FUJIMOTO, Hiroshi

写真a

Affiliation

Faculty of Human Sciences, School of Human Sciences

Job title

Professor

Homepage URL

http://www.f.waseda.jp/fujimoto/

Concurrent Post 【 display / non-display

  • Faculty of Science and Engineering   Graduate School of Advanced Science and Engineering

  • Affiliated organization   Global Education Center

  • Faculty of Human Sciences   Graduate School of Human Sciences

Education 【 display / non-display

  •  
    -
    1989

    Waseda University   Graduate School, Division of Science and Engineering   Mechanical Engineering  

  •  
    -
    1989

    Waseda University   Graduate School, Division of Science and Engineering   Mechanical Engineering  

Degree 【 display / non-display

  • Waseda University   Doctor of Engineering

  • 早稲田大学   博士(工学)

Research Experience 【 display / non-display

  •  
     
     

    通商産業省工業技術院生命工学工業技術研究所主任研究官

  •  
     
     

    The University of Electro-Communications

  •  
     
     

    Waseda University

Professional Memberships 【 display / non-display

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    IEEE

  •  
     
     

    バイオメカニズム学会

  •  
     
     

    日本ロボット学会

  •  
     
     

    日本機械学会

  •  
     
     

    日本人間工学会

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Research Areas 【 display / non-display

  • Intelligent robotics

  • Rehabilitation science

Research Interests 【 display / non-display

  • 生活支援技術、人工感覚器、バイオメカニックス、生体情報・計測、ロボティクス、人間機械システム

Papers 【 display / non-display

  • Effect of human forefinger postures of pressing on hardness identification

    SAKAGUCHI Saito, DOI Kouki, FUJIMOTO Hiroshi

    Transactions of the JSME (in Japanese)   83 ( 851 ) 17 - 00059-17-00059  2017

     View Summary

    <p>Hardness identification is one of the most important tactile senses in humans. People use their hands in various ways to identify the hardness of an object. For example, acupuncturists identify stiffness in a muscle by pressing down with their forefinger held flat over the affected area. However, experimental evidence for the role of the pressing method in the identification of an object's hardness even when the same finger is used has not been shown yet. In this fundamental study, we investigated the differential threshold of hardness for different finger postures of pressing (pressing down with one's forefinger held "flat" or "vertically") to determine the relationship between the different finger postures of pressing and hardness identification. We used seven elastic test pieces, each with a different Young's modulus, as the presented stimuli. We conducted an experiment using the constant method to calculate the differential threshold of hardness as a measure of hardness identification. The results showed that the differential threshold of hardness was higher when pressing down with a forefinger held "flat" than when pressing down "vertically" with the same force. This finding will be useful in evaluating the tactile identification of hardness in acupuncturists.</p>

    CiNii

  • Experimental study on shapes of tactile signs for distinguishable identification on body soap containers

    Doi, Kouki, Nishimura, Takahiro, Wada, Tsutomu, Fujimoto, Hiroshi, Hoshikawa, Yasuyuki

    Journal of Advanced Computational Intelligence and Intelligent Informatics   21 ( 1 ) 100 - 108  2017.01

     View Summary

    Japanese Industry Standards (JIS) S 0021 (Packaging - Accessible Design - General Requirements) indicate the design policy for easy-to-use packaging and containers, targeting various individuals including elderly persons and individuals with disabilities. The JIS S 0021 includes tactile signs that are necessary to ensure the ease of distinguishing and handling as well as the ease of using those packaging and containers. The JIS S 0021 prescribes tactile signs on shampoo containers and notches for beverage paper packaging containers as tactile signs to distinguish the contents of the package and to differentiate between containers with the same or similar shapes. The policy was expanded to include tactile signs for body soaps when the standard was amended in 2014, and this was attributed to the fact that organizations of visually impaired demanded tactile signs for body soap, since body soap is often packaged in containers with shapes similar to those for shampoos and hair conditioners. Hence, tactile signs prescribed for body soap in JIS S 0021 guidelines were recently expanded to commercially available body soap containers. In the present study, experiments were performed to study the shapes of tactile signs for distinguishable body soap container. Specifically, shapes were studied through the following two steps: 1) tactile signs were selected based on experiments to evaluate the ease of distinguishing between multiple tactile signs, in a hearing survey involving visually impaired; and 2) experiments were performed to evaluate the tactile signs assuming that they were manufactured in collaboration with the Japan Cosmetic Industry Association, which is an industry organization of manufacturers for body soap and other products. It should be noted that the experiments involving distinguishing between products prioritized tactile signs on the top surfaces of the containers instead of on the side, since visually impaired tend to distinguish between pump containers by touching the top surfaces of the containers in hotels and public restrooms. The results of the experiments were used for tactile signs in the amended JIS S 0021 in 2014 for body soap. This study described evaluation experiments performed on the distinguishability of tactile signs on the top surfaces of pump type body soap containers to determine the factors that should be considered when establishing JIS tactile signs for body soap containers.

  • Gait Characteristics of high scoreres of the locomotive syndrome

    SUZUKI Baku, KOBAYASHI Yoshiyuki, MOCHIMARU Masaaki, FUJIMOTO Hiroshi

    Journal of the Society of Biomechanisms   40 ( 3 ) 183 - 193  2016

     View Summary

    The purpose of this study was to identify the key joint kinematics characteristics during walking that related to Locomotive syndrome (LS) in order to develop some kind of device which can assess the risk of LS from gait on a daily basis. For this purpose, joint kinematics data during walking were obtained from 54 healthy community-dwelling elderly subjects (10 belong to LS). From these data, we calculated time-normalized lower limb joint angles on three planes during one gait cycle. For each time point, we also calculated averages and standard deviations of joint angles within the 5 trials. Principal component analysis (PCA) was conducted using input matrix made from the time–normalized lower limb joint angle kinematics (3 Planes × 3 Joints × 101 poins × 2 parameters). To determine Principal Component Vector (PCV) related to LS, we conducted t-tests on the Principal Component Scores of each PCV related to LS between LS group and non-LS group. To understand joint kinematics related to LS, we reconstructed them from each PCV related to LS. Among these PCVs, PCV 6 affect walking speed from hip and anlke joint angles point of view, and PCV 12 affect walking speed from cadence point of view. These PCVs revealed that LS group walks smaller walking speed than non-LS group. Further, PCV 9 related to ROM during walking on sagittal plane: LS group tended to showe smaller ROM than non-LS group. However, this PCV did not relate to spatiotemporal variables such as walking speed or step length. These findings suggest the possibility to develop some kind of sensor systems to assess LS using thesecharacteristics .

    CiNii

  • Induction of the Illusion of Index Finger Flex Movement and the Perceptual Properties

    UMESAWA Yumi, DOI Kouki, FUJIMOTO Hiroshi

    The Japanese journal of ergonomics   52 ( 2 ) 88 - 95  2016

     View Summary

    The vibrating conditions necessary for induction of the illusion of the metacarpophalangeal joint of index finger flex movement and the perceptual properties of the illusion itself were investigated in this study. The experimental factors were vibration frequencies of 50, 70, 90, 110, 130, 150, 170 and 190 Hz. Subjects were asked to evaluate the presence or absence of an illusion and its vividness on a 5-point scale. Simultaneously, the perceptual time it took for an illusion to occur from beginning vibration and the maximum illusory angle were measured. It was found that the occurrence rates and the vividness of the illusions were highest at the vibration frequencies of 70, 90, 110, and 130 Hz. The response time was about 5 seconds, and the maximum illusory angle was approximately 40 degrees. These findings could potentially be useful in developing a new interface device using kinesthetic sensation.

    CiNii

  • The relation between different fingers pressing elastic objects and the characteristics of hardness discriminability

    TANAKA Mizuho, UMESAWA Yumi, DOI Kouki, FUJIMOTO Hiroshi

    Transactions of the JSME (in Japanese)   82 ( 838 ) 16 - 00001-16-00001  2016

     View Summary

    Identification of the hardness of an object in a human hand is different according to the hardness of the object. For example, chiropractors identify stiffness in the muscle by using their thumb, which can press more forcefully than the forefinger. However, it has not been shown experimentally if the characteristics of hardness discriminability are different according to fingers. In this study, to clarify the relation between different fingers pressing elastic objects and the characteristics of hardness discriminability, we investigated the differential threshold of hardness using the forefinger and thumb. Additionally, the influence of press force and press displacement on the characteristics of hardness discriminability was clarified. We used 7 elastic test pieces with different Young's moduli as the presented stimuli. We also used the test pieces with hardness sensation judged as 'hard' in our previous research. We conducted the experiment using the constant stimuli method to calculate differential threshold of hardness as one evaluation index of hardness discriminability when using the forefinger and thumb. The results of this experiment showed that the hardness discriminability of the thumb was better than that of the forefinger. In addition, these results suggested that press displacement but not press force should be used to estimate the hardness discriminability and that the thumb is better than the forefinger to discriminate the displacement. These findings clarify the mechanism underlying hardness discriminability in the human hand.

    CiNii

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Books and Other Publications 【 display / non-display

  • 機械工学便覧 応用システム編(医療・福祉・バイオ機器)

    丸善(日本機械学会編)  2008.08

  • バリアフリーのための福祉技術入門

    オーム社  1998.09

  • 関節モーメントによる歩行分析

    医歯薬出版  1997.07

Industrial Property Rights 【 display / non-display

  • 足具の底部構造

    藤本 浩志, 高嶋 孝倫, 高西 淳夫

    Patent

  • カーソル移動制御装置

    藤本 浩志, 山崎 健太郎

    Patent

Other 【 display / non-display

  • 人間科学部だからとい...

     View Summary

    人間科学部だからという訳ではありませんが,『ヒト』は汲めども尽きぬ奥深い研究対象だと考えています.主体である『ヒト自身』と,それを取り巻く『周辺環境(モノだけではなく他者や他者群も含む)』とをそれぞれサブシステムと見なせば,両者が統合されたトータルシステムは『人間・環境システム』と呼ぶことができ,人間に関する諸問題はこの枠組みの中に位置付けることができます.私自身の研究テーマとしては,両サブシステム自体に備わった機能の解明にとどまらず,それらの間のインタラクションを司る『インターフェース』の役割にも大いに注目し,その開発や評価も行っています.

Awards 【 display / non-display

  • 日本人間工学会 研究奨励賞

    2006.06  

Research Projects 【 display / non-display

  • Establishment of Production Method reading Braille Learning Materials with Vocal Guidance Function and Evaluation of their Usability

    Project Year :

    2019.04
    -
    2023.03
     

  • Evaluation of Easily Readable Display Method of Concave Dot Stimulation on Tactile Map and Visually Impaired Tactile Reading Action

    Project Year :

    2019.04
    -
    2023.03
     

  • Establishment of display method of tactile guide maps based on human tactile characteristics for standardization of its display method

    Project Year :

    2016.04
    -
    2019.03
     

     View Summary

    In this study, for the purpose of establishing display method of tactile guide maps based on human tactile characteristics for standardization of its display method, we could obtain objective empirical data regarding tactile readability of tactile guide maps. Concretely, we could investigate “Influence of intervals between border line and dot patterns on tactile guide map on its identification”, “Ease of identification of dot lines used in tactile guide maps” and “Relationship between tactile method and angle discrimination of tactile lines”. And also, we were able to provide producers of tactile guide maps such as research collaborators with our findings obtained through this study. In the future, we will try to produce tactile guide maps based on our this knowledge and evaluate the tactile readability to contribute to the spread of the tactile guide map with high tactile readability

  • Clarification of shape and size of tactile symbol based on accesible design

    Project Year :

    2015.04
    -
    2018.03
     

     View Summary

    In this study, list of tactile symbols based on accessible design were created and also easily their identification sizes were examined. Concretely, our research results about examination of original body soup tactile symbol were compiled for providing knowledge that will help in formulating similar tactile standards based on accessible design. A list of practical tactile symbol shapes in consultation with the visually impaired persons was created and their discriminability was evaluated for proposing new tactile symbol in the future. These knowledge will be helpful for discussing display method of new tactile symbol for visually impaired persons

  • The analysis of the role and its brain mechanism of motor imagery in motor skill learning

    Project Year :

    2014.04
    -
    2018.03
     

     View Summary

    Personal difference in the ability of learning of new motor skill, especially that of diffifult action, is big. One of the reason of this is that motor learning involves not only gaining the motor action itself, but also having appropriate motor image of the action. In this research we analyzed brain activities during the process of motor learning under the hypothesis that motor learning is the process of interpretting motor images of objective third-person perspective into the motor images of first-person perspective. As results, it was suggested that at the initial stage of learning third-person perspective images are dominant and strongly related to the quality of motor performance, and as the learning progresses, first-person person perspective images become dominant

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Specific Research 【 display / non-display

  • 脳卒中片麻痺患者の感覚運動野の活性化を目指した運動錯覚現象のリハビリ応用への挑戦

    2018  

     View Summary

     四肢の関節運動に関わる筋肉の腱への振動提示により,関節が動くように感じる錯覚が生起する.本研究では,昨年度に引き続き,以下の課題を目的として研究を行った. (1) 前年度に開発した刺激位置固定方法の簡易化のための機構をさらに改良する. (2) 適用事例を継続的に増やしことによって,効果の評価を行う. 改良した装置を使用し,前腕屈筋の腱に振動刺激を提示し,手首伸展錯覚を生起の有無を確認した.その結果,実験参加者は自分で手首部分を装置の適切な位置に設置できるようになった.また錯覚生起率はほぼ100%,明瞭度と痛みも妥当な範囲に収まり,開発した装置によって明瞭な手首伸展運動錯覚が生起することが確認できた.

  • 脳卒中片麻痺患者の感覚運動野の活性化を目指した運動錯覚現象のリハビリ応用への挑戦

    2017  

     View Summary

     四肢の関節運動に関わる筋肉の腱への振動提示により,関節が動くように感じる錯覚が生起する.本研究では,以下の課題を目的として研究を行った.(1)手首で錯覚生起可能な低負荷の刺激提示の方法を明らかにする.(2)刺激位置固定方法の簡易化および自動化のための機構を開発する. 開発した装置を使用し,手首伸展運動錯覚の生起を確認した.実験参加者には右前腕を装置に置いてもらい,前腕屈筋の腱に振動刺激を提示し,手首伸展錯覚を生起の有無を確認した.その結果,錯覚生起率はほぼ100%,明瞭度と痛みも妥当な範囲に収まり,開発した装置を用いて高い生起率で明瞭な手首伸展運動錯覚が生起することが確認できた.

  • 主成分分析によるロコモーティブシンドロームに関する歩行特徴の分析

    2015  

     View Summary

     ロコモティブシンドロームとは,「運動器の障害により要介護になるリスクの高い状態になること」と定義され,健康寿命の延伸を目指して2007年に日本整形外科学会が提唱した新しい概念である.現在,ロコモティブシンドロームの評価は,身体の痛みや日常生活に関わる25項目の設問によって構成されるロコモ25と呼ばれる質問紙によって得点化され,その得点に閾値を定めることでロコモティブシンドロームの判定が行われている.これらの現状を踏まえて,個人ごとに客観的なデータに基づいたロコモティブシンドロームの評価が可能な手法の実現を目指した.本研究では判定に有効な定量的な指標の抽出を行い,有効性を検証した.

  • 層構造を成す対象物に対するヒト皮膚感覚の硬さ弁別特性の評価とその応用

    2009  

     View Summary

     本研究室では,硬さ(ヤング率)の異なる弾性対象物(直径50mm,厚さ30mmの円柱形状)を多数製作し,それらを呈示刺激として,指腹で押し込んだ際の硬さ感覚特性を定量的に評価してきた.これらの成果を踏まえ,新たに,異なるヤング率の対象物を重ねた硬軟二層構造体の場合の硬さ感覚特性を系列カテゴリ法により定量的に評価することを目的とした. 呈示刺激は,7種類のヤング率の弾性体を4種類の厚さ(各々5,10,15,25mm)で作製し,上層5mm下層25mm(厚さ比1:5),あるいは上層10mm下層20mm(厚さ比1:2)になるよう組み合わせ呈示した.これを被験者は呈示刺激の中心を一度だけ人差し指の指腹で押し込み,その際に感じたままの硬さの感覚に相当するカテゴリ(「極端に軟らかい」「かなり軟らかい」「やや軟らかい」「どちらでもない」「やや硬い」「かなり硬い」「極端に硬い」の7 段階)で硬さ感覚を回答した.なお,本研究は本学研究倫理審査委員会の承認を得て行った. 各刺激に対する硬さ感覚に相当するカテゴリの割合を反応率とし,それを基に硬さ感覚の尺度値を導出した.実験の結果,上層の厚さが薄い場合には,上層のヤング率に対して下層のヤング率の違いが硬さ感覚特性に及ぼす影響が強くなることがわかった.特に上層の厚さが薄い5mmの場合には,上層のヤング率が異なっても同様の硬さ感覚特性の傾向が見られた.上層の厚さ10mmの場合には,下層のヤング率が硬さ感覚に及ぼす影響が限定的になり,上層が硬くも軟らかくも無いヤング率の場合には,下層のヤング率の影響を受けることがわかった.上層の厚さが15mm(厚さ比1:1)の場合には更に限定的で,上層のヤング率が7種類の内の中央の場合のみにおいて顕著に下層のヤング率の影響を受けることがわかった.以上の結果より,上層の厚さによらず下層のヤング率が硬さ感覚特性により強く影響を及ぼすような,上層のヤング率の範囲が存在することが示された.これは,この付近の硬さが指先で硬さを弁別しやすい領域にあるためだと考えられる.

  • 点字の属性が読みやすさに与える影響に関する研究

    2004  

     View Summary

     視覚障害者にとっては,点字は最も一般的な情報メディアである.従来は基本的に紙を押し出して突起とした点字が主流だったが,近年は樹脂や金属等の様々な材料を用いた点字の技術開発が進んでいる.とりわけ紫外線硬化樹脂インクを用いたスクリーン印刷による点字の場合には,多様な対象物に印刷可能で形状パターンの変更が容易であり,さらに無色透明で製品の外観や下地の墨字印刷に大きな影響を与えないためユニバーサルデザインの観点からも,様々な対象物に印刷され急速に普及しつつある.しかしながら触読しやすさがどのような特徴に影響を受けるのかに関する研究がほとんど無かった.そこで本研究では,紫外線硬化樹脂製インクによる点字(以下,UV点字)の形状に関する特徴が読みやすさに及ぼす影響を定量的に評価することを目的として,実験を行った. 点字の形状特徴は,点の高さ,間隔で規定される.そこでこれらの特徴を任意に備えた点字を作成できる装置を開発した.点間隔はスクリーン(以下,版)に開ける穴の間隔でコントロールできる.他方,高さは版の厚さと穴の大きさ(直径)によって決まることを確認し,様々な直径の穴が開いた版を作成して刷り上がる点の高さとの関係を明らかにした.ある程度以上の高さの点を作成するために,二度塗りや三度塗りの印刷手法を確立した.また印刷したUV点字の形状を計測するために,非接触型のレーザー変位センサを用いた3次元形状を計測できるシステムを開発した.この方法によって実験に供し得る任意の間隔や高さのUV点字の印刷および確認ができるようになった. さらに,これら点の間隔や高さを任意に組み合わせて様々な形状パターンの点字を用いて識別実験を行い,読みやすい条件を検討した.この実験の結果,点間隔については2.9mm,点の高さについては0.4mmあれば十分に確信を持って識別可能であることがわかった.

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Syllabus 【 display / non-display

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