The University of Osaka Researchers

Katsuya Sakai

坂井勝哉

Katsuya Sakai

坂井勝哉

Graduate School of Engineering，Specially Appointed Associate Professor (Lecturer)(Full Time)

Research History 6

2021/05 - Present

The University of Osaka　Graduate School of Engineering　Specially Appointed Lecturer
2019/02 - 2021/01

National Taiwan University　Department of Civil Engineering　Assistant Professor
2017/04 - 2019/01

Kobe University　Graduate School of Engineering Department of Civil Engineering　Research Associate
2015/10 - 2017/03

Japan Society for the Promotion of Science　Research Fellowship for Young Scientists (PD)
2016/08 - 2016/12

Institute for Transport Studies (ITS) at the University of Leeds, UK hosted by Dr. Ronghui Liu　Visiting Researcher
2015/04 - 2015/09

Japan Society for the Promotion of Science　Research Fellowship for Young Scientists (DC)

Education 1

Tokyo Institute of Technology　Graduate School of Science and Engineering　Department of Civil Engineering

2012/10 - 2015/09

Professional Memberships 2

The Institute of Electrical Engineers of Japan
Japan Society of Civil Engineers

Research Areas 1

Social infrastructure (civil Engineering, architecture, disaster prevention) / Civil engineering (planning and transportation) /

Awards 2

Power Academy Excellent Emerging Research Award, FY2022

Power Academy　2024/03
Gyoboku-kai Award, awarded to the top-ranked student upon graduation

Department of Civil Engineering, Kobe University　2011/03

Papers 13

ENHANCING RESILIENCE TO CASCADING FAILURES VIA EV-BASED RESTORATION IN INTERDEPENDENT URBAN TRANSPORTATION AND POWER NETWORKS

Katsuya Sakai, Hiroki Kamakura, Kashin Sugishita

Proceedings of 29th HKSTS International Conference　2025/12　Research paper (international conference proceedings)
Large-scale spatiotemporal modeling of travel behavior, electric vehicle charging demand, and flexibility based on human mobility big data

Yohei Yamaguchi, Yudai Ochi, Ryotaro Ohara, Hideaki Uchida, Shinya Yoshizawa, Katsuya Sakai, Yutaka Ota, Yoshiyuki Shimoda

Energy　Vol. 335　2025/10　Research paper (scientific journal)
Electric Truck Delivery for Dynamic Pricing, Journal of Japan Society of Energy and Resources

Hiroshi Morita, Chihiro Maeda, Katsuya Sakai, Yutaka Ota, Akihiro Iwata

2025/03
路線バス電動化検討フレームワーク―大阪大学キャンパス間連絡バスを用いた実証実験―

坂井勝哉, 太田豊

電気学会論文誌D（産業応用部門誌）　Vol. 144　No. 7　p. 568-576　2024/07　Research paper (scientific journal)
e-mobility and energy coupled simulation for designing carbon neutral cities and communities

Yutaka Ota, Shinya Yoshizawa, Katsuya Sakai, Yoshinori Ueda, Masaya Takashima, Koji Kagawa, Akihiro Iwata

IATSS Research　Vol. 47　No. 2　p. 270-276　2023/07　Research paper (scientific journal)
Publisher: Elsevier BV
Location problems of vertical evacuation structures for dam-failure floods: Considering shelter-in-place and horizontal evacuation

Min-Ci Sun, Katsuya Sakai, Albert Y. Chen, Yu-Ting Hsu

International Journal of Disaster Risk Reduction　2022/07　Research paper (scientific journal)
Network Aggregation Method using Vehicle Trajectory Data

Shohei Yasuda, Takamasa Iryo, Katsuya Sakai

交通工学論文集(Web)　Vol. 6　No. 2　2020　Research paper (scientific journal)
Data-oriented network aggregation for large-scale network analysis using probe-vehicle trajectories.

Shohei Yasuda, Takamasa Iryo, Katsuya Sakai, Kazuya Fukushima

2019 IEEE Intelligent Transportation Systems Conference(ITSC)　p. 1677-1682　2019　Research paper (international conference proceedings)
Publisher: IEEE
Pareto-improving social optimal pricing schemes based on bottleneck permits for managing congestion at a merging section

Katsuya Sakai, Ronghui Liu, Takahiko Kusakabe, Yasuo Asakura

International Journal of Sustainable Transportation　Vol. 11　No. 10　p. 737-748　2017/11/26　Research paper (scientific journal)
EFFECTS OF TRADABLE BOTTLENECK PERMITS AND PARETO IMPROVEMENT UNDER USERS' HETEROGENEITY IN SCHEDULE FLEXIBILITY AND TOLL RESISTANCE

Katsuya SAKAI, Takahiko KUSAKABE, Yasuo ASAKURA

Journal of Japan Society of Civil Engineers, Ser. D3 (Infrastructure Planning and Management)　Vol. 72　No. 5　p. I_607-I_616　2016
Publisher: Japan Society of Civil Engineers
PARETO IMPROVEMENT BY INTRODUCING TRADABLE BOTTLENECK PERMITS SCHEME IN A MERGING NETWORK

坂井勝哉, 日下部貴彦, 朝倉康夫

土木学会論文集 D3(土木計画学)(Web)　Vol. 71　No. 5　2015
STATISTICAL MODEL OF TRAVEL TIME PREDICTION CORRESPONDING TO FLUCTUATION OF BOTTLENECK CAPACITY ON JUNCTION

坂井勝哉, 日下部貴彦, 朝倉康夫

土木学会論文集 D3(土木計画学)(Web)　Vol. 69　No. 5　2013　Research paper (scientific journal)
STATISTICAL ANALYSIS ON PERFORMANCE OF TRAVEL TIME INTERVAL PREDICTION MODELS

坂井勝哉, 日下部貴彦, WEI Chong, 朝倉康夫

土木学会論文集 D3(土木計画学)(Web)　Vol. 68　No. 5　2012　Research paper (scientific journal)

Misc. 30

Cost-Effectiveness and CO2 Reduction of Commercial EV Adoption Based on GPS Trajectory Data, The International Council on Electrical Engineering (ICEE) Conference, Wuhan

Keiichi Ikeda, Katsuya Sakai

2025/07
Optimization of Locations and Sizes of Charging Stations to Realize Middle-mile EV Logistics, International Symposium on Scheduling, Tokyo

Yuta Tsutsumi, Katsuya Sakai, Hiroshi Morita

2025/06
Generating Individual Trajectories for Synthetic Populations with a Large Language Model, Proceedings of ASim Conference 2024: 5th Asia Conference of IBPSA, 1044-1051, Osaka

Ryotaro Ohara, Hideaki Uchida, Yohei Yamaguchi, Shinya Yoshizawa, Katsuya Sakai, Yoshiyuki Shimoda

2024/12
Spatiotemporal Analysis of Electric Vehicle Charging Demand Based on Trajectory Data

大原涼太郎, 越智雄大, 山口容平, 内田英明, 芳澤信哉, 坂井勝哉, 太田豊, 下田吉之

電気学会全国大会講演論文集(CD-ROM)　Vol. 2024　2024
Equitable Sequence to Restore Transportation Network Links after Extreme Disaster, The 9th International Symposium on Transport Network Resilience (INSTR), Hong Kong

Kenny Chandra WIJAYA, Katsuya SAKAI

2023/12
e-Mobility Digital Twin designing Electric Vehicle, Charging Infrastructure, and Energy System Integration

太田豊, 芳澤信哉, 坂井勝哉, 高嶋正也, 香川公司, 岩田章裕

自動車技術会大会学術講演会講演予稿集(Web)　Vol. 2023　2023
Post-disaster road network recovery plans considering origin-destination connectivity, shortest path length and congestion, The 8th International Symposium on Transport Network Resilience (INSTR), Online

Katsuya Sakai, Kai-Hsuan Wu

2022/06
Energy Consumption Estimation of Electric Buses Operated between Osaka University Campuses

坂井勝哉

生産と技術　Vol. 74　No. 2　2022
Electric Vehicle Trials and Dynamic Simulations toward e-Mobility Digital Twins

太田豊, 芳澤信哉, 坂井勝哉, 上田嘉紀, 高嶋正也, 香川公司, 岩田章裕

電気学会研究会資料(Web)　No. VT-22-010-019/TER-22-065-074　2022
Estimating the running and air conditioning power consumption of electric buses in Osaka University

坂井勝哉, 太田豊

電気学会電力・エネルギー部門大会論文集(Web)　Vol. 2022　2022
Evaluation of Electric Vehicle Power Consumption Estimation Model With Real Driving History Data

芳澤信哉, 坂井勝哉, 太田豊, 上田嘉紀, 香川公司, 岩田章裕

電気学会研究会資料(Web)　No. VT-21-020-028/TER-21-061-069　2021
Departure Time and Parking Choices Equilibrium Model with Macroscopic Fundamental Diagram, The 10th Asian Conference in Regional Science (ACRS), Tsukuba (online)

Pimonwat WANNAPONG, Katsuya SAKAI

2020/10
ANALYSIS ON NETWORK THROUGHPUT REDUCTION WITH TRAVEL TIME INFORMATION PROPAGATION MODEL OF TSUNAMI EVACUATION

坂井勝哉, 口井雅之, 井料隆雅

土木計画学研究・講演集(CD-ROM)　Vol. 61　2020
車両軌跡データを用いたネットワーク集約手法

安田昌平, 井料隆雅, 坂井勝哉

交通工学研究発表会論文集(CD-ROM)　Vol. 39th　2019
ETC2.0車両軌跡データの品質検証のための実走行調査

小山裕大, 坂井勝哉, 安田昌平, 井料隆雅

土木計画学研究・講演集(CD-ROM)　Vol. 57　2018
プローブデータを用いた単路におけるボトルネックの安定性評価

安田昌平, 坂井勝哉, 井料隆雅

土木計画学研究・講演集(CD-ROM)　Vol. 57　2018
観光施設での時間帯別効用を考慮した出発時刻選択均衡モデル

坂井勝哉, 日下部貴彦

土木計画学研究・講演集(CD-ROM)　Vol. 57　2018
INTENTIONAL REMOVALS OF NODES AND LINKS TO AVOID GRIDLOCK

杉下佳辰, 坂井勝哉, 井料隆雅, 朝倉康夫

土木計画学研究・講演集(CD-ROM)　Vol. 57　2018
段階型課金の適用される車線割合が時間帯とともに変化する混雑課金制度-出発時刻選択均衡モデルによる分析-

坂井勝哉, 朝倉康夫

土木計画学研究・講演集(CD-ROM)　Vol. 55　2017
Analysis of tradable bottleneck permits scheme when marginal utility of toll cost changes among drivers

Katsuya Sakai, Takahiko Kusakabe, Yasuo Asakura

18TH EURO WORKING GROUP ON TRANSPORTATION, EWGT 2015　Vol. 10　p. 51-60　2015
ボトルネック通行権取引制度がパレート改善に及ぼす影響-スケジュール制約と料金抵抗の異質性に着目して-

坂井勝哉, 日下部貴彦, 朝倉康夫

土木計画学研究・講演集(CD-ROM)　Vol. 51　2015
Vulnerability Assessment for Cascading Failures in Interdependent Networks, 3rd Symposium of the European Association for Research in Transportation (hEART), Leeds

Kashin SUGISHITA, Katsuya SAKAI, Yasuo ASAKURA

2014/09
Statistical Model for Travel Time Prediction Corresponding to Fluctuation of Bottleneck Capacity, Transport Research Arena, Paris

Katsuya SAKAI, Takahiko KUSAKABE, Yasuo ASAKURA

2014/04
合流ネットワークでのボトルネック通行権取引制度導入時のパレート改善

坂井勝哉, 日下部貴彦, 朝倉康夫

土木計画学研究・講演集(CD-ROM)　Vol. 50　2014
Travel Time Prediction by Bayesian Statistics Approach, International Symposium on Recent Advances in Transport Modelling (OPTIMUM), Kingscliff

Kenichi MEGURO, Katsuya SAKAI, Takahiko KUSAKABE, Yasuo ASAKURA

2013/09
Development of the Status Map for Integration of Ramp Metering and Information ProvisionThe 10th International Conference of Eastern Asia Society for Transportation Studies, Taipei

Kenichi MEGURO, ○Katsuya SAKAI, Takahiko KUSAKABE, Yasuo ASAKURA

2013/09
流入台数とボトルネック容量に着目した都市高速における旅行時間予測

坂井勝哉, 朝倉康夫

土木計画学研究・講演集(CD-ROM)　Vol. 48　2013
統計的旅行時間予測手法の精度検証-都市高速合流部を対象として-

坂井勝哉, 日下部貴彦, 朝倉康夫

日本道路会議論文集(CD-ROM)　Vol. 30th　2013
都市高速合流部を対象とした統計的旅行時間予測手法

坂井勝哉, 日下部貴彦, 朝倉康夫

土木計画学研究・講演集(CD-ROM)　Vol. 46　2012
旅行時間予測値の性能に関する統計分析

坂井勝哉, WEI Chong, 日下部貴彦, 朝倉康夫

土木計画学研究・講演集(CD-ROM)　Vol. 44　2011

Presentations 22

Feasibility Study of Smartphone-Based Estimation of EV Mass and Driving Energy Consumption

Katsuya SAKAI, Wataru ISHIDA, Yasuko KUWATA, Yutaka OTA

The Annual Conference of Power & Energy Society, IEEJ, Okinawa　2025/09
Traffic Engineering Approaches to Planning Electric Vehicle Charging Networks,” Invited speaker in Panel 5: Energy storage and electric vehicles

Katsuya Sakai

International Council on Electrical Engineering (ICEE) Conference, Wuhan, China　2025/07
Optimization of allocation and operation of charging stations to realize middle-mile logistics by electric vehicles

Yuta Tsutsumi, Katsuya Sakai, Hiroshi Morita

EURO 2025, Leeds　2025/06
Electric Vehicle Dynamics and Insights into Transportation Network Analysis

Katsuya SAKAI

Third EXCET Workshop, Osaka　2025/03
Estimating Electrification and Charging Potential of Logistics Vehicles Utilizing Commercial Vehicle Probe Data

Katsuya SAKAI

Proceedings of Infrastructure Planning, Vol. 70, Okayama　2024/11
Optimal Deployment of Quick Chargers Based on Traffic Assignment Model Considering Heterogeneity of Charging Locations

Katsuya SAKAI, Szu-Yuan LIN, and, Jame

IEEJ Joint Technical Meeting on Vehicle Technology/Transportation and Electric Railway, Toyama　2024/09
Spatiotemporal Analysis of Electric Vehicle Charging Demand Based on Trajectory Data

Ryotaro OHARA, Yudai OCHI, Yohei YAMAGUCHI, Hideaki UCHIDA, Shinya YOSHIZAWA, Katsuya SAKAI, Yutaka OTA, Yoshiyuki SHIMODA

IEEJ Annual Conference, Tokushima　2024/03
E-Mobility Digital Twin Designing Electric Vehicle, Charging Infrastructure, and Energy System Integration

JSAE Annual Congress (Spring)　2023/05
Estimating the running and air conditioning power consumption of electric buses in Osaka University

Katsuya SAKAI, Yutaka OTA

IEEJ Transactions on Power and Energy Annual Conference Transactions on Power and Energy, Fukui　2022/09
Electric Vehicle Trials and Dynamic Simulations toward e-Mobility Digital Twins

Yutaka OTA, Shinya YOSHIZAWA, Katsuya SAKAI, Yoshinori UEDA, Masaya TAKASHIMA, Koji KAGAWA, Akihiro IWATA

IEEJ Joint Technical Meeting on Vehicle Technology/Transportation and Electric Railway, Tokyo　2022/09
Overview and Emergent Topics: Energy Aspect and Demonstration

Katsuya SAKAI

Society of Instrument and Control Engineers (SICE) 2021 Conference Workshop, Online　2021/09
Characteristics of ETC2.0 probe data compared to road traffic census data

Shohei YASUDA, Takamasa IRYO, Yuta KOYAMA, Katsuya SAKAI

ISTS&IWTDCS, Matsuyama　2018/08
Investigations of Electronic Toll Collection (ETC) 2.0 system -validati: on of map matching algorithm and analysis of spatial deviation in observed data-

Katsuya SAKAI, Yuta KOYAMA, Shohei YASUDA, Takamasa IRYO

ISTS&IWTDCS, Matsuyama　2018/08
Intentional Removals of Nodes and Links to Avoid Gridlock

Kashin SUGISHITA, Katsuya SAKAI, Takamasa IRYO, Yasuo ASAKURA

Proceedings of Infrastructure Planning, Tokyo　2018/06
Traffic congestion analysis model for sightseeing places with departure time choice equilibrium model

Katsuya SAKAI, Takahiko KUSAKABE

31st Annual Conference of ARSC (Applied Regional Science Conference), Tokyo　2017/11
Pareto Improvement by Introducing Tradable Bottleneck Permits Scheme in a Merging Network

Katsuya SAKAI, Takahiko KUSAKABE, Yasuo ASAKURA

Proceedings of Infrastructure Planning, Vol. 50, Tottori　2014/11
The Welfare Effects of Tradable Bottleneck Permits Scheme with Heterogeneous Income Profiles

Katsuya SAKAI

28th Annual Conference of ARSC (Applied Regional Science Conference), Naha　2014/11
Pareto Improvement and Introducing Tradable Bottleneck Permits Scheme in a Network with Merging Section

Katsuya SAKAI, Takahiko KUSAKABE, Yasuo ASAKURA

49th Annual Conference of Infrastructure Planning, Sendai　2014/06
Travel Time Prediction Method for an Urban Expressway Using the Input Flow and the Capacity at the Bottleneck

Katsuya SAKAI, Yasuo ASAKURA

Proceedings of Infrastructure Planning, Vol. 48, Osaka　2013/11
Accuracy Verification of Statistical Travel Time Prediction ¬Focusing on Merging Section in Urban Expressway

Katsuya SAKAI, Takahiko KUSAKABE, Yasuo ASAKURA

30th Conference of Japan Road Association, Tokyo,　2013/10
Statistical Model of Travel Time Prediction Corresponding to Fluctuation of Bottleneck Capacity on Junction

Katsuya SAKAI, Takahiko KUSAKABE, Yasuo ASAKURA

Proceedings of Infrastructure Planning, Vol. 46, Saitama　2012/11
Statistical Analysis on Performance of Travel Time Prediction

Katsuya SAKAI, Chong WEI, Takahiko KUSAKABE, Yasuo ASAKURA

Proceedings of Infrastructure Planning, Vol. 44, Gifu　2011/11

Institutional Repository 1

Content Published in the University of Osaka Institutional Repository (OUKA)

Large-scale spatiotemporal modeling of travel behavior, electric vehicle charging demand, and flexibility based on human mobility big data

Yamaguchi Yohei, Ochi Yudai, Ohara Ryotaro, Uchida Hideaki, Yoshizawa Shinya, Sakai Katsuya, Ota Yutaka, Shimoda Yoshiyuki

Energy　Vol. 335　2025/10/30