Updated on 2024/03/30

写真a

 
TAKARADA,Jun
 
Organization
Faculty of Engineering Science Associate Professor
Title
Associate Professor
External link

Degree

  • 博士（工学） ( 2012.3 )

Education

  • University of Tsukuba   Other

    - 2012

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  • Kansai University   Graduate School, Division of Engineering

    - 2009

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  • Kansai University   Faculty of Engineering

    - 2007

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Papers

  • Applicability of a Piezoelectric Sensor to Measure English Speaking Anxiety in a Communicative Context Reviewed

    Jun TAKARADA, Isamu NAKAGAWA, Shun NAKAMURA, Hiroki KAMATA, Aoi KAWAMURA, Michiko UEKI, Takafumi WAKITA, Jun MORIYA, Miho YANAGI, Kazuaki KUROKI, Wataru AMANO, Takanori MUTO, Miki DEGUCHI, Rie NISHIO, Koji TAKESHITA, Osamu TAKEUCHI, Yoshiro TAJITSU

    Journal of the Institute of Electrostatics Japan   47 ( 1 )   2 - 7   2023.1

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    Authorship：Lead author  

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  • Application of Piezoelectric PLLA Braided Cord as Wearable Sensor to Realize Monitoring System for Indoor Dogs with Less Physical or Mental Stress Reviewed

    Yoshiro Tajitsu, Jun Takarada, Tokiya Hikichi, Ryoji Sugii, Kohei Takatani, Hiroki Yanagimoto, Riku Nakanishi, Seita Shiomi, Daiki Kitamoto, Takuo Nakiri, Osamu Takeuchi, Miki Deguchi, Takanori Muto, Kazuaki Kuroki, Wataru Amano, Ayaka Misumi, Mitsuru Takahashi, Kazuki Sugiyama, Akira Tanabe, Shiro Kamohara, Rei Nisho, Koji Takeshita

    Micromachines   14 ( 1 )   143 - 143   2023.1

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    Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

    We attempted to realize a prototype system that monitors the living condition of indoor dogs without physical or mental burden by using a piezoelectric poly-l-lactic acid (PLLA) braided cord as a wearable sensor. First, to achieve flexibility and durability of the piezoelectric PLLA braided cord used as a sensor for indoor dogs, the process of manufacturing the piezoelectric PLLA fiber for the piezoelectric braided cord was studied in detail and improved to achieve the required performance. Piezoelectric PLLA braided cords were fabricated from the developed PLLA fibers, and the finite element method was used to realize an e-textile that can effectively function as a monitoring sensor. As a result, we realized an e-textile that feels similar to a high-grade textile and senses the complex movements of indoor dogs without the use of a complex computer system. Finally, a prototype system was constructed and applied to an actual indoor dog to demonstrate the usefulness of the e-textile as a sensor for indoor dog monitoring.

    DOI： 10.3390/mi14010143

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  • Application of High-Photoelasticity Polyurethane to Tactile Sensor for Robot Hands Reviewed

    Masahiko Mitsuzuka, Jun Takarada, Ikuo Kawahara, Ryota Morimoto, Zhongkui Wang, Sadao Kawamura, Yoshiro Tajitsu

    Polymers   14 ( 23 )   5057-1 - 5057-14   2022.11

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    Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

    We developed a tactile sensor for robot hands that can measure normal force (FZ) and tangential forces (FX and FY) using photoelasticity. This tactile sensor has three photodiodes and three light-emitting diode (LED) white light sources. The sensor is composed of multiple elastic materials, including a highly photoelastic polyurethane sheet, and the sensor can detect both normal and tangential forces through the deformation, ben sding, twisting, and extension of the elastic materials. The force detection utilizes the light scattering resulting from birefringence.

    DOI： 10.3390/polym14235057

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  • Frequency response analysis of piezoelectric resonance of poly-lactic acid film for bending angle detection Reviewed

    Jun Takarada, Riku Nakanishi, Yizhao Wang, Ken Yamamoto, Kenichi Mori, Masamichi Ando, Yoshiro Tajitsu

    Japanese Journal of Applied Physics   61 ( SN )   SN1035-1 - SN1035-6   2022.9

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

    Abstract

    The relationship between the output voltage from a poly-lactic acid piezoelectric film sensor and the bending angle of it can be derived by analyzing the resonance frequency of the sensor changes with the bending angle using the finite element method. The proposed sensor was excited and its oscillation was observed using the piezoelectricity of poly-lactic acid. The output voltage was amplified by resonating a brass plate with a slit. The frequency changes significantly with bending because the change in frequency of resonance of the metal substrate with high mechanical Q was measured. The resonance frequency increased linearly when the bending angle ranged from 0° to 5°. It was also confirmed that the correspondence between the frequency and the bending angle is uniquely determined because there was only one peak of the output voltage amplitude for inputs of multiple frequencies.

    DOI： 10.35848/1347-4065/ac85f8

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    Other Link： https://iopscience.iop.org/article/10.35848/1347-4065/ac85f8/pdf

  • Evaluation of gripping sensor using polyurethane with high photoelastic constant Reviewed

    Jun Takarada, Masahiko Mitsuzuka, Yo Sugino, Tatsuya Mori, Masakazu Kageoka, Tsutomu Tawa, Sadao Kawamura, Yoshiro Tajitsu

    Japanese Journal of Applied Physics   vol. 60 pp. SFFD03_1-5   2021.9

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  • A Prototype Sensor System Using Fabricated Piezoelectric Braided Cord for Work-Environment Measurement during Work from Home Reviewed

    Yoshiro Tajitsu, Jun Takarada, Kohei Takatani, Riku Nakanishi, Hiroki Yanagimoto, Seita Shiomi, Isamu Nakagawa, Ikuo Kawahara, Takuo Nakiri, Saki Shimda, Yoji Shimura, Takuto Nonomura, Kazunori Kojima, Atsuhisa Ikeguch, Kazuhiro Okayama, Tomohiro Sakai, Yuichi Morioka, Mitsuru Takahashi,, Kazuki Sugiyama, Rei Nisho, Koji Takeshita

    Micromachines   vol. 12 pp. 966_1-13   2021.8

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  • Local Evaluation of Piezoelectricity of Polyester Polymer Processed with Microwave Heating Reviewed

    Jun Takarada, Yifu Tang, Takaaki Tone, Kohei Takatani, Shingo Tnaka, Yoshihiko Nishizawa, Masamichi Ando, Daisuke Manai, Masayuki Kabata, Tomoya Mizumori, Makoto Kusunoki, Takanori Matsuyama, Yoshiro Tajitsu

    Journal of the Institute of Electrostatics Japan   vol. 45, pp. 28-33   2021.1

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  • Relationship between Photoelasticity of Polyurethane and Dielectric Anisotropy of Diisocyanate, and Application of High-Photoelasticity Polyurethane to Tactile Sensor for Robot Hands Reviewed

    Masahiko Mitsuzuka, Yuho Kinbara, Mizuki Fukuhara, Maki Nakahara, Takashi Nakano, Jun Takarada, Yoshiki Mori, Tsutomu Tawa, Sadao Kawamura, Yoshiro Tajitsu

    Polymers   vol. 13, pp. 143_1-19   2021.1

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  • Surface Charge Dependence on Load in Amorphous Stereocomplex Poly(Lactic Acid) Electrets Processed with Microwave Heating Reviewed

    Jun Takarada, Yifu Tang, Yoshihiko Nishizawa, Masamichi Ando, Yoshiro Tajitsu

    Japanese Journal of Applied Physics   vol. 59, pp. SPPE02_1-6   2020.9

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  • Application of a Piezoelectric Braided Cord to Sense Vital Signs during Sleep Reviewed

    Yoshiro Tajitsu, Jun Takarada, Kohei Takatani, Hiroki Yanagimoto, Shin Toguchi, Riku Nakanishi, Seita Shiomi, Syunpei Machino, Shingo Tanaka, Takuo Nakiri, Saki Shimda, Yoji Shimura, Takuto Nonomura, Rei Nishio, Koji Takeshita

    Japanese Journal of Applied Physics   vol. 59, pp. SPPD06_1-11   2020.8

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  • Application of piezoelectric electrets to an energy-harvesting system Reviewed

    Yoshiro Tajitsu, Jun Takarada, Masaki Hiramoto, Takahiro Nakatsuji, Takuo Nakiri, Kenji Imoto, Shingo Kaimori, Yoshiaki Shikata

    Japanese Journal of Applied Physics   vol. 58, pp. SLLD05-1_5   2019.8

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  • Domain switching of ferroelectric polymer film using piezoelectric force microscopy Reviewed

    Takarada Jun, Sato Hiroki, Furukawa Akio

    Jpn. J. Appl. Phys.   vol. 54, pp. 10NA17-1_6 ( 10 )   10NA17   2015.9

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    Language：English   Publisher：Institute of Physics  

    We attempted to clarify the domain switching dynamics in a microscale region of the ferroelectric copolymer poly(vinylidene fluoride–trifluoroethylene) using piezoelectric response force microscopy (PFM). Spatial nonuniformity of the electric field occurred in the polarization operation using PFM owing to the application of a voltage to the cantilever tip. From the nonuniformity in the thickness direction, we found that the nucleation of domain switching occurred unless an electric field exceeding the coercive electric field was applied from the front surface to the back surface of the film. From this finding, it is assumed that a region with a switching domain cannot spread in the film face direction unless the region is penetrated in the thickness direction. Also, we found that the nonuniformity in the film face direction affects the configuration of domain switching and that the domain area can be divided into regions where the polarization is switched rapidly, domain walls move slowly, and both these phenomena occur. These phenomena can be applied to not only the polarization reversal process of ferroelectric polymers but also general polarizations using scanning probe microscopy.

    DOI： 10.7567/JJAP.54.10NA17

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  • Fundamental Study on Vibration in Edge Face of Piezoelectric Chiral Polymer Film Reviewed

    Jun Takarada, Takuya Kataoka, Ken Yamamoto, Takuo Nakiri, Atsuko Kato, Tetsuo Yoshida, Yoshiro Tajitsu

    Japanese Journal of Applied Physics   vol. 52, pp. 09KE01-1_5   2013.5

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  • Measurement of Liquid Viscosity and Density Using Single Piezoelectric Resonator with Two Vibration Modes Reviewed

    Jun Takarada, Naoto Wakatsuki, Koichi Mizutani, Ken Yamamoto

    Japanese Journal of Applied Physics   vol.51, pp. 07GB07_1-6   2012.5

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  • Monolithic Piezoelectric Sensor for Measurement of Triaxial Forces Applied to Bridge by String Vibration Reviewed

    Jun Takarada, Naoto Wakatsuki, Koichi Mizutani

    Japanese Journal of Applied Physics   vol.50, pp. 07HC03_1-5   2011.5

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  • Precise Wireless Triggering System for Anemometers with Long-baseline Acoustic Probes Reviewed

    Naoto Wakatsuki, Shin Kinjo, Jun Takarada, Koichi Mizutani

    Japanese Journal of Applied Physics   vol. 49, pp. 07HC14_1-4   2010.5

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  • Numerical Analysis of Piezoelectric Sensor Using Multimode Vibration for Liquid Density and Viscosity Measurement Reviewed

    Jun Takarada, Naoto Wakatsuki, Koichi Mizutani, Ken Yamamoto

    Japanese Journal of Applied Physics   vol. 49, pp. 07HC02_1-4   2010.5

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  • Vibration Control of Piezoelectric PZT Ceramics Using Negative Capacitance Reviewed

    Jun Takarada, Kenji Imoto, Ken Yamamoto, Munehiro Date, Eiichi Fukuda, Yoshiro Tajitsu

    Japanese Journal of Applied Physics   vol. 47, pp. 7698-7701   2008.5

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  • Basic Study of Control of Soft and Hard Piezoelectric Materials Using Different Types of Negative-Capacitance Circuits Reviewed

    Jun Takarada, Komei Tahara, Kenji Imoto, Munehiro Date, Eiichi Fukada, Ken Yamamoto, Yoshiro Tajitsu

    Japanese Journal of Applied Physics   vol. 46, pp. 7053-7057   2007.5

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  • Lead Zirconate Titanate (PZT) Materials Using Negative-Capacitance Circuits to Sound shielding Technology Reviewed

    Komei Tahara, Hiroaki Ueda, Jun Takarada, Kenji Imoto, Ken Yamamoto, Munehiro Date, Eiichi Fukada, Yoshiro Tajitsu

    Japanese Journal of Applied Physics   vol. 45, pp. 7422-7425   2006.5

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Research Projects

  • Establishing an objective measurement of L2 listening anxiety through the use of sensing devices.

    Grant number：21K00776  2021.4 - 2024.3

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

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    Grant amount：\4030000 （ Direct Cost: \3100000 、 Indirect Cost：\930000 ）

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  • プローブ顕微鏡による強誘電高分子の分域構造の解明

    Grant number：20K04566  2020.4 - 2023.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    宝田 隼

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    Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）

    本研究の目的は走査型プローブ顕微鏡の微視的な物性評価技術により強誘電高分子膜の分極反転及び相転移はどこから始まりどのように広がっていくのかを明らかにすることである．
    2021年度までにカンチレバーの接触共振により測定精度を向上させた．これにより従来のPFMでは信号が小さく分域構造が把握できない未分極領域においても分域構造を把握できる可能性を得た．本技術により従来のプローブ顕微鏡の弾性，圧電性測定より10倍以上の精度が期待できる．
    さらに接触共振型PFMを用いて強誘電高分子P(VDF/TrFE)の微少領域における分極度合を観察した．温度を増加させながらその場の環境下で観察することでその高分子の脱分極度合を解析した結果、粒子毎に異なる温度で脱分極が生じていることがわかった．観測領域における脱分極領域の割合分布を解析した結果、結晶化温度付近からある温度幅を持って脱分極領域が増えていくことがわかった．本結果は脱分極電流等の巨視的な測定結果を概ね一致する． これらのことから，相転移は粒子毎に生じ，粒子の集合体は結晶化温度付近で温度幅を持って統計的に相転移していることが考えられる．本研究成果により，本膜をメモリとして活用するための記憶密度，温度耐性等の指標を提供することとなり，未来のIoT社会の身に着けることのできるフレキシブルなデバイスが持つ膨大なデータを支える次世代のメモリとして活用することにつながる．

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