Researcher Profile and Settings

Master

Affiliation (Master)

• Faculty of Engineering　Mechanical and Aerospace Engineering　Mechanics and Materials

Affiliation (Master)

• Faculty of Engineering　Mechanical and Aerospace Engineering　Mechanics and Materials

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Profile and Settings

Profile and Settings

• Name (Japanese)

  Takeda

• Name (Kana)

  Ryo

• Name

  201301061400155860

Alternate Names

https://ldc.eng.hokudai.ac.jp/

Achievement

Research Interests

• Biomechanics   Motion Analysis   Real Time Control   Robotics   Inertial Sensor   Joint Mechanics   Gait Analysis   

Research Areas

• Informatics / Mechanics and mechatronics / Biomechanics
• Informatics / Robotics and intelligent systems / Biomechanics

Research Experience

• 2012/09 - Today Faculty of Engineering, Hokkaido University Division of Human Mechanical Systems and Design Assistant Professor
• 2010/04 - 2012/08 Imperial College London Department of Mechanical Engineering Research Associate
• 2009/04 - 2010/03 National Institute of Advanced Industrial Science and Technology Institute for Human Science and Biomedical Engineering Postdoctoral Research Fellow

Education

• 2006/04 - 2009/03  Hokkaido University  Graduate School of Engineering  Division of Human Mechanical Systems and Design
• 2004/04 - 2006/03  Tsukuba University  Graduate School of Science and Engineering
• 2000/04 - 2004/03  University of Tsukuba  Third Cluster of Colleges  College of Engineering Systems

Committee Memberships

• 2015/04 - Today   The Society of Materials Science, Japan (JSMS)   JSMS Planning and Public Relations Committee
• 2014/04 - Today   The Japan Society for Technology of Plasticity (JSTP)   Tohoku & Hokkaido Branch Secretary
• 2014/04 - Today   The Society of Materials Science, Japan (JSMS)   Hokkaido Branch Secretary

Awards

• 2017/04 The Japan Society of Mechanical Engineers Japan Society of Mechanical Engineers Encouragement Award (Research)
   

  受賞者: Ryo Takeda
• 2015/05 The Society of Materials Science, Japan Best Presentation Award, 64th JSMS Academic Meeting
   The Effects of Anterior Cruciate Ligament Bundles on Knee Joint Stability 

  受賞者: Ryo Takeda

Published Papers

• Validity of Wearable Gait Analysis System for Measuring Lower-Limb Kinematics during Timed Up and Go Test

  Yoshiaki Kataoka, Tomoya Ishida, Satoshi Osuka, Ryo Takeda, Shigeru Tadano, Satoshi Yamada, Harukazu Tohyama

  Sensors 24 (19) 6296 - 6296 2024/09/29 

  Few studies have reported on the validity of a sensor-based lower-limb kinematics evaluation during the timed up and go (TUG) test. This study aimed to determine the validity of a wearable gait sensor system for measuring lower-limb kinematics during the TUG test. Ten young healthy participants were enrolled, and lower-limb kinematics during the TUG test were assessed using a wearable gait sensor system and a standard optical motion analysis system. The angular velocities of the hip, knee, and ankle joints in sit-to-stand and turn-to-sit phases were significantly correlated between the two motion analysis systems (R = 0.612–0.937). The peak angles and ranges of motion of hip, knee, and ankle joints in the walking-out and walking-in phases were also correlated in both systems (R = 0.528–0.924). These results indicate that the wearable gait sensor system is useful for evaluating lower-limb kinematics not only during gait, but also during the TUG test.
• Cervical motion analysis using wearable inertial sensors to patients with cervical ossification of posterior longitudinal ligament.

  Satoshi Osuka, Masahiko Takahata, Ryo Takeda, Takeshi Chiba, Hiroaki Hori, Yoshiaki Kataoka, Norimasa Iwasaki, Masahiko Mukaino, Harukazu Tohyama

  Journal of orthopaedic research : official publication of the Orthopaedic Research Society 2024/09/29 

  This study aimed to clarify cervical kinematics during daily activities, including level walking and stair ascending, in patients with cervical ossification of the posterior longitudinal ligament (C-OPLL). Eighteen patients with myelopathy caused by C-OPLL and 18 healthy controls were recruited to participate in the study. The sagittal cervical kinematics during level walking and stair ascent were quantitatively assessed using a motion analysis system based on wearable inertial sensors. The Japanese Orthopaedic Association score, Japanese Orthopaedic Association Cervical Myelopathy Evaluation Questionnaire, Neck Disability Index, and deep sensation in the lower extremities were assessed in all participants. Nine of 18 patients with C-OPLL presented with deep sensory disturbances. Patients with C-OPLL with deep sensory disturbances exhibited different sagittal plane cervical motion patterns than healthy controls during level walking and stair ascent. During the first phase of stair ascent, both patients with C-OPLL and healthy controls flexed their necks to the same degree; however, during the middle and final phases of stair ascent and all phases of level walking, the mean cervical flexion angle of patients with C-OPLL with deep sensory disturbances was significantly higher than that of patients with C-OPLL without deep sensory disturbance and healthy controls. Our data suggest that patients with C-OPLL presenting with deep sensory disturbances are likely to walk with their necks flexed and gaze downward to observe their steps throughout their daily lives. This habitual neck posture may lead to a vicious cycle of cervical kyphosis and worsening of compressive myelopathy.
• Investigation of manufacture variables on the mechanical properties of CFRP prepared by electrodeposition resin molding method

  Md Tansirul Islam, Shinya Honda, Kazuaki Katagiri, Katsuhiko Sasaki, Ryo Takeda

  Mechanics of Advanced Materials and Structures 1 - 16 1537-6494 2024/01/18
• ウェアラブルセンサを用いた頭頸部運動評価システムの妥当性の検討

  大須賀 聡, 高畑 雅彦, 武田 量, 石田 知也, 中田 光海, 舘ヶ澤 翔, 三好 航平, 遠山 晴一

  運動器リハビリテーション 日本運動器科学会 34 (1) 39 - 44 2187-8420 2023/06 

  ウェアラブルセンサを用いた頭頸部運動評価システムにより自動可動域を解析し,妥当性を検証した.対象は健常成人14名とし,ウェアラブルセンサと光学式三次元動作解析装置により頭頸部自動可動域を解析した.2つの測定法により得られた値は有意な相関関係を示し,Bland-Altman分析において一致性を有することが確認された.しかしながら,屈曲,伸展,側屈においては一定の固定誤差が生じる可能性が示唆された.(著者抄録)
• Evaluation of Lower-Limb Kinematics during Timed Up and Go (TUG) Test in Subjects with Locomotive Syndrome (LS) Using Wearable Gait Sensors (H-Gait System).

  Yoshiaki Kataoka, Yuki Saito, Ryo Takeda, Tomoya Ishida, Shigeru Tadano, Teppei Suzuki, Kentaro Nakamura, Akimi Nakata, Satoshi Osuka, Satoshi Yamada, Mina Samukawa, Harukazu Tohyama

  Sensors (Basel, Switzerland) 23 (2) 2023/01/06 [Refereed]
   

  Few studies have dealt with lower-limb kinematics during the timed up and go (TUG) test in subjects with locomotive syndrome (LS). This study aimed to evaluate the characteristics of lower-limb kinematics during the TUG test in subjects with LS using the wearable sensor-based H-Gait system. A total of 140 participants were divided into the non-LS (n = 28), the LS-stage 1 (n = 78), and LS-stage 2 (n = 34) groups based on the LS risk test. Compared with the non-LS group, the LS-stage 1 and LS-stage 2 groups showed significantly smaller angular velocity of hip and knee extension during the sit-to-stand phase. The LS-stage 2 group showed significantly smaller peak angles of hip extension and flexion during the walking-out phase compared to the non-LS group. These findings indicate that the evaluation of the lower-limb kinematics during the TUG test using the H-Gait system is highly sensitive to detect LS, compared with the evaluation of the lower-limb kinematics when simply walking.
• Stent Geometry Optimization for In-Stent Restenosis Prevention Through Fluid–Structure Interaction Analysis

  Varien Janitra Nuralif Susanto, Ryo Takeda, Shinya Honda, Katsuhiko Sasaki

  Lecture Notes in Mechanical Engineering 98 - 105 2195-4356 2023 

  Heart attacks are the most common cause of death in the world in the last decade. Heart attacks are caused by a deficiency of nutrients in the heart muscle cells due to blood flow blockage. Blocked blood flow can be restored by the deployment of a medical device called a stent. However, many studies found that stent deployment may induce plaque formation, known as in-stent restenosis. Previously, there have been attempts to minimize in-restenosis occurrence on stents by redesigning the stent. Optimization algorithms and numerical simulations are employed to search for the best stent design according to preset objective functions and constraints. This paper studies the optimum stent configuration considering the extensively studied restenosis risk factors, such as intimal stress and wall shear stress. For the optimization, a genetic-based optimization algorithm (GA) was used. The risk factors occurrence is analyzed by coupling finite element method (FEM) and computational fluid dynamics (CFD) solvers. Several conflicting objective functions based on the analyzed risk factors and constraints are also applied to the optimization algorithm. As a result, optimum stent configurations are obtained, which have the best size and angles of struts.
• Effect of Heat Curing Temperature for CFRP Fabricated by Electrodeposition Resin Molding Method

  Md Tansirul Islam, Shinya Honda, Kazuaki Katagiri, Katsuhiko Sasaki, Ryo Takeda

  Proceedings of the American Society for Composites - 38th Technical Conference, ASC 2023 115 - 123 2023 

  The new electrodeposition resin molding (EDRM) technique is regarded as a rapid and effective way to produce composite materials. In this study, the composite preparation was done using this technique. The heat curing stage is one of the key steps in this process. The optimization of the many conditions was required because it is a new method. The major objective of this study is to establish the ideal heat curing temperature and time for producing CFRP of the highest grade. In this investigation, two alternative temperature profiles were used. One measured 215°C, the other 230°C. Three different heat curing times-4 hours, 6 hours, and 8 hours-were used for each profile. Static and dynamic characteristics of the prepared CFRP were assessed to determine the impact of these heat curing temperatures and treatment times. Four-point bending tests were done for the static properties, and vibration tests were done for the dynamic qualities to determine the natural frequency and damping. Even though the various heat treatment methods had little impact on vibration characteristics, they had a big impact on bending qualities. The specimens that were held in the oven for 8 hours at 215°C to produce the highest bending strength, however at 230°C, the maximum bending strength was found when it was kept for 6 hours in the oven for treatment.
• Adaptive Vibration Control of Smart Structure Using Deep Reinforcement Learning

  Shinya Honda, Yuta Imura, Katsuhiko Sasaki, Ryo Takeda

  EPI International Journal of Engineering 5 (2) 92 - 97 2615-5109 2022/08/31 

  In this research, the authors developed an adaptive control method using deep reinforcement learning which is a kind of machine learning to suppress the vibration of smart structures. This method just requires information about the control response and input, and don’t require numerical models for the controlled object to design the controller. We experimented to verify the effectiveness of this method. In this experiment, a smart structure fabricated by an aluminum plate and a piezoelectric actuator was used as a controlled object. Three kinds of reinforcement learning algorithms are employed, Deep Q Network (DQN), Deep Deterministic Policy Gradient (DDPG), and Twin Delayed DDPG (TD3), and the control performance is compared. As a result, we succeeded in reducing the  norm of the frequency response to impulse disturbance by up to about 40 dB compared to the uncontrolled case. This demonstrates the applicability of the control method using deep reinforcement learning to adaptive vibration control.
• Bending stiffness variability between a deployable robotic laser osteotome and its insertion device

  Yukiko Tomooka, Georg Rauter, Nicolas Gerig, Ryo Takeda, Philippe Cattin, Manuela Eugster

  Current Directions in Biomedical Engineering 8 (1) 138 - 141 2022/07/30 [Refereed]
  
• Estimation of damping characteristics and optimization of curvilinear fiber shapes for composites fabricated by electrodeposition resin molding

  Shinya Honda, Hiraku Takisawa, Ryo Takeda, Katsuhiko Sasaki, Kazuaki Katagiri

  Mechanics of Advanced Materials and Structures 1537-6494 2022/07/12 [Refereed]
   

  The effect of both curvilinear fiber orientation and thickness distribution on modal damping of carbon fiber reinforced plastics (CFRP) fabricated by electrodeposition resin molding (ERM) was investigated. Tailored fiber placement (TFP) was used to manufacture carbon fiber (CF) performs with continuous curvilinear fiber paths or variable-axial properties. The damping of composites was calculated using the concept of specific damping capacity (SDC). Fiber shapes was optimized to maximize the first modal SDC using particle swarm optimization (PSO). As a result, the optimum fiber shape improves both the first natural frequency and modal SDC in comparison with several unidirectional fiber shapes.
• 10m歩行試験における歩行時下肢キネマティクスがロコモ25に関連する要因の検討

  齋藤 優輝, 片岡 義明, 武田 量, 石田 知也, 但野 茂, 山田 悟史, 大須賀 聡, 中田 光海, 遠山 晴一

  運動器リハビリテーション 日本運動器科学会 33 (2) 142 - 142 2187-8420 2022/06
• Timed up and go testにおける下肢キネマティクスのロコモ重症度に関連する因子

  片岡 義明, 斎藤 優輝, 武田 量, 石田 知也, 但野 茂, 山田 悟史, 大須賀 聡, 中田 光海, 遠山 晴一

  運動器リハビリテーション 日本運動器科学会 33 (2) 144 - 144 2187-8420 2022/06
• wearable sensorを用いた頭頸部運動評価システムの妥当性の検討

  大須賀 聡, 高畑 雅彦, 武田 量, 石田 知也, 中田 光海, 舘ケ澤 翔, 三好 航平, 遠山 晴一

  運動器リハビリテーション 日本運動器科学会 33 (2) 154 - 154 2187-8420 2022/06
• wearable sensorを用いた頭頸部運動評価システムの検者内・検者間信頼性の検討

  舘ケ澤 翔, 大須賀 聡, 高畑 雅彦, 武田 量, 石田 知也, 中田 光海, 三好 航平, 遠山 晴一

  運動器リハビリテーション 日本運動器科学会 33 (2) 155 - 155 2187-8420 2022/06
• ウェアラブルセンサシステムを用いた階段昇降時におけるInitial/Terminal Contactの検出

  武田 量, 大須賀 聡, 山田 悟史, 石田 智也, 遠山 晴一, 但野 茂

  運動器リハビリテーション 日本運動器科学会 33 (2) 177 - 177 2187-8420 2022/06
• Evaluation of gait characteristics in subjects with locomotive syndrome using wearable gait sensors.

  Yuki Saito, Tomoya Ishida, Yoshiaki Kataoka, Ryo Takeda, Shigeru Tadano, Teppei Suzuki, Kentaro Nakamura, Akimi Nakata, Satoshi Osuka, Satoshi Yamada, Mina Samukawa, Harukazu Tohyama

  BMC musculoskeletal disorders 23 (1) 457 - 457 2022/05/14 [Refereed]
   

  BACKGROUND: Individuals with locomotive syndrome (LS) require nursing care services owing to problems with locomotion and the musculoskeletal system. Individuals with LS generally have a reduced walking speed compared with those without LS. However, differences in lower-limb kinematics and gait between individuals with and without LS are not fully understood. This study aimed to clarify the characteristics of the gait kinematics of individuals with LS using wearable sensors. METHODS: We assessed 125 participants (mean age 73.0 ± 6.7 years) who used a public health promotion facility. Based on the 25-question Geriatric Locomotive Function Scale (GLFS-25), these participants were grouped into the non-LS (GLFS-25 < 7), LS-stage 1 (GLFS-25 7-16), and LS-stage 2 (GLFS-25 ≥ 16) groups (larger GLFS-25 scores indicate worse locomotive ability). Spatiotemporal parameters and lower-limb kinematics during the 10-m walk test were analyzed by the "H-Gait system", which is a motion analysis system that was developed by the authors and is based on seven inertial sensors. The peak joint angles during the stance and swing phases, as well as the gait speed, cadence, and step length were compared among all groups. RESULTS: There were 69 participants in the non-LS group, 33 in the LS-stage 1 group, and 23 in the LS-stage 2 group. Compared with the non-LS group, the LS-stage 2 group showed significantly smaller peak angles of hip extension (9.5 ± 5.3° vs 4.2 ± 8.2°, P = 0.002), hip flexion (34.2 ± 8.8° vs 28.5 ± 9.5°, P = 0.026), and knee flexion (65.2 ± 18.7° vs 50.6 ± 18.5°, P = 0.005). The LS-stage 1 and LS-stage 2 groups had a significantly slower mean gait speed than the non-LS group (non-LS: 1.3 ± 0.2 m/s, LS-stage 1: 1.2 ± 0.2 m/s, LS-stage 2: 1.1 ± 0.2 m/s, P < 0.001). CONCLUSIONS: The LS-stage 2 group showed significantly different lower-limb kinematics compared with the non-LS group, including smaller peak angles of hip extension, hip flexion, and knee flexion. It would be useful to assess and improve these small peak joint angles during gait for individuals classified as LS-stage 2.
• Investigations into the Potential of using of Open Source CFD to analyze the Differences in Hemodynamic Parameters for Aortic Dissections (Healthy vs. Stanford Type A and B)

  Ryo Takeda, Fumiya Sato, Hiroichi Yokoyama, Katsuhiko Sasaki, Nobuyuki Oshima, Akiyoshi Kuroda, Hideyoshi Takashima, Chenyu Li, Shinya Honda, Hiroyuki Kamiya

  Annals of Vascular Surgery 79 310 - 323 0890-5096 2022/02 [Refereed][Not invited]
  
• Fluid Structure Interaction Analysis of Aorta Using OpenFOAM and CalculiX

  NARA Toshiki, TAKASHIMA Hideyoshi, LI Chenyu, TAKEDA Ryo, SASAKI Katsuhiko, KURODA Akiyoshi, YOKOYAMA Hiroichi, KAMIYA Hiroyuki

  The Proceedings of The Computational Mechanics Conference 一般社団法人 日本機械学会 2022.35 15-05  2022 [Not refereed]
   

  Currently, biomechanical simulations of blood vessels and organs are widely used in medical research, and it is expected to realize rapid and accurate medical diagnosis by personalized biological simulations for each individual using high-speed and high-precision 3D modeling of the body internal geometry by Multi Detector-row Computed Tomography (MDCT) and Magnetic Resonance Imaging (MRI). In particular, biomechanical simulation approach using Open Source Software (OSS) has been developed for use in the medical field, and recently, its application to more challenging multiphysics simulation has been studied. However, OSS has many issues such as assurance of accuracy and validity of the analysis, the computation time and stability of Fluid-Structure Interaction (FSI), and the lack of analysis functions for complex phenomena. In particular, blood flow simulation using OpenFOAM, a fluid analysis OSS, has issues in the representation of blood pressure changes caused by pulsation and body movement, and the stability of coupled analysis in conjunction with other structural analysis software. In this study, we added the Windkessel model, which is one of the models for expressing blood pressure changes, to OpenFOAM and developed a two-way coupled multi-physics simulation approach using OpenFOAM and CalculiX. As an example of personalized biomechanical simulation, we applied the method to simulate blood flow in the thoracic aorta and evaluated its effectiveness.
• Vibration optimization of laminated composites with curvilinear reinforcing fibers for shell structures

  SAIWAKI Isamu, HONDA Shinya, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo

  The Proceedings of the Dynamics & Design Conference 一般社団法人 日本機械学会 2022 145  2022 

  Tailored Fiber Placement (TFP) is an embroidery technique that enables it possible to design free fiber shapes on base material sheets. The TFP generally creates curved fibers on a flat surface. However, CFRP structures are often used as shell structures rather than as flat plates, and there is not enough research to design fiber shapes on curved surfaces. In this research, we applied our previous optimization method for curved fiber shapes to shell structures. Curved fiber shapes were created by the linear combination of radial basis functions (RBFs) to represent complex fiber shapes. The fiber shape on a curved surface was represented by projecting the fiber shape on a plane surface using a coordinate transformation technique. Using this method, we investigated optimum fiber shapes to improve the first natural frequency of shell structure composites. The results showed that the optimum fiber shape gave higher natural frequencies than the linear fiber orientation. Obtained optimum fiber shape resulted in higher natural frequencies than the linear fiber orientation.
• Damping identification and optimization of laminated composites with curved reinforcing fibers

  Honda Shinya, Takisawa Hiraku, Katagiri Kazuaki, Sasaki Katsuhiko, Takeda Ryo

  NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan 日本学術会議 「機械工学委員会・土木工学・建築学委員会合同IUTAM分科会」 66 163  2022 

  The effect of both curvilinear fiber orientation and the resulting thickness distribution on modal damping of carbon fiber reinforced plastics (CFRP) fabricated by electrodeposition resin molding (ERM) was investigated in this study. Tailored fiber placement (TFP) is employed to manufacture carbon fiber preforms with continuous curvilinear fiber paths. Damping of CFRP fabricated by ERM was calculated using the concept of specific damping capacity (SDC). Optimization of fiber shapes in L-shaped plate model was conducted to maximize the first modal SDC using particle swarm optimization (PSO). As a result, the optimum fiber shape successfully improves both the first natural frequency and modal SDC in comparison with several unidirectional fiber shapes.
• Optimum design of curvilinear reinforcing fiber shapes for CFRP plates fabricated by electrodeposition resin molding method

  HONDA Shinya, TAKISAWA Hiraku, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo

  The Proceedings of OPTIS 一般社団法人 日本機械学会 2022.14 U00010  2022 

  Fiber shape optimization was performed to improve the damping properties of CFRP fabricated by electrodeposition resin molding (EDRM) method. Damping properties of composites were modeled by the specific damping capacity (SDC), and the material damping parameters required for numerical estimation were identified by an inverse analysis using results of experimental modal analysis and finite element analysis. In the optimization, a curvilinear fiber shape that maximizes the first mode SDC was explored. The thickness distribution due to the curvilinear fiber shape was estimated and applied to the finite element analysis. The fiber shapes obtained by the optimization improved the first natural frequencies and mode SDCs compared to several straight fiber orientations, indicating that the curved fiber orientation is effective in improving damping.
• Analysis of 3-D Kinematics Using H-Gait System during Walking on a Lower Body Positive Pressure Treadmill.

  Yoshiaki Kataoka, Ryo Takeda, Shigeru Tadano, Tomoya Ishida, Yuki Saito, Satoshi Osuka, Mina Samukawa, Harukazu Tohyama

  Sensors (Basel, Switzerland) 21 (8) 2021/04/08 

  Recently, treadmills equipped with a lower-body positive-pressure (LBPP) device have been developed to provide precise body weight support (BWS) during walking. Since lower limbs are covered in a waist-high chamber of an LBPP treadmill, a conventional motion analysis using an optical method is impossible to evaluate gait kinematics on LBPP. We have developed a wearable-sensor-based three-dimensional motion analysis system, H-Gait. The purpose of the present study was to investigate the effects of BWS by a LBPP treadmill on gait kinematics using an H-Gait system. Twenty-five healthy subjects walked at 2.5 km/h on a LBPP treadmill under the following three conditions: (1) 0%BWS, (2) 25%BWS and (3) 50%BWS conditions. Acceleration and angular velocity from seven wearable sensors were used to analyze lower limb kinematics during walking. BWS significantly decreased peak angles of hip adduction, knee adduction and ankle dorsiflexion. In particular, the peak knee adduction angle at the 50%BWS significantly decreased compared to at the 25%BWS (p = 0.012) or 0%BWS (p < 0.001). The present study showed that H-Gait system can detect the changes in gait kinematics in response to BWS by a LBPP treadmill and provided a useful clinical application of the H-Gait system to walking exercises.
• Optimal design and evaluation with ground structure based topology optimization

  KAYANO Koki, HONDA Shinya, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo

  The Proceedings of the Dynamics & Design Conference 一般社団法人 日本機械学会 2021 129  2021 

  The aim of this study is to design an optimum CFRP lattice structure for application to a morphing wing. The ground structure based topology method is adopted as the optimization method, and the results are validated by experiments. In this study, to confirm the effectiveness of the optimization method, a simple hook shape was optimized and its stiffness and strength was compared by tensile tests. A 3D printer capable of laminating thermoplastic CFRP was used to fabricate the specimen. The results of tensile tests showed that the optimized specimens exhibited higher stiffness and strength than the reference model, confirming the effectiveness of the proposed method.
• Vibration characteristics of carbon fiber reinforced composites fabricated by electrodeposition molding method

  Hiraku Takisawa, Naoki Hashimoto, Shinya Honda, Kazuaki Katagiri, Katsuhiko Sasaki, Ryo Takeda

  15th International Conference on Motion and Vibration Control, MoViC 2020 2020/12/07 

  The present paper investigates the vibration characteristics of CFRPs including the anisotropic damping properties. Carbon fiber (CF) preforms are prepared by a tailored fiber placement (TFP) machine, and the electrodeposition resin molding (ERM) method is used to impregnate the resin into CF preforms. CFRP plates are fabricated by two different methods which are the ERM and vacuumed assisted resin transfer molding (VaRTM), and experimental modal analysis is conducted to compare the vibration characteristics of those plates. The experimental results show plates fabricated by the ERM exhibit higher damping properties than those by VaRTM. Then, anisotropic damping properties of the present CFRP plates composed of plain weave layers and TFP layers are identified using the finite element analysis (FEA) with the experimental results. In this analysis, the damping properties are modeled by specific damping capacity (SDC) that is defined as the ratio of the dissipated energy and the maximum strain energy in one cycle of loading. Those parameters are determined by minimizing the difference between modal SDCs calculated by the FEA and measured by the experiment. To solve the minimization problem, particle swarm optimization (PSO) is used. Obtained damping parameters enable us to design damping properties more flexibly for CFRPs with arbitrarily shaped fibers.
• Effects of Unweighting on Gait Kinematics During Walking on a Lower-Body Positive Pressure Treadmill in Patients with Hip Osteoarthritis

  Yoshiaki Kataoka, Tomohiro Shimizu, Ryo Takeda, Shigeru Tadano, Yuki Saito, Satoshi Osuka, Tomoya Ishida, Mina Samukawa, Tohru Irie, Daisuke Takahashi, Norimasa Iwasaki, Harukazu Tohyama

  2020/04/10 [Refereed][Not invited]
   

  Background: Hip osteoarthritis (OA) is a musculoskeletal condition that makes walking difficult due to pain induced by weight-bearing activity. Treadmills that support body weight reduce the load on the lower limbs, and those equipped with a lower-body positive pressure (LBPP) device, developed as a new method for unweighting, significantly reduce pain in patients with knee OA. However, the effects of unweighting on gait kinematics remain unclear in patients with hip OA. Therefore, we investigated the effects of unweighting on kinematics in patients with hip OA during walking on a treadmill equipped with an LBPP device.Methods: Fifteen women with hip OA and fifteen age-matched female controls wore a three-dimensional motion analysis system and walked at a comfortable speed on the LBPP treadmill. Data regarding hip pain using a numeric rating scale under three different unweighting conditions (100%, 75%, and 50% bodyweight) were collected. Sagittal plane lower-limb kinematics under each condition were calculated and compared.Results: In the hip OA group, numerical rating scores at the unweighted condition were significantly decreased compared to the 100% bodyweight condition, and sagittal kinematics in the hip and knee joints significantly decreased compared to the healthy controls. In both groups, unweighting significantly decreased the peak hip flexion angle and increased the peak ankle plantarflexion angle during walking.Conclusions: Although unweighting by LBPP decreased pain in the hip OA group, gait kinematics did not improve despite less load on the hip joint. Therefore, clinicians should consider the benefits of pain reduction, rather than improved gait, when considering LBPP treadmill for patients with hip OA.
• Estimation and Optimization of Vibration Damping Characteristics for Composites Fabricated by Electrodeposition Resin Molding Method

  TAKISAWA Hiraku, Honda Shinya, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo

  The Proceedings of the Dynamics & Design Conference 一般社団法人 日本機械学会 2020 105 - 105 2020 

  Our previous research found that CFRPs fabricated by the electrodeposition resin molding (ERM) method exhibited high damping properties. In this research, tailored fiber placement (TFP) was used to make curved fiber shapes, however, those shapes were limited to a parabola and a sine curve. Linear combination of radial basis functions (RBFs) were used to make more complex fiber shapes, and optimum fiber shapes are investigated to improve damping of CFRPs fabricated by the ERM method. Damping is modeled by the specific damping capacity (SDC) which is defined as the ratio of dissipated energy and maximum strain energy, and total damping properties of CFRPs are calculated using finite element analysis (FEA). Before optimization, material SDCs of a plain weave sheet and a TFP layer, which are compositions of CFRPs, are identified by particle swarm optimization (PSO) using the results of experimental modal analysis and FEA. Then, fiber shapes were optimized to maximize the first modal SDC of L-shaped and T-shaped plates using PSO with nonlinear dissipative term. Simultaneously, the thickness distribution which is caused by overlaps or gaps between curved fibers was estimated and applied to a finite element model for more accurate numerical estimation. The results showed that the present optimization of curved fiber shapes including estimation of thickness distribution improves the first modal SDC and decreases the volume of a TFP layer in comparison with unidirectional fiber shapes.

• ロコモティブシンドローム発症の危険因子の定量化のための歩行解析システムの開発

  遠山 晴一, 但野 茂, 武田 量, 岩崎 倫政, 生駒 一憲, 千葉 健

  運動器リハビリテーション 日本運動器科学会 30 (4) 419 - 419 2187-8420 2019/12
• Influence of BMI on Gait Characteristics of Young Adults: 3D Evaluation Using Inertial Sensors

  Valeria Rosso, Valentina Agostini, Ryo Takeda, Shigeru Tadano, Laura Gastaldi

  Sensors 19 (19) 4221  2019/09 [Refereed][Not invited]
  
• Process monitoring of deep drawing using machine learning

  Tomohiro Tsuruya, Musashi Danseko, Katsuhiko Sasaki, Shinya Honda, Ryo Takeda

  IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM 2019- 1227 - 1232 2019/07/01 

  This study proposes a new processing method by using the count rate of the acoustic emission (AE) signal and machine learning. To analyze the AE count, machine learning, using a multilayered neural networks, is implemented for a deep drawing process. In a press processing, a quality inspection is often carried out for each lot in a later process. Once a failure occurs in the process, a large number of defective products may be produced due to the fast processing speed. In order to prevent this, it is important to immediately stop the processing just after the defect occurs. The AE signal data has been often used for monitoring the condition of process. However, it is easily affected by noise and lacks repeatability. Also it is difficult to handle the number of AE data due to its high frequencies of target signals. Therefore, the improvement of the data processing method and recognition rate is required and thus the machine learning approach is applied in this study.
• 三次元歩行計測システムH-Gaitによる階段昇降時の下肢kinematics評価

  大須賀 聡, 武田 量, 但野 茂, 山田 悟史, 片岡 義明, 石田 知也, 遠山 晴一

  運動器リハビリテーション 日本運動器科学会 30 (2) 210 - 210 2187-8420 2019/06
• ロコモティブシンドローム発症の危険因子の定量化のための歩行解析システムの開発

  遠山 晴一, 片岡 義明, 武田 量, 大須賀 聡, 千葉 健, 清水 智弘, 生駒 一憲, 岩崎 倫政, 但野 茂

  運動器リハビリテーション 日本運動器科学会 30 (2) 123 - 123 2187-8420 2019/06
• Vulnerability Analysis on the Interaction between Asymmetric Stent and Arterial Layer

  Achmad Syaifudin, Julendra B. Ariatedja, Yusuf Kaelani, Ryo Takeda, Katsuhiko Sasaki

  Bio-medical Materials and Engineering 30 (3) 309 - 322 2019/05 [Refereed][Not invited]
  
• Vibration characteristic of weight saving boom sprayer by using CFRP

  Satoru TAMAKI, Shinya HONDA, Yohei HOSHINO, Katsuhiko SASAKI, Ryo TAKEDA

  The Proceedings of the Dynamics & Design Conference 2019 102 - 102 2019
• Vibration characteristics of CFRP fabricated by electro-activated deposition molding method

  HASHIMOTO Naoki, HONDA Sinya, KATAGIRI Kazuaki, SASAKI Katsuhiko, TAKEDA Ryo, YAMAGUCHI Shimpei, KAWAKITA Sonomi

  The Proceedings of the Dynamics & Design Conference 一般社団法人 日本機械学会 2019 103 - 103 2019 

  An autoclave molding with prepregs is the most general method of CFRP manufacturing. It is well known that this method is time and energy consuming and prevents the cost reduction of CFRPs. Therefore, aiming to improve CFRP productivity, some manufacturing methods without the autoclave have been proposed such as a vacuumed resin transfer molding（VaRTM）method. The authors have been also proposed a new CFRP manufacturing method that is an electro deposition resin molding（EDRM）method. The EDRM is an application of the electro deposition technology which has been used as a coating technology for automobiles, and it is suitable for mass productions. In our previous studies, static mechanical properties including stiffnesses and strength of CFRPs molded by the EDRM have been investigated, but their dynamic properties have not been done yet. Therefore, in this study, in order to evaluate the vibration characteristics of CFRPs produced by the EDRM, an experimental modal analysis and finite element analysis（FEA） were performed on CFRP specimens with straight and curved reinforcing fibers. The specimens were also manufactured by the VaRTM method and their vibration damping characteristics were compared. It was confirmed from numerical and experimental results that natural frequencies and eigenmode shapes agree well with high accuracy, and the FEA is useful for the specimen manufactured by the EDRM. It is also found that CFRPs produced by the EDRM has greater modal damping ratios than CFRPs by the VaRTM.

• Forming State Recognition in Deep Drawing Process with Machine Learning

  Tomohiro Tsuruya, Musashi Danseko, Katsuhiko Sasaki, Shinya Honda, Ryo Takeda

  Journal of Advanced Mechanical Design, Systems, and Manufacturing 13 (3) 2019 [Refereed][Not invited]
  
• Temperature Dependence on Thermal and Strength Properties of Aluminum Based High Thermal Conductive Composites Containing VGCF-CNT Fillers

  Kohei Fukuchi, Katsuhiko Sasaki, Terumitsu Imanishi, Ryo Takeda

  Mechanical Engineering Journal 2018/04 [Refereed][Not invited]
  
• Development of Asymmetric Stent for Treatment of Eccentric Plaque

  Achmad Syaifudin, Ryo Takeda, Katsuhiko Sasaki

  Bio-Medical Materials and Engineering 29 (3) 299 - 317 2018/03 [Refereed][Not invited]
  
• Deformation Analysis of Self-Expanding Stent Considering Plaque and a New Expanding Mechanism

  Katsuhiko Sasaki, Yukiko Tomooka, Ryo Takeda, Achmad Syaifudin

  EPI International Journal of Engineering 1 (1) 98 - 106 2018/02 [Refereed][Not invited]
  
• 下肢陽圧式トレッドミルによる免荷が変形性股関節症症例の歩行時における下肢キネマティクスに及ぼす影響

  片岡 義明, 入江 徹, 浅野 毅, 高橋 大介, 但野 茂, 武田 量, 山崎 有美, 岩崎 倫政, 遠山 晴一

  北海道整形災害外科学会雑誌 北海道整形災害外科学会 60 (134th suppl) 33 - 33 1343-3873 2018
• Effect of Asymmetric Geometry on the Flexibility of Stent

  Achmad Syaifudin, Ryo Takeda, Katsuhiko Sasaki

  The International Journal of Mechanical Engineering and Sciences 1 (1) 1 - 7 2017/03 [Refereed][Not invited]
  
• Evaluation of the Performances of Two Wearable Systems for Gait Analysis: A Pilot Study

  Laura Gastaldi, Valentina Agostini, Ryo Takeda, Stefano Pastorelli, Shigeru Tadano

  International Journal of Applied Engineering Research 11 (16) 8820 - 8827 0973-4562 2016/11 [Refereed][Not invited]
  
• Experimental and numerical study on phase change material (PCM) for thermal management of mobile devices

  Yusuke Tomizawa, Katsuhiko Sasaki, Akiyoshi Kuroda, Ryo Takeda, Yoshihiko Kaito

  APPLIED THERMAL ENGINEERING 98 320 - 329 1359-4311 2016/04 [Refereed][Not invited]
   

  As mobile devices become more complex and higher in performance despite the smaller size, heat concentration at localized areas has become a problem. In recent years, passive cooling using phase change materials (PCMs) has drawn attention as a thermal management method for mobile devices. PCMs reduce the temperature increase rate due to their latent heat properties. This reduction in the temperature increase rate is called a "delay effect". Moreover, microencapsulated PCMs (MPCMs) are attracting attention because they keep the melted PCMs from leaking. In this study, PCM sheets containing MPCM/polyethylene composite material are investigated for the thermal management of mobile devices. Namely the authors conduct a series of experiments using the PCM sheet with a high thermal conductivity sheet mounted into a simply modeled mobile device. Effects of the mass, the latent heat, the thermal conductivity, the configuration of the PCM sheet, and high thermal conductivity sheet on the temperature of a smart phone simulator are investigated. A finite element analysis (FEA) is also conducted considering the phase change of PCMs to investigate the optimal dimension and shape of PCMs. As a result, the delay effect of PCMs and the effectivity of a copper sheet pasted on the PCMs are verified by experiments. Moreover, FEA shows that using the PCM sheet with high thermal conductivity sheet has an advantage for the thermal management of mobile devices and gives an optimal condition for the PCM sheets. (C) 2015 Elsevier Ltd. All rights reserved.
• Gait characterization for osteoarthritis patients using wearable gait sensors (H-Gait systems)

  Shigeru Tadano, Ryo Takeda, Keita Sasaki, Tadashi Fujisawa, Harukazu Tohyama

  JOURNAL OF BIOMECHANICS 49 (5) 684 - 690 0021-9290 2016/03 [Refereed][Not invited]
   

  The objective of this work was to investigate the possibilities of using the wearable sensors-based H-Gait system in an actual clinical trial and proposes new gait parameters for characterizing OA gait. Seven H-Gait sensors, consisting of tri-axial inertial sensors, were attached to seven lower limb body segments (pelvis, both thighs, both shanks and both feet). The acceleration and angular velocity data measured were used to estimate three-dimensional kinematic parameters of patients during level walking. Three new parameters were proposed to assess the severity of OA based on the characteristics of these joint center trajectories in addition to conventional gait spatio-temporal parameters. The experiment was conducted on ten subjects with knee OA. The kinematic results obtained (hip, knee and ankle joint angles, joint trajectory in the horizontal and sagittal planes) were compared with those from a reference healthy (control) group. As a result, the angle between the right and left knee trajectories along with that of the ankle joint trajectories were almost twice as large (21.3 degrees vs. 11.6 degrees and 14.9 degrees vs. 7.8 degrees) compared to those of the healthy subjects. In conclusion, it was found that the ankle joints during stance abduct less to avoid adduction at the knee as the severity of OA increases and lead to more acute angles (less parallel) between the right and left knee/ankle joints in the horizontal plane. This method was capable to provide quantitative information about the gait of OA patients and has the advantage to allow for out-of laboratory monitoring. (C) 2016 Elsevier Ltd. All rights reserved.
• Strength Evaluation of Composite Material by Indentation

  HIROSE Ryosuke, SASAKI Katsuhiko, TAKEDA Ryo

  The Proceedings of Conference of Hokkaido Branch 一般社団法人 日本機械学会 2016 31 - 32 2016
• Technical challenges using magneto-inertial sensors for gait analysis

  L. Gastaldi, V. Rosso, V. Gabola, V. Agostini, M. M. Lovagnini Frutos, M. Knaflitz, R. Takeda, S. Tadano

  2016 IEEE INTERNATIONAL SYMPOSIUM ON MEDICAL MEASUREMENTS AND APPLICATIONS (MEMEA) 274 - 279 2016 [Refereed][Not invited]
   

  Magneto-Inertial Measurement Units (MIMUs) are gathering an increasing consensus in human motion analysis. However, applications such as clinical gait analysis require reliable, repeatable and accurate measurements of gait parameters up to a level that it is not easily achievable with MIMUs. We pointed out some specific technical challenges that we encountered in the use of the MIMUs-based H-gait system, pertaining to 1) calibration procedure and 2) high dispersion of ankle joint kinematic curves. We described how we solved these issues: 1) shifting from a manual to a semi-automatic calibration procedure and 2) obtaining an optimal MIMUs positioning on the foot. Joint kinematic results were validated against those acquired with a standard electromechanical system (STEP32).
• Estimation of the CoM and CoP using a 3D body scanning systems Validation with force plate: a case study

  D. Borzelli, L. Gastaldi, S. Pastorelli, A. Botter, T. M. M. Vieira, J. Takagi, R. Takeda, S. Tadano

  2016 IEEE INTERNATIONAL SYMPOSIUM ON MEDICAL MEASUREMENTS AND APPLICATIONS (MEMEA) 280 - 285 2016 [Refereed][Not invited]
   

  Human body Center of Mass (CoM) and Center of Pressure (CoP) kinematics are related to stability and balance control. However their evaluation can only be performed in motion analysis lab using different techniques. One of the more accurate is based on the segmental method, in which the body is modelled as a set of rigid bodies, each of which has different mass properties. In this study, we proposed an alternative estimation of the CoM and CoP, based on the segmental method and the 3D scanning of the human body. Knowing the CoM of each segment, the position of the overall CoM and CoP for poses different from the one used during the body acquisition could be predicted. The proposed method was validated by asking to a subject to assume different postures while standing on a force platform by comparing the resulting CoP with the one estimated with the segmental model. Although the approximations introduced in the model results were comparable.
• An Effective Area Considering the Principal Stress to Evaluate Creep Strain Measured by Indentation Test

  A. Takita, K. Sasaki, K. Ohguchi, R. Takeda

  EXPERIMENTAL MECHANICS 55 (6) 1081 - 1091 0014-4851 2015/07 [Refereed][Not invited]
   

  A method to estimate the creep properties by measuring the micro size deformation is required for the FEM analysis considering the creep deformation of the solder joint in-situ. An indentation creep test is one of the effective methods to directly evaluate the creep deformation of solder joint. However, the indentation test does not give the same creep properties as those obtained by the uniaxial creep tests using a bulk specimen. The authors have proposed an indentation test conducted under the constant depth to determine a suitable reference area, which leads to the same creep characteristics as those obtained by the uniaxial creep test. One of the remaining problems of the indentation test is that the reference area cannot be determined without the creep data obtained by the uniaxial creep test using bulk specimens. In this paper, a series of numerical indentation tests under a constant depth were conducted to construct a method to determine a new reference area without creep data obtained from the uniaxial creep test using bulk specimens. The numerical tests were conducted using finite element method (FEM). The numerical tests showed that the distribution of the principal stress plays an important role to determine the reference area of the indentation tests. Finally, it was found that the reference area obtained considering the distribution of the principal stress gives almost the same creep characteristic as those obtained by the uniaxial creep using bulk specimens.
• The role of fibers in the femoral attachment of the anterior cruciate ligament in resisting Tibial displacement

  Yasuyuki Kawaguchi, Eiji Kondo, Ryo Takeda, Keiichi Akita, Kazunori Yasuda, Andrew A. Amis

  Arthroscopy - Journal of Arthroscopic and Related Surgery 31 (3) 435 - 444 1526-3231 2015/03/01 [Not refereed][Not invited]
   

  Purpose The purpose was to clarify the load-bearing functions of the fibers of the femoral anterior cruciate ligament (ACL) attachment in resisting tibial anterior drawer and rotation. Methods A sequential cutting study was performed on 8 fresh-frozen human knees. The femoral attachment of the ACL was divided into a central area that had dense fibers inserting directly into the femur and anterior and posterior fan-like extension areas. The ACL fibers were cut sequentially from the bone: the posterior fan-like area in 2 stages, the central dense area in 4 stages, and then the anterior fan-like area in 2 stages. Each knee was mounted in a robotic joint testing system that applied tibial anteroposterior 6-mm translations and 10° or 15° of internal rotation at 0° to 90° of flexion. The reduction of restraining force or moment was measured after each cut. Results The central area resisted 82% to 90% of the anterior drawer force the anterior fan-like area, 2% to 3% and the posterior fan-like area, 11% to 15%. Among the 4 central areas, most load was carried close to the roof of the intercondylar notch: the anteromedial bundle resisted 66% to 84% of the force and the posterolateral bundle resisted 16% to 9% from 0° to 90° of flexion. There was no clear pattern for tibial internal rotation, with the load shared among the posterodistal and central areas near extension and mostly the central areas in flexion. Conclusions Under the experimental conditions described, 66% to 84% of the resistance to tibial anterior drawer arose from the ACL fibers at the central-proximal area of the femoral attachment, corresponding to the anteromedial bundle the fan-like extension fibers contributed very little. This work did not support moving a single-bundle ACL graft to the side wall of the notch or attempting to cover the whole attachment area if the intention was to mimic how the natural ACL resists tibial displacements. Clinical Relevance There is ongoing debate about how best to reconstruct the ACL to restore normal knee function, including where is the best place for ACL graft tunnels. This study found that the most important area on the femur, in terms of resisting displacement of the tibia, was in the central-anterior part of the femoral ACL attachment, near the roof of the intercondylar notch. The testing protocol did not lead to data that would support using a large ACL graft tunnel that attempts to cover the whole natural femoral attachment area.
• The Role of Fibers in the Femoral Attachment of the Anterior Cruciate Ligament in Resisting Tibial Displacement

  Yasuyuki Kawaguchi, Eiji Kondo, Ryo Takeda, Keiichi Akita, Kazunori Yasuda, Andrew A. Amis

  ARTHROSCOPY-THE JOURNAL OF ARTHROSCOPIC AND RELATED SURGERY 31 (3) 435 - 444 0749-8063 2015/03 [Refereed][Not invited]
   

  Purpose: The purpose was to clarify the load-bearing functions of the fibers of the femoral anterior cruciate ligament (ACL) attachment in resisting tibial anterior drawer and rotation. Methods: A sequential cutting study was performed on 8 freshfrozen human knees. The femoral attachment of the ACL was divided into a central area that had dense fibers inserting directly into the femur and anterior and posterior fan-like extension areas. The ACL fibers were cut sequentially from the bone: the posterior fan-like area in 2 stages, the central dense area in 4 stages, and then the anterior fan-like area in 2 stages. Each knee was mounted in a robotic joint testing system that applied tibial anteroposterior 6-mm translations and 10 degrees or 15 degrees of internal rotation at 0 degrees to 90 degrees of flexion. The reduction of restraining force or moment was measured after each cut. Results: The central area resisted 82% to 90% of the anterior drawer force; the anterior fan-like area, 2% to 3%; and the posterior fan-like area, 11% to 15%. Among the 4 central areas, most load was carried close to the roof of the intercondylar notch: the anteromedial bundle resisted 66% to 84% of the force and the posterolateral bundle resisted 16% to 9% from 0 degrees to 90 degrees of flexion. There was no clear pattern for tibial internal rotation, with the load shared among the posterodistal and central areas near extension and mostly the central areas in flexion. Conclusions: Under the experimental conditions described, 66% to 84% of the resistance to tibial anterior drawer arose from the ACL fibers at the central-proximal area of the femoral attachment, corresponding to the anteromedial bundle; the fan-like extension fibers contributed very little. This work did not supportmoving a single-bundle ACL graft to the sidewall of the notch or attempting to cover the whole attachment area if the intention was to mimic how the natural ACL resists tibial displacements.
• Effects of plaque lengths on stent surface roughness

  Achmad Syaifudin, Ryo Takeda, Katsuhiko Sasaki

  BIO-MEDICAL MATERIALS AND ENGINEERING 25 (2) 189 - 202 0959-2989 2015 [Refereed][Not invited]
   

  The physical properties of the stent surface influence the effectiveness of vascular disease treatment after stent deployment. During the expanding process, the stent acquires high-level deformation that could alter either its microstructure or the magnitude of surface roughness. This paper constructed a finite element simulation to observe the changes in surface roughness during the stenting process. Structural transient dynamic analysis was performed using ANSYS, to identify the deformation after the stent is placed in a blood vessel. Two types of bare metal stents are studied: a Palmaz type and a Sinusoidal type. The relationship between plaque length and the changes in surface roughness was investigated by utilizing three different length of plaque; plaque length longer than the stent, shorter than the stent and the same length as the stent. In order to reduce computational time, 3D cyclical and translational symmetry was implemented into the FE model. The material models used was defined as a multilinear isotropic for stent and hyperelastic for the balloon, plaque and vessel wall. The correlation between the plastic deformation and the changes in surface roughness was obtained by intermittent pure tensile test using specimen whose chemical composition was similar to that of actual stent material. As the plastic strain is achieved from FE simulation, the surface roughness can be assessed thoroughly. The study found that the plaque size relative to stent length significantly influenced the critical changes in surface roughness. It was found that the length of stent which is equal to the plaque length was preferable due to the fact that it generated only moderate change in surface roughness. This effect was less influential to the Sinusoidal stent.
• Drift Removal for Improving the Accuracy of Gait Parameters Using Wearable Sensor Systems

  Ryo Takeda, Giulia Lisco, Tadashi Fujisawa, Laura Gastaldi, Harukazu Tohyama, Shigeru Tadano

  SENSORS 14 (12) 23230 - 23247 1424-8220 2014/12 [Refereed][Not invited]
   

  Accumulated signal noise will cause the integrated values to drift from the true value when measuring orientation angles of wearable sensors. This work proposes a novel method to reduce the effect of this drift to accurately measure human gait using wearable sensors. Firstly, an infinite impulse response (IIR) digital 4th order Butterworth filter was implemented to remove the noise from the raw gyro sensor data. Secondly, the mode value of the static state gyro sensor data was subtracted from the measured data to remove offset values. Thirdly, a robust double derivative and integration method was introduced to remove any remaining drift error from the data. Lastly, sensor attachment errors were minimized by establishing the gravitational acceleration vector from the acceleration data at standing upright and sitting posture. These improvements proposed allowed for removing the drift effect, and showed an average of 2.1 degrees, 33.3 degrees, 15.6 degrees difference for the hip knee and ankle joint flexion/extension angle, when compared to without implementation. Kinematic and spatio-temporal gait parameters were also calculated from the heel-contact and toe-off timing of the foot. The data provided in this work showed potential of using wearable sensors in clinical evaluation of patients with gait-related diseases.
• Flexion-extension Knee Joint Motion Implementation Using a 6 Axis Robotic Manipulator Platform

  Ryo Takeda, Ferdinando Rodriguez y Baena, Andrew Amis

  The International Symposium on Interdisciplinary Research and Education on Medical Device Developments 85 - 87 2013/09 [Refereed][Not invited]
  
• Three Dimensional Gait Analysis Using Wearable Acceleration and Gyro Sensors Based on Quaternion Calculations

  Shigeru Tadano, Ryo Takeda, Hiroaki Miyagawa

  SENSORS 13 (7) 9321 - 9343 1424-8220 2013/07 [Refereed][Not invited]
   

  This paper proposes a method for three dimensional gait analysis using wearable sensors and quaternion calculations. Seven sensor units consisting of a tri-axial acceleration and gyro sensors, were fixed to the lower limbs. The acceleration and angular velocity data of each sensor unit were measured during level walking. The initial orientations of the sensor units were estimated using acceleration data during upright standing position and the angular displacements were estimated afterwards using angular velocity data during gait. Here, an algorithm based on quaternion calculation was implemented for orientation estimation of the sensor units. The orientations of the sensor units were converted to the orientations of the body segments by a rotation matrix obtained from a calibration trial. Body segment orientations were then used for constructing a three dimensional wire frame animation of the volunteers during the gait. Gait analysis was conducted on five volunteers, and results were compared with those from a camera-based motion analysis system. Comparisons were made for the joint trajectory in the horizontal and sagittal plane. The average RMSE and correlation coefficient (CC) were 10.14 deg and 0.98, 7.88 deg and 0.97, 9.75 deg and 0.78 for the hip, knee and ankle flexion angles, respectively.
• Active vs. Passive DoF Release during Robot Assisted Knee Anterior Posterior Drawer Tests

  Ryo Takeda, Ferdinando Rodriguez y Baena, Andrew Amis

  Proceedings of the 4th Hamlyn Symposium on Medical Robotics 87 - 88 2011/06 [Refereed][Not invited]
  
• Usage of Industrial Manipulator for Joint Biomechanical Testing

  Ryo Takeda, Ferdinando Rodriguez y Baena, Andrew Amis

  2010 Young Researchers Futures meeting on Medical Robotics in Surgery and Rehabilitation 37 - 37 2010/09 [Refereed][Not invited]
  
• G0200-2-5 3-Dimensional Gait Analysis using Wearable Acceleration and Gyro Sensors

  MIYAGAWA Hiroaki, TAKEDA Ryo, TADANO Shigeru

  The proceedings of the JSME annual meeting 一般社団法人日本機械学会 2010 63 - 64 2010 

  Gait analysis is important for evaluation of walk ability and rehabilitation effect. We propose a new method for gait analysis using wearable acceleration and gyro sensors based on quaternion calculations. In this method, each subject fixed seven sensor units which consisted of a tri-axis acceleration sensor and three single axis gyro sensors on their body segments. Acceleration and angular velocity data detected from each sensor unit were corrected during level walking. Initial orientations of sensor units were shown as inclinations from gravity axis by using acceleration data during upright positioning in the trial. Angular displacements of sensor units were estimated using angular velocity data during through the trial. An original algorithm based on quaternion calculation was used for the orientation estimations. Each orientation of sensor unit was transformed to orientation of body segment by rotation matrix obtained from calibration trial. Body segment orientations were used for consisting 3-D stick animation of subject during trial for gait representation. Measurement and analysis were applied for five subjects. The results were compared with results from camera system to focus on the joint angle. The joint angles showed the same tendency with similar joint angle values obtained in both systems. The portability without spatial constraints of this sensor system could improve the capability for clinical applications based on the gait analysis.
• Gait posture estimation using wearable acceleration and gyro sensors

  Ryo Takeda, Shigeru Tadano, Akiko Natorigawa, Masahiro Todoh, Satoshi Yoshinari

  JOURNAL OF BIOMECHANICS 42 (15) 2486 - 2494 0021-9290 2009/11 [Refereed][Not invited]
   

  A method for gait analysis using wearable acceleration sensors and gyro sensors is proposed in this work. The volunteers wore sensor units that included a tri-axis acceleration sensor and three single axis gyro sensors. The angular velocity data measured by the gyro sensors were used to estimate the translational acceleration in the gait analysis. The translational acceleration was then subtracted from the acceleration sensor measurements to obtain the gravitational acceleration, giving the orientation of the lower limb segments. Segment orientation along with body measurements were used to obtain the positions of hip, knee, and ankle joints to create stick figure models of the volunteers. This method can measure the three-dimensional positions of joint centers of the hip, knee, and ankle during movement. Experiments were carried out on the normal gait of three healthy volunteers. As a result, the flexion-extension (F-E) and the adduction-abduction (A-A) joint angles of the hips and the flexion-extension (F-E) joint angles of the knees were calculated and compared with a camera motion capture system. The correlation coefficients were above 0.88 for the hip F-E, higher than 0.72 for the hip A-A, better than 0.92 for the knee F-E. A moving stick figure model of each volunteer was created to visually confirm the walking posture. Further, the knee and ankle joint trajectories in the horizontal plane showed that the left and right legs were bilaterally symmetric. (C) 2009 Elsevier Ltd. All rights reserved.
• Gait Analysis using Acceleration and Gyro Sensors

  Ryo Takeda

  Hokkaido University 2009/03 [Refereed][Not invited]
  
• Gait analysis using gravitational acceleration measured by wearable sensors

  Ryo Takeda, Shigeru Tadano, Masahiro Todoh, Manabu Morikawa, Minoru Nakayasu, Satoshi Yoshinari

  JOURNAL OF BIOMECHANICS 42 (3) 223 - 233 0021-9290 2009/02 [Refereed][Not invited]
   

  A novel method for measuring human gait posture using wearable sensor units is proposed. The sensor units consist of a tri-axial acceleration sensor and three gyro sensors aligned on three axes. The acceleration and angular velocity during walking were measured with seven sensor units worn on the abdomen and the lower limb segments (both thighs, shanks and feet). The three-dimensional positions of each joint are calculated from each segment length and joint angle. joint angle can be estimated mechanically from the gravitational acceleration along the anterior axis of the segment. However. the acceleration data during walking includes three major components; translational acceleration, gravitational acceleration and external noise. Therefore, an optimization analysis was represented to separate only the gravitational acceleration from the acceleration data. Because the cyclic patterns of acceleration data can be found during constant walking, a FFT analysis was applied to obtain some characteristic frequencies in it. A pattern of gravitational acceleration was assumed using some parts of these characteristic frequencies. Every joint position was calculated from the pattern under the condition of physiological motion range of each joint. An optimized pattern of the gravitational acceleration was selected as a solution of an inverse problem. Gaits of three healthy Volunteers were measured by walking for 20s on a flat floor. As a result, the acceleration data of every segment was measured simultaneously. The characteristic three-dimensional walking could be shown by the expression using a stick figure model. In addition, the trajectories of the knee joint in the horizontal plane could be checked by visual imaging on a PC. Therefore, this method provides important quantitive information for gait diagnosis. (C) 2008 Elsevier Ltd. All rights reserved.
• Human Gait Analysis using Wearable Sensors of Acceleration and Angular Velocity

  R. Takeda, S. Tadano, M. Todoh, S. Yoshinari

  IFMBE Proceedings 23 1069 - 1072 1680-0737 2009 [Refereed][Not invited]
   

  This work proposes a method for measuring human gait posture using wearable sensors. The sensor used consist of a tri-axial acceleration sensor and three gyro sensors aligned on three axes. These are worn on the abdomen and the lower limb segments (both thighs, both shanks and both feet) to measure acceleration and angular velocity during walking. Three dimensional positions of each lower limb joint are calculated from segment lengths and joint angles. Segment lengths are calculated by physical measurement and joint angles can be estimated mechanically from the gravitational acceleration along the anterior axis of the segments. However, the acceleration data during walking includes three major components translational acceleration, gravitational acceleration and external noise. Therefore, an optimization analysis was represented to separate only the gravitational acceleration from the acceleration data. Because the cyclic patterns of acceleration data can be found during constant walking, a FFT analysis was applied to obtain some characteristic frequencies. A pattern of gravitational acceleration was assumed using some parts of these characteristic frequencies. Every joint position was calculated from the pattern under the condition of physiological motion range of each joint. An optimized pattern of the gravitational acceleration was selected as a solution of an inverse problem. Three healthy volunteers walking straight for 20 seconds on a flat floor were measured. For comparison reflective markers were also placed on the volunteers for camera recordings. As a result, the characteristic three-dimensional walking of each volunteer could be expressed using a stick figure model. The trajectories of the knee joint in the horizontal plane were checked by images on PC. Therefore, this method provides important quantitive information for gait diagnosis.
• Gait posture estimation by wearable acceleration and gyro sensor

  R. Takeda, S. Tadano, A. Natorigawa, M. Todoh, S. Yoshinari

  IFMBE Proceedings 25 (9) 111 - 114 1680-0737 2009 [Refereed][Not invited]
   

  A method for gait analysis using wearable acceleration sensors and gyro sensors is proposed in this work. The volunteers wore small sensor unit that included a tri-axial acceleration sensor and three mono-axis gyro sensors. The angular velocity data measured by gyro sensors were used to estimate the translational acceleration during gait. The translational acceleration was then subtracted from the acceleration sensor measurements to obtain the gravitational acceleration, giving posture of lower limb segments. Segment posture along with body measurements were used to obtain the three dimensional positions of joint centers for hip, knee and ankle during gait. Experiments were carried out on normal gait of three healthy volunteers. As a result, the flexionextension and the adduction-abduction angle of the hips and the flexion angle of knees were calculated and compared with a camera. The correlation coefficients were 0.888 for the flexionextension angle of hip, 0.721 for the internal-external rotation angle of hip, 0.924 for the flexion angle of knee. In addition, knee and ankle joint trajectories in the horizontal plane showed that the both right left and legs were bilaterally symmetric. © 2009 Springer-Verlag.
• GAIT ANALYSIS USING WIRELESS ACCELERATION SENSORS AND GYRO SENSORS(1B3 Orthopaedic & Rehabilitation Biomechanics III)

  Takeda Ryo, Tadano Shigeru, Todoh Masahiro, Yoshinari Satoshi

  Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics The Japan Society of Mechanical Engineers 2007 (3) S35  2007/11 [Refereed][Not invited]
  

MISC

• Evaluation of electric properties for carbon fiber reinforced plastics fabricated by electrodeposition resin molding method.

  清水佑音, 本田真也, 佐々木克彦, 武田量, 片桐一彰  Dynamics & Design Conference (CD-ROM)  2023-  2023
• Topological Optimization considering Thermal Deformation of a Cast Plate Structural Design

  上田修生, 本田真也, 佐々木克彦, 武田量, 鈴木逸人, 戸羽篤也, 鶴谷知洋  日本材料学会学術講演会講演論文集(CD-ROM)  70th-  2021
• Estimation of Damping Characteristics and Optimization of Curved Fiber Orientation for Composites Fabricated by Electrodeposition Resin Molding

  瀧澤拓, 本田真也, 片桐一彰, 佐々木克彦, 武田量  構造強度に関する講演会講演集  63rd-  2021
• ロコモ度が10m歩行試験における下肢キネマティクスに与える影響の検討

  齋藤優輝, 齋藤優輝, 片岡義明, 武田量, 但野茂, 但野茂, 石田知也, 山田悟史, 大須賀聡, 遠山晴一  運動器リハビリテーション  32-  (1)  2021
• Timed up and go testにおける下肢kinematicsによるロコモティブシンドロームのリスク因子の検討

  片岡義明, 片岡義明, 斎藤優輝, 武田量, 石田知也, 但野茂, 但野茂, 山田悟史, 大須賀聡, 遠山晴一  運動器リハビリテーション  32-  (1)  2021
• 医療人のための流体力学 入門 第5回 数式が苦手でもわかる流体力学の基礎から循環器領域への応用まで：血流シミュレーション

  武田 量, 横山博一  INNERVISION  34-  (9)  124  -128  2019/09  [Not refereed][Invited]
  
• ロコモティブシンドローム発症の危険因子の定量化のための歩行解析システムの開発

  遠山 晴一, 片岡 義明, 武田 量, 大須賀 聡, 千葉 健, 清水 智弘, 生駒 一憲, 岩崎 倫政, 但野 茂  運動器リハビリテーション  30-  (2)  123  -123  2019/06  [Not refereed][Not invited]
  
• 三次元歩行計測システムH-Gaitによる階段昇降時の下肢kinematics評価

  大須賀 聡, 武田 量, 但野 茂, 山田 悟史, 片岡 義明, 石田 知也, 遠山 晴一  運動器リハビリテーション  30-  (2)  210  -210  2019/06  [Not refereed][Not invited]
  
• Fluid-Structure Interaction Analysis of Aortic Dissection Using Open Source

  CHEN Junnan, 佐々木克彦, 本田真也, 武田量, 大島伸行, 黒田明慈, 横山博一, LI Chenyu, 高嶋英厳  日本機械学会計算力学講演会論文集(CD-ROM)  32nd-  2019
• Blood Flow CFD Simulation considering Various Types of Aortic Dissection

  佐藤史弥, 武田量, 佐々木克彦, 本田真也, 大島伸行, 横山博一  日本機械学会年次大会講演論文集(CD-ROM)  2019-  2019
• Gait measurements in the transverse plane using a wearable system: An experimental study of test-retest reliability

  V. Rosso, L. Gastaldi, V. Agostini, R. Takeda, S. Tadano  I2MTC 2017 - 2017 IEEE International Instrumentation and Measurement Technology Conference, Proceedings  2017/07/05  [Not refereed][Not invited]
   

  3D gait analysis comprises the study of kinematics in the sagittal, coronal, and transverse planes. The transverse plane measurements are usually less used and generally show the lowest reliability. Nevertheless, the knee and ankle joint center trajectories, in the transverse plane, provide new parameters that may be important in clinical gait analysis. The aim of this study is to analyze the test-retest variability of these parameters. Gait measurements were performed using H-Gait, a wearable system based on magnetic and inertial sensors. A normal weight and an overweight subject were recruited and were asked to walk at their preferred speed for 6 trials. For both of them, the angle between the right and left knee and ankle joint center trajectories were analyzed. Overall, results showed a standard deviation across trials always lower than 2°. This small standard deviation was found also in the overweight subject, for whom it is usually challenging to obtain reliable gait measurements. In addition, a greater knee angle between the right and left joint center trajectories was found in the overweight subject compared to the normal weight. The promising results of this study suggest that the new parameters introduced might be suitable to assess gait of subjects with different anthropometric characteristics.
• The Effects of Unweighting by a Lower Body Positive Pressure Treadmill on 3-D Gait Kinematics.

  Yoshiaki Kataoka, Kentaro Homan, Ryo Takeda, Shigeru Tadano, Takeshi Chiba, Harukazu Tohyama  The 63th Annual Meeting of Orthopaedic Research Society (ORS)  2017/03  [Not refereed][Not invited]
  
• 流体解析による大動脈解離後の血流評価および壁面せん断応力の推定

  木島雄大, 武田量, 横山博一, 黒田明慈, 大島伸行, 佐々木克彦  日本機械学会バイオフロンティア講演会講演論文集(CD-ROM)  28th-  2017
• 1F31 The Measurements of the Anterior Cruciate Ligament Bundles on the Knee Joint Load

  HIRANO Yuki, TAKEDA Ryo, OKUZUMI Keisuke, SASAKI Katsuhiko  バイオエンジニアリング講演会講演論文集  2016-  (28)  "1F31  -1"-"1F31-5"  2016/01/09  

  The objective of this study was to clarify the contribution of the anterior cruciate ligament (ACL) on the knee joint stability. The ACL consists of three ligament bundles, each with their own different function. Based on the ACL triple bundle theory, a porcine stifle joint with the anteromedial bundle (AMB), intermediate bundle (1MB) and posteromedial bundle (PLB) was prepared. The knee joint was placed in a material testing machine capable of releasing/constraining 5 DoFs of the knee. The load contribution of each bundle was estimated by, sequentially cutting each bundle from the knee joint and measuring the load during an anterior-posterior drawer test. As a result, large decrease in the load contribution was observed when 1MB and PLB were cut, however only a small contribution was seen for the AMB.
• A212 The Effect of PCL Bundles on Knee Joint Stability

  TAKEDA Ryo, OKUZUMI Keisuke, SASAKI Katsuhiko  Proceedings of the ... JSME Conference on Frontiers in Bioengineering  2015-  (26)  95  -96  2015/10/01
• OS8-2 A NOVEL DRIFT REMOVAL METHOD FOR GAIT ANALYSIS USING WEARBLE SENSORS(OS8: Wearable Technologies for Rehabilitation)

  Takeda Ryo, Lisco Giulia, Fujisawa Tadashi, Gastaldi Laura, Pastorelli Stefano, Tohyama Harukazu, Tadano Shigeru  Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics  2015-  (8)  111  -111  2015/09/16
• PS5-9 INVESTIGATIONS OF THE LOAD CONTRIBUTIONS OF THE PM AND THE AL BUNDLES OF THE PCL(PS5: Poster Short Presentation V,Poster Session)

  Takeda Ryo, Okuzumi Keisuke, Kawaguchi Yasuyuki, Sasaki Katsuhiko  Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics  2015-  (8)  307  -307  2015/09/16
• PS4-14 EVALUATION OF A METHOD FOR IDENTIFING KNEE KOINT COR USING IMUS(PS4: Poster Short Presentation IV,Poster Session)

  Yu Lu, Okuzimi Keisuke, Takeda Ryo, Sasaki Katsuhiko  Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics  2015-  (8)  292  -292  2015/09/16
• PS3-4 DEVELOPMENT OF ASYMMETRIC STENT FOR TREATMENT OF ECCENTRIC PLAQUE(PS3: Poster Short Presentation III,Poster Session)

  Syaifudin Achmad, Takeda Ryo, Sasaki Katsuhiko  Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics  2015-  (8)  265  -265  2015/09/16
• PS3-11 MECHANICAL INFLUENCE OF ADVANCED SHAPE-MEMORY ALLOY STENTS DURING DEPLOYMENT(PS3: Poster Short Presentation III,Poster Session)

  Tomooka Yukiko, Sasaki Katsuhiko, Takeda Ryo  Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics  2015-  (8)  272  -272  2015/09/16
• S0220304 Analysis of Stent Expansion Considering Blood Deformation Due to Pulse Flow

  HOSHINO Amane, KURODA Akiyoshi, Sasaki Katsuhiko, Takeda Ryo  Mechanical Engineering Congress, Japan  2015-  "S0220304  -1"-"S0220304-5"  2015/09/13  

  Stenting is a common treatment of stenosis. One of problems of stent treatment is restenosis. Local hemodynamic factor such as low wall shear stress (WSS) is one of the reasons for restenosis. Therefore, blood flow analyses have been performed to clarify the restenosis mechanism. Fluid-Structure Interaction (FSI) is used for blood flow analysis to consider the interaction between fluid pressure and structure deformation. In this research, the effects of the deformed vessel by stenting and pulsating flow are analyzed using FSI. The stent expansion analysis was performed to obtain the deformed shape using FEM analysis software ANSYS Mechanical APDL. FSI analysis was performed to examine the effect of a pulsating vessel using ANSYS Workbench. An initial stent model was made based on the shape of before the expansion. The expanded stent model was also made based on the shape of the expanded stent. To reveal the effect of pulsatile on the blood flow after the stenosis, two boundary conditions were employed; rigid wall and FSI. Inlet flow rate was assumed to be expressed by a periodic function to reproduce the pulsating flow in the carotid artery. The results of velocity, pressure difference and WSS are shown for each model and condition. In the case of rigid wall, WSS at the stenting site is reduced by the expansion of the vessel.
• J1630201 Evaluation of a Method for Identifying Knee Joint CoR Using IMUs

  YU Lu, OKUZUMI Keisuke, TAKEDA Ryo, SASAKI Katsuhiko  Mechanical Engineering Congress, Japan  2015-  "J1630201  -1"-"J1630201-4"  2015/09/13  

  Patients suffering from knee joint damage are generally only provided with subjective, qualitative feedback form physicians. This research sets the foundation for providing a quantitative, non-invasive feedback for knee joint damage by finding the center of rotation (CoR) of the knee joint. Knee joint motion analysis is usually performed through camera based optical tracking systems. Although these standard technologies allow a complete 3-D kinematics of knee, they require a dedicated laboratory. In this research a novel method of utilizing IMUs to obtain knee CoR is proposed. The merits of utilizing IMUs derives from its compact size, short diagnose time, thus putting less burden on patients. With IMU, acceleration and angular velocity can be measured. IMUs were fixed to the thigh and shank to measure the instantaneous CoR of the knee. Since the instantaneous CoR of the knee is different during normal and damaged condition, by obtaining the instantaneous CoR of the knee, one can quantitatively evaluate the conditions of the knee and provide outcome evaluation after surgery. It was found that for extension motion, good correlation coefficient was obtained from IMU and camera. However flexion motion showed much larger result than camera. This is assumed as the effect of inertia. In addition, calculating a 3D motion in a 2D plane may be a crucial reason effecting results. However it can be concluded that utilizing IMUs to diagnose knee function is adoptable in clinical fields for its easy accessibility and less burdens on patients.
• S0220305 Self-Expandable Stent Deployment Analysis Using Advanced Shape-Memory Alloy

  TOMOOKA Yukiko, SASAKI Katsuhiko, TAKEDA Ryo  Mechanical Engineering Congress, Japan  2015-  "S0220305  -1"-"S0220305-5"  2015/09/13  

  This paper describes an effect of using new ferrous polycrystalline shape-memory alloy showing huge superelasticity and higher stiffness as a self-expanding stent material. In this research, stent deployment analysis was conducted by using finite element analysis (FEM) software ANSYS 15.0. Nitinol self-expanding stents are widely used for artery stenosis treatments due to their high flexibility. However, the radial stiffness of self-expanding stents is low compared to balloon-expanding stents. Stent, artery, plaque, and sheath models were made for FEM analyses and the analytical results after deployment of nitinol and ferrous alloy stents were compared. In addition, two methods of the unsheathing were studied: (1) the conventional method where a stent comes out from one end of the sheath and (2) a new method in which stent comes out from the center of the sheath. FEM results showed that the radial force of the stent made of the new ferrous alloy was higher than those of nitinol. Meaning that the ferrous alloy stent displaces the plaque more than the nitinol stent. Furthermore, the plaque was displaced more using the new method of unsheathing, and the ends of the artery without the plaque showed smaller displacement. These results suggest the effectiveness of using the ferrous alloy for self-expanding stent.
• G0200303 Graphical User Interface for H-Gait and Gait Application for Treadmill Walking and Snow Road Walking

  FUJISAWA Tadashi, TAKEDA Ryo, TODOH Masahiro, TOHYAMA Harukazu, TADANO Shigeru  Mechanical Engineering Congress, Japan  2015-  "G0200303  -1"-"G0200303-5"  2015/09/13  

  The 'H-Gait' is a wearable sensor based gait analysis system intended for evaluating the walking ability of a person. The work reported here proposes to advance the 'H-Gait' system by addressing some key features of usability and investigating the effects of walkways on gait. First, the usability issue has been addressed by developing a bespoke GUI for 'H-Gait'. This GUI was capable of showing a step by step gait measurement operation manual through graphic illustrations and presenting the result of the gait analysis by a moving 3D wire frame model in addition to gait parameters. Second, the walkway effects were investigated by comparing the kinematic and spatio-temporal parameters obtained from 'H-Gait' system of normal overground, treadmill and snow road walking. It was found that treadmill walking decreased the stride by 2.2% and increased the cadence by 3.0% when compared with those of overground. The result of regression analysis of each lower joint angle between overground and treadmill walking showed more than 0.89 correlation coefficient and more than 0.95 coefficient of determination. This means there were no significant difference between overground and treadmill walking. It was found that snow road walking increased ankle dorsi-flexion angle at toe-off by 20% and hip flexion angles' mean absolute difference by 10deg.
• 脛骨変位に抗して膝前十字靱帯大腿骨付着部線維へ伝達される力はその部位によって異なる Roboticsを用いた生体力学研究

  河口 泰之, 近藤 英司, 武田 量, Halewood Camilla, 秋田 恵一, Amis Andrew A, 安田 和則  日本整形外科学会雑誌  89-  (8)  S1434  -S1434  2015/09  [Not refereed][Not invited]
  
• B205 The Effect of Different Ligament Reconstruction on Knee Joint Range of Movement and Load

  OKUZUMI Keisuke, TAKEDA Ryo, Yu Lu, SASAKI Katsuhiko  Proceedings of the ... JSME Conference on Frontiers in Bioengineering  2014-  (25)  115  -116  2014/10/02
• S0220204 Effect of balloon shape in treatment of eccentric plaque considering the changes in stent surface roughness

  SYAIFUDIN Achmad, TAKEDA Ryo, SASAKI Katsuhiko  Mechanical Engineering Congress, Japan  2014-  "S0220204  -1"-"S0220204-4"  2014/09/07  

  The changes in physical surface condition after expansion of balloon expandable stent are known as the primary cause of some serious problem following narrowed arteries treatment. The shape of a balloon in the treatment of eccentric plaque, which is majority form of plaque, is hypothesized influencing stent surface roughness. In this paper, the influence of the balloon shape on the changes in surface roughness will be observed using finite element method. Transient nonlinear structural analyses of eccentric plaque are built to identify the deformation. General-purpose software of finite element method such as ANSYS is used for the structural analyses. Material properties utilized in the simulation are 316 stainless steel for the stent; polyethylene terephthalate (PET) for the balloon; hypo cellular for the plaque; and carotid artery for the vessel wall. 3D symmetrical model will be developed in order to reduce computational time. Type Palmaz stent is determined for modeling in the structural analysis. Type cylindrical and offset balloon shape is chosen in the analysis, which one gives better treatment for eccentric plaque. The eccentric plaque is designed having a slight longer length than the stent, which is covering almost 75% blood vessel hole so that covers in one side of vessel wall surface and another side is allowed free from plaque disruption. The material models are defined as multilinear isotropic for stent and hyperelastic for the balloon, plaque, and arterial wall. The finite element analysis indicated that offset balloon shape succeeds to reduce stress intensity area on the vessel wall and helps to improve foreshortening and dogboning effects. Nevertheless, several structural developments of Palmaz stent should be conducted to adapt the expansion direction of offset balloon because its directional expansion also increase plastic deformation of another stent struts.
• G0210104 Knee Joint Center of Rotation Estimation using Inertial Sensor

  TAKEDA Ryo, YU Lu, OKUZUMI Keisuke, SASAKI Katsuhiko  Mechanical Engineering Congress, Japan  2014-  "G0210104  -1"-"G0210104-4"  2014/09/07  

  This paper proposes a novel method for estimating the knee joint center of rotation (CoR) using inertial sensors. The inertial sensors used in this work contain tri-axial accelerometers and gyroscopes. The inertial sensors are attached to the femur and tibia segments of the leg and are capable of measuring the acceleration and angular in all 3 axes simultaneously. The angular velocity data was used to calculate the rotation angle around the CoR and the centrifugal acceleration was used to calculate the distance from the inertial sensor to the CoR. Experiments were carried out in two stages: preliminary pendulum experiment and measuring the flexion-extension motion of the human knee. In both experiments the accuracy of the sensor's distance to the CoR was evaluated. The preliminary pendulum experiment showed correlation coefficient (CC) of over 0.99 whereas the human flexion-extension motion showed lower CC and the average absolute error was about 5.1 cm. Improvements such as a countermeasure for attachment errors/skin motion and consideration for other rotational motions such as internal-external rotation and varus-valgus rotation should be considered to further increase the accuracy of the proposed method.
• 112 Bending Toughness of Silicon used for Solar Cells

  FUKIYA Takafumi, SASAKI Katsuhiko, KURODA Akiyoshi, TAKEDA Ryo  北海道支部講演会講演概要集  2013-  (52)  23  -24  2013/09/28
• 316 Implementing a Flexion Extension Motion on the Knee Joint using a Robot Manipulator

  TAKEDA Ryo, Ferdinando RODRIGUEZ Y BAENA, Andrew AMIS  北海道支部講演会講演概要集  2013-  (52)  89  -90  2013/09/28
• 111 Thermal deformation analysis of CF-A1 composite under temperature change considering the inner structure

  YAMAMOTO Ken, SASAKI Katsuhiko, KURODA Akiyoshi, TAKEDA Ryo, KATAGIRI Kazuaki  The Proceedings of Conference of Hokkaido Branch  2013-  (52)  21  -22  2013/09/28
• J164012 A Method for Measuring Knee Joint Motion Using Multifunctional Sensors

  OKUZUMI Keisuke, LIU Xin, TAKEDA Ryo, SASAKI Katsuhiko  Mechanical Engineering Congress, Japan  2013-  "J164012  -1"-"J164012-5"  2013/09/08  

  This paper presents a method of measuring knee joint motion for clinical diagnostic procedures. MRI or optical tracking methods are examples of existing methods to quantify diagnostic procedures for assessing knee joint ligament injury. However, these methods require a large amount of space and are quite expensive. An alternative method is to use multifunctional sensors which contain tri-axial accelerometers and gyroscopes. Accelerometers can measure the tilt angle against the gravity vector and estimate the translational acceleration. Gyroscopes can measure the angle of rotary motion. An angle obtained by a gyroscope is normally influenced by noise; causing a bias in angle. This work presents a system using a Kalman filter to remove the bias angle obtained by the gyroscope. Experiments that measure three rotary motions and a translational motion of the knee joint were conducted. Sensors are mounted on the Tibia and Femur bone of a knee joint model. It was found that the bias of the gyroscope's output was minimized in all three rotary motions by applying the proposed system. In addition, translational distance was calculated by integrating the accelerometer's output. However, distance obtained by acceleration is significantly influenced by noises due to double integration. A method to process the acceleration data and obtain translational distance is also proposed.
• B209 Biomechanical Stability Tests on Knee Cruciate Ligaments using 6 DoF Manipulator Robot

  Takeda Ryo, Kawaguchi Yasuyuki, Rodriguez y Baena Ferdinando, Amis Andrew  Proceedings of the ... JSME Conference on Frontiers in Bioengineering  2012-  (23)  143  -144  2012/10/04
• 携帯型センサーシステムによる3次元歩行解析手法の開発

  武田量, 但野茂, 東藤正浩, 吉成哲  生体医工学  47-  (3)  323  -324  2009/06/10  [Not refereed][Not invited]
  
• 630 Gait Analysis of the Lower Limbs using Acceleration and Angular Velocity of the Thigh and Shank

  TAKEDA Ryo, TADANO Shigeru, TODOH Masahiro, NATORIGAWA Akiko, YOSHINARI Satoshi  バイオエンジニアリング講演会講演論文集  2008-  (21)  473  -474  2009/01/22  [Not refereed][Not invited]
  
• 305 3-D Gait Analysis Considering Abdominal Rotation

  MIYAGAWA Hiroaki, TAKEDA Ryo, YOSHINARI Satoshi, TADANO Shigeru  The Proceedings of Conference of Hokkaido Branch  2009-  (0)  77  -78  2009  [Not refereed][Not invited]
  
• B419 Gait analysis using the gravitational acceleration measured by wearable sensor system

  TAKEDA Ryo, TADANO Shigeru, TODOH Masahiro, YOSHINARI Satoshi  Proceedings of the ... JSME Conference on Frontiers in Bioengineering  2008-  (19)  167  -168  2008/09/22  [Not refereed][Not invited]
  
• 3636 Gait Analysis Using Acceleration and Gyro Sensors

  NATORIGAWA Akiko, TAKEDA Ryo, TODOH Masahiro, TADANO Shigeru, YOSHINARI Satoshi  The proceedings of the JSME annual meeting  2008-  (7)  213  -214  2008/08/02  [Not refereed][Not invited]
   

  This work proposes a method that can measure the three-dimensional positions of joint centers for hip, knee and ankle using wearable acceleration and gyro sensors. Healthy volunteers wore small sensor unit that included a tri-axis acceleration sensor and three single axis gyro sensors. Acceleration data from acceleration sensors and angular velocity data from gyro sensors to were used to estimate joint angles of the hip and knee. The joint angles along with the volunteers' body measurements were used to calculate positions of hip, knee and ankle joint. Flexion-extension angle and internal-e...
• A109 Gait Analysis Using Accelerometer and Gyrosensor

  TAKEDA Ryo, TADANO Shigeru, NAKAYASU Minoru, TODOH Masahiro, YOSHNARI Satoshi  Proceedings of the ... JSME Conference on Frontiers in Bioengineering  2006-  (17)  19  -20  2006/11/10  [Not refereed][Not invited]
  

Presentations

• The potential of utilizing opensource software for estimating hemodynamic parameters of the aorta  [Not invited]

  Ryo Takeda, Katsuhiko Sasaki, Shinya Honda, Hiroichi Yokoyama, Nobuyuki Oshima, Akiyoshi Kuroda, Hideyoshi Takashima, Chenyu Li, Hiroaki Date, Hiroyuki Kamiya

  the 16th World Congress on Computational Mechanics and 4th Pan American Congress on Computational Mechanics  2024/07
• Elmerによる胸部大動脈解離を対象とした流体-構造連成解析  [Not invited]

  北嶋 航太, 佐々木 克彦, 武田 量, 本田 真也, 横山 博一, 大島 伸行, 黒田 明慈, 髙嶋 英厳, 李 辰宇

  第35回計算力学講演会  2022/11
• Estimating the Load State of the Knee Joint Ligament in Complex Movements  [Not invited]

  Ikumi UNO, Ryo TAKEDA, Katsuhiko SASAKI, Shinya HONDA

  日本機械学会 第34回バイオエンジニアリング講演会  2022/06
• Development of an experimental platform for evaluating aortic numerical simulation  [Not invited]

  Kotaro FUNAMIZU, Ryo TAKEDA, Katsuhiko SASAKI, Shinya HONDA, Hiroichi YOKOYAMA, Nobuyuki OSHIMA, Akiyoshi KURODA, Hideyoshi TAKASHIMA, Chenyu LI

  日本機械学会 第34回バイオエンジニアリング講演会  2022/06
• 曲線状強化繊維を有する異形複合材の振動最適化  [Not invited]

  才脇武, 本田真也, 佐々木克彦, 武田量

  日本機械学会北海道支部第51回学生員卒業研究発表講演会  2022/03
• 大動脈疾患治療評価用の実験プラットフォームの開発  [Not invited]

  船水光太郎, 武田量, 佐々木克彦, 本田真也, 横山博一, 大島伸之, 黒田明慈, 高嶋英厳

  日本機械学会北海道支部第51回学生員卒業研究発表講演会  2022/03
• 加工状態推定のための有限要素法による孔空け加工シミュレーション  [Not invited]

  東野颯真, 本田真也, 佐々木克彦, 武田量, 鶴谷知洋, 戸羽篤也, 鈴木逸人, 植竹亮太

  日本機械学会北海道支部第51回学生員卒業研究発表講演会  2022/03
• ベイズ最適化を用いた有孔複合材平板の最適設計  [Not invited]

  北澤元気, 本田真也, 佐々木克彦, 武田量

  日本機械学会北海道支部第51回学生員卒業研究発表講演会  2022/03
• Estimating the Load State of the Knee Joint Ligaments using Finite Element Method  [Not invited]

  Ikumi UNO, Ryo TAKEDA, Katsuhiko SASAKI, Shinya HONDA

  日本機械学会北海道支部第51回学生員卒業研究発表講演会  2022/03
• Evaluating the Stability of the Knee joint through Finite Element Analysis and Ligament Strength  [Not invited]

  Ryo Takeda, Kodai Watanabe, Shinya Honda, Katsuhiko Sasaki

  HU-SNU Joint Symposium in the fields of Mechanical and Aerospace Engineering  2021/12
• 膝関節十字靭帯の支持力シミュレーション  [Not invited]

  渡邉 航大, 武田 量, 佐々木 克彦, 本田 真也

  2021年度塑性加工学会東北・北海道支部 若手研究発表会  2021/12
• AFP による製造を想定した複合材構造 の自己組織化マップを用いた多目的設計探査

  花谷 孔明, 本田 真也, 佐々木 克彦, 武田 量

  Dynamics and Design Conference 2021（D&D2021）  2021/09
• The effects of a constituent material optimized self-expanding stent on stenosis  [Not invited]

  武田 量, 嘉陽 侑人, 佐々木 克彦, 本田 真也

  日本機械学会 M&M2021材料力学カンファレンス  2021/09
• Splitting tensile simulation of particle reinforced composite  [Not invited]

  牧野 圭佑, 大山 航汰, 佐藤 亘, 本田 真也, 高橋 航圭, 佐々木 克彦, 武田 量

  日本機械学会 2021年度 年次大会  2021/09
• Stent Geometry Optimization for In-stent Restenosis Prevention through Fluid-Structure Interaction Analysis  [Not invited]

  Varien Janitra Nuralif Susanto, Katsuhiko Sasaki, Shinya Honda, Ryo Takeda

  The 5th International Conferences on Mechanical Engineering  2021/08
• Investigating the Aortic Dissection Hemodynamic Parameters using Numerical Simulation  [Invited]

  Ryo Takeda

  The 5th International Conferences on Mechanical Engineering  2021/08
• Development of knee joint cruciate ligament simulator considering geometry and material properties  [Not invited]

  宮武 綾香, 武田 量, 佐々木 克彦, 本田 真也

  日本機械学会北海道支部第50回学生員卒業研究発表講演会  2021/03
• Stanford A 型大動脈解離の流体構造連成解析  [Not invited]

  佐藤 史弥, 陳 俊男, 武田 量, 本田 真也, 佐々木 克彦, 大島 伸行, 横山 博一, 黒田 明慈, 高嶋 英厳, 李 辰宇

  日本機械学会 2020年度年次大会  2020/09
• 膝関節十字靭帯の形状及び力学特性を考慮した有限要素モデ ルの開発  [Not invited]

  渡邉 航大, 武田 量, 佐々木 克彦, 本田 真也

  日本機械学会 2020年度年次大会  2020/09
• 内側側副靭帯の長さ変化を考慮した膝関節シミュレーション モデルの開発  [Not invited]

  武田 量, 篠原 駿, 佐々木 克彦, 本田 真也

  日本機械学会 2020年度年次大会  2020/09
• オープンソースソフトウェアーを用いた大動脈解離の流体構造連成解析  [Not invited]

  陳 俊男, 佐々木 克彦, 本田 真也, 武田 量, 大島 伸行, 黒田 明慈, 横山 博一, 李 辰宇, 高嶋 英厳

  日本機械学会 第 32 回計算力学講演会(CMD2019)  2019/09 

  講演番号118
• 膝関節屈曲角度による膝内側靭帯組織長の変化  [Not invited]

  篠原 駿, 佐々木 克彦, 本田 真也, 武田 量

  日本機械学会年次大会2019  2019/09 

  講演番号J04223P13
• 自己拡張ステントの構成材料と変形特性の関係  [Not invited]

  嘉陽 侑人, 佐々木 克彦, 本田 真也, 武田 量

  日本機械学会年次大会2019  2019/09 

  講演番号J02315
• 粒子群最適化による非弾性構成モデルの材料パラメータ評価  [Not invited]

  水沼 千尋, 佐々木 克彦, 本田 真也, 武田 量

  日本機械学会年次大会2019  2019/09 

  講演番号J04231P11
• 大動脈解離タイプを考慮した CFD による血流シミュレーション  [Not invited]

  佐藤 史弥, 武田 量, 佐々木 克彦, 大島 伸行, 横山 博一, 本田 真也

  日本機械学会年次大会2019  2019/09 

  講演番号J02701
• 成形時の反り最小化を目的とした積層複合材パッドアップ部の最適設計  [Not invited]

  樋口 哲也, 本田 真也, 佐々木 克彦, 武田 量

  日本機械学会年次大会2019  2019/09 

  講演番号J04218P09
• RBF ネットワークによる繊維強化複合材の逐次近似最適化  [Not invited]

  中谷 翔太, 本田 真也, 佐々木 克彦, 武田 量

  日本機械学会年次大会2019  2019/09 

  講演番号J04218P08
• 電着樹脂含浸法を用いて作製した炭素繊 維複合材の振動特性  [Not invited]

  橋本 直暉, 本田 真也, 片桐 一彰, 佐々木 克彦, 武田 量

  日本機械学会 D&D2019  2019/08 

  講演番号103
• CFRP により軽量化された農薬散布ブ ームスプレーヤの振動特性  [Not invited]

  玉木 覚, 本田 真也, 星野 洋平, 佐々木 克彦, 武田 量

  日本機械学会 D&D2019  2019/08 

  講演番号102
• Length Change Patterns of the Medial Ligaments of the Knee  [Not invited]

  Shun Shinohara, Lukas Willinger, Kiron Athwal, Andy Williams, Andrew Amis

  ISB/ASB 2019  2019/07 

  Presentation 3-1101
• Development of Knee Joint Finite Element Analysis Model considering Ligament Geometry and Material Properties  [Not invited]

  Ryo Takeda, Makoto Genma, Katsuhiko Sasaki

  ISB/ASB 2019  2019/07 

  Presentation 3-1114
• Sequential Approximate Optimization for Fibrous Composites by using RBF Network  [Not invited]

  Shota Nakaya, Shinya Honda, Katsuhiko Sasaki, Ryo Takeda

  The 9th East Asia Mechanical and Aerospace Engineering Workshop  2019/06
• Variable-Stiffness Composite manufactured by using Electro-Activated Deposition Resin Molding Method  [Not invited]

  Naoki Hashimoto, Shinya Honda, Kazuaki Katagiri, Katsuhiko Sasaki, Ryo Takeda, Shimpei Yamaguchi, Sonomi Kawakita

  The 9th East Asia Mechanical and Aerospace Engineering Workshop  2019/06
• 熱間プレスによる任意形状繊維を有する熱可塑性複合材シェルの作製  [Not invited]

  橋本健吾, 本田真也, 佐々木克彦, 武田量

  日本材料学会第68期学術講演会  2019/05 

  講演番号115
• トポロジー最適化により設計されたバルーン拡張ステ ントの変形特性評価  [Not invited]

  小関美季, 佐々木克彦, 本田真也, 武田量

  日本材料学会第68期学術講演会  2019/05 

  講演番号111
• Investigating the effects of aortic dissection through 3D CT image segmentation and CFD  [Not invited]

  Ryo Takeda, Kodai Kijima, Hiroichi Yokoyama, Katsuhiko Sasaki, Nobuyuki Oshima, Akiyoshi Kuroda

  The 8th East Asia Mechanical and Aerospace Engineering Workshop  2018/12 

  pp74
• Development of a method to evaluate the effects of aortic dissection through CFD and CT image geometry extraction  [Not invited]

  Ryo Takeda, Kodai Kijima, Hiroichi Yokoyama, Katsuhiko Sasaki, Nobuyuki Oshima, Akiyoshi Kuroda

  8th World Congress of Biomechanics  2018/07 

  P3586
• Development of a knee joint structural analysis method considering joint geometry and ligament bundles loads  [Not invited]

  Ryo Takeda, Makoto Genma, Katsuhiko Sasaki

  8th World Congress of Biomechanics  2018/07 

  P1671
• Plastic Mechanics Aspects of Knee Joint Ligament Bundle Damage Risk  [Not invited]

  Ryo Takeda, Shun Shinohara, Makoto Genma, Katsuhiko Sasaki

  2018 JSTP Spring Conference  2018/06 

  講演論文集 pp41-42
• 流体解析による大動脈解離後の血流評価および壁面せん断応力の推定  [Not invited]

  木島雄大, 武田量, 横山博一, 黒田明慈, 大島伸行, 佐々木克彦

  日本機械学会 第28回バイオフロンティア講演会  2017/10 

  バイオフロンティア講演会講演論文集 2B24
• ステント留置を考慮した冠動脈の流れ・変形連成解析  [Not invited]

  佐々木智義, 武田量, 黒田明慈, 佐々木克彦

  日本機械学会 第28回バイオフロンティア講演会  2017/10 

  バイオフロンティア講演会講演論文集 2B32
• 靭帯繊維束の支持力を考慮した膝関節構造解析手法の開発  [Not invited]

  弦間慎, 武田量, 佐々木克彦

  日本機械学会北海道支部 第55回講演会  2017/09 

  北海道支部講演会講演概要集 pp1
• Joint Trajectories ㏌ the Transverse Plane During Gait using H-GAIT System  [Not invited]

  Laura Gastaldi, Valentina Agostini, Valeria Rosso, Ryo Takeda, Shigeru Tadano

  The 26th Congress of the International Society of Biomechanics  2017/07 

  Abstract Book P082
• Comparison of the Load Contribution of the Knee Joint Ligament Bundles: Computational Modelling vs Desmotomy  [Not invited]

  Ryo Takeda, Lu Yu, Makoto Genma, Katsuhiko Sasaki

  The 26th Congress of the International Society of Biomechanics  2017/07 

  Abstact Book P290
• Simultaneous wireless measurement of lower limb muscle activities and gait kinematics using EMG telemeter with H-Gait system  [Not invited]

  Ryo Takeda, Yoshihiro Seki, Masahiro Todoh, Masahide Harada, Harukazu Tohyama, Shigeru Tadano

  The 26th Congress of the International Society of Biomechanics  2017/07 

  Abstact Book P321
• Gait measurements in the transverse plane using a wearable system: An experimental study of test-retest reliability  [Not invited]

  Valeria Rosso, Laura Gastaldi, Valentina Agostini, Ryo Takeda, Shigeru Tadano

  2017 IEEE International Instrumentation and Measurement Technology Conference  2017/05
• Effect of Stent Mesh Structure on its Flexibility, Trackability and Conformability  [Not invited]

  Achmad Syaifudin, Ryo Takeda, Katsuhiko Sasaki

  The 16th International Conference on Biomedical Engineering  2016/12
• Lower leg muscle activity during gait cycle phases using H-Gait system with EMG telemeter  [Not invited]

  Yoshihiro Seki, Ryo Takeda, Masahide Harada, Harukazu Tohyama, Shigeru Tadano

  The 16th International Conference on Biomedical Engineering  2016/12
• プラーク特性を考慮した自己拡張ステントの変形解析  [Not invited]

  境野達也, 佐々木克彦, 黒田明慈, 武田量

  日本機械学会 第27回バイオフロンティア講演会  2016/10
• H-GAITとEMGテレメータを用いた歩行中の下肢筋活動  [Not invited]

  関善裕, 武田量, 原田証英, 遠山晴一, 東藤正浩, 但野茂

  日本機械学会 第27回バイオフロンティア講演会  2016/10
• 膝関節靭帯切離術による線維束支持力測定  [Not invited]

  武田量, 于路, Palomino Alberto, 佐々木克彦

  日本機械学会 第27回バイオフロンティア講演会  2016/10
• The Load Contributions of the Double Bundles Within the ACL and PCL using DOF Release Fixture  [Not invited]

  Ryo Takeda, Keisuke Okuzumi, Katsuhiko Sasaki

  22nd Conference of the European Society of Biomechanics  2016/07
• Gait Analysis of OA Patients using Wearable Gait Sensors (H-GAIT SYSTEM)  [Not invited]

  Ryo Takeda

  22nd Conference of the European Society of Biomechanics  2016/07
• Cutting Studyと筋骨格膝シミュレータによる膝関節靭帯束支持力の推定  [Not invited]

  武田 量, 于路, 佐々木克彦

  日本材料学会 第65期学術講演会  2016/05
• Estimation of the CoM and CoP using a 3D Body Scanning Systems  [Not invited]

  Daniele Borzelli, Laura Gastaldi, Stefano Pastorellli, Alberto Botter, Taian Vieira, Junpei Takagi, Ryo Takeda, Shigeru Tadano

  2016 IEEE International Symposium on Medical Measurements and Applications  2016/05
• Technical Challenges using Magneto-inertial Sensors for Gait Analysis  [Not invited]

  Laura Gastaldi, Valentina Agostini, Valentina Gabola, Maria Macarena Lovagnini Frutos, Valeria Rosso, Ryo Takeda, Marco Knaflitz, Shigeru Tadano

  2016 IEEE International Symposium on Medical Measurements and Applications  2016/05
• The Measurements of the Anterior Cruciate Ligament Bundles on the Knee Joint Load  [Not invited]

  Yuki Hirano, Ryo Takeda, Katsuhiko Sasaki

  28th Bioengineering Conference  2016/01
• Measuring the load distribution of ACL bundle fibers using a robot system  [Invited]

  Ryo Takeda

  The 42nd. Annual Meeting of the Japanese Society for Clinical Biomechanics  2015/11
• The Effect of PCL Bundles on Knee Joint Stability  [Not invited]

  Ryo Takeda, Keisuke Okuzumi, Katsuhiko Sasaki

  26th Conference on Frontiers in Bioengineering  2015/10
• A Novel Drift Removal Method for Gait Analysis Using Wearable Sensor Systems  [Not invited]

  Ryo Takeda, Giulia Lisco, Tadashi Fujisawa, Laura Gastaldi, Stefano Pastorelli, Harukazu Tohyama, Shigeru Tadano

  The 8th Asian-Pacific Conference on Biomechanics  2015/09
• Investigations of the Load Contributions of the PM and the AL Bundles of the PCL  [Not invited]

  Ryo Takeda, Keisuke Okuzumi, Yasuyuki Kawaguchi, Katsuhiko Sasaki

  The 8th Asian-Pacific Conference on Biomechanics  2015/09
• Evaluation of a Method for Identifying Knee Joint CoR Using IMUs  [Not invited]

  Lu Yu, Keisuke Okuzumi, Ryo Takeda, Katsuhiko Sasaki

  The 8th Asian-Pacific Conference on Biomechanics  2015/09
• Mechanical Influence of Advanced Shape-Memory Alloy Stents during Deployment  [Not invited]

  Yukiko Tomooka, Katsuhiko Sasaki, Ryo Takeda

  The 8th Asian-Pacific Conference on Biomechanics  2015/09
• Development of Asymmetric Stent for Treatment of Eccentric Plaque  [Not invited]

  Achmad Syaifudin, Katsuhiko Sasaki, Ryo Takeda

  The 8th Asian-Pacific Conference on Biomechanics  2015/09
• Investigation of the Load Contributions of the Anterior Cruciate Ligament Bundles against Degree of Freedom Release  [Not invited]

  Ryo Takeda, Keisuke Okuzumi, Katsuhiko Sasaki

  The 25th Congress of the International Society of Biomechanics 2015  2015/07
• Gait Analysis of TKA Patients at 2 Weeks and 4 Weeks after Surgery using Wearable Sensors  [Not invited]

  Ryo Takeda, Tadashi Fujisawa, Giulia Lisco, Laura Gastaldi, Stefano Pastorelli, Harukazu Tohyama, Shigeru Tadano

  The 25th Congress of the International Society of Biomechanics 2015  2015/07
• Is the load carried from the ACL mid-substance fibers during anterior tibial translation transmitted to the posterior fan-like extension fibers on the femoral attachment?  [Not invited]

  Yasuyuki Kawaguchi, Kazunori Yasuda, Eiji Kondo, Ryo Takeda, Camilla Halewood, Keiichi Akita, Andrew A Amis

  ISAKOS Congress 2015  2015/06
• The Effects of Anterior Cruciate Ligament Bundles on Knee Joint Stability  [Not invited]

  Ryo Takeda, Keisuke Okuzumi, Katsuhiko Sasaki

  64th JSMS Academic Meeting  2015/05
• The Most Important Fibers In The Femoral Attachment Of The Anterior Cruciate Ligament For Resisting Tibial Displacements  [Not invited]

  Yasuyuki Kawaguchi, Eiji Kondo, Ryo Takeda, Camilla Halewood, Keiichi Akita, Kazunori Yasuda, Andrew A Amis

  ORS 2015 Annual Meeting  2015/03
• The Effect of Different Ligament Reconstruction on Knee Joint Range of Movement and Load  [Not invited]

  Keisuke Okuzumi, Ryo Takeda, Yu Lu, Katsuhiko Sasaki

  25th Conference on Frontiers in Bioengineering  2014/10
• ロボットマニピュレーターを用いた膝関節屈曲伸展動作の再現  [Not invited]

  武田 量, Ferdinando Rodriguez y Baena, Andrew Amis

  日本機械学会北海道支部 第52回講演会  2014/09
• Knee Joint Center of Rotation Estimation using Inertial Sensor  [Not invited]

  Ryo Takeda, Lu Yu, Keisuke Okuzumi, Katsuhiko Sasaki

  Mechanical Engineering Congress, 2014 Japan  2014/09
• Gait parameter changes of TKA patients in both legs at 2 and 4 weeks after surgery  [Not invited]

  Tadashi Fujisawa, Ryo Takeda, Katsuhiro Tanaka, Giulia Lisco, Laura Gastaldi, Stefano Pastorelli, Jiazhi Guo, Harukazu Tohyama, Shigeru Tadano

  7th World Congress on Biomechanics  2014/07
• Drift removal of gyro sensor for accurately measuring human gait from acceleration and angular velocity data  [Not invited]

  Ryo Takeda, Giulia Lisco, Tadashi Fujisawa, Harukazu Tohyama, Shigeru Tadano, Laura Gastaldi, Stefano Pastorelli

  7th World Congress on Biomechanics  2014/07
• Development of a novel method to detect the pivot shift within the knee using angular velocity and acceleration measurements  [Not invited]

  Keisuke Okuzumi, Ryo Takeda, Katsuhiko Sasaki

  7th World Congress on Biomechanics  2014/07
• The most important load-bearing fibers in the femoral attachment of the anterior cruciate ligament for resisting tibial anterior drawer force and internal-external rotation torque  [Not invited]

  Yasuyuki Kawaguchi, Eiji Kondo, Ryo Takeda, Camilla Halewood, Keichi Akita, Kazunori Yasuda, Andrew Amis

  16th ESSKA Congress  2014/05
• Development of a Robotic Testing Platform for Investigating Knee Joint Ligament Force Contributions during Various Flexion Extension Angles  [Not invited]

  Ryo Takeda, Ferdinando Rodriguez y Baena, Andrew Amis

  The 15th International Conference on Biomedical Engineering, Abstacts  2013/12
• Deformation analysis of balloon expanded stent during and after its expansion considering viscoplasticity and vessel pulsation  [Not invited]

  Achmad Syaifudin, Katsuhiko Sasaki, Ryo Takeda

  The 15th International Conference on Biomedical Engineering, Abstacts  2013/12
• Flexion-extension Knee Joint Motion Implementation Using a 6 Axis Robotic Manipulator Platform  [Not invited]

  Ryo Takeda, Ferdinando Rodriguez y Baena, Andrew Amis

  The International Symposium on Interdisciplinary Research and Education on Medical Device Developments  2013/09
• 多機能センサによる膝関節運動の測定方法  [Not invited]

  奥住 啓介, 劉 鑫, 武田 量, 佐々木 克彦

  日本機械学会 2013年度年次大会 講演論文集  2013/09
• ロボットマニピュレーターを用いた膝関節屈曲伸展動作の再現  [Not invited]

  武田 量, Ferdinando Rodriguez y Baena, Andrew Amis

  日本機械学会北海道支部 第52回講演会 講演概要集  2013/09
• Implementing an Anterior Posterior Drawer Motion on a Knee Joint using a 6 DoF Manipulator Robot and a 6 Axis Force/Torque Sensor  [Not invited]

  Ryo Takeda, Ferdinando Rodriguez y Baena, Andrew Amis

  Proceedings of the 7th Asian Pacific Conference on Biomechanics  2013/08
• 6自由度ロボットマニピュレーターを用いた膝十字靭帯の安定性試験  [Not invited]

  Ryo Takeda, Yasuyuki Kawaguchi, Ferdinando Rodriguez y Baena, Andrew Amis

  23rd Conference on Frontiers in Bioengineering  2012/10
• 加速度・角速度センサによる三次元歩行解析  [Not invited]

  宮川寛亮, 武田量, 但野茂

  日本機械学会年次大会講演論文集  2010/09
• 体幹部回旋運動を考慮した三次元歩行解析  [Not invited]

  宮川寛亮, 武田量, 吉成哲, 但野茂

  日本機械学会北海道支部講演会講演概要集  2009/11
• 携帯型センサーシステムによる3次元歩行解析手法の開発  [Not invited]

  武田量, 但野茂, 東藤正浩, 吉成哲

  生体医工学  2009/06
• 大腿部と下腿部の加速度・角速度を利用した歩行解析  [Not invited]

  武田量, 但野茂, 東藤正浩, 名取川愛紀子, 吉成哲

  21st Bioengineering Conference  2009/01
• 携帯型センサーシステムによる重力加速度を用いた歩行解析  [Not invited]

  武田量, 但野茂, 東藤正浩, 吉成哲

  日本機械学会バイオフロンティア講演会講演論文集  2008/09
• Gait Analysis Using Acceleration and Gyro Sensors  [Not invited]

  NATORIGAWA AKIKO, TAKEDA RYO, TODO MASAHIRO, TADANO SHIGERU, YOSHINARI SATOSHI

  日本機械学会年次大会講演論文集  2008/08
• GAIT ANALYSIS USING WIRELESS ACCELERATION SENSORS AND GYRO SENSORS(1B3 Orthopaedic & Rehabilitation Biomechanics III)  [Not invited]

  Takeda Ryo, Tadano Shigeru, Todoh Masahiro, Yoshinari Satoshi

  Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics  2007/11
• 加速度センサーと角速度センサーを用いた歩行解析  [Not invited]

  武田量, 但野茂, 中安稔, 東藤正浩, 吉成哲

  日本機械学会バイオフロンティア講演会講演論文集  2006/11

Association Memberships

• European Society of Biomechanics   International Society of Biomechanics   THE SOCIETY OF MATERIALS SCIENCE, JAPAN   THE JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY   THE JAPAN SOCIETY OF MECHANICAL ENGINEERS   

Research Projects

• Evaluation of Aortic Dissections and Treatment Methods using Numerical Simulation

  Research Organization for Information Science and Technology：FY 2022 Joint Usage/Research Center for Interdisciplinary Large-scale Information Infrastructures (JHPCN)

  Date (from‐to) : 2022/04 -2023/03 

  Author : 武田量, 佐々木克彦, 大島伸行, 横山博一, 黒田明慈, 柴田良一, 高橋裕介, 髙嶋英厳, 李辰宇
• Evaluating the Effectiveness of Stent Graft Treatment for Aortic Dissection using Fluid-Structure Interaction

  Research Organization for Information Science and Technology：FY 2021 Joint Usage/Research Center for Interdisciplinary Large-scale Information Infrastructures (JHPCN)

  Date (from‐to) : 2021/04 -2022/03 

  Author : 武田量, 佐々木克彦, 大島伸行, 横山博一, 黒田明慈, 柴田良一, 高橋裕介, 髙嶋英厳, 李辰宇
• Development of knee joint stability evaluation method considering joint synovial fluid

  Japan Society for the Promotion of Science：Grant-in-Aid for Scientific Research (C)

  Date (from‐to) : 2019/04 -2022/03 

  Author : Ryo Takeda
• Development of Fluid-Structure Interaction Analysis for Aortic Dissection Risk Assessment

  Research Organization for Information Science and Technology：FY 2020 Joint Usage/Research Center for Interdisciplinary Large-scale Information Infrastructures (JHPCN)

  Date (from‐to) : 2020/04 -2021/03 

  Author : Ryo Takeda, Katsuhiko Sasaki, Nobuyuki Oshima, Masaharu Munetomo, Takeshi Iwashita, Hirokazu Yokoyama, Akiyoshi Kuroda, Ryoichi Shibata, Yusuke Takahashi
• Development of knee joint ligament rupture simulator based on load and geometrical conditions

  Japan Society for the Promotion of Science：Grant-in-Aid for Young Scientists (B)

  Date (from‐to) : 2017/04 -2019/03 

  Author : Ryo Takeda

   

  The knee ligament rupture mechanism based on the mechanical load condition and the geometry was analyzed. First, a knee joint ligament experimetal setup consisting of a universal material testing machine, a knee joint fixation jig, and a thermo‐hygrostat chamber was created. Porcine stifle joint was used as a substitute knee joint. The knee model was set in the knee joint fixation jig, and the load was measured via a force sensor located between the material testing mechine and the joint fixation jig.The material testing machine applied a cyclic displacement to the knee model until the ligament was damaged.Then the mechanical property values,such as the load,required for ligament damage was determined. Furthermore, the ligament geometry was extracted from MRI by an image segmentation process. Based on the obtained mechanical properties and geometry of the ligaments, a finite element analysis model capable of reproducing knee joint ligament loads was constructed.
• Interpreting the knee joint ligament reconstruction rupture mechanism from a mechanical dynamics point of view

  The Mazda Foundation：Mazda Research Grant

  Date (from‐to) : 2016 -2018 

  Author : Ryo Takeda
• Departure from the Asian waterway vulnerability based on the correlation between watershed environments and hydrological information

  The Sumitomo Foundation：Grant for Environmental Research Projects

  Date (from‐to) : 2015/11 -2017/10 

  Author : Shunitz Tanaka, a, o, a, Ryo Taked
• Development of Knee Joint Ligament Fibre Reconstruction Simulator

  NOASTEC：Sapporo Life Sciences Industry Project

  Date (from‐to) : 2016/08 -2017/03 

  Author : Ryo Takeda
• Evaluation of Artificial Ligament Rupture Risk for Knee Ligament Reconstruction as seen from a Plastic Mechanics Point of View

  The Japan Society for Technology of Plasticity：Young Researchers Research Grant

  Date (from‐to) : 2015/04 -2017/03 

  Author : Ryo Takeda
• Development of a Knee Joint Ligament Reconstruction Evaluation Platform

  Japan Society for the Promotion of Science：Grant-in-Aid for Young Scientists B

  Date (from‐to) : 2014/04 -2016/03 

  Author : Ryo Takeda