Potential landscapes reveal spatiotemporal structure in urban mobility: Hodge decomposition and principal component analysis of Tokyo before and during COVID-19.

Takaaki Aoki

Yunhan Du Takaaki Aoki Naoya Fujiwara Potential landscapes reveal spatiotemporal structure in urban mobility: Hodge decomposition and principal component analysis of Tokyo before and during COVID-19. 2026 May 28 9 J. Comput. Soc. Sci. 2 https://doi.org/10.1007/s42001-025-00454-z db/journals/jocss/jocss9.html#DuAF26 streams/journals/jocss

Yasuyuki Minamiyama Ui Ikeuchi Kosuke Tanabe Kenji Yuki Kazuhiro Hayashi Takaaki Aoki Maturity Model for Organizational Research Data Management Services. 18 2025 24 Data Sci. J. https://doi.org/10.5334/dsj-2025-018 db/journals/datascience/datascience24.html#MinamiyamaITYHA25 streams/journals/datascience

Yunhan Du Takaaki Aoki Naoya Fujiwara A review of human mobility: Linking data, models, and real-world applications. 90 2025 November 8 J. Comput. Soc. Sci. 4 https://doi.org/10.1007/s42001-025-00414-7 db/journals/jocss/jocss8.html#DuAF25 streams/journals/jocss

Yunhan Du Takaaki Aoki Naoya Fujiwara Two-step dimensionality reduction of human mobility data: From potential landscapes to spatiotemporal insights. 2025 May abs/2505.20929 CoRR https://doi.org/10.48550/arXiv.2505.20929 db/journals/corr/corr2505.html#abs-2505-20929 streams/journals/corr

Masahito Nose Atsuki Shinbori Yoshizumi Miyoshi Tomoaki Hori Tsukasa Ohira Junko Hashiba Chizuko Naoe Rui Gakiya Maiko Okamoto Takeshi Sagara Takaaki Aoki Shigeki Matsubara Ichiro Takahashi Hidekazu Hayashi Kazunari Yamada Yasuyuki Minamiyama Yoshimasa Tanaka Shuji Abe Satoru UeNo Shun Imajo Yasuo Saito Takuya Ashikita Yuko Hori Toshiyuki Shimizu Nanako Okamura Kaoru Hirano Lee Bargatze Enhancing Findability and Searchability of Research Data: Metadata Conversion and Registration in Institutional Repositories. 2024 23 Data Sci. J. https://doi.org/10.5334/dsj-2024-040 db/journals/datascience/datascience23.html#NoseSMHOHNGOSAMTHYMTAUI24 streams/journals/datascience

Masahiro Yoshihara Yuta Ishii Taku Itami Jun Yoneyama Takaaki Aoki Effects of Insole-Type Device with Controllable Ankle Joint Angle on the Peroneus Longus Muscle During Foot Stomping Motion. 1746-1751 2024 BioRob https://doi.org/10.1109/BioRob60516.2024.10719942 conf/biorob/2024 db/conf/biorob/biorob2024.html#YoshiharaIIYA24 streams/conf/biorob Ryuichi Hirota Yuta Ishii Masahiro Yoshihara Taku Itami Masakatsu Iwase Yoichi Oi Koji Ebisu Takaaki Aoki Insole-Type Walking Support Device Equipped with a Control Method to Eliminate Rattling. 669-674 2024 Humanoids https://doi.org/10.1109/Humanoids58906.2024.10769824 conf/humanoids/2024 db/conf/humanoids/humanoids2024.html#HirotaIYIIOEA24 Yuta Ishii Kazuki Date Taku Itami Jun Yoneyama Naruki Matsui Nobuyuki Shinoda Takaaki Aoki Shoe-Type Walking Assist Device with Controllable Subtalar Joint Alignment at Heel Contact. 1-6 2023 ICORR https://doi.org/10.1109/ICORR58425.2023.10304713 conf/icorr/2023 db/conf/icorr/icorr2023.html#IshiiDIYMSA23 Taku Itami Kazuki Date Yuta Ishii Jun Yoneyama Takaaki Aoki Insole-Type Walking Assist Device Capable of Inducing Inversion-Eversion of the Ankle Angle to the Neutral Position. 137-142 2023 IROS https://doi.org/10.1109/IROS55552.2023.10342205 db/conf/iros/iros2023.html#ItamiDIYA23 Ryuichi Hirota Taku Itami Jun Yoneyama Takaaki Aoki Dynamic Inversion/Eversion of the Ankle Angle Measurement Device with Inertial Sensor and Ultrasound Echo. 1-6 2023 ROBIO https://doi.org/10.1109/ROBIO58561.2023.10354749 conf/robio/2023 db/conf/robio/robio2023.html#HirotaIYA23 Toshihiko Iyemori Takaaki Aoki Shoji Kajita Tamaki Motoki Tomoko Kawaguchi Eriko Amano A Campus-wide Survey of Consciousness on Research Datasets. 312-315 2020 IIAI-AAI https://doi.org/10.1109/IIAI-AAI50415.2020.00070 conf/iiaiaai/2020 db/conf/iiaiaai/iiaiaai2020.html#IyemoriAKMKA20

Tatsuro Kawamoto Takaaki Aoki Michiko Ueda Graph-based open-ended survey on concerns related to COVID-19. 2020 abs/2012.04510 CoRR https://arxiv.org/abs/2012.04510 db/journals/corr/corr2012.html#abs-2012-04510

Tatsuro Kawamoto Takaaki Aoki Democratic classification of free-format survey responses with a network-based framework. 322-327 2019 1 Nat. Mach. Intell. 7 https://doi.org/10.1038/s42256-019-0071-y db/journals/natmi/natmi1.html#KawamotoA19

Tatsuro Kawamoto Takaaki Aoki Author Correction: Democratic classification of free-format survey responses with a network-based framework. 382 2019 1 Nat. Mach. Intell. 8 https://doi.org/10.1038/s42256-019-0079-3 https://www.wikidata.org/entity/Q127454189 db/journals/natmi/natmi1.html#KawamotoA19a

Tatsuro Kawamoto Takaaki Aoki Publisher Correction: Democratic classification of free-format survey responses with a network-based framework. 383 2019 1 Nat. Mach. Intell. 8 https://doi.org/10.1038/s42256-019-0090-8 db/journals/natmi/natmi1.html#KawamotoA19b

Taku Itami Ken'ichi Yano Ichidai Mori Kazuhiro Kameda Takaaki Aoki Naruki Matsui Masanori Sugawara Nobuyuki Shinoda Norio Hayashi Mechanical Orthosis with Rotation Induction to Lower Leg for Patients with Knee Osteoarthritis. 1-6 2019 ICORR https://doi.org/10.1109/ICORR.2019.8779506 https://www.wikidata.org/entity/Q92371087 conf/icorr/2019 db/conf/icorr/icorr2019.html#ItamiYMKAMSSH19 Takaaki Aoki Shoji Kajita Tamaki Motoki Toshihiko Iyemori Tomoko Kawaguchi Promoting Common Understanding on Research Data Management using Rubric. 387-390 2019 IIAI-AAI https://doi.org/10.1109/IIAI-AAI.2019.00085 https://www.wikidata.org/entity/Q106196155 conf/iiaiaai/2019 db/conf/iiaiaai/iiaiaai2019.html#AokiKMIK19

Tatsuro Kawamoto Takaaki Aoki Democratic summary of public opinions in free-response surveys. 2019 abs/1907.04359 CoRR http://arxiv.org/abs/1907.04359 db/journals/corr/corr1907.html#abs-1907-04359

Taku Itami Ken'ichi Yano Ichidai Mori Kazuhiro Kameda Takaaki Aoki Toshitsugu Kishida Norio Hayashi Naruki Matsui Masanori Sugawara Nobuyuki Shinoda Walking Support Orthosis with an Lower Thigh Rotation Mechanism for Patients with Knee Osteoarthritis. 448-453 2018 AIM https://doi.org/10.1109/AIM.2018.8452335 conf/aimech/2018 db/conf/aimech/aim2018.html#ItamiYMKAKHMSS18 Takaaki Aoki Shoji Kajita Hirokazu Akasaka Hagane Takeda Development and Deployment of Research Data Preservation Policy at a Japanese Research University in 2016. 120-123 2017 IIAI-AAI https://doi.org/10.1109/IIAI-AAI.2017.129 https://doi.ieeecomputersociety.org/10.1109/IIAI-AAI.2017.129 conf/iiaiaai/2017 db/conf/iiaiaai/iiaiaai2017.html#AokiKAT17 Yuta Ieki Taku Itami Ken'ichi Yano Yasuyuki Kobayashi Ryo Yamamoto Takaaki Aoki Yutaka Nishimoto Angle of elbow joint control to exert maximum Torque in an upper limb operation-assisting robot. 1065-1070 2017 MED https://doi.org/10.1109/MED.2017.7984259 conf/med/2017 db/conf/med/med2017.html#IekiIYKYAN17 Taku Itami Toshihito Yabunaka Ken'ichi Yano Yasuyuki Kobayashi Takaaki Aoki Yutaka Nishimoto Development of Self Support Device and Control for Operating the Wheelchair for Upper Limb Disabled Persons. 466-471 2016 ICINCO (2) https://doi.org/10.5220/0005990404660471 conf/icinco/2016-2 db/conf/icinco/icinco2016-2.html#ItamiYYKAN16

Takaaki Aoki Taro Takaguchi Ryota Kobayashi Renaud Lambiotte Input-output relationship in social communications characterized by spike train analysis. 2016 abs/1603.08144 CoRR http://arxiv.org/abs/1603.08144 db/journals/corr/corr1603.html#AokiTKL16

Takaaki Aoki Self-organization of a recurrent network under ongoing synaptic plasticity. 11-19 2015 62 Neural Networks https://doi.org/10.1016/j.neunet.2014.05.024 https://www.wikidata.org/entity/Q51075830 db/journals/nn/nn62.html#Aoki15

Keiji Miura Takaaki Aoki Hodge-Kodaira decomposition of evolving neural networks. 20-24 2015 62 Neural Networks https://doi.org/10.1016/j.neunet.2014.05.021 https://www.wikidata.org/entity/Q48700251 db/journals/nn/nn62.html#MiuraA15

Shogo Tominaga Hiroyuki Nakamura Naoto Mizutani Ryota Sakamoto Ken'ichi Yano Takaaki Aoki Yutaka Nishimoto Elbow joint motion support for C4 level cervical cord injury patient using an exoskeleton robot. 4979-4984 2015 ICRA https://doi.org/10.1109/ICRA.2015.7139891 conf/icra/2015 db/conf/icra/icra2015.html#TominagaNMSYAN15 Shogo Tominaga Norihiko Kato Ken'ichi Yano Yasuyuki Kobayashi Takaaki Aoki Yutaka Nishimoto Decompression motion support for the prevention of pressure ulcers using exoskeleton robot. RAM:7-12 2015 RAM/CIS https://doi.org/10.1109/ICCIS.2015.7274588 conf/ram/2015 db/conf/ram/ram2015.html#TominagaKYKAN15

Takaaki Aoki Luis E. C. Rocha Thilo Gross Temporal and structural heterogeneities emerging in adaptive temporal networks. 2015 abs/1510.00217 CoRR http://arxiv.org/abs/1510.00217 db/journals/corr/corr1510.html#AokiRG15

Toshihito Yabunaka Keishi Yonezawa Norihiko Kato Ken'ichi Yano Yasuyuki Kobayashi Takaaki Aoki Yutaka Nishimoto A wheelchair operation with an exoskeletal robot using user's residual function. 1-2 2014 MHS https://doi.org/10.1109/MHS.2014.7006076 conf/mhs/2014 db/conf/mhs/mhs2014.html#YabunakaYKYKAN14 Naoto Mizutani Michi Yamane Norihiko Kato Ken'ichi Yano Takaaki Aoki Yutaka Nishimoto Yasuyuki Kobayashi Control of wearable motion assist robot for upper limb based on the equilibrium position estimation. 334-337 2013 EMBC https://doi.org/10.1109/EMBC.2013.6609505 https://www.wikidata.org/entity/Q51155190 conf/embc/2013 db/conf/embc/embc2013.html#MizutaniYKYANK13 Naoto Mizutani Tatsuya Watanabe Ken'ichi Yano Takaaki Aoki Yutaka Nishimoto Yasuyuki Kobayashi A wheelchair operation assistance control for a wearable robot using the user's residual function. 1-6 2013 ICORR https://doi.org/10.1109/ICORR.2013.6650465 https://www.wikidata.org/entity/Q51145346 conf/icorr/2013 db/conf/icorr/icorr2013.html#MizutaniWYANK13 Keishi Yonezawa Naoto Mizutani Norihiko Kato Ken'ichi Yano Takaaki Aoki Yasuyuki Kobayashi Yutaka Nishimoto Extension Force Control Considering Contact with an Object Using a Wearable Robot for an Upper Limb. 3555-3560 2013 SMC https://doi.org/10.1109/SMC.2013.606 conf/smc/2013 db/conf/smc/smc2013.html#YonezawaMKYAKN13 Eiichi Ohara Tatsuya Watanabe Takeshi Oishi Takaaki Aoki Yutaka Nishimoto Ken'ichi Yano Assistance control of wheelchair operation using active cast for the upper limb. 2223-2228 2011 ICRA https://doi.org/10.1109/ICRA.2011.5979959 conf/icra/2011 db/conf/icra/icra2011.html#OharaWOANY11 Tatsuya Watanabe Ken'ichi Yano Takaaki Aoki Yutaka Nishimoto Extension motion assistance for upper limb using Proxy-Based Sliding Mode Control. 2885-2890 2011 SMC https://doi.org/10.1109/ICSMC.2011.6084103 conf/smc/2011 db/conf/smc/smc2011.html#WatanabeYAN11 Takaaki Aoki Daisuke Ninomiya Arnoldo José Müller Molina Takeshi Shinohara Accelerating Video Identification by Skipping Queries with a Compact Metric Cache. 252-262 2010 ICCSA (4) https://doi.org/10.1007/978-3-642-12189-0_22 conf/iccsa/2010-4 db/conf/iccsa/iccsa2010-4.html#AokiNMS10 Eiichi Ohara Ken'ichi Yano Satoshi Horihata Takaaki Aoki Yutaka Nishimoto Development of tremor-suppression filter for meal-assist robot. 238-243 2009 WHC https://doi.org/10.1109/WHC.2009.4810802 https://doi.ieeecomputersociety.org/10.1109/WHC.2009.4810802 conf/haptics/2009 db/conf/haptics/whc2009.html#OharaYHAN09 Tetsuya Mouri Haruhisa Kawasaki Takaaki Aoki Yutaka Nishimoto Satoshi Ito Satoshi Ueki Telerehabilitation for Fingers and Wrist Using a Hand Rehabilitation Support System and Robot Hand. 603-608 2009 SyRoCo https://doi.org/10.3182/20090909-4-JP-2010.00102 conf/syroco/2009 db/conf/syroco/syroco2009.html#MouriKANIU09

Tetsuya Mouri Haruhisa Kawasaki Yutaka Nishimoto Takaaki Aoki Yasuhiko Ishigure Makoto Tanahashi Robot Hand Imitating Disabled Person for Education/Training of Rehabilitation. 280-288 2008 20 J. Robotics Mechatronics 2 https://doi.org/10.20965/jrm.2008.p0280 db/journals/jrm/jrm20.html#MouriKNAIT08

Takaaki Aoki Toshio Aoyagi Synchrony-Induced Attractor Transition in Cortical Neural Networks Organized by Spike-Timing Dependent Plasticity. 409-415 2007 19 J. Robotics Mechatronics 4 https://doi.org/10.20965/jrm.2007.p0409 db/journals/jrm/jrm19.html#AokiA07

Takaaki Aoki Toshio Aoyagi Self-Organizing Maps with Asymmetric Neighborhood Function. 2515-2535 2007 19 Neural Comput. 9 https://doi.org/10.1162/neco.2007.19.9.2515 https://www.wikidata.org/entity/Q51909890 db/journals/neco/neco19.html#AokiA07

Takaaki Aoki Toshio Aoyagi Synchrony-Induced Switching Behavior of Spike Pattern Attractors Created by Spike-Timing-Dependent Plasticity. 2720-2738 2007 19 Neural Comput. 10 https://doi.org/10.1162/neco.2007.19.10.2720 https://www.wikidata.org/entity/Q51907375 db/journals/neco/neco19.html#AokiA07a

Takaaki Aoki Kaiichiro Ota Koji Kurata Toshio Aoyagi Ordering Process of Self-Organizing Maps Improved by Asymmetric Neighborhood Function. 426-435 2007 ICONIP (1) https://doi.org/10.1007/978-3-540-69158-7_45 conf/iconip/2007-1 db/conf/iconip/iconip2007-1.html#AokiOKA07 Tetsuya Mouri Haruhisa Kawasaki Yutaka Nishimoto Takaaki Aoki Yasuhiko Ishigure Development of robot hand for therapist education/training on rehabilitation. 2295-2300 2007 IROS https://doi.org/10.1109/IROS.2007.4399377 conf/iros/2007 db/conf/iros/iros2007.html#MouriKNAI07

Toshio Aoyagi Takaaki Aoki Possible role of synchronous input spike trains in controlling the function of neural networks. 259-264 2004 58-60 Neurocomputing https://doi.org/10.1016/j.neucom.2004.01.053 db/journals/ijon/ijon58.html#AoyagiA04

Shuji Abe Hirokazu Akasaka Eriko Amano Toshio Aoyagi Takuya Ashikita Lee Bargatze Kazuki Date Yunhan Du Koji Ebisu Naoya Fujiwara Rui Gakiya Thilo Gross Junko Hashiba Hidekazu Hayashi Kazuhiro Hayashi Norio Hayashi Kaoru Hirano Ryuichi Hirota Tomoaki Hori Yuko Hori Satoshi Horihata Yuta Ieki Ui Ikeuchi Shun Imajo Yasuhiko Ishigure Yuta Ishii Taku Itami Satoshi Ito Masakatsu Iwase Toshihiko Iyemori Shoji Kajita Kazuhiro Kameda Norihiko Kato Tomoko Kawaguchi Tatsuro Kawamoto Haruhisa Kawasaki Toshitsugu Kishida Ryota Kobayashi Yasuyuki Kobayashi Koji Kurata Renaud Lambiotte Shigeki Matsubara Naruki Matsui Yasuyuki Minamiyama Keiji Miura Yoshizumi Miyoshi Naoto Mizutani Arnoldo José Müller Molina Ichidai Mori Tamaki Motoki Tetsuya Mouri Hiroyuki Nakamura Chizuko Naoe Daisuke Ninomiya Yutaka Nishimoto Masahito Nose Eiichi Ohara Tsukasa Ohira Yoichi Oi Takeshi Oishi Maiko Okamoto Nanako Okamura Kaiichiro Ota Luis Enrique Correa da RochaLuis E. C. Rocha Takeshi Sagara Yasuo Saito Ryota Sakamoto Toshiyuki Shimizu Atsuki Shinbori Nobuyuki Shinoda Takeshi Shinohara Masanori Sugawara Taro Takaguchi Ichiro Takahashi Hagane Takeda Kosuke Tanabe Makoto Tanahashi Yoshimasa Tanaka Shogo Tominaga Michiko Ueda Satoshi Ueki Satoru UeNo Tatsuya Watanabe Toshihito Yabunaka Kazunari Yamada Ryo Yamamoto Michi Yamane Ken'ichi Yano Jun Yoneyama Keishi Yonezawa Masahiro Yoshihara Kenji Yuki