Aoyama Toshiyuki 青山敏之

Researcher Number	30516571
Other IDs	https://orcid.org/0000-0002-4658-4457
Affiliation (Current)	2025: 茨城県立医療大学, 保健医療学部, 准教授
Affiliation (based on the past Project Information) *help	2020 – 2023: 茨城県立医療大学, 保健医療学部, 准教授 2016 – 2019: 茨城県立医療大学, 保健医療学部, 助教
Review Section/Research Field	Principal Investigator Basic Section 59020:Sports sciences-related / Basic Section 59010:Rehabilitation science-related / Rehabilitation science/Welfare engineering Except Principal Investigator Basic Section 52020:Neurology-related
Keywords	Principal Investigator 運動観察 / 運動イメージ想起 / 経頭蓋磁気刺激 / 筋活動 / 脳活動 / スポーツ / 動作解析 / 筋シナジー / 送球イップス / クラスター解析 … More / 筋シナジー解析 / 筋電図 / 野球 / イップス / 運動学習 / 皮質脊髄路興奮性 / プラトー / 運動スキル / 経頭蓋直流電気刺激 / 抑制性神経回路 / 抑制性神経機構 / F波 / フォーカルハンドジストニア / 抑制性神経活動 … More Except Principal Investigator ロボティクス / 筋シナジー解析 / 廃用 / 体組成分析 / リハビリテーション / パーキンソン病 Less

Research for a science-based rehabilitation program in Parkinson's disease
- Principal Investigator
  
  河野豊
- Project Period (FY)
  2023 – 2027
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 52020:Neurology-related
- Research Institution
  Ibaraki Prefectural University of Health Science
スポーツ選手に生じるイップスの運動学的・神経生理学的分類の確立Principal Investigator
- Principal Investigator
  
  青山敏之
- Project Period (FY)
  2022 – 2024
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 59020:Sports sciences-related
- Research Institution
  Ibaraki Prefectural University of Health Science
Development of a motor imagery strategy to improve motor skills that have reached a plateau and elucidation of its mechanismPrincipal Investigator
- Principal Investigator
  
  Aoyama Toshiyuki
- Project Period (FY)
  2019 – 2022
- Research Category
  
  Grant-in-Aid for Early-Career Scientists
- Review Section
  
  Basic Section 59010:Rehabilitation science-related
- Research Institution
  Ibaraki Prefectural University of Health Science
Development of rehabilitation technique to induce inhibitory neural activity in patients with focal hand dystoniaPrincipal Investigator
- Principal Investigator
  
  Aoyama Toshiyuki
- Project Period (FY)
  2016 – 2018
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Rehabilitation science/Welfare engineering
- Research Institution
  Ibaraki Prefectural University of Health Science

All 2024 2023 2022 2021 2020 2019 2018 2017 2016

All Journal Article Presentation

[Journal Article] Spatiotemporal patterns of throwing muscle synergies in yips-affected baseball players2024
- Author(s)
  Aoyama Toshiyuki、Ae Kazumichi、Taguchi Takahiro、Kawamori Yuna、Sasaki Daisuke、Kawamura Takashi、Kohno Yutaka
- Journal Title
  
  Scientific Reports
  
  Volume: 14 Issue: 1 Pages: 2649-2649
- DOI
  10.1038/s41598-024-52332-9
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-22K11606
[Journal Article] Simulating Knee-Stress Distribution Using a Computed Tomography-Based Finite Element Model: A Case Study2023
- Author(s)
  Watanabe Kunihiro、Mutsuzaki Hirotaka、Fukaya Takashi、Aoyama Toshiyuki、Nakajima Syuichi、Sekine Norio、Mori Koichi
- Journal Title
  
  Journal of Functional Morphology and Kinesiology
  
  Volume: 8 Issue: 1 Pages: 15-15
- DOI
  10.3390/jfmk8010015
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-22K11606, KAKENHI-PROJECT-19K19873
[Journal Article] Motor imagery ability in baseball players with throwing yips2023
- Author(s)
  Aoyama Toshiyuki、Ae Kazumichi、Soma Hiroto、Miyata Kazuhiro、Kajita Kazuhiro、Kawamura Takashi
- Journal Title
  
  PLOS ONE
  
  Volume: 18 Issue: 11 Pages: e0292632-e0292632
- DOI
  10.1371/journal.pone.0292632
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-22K11606
[Journal Article] Interindividual differences in upper limb muscle synergies during baseball throwing motion in male college baseball players2022
- Author(s)
  Aoyama Toshiyuki、Ae Kazumichi、Kohno Yutaka
- Journal Title
  
  Journal of Biomechanics
  
  Volume: 145 Pages: 111384-111384
- DOI
  10.1016/j.jbiomech.2022.111384
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22K11606, KAKENHI-PROJECT-19K19873
[Journal Article] Differences in motor unit firing properties of the vastus lateralis muscle during postural and voluntary tasks2022
- Author(s)
  Aoyama Toshiyuki、Kohno Yutaka
- Journal Title
  
  Frontiers in Physiology
  
  Volume: 13 Pages: 955912-955912
- DOI
  10.3389/fphys.2022.955912
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-22K11606, KAKENHI-PROJECT-19K19873
[Journal Article] Effectiveness of a case-based digital learning interprofessional workshop involving undergraduates in medical technology, radiological science, and physical therapy: A pre?post intervention study2022
- Author(s)
  Miyata Kazuhiro、Aita Yuichi、Nakajima Syuichi、Sekimoto Michiharu、Setaka Yukako、Tagoya Yoshika、Aoyama Toshiyuki、Maeno Takami、Monma Masahiko、Tomita Kazuhide、Ninomiya Haruhiko
- Journal Title
  
  PLOS ONE
  
  Volume: 17 Issue: 7 Pages: e0270864-e0270864
- DOI
  10.1371/journal.pone.0270864
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-22K11606, KAKENHI-PROJECT-22K11851, KAKENHI-PROJECT-19K19873
[Journal Article] Gait Training after Stroke with a Wearable Robotic Device: A Case Report of Further Improvements in Walking Ability after a Recovery Plateau2021
- Author(s)
  Ishibashi Kiyoshige、Yoshikawa Kenichi、Koseki Kazunori、Aoyama Toshiyuki、Ishii Daisuke、Yamamoto Satoshi、Matsuda Tomoyuki、Tomita Kazuhide、Mutsuzaki Hirotaka、Kohno Yutaka
- Journal Title
  
  Progress in Rehabilitation Medicine
  
  Volume: 6 Issue: 0 Pages: n/a
- DOI
  10.2490/prm.20210037
- NAID
  130008088918
- ISSN
  2432-1354
- Language
  English
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-21H04305, KAKENHI-PROJECT-19K19873
[Journal Article] A Simulation Case Study of Knee Joint Compressive Stress during the Stance Phase in Severe Knee Osteoarthritis Using Finite Element Method2021
- Author(s)
  Takashi Fukaya, Hirotaka Mutsuzaki,Toshiyuki Aoyama, Kunihiro Watanabe,Koichi Mori
- Journal Title
  
  Medicina
  
  Volume: 57 Issue: 6 Pages: 1-10
- DOI
  10.3390/medicina57060550
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-20K11261, KAKENHI-PROJECT-19K19873
[Journal Article] Computed Tomography Finite Element Analysis Model Creation and Stress Distribution of Pig Knee Joints2021
- Author(s)
  Watanabe K , Mutsuzaki H , Fukaya T , Aoyama T , Iwamoto K , Nakajima S , Sekine N , Mori K
- Journal Title
  
  The journal of Japan Academy of Health Sciences
  
  Volume: 24 Pages: 181-190
- NAID
  40022800749
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K19873
[Journal Article] Influence of Visual Stimulation-Induced Passive Reproduction of Motor Images in the Brain on Motor Paralysis After Stroke2021
- Author(s)
  Aoyama Toshiyuki、Kanazawa Atsushi、Kohno Yutaka、Watanabe Shinya、Tomita Kazuhide、Kaneko Fuminari
- Journal Title
  
  Frontiers in Human Neuroscience
  
  Volume: 15
- DOI
  10.3389/fnhum.2021.674139
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19K19873, KAKENHI-PROJECT-19H01088
[Journal Article] A feasibility study of the incidence and symptoms of the throwing yips in college baseball players2021
- Author(s)
  青山敏之, 阿江数通, 相馬寛人, 宮田一弘, 梶田和宏, 奈良隆章, 川村卓
- Journal Title
  
  Japanese Journal of Physical Fitness and Sports Medicine
  
  Volume: 70 Issue: 1 Pages: 91-100
- DOI
  10.7600/jspfsm.70.91
- NAID
  130007967726
- ISSN
  0039-906X, 1881-4751
- Year and Date
  2021-02-01
- Language
  Japanese
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K19873
[Journal Article] Difference in Personality Traits and Symptom Intensity According to the Trigger-Based Classification of Throwing Yips in Baseball Players2021
- Author(s)
  Aoyama Toshiyuki、Ae Kazumichi、Souma Hiroto、Miyata Kazuhiro、Kajita Kazuhiro、Kawamura Takashi、Iwai Koichi
- Journal Title
  
  Frontiers in Sports and Active Living
  
  Volume: 3
- DOI
  10.3389/fspor.2021.652792
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K19873
[Journal Article] Gait Training Using a Wearable Robotic Device for Non-Traumatic Spinal Cord Injury: A Case Report2020
- Author(s)
  Yoshikawa Kenichi、Mutsuzaki Hirotaka、Koseki Kazunori、Endo Yusuke、Hashizume Yuko、Nakazawa Ryo、Aoyama Toshiyuki、Yozu Arito、Kohno Yutaka
- Journal Title
  
  Geriatric Orthopaedic Surgery & Rehabilitation
  
  Volume: 11 Pages: 1-8
- DOI
  10.1177/2151459320956960
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-19K19873, KAKENHI-PROJECT-20H01137
[Journal Article] Gait Training Using a Hip-Wearable Robotic Exoskeleton After Total Knee Arthroplasty: A Case Report2020
- Author(s)
  Koseki Kazunori、Mutsuzaki Hirotaka、Yoshikawa Kenichi、Endo Yusuke、Kanazawa Atsushi、Nakazawa Ryo、Fukaya Takashi、Aoyama Toshiyuki、Kohno Yutaka
- Journal Title
  
  Geriatric Orthopaedic Surgery & Rehabilitation
  
  Volume: 11 Pages: 1-6
- DOI
  10.1177/2151459320966483
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-19K19873, KAKENHI-PROJECT-20H01147
[Journal Article] Development of a Knee Joint CT-FEM Model in Load Response of the Stance Phase During Walking Using Muscle Exertion, Motion Analysis, and Ground Reaction Force Data2020
- Author(s)
  Kunihiro Watanabe, Hirotaka Mutsuzaki, Takashi Fukaya, Toshiyuki Aoyama, Syuichi Nakajima, Norio Sekine, Koichi Mori
- Journal Title
  
  Medicina
  
  Volume: 56 Issue: 2 Pages: 56-56
- DOI
  10.3390/medicina56020056
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-16K01515, KAKENHI-PROJECT-19K19873
[Journal Article] Feasibility Case Study for Treating a Patient with Sensory Ataxia Following a Stroke with Kinesthetic Illusion Induced by Visual Stimulation2020
- Author(s)
  Aoyama Toshiyuki、Kanazawa Atsushi、Kohno Yutaka、Watanabe Shinya、Tomita Kazuhide、Kimura Takehide、Endo Yusuke、Kaneko Fuminari
- Journal Title
  
  Progress in Rehabilitation Medicine
  
  Volume: 5 Issue: 0 Pages: n/a
- DOI
  10.2490/prm.20200025
- NAID
  130007931036
- ISSN
  2432-1354
- Language
  English
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K19873
[Journal Article] Temporal and quantitative variability in muscle electrical activity decreases as dexterous hand motor skills are learned2020
- Author(s)
  Aoyama Toshiyuki、Kohno Yutaka
- Journal Title
  
  PLOS ONE
  
  Volume: 15 Issue: 7 Pages: e0236254-e0236254
- DOI
  10.1371/journal.pone.0236254
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K19873
[Journal Article] Motor imagery combined with action observation training optimized for individual motor skills further improves motor skills close to a plateau2020
- Author(s)
  Aoyama Toshiyuki、Kaneko Fuminari、Kohno Yutaka
- Journal Title
  
  Human Movement Science
  
  Volume: 73 Pages: 102683-102683
- DOI
  10.1016/j.humov.2020.102683
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19K19873
[Journal Article] Neural mechanism of selective finger movement independent of synergistic movement.2019
- Author(s)
  Aoyama Toshiyuki, Kaneko Fuminari , Ohashi Yukari 、Kohno Yutaka
- Journal Title
  
  Experimental Brain Research
  
  Volume: 237 Issue: 12 Pages: 3485-3492
- DOI
  10.1007/s00221-019-05693-x
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-20K20480, KAKENHI-PROJECT-19K19873
[Journal Article] Dissociation between cortical and spinal excitability of the antagonist muscle during combined motor imagery and action observation2019
- Author(s)
  Aoyama Toshiyuki、Kaneko Fuminari、Ohashi Yukari、Kohno Yutaka
- Journal Title
  
  Scientific Reports
  
  Volume: 9 Issue: 1 Pages: 13120-13120
- DOI
  10.1038/s41598-019-49456-8
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-19H01088, KAKENHI-PROJECT-19K19873
[Journal Article] Development of an educational program for interprofessional collaboration: A workshop approach involving undergraduates from multiple departments2019
- Author(s)
  Setaka Y, Tomita K, Aoyama T, Sekimoto M, Aita Y, Ohashi Y, Ninomiya
- Journal Title
  
  Journal of Allied Health Sciences
  
  Volume: 10 Pages: 10-18
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16K16433
[Journal Article] Analysis of reaching movements in stroke patients using average variability of electromyogram value2017
- Author(s)
  Tatsunori Sawada, Fuminari Kaneko, Toshiyuki Aoyama, Masahiro Ogawa, Tsuneji Murakami
- Journal Title
  
  Asian Journal of Occupational Therapy
  
  Volume: 13 Pages: 13-21
- NAID
  130005683111
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16K16433
[Journal Article] Surround inhibition in motor execution and motor imagery2016
- Author(s)
  Aoyama T, Kaneko F, Ohashi Y, Nagata F
- Journal Title
  
  Neurocsi Lett
  
  Volume: 629 Pages: 196-201
- DOI
  10.1016/j.neulet.2016.07.012
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-16K16433
[Journal Article] The association of motor imagery and kinesthetic illusion prolong the effect of transcranial direct current stimulation on corticospinal tract excitability2016
- Author(s)
  Kaneko, F., Shibata, E., Hayami, T., Nagahata, K., Aoyama, T
- Journal Title
  
  Journal of NeuroEngineering and Rehabilitation
  
  Volume: 13 Issue: 1 Pages: 36-43
- DOI
  10.1186/s12984-016-0143-8
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26282157, KAKENHI-PROJECT-16K16433
[Presentation] 歩行速度の変化に伴う下肢筋活動と足部アーチ高との関連について2024
- Author(s)
  川守佑奈，青山敏之
- Organizer
  第10回日本スポーツ理学療法学会学術大会
- Data Source
  KAKENHI-PROJECT-22K11606
[Presentation] 短下肢装具装着が脳卒中片麻痺患者の歩行時筋シナジーに与える影響-シングルケースによる検証-2023
- Author(s)
  狩野大河，青山敏之，吉川憲一，石橋清成，河野豊
- Organizer
  第28回日本基礎理学療法学会学術大会
- Data Source
  KAKENHI-PROJECT-22K11606
[Presentation] 送球イップスを呈する野球選手における筋シナジーの時空間的パターンの特徴2023
- Author(s)
  青山敏之，阿江数通，田口敬大，川守佑奈，佐々木大輔，川村卓，河野豊
- Organizer
  第28回日本基礎理学療法学会学術大会
- Data Source
  KAKENHI-PROJECT-22K11606
[Presentation] 基礎研究から考える運動イメージ想起を用いた介入の適応と方法2022
- Author(s)
  青山敏之
- Organizer
  第27回基礎理学療法学術大会
- Data Source
  KAKENHI-PROJECT-22K11606
[Presentation] 姿勢保持課題と随意運動課題における外側広筋運動単位発火パターンの相違2022
- Author(s)
  青山敏之，河野豊
- Organizer
  第27回基礎理学療法学術大会
- Data Source
  KAKENHI-PROJECT-22K11606
[Presentation] 姿勢保持課題と随意運動課題における外側広筋運動単位発火パターンの相違2022
- Author(s)
  青山敏之，河野豊
- Organizer
  第27回基礎理学療法学術大会
- Data Source
  KAKENHI-PROJECT-19K19873
[Presentation] 基礎研究から考える運動イメージ想起を用いた介入の適応と方法2022
- Author(s)
  青山敏之
- Organizer
  第27回基礎理学療法学術大会
- Data Source
  KAKENHI-PROJECT-19K19873
[Presentation] HONDA歩行アシストを用いた歩行練習により歩行能力の向上を認めた脳卒中片麻痺症例-筋シナジー解析による検討-2021
- Author(s)
  石橋清成、吉川憲一、古関一則、青山敏之、石井大典、山本哲、松田智行、冨田和秀、河野豊
- Organizer
  第60回日本運動障害研究会
- Data Source
  KAKENHI-PROJECT-19K19873
[Presentation] 上肢感覚性運動失調を併発した脳卒中片麻痺患者に対する　視覚誘導性自己運動錯覚の即時効果　～運動学的評価と神経生理学的評価を用いた検証～2018
- Author(s)
  加藤淳史，青山敏之，河野豊，冨田和秀，渡邉信也，遠藤悠介，金子文成
- Organizer
  第23回日本基礎理学療法学会学術大会
- Data Source
  KAKENHI-PROJECT-16K16433
[Presentation] 重度運動麻痺を呈した慢性期脳卒中片麻痺患者の手指機能に対する視覚性自己運動錯覚の即時的効果～経頭蓋磁気刺激を用いた運動機能改善のメカニズムの検証2018
- Author(s)
  加藤淳史, 青山敏之, 河野豊, 冨田和秀, 渡邉信也, 遠藤悠介, 金子文成
- Organizer
  第22回茨城県理学療法士学会
- Data Source
  KAKENHI-PROJECT-16K16433
[Presentation] Stiff Knee Gait を呈した症例における歩行時ハムストリングス筋活動の特徴2017
- Author(s)
  真庭弘樹，青山敏之
- Organizer
  第36回関東甲信越ブロック理学療法士学会（長野）
- Data Source
  KAKENHI-PROJECT-16K16433
[Presentation] 運動イメージ想起によって拮抗筋を支配する皮質・脊髄に生じる興奮性変化2016
- Author(s)
  青山敏之, 金子文成, 大橋ゆかり
- Organizer
  第10回Motor Control研究会
- Place of Presentation
  横浜
- Year and Date
  2016-09-01
- Data Source
  KAKENHI-PROJECT-16K16433
[Presentation] 運動遂行と運動イメージ想起がもたらす皮質脊髄路への抑制性入力の相違2016
- Author(s)
  青山敏之, 金子文成, 大橋ゆかり
- Organizer
  第51回日本理学療法学術大会
- Place of Presentation
  札幌
- Year and Date
  2016-05-27
- Data Source
  KAKENHI-PROJECT-16K16433

1. 河野豊 (10392200)

# of Collaborated Projects: 2 results

# of Collaborated Products: 2 results
2. 山本哲 (00735334)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
3. 石井大典 (30803291)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
4. TOMITA Kazuhide

# of Collaborated Projects: 1 results

# of Collaborated Products: 3 results
5. KANEKO Fuminari

# of Collaborated Projects: 1 results

# of Collaborated Products: 9 results
6. 森浩一

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
7. 六崎裕高

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
8. 深谷隆史

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results

Aoyama Toshiyuki 青山 敏之

Research Projects

Research Products

Co-Researchers

Research for a science-based rehabilitation program in Parkinson's disease

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

スポーツ選手に生じるイップスの運動学的・神経生理学的分類の確立Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Development of a motor imagery strategy to improve motor skills that have reached a plateau and elucidation of its mechanismPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Development of rehabilitation technique to induce inhibitory neural activity in patients with focal hand dystoniaPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

[Journal Article] Spatiotemporal patterns of throwing muscle synergies in yips-affected baseball players2024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Simulating Knee-Stress Distribution Using a Computed Tomography-Based Finite Element Model: A Case Study2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Motor imagery ability in baseball players with throwing yips2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Interindividual differences in upper limb muscle synergies during baseball throwing motion in male college baseball players2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Differences in motor unit firing properties of the vastus lateralis muscle during postural and voluntary tasks2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Effectiveness of a case-based digital learning interprofessional workshop involving undergraduates in medical technology, radiological science, and physical therapy: A pre?post intervention study2022

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Gait Training after Stroke with a Wearable Robotic Device: A Case Report of Further Improvements in Walking Ability after a Recovery Plateau2021

Author(s)

Journal Title

DOI

NAID

ISSN

Language

Data Source

[Journal Article] A Simulation Case Study of Knee Joint Compressive Stress during the Stance Phase in Severe Knee Osteoarthritis Using Finite Element Method2021

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Computed Tomography Finite Element Analysis Model Creation and Stress Distribution of Pig Knee Joints2021

Author(s)

Journal Title

NAID

Data Source

[Journal Article] Influence of Visual Stimulation-Induced Passive Reproduction of Motor Images in the Brain on Motor Paralysis After Stroke2021

Author(s)

Journal Title

DOI

Aoyama Toshiyuki 青山敏之