addressed by applying a rotational invariant of the uniform local binary pattern via k-means clustering. Furthermore, an artificial neural network is employed to select a group of k-means that contains the road area. Next, the straight lines on the road are detected via Hough line transformation. Finally, the line selection step is used to define the road area boundary. The second process involves static obstacle detection and is addressed through segmentation, vertical projection of the road area boundary, and consideration of the vertically projected signal. The experimental results demonstrate a high performance of the proposed method with an F-measure of 0.912.

DOI： 10.1109/BMEiCON.2018.8609985

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85062055998&origin=inward

Effect of age on heart rate responses and subjective mental workload during mental tasks 査読有り国際誌

Kuraoka H., Kurosaka C., Wada C., Miyake S.

Advances in Intelligent Systems and Computing 827 316 - 321 2019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（国際会議プロシーディングス）

© Springer Nature Switzerland AG 2019. We investigated the effect of age on heart rate (HR) responses and subjective mental workload during mental tasks. In this study, 55 male participants performed a mental arithmetic (MA) task and a mirror tracing (MT) task for 5 min each. Electrocardiogram (ECG) was recorded during these mental tasks and resting periods. Low frequency component (LF), high frequency component (HF), and LF/HF ratio of heart rate variability (HRV) were derived from ECG signals. NASA Task Load Index (NASA-TLX) was used to evaluate the subjective mental workload during each task. In the results, HR was significantly larger in the MA task than the resting period. LF was significantly smaller in the MA than the resting period before the task. On the other hand, no HR changes from the baseline in the MT task were found, suggesting that Pattern 2 response might appear. In the results of HRV indices, decrease in LF suggests the inhibition of the parasympathetic nervous system activity by the task. These results are consistent with those of our previous studies. No significant main interaction with age and blocks (MA, MT and resting periods) were found in physiological responses except for LF/HF and subjective mental workload score. Therefore, the physiological responses induced by mental tasks might be more susceptible to task characteristic than to aging. This study partly supported the previous study.

DOI： 10.1007/978-3-319-96059-3_34

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85051780442&origin=inward

Viewpoint classification for the bus-waiting blinds in congested traffic environment 査読有り国際誌

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

International Journal of Fuzzy Logic and Intelligent Systems 19 ( 1 ) 48 - 58 2019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）

© The Korean Institute of Intelligent Systems. To provide an effective notification service for the blinds awaiting the bus, it is crucial to have a viewpoint classification technique in which a viewpoint is defined with tilt and panning of camera. This paper proposes a viewpoint classification method using the car distribution information in the congested traffic environment. The proposed method takes four steps for classification. First, the YOLO algorithm is used to detect the car positions in the images. Second, the car positions are normalized for feature computation. Third, nineteen simple features are extracted and finally, the viewpoint classification is conducted. The proposed method uses the information gain measure to select relevant ones from the extracted features, and uses the Random Forest algorithm as a classifier. In the experiments, the proposed method has been tested for various roadside scenarios of congested traffic in day and night. The accuracies for car detection and viewpoint classification were 79:90% and 86:00%, respectively, which are improved compared to the prior work.

DOI： 10.5391/IJFIS.2019.19.1.48

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85065102452&origin=inward

松葉杖の脇当て保持に関わる筋活動の解析査読有り

西迫善希,永﨑孝之,和田親宗

理学療法科学 ( 理学療法科学学会 ) 34 ( 2 ) 199 - 204 2019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）

© 2019, Society of Physical Therapy Science (Rigaku Ryoho Kagakugakkai). All rights reserved. [Purpose] To clarify the reason why the axillary pad often deviates from the axilla during double-crutch walking using a musculoskeletal simulator. [Participants and Methods] The subjects were five healthy young males without orthopedic disease. Movement during crutch walking was measured using a 3D motion analysis system. Based on the obtained data, muscle activity related to the shoulder joint during double-crutch walking was modeled using a musculoskeletal simulation. [Results] The shoulder joint was abducted in the crutch stance phase of all subjects. [Conclusion] The results suggest that crutch walking with the shoulder blades rotated downward may suppress the activity of the abductor muscle of the shoulder joint and the activity of the shoulder joint adductor muscle.

DOI： 10.1589/rika.34.199

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85065927350&origin=inward

Usefulness of simulation method to improve efficiency of chair-to-wheelchair transfer of patients performed by caregivers 査読有り

Nakano Sota, Okada Hirotaka, Higo Shigeyoshi, Nakamura Kouichi, Kitagawa Kodai, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 31 ( 10 ) 802 - 806 2019年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

[Purpose] We aimed to clarify whether demonstration and simulated experience help the ability of care-receivers to get transferred, such as from the bed to the commode. [Participants and Methods] Participants included 28 nurses and 17 caregivers (34 females and 11 males). We developed a total floor reaction force measurement device to quantify the total loading level of care-receivers and caregivers and force shoes to quantify the loading level of the caregivers. Using these instruments, we constructed a system to measure the load on the lower limbs of the care-receivers during partial assistance. We divided the participants into the control, demonstration, and simulated experience method groups. We examined the differences in the load on the lower limbs before and after the intervention. [Results] The loads on the lower limbs of care-receivers when their buttocks were lifted from the chair were 11.7 ± 69.6, 61.8 ± 79.4, and 101.0 ± 104.0 N in the control, demonstration, and simulated experience groups. [Conclusion] These data suggest that the simulated experience method could help make use of the ability of the care-receiver to get transferred. Even care workers for the sanatorium-type sickbeds could learn to utilize the physical ability of the care-receivers using simulated experience.

DOI： 10.1589/jpts.31.802

その他リンク： https://ci.nii.ac.jp/naid/130007731293

Relationship between surface electromyography of the spinae erector muscles and subjectively adjusted step length in the supporting standing-up motion 査読有り

Kitagawa Kodai, Uezono Tsuyoshi, Nagasaki Takayuki, Nakano Sota, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 31 ( 11 ) 869 - 872 2019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] Caregivers experience low back pain owing to frequent patient handling motions such as supporting the body while standing up. To prevent low back pain in caregivers, low load posture while engaging in patient handling motions is required. We determined the relationship between surface electromyography of the erector spinae muscles and subjective step length as "long" and "short" during the supporting standing-up motions of caregivers. [Participants and Methods] Ten young male participants were asked to perform supporting standing-up motion 10 times using two-step lengths comprised of subjective long and short steps. During supporting standing-up motion, we measured surface electromyograms of the erector spinae muscles and calculated the integral electromyographic values. [Results] The subjective long/short-step length normalized by body height did not differ across the participants. In addition, the subjective long-step length was longer than the subjective short-step length in all the participants. Integral electromyographic values for both the left and right erector spinae muscles in the short-step length were significantly lower than those in the long-step length when the data obtained from all the participants were used. [Conclusion] We considered that the load of the erector spinae muscle will be reduced if the short-step instead of the long-step instruction is given. In the future, instructions based on the subjective step-length variation in caregivers must be considered.

DOI： 10.1589/jpts.31.869

その他リンク： https://ci.nii.ac.jp/naid/130007751390

Development of real-time electromyography controlled 3D printed robot hand prototype 査読有り

Wahit M.A.A., Romzi F.Z., Ahmad S.A., Marhaban M.H., Chikamune W.

International Journal of Electrical and Computer Engineering Systems 10 ( 1 ) 35 - 44 2019年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Developing an anthropomorphic robotic hand (ARH) has become a relevant research field due to the need to help the amputees live their life as normal people. However, the current state of research is unsatisfactory, especially in terms of structural design and the robot control method. This paper, which proposes a 3D printed ARH structure that follows the average size of an adult human hand, consists of five fingers with a tendon-driven actuator mechanism embedded in each finger structure. Besides that, the movement capability of the developed 3D printed robot hand validated by using motion capture analysis to ensure the similarity to the expected motion range in structural design is achieved. Its system functionality test was conducted in three stages: (1) muscular activity detection, (2) object detection for individualfinger movement control, and (3)integration ofbothstages in one algorithm. Finally, an ARHwas developed, whichresembles human hand features, as well as a reliable system that can perform opened hand palm and some grasping postures for daily use.

DOI： 10.32985/ijeces.10.1.5

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85080057645&origin=inward

Prototype of Musculoskeletal Model for Assistance Motion of Standing-up 査読有り

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

The 6th Symposium on Applied Engineering and Sciences 2018 259 - 260 2018年12月

Simulation of ultrasonic sensor placement for foot angle estimation 査読有り国際誌

Yejong Lee, Ibai Gorordo Femandez, Kodai Kitagawa, Chikamune Wada

International Symposium on Ubiquitous Healthcare 2018 23 2018年12月

Performance Evaluation of a Commercial Electromagnetic Tracking Controller for Motion Capture 査読有り

Ibai Gorordo Fernandez, Chikamune Wada

The 6th Symposium on Applied Engineering and Sciences 2018 124 - 125 2018年12月

Comparison of HSV and RGB ColorModels using Color Moment for Obstacles Matching along the Road 査読有り

Watcharin Tangsuksant, Chikamune Wada

The 6th Symposium on Applied Engineering and Sciences 2018 126 - 127 2018年12月

Comparison of Body-conducted sound sensor and Air-conducted sound Sensor via a lung sound simulator 査読有り

Takeshi Jouyashiki, Chikamune Wada

The 6th Symposium on Applied Engineering and Sciences 2018 128 - 129 2018年12月

Development of Real-time Secured Grasping System for Wearable Robotic Hand Glove 査読有り

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

The 6th Symposium on Applied Engineering and Sciences 2018 162 - 163 2018年12月

ストレス軽減のためのガム咀嚼のタイミングがRR間隔に及ぼす影響

福本舜介,和田親宗

第51回日本人間工学会中国四国支部大会講演番号307 2018年12月

鏡映描写課題遂行時におけるフロー状態に関する研究

倉岡宏幸，金愛未，高井瑠一朗，和田親宗，三宅晋司

日本人間工学会九州・沖縄支部第39回大会 2-1 2018年12月

Relationship between body acceleration and muscle load of upper limbs in lower-limb amputees during ladder climbing 査読有り

Iwasaki K., Okuya G., Chijiwa N., Arizono H., 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 recent years, the popularity of sports climbing competitions has increased. Currently, not only able-bodied people but also people with disabilities may be interested in sports climbing. However, evaluation and guidance in climbing competitions are subjective, and those who attempt sports climbing for the first time may find it difficult to compete. Additionally, the current training methods have been developed for able-bodied people, and it is not known whether they are suitable for people with disabilities. If an objective evaluation method is established, it will be possible to propose a rational and effective teaching method for sports climbing participants. Therefore, the ultimate goal of this study is to develop an objective training method for climbing for lower-leg amputees. We studied subjects climbing a ladder that imitated the wall-climbing process and analyzed the relationship between EMG of the upper limbs and body center acceleration during climbing, which revealed a close relationship.

DOI： 10.1109/ICT-ROBOT.2018.8549885

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85060011674&origin=inward

Classification Method of Assistance Motions for Standing-up with Different Foot Anteroposterior Positions using Wearable Sensors 査読有り

Kitagawa K., Uezono T., Nagasaki T., Nakano S., 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 this paper, we propose an educational system of assistance motions using wearable sensors. In addition, we will briefly introduce our proposed system and evaluate the classification method of assistance motion with different foot positions using wearable sensors as a first step toward developing an educational system. Our proposed system comprises shoe-type pressure sensors and a single inertial measurement unit attached to the trunk. The proposed method classifies assistance motion by machine learning technique using feature quantities obtained from wearable sensors. Herein we evaluated whether the proposed method could classify assistance motions for supporting standing-up with different foot positions. Participants were five young men and were asked to perform two motions with different two feet anteroposterior positions positions ("short step length" and "long step length"). The results showed that the proposed method was able to classify the two motions with 90% or higher accuracy for all participants. Therefore, we considered that the method could be used in the educational system.

DOI： 10.1109/ICT-ROBOT.2018.8549912

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85060048140&origin=inward

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

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85060057337&origin=inward

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

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85051380465&origin=inward

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

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85049561354&origin=inward

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

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85067125589&origin=inward

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

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85048464581&origin=inward

New Combination Method for Road Features Extraction 査読有り

Watcharin Tangsuksant, Chikamune Wada

International Conference on ICT Robotics 2017 Paper ID:104A4 2017年11月

An estimation method of knee and ankle joint angles during standing up motion using an inertial sensor 査読有り国際誌

Chikamune Wada, Fang Jin, Takayuki Nagasaki

Fifth International Symposium on Applied Engineering and Sciences 2017年11月

Development of Axillary Pressure Feedback System for Crutch Walking 査読有り国際誌

Chikamune Wada, Takayuki Nagasaki

39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society Paper FrBT16.2 2017年07月

Auto-grasping algorithm of robot gripper based on pressure sensor measurement 査読有り国際誌

Almassri A., Wada C., Wan Hasan W., Ahmad S.

Pertanika Journal of Science and Technology 25 ( S ) 113 - 122 2017年02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）

© 2017 Universiti Putra Malaysia Press. This paper presents an auto grasping algorithm of a proposed robotic gripper. The purpose is to enhance the grasping mechanism of the gripper. Earlier studies have introduced various methods to enhance the grasping mechanism, but most of the works have not looked at the weight measurement method. Thus, with this algorithm, the weight of the object is calculated based on modified Wheatstone Bridge Circuit (WBC) which is controlled by programmable interface controller (PIC) method. Having this approach introduces and improves the grasping mechanism through an auto grasping algorithm. Experimental results show that an auto grasping algorithm based on pressure sensor measurements leads to a more precise grasping measurement and consequently enhance the sensitivity measurement as well as accurate movement calibration. Furthermore, several different grasping objects based on the proposed method are examined to demonstrate the performance and robustness of our approach.

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85029637639&origin=inward

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

Romy Budhi Widodo, Chikamune Wada

Journal of Advanced Computational Intelligence and Intelligent Informatics 21 ( 2 ) 321 - 329 2017年02月

Study of the Relationship Between Sit-to-Stand Activity and Seat Orientation 査読有り

Chikamune Wada, Shuichi Ino

Journal of Advanced Computational Intelligence and Intelligent Informatics 21 ( 2 ) 337 - 341 2017年02月

Real-time human motion analysis and grasping force using the OptiTrack system and flexi-force sensor 査読有り国際誌

Saidon N., Wada C., Ahmad S., Rahman R., Eguchi K., Tomiyama Y., Rahman F.

Pertanika Journal of Science and Technology 25 ( S ) 69 - 76 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Universiti Putra Malaysia Press. Biologically inspired robotic hands have important applications in industry and biomedical robotics. The grasping capacity of robotic hands is crucial for a robotic system. This paper presents an experimental study on the finger force and movements of a human hand during the grasping operation in real-time. It focuses on two topics; measuring grasping force using Flexi-force sensors and analysing human hand action during grasping operation. The findings show that lifting required higher forces compared with grasp force in the static phase.

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85029619291&origin=inward

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

Jin F., Nagasaki T., Wada C.

Journal of Physical Therapy Science ( 理学療法科学学会 ) 29 ( 7 ) 1171 - 1175 2017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）

© 2017 The Society of Physical Therapy Science. Published by IPEC Inc. [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

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85024372785&origin=inward

Attitude Estimation using Kalman Filtering: External Acceleration Compensation Considerations 査読有り国際誌

Romy B. Widodo, C. Wada

Journal of Sensors 2016 Article ID 6943040 2016年12月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Attitude estimation is often inaccurate during highly dynamic motion due to the external acceleration. This paper proposes extended Kalman filter-based attitude estimation using a new algorithm to overcome the external acceleration. This algorithm is based on an external acceleration compensation model to be used as a modifying parameter in adjusting the measurement noise covariance matrix of the extended Kalman filter. The experiment was conducted to verify the estimation accuracy, that is, one-axis and multiple axes sensor movement. Five approaches were used to test the estimation of the attitude: (1) the KF-based model without compensating for external acceleration, (2) the proposed KF-based model which employs the external acceleration compensation model, (3) the two-step KF using weighted-based switching approach, (4) the KF-based model which uses the threshold-based approach, and (5) the KF-based model which uses the threshold-based approach combined with a softened part approach. The proposed algorithm showed high effectiveness during the one-axis test. When the testing conditions employed multiple axes, the estimation accuracy increased using the proposed approach and exhibited external acceleration rejection at the right timing. The proposed algorithm has fewer parameters that need to be set at the expense of the sharpness of signal edge transition.

DOI： 10.1155/2016/6943040

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84983795667&origin=inward

Wearable Robotic Hand Glove System Based on Multi Force Sensors for Rehabilitation Application 査読有り

Ahmed M. Almassri, W. Z. Wan Hasan, Chikamune Wada

Fourth International Symposium on Applied Engineering and Sciences (SAES2016) 87 2016年12月

Analysis of Foot Plantar Pressure using Platform System for Foot Health Screening 査読有り

A.M.M. Ghazali, W.Z.W. Hasan, M.N. Hamidun, S.A. Ahmed and C. Wada

Fourth International Symposium on Applied Engineering and Sciences (SAES2016) 89 2016年12月

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

Fang Jin, Chikamune Wada

Fourth International Symposium on Applied Engineering and Sciences (SAES2016) 91 2016年12月

Improvement Study on a Shoe-type Measurement Device 査読有り

Romy Budhi Widodo, Chikamune Wada

Fourth International Symposium on Applied Engineering and Sciences (SAES2016) 92 2016年12月

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

T. Nagasaki, H. Kato, H. Arizono, T. Onda, T. Oda, C. Wada

Fourth International Symposium on Applied Engineering and Sciences (SAES2016) 93 2016年12月

Trial Manufacture of Grasping Force Feedback System Using Pressure Stimulus for Prosthesis Limb 査読有り

Junya Hirakawa, Chikamune Wada

Fourth International Symposium on Applied Engineering and Sciences (SAES2016) 177 2016年12月

Physical Measurement for Human Assistive Technology 招待有り査読有り国際誌

Chikamune Wada

International Conference on Communication and Computing Systems2016 2016年09月

Estimating the Initial Trunk Angle for a Standing-Up Motion Guidance System Using an Inertial Sensor 査読有り

Chikamune Wada

International Workshop on Smart Info-Media Systems in Asia 2016 Paper ID: SS6-1 2016年09月

Development of Devices to Measure Loads on Care-Receivers’ Lower Limbs on Assisted Transfer 査読有り

Sota Nakano, Chikamune Wada

SICE Annual Conference 2016 Paper ID: Th2aPo4.8 2016年09月

Simulation of Ultrasonic Sensors in a Shoe-Type Measurement Device 査読有り

Romy Budhi Widodo, Chikamune Wada

SICE Annual Conference 2016 Paper ID: Fr2E.1 2016年09月

Real-time human motion analysis and grasping force using the OptiTrack system and Flexi-force sensor 査読有り国際誌

N. F. Elya Saidon, Chikamune Wada, Siti A. Ahmad, Ribhan Zafir Abdul Rahman, Kiyotaka Eguchi, Yoshiyuki Tomiyama, Farida Izni Abd Rahman

International Conference on Electrical & Electronic Technology 2016 Paper ID:1021 2016年08月

Auto-grasping Algorithm of Robot Gripper Based on Pressure Sensor Measurement 査読有り国際誌

Ahmed M. M. Almassri, W. Z. Wan Hasan, S.A. Ahmad, S. Shafie, M.N. Hamidun, Chikamune Wada

International Conference on Electrical & Electronic Technology 2016 Paper ID:1055 2016年08月

Influence of electrical stimulation on hip joint adductor muscle activity during maximum effort 査読有り

Sota Nakano, Chikamune Wada

Journal of Physical Therapy Science 28 ( 5 ) 1633 - 1635 2016年05月

Analysis of Crutch Position in the Horizontal Plane to confirm the stability of the axillary pad for safe double-crutch walking 査読有り

Takayuki Nagasaki, Hiroshi Katoh, Hisashi Arizono, Hikaru Chijimatsu, Naoki Chijiwa, Chikamune Wada

Journal of Physical Therapy Science 28 ( 5 ) 1438 - 1442 2016年05月

医療・福祉と工学招待有り

和田親宗

臨床歩行分析研究会誌 ( 臨床歩行分析研究会 ) 3 ( 1 ) 1 - 3 2016年03月

The influence of antagonist muscle electrical stimulation on maximal hip adduction force 査読有り

Sota Nakano, Chikamune Wada

Journal of Physical Therapy Science 28 ( 1 ) 124 - 127 2016年01月

2D1-3　同一精神課題に対する教示内容の違いによる生体反応の差異

倉岡宏幸, 和田親宗, 鶴原一樹, 三宅晋司

人間工学 ( 一般社団法人日本人間工学会 ) 52 ( Supplement ) S324 - S325 2016年01月

1F3-3　模擬作業を用いた装着型アシストツールのアシスト効果の評価

泉博之, 和田親宗, 岸本あらき, 田中孝之

人間工学 ( 一般社団法人日本人間工学会 ) 52 ( Supplement ) S232 - S233 2016年01月

An accurate wireless data transmission and low power consumption of foot plantar pressure measurements 査読有り国際誌

Aina Mardhiyah M.Ghazali, W.Z.Hasan, M.N.Hamidun, Ahmed H.Sabry, S.A.Ahmed, C.Wada

2015 IEEE international symposium on robotics and intelligent sensors(IRIS2015) 302 - 307A 2015年12月

Optimisation of grasping object based on pressure sensor measurement for robotics hand gripper 査読有り国際誌

Ahmed Almassri, W Z Wanhasan, Siti Ahmad, Asnor Juraiza Ishak, Chikamune Wada

Ninth International Conference on Sensing Technology (ICST 2015) 2016-March 795 - 798 2015年12月

担当区分：最終著者,　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）

This paper presents an optimization of grasping object based on pressure sensor measurement. In this work, a commercial flexi force pressure sensors are assembled on the robotic hand gripper model with introducing new arrangement of pressure distributions. For optimization purpose, the authors introduced Wheatstone Bridge Circuit (WBC) methods whereby the pressure distributions were applied. Therefore, with the new arrangement of pressure sensor distribution it has promised higher sensitivity as well as stability for the developed robotic hand gripper system. This framework is considered as one of the techniques that can be applied for robotic hand applications based on pressure sensor especially for high-risk tasks such as military and dangerous environment. In other word, it can save people's life.

DOI： 10.1109/ICSensT.2015.7438505

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84964830236&origin=inward

Improvement of a standing-up motion guidance system using an inertial sensor 査読有り

C.Wada, K.Eguchi, F.Jin

Eighth Asian-Pacific Conference on Biomechanics 84 2015年09月

Development of new tele-rehabilitaion system using virtual reality technology for the elderly and the disabled person 査読有り

Y.Nakajima, C.Wada, A.Kudo, S.Sugihara, T.Izumi, T.Miyasaka, K.Kuwano, D.Maeda, T.Tanaka

Eightth Asian-Pacific Conference on Biomechanics 82 2015年09月

A study of the relationship between sit-to-stand activity and seat orientation 査読有り国際誌

C.Wada, T.Oda, Y.Tomiyama, S.Ino

IEA2015 paper ID: 828 2015年08月

Effects of a sensory intake task on heart rate and heart rate variability 査読有り国際誌

Hiroyuki Kuraoka, Shinji Miyake, Chikamune Wada

IEA2015 2015年08月

Analysis of crutch position in the horizontal plane for confirming the stability of the axillary pad during double-crutch walking 査読有り国際誌

Takayuki Nagasaki, Hiroshi Katoh, Hisashi Arizono, Hikaru Chijimatsu, Naoki Chijiwa, Chikamune Wada

IEA2015 paper ID: 1006 2015年08月

Novel method for evaluation of subtalar joint alignment under weight-bearing conditions using laser beam 査読有り国際誌

T.Onishi, M.Hida, Y.Nakamura, E.Ozawa, T.Wada, T.Honda, C.Wada

WCPT2015 2015年05月

介助者の足部位置が要移乗介助者の立ち上がる力に及ぼす影響査読有り

中野聡太,和田親宗,加藤浩

理学療法科学 30 ( 5 ) 725 - 728 2015年05月

A new device for foot sensory examination employing auto-presentation of shear force stimuli against the skin 査読有り

M.Sato, N.Takahashi, S.Yoshimura, K.Yamashita,C.Wada, S.Ino, A.Higuchi, T.Fukui, T.Hirano

Journal of Biomechanical Science and Engineering 10 ( 2 ) 1 - 11 Paper No.14-00487 2015年05月

呼吸音計測用体導音センサの感度評価:-電気理論計算シミュレーションと有限要素法による設計支援の検討-

城屋敷健志, 和田親宗

バイオメディカル・ファジィ・システム学会大会講演論文集 ( バイオメディカル・ファジィ・システム学会 ) 28 ( 0 ) 239 - 240 2015年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（研究会，シンポジウム資料等）

Breathing sound reflects the respiratory status, such as a state of airway, effort of respiration, alteration of sound induced by disease, and so on. We have been developing a breath sound sensor with improved acoustic impedance matching. In this paper, we compared two simulation methods based on the frequency characteristics of sensor. First of all, we executed numerical analysis of breath sound sensor, based on the electrical equivalent circuit model. Next, we used the FEM to simulate compared with the numerical simulation in electrical equivalent circuit model. The reason why to use FEM was that FEM could simulate the various conditions of sensor parameter. From the results, we concluded FEM simulation was more useful.

DOI： 10.24466/pacbfsa.28.0_239

その他リンク： https://ci.nii.ac.jp/naid/130007998636

便座からの起立・着座動作時の頭部運動に着目した身体的負担に関する考察

近井学, 小澤恵美, 土井幸輝, 島田茂伸, 和田親宗, 井野秀一

電子情報通信学会技術研究報告（福祉情報工学） 115 53 - 57 2015年01月

OS3-3 DEVELOPMENT OF NEW TELE-REHABILITATION SYSTEM USING VIRTUAL REALITY TECHNOLOGY FOR THE ELDERLY AND THE DISABLED PERSON(OS3: Rehabilitation Devices I) 査読有り国際誌

Nakajima Yasuhiro, Wada Chikamune, Kudo Akira, Sugihara Shunichi, Izumi Takashi, Miyasaka Tomoya, Kuwano Kohki, Maeda Daisuke, Tanaka Toshiaki

Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics ( 一般社団法人日本機械学会 ) 2015.8 ( 0 ) 82 2015年01月

2D46 股関節過剰収縮における温熱療法と寒冷療法の影響(OS12-4:傷害とその予防・軽減のバイオメカニクス(4))

池田航, 和田親宗, 中野聡太

バイオエンジニアリング講演会講演論文集 ( 一般社団法人日本機械学会 ) 2015.27 ( 0 ) 473 - 474 2015年01月

OS3-6 Improvement of a Standing-up Motion Guidance System using an Inertial Sensor(OS3: Rehabilitation Devices II) 査読有り国際誌

Wada Chikamune, Eguchi Kiyotaka, Jin Fang

Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics ( 一般社団法人日本機械学会 ) 2015.8 ( 0 ) 84 2015年01月

Complementary Filter for Orientation Estimation: Adaptive gain based on dynamic acceleration and its change 査読有り

Romy Widodo, Hiraku Edayoshi, Chikamune Wada

Joint 7th International Conference on Soft Computing and Intelligent Systems and 15th International Symposium on Advanced Intelligent Systems 906 - 909 2014年12月

Can electrical stimulation of the tensor fascia lata muscle decrease the maximum adduction force of the hip joint? 査読有り

Sota Nakano, Wataru Ikeda, Chikamune Wada

Joint 7th International Conference on Soft Computing and Intelligent Systems and 15th International Symposium on Advanced Intelligent Systems 1627 - 1628 2014年12月

Estimation and Improvement of Foot Pressure Measurement System for Standing-Up Motion in Elderly 査読有り

Fang Jin, Tadahiro Arima, Chikamune Wada

Joint 7th International Conference on Soft Computing and Intelligent Systems and 15th International Symposium on Advanced Intelligent Systems 1064 - 1067 2014年12月

Pressure Sensor: State of the Art, Design, and Application for Robotic Hand 査読有り国際誌

Ahmed M. Almassri, W. Z. Wan Hasan, S. A. Ahmad, A. J. Ishak, A. M. Ghazali, D. N. Talib, Chikamune Wada

Journal of Sensors Article ID 846487 2014年12月

Development of a sensory-enhancing robot-aided rehabilitation system with tendon vibration 査読有り国際誌

F.Wada, T.Matsuzawa, C.Wada

2nd meeting of the International Society for Restorative Neurology 39 2014年10月

The use of combined warm and cold stimulation for palm apparent motion 査読有り国際誌

Chikamune Wada

the 9th Asian-Pacific Conference on Medical and Biological Engineering PF05 2014年10月

Effects of differences in task characteristics on autonomic nervous system responses 査読有り国際誌

Hiroyuki Kuraoka, Shinji Miyake, Chikamune Wada

International Journal of Psychophysiology 94 133 2014年09月

Trial Study to measure foot position for a walking rehabilitation support system using a shoe-type measurement device 査読有り国際誌

Chikamune Wada, Futoshi Wada, Takafumi Ienaga

SICE Annual Conference 2014 2534 - 2537 2014年09月

起立動作誘導システム招待有り

和田親宗

化学工業 ( 化学工業社 ) 65 ( 8 ) 29 - 33 2014年08月

Analysis of pressures exerted on the shoulder piece (Axillary pad) while using a crutch 査読有り国際誌

T. Nagasaki, H. Katoh, H. Arizono, N. Chijiwa, C. Wada

The 4th Health care System Ergonomics and Patient Safety Paper ID 108 2014年06月

松葉杖歩行における手掌部疼痛に関する基礎研究査読有り

永崎孝之,加藤浩,岡田裕隆,有薗央,千々末光,千々和直樹,和田親宗

リハビリテーション・エンジニアリング 29 ( 2 ) 100 - 106 2014年05月

Analysis of Crutch Position in the Horizontal Plane to Estimate the Stability of the Axillary Pad in the Axilla during Single-crutch Walking 査読有り

Nagasaki Takayuki, Katoh Hiroshi, Arizono Hisashi, Chijimatsu Hikaru, Chijiwa Naoki, Wada Chikamune

Journal of Physical Therapy Science 26 ( 11 ) 1753 - 1756 2014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] The aim of this study was to estimate the stability of the axillary pad in the axilla during single-crutch walking through kinematic analysis of the crutch position in the horizontal plane. [Subjects] The subjects were 19 healthy young males. [Methods] The subjects were instructed to walk 5 m in a straight line while using a single crutch. This was repeated 10 times. Repeated-measures analysis of variance and Tukey's honest significance test were used to compare crutch angles across three time points during crutch stance (crutch contact, mid stance and crutch off) for each subject. [Results] A statistically significant effect of time was found in 17 of the 19 subjects. Sixteen of these 17 subjects rotated the crutch externally from crutch contact to crutch off. [Conclusion] External rotation of the crutch throughout the stance phase is important to enable the axillary pad to be held tightly against the chest wall. These results may lead to alterations of the instructions for crutch use and the prevention of falls.

DOI： 10.1589/jpts.26.1753

その他リンク： https://ci.nii.ac.jp/naid/130004704088

Development of a Standing-up Motion Guidance System using an Inertial Sensor 査読有り国際誌

Chikamune. Wada,Yijiang Tang,Tadahiro Arima,

The 14th International Symposium on Advanced Intelligent Systems Fa5-3 2013年11月

上腕への振動刺激による運動錯覚現象の創出に関する試み

松澤卓実,和田太,蜂須賀研二,和田親宗

第55回北九州医工学術者会議 2013年10月

A Method for the Estimation of Continuous Blood Pressure Measurement 査読有り国際誌

Hiroyuki Kuraoka,Shinji Miyake,Chikamune Wada

International Symposiumu on Applied Engineering and Sciences Paper ID 019 2013年09月

A Standing -Up Motion Guidance System by Estimating COG Movement 査読有り国際誌

Chikamune. Wada,Yijiang Tang,Tadahiro Arima,

International Symposiumu on Applied Engineering and Sciences Paper ID 024 2013年09月

Study on Excessive Shrinkage Control that Prevents the Passive Exercise to the Hip Abduction Direction 査読有り国際誌

Wataru Ikeda,Sota Nakano,Chikamune Wada

International Symposiumu on Applied Engineering and Sciences Paper ID 015 2013年09月

Characteristics of Breathing Sound Sensor with improved Acoustic Impedance Matching 査読有り国際誌

Takeshi Jouyashiki,Chikamune Wada

International Symposiumu on Applied Engineering and Sciences Paper ID 016 2013年09月

Improvement Research of Shoe-Type Measurement Device for a Walking Rehabilitation Support System 査読有り国際誌

Chikamune Wada,Daisuke Takigawa,Futoshi Wada,Kenji Hachisuka,Takafumi Ienaga,Yoshihiko Kimuro

The 15th International Conference on Human-Computer Interaction 157 - 164 2013年07月

Designing a Metal Hydride Actuator with Human-Compatible Softness and High Power-to-Weight Ratio for Future Quality-of-Life Technologies 査読有り国際誌

Shuichi Ino,Mitsuru Sato,Minako Hosono,Chikamune Wada,Shinichi Yoshimura,Kazuhiko Yamashita,Takashi Izumi

The 15th International Conference on Human-Computer Interaction 111 - 120 2013年07月

Development of a Chest X-ray Examination Support System for Foreigners Using a Personal Digital Assistant 査読有り国際誌

Mitsuru Miyata,Chikamune Wada,Masahiro Iinuma

The 15th International Conference on Human-Computer Interaction 285 - 290 2013年07月

慣性センサを用いた立ち上がり動作サポートシステムの提案

藤本司,和田親宗

第54回北九州医工学術者会議 2013年02月

他動的な股関節外転運動を妨げる過剰収縮抑制条件の調査

紺原正貴,中野聡太,和田親宗

第54回北九州医工学術者会議 2013年02月

歩行訓練支援のための靴型無線情報取得装置の改良査読有り

和田親宗, 和田太, 杉村行信, 家永貴史, 木室義彦, 辻卓則, 蜂須賀研二

電子情報通信学会論文誌. B, 通信 = The transactions of the Institute of Electronics, Information and Communication Engineers. B 95 ( 11 ) 1499 - 1507 2012年11月

担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

筆者らは,いつでもどこでも歩行訓練が可能な空間を実現するという『u-リハビリ(ユビキタスリハビリ)空間』構想を提唱している.この構想では,(1)日常生活における歩行情報の取得,(2)歩行情報の実時間呈示とそれによる患者自身による客観的な歩行状態の把握を実現する.これにより,従来は定性的であった歩行情報の定量化,リハビリ時の患者への指示の可視化,遠隔リハビリテーションなどを目指している.本論文では,まず歩行情報取得のための靴型計測装置の概要を述べ,臨床での使用結果を踏まえて有効性及び改善課題を整理する.次にその改善課題についてのシステムの改良研究の結果を述べる.臨床使用の結果,開発した歩行訓練システムを使うことで,臨床で用いられている計測装置と同等の歩行情報の取得が可能であること,直線歩行訓練や歩幅調製訓練などを患者一人で繰り返し行うことが可能なことが明らかとなった.また,課題として挙げられた通信デバイスに起因する問題や計測範囲の狭さについて,新しいハードウェア機構やセンサ配置の最適化を行うことで,改良することができた.

その他リンク： https://ci.nii.ac.jp/naid/110009543752

Relationship between Perceptual Intensity of Electrical Stimulation and Electrical Skin Impedance on the Palm 査読有り

Chikamune Wada, Kazunari Yamashita, Tomohisa Inada, Yoshihiko Tagawa

The 10th Asia Pacific Conference on Human Interaction 753 - 754 2012年08月

Estimating standing-up motion by using foot pressure to assist standing up for the elderly 査読有り

Chikamune Wada,Makoto Tokunaga

SICE Annual Conference 2012 1956 - 1958 2012年08月

Improvement Study for measurement accuracy on Wireless Shoe-type Measurement Device to support Walking Rehabilitation 査読有り

Chikamune Wada, Suguru Ikeda, Futoshi Wada, Kenji Hachisuka, Takafumi Ienaga, Yoshihiko Kimuro, Takunori Tsuji

Proceedings of the 2012 International Conference on Complex Medical Engineering 471 - 474 2012年07月

靴型計測装置による歩行時の足部の位置推定

池田克,家永貴史,木室義彦,和田太,蜂須賀研二,和田親宗

第52回北九州医工学術者協会誌 2012年02月

足底圧力情報による立ち上がり動作推定

徳永誠,和田親宗

第52回北九州医工学術者協会誌 2012年02月

Proposal of force feedback method by grasping arm to control upper extremity prosthesis 査読有り

Chikamune Wada,Yuji Akiyama,Masatoshi Hirano,Hisashi Arizono

2011 International Workshop on Smart Info-Media Systems in Asia (SISA2011) 158 - 161 2011年11月

Basic Research on the Method of Presenting Distance Information to the Blind by Means of Gait Measurement 査読有り国際誌

Chikamune Wada,Yukinobu Sugimura,Takafumi Ienaga,Yoshihiko Kimuro

Journal of Medical and Biological Engineering 31 ( 4 ) 283 - 287 2011年08月

指尖容積脈波による精神性ストレス評価法の提案査読有り

萩原知絵, 和田親宗

電子情報通信学会論文誌. A, 基礎・境界 = The transactions of the Institute of Electronics, Information and Communication Engineers. A 94 ( 1 ) 44 - 45 2011年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

指尖容積脈波を用いたストレス評価に関する先行研究では,解析法が複雑であり,リアルタイム評価も困難であった.本論文では,指尖容積脈波を用いた精神性ストレス評価法を提案し,連続的に精神性ストレスの有無を区別できる可能性を示した.

その他リンク： https://ci.nii.ac.jp/naid/110008007083

手のひらの冷覚知覚特性を考慮した仮現運動生成のための刺激呈示法査読有り

岩崎泰典, 堀尾寛, 和田親宗

ライフサポート = / the Society of Life Support Technology [編] 22 ( 4 ) 160 - 167 2010年12月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

For the deaf-blind person, in order to develop communication support device which could handwrite a letter on a palm, we have been studying apparent movement phenomenon by cold stimulus on a palm. From our previous experimental results, it was hypothesized that the reason why the apparent movement was not induced at certain region of palm was difference in perceptive characteristics for cold sensation. Therefore, we proposed new stimulation presentation method to induce apparent movement based on perceptive characteristics for cold sensation. In the first experiment, perceptive characteristics for cold sensation on the palm were investigated. Response time to perceive coldness was used as one perceptive characteristics and that time was measured on 72 regions of palm by using peltier element and thermocouple. As a result, it was found that response time varied with palm region and subject. In the second experiment, an occurrence ratio of apparent movement by using stimulation presenting method based on the response time was compared with that by previous method in which response time was not considered. The difference between stimulation presenting method based on the response time and method without consideration for the response time was that response time was added to stimulus duration in the former method. From the results, it was found the occurrence ratio of apparent movement increased when two cold stimuli were presented by using stimulation presenting method based on the response time at two regions where both of response times were above average.

DOI： 10.5136/lifesupport.22.160