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Kazuya Tada

  (多田 和也)

Profile Information

Affiliation
准教授, 大学院 工学研究科, 兵庫県立大学
Degree
Ph.D(Osaka University)
Researcher number
90305681
ORCID ID
 https://orcid.org/0000-0001-5697-4048
J-GLOBAL ID
200901068509763714
researchmap Member ID
1000254210
External link

Research Interests

 7

Research Areas

 1

Research History

 3

Education

 3

Committee Memberships

 22
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Awards

 5

Papers

 186
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Misc.

 148
  • 117(313) 17-20, Nov 17, 2017  
  • 2016(71) 51-55, Jul 14, 2016  
  • 115(265) 1-6, Oct 23, 2015  
  • Tada Kazuya
    Technical report of IEICE. OME, 114(393) 11-14, Jan 21, 2015  
    Due to the expectation for the renewable energy source, photovoltaic devices with novel materials such as organic substances have attracted much attention. To get deeper insight of the device performance, the extraction of device parameters by fitting the illuminated current-voltage characteristics with the 1-diode equivalent circuit model, which consists of an ideal photocurrent source, a diode, and series and parallel resistances, is routinely carried out. In many cases, the forth quadrant of the characteristic is mainly used for this purpose. Although a lot of papers on the efficient fitting computational methods have been published, the features of the model itself in terms of the curve fitting have been rarely discussed. Here, it is shown that the fitting ability of the simple one-diode model is so high that the evaluation of the ideality factor of the diode is difficult, when the target photovoltaic device has sufficiently high series resistance and low parallel resistance. This condition is frequently satisfied by bulk-heterojunction organic thin-film photovoltaic devices. On the other hand, the estimation of the ideality factor from the dark characteristics is found to be rather easy, because of the high parallel resistance.
  • Tada Kazuya
    Proceedings of the Society Conference of IEICE, 2014(2) 89-89, Sep 9, 2014  
  • TADA Kazuya
    Technical report of IEICE. OME, 112(469) 17-20, Mar 8, 2013  
    Usually, fullerenes are used in a form of highly soluble derivatives such as PCBM in the studies of polymer photovoltaic devices using bulk heterojunction composites of polymers and fullerenes. However, it has been found that it is possible to make bulk heterojunction composites with neat fuUerenes such as C_<60> and C_<70>, if we choose suitable solvents. In this study, the preparation of polymer photovoltaic devices with bulk heterojunction composites using poly(3-hexylthiophene) and neat fuUerenes using 1,2,4-trimethylbenzene (pseudocumene)is reported. In addition to the results reported in the previous works, the equivalent circuit parameters were estimated by fitting the current density-voltage characteristics with a model equivalent circuit of photovoltaic devices.
  • KODAMA Mitsuhiro, TADA Kazuya
    Technical report of IEICE. OME, 112(304) 7-10, Nov 12, 2012  
    Conjugated polymers have been attracting attentions because they can offer simple manufacturing processes of electronic devices. Since most of them have relatively low melting point, electronic devices using conjugated polymers such as solar cells placed at hot place will be severely affected by the liquefying of the polymer. However, there are few studies on this issue. Here, we report the change in the appearance and the electrical characteristics of sandwich-type devices based on a conjugated polymer poly(3-dodeculthiophene) having vacuum-evaporated Au electrode before, during and after melting the conjugated polymer.
  • Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the IEICE General Conference, 2012(2) 158-158, Mar 6, 2012  
  • TADA Kazuya, ONODA Mitsuyoshi
    Technical report of IEICE. OME, 111(236) 43-46, Oct 11, 2011  
    Conjugated polymer-fullerene composite is currently recognized as a key material for organic solid-state photocells. Because of poor solubility of fullerenes such as Co in common organic solvents, chemically modified fullerenes having high solubility are widely used. The electrophoretic deposition allows one to prepare thin films from dilute solutions. We have reported the preparation of conjugated polymer-C_<60> composite films based on PDOF-MEHPV and MEHPPV by this technique. Here, it is reported that the surface morphology of the composite films strongly depends on the polymer used
  • TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 111(212) 13-16, Sep 15, 2011  
    Conjugated polymer-fullerene composite is currently recognized as a key material for organic solid-state photocells. Because of poor solubility of fullerenes such as C_<60> in common organic solvents, chemically modified fullerenes having high solubility are widely used. The electrophoretic deposition allows one to prepare thin films from dilute solutions. MEHPPV-C_<60> composite films prepared by this technique have been previously reported. However, the porosity of the films prepared by the electrophoretic deposition had made it difficult to check the photovoltaic effects in the films. Here, we report a method to obtain flat composite films consisting of MEHPPV and unmodified C_<60>.
  • KODAMA Mitsuhiro, TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 111(212) 9-12, Sep 15, 2011  
    Some conjugated polymers show unique phenomena associated with solid-liquid transition such as changes in optical absorption spectra and sign inversion of photocarrier. It is also known that the conductivity changes drastically near the melting point. There are few reports on electronic devices with molten conjugated polymers, though fusible conducting polymers have interesting properties. In this report, the fabrication process of two-terminal device using molten regioregular poly(3-dodecylthiophene) is shown.
  • TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 111(73) 17-20, May 20, 2011  
    Conjugated polymer-fullerene composite is currently recognized as a key material for organic solid-state photocells. Because of poor solubility of fullerenes such as C_<60> in common organic solvents, chemically modified fullerenes having high solubility are widely used. The electrophoretic deposition allows one to prepare thin films from dilute solutions, therefore, it is possible to make conjugated polymer films containing relatively large amount of unmodified C_<60>. However, the porosity of the films prepared by the electrophoretic deposition makes it difficult to check the photovoltaic effects in the films. Here, we report flat composite films consisting to conjugated polymer and unmodified C_<60> which are obtained by applying a method to flatten electrophoretically deposited conjugated polymer films.
  • Masashi Saitoh, Junpei Yuasa, Kazuya Tada, Mitsunobu Onoda, Takuya Nakashima, Tsuyoshi Kawai
    9TH INTERNATIONAL CONFERENCE ON NANO-MOLECULAR ELECTRONICS, 14 52-57, 2011  
    Fabrication of nanorods (NRs) composed of a cationic Au(I) complex was demonstrated by means of the solution-injection method. A colloidal solution of the NRs showed brilliant bluish green photoluminescence with a quantum yield as high as 58%. The NRs were found to be 100-400 nm in width and 3-5 mu m in length by transmission electron microscopy observations. Pattern formation of the NRs was achieved successfully after a selective electrophoretic deposition onto an indium tin oxide coated glass substrate, which maintains a relatively high luminescence quantum yield. (C) 2010 Published by Elsevier B.V.
  • Kazuya Tada, Mitsuyoshi Onoda
    9TH INTERNATIONAL CONFERENCE ON NANO-MOLECULAR ELECTRONICS, 14 58-61, 2011  
    The transient current during electrophoretic deposition of conjugated polymer is a promising tool for exploring the basic process of the deposition. In this paper, it has been shown that the transit times obtained from various electrode distances give almost identical electrophoretic mobility. The result shown here seems to support our interpretation of the transient current profile during electrophoretic deposition that it reflects the drift motion of colloidal particles in suspension driven by the electric field. (C) 2010 Published by Elsevier B.V.
  • Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the Society Conference of IEICE, 2010(2) "S-13"-"S-14", Aug 31, 2010  
  • Okada Masayuki, Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the Society Conference of IEICE, 2010(2) "S-11"-"S-12", Aug 31, 2010  
  • TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 110(157) 11-14, Jul 22, 2010  
    Electrophoretic deposition of conjugated polymers realizes the films of the polymers with a variety of surface morphologies from nanoporous one to flat one. In this study, it has been attempted to utilize an ultrasonic atomizer in the preparation of suspensions for electrophoretic deposition. The transient electric current recorded during the electrophoretic deposition suggests that the reduction of particle size due to the ultrasonic application.
  • ONODA Mitsuyoshi, OKADA Masayuki, TADA Kazuya
    2010(1) 5-10, May 21, 2010  
  • Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the IEICE General Conference, 2010(2) 153-153, Mar 2, 2010  
  • Reports of Graduate School of Engineering, University of Hyogo, (63) 13-17, 2010  
  • TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 109(251) 23-26, Oct 16, 2009  
    Transient electric currents during the electrophoretic deposition of a fluorene-based conjugated polymer poly[(9,9-dioctyl-2,7-divinylene-fluorenylene)-alt-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene}] have been measured. The electric currents measured by using the experimental setup used so far, in which the two electrodes are immersed in a glass cuvette filled with the colloidal suspension of the polymer, have been found to difficult to analyze, reflecting the complicated travelling paths of colloidal particles. The new experimental setup, which has been made by sandwiching a silicone rubber spacer between two electrodes, has been found to give transient currents with clear breaks in the case of the suspension with high polymer concentration.
  • HIRAIWA Akie, TADA Kazuya, KONDO Mizuho, KAWATSUKI Nobuhiro
    IEICE technical report, 109(251) 31-34, Oct 16, 2009  
    Patterned polarized blue light emission was achieved using a new liquid crystalline fluorene derivatives (F1) on a patterned photoalignment layer. Adjusting the exposure energy of linearly polarized (LP) UV light to the photoalignment layer controlled the alignment direction of FL, which coincided with the molecular reorientation direction of the photoalignment layer. An electroluminescent device with orthogonally patterned molecular orientation was fabricated, demonstrating a patterned polarized light emission.
  • Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the Society Conference of IEICE, 2009(2) 126-126, Sep 1, 2009  
  • ONODA Mitsuyoshi, ABE Yayoi, TADA Kazuya, KAWAKITA Yusuke, FUJISATO Toshia, UTO Sadahito
    IEICE technical report, 109(48) 35-40, May 15, 2009  
    The purpose of this study is to develop electrodes for electrical stimulation of the nervous system using conductive polymers, polypyrrole (PPy) and/or poly(3,4-ethylenedioxythiophene), PEDOT. We evaluated biocompatibility in fibroblast and/or myoblast of mouse. Cultured cells on PPy and/or PEDOT extended their neuritis and survived over a week. These experiments have demonstrated that conductive polymers such as PPy, PEDOT, etc. have high biocompatibility, and PPy and/or PEDOT are applicable to nerve stimulation electrodes.
  • TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 108(225) 23-26, Sep 30, 2008  
    Polymer light-emitting devices have been fabricated by using the electrophoretic deposition of a fluorene-based conjugated polymer, poly[(9,9-dioctyl-2,7-divinylene-fluorenylene)-alt-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene}]. In the course of the fabrication of the devices with ITO/PEDOT:PSS:PDOF-MEHPV/MgAg structure, it has been found that the deposition process of PDOF-MEHPV by means of the electrophoretic deposition has seriously affected by the coating of ITO electrodes with PEDOT:PSS film. This may come from the alteration of electric field between the electrodes due to the insertion of PEDOT:PSS film during the electrophoretic deposition.
  • TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 107(217) 23-26, Sep 13, 2007  
    The electrophoretic deposition of a fluorene-based conjugated polymer, poly[(9,9-dioctyl-2,7-divinylene-fluorenylene)-alt-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene}] is reported. It has been found that the morphology of the resultant film strongly depends on the good/poor solvent ratio of the suspension. That is, the film deposited from a suspension with more good solvent tends to be smoother. It has also been found that the suspension containing 60% of good solvent can also be used for the electrophoretic deposition.
  • ONODA Mitsuyoshi, KOBAYASHI Shinichi, TADA Kazuya
    IEICE technical report, 107(47) 29-34, May 11, 2007  
    Conjugated polymers with growth patterns have prepared by electrochemical polymerization. The groth patterns depend on the polymerization conditions; kinds of solvent, concentration of electrolyte and monomer, temperature etc. Therefore, neuron-type conjugated polymers can be fabricated. The fellow fractal patterns can be connected by changing the polymerization conditions during polymerization. The nucleus and fractal pattern of neuron-type conjugated polymers correspond to the nucleus of cell body and axon (dendrite) of neuron. The connecting points of fractal pattern correspond to the synapse of neuron. In neuron-type conjugated polymers, the systems which imitated molecular communications may be fabricated.
  • Onoda Mitsuyoshi, Tada Kazuya
    Reports of Graduate School of Engineering, University of Hyogo, 59 1-8, Feb 28, 2007  
    We have investigated on the thermochromic behaviors of poly (p-phenylene vinykene) derivatives, poly (2, 5-dialkoxy p-phenylene vinylene) s, ROPPVs and poly (2, 5-dialkyl p-phenylene vinylene), RPPV. The temperature dependence of optical properties such as optical absorption and photoluminescence spectra and the variation of properties with the side chain length have been compared with those of poly (3-alkylthiophene) s, PATs. The bandgap energy of ROPPV increases gradually from 2.2 eV at room temperature to about 2.4 eV at 200℃, but that of RPPV does not depend on temperature and shows a nearly constant value of about 2.7 eV. The temperature dependence of bandgap energy is different from those of PATs and the difference can be tentatively interpreted in terms of the main chain structure. The photoluminescence intensities decrease monotonically with increasing temperature. We speculate on the separation of the excited species due to the reduction of distance between polymer main chains and the enhancement of the overlap of π-electrons with the twist of polymer main chains. Moreover, we have evaluated the electronic states of ROPPVs and RPPVs at the solid and liquid states from the measurement of ionization potentials.
  • Onoda Mitsuyoshi, Abe Yayoi, Tada Kazuya
    Reports of Graduate School of Engineering, University of Hyogo, 60 1-5, 2007  
    We have studied on carrier transport phenomena, especially the evaluation of the mobility and the nature of photocarrier, of regiorandom poly(3-octadecylthiophene), PAT 18 at solid-liquid phase transition by using a time-of-flight technique. With increasing temperature, the hole mobility gradually decreases and decreases sharply at solid-liquid phase transition. On the other hand, the negative carrier mobility can be evaluated in the range from 10^<-6> to 10^<-5> cm^2/Vs, which is comparably the hole mobility at solid state, above solid-liquid phase transition. Then the observed small hydrostatic pressure dependence of conductivity seems to support the interpretation of electronic transport even in liquid phase. Accordingly, the negative carrier is electron. These unique phenomena have been interpreted as modulation of electronic energy state based on conformational change of the PAT18 main chain.
  • NIIHO Shuta, MATOBA Masanori, TADA Kazuya, ONODA Mitsuyoshi
    2006(59) 25-30, Oct 27, 2006  
  • TAKAISHI Satoru, TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 106(252) 39-43, Sep 18, 2006  
    The electronic states of conducting polymer were investigated by a low-energy photoemission spectroscopy. A conducting polymer poly (3-methylthiophen) was deposited by electrochemical polymerization on Ni mesh. An open electrochemical cell with the polymer coated Ni mesh as working electrode was constructed and was used to in-situ measurement of photoemission spectrum during electrochemical doping of the polymer. A separate measurement of ex-situ photoemission spectrum, in which the working electrode was disconnected and was removed from the electrochemical cell for each spectrum acquisition, was also performed for comparison. The ionization potentials measured by the two methods were found to be different, suggesting that the latter data were influenced by the undoping of the polymer.
  • NIIHO Shuta, MATOBA Masanori, TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 106(252) 11-15, Sep 18, 2006  
    A conducting polymer-insulating polymer composite film was found to be made by electrolytic polymerization polypyrrole(PPy) on a poly(vinyl alcohol) coated indium-tin-oxide (ITO) electrode. Here, we have attempted to use this composite film to a PPy actuator by removing the PVA layer by dissolving in hot water. The motion of the actuator with various thickness was examined. The PPy actuator once bends toward the non-glossy side which was contacted with the electrolyte during polymerization and then bends toward the opposite side which was contacted with PVA during polymerization.
  • MATOBA Masanori, NIIHO Shuta, TADA Kazuya, ONODA Mitsuyoshi
    IEICE technical report, 106(252) 23-27, Sep 18, 2006  
    Conducting polymer-insulating polymer composite films were fabricated by electrochemically polymerizing pyrrole by using electrodes coated with poly (vinyl alcohol). Pyrrole was not polymerized when propylene carbonate was employed as solvent but pyrrole was polymerized when acetonitrile was employed, because only electrolytic solution using acetonitrile could penetrate into poly (vinyl alcohol) films. More uniform composite films were obtained by using poly (vinyl alcohol) dried in vacuum. The composite films show electrical conductivity of about 5 S/cm.
  • Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the Society Conference of IEICE, 2006(2) "S-31"-"S-32", Sep 7, 2006  
  • TADA Kazuya, ONODA Mitsuyoshi
    Technical report of IEICE. OME, 106(37) 9-10, May 11, 2006  
  • Onoda Mitsuyoshi, Tada Kazuya
    Proceedings of the IEICE General Conference, 2006(2) "S-52"-"S-53", Mar 8, 2006  
  • Onoda Mitsuyoshi, Ogura Akihiro, Tada Kazuya
    Proceedings of the IEICE General Conference, 2006(2) 113-113, Mar 8, 2006  
  • ONODA Mitsuyoshi, TADA Kazuya
    2005(90) 37-42, Oct 24, 2005  
  • TADA Kazuya, ONODA Mitsuyoshi
    Technical report of IEICE. OME, 105(305) 19-22, Sep 26, 2005  
    An emission-color conversion method proposed by the authors, the maskless dye-diffusion technique, has been applied to polymer light-emitting devices based on a conjugated polymer with efficient blue-emission, poly(9, 9-dioctylfluorene). The diffusion of a green-emitting fluorescent dye Coumarin 6 in the polymer results in green-emitting devices. However, the diffusion of red-emitting dye Nile red results in white-emitting devices. The increase in the emission onset voltage from the device with pure poly(9, 9-dioctylfluorene) was observed for both cases. These results suggest that both dyes act as carrier trap in the polymer as well as that the exciplex formation between the polymer and Nile red takes place.
  • ONODA Mitsuyoshi, SHONAKA Hirokazu, TADA Kazuya
    Technical report of IEICE. OME, 105(103) 35-39, May 20, 2005  
    A polypyrrole (PPy) film is electrochemically grown in a thin slab vessel consisting of poly (tetrafluoroethylene) (PTFE) walls, exhibits a notable anisotropy along the thickness. This anisotropy allows it to bend in a regular direction upon electrochemical undoping and reverts upon doping. In this paper, the size effect, i.e., the length dependence of the reduction current, of the actuator has been studied. The length was changed by trimming the tip of the actuator which was initially soaked for 12mm in the electrolyte. It has been clarified that the current is saturated when the length of actuator becomes longer than a certain length. Therefore, it is expected that the PPy actuator consists of two parts. One of them can be driven and the other can not be driven. This may be due to the reduction of conductivity of PPy upon undoping, which makes the tip of actuator almost be insulated from the power source. It is also found that the width of actuator and the electrolyte do not influence on the size effect.
  • Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the IEICE General Conference, 2005(2) "S-37"-"S-38", Mar 7, 2005  
  • TADA Kazuya, ONODA Mitsuyoshi
    Technical report of IEICE. OME, 104(289) 23-27, Sep 3, 2004  
    The photon/electron conversion performance of photocells based on conjugated polymers can be drastically increased by using donor-acceptor systems. Since most of the conjugated polymers such as MEHPPV are donor materials, doping of acceptor C_<60> molecules results in high photon/electron conversion efficiency. However, unmodified C_<60> shows poor solubility in common organic solvents, and thus the molecularly dispersion of C_<60> exceeding 10mol% into conjugated polymers is scarcely achieved. Here, we report that the electrophoretic deposition, which was originally developed by us as a method to prepare nanostructured conjugated polymer films, can yield MEHPPV-C_<60> composites in which 20mol% of C_<60> molecules are expected to be molecularly dispersed.
  • Hongawa Yoshiyuki, Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the IEICE General Conference, 2004(2) 143-143, Mar 8, 2004  
  • TADA Kazuya, WADA Masayuki, ONODA Mistusyoshi
    Technical report of IEICE. OME, 103(317) 7-10, Sep 19, 2003  
    Electronic devices such as diodes using a free-standing films of conducting polymer seem to provide maximum flexibility, because they do not have any supporting substrate which may suffer the flexibility of devices. However, the conductivity of pristine (undoped) conducting polymer is generally low and thus the devices made of them have relatively large series resistance. On the other hand, attempts to make a device by vacuum metallization on doped conducting polymer film will fail in the corrosion of the metal by dopant. In this study, we have tried to reduce the series resistance of a conducting polymer diode by selective doping at the chemically stable electrode side, employing a chimney-shaped dopant reservoir attached on the device.
  • HONGAWA Yoshiyuki, TADA Kazuya, ONODA Mitsuyoshi
    Technical report of IEICE. OME, 103(317) 11-16, Sep 19, 2003  
    The electronic states of the conducting polymer/metal interfaces were investigated by Kelvin probe method. A conducting polymer poly(3-octadecylthiophene) was coated on either Al or ITO substrate, and the dependence of the surface potential on temperature was measured by Kelvin probe method. In the case of Al, the dependence on the temperature is strongly influenced by the sample thickness. However, the samples on ITO do not show such influence on thickness. The surface potential of the sample on Al shows drastic change in the surface potential before and after heating. Because no notable change was observed in electronic state of PAT18 itself, it is speculated that the cause is the exposure of Al accompanying melt of a conducting polymer and the influence of oxide film formed on Al.
  • Onoda Mitsuyoshi, Tada Kazuya
    Proceedings of the Society Conference of IEICE, 2003(2) "S-29"-"S-30", Sep 10, 2003  
  • Onoda Mitsuyoshi, Tada Kazuya
    Proceedings of the Society Conference of IEICE, 2003(2) 107-107, Sep 10, 2003  
  • TADA Kazuya, ONODA Mistusyoshi
    Technical report of IEICE. OME, 103(285) 19-22, Sep 2, 2003  
    Here, we describe a novel method for electrode deposition onto a free-standing film of conjugated polymer, the peeling-off transfer technique, proposed by us. This method enables not only making double-sided electrodes structures without film flipping, but also simplifying the positioning between upper and lower electrodes. The electrodes in Schottky diodes fom poly(3-hexylthiophene) made through this technique show essentially identical characteristics to those made through direct vacuum evaporation. Although we checked this idea with conducting polymer here, this technique may be applicable to any other semiconducting materials with appropriate surface and mechanical properties.
  • KATO Yoshiyuki, TADA Kazuya, ONODA Mitsuyoshi
    Technical report of IEICE. OME, 103(84) 41-46, May 26, 2003  
    A method of preparing a large-size anisotropic polypyrrole (PPy) film using a slab vessel consisting of poly(tetrafluoroethylene) (PTFE) walls as well as its actuation properties is reported. The PPy film can be grown along one side of the PTFE walls and exhibits a morphological anisotropy along the thickness direction. A piece of it bends and reverts in a regular direction during a redox cycle without the use of any addditional processes such as lamination. The actuation characteristics of the anisotropic PPy film strongly depend on the size of the cation in the driving electrolyte. The bending of this actuator at room temperature becomes slower for larger cations. The temperature dependence of the characteristics of the anisotropic PPy film as actuator has been investigated. As the temperature increases, the arrival time of the actuator becomes shorter in all electrolyte solutions. This can be understood in terms of the thermally activated microscopic movement of polymer chains. It is also found that this actuator can lift an object which weighs more than 25 times of the weight of the actuator itself.
  • Kato Yoshiyuki, Shonaka Hirokazu, Tada Kazuya, Onoda Mitsuyoshi
    Proceedings of the IEICE General Conference, 2003(2) 117-117, Mar 3, 2003  

Books and Other Publications

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Major Teaching Experience

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Research Projects

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