研究者詳細 - 和田　親宗

論文 - 和田　親宗

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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

Scopus

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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

Scopus

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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

Scopus

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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

Scopus

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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

Scopus

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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

Scopus

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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

Scopus

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