Kazuya Sakai, Ph.D. Associate Professor, Department of Electronics Engineering and Computer Science, Tokyo Metropolitan University, 6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan E-Mail : Tel : (Office) 042-585-8426 (+81-42-585-8426 for international calls) Room: (Office) 1-239, Hino Campus Tel : (Lab) 042-585-TBA Room: (Lab) 2-802, Hino Campus

News

• I published a book about algorithms from Ohmsha. (The book is written in Japanese. The link to amazon is here)

Education

• Dec. 2013: Ph.D. in Computer Science and Engineering, The Ohio State University
• Aug. 2010: M.S. in Computer Science, Auburn University
• Mar. 2007: M.S. in Electronics Engineering, Kansai University
• Mar. 2004: B.S. in Electronics Engineering, Kansai University

Experience

• Apr. 2018 - Present: Associate Professor, Tokyo Metropolitan University, Tokyo, Japan.
• Jan. 2014 - Mar. 2018: Assistant Professor, Tokyo Metropolitan University, Tokyo, Japan.
• Sep. 2010 - Dec. 2013: Graduate Fellow / Teaching Assistant, The Ohio State University, Columbus, OH.
• Aug. 2008 - May. 2010: Graduate Research Assistant, Auburn University, Auburn, AL.
• Apr. 2007 - Mar. 2008: Research Associate, Information Networks Laboratory, Kansai University, Osaka, Japan.

Honor/Awards

• Dec. 9, 2016 - IEEE Computer Society Japan Chapter Young Author Award 2016.
• Sep. 2010 - Aug. 2011: The Departmental Fellowship, Computer Science and Engineering, The Ohio State University.
• May. 2005 - Dec. 2006: Research Scholar, Computer Science and Software Engineering, Auburn University.

Research Interests

• Information and network security
• Security and privacy
• Distributed algorithms and systems
• Reinforcement learning

Selected Publications

IEEE and ACM Transactions (Summary: 18 IEEE Transactions and 1 ACM Transaction)

• [TSC] Haruumi Imamura, Kazuya Sakai, Min-Te Sun, and Wei-Shinn Ku, "Modeling Real-Time Task Assignment for Mobile Crowdsourcing in Opportunistic Networks," IEEE Transactions on Services Computing (TSC), in press. [online version]
• [TGCN] Kazuya Sakai, Min-Te Sun, and Wei-Shinn Ku, "Multi-Tree-Based Avoidance Multicast Routing for Wireless Sensor Networks," IEEE Transactions on Green Communications and Networking (TGCN), in press.
• [TGCN] Rihito Tuchida, Kazuya Sakai, Min-Te Sun, and Wei-Shinn Ku, "On Wireless Charging for Mobile Sensors," IEEE Transactions on Green Communications and Networking (TGCN), vol. 8, no. 3, pp. 1156-1167, 2024.
• [TITS] Kotcharat Kitchat, Yi-Lun Chiu, Yi-Lun Chiu, Min-Te Sun, Tomotaka Wada, Kazuya Sakai, Wei-Shinn Ku, Shiaw-Chian Jeng, Andy An-Kai Jeng, and Ching-Hao Liu, "PedCross: Pedestrian Crossing Prediction for Auto-driving Bus," IEEE Transactions on Intelligent Transportation Systems (TITS), vol. 25, no. 8, pp. 8730-8740, 2024.
• [TMC] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, and Jie Wu, "Barrier Penetration Routing Against Wireless Spy Sensors," IEEE Transactions on Mobile Computing (TMC), vol. 25, no. 5, pp. 4634 - 4647, 2024.
• [TNSE] Kazuya Sakai, Katsunori Takenaka, Min-Te Sun, and Wei-Shinn Ku, "Priority-Aware Task Assignment in Opportunistic Network-Based Crowdsourcing," IEEE Transactions on Network Science and Engineering (TNSE), vol. 1, no. 2, pp. 2327-4697, 2024.
• [TKDE] Seiya Jumonji, Kazuya Sakai, Min-Te Sun, and Wei-Shinn Ku, "Privacy-Preserving Collaborative Filtering Using Fully Homomorphic Encryption," IEEE Transactions on Knowledge and Data Engineering (TKDE), vol. 35, no. 3, pp. 2961-2974, 2023.
• [TNSE] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, and Jie Wu, "Towards Wireless Power Transfer in Mobile Social Networks," IEEE Transactions on Network Science and Engineering (TNSE), vol. 9, no. 3, pp. 1091-1103, 2022.
• [TKDE] Chia-Yu Lo, Min-Te Sun, Ling-Jyh Chen, Kazuya Sakai, and Wei-Shinn Ku, "Recurrent Learning on PM2.5 Prediction Based on Clustered Airbox Dataset," IEEE Transactions on Knowledge and Data Engineering (TKDE), vol. 34, no. 10, pp. 4994-5008, 2022.
• [TVT] Pei-Ya Ting, Tomotaka Wada, Min-Te Sun, Kazuya Sakai, Wei-Shinn Ku, Andy An-Kai Jeng, and Jing-Shyang Hwu, "Freeway Travel Time Prediction using Deep Hybrid Model – Taking Sun Yat-sen Freeway as an Example," IEEE Transactions on Vehicular Technology (TVT), vol. 69, no. 8, pp. 8257-8266, 2020.
• [TWC] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, Jie Wu, and Ten H. Lai, "Secure Data Communications in Wireless Networks Using Multi-Path Avoidance Routing," IEEE Transactions on Wireless Communications (TWC), vol. 18, no. 10, pp. 4753 - 4767, 2019.
• [TMC] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, and Jie Wu, "On Anonymous Routing in Delay Tolerant Networks," IEEE Transactions on Mobile Computing (TMC), vol. 18, no. 12, pp. 2926-2940, 2019.
• [TMC] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, Jie Wu, and Faisal S. Alanazi, "Performance and Security Analyses of Onion-Based Anonymous Routing for Delay Tolerant Networks," IEEE Transactions on Mobile Computing (TMC), vol. 16, no. 12, pp. 3473-3487, 2017.
• [TDSC] Min-Te Sun, Kazuya Sakai, Wei-Shinn Ku, Ten H. Lai, and Athanasios V. Vasilakos, "Private and Secure Tag Access for Large-Scale RFID Systems," IEEE Transactions on Dependable and Secure Computing (TDSC), vol. 13, no. 6, pp. 657-671, 2016.
• [TC] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, and Ten H. Lai, "A Novel Coding Scheme for Secure Communications in Distributed RFID Systems," IEEE Transactions on Computers (TC), vol. 65, no. 2, pp. 409-421, 2016.
• [TOMM] Kazuya Sakai, Wei-Shinn Ku, Min-Te Sun, and Roger Zimmermann, "Privacy Preserving Continuous Multimedia Streaming in MANETs," ACM Transactions on Multimedia Computing Communications and Applications (TOMM), vol. 9, issue 4:23, 2013.
• [TC] Kazuya Sakai, Wei-Shinn Ku, Roger Zimmermann, and Min-Te Sun, "Dynamic Bit Encoding for Privacy Protection Against Correlation Attacks in RFID Backward Channel," IEEE Transactions on Computers (TC), vol. 62, no. 1, pp. 112-123, 2013.
• [TMC] Kazuya Sakai, Scott C.-H. Huang, Wei-Shinn Ku, Min-Te Sun, and Xiuzhen Cheng, "Timer-Based CDS Construction in Wireless Ad Hoc Networks," IEEE Transactions on Mobile Computing (TMC), vol. 10, no. 10, pp. 1388-1402, 2011.

Selected conferences

• [ICDCS'24] Kazuya Sakai, Takeshi Kitamura, Min-Te Sun, and Wei-Shinn Ku, "On Federated Multi-Armed Bandits for Mobile Social Networks," In ICDCS, 2024. Acceptance rate: 121/552 = 21.9%.
• [INFOCOM'19] Kazuya Sakai, Min-Te Sun, and Wei-Shinn Ku, "Data-Intensive Routing in Delay-Tolerant Networks," In INFOCOM, pp. 2440-2448, 2019. Acceptance rate: 288/1,464 = 19.7%.
• [PerCom'19] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, and Ten H. Lai, "On The Performance Bound of Structured Key-Based RFID Authentication," pp. 1-10, In PerCom, 2019. Acceptance rate: 30/151 = 19.8%.
• [ICNP'17] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, and Jie Wu, "A Framework for Anonymous Routing in Delay Tolerant Networks," In ICNP, pp. 1-10, 2017. Acceptance rate: 39/209 = 18.66%.
• [INFOCOM'17] Tomoya Osuki, Kazuya Sakai, and Satoshi Fukumoto, "Contact Avoidance Routing in Delay Tolerant Networks," In INFOCOM, pp. 1-9, 2017. Acceptance rate: 292/1,395 = 20.93%. [Errata]
• [ICDCS'16] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, Jie Wu, and Faisal S. Alanazi, "An Analysis of Onion-Based Anonymous Routing for Delay Tolerant Networks," In ICDCS, pp. 609-618, 2016. Acceptance rate: 68/386 = 17.6%.
• [ICDCS'15] Kazuya Sakai, Min-Te Sun, Wei-Shinn Ku, Jie Wu, and Ten H. Lai, "Multi-Path-Based Avoidance Routing in Wireless Networks," In ICDCS, pp. 706-715, 2015. Acceptance rate: 70/543 = 12.9%. (IEEE Computer Society Japan Chapter Young Author Award 2016)

My full publications list is HERE.

Invited Talk

• Invited Speaker: "Avoidance Routing for Secure Communications," Muroran-IT, Jan. 9, 2024
• Invited Speaker: "On Algorithm Designs for Wireless Power Transfer," Muroran-IT, Jan. 25, 2023.
• Invited Speaker: "Toward Academic Excellence," IEEE Sapporo Section YP and IEEE Muroran Institute of Technology Student Branch, Oct. 23, 2020. [Link 1, Link 2]
• Invited Speaker: "Secure Routing in Wireless Ad Hoc Networks," IEICE Hokkaido Section, Muroran-IT, Feb. 20, 2017.

Professional Services

• TPC : IPCCC 2024, WASA 2024
• TPC : IPCCC 2023, WASA 2023
• TPC : IPCCC 2022, WASA 2022
• TPC : ICCCN 2021, IPCCC 2021, WASA 2021
• TPC : ICCCN 2020 (Area co-chair), IPCCC 2020, WASA 2020
• TPC : ICDCS 2019, IPCCC 2019, ICCCN 2019
• TPC : IPCCC 2018, ICCCN 2018

The detail is available at HERE.

Books

• Kazuya Sakai, "Introduction to Algorithm by Python," Ohmsha, 2020. (The book is written in Japanese) [avaialble at amazon]
• Kazuya Sakai, "Introduction to Rust Programing," Ohmsha, 2019. (The book is written in Japanese) [avaialble at amazon]
• Kazuya Sakai, "Computer Hijacking," Ohmsha, 2018. (The book is written in Japanese) [available at amazon]

Teaching

• Semester II: Mathematics for Computer Science
• Semester VI: Analysis of Algorithms
• Semester VI: Modern Computer Architectures
• Semester VII: Introduction to Cryptography
• Graduate Level (biennial): Advanced Information Security (Applied Cryptography)
• Graduate Level (biennial): Research Project Lab. (File Sharing Software)

The detail is available at HERE.

Software

• May 2005 - Aug. 2005 Java-based Collision Avoidance System for Vehicular Communications.
• Jun. 2012 - Jul. 2012 CSE 3461/5461 - Network Simulator
• Jul. 2012 - Aug. 2012 Java-based Network Simulator

Research Memo

• My experience in NS2 for wireless networks.