研究者詳細 - 髙嶋　一登

論文 - 髙嶋　一登

分割表示96 件中 21 - 40 件目／全件表示 >>

Fabrication, characterization and modelling of the fabric electrode-based highly stretchable capacitive strain sensor 査読有り国際誌

Singh N.K., Takashima K., Pandey S.S.

Materials Today Communications 32 104095 (10pp) 2022年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

Highly stretchable and capacitance-based strain sensors were fabricated utilizing highly stretchable silicone elastomer as dielectric film sandwiched between the conducting and stretchable cloth-based top and bottom electrodes. Electromechanical characterizations for the proposed sensor after multiple and reversible loading and unloading cycles up to 150% applied strain were conducted followed by the modelling of the sensing performance. It has been shown that the sensor exhibits reproducible electromechanical performance under multiple reversible stretching and relaxation cycles. There was a very small deviation (< 10%) in the observed values of the capacitance upon the applied strain of 150% up to the 1000 loading and unloading cycles. Tensile measurement for the sensor under various applied strains, not only exhibits almost constant force indicating negligible Mullins effect and negligible time-dependent changes at a fixed strain up to 100% suggesting that viscoelastic losses can also be neglected. From uniaxial tensile experiments, constitutive model of the dielectric elastomer sensor was validated. For the fitting of the experimental data obtained from the uniaxial tensile measurement, a variety of strain energy formulations have been compared for predicting the constitutive behaviour of sensor using the Mooney– Rivlin, Neo-Hookean, Yeoh and Ogden models, where 2nd term of the Ogden model was found to explain the experimental tensile data most accurately. To explain some observed losses at 150% of applied strain, the Prony series-based time dependent model was used for predicting stress at any value of time and it was found that experimental data was well fit with 4th order of Prony series.

DOI： 10.1016/j.mtcomm.2022.104095

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85135119451&origin=inward

Variable-stiffness and deformable link using shape-memory material and jamming transition phenomenon 査読有り国際誌

K. Takashima, T. Imazawa, H. Cho

Journal of Robotics and Mechatronics ( 富士技術出版株式会社 ) 34 ( 2 ) 466 - 477 2022年04月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this study, we developed a variable-stiffness and deformable link using shape-memory material and the jamming transition phenomenon. Above its glass transition temperature (Tg), a shape-memory polymer (SMP) can be deformed by applying a small load. SMPs maintain the deformed shape after they have been cooled below Tg, and they return to their original shape when heated above Tg. The reversible change in the elastic modulus between the glassy and rubbery states of SMPs can be on the order of 100–1000 times. We exploited the characteristics of SMPs to develop robot components with variable stiffness and sensitiv-ity. The jamming transition phenomenon for granular material has been widely used as a method to change the stiffness of robots. This phenomenon is the change from fluid-like to solid-like conditions by removing air from a space containing particles. In this study, we developed a variable-stiffness link by combining the SMP and the jamming transition phenomenon. More-over, by replacing the SMP with shape-memory alloys (SMAs), whose recovery force and elastic modulus are larger than those of SMPs, we prepared a sec-ond prototype with variable stiffness. We evaluated the performance of both prototypes, using the SMP or the SMA, with experiments and confirmed the motion principle of the proposed link (e.g., shape recovery and shape fixity). Moreover, it was confirmed that the stiffness of these links can be changed among four states.

DOI： 10.20965/jrm.2022.p0466

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85129076163&origin=inward

Multipoint detection of structural deformation of pulsating 3D heart model using flexible organic piezoelectric-sensor array 査読有り国際誌

Y. Nagayama, Y. Kondo, Y. Koshiba, S. Horike, K. Takashima, K. Ishida

Japanese Journal of Applied Physics 61 ( SE ) SE1014 (11pp) 2022年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

Multipoint detection of the structural deformation of a pulsating 3D heart model was conducted using a flexible piezoelectric sensor array with a poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] thin film sealed with biocompatible parylene C. The piezoelectric signals detected from the sensor array attached to the 3D heart model were correlated with an electrocardiogram signal. These piezoelectric signals can be converted into the compressive stress applied to the flexible sensors by the pulsating motion of the 3D heart model. The experimental results mean that the contraction force, generated by the heart muscle (i.e., myocardium), can be directly evaluated. The different output voltages depending on the location were obtained from each sensor, indicating the possibility of a real-time detection of the irregular motion of the heart and the early detection of ischemic heart disease, which leads to the loss of local contractile force in myocardial tissue.

DOI： 10.35848/1347-4065/ac5a04

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85128841944&origin=inward

Tear strength estimation of electroactive polymer-based strain sensors 査読有り国際誌

Singh N.K., Takashima K., Pandey S.S.

Proceedings of SPIE - The International Society for Optical Engineering 12042 2022年04月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Electroactive polymer-based sensors are subjected to repeated loading and unloading cycles under variable applied strains and estimation of the tear strength plays a critical role in determining durability. A trouser type of specimen made from conducting and stretchable freestanding films consisting of SEBS rubber and dodecyl benzenesulfonic acid (DBSA) doped polyaniline composite was used for fabricating the capacitive strain sensor and tear strength estimation. Strain energy density for the composite film was calculated from the tear test data aiming towards the prediction of the life of the specimen. Our results revealed a very high value (150 newton/mm) of tear strength, leading to the sustainability of the film up to millions of cycles.

DOI： 10.1117/12.2627807

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85132009825&origin=inward

Evaluation of effect of aneurysm model material on coil contact force and catheter movement 査読有り国際誌

OISHI Takuya, TAKASHIMA Kazuto, YOSHINAKA Kiyoshi, YU Kaihong, OHTA Makoto, MORI Koji, TOMA Naoki

Journal of Biomechanical Science and Engineering ( 一般社団法人日本機械学会 ) 17 ( 1 ) 1 - 10 Article ID: 21-00261 (10pp) 2022年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

To ensure safe coil embolization for cerebral aneurysms, it is important to investigate the contact force between a coil and an aneurysm wall. Therefore, in our previous study, we developed an experimental system for measuring the contact force between a coil and an aneurysm biomodel. However, because the aneurysm model was made of silicone rubber, its physical properties, such as the friction coefficient, differed from those of aneurysms #Iin vivo#IR. Therefore, in this study, we made an aneurysm model using poly (vinyl alcohol) hydrogel (PVA-H) and evaluated the effect of the model material on the contact force. In addition, we acquired images during the experiment and evaluated the behavior of the coil and catheter and the relationship between the catheter movement and the contact force. A commercially available coil was inserted through a catheter into two types of aneurysm models (silicone rubber and PVA-H), and the effects of the model material and the catheter tip position (near dome, at the center, and near neck) were evaluated. The contact force and the total movement of the catheter tip for the PVA-H model were smaller than those for the silicone rubber model. The contact force (total catheter movement) was greater (smaller) when the catheter tip was inserted deeper into the silicone rubber model. These results suggest that the state of contact between the aneurysm and the coil affects the contact force and the catheter movement and that these two values are related.

DOI： 10.1299/jbse.21-00261

Scopus

CiNii Article

CiNii Research

その他リンク： https://ci.nii.ac.jp/naid/130008085995

Characterization of variable-sensitivity force sensor using stiffness change of shape-memory polymer based on temperature 査読有り国際誌

K. Takashima, J. Kobuchi, N. Kamamichi, K. Takagi, T. Mukai

ROBOMECH Journal 8 ( 1 ) Article:24 (15pp) 2021年11月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In the present study, we propose a variable-sensitivity force sensor using a shape-memory polymer (SMP), the stiffness of which varies according to the temperature. Since the measurement range and sensitivity can be changed, it is not necessary to replace the force sensor to match the measurement target. Shape-memory polymers are often described as two-phase structures comprising a lower-temperature “glassy” hard phase and a higher-temperature “rubbery” soft phase. The relationship between the applied force and the deformation of the SMP changes depending on the temperature. The proposed sensor consists of strain gauges bonded to an SMP bending beam and senses the applied force by measuring the strain. Therefore, the force measurement range and the sensitivity can be changed according to the temperature. In our previous study, we found that a sensor with one strain gauge and a steel plate had a small error and a large sensitivity range. Therefore, in the present study, we miniaturize this type of sensor. Moreover, in order to describe the viscoelastic behavior more accurately, we propose a transfer function using a generalized Maxwell model. We verify the proposed model experimentally and estimated the parameters by system identification. In addition, we realize miniaturization of the sensor and achieve the same performance as in our previous study. It is shown that the proposed transfer function can capture the viscoelastic behavior of the proposed SMP sensor quite well.

DOI： 10.1186/s40648-021-00210-8

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85118929590&origin=inward

Relationship between contact force and catheter movement in aneurysm model 査読有り国際誌

T. Oishi, K. Takashima, K. Yoshinaka, K. Yu, M. Ohta, K. Mori, N. Toma

Eighteenth International Conference on Flow Dynamics (ICFD2021) 420 - 422 2021年10月

Parametric study of device insertion simulator for endovascular treatment 査読有り国際誌

H. Ota, K. Takashima, Y. Haga, M. Ohta, C. Dai, M. Shojima

Eighteenth International Conference on Flow Dynamics (ICFD2021) 417 - 419 2021年10月

Surface Shape Changeable Tactile Sensor Using Shape-Memory Polymer 査読有り国際誌

Takashima K., Miyazaki R., Mukai T.

2021 60th Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2021 1169 - 1174 2021年09月

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

Japan Tokyo 2021年09月08日 - 2021年09月10日

Tactile sensors typically have elastic covers for reducing the impact of objects that make contact with them. However, such covers decrease the spatial resolution of the sensor because of their low-pass spatial filtering characteristics, which vary based on the stiffness of the cover. Therefore, we propose a tactile sensor that uses a shape-memory polymer (SMP) with a stiffness that varies with temperature. SMPs can be deformed above their glass transition temperature (Tg) upon application of a small load, and they maintain their shape after they have been cooled below T g and become rigid. When subsequently heated above T g, they return to their initial shape. These characteristics can be exploited to alter the spatial resolution, the rigidity and the shape of the sensor surface by adjusting the temperature of the SMP. In this study, we changed the shape of the sensor surface by utilizing these shape-changing characteristics, and we evaluated the output of a prototype sensor. Utilizing the shape fixity of the SMP, various bumpy surfaces were realized. Through the experiments using the prototype sensor, the sensor was found to be effective at measuring surface profiles.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85117699561&origin=inward

Characteristics of pneumatic artificial rubber muscle using two shape-memory polymer sheets 査読有り国際誌

K. Takashima, D. Iwamoto, S. Oshiro, T. Noritsugu, T. Mukai

Journal of Robotics and Mechatronics 33 ( 3 ) 653 - 664 2021年06月

Fatigue life prediction of electroactive polymer strain sensor 査読有り国際誌

N. K. Singh, K. Takashima, S. Pandey

Proceedings of SPIE - The International Society for Optical Engineering 11587 2021年03月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Electroactive polymers strain sensors bear a great potentiality in the area of soft robotics, wearable devices, and fitness industries. A small initial defect present in such sensor may grow to a critical size during contraction and relaxation cycles leading to mechanical failure, therefore, prediction of fatigue life is inevitable. The crack growth approach is one of the amicable ways to estimate the fatigue life considering parameters like tear energy, crack geometry, and power law. In this work, crack growth approach based on power law is being proposed to predict fatigue life utilizing conducting and stretchable freestanding films consisted of SEBS rubber and dodecyl benzenesulfonic acid (DBSA) doped polyaniline composite. Utilizing this crack growth model for the prediction of fatigue life exhibited that such films can sustain more than a million cycles even at a large value of deformation.

DOI： 10.1117/12.2584521

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85109073962&origin=inward

Evaluation of Contact Force between Aneurysm Model and Coil for Embolization of Intracranial Aneurysms 査読有り国際誌

Takashima Kazuto, Ikeda Yuta, Yoshinaka Kiyoshi, Ohta Makoto, Mori Koji, Toma Naoki

Journal of Neuroendovascular Therapy ( 特定非営利活動法人日本脳神経血管内治療学会 ) 15 ( 4 ) 233 - 239 2020年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

#BObjective:#BR To ensure safe coil embolization for intracranial aneurysms, it is important to investigate the contact force between the coil and the aneurysm wall. However, it is unclear how the catheter tip position and the diameter of the secondary loop of the coil influence the contact force. In this study, we measured the contact force between a coil and an aneurysm biomodel under different conditions.
#BMethods:#BR A commercially available coil was inserted through a microcatheter into a silicone rubber aneurysm model at a constant speed (1 mm/s) using an automatic stage, and the contact force between the coil and the aneurysm wall was measured by a force sensor attached on the aneurysm model. The inner diameter of the spherical aneurysm was 5 mm. The effects of varying the position of the catheter tip (near dome, center, near neck) and the diameter of the secondary coil (4.5 mm) were evaluated.
#BResults:#BR When the catheter tip was inserted more deeply into the aneurysm (especially near the dome), the contact force increased. The contact force also increased as the secondary coil diameter was increased with the catheter tip near and in the center of the dome.
#BConclusion:#BR These results suggest that the catheter tip position and the secondary coil diameter affect the contact force. In particular, the contact force should be considered large with the catheter tip near the dome to ensure safe coil deployment.

DOI： 10.5797/jnet.oa.2020-0069

CiNii Article

CiNii Research

PubMed

その他リンク： https://ci.nii.ac.jp/naid/130007949975

形状記憶ポリマーを用いた剛性と感度を可変のロボットアーム招待有り査読有り

高嶋一登

計測と制御 ( 公益社団法人計測自動制御学会 ) 59 ( 11 ) 847 - 851 2020年11月

Improved method of estimating the contact force acting on an endovascular treatment device using image processing 査読有り国際誌

T. Onishi, K. Takashima

Seventeenth International Conference on Flow Dynamics (ICFD2020) 306 - 307 2020年10月

Development of a stereo dip-coating system for fabrication of tube-shaped blood vessel models 査読有り国際誌

Y. Shimizu, S. Tupin, C. Kiyomitsu, K. Kitamura, K. Takashima, M. Ohta

Scientific Reports 10 ( 1 ) Article number: 6929 (10 pages) 2020年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

Tube-shaped blood vessel models that mimic their geometries and mechanical properties can deliver reliable and realistic behavioral information such as deformation and rupture during procedures such as insertion of medical devices. Thickness of vessel walls is an important parameter for fabricating the blood vessel models owing to their strong influence on the model behavior, especially during deformation. The dip-coating method is used to fabricate blood vessel models; however, non-uniform wall thicknesses are observed using this method. This study aimed at finding the characteristics of stereo “angular control dip-coating” (ACDC) system to develop a dip-coating system that can produce tubular models with uniformed wall thickness. The system developed here enables an observation of the substrate behavior from two different views. The conditions of dip-coating used in this study produce 1.36–1.82 mm in the maximum and 0.188–0.435 mm in minimum wall thickness and the fabricated walls cover the realistic range of carotid arterial dimensions. The characteristics of the ACDC system indicate that ACDC is effective for fabricating the uniform wall thickness particularly in the strong curved parts.

DOI： 10.1038/s41598-020-63718-w

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85083865223&origin=inward

Dielectric elastomer based stretchable textile sensor for capturing motion 査読有り

Singh N.K., Takashima K., Shibata T.

Proceedings of SPIE - The International Society for Optical Engineering 11375 2020年04月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2020 SPIE. This paper presents the fabrication, electromechanical modelling and testing of a highly stretchable textile-dielectric elastomer capacitive sensor for capturing motion. The proposed sensor is made of conductive fabric as electrode and ultra-Thin dielectric elastomer film as dielectric. This type of capacitive sensor exhibits high linearity and sensitivity as compare to available commercial sensors. By using basic calibration technique integrated with microelectronics, such sensors can easily capture motion and can also be paired with a mobile application, which is capable of visualizing the recorded 3D movement in real time domain, has the potential to be used in wearables.

DOI： 10.1117/12.2565743

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85085581633&origin=inward

Development of catheter-type tactile sensor composed of polyvinylidene fluoride (PVDF) film 査読有り国際誌

K. Takashima, K. Ota, M. Yamamoto, M. Takenaka, S. Horie, K. Ishida

ROBOMECH Journal 6 ( 1 ) Article:19 (11pp) 2019年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

To achieve quantitative palpation in vivo, we developed a catheter-type tactile sensor composed of a polyvinylidene fluoride film for minimally invasive surgery. We evaluated the fundamental performance of the prototype sensor by a weight-drop test. We also measured the output of the prototype sensor as it was inserted into a blood vessel model with shapes mimicking lesions. The ø2-mm sensor passed easily into the blood vessel model with lesion-like shapes. Sensor outputs corresponded to the shape of the inner wall of the blood vessel model, making it possible to determine the position of a protrusion and the convexity interval of a rough surface by filtering and frequency analysis of the output.

DOI： 10.1186/s40648-019-0147-9

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85076525558&origin=inward

A rigid multibody model to study the translational motion of guidewires based on their mechanical properties 査読有り

Sharei H., Kieft J., Takashima K., Hayashida N., Van Den Dobbelsteen J.J., Dankelman J.

Journal of Computational and Nonlinear Dynamics 14 ( 10 ) 2019年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

During percutaneous coronary interventions (PCI), a guidewire is used as an initial way of accessing a specific vasculature. There are varieties of guidewires on the market and choosing an appropriate one for each case is critical for a safe and successful intervention. The main objective of this study is to predict the behavior of the guidewire and its performance in a vasculature prior to the procedure. Therefore, we evaluate the effectiveness of different mechanical properties of the guidewire on its behavior. A twodimensional (2D) model has been developed in which a guidewire is considered as a set of small rigid segments connected to each other by revolute joints. These joints have two degrees-of-freedom to allow rotation. Linear torsional springs and dampers are applied in each joint to account for the elastic properties of the guidewire; the elastic properties have been measured for two commercially available guidewires (Hi-Torque Balance Middleweight Universal II - Abbot and Amplatz Super Stiff - Boston Scientific) and these are used in the model. Only translational motion has been applied to the guidewires and the effect of bending stiffness of the guidewire and also friction between guidewire and vasculature on its behavior are investigated. The results are validated with actual movement of the guidewires in a simple phantom model. Behavior of a guidewire in a vasculature was predicted using the developed model. The results of both simulation and experiment show that the behavior of a guidewire is influenced by its mechanical properties and by the friction between the guidewire and vasculature. This study is the first step to develop a complete model, which can predict the behavior of a guidewire inside the vasculature. We compared the tip trajectory for two commercial guidewires in one vasculature geometry. In future, this kind of knowledge might support not only the interventionist in choosing the best suitable guidewire for a procedure but also the designer to optimize new instrument to have the desired behavior.

DOI： 10.1115/1.4043618

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85107464106&origin=inward

Fundamental study on the estimation of the contact force acting on an endovascular treatment device using image processing 査読有り

K. Takashima, T. Sasaki

6th International Conference on Computational and Mathematical Biomedical Engineering 469 - 472 2019年06月

形状記憶ポリマーを用いた触覚センサのロボットアームへの応用査読有り

長田拡,高嶋一登,向井利春

計測自動制御学会論文集 ( 公益社団法人計測自動制御学会 ) 55 ( 1 ) 25 - 34 2019年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

Tactile sensors typically have elastic covers for reducing the impact of objects that make contact with the sensor. However, elastic covers decrease the spatial resolution of the sensor because of their low-pass spatial filtering characteristics, which vary based on the stiffness of each cover. Therefore, we propose a tactile sensor that uses shape-memory polymer (SMP) with stiffness that varies based on temperature. SMPs can be deformed above their glass transition temperature (Tg) upon application of a small load. The reversible change in the elastic modulus between the glassy and rubbery states of an SMP can be on the order of several hundred-fold. These characteristics can be exploited to alter the spatial resolution and the rigidity of the sensor surface by adjusting the temperature of the SMP. In this study, a prototype sensor was fabricated using an SMP sheet with embedded electrical heating wires, and its fundamental performance was evaluated. The experimental results of a preliminary proof-of-concept investigation conducted using the prototype confirm the feasibility of the proposed sensor. Moreover, using a 4×4 array of pressure sensors, it was possible to distinguish the shape of the object placed on the sensor above and below Tg. The center of pressure applied on the prototype sensor could be measured by a developed program. In addition, we evaluated the control of the position of an object on the robot arm utilizing the prototype sensor attached on the arm. We could hold the constant position of the object on the sensor, although it took a longer time to stabilize the object above Tg because of the deformation of the SMP.

DOI： 10.9746/sicetr.55.25

CiNii Article

CiNii Research

その他リンク： https://www.jstage.jst.go.jp/article/sicetr/55/1/55_25/_pdf

　前のページ - 次のページ　

<髙嶋 一登>

論文 - 髙嶋 一登

<髙嶋　一登>

論文 - 髙嶋　一登