Shin Kawai
kawai[at]digicon-lab.esys.tsukuba.ac.jp
Doctoral Program in Intelligent Interaction Technologies, Graduate School of Systems and Information Engineering, University of Tsukuba (Doctor of Philosophy in Engineering)
Master’s Program in Intelligent Interaction Technologies, Graduate School of Systems and Information Engineering, University of Tsukuba (Master of Engineering)
College of Engineering Systems, School of Science and Engineering, University of Tsukuba (Bachelor of Engineering)
Assistant Professor: Faculty of Engineering, Information and Systems, University of Tsukuba
Researcher (Non-Full-time): Faculty of Engineering, Information and Systems, University of Tsukuba
Postdoctoral Fellow: Faculty of Engineering, Information and Systems, University of Tsukuba
Teaching Assistant: Introduction to College Mathematics
Teaching Assistant: Advanced Laboratory of Intelligent Interactive Systems
Research Assistant (short-term employment): Department of intelligent Interaction Technologies, Graduate School of Systems and Information Engineering, University of Tsukuba
Teaching Assistant: Advanced Laboratory of Intelligent Interactive Systems
Research Assistant (short-term employment): Department of intelligent Interaction Technologies, Graduate School of Systems and Information Engineering, University of Tsukuba
Teaching Assistant: Advanced Laboratory of Intelligent Interactive Systems
Research Assistant (short-term employment): Department of intelligent Interaction Technologies, Graduate School of Systems and Information Engineering, University of Tsukuba
Teaching Assistant: Advanced Laboratory of Intelligent Interactive Systems
IEEE (2016 – Present)
The Japanese Society for Artificial Intelligence (2019 – Present)
Outstanding Master’s Thesis Award
Japan Society for the Promotion of Science/Grant-in-Aid for Scientific Research (C), 2025/04/01–2028/03/31, Project/Area Number: 25K07789, Research Project: A Biproper Design Method for Improving Transient Characteristics of PIM-Based Control Systems with Guaranteed Stability (KAKEN)
Japan Society for the Promotion of Science/Grant-in-Aid for Early-Career Scientists, 2020/04/01–2022/03/31, Project/Area Number: 20K14759, Research Project: Discretization of an Improper System with a Descriptor System and its Application to Control System Design (KAKEN)
The HAYAO NAKAYAMA Foundation for Science & Technology and Culture, 2019/03/01–2020/02/29, Research Project: High Precision Eye Tracking Using Deep Capsule Network and its Application to User Emotion Estimation
Shin Kawai, “Generalized Discrete-Time Models for Descriptor Systems with Arbitrary Initial Conditions,” Ph.D. thesis, University of Tsukuba, Japan, Mar. 2017.
Shin Kawai, “Development of Discretization Techniques for Linear Descriptor Systems,” M.Eng. thesis, University of Tsukuba, Japan, Mar. 2013.
Shin Kawai, “Linear Descriptor Systems and Their Exact Discrete-Time Model,” B.Eng. thesis, University of Tsukuba, Japan, Mar. 2011.
T. Oshima, S. Kawai and T. Nguyen-van, “Nonlinear Sampled-Data Control Systems: Stability Theorem via Commutativity of Linearization and Discretization,“ IEEE Access, vol. 13, pp. 37904-37912, 2025. (PDF)
S. Kume, S. Kawai and H. Nobuhara, “Efficient Design of Coanda UAV Based on Surrogate Models,“ IEEE Access, vol. 12, pp. 118286-118294, 2024. (PDF)
I. Firmansyah, Y. Yamaguchi, T. Maruyama, Y. Matsuura, Z. Heming, S. Kawai, H. Nobuhara, “FPGA-based stereo matching for crop height measurement using monocular camera,“ Microprocessors and Microsystems, vol. 108, 2024. (PDF)
T. Kubota, Y. Ochiai, N. Hori, T. Nguyen-Van, S. Kawai, “Structure Selecting and Design Method for Control Systems Considering Plant’s Order Change,“ IEEE Access, vol. 12, pp. 78423-78433, 2024. (PDF)
R. Morishita, S. Kawai, H. Nobuhara, “Downwash reduction drone with adaptive rotors and its 3D aerodynamic analysis and stabilization control,“ IEEE Access, vol. 12, pp. 22832-22840, 2024. (PDF)
Y. Matsuura, H. Zhang, K. Nakao, C. Qiong, I. Firmansyah, S. Kawai, Y. Yamaguchi, T. Maruyama, H. Hayashi and H. Nobuhara, “High-precision plant height measurement by drone with RTK-GNSS and single camera for real-time processing,“ Scientific Reports, vol. 13, no. 6329, 2023. (PDF)
N. Ohta, S. Kawai and H. Nobuhara, “Capsule Network Extension Based on Metric Learning,” Journal of Advanced Computational Intelligence and Intelligent Informatics, vol. 27, no. 2, pp. 173–181, 2023. (PDF)
R. Sakata, S. Kawai and T. Nguyen-Van, “Equilibrium Space and a Pseudo Linearization of Nonlinear Systems,“ Scientific Reports, vol. 12, no. 21147, 2022. (PDF)
K. Fukuda, S. Kawai, and H. Nobuhara, “Attitude estimation of connected drones based on extended Kalman filter under real outdoor environments,“ Advanced Robotics, pp. 1-12, 2022. (Abstract)
S. Nagae, D. Kanda, S. Kawai and H. Nobuhara, “Automatic layer selection for transfer learning and quantitative evaluation of layer effectiveness,” Neurocomputing, vol. 469, no. 16, pp. 151–162, 2022. (Abstract)
T. Sasagawa, S. Kawai and H. Nobuhara, “Recommendation System Based on Generative Adversarial Network with Graph Convolutional Layers,” Journal of Advanced Computational Intelligence and Intelligent Informatics, vol. 25, no. 4, pp. 389–396, 2021. (PDF)
D. Isobe, N. Hori, S. Kawai, K. Yagi and T. Nguyen-Van, “Digital Control of a Stepping Motor for Eliminating Rotation Speed Fluctuations Using Adaptive Gains,” Electronics, vol. 10, no. 11, 1335, 2021. (PDF)
D. Kanda, S. Kawai and H. Nobuhara, “Visualization Method Corresponding to Regression Problems and Its Application to Deep Learning-Based Gaze Estimation Model,” Journal of Advanced Computational Intelligence and Intelligent Informatics, vol. 24, no. 5, pp. 676–684, 2020. (PDF)
S. Kawai and N. Hori, “Generalized Discretization of Continuous-Time Distributions,” The Journal of Engineering, vol. 2020, No. 7, p. 259-267, 2020. (PDF)
S. Imai, S. Kawai and H. Nobuhara, “Stepwise PathNet: a layer-by-layer knowledge-selection-based transfer learning algorithm,” Scientific Reports, vol. 10, no. 8132, (2020). (PDF)
H. Zhang, H. Li, N. Hironaka, S. Kawai and H. Nobuhara, “Improving Safety and Reducing Size in Multicopters by Adjusting Propeller Height and Its Applications to Remote Sensing,” Agricultural Information Research, vol. 28, no. 4, pp. 157–167, 2019. (in Japanese) (PDF)
Y. Gao, S. Kawai and H. Nobuhara, “Scalable Blockchain Protocol Based on Proof of Stake and Sharding,” Journal of Advanced Computational Intelligence and Intelligent Informatics, vol. 23, no. 5, pp. 856–863, 2019. (PDF)
S. Kawai and N. Hori, “General Mapping Discrete-Time Models of a Descriptor System with an Arbitrary Initial Condition,” Automatica, vol. 87, pp. 428–431, 2018. (Abstract)
S. Kawai and N. Hori, “Mapping Discrete-Time Models for Descriptor-Systems with Consistent Initial Conditions,” Transactions of the Canadian Society for Mechanical Engineering, vol. 40, no. 1, pp. 59–77, 2016. (PDF)
Y. Ochiai, T. Nguyen-Van, S. Kawai, “Given Data of System Requirements for Canonical Controller Design,” 2025 IEEE/SICE International Symposium on System Integration (SII), pp. 611–616, Munich, Germany, January 21–24, 2025. (Abstract)
N. Kinjo, S. Kawai and T. Nguyen-Van, “Stochastic Control for Stepper Motors using Gaussian Filter-based Disturbance and State Observer,“ IECON 2024 - 50th Annual Conference of the IEEE Industrial Electronics Society, pp. 1-6, Chicago, IL, USA, 2024. (Abstract)
M. Imaseki, T. Nguyen-Van and S. Kawai, “Crop Row Error Measurement Method for Tracking Control by Maximum Likelihood Using Normal Distribution Error Model,“ 2024 SICE Festival with Annual Conference (SICE FES), pp. 1323-1326, Kochi City, Japan, August 27-30, 2024.
K. Iwaki, S. Kawai and T. Nguyen-Van, “Discrete-Time Calculation Methods for Fractional Calculus using Delta Operator and Matrices,“ 2024 SICE Festival with Annual Conference (SICE FES), pp. 1128-1133, Kochi City, Japan, August 27-30, 2024. (Abstract)
Y. Kotani, S. Kawai and T. Nguyen-Van, “A New Controller Design Method for Sampled-Data Systems in Canonical Form,“ 2024 SICE Festival with Annual Conference (SICE FES), pp. 949-952, Kochi City, Japan, August 27-30, 2024.
T. Tono, T. Nguyen-Van and S. Kawai, “Application of PID Control to Nonlinear Models of Quadcopters,“ 2024 SICE Festival with Annual Conference (SICE FES), pp. 665-668, Kochi City, Japan, August 27-30, 2024.
Q. Yao, S. Kawai and T. Nguyen-Van, “Analysis of Input Voltage-Output Frequency Relationship in VCOs Using a Linear Time-Varying Model,“ 2024 Tenth International Conference on Communications and Electronics (ICCE), pp. 291-296, Danang, Vietnam, July 31– August 2, 2024. (Abstract)
T. Oshima, S. Kawai, T. Nguyen-Van, “A Discrete-Time Linearization Feedback Control for Nonlinear Continuous-Time Systems,” Proceedings of 2024 Australian & New Zealand Control Conference (ANZCC), pp. 253–258, Gold Coast, Australia, February 1–2, 2024. (Abstract)
Y. Tokutomi, T. Nguyen-Van, S. Kawai, “On the Relationship Between Discrete-Time Bode Plots and Actual System Response,” Proceedings of 2024 Australian & New Zealand Control Conference (ANZCC), pp. 186–191, Gold Coast, Australia, February 1–2, 2024. (Abstract)
Y. Ochiai, T. Nguyen-Van, S. Kawai, “PID Controller Design with Discrete-Time Reference Model Based on Kitamori’s Partial Model Matching Method,” Proceedings of 2024 Australian & New Zealand Control Conference (ANZCC), pp. 186–191, Gold Coast, Australia, February 1–2, 2024. (Abstract)
X. Chen, S. Kawai, T. Nguyen-Van, “Model Predictive Control for Stand-Alone Half-Bridge Inverter,” Proceedings of 2023 IEEE 12th Global Conference on Consumer Electronics (GCCE), pp. 1183–1187, Nara, Japan, October 10–13, 2023. (Abstract)
Q. Yao, S. Kawai, T. Nguyen-Van, “Output Frequency Calculation for VCO Based on Nonlinear State Space Model,” Proceedings of 2023 IEEE 12th Global Conference on Consumer Electronics (GCCE), pp. 1179–1182, Nara, Japan, October 10–13, 2023. (Abstract)
S. Kawai and K. Yagi, “Matched Pole-Zero Model Independent of the Properness of Systems,” IFAC World Congress 2023 (IFAC 2023), pp. 1872–1877, Yokohama, Japan, July 9–14, 2023. (PDF)
T. Suzuki, Y. Tokutomi, N. Hori, T. Nguyen-Van, and S. Kawai, “Two Methods to Discretize the Wave Equation in Time and Space,” Proceedings of The 10th International Conference on Control, Mechatronics and Automation (ICCMA 2022), pp. 148–153, Belval, Luxembourg, November 09–12, 2022. (Abstract)
N. Kinjo, S. Kawai and T. Nguyen-Van, “Disturbance Observer-based Nonlinear State Feedback Control for Microstepping Mode of Stepper Motors,” Proc. 2022 61st Annual Conference of the Society of Instrument and Control Engineers (SICE 2022), pp. 152-157, Kumamoto, Japan, September 06-09, 2022. (Abstract)
T. Oshima, S. Kawai and T. Nguyen-Van, “A Discrete-time Linearization Feedback Control for the Van der Pol Oscillator,” Proc. 2022 61st Annual Conference of the Society of Instrument and Control Engineers (SICE 2022), pp. 574-579, Kumamoto, Japan, September 06-09, 2022. (Abstract)
Y. Tokutomi, T. Nguyen-Van and S. Kawai, “A Study on Interpretation and Indices of Discrete-Time Bode Diagrams for Improving Transient Response of Digital Control Systems,” Proc. 2022 61st Annual Conference of the Society of Instrument and Control Engineers (SICE 2022), pp. 653-656, Kumamoto, Japan, September 06-09, 2022.
R. Sakata, S. Kawai and T. Nguyen-Van, “A Nonlinear Discrete-time Model for Controlled Moment Gyroscope,“ Proc. 2022 SICE International Symposium on Control Systems (SICE ISCS), pp. 95–101, Yokohama, Japan, March 08–10, 2022. (Abstract)
F. Iman, Y. Yamaguchi, T. Maruyama, Y. Matsuura, H. Zhang, S. Kawai and H. Nobuhara, “FPGA-based implementation of stereo disparity map using semi-global matching for crop height measurement,“ International Workshop on Machine Learning for Cyber-Agricultural Systems, Online, November 02–04, 2021.
T. Kubota, N. Hori, T. Nguyen-Van and S. Kawai, “Discretization Accuracy of Mapping Models in Closed-Loop,“ Proc. 2021 IEEE 10th Global Conference on Consumer Electronics (GCCE), pp. 885–889, Kyoto, Japan, October 12–15, 2021. (Abstract)
L. Shuyi, H. Zhang, S. Kawai and H. Nobuhara, “3D Point Cloud Reconstruction Based on Stereo Camera and RTK-GPS with High Accuracy under Sequential Correction,“ Proc. 2020 IEEE 9th Global Conference on Consumer Electronics (GCCE), pp. 90–93, Kobe, Japan, October 13–16, 2020. (Abstract)
Y. Matsuura, H. Zhang, S. Kawai and H. Nobuhara, “High-Precision/Throughput Growth Measurement of Crops by Drone with Stereo Matching Based on RTK-GNSS and Single Camera,“ Proc. 2020 IEEE 9th Global Conference on Consumer Electronics (GCCE), pp. 936–939, Kobe, Japan, October 13–16, 2020. (Abstract)
K. Fukuda, S. Kawai, and H. Nobuhara, “Attitude Estimation by Kalman Filter Based on the Integration of IMU and Multiple GPSs and Its Application to Connected Drones,“ Proc. 2020 59th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE 2020), pp. 1286-1292, Chiang Mai, Thailand, September 23–26, 2020. (Abstract)
H. Zhang, S. Kawai, and H. Nobuhara, “Multi-Rotor Attitude Control Using Cascade-LADRC with Reduced Order LESO,“ Proc. 2020 59th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE 2020), pp. 1422-1427, Chiang Mai, Thailand, September 23–26, 2020. (Abstract)
T. Kubota, N. Hori, T. Nguyen-Van, and S. Kawai, “Design of a Controller for Plants Undergoing Order Changes,“ Proc. 2020 59th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE 2020), pp. 1729-1733, Chiang Mai, Thailand, September 23–26, 2020.
S. Kawai and N. Hori, “Interpretation of Kitamori’s Partial-Model-Matching Method in a Descriptor-Form Expression,” Proc. 2020 IEEE Conference on Control Technology and Applications (CCTA 2020), pp. 928-932, Montréal, Canada, August 24–26, 2020. (Abstract)
S. Nagae, S. Kawai, and H. Nobuhara, “Transfer Learning Layer Selection Using Genetic Algorithm,” IEEE WORLD CONGRESS ON COMPUTATIONAL INTELLIGENCE (WCCI) 2020, Glasgow, United Kingdom, July 19–24, 2020. (Abstract)
N. Ohta, S. Kawai, and H. Nobuhara, “Analysis and Learning of Capsule Networks Robust for Small Image Deformation,” IEEE WORLD CONGRESS ON COMPUTATIONAL INTELLIGENCE (WCCI) 2020, Glasgow, United Kingdom, July 19–24, 2020. (Abstract)
M. Sato, S. Kawai and H. Nobuhara, “Action-Triggering Recommenders: Uplift Optimization and Persuasive Explanation,” Proceedings of 2019 International Conference on Data Mining Workshops (ICDMW), pp. 1060–1069, Beijing, China, November 8–11, 2019. (Abstract)
D. Kanda, S. Kawai and H. Nobuhara, “Visualization technique for improving gaze estimation models based on deep learning,” the 6th International Workshop on Advanced Computational Intelligence and Intelligent Informatics (IWACIII2019), Chengdu, China, November 1–5, 2019.
K. Aikawa, S. Kawai and H. Nobuhara, “Multilingual Inappropriate Text Content Detection System Based on Doc2vec,” Proceedings of 2019 IEEE 8th Global Conference on Consumer Electronics (GCCE 2019), Osaka, Japan, October 15–18, 2019. (Abstract)
Y. Mikuni, S. Kawai and H. Nobuhara, “A Study on a Combination of Sparse Coding and Dictionay Learning Algorithms for Sparse Super-Resolution,” Proceedings of 2019 IEEE 8th Global Conference on Consumer Electronics (GCCE 2019), Osaka, Japan, October 15–18, 2019. (Abstract)
N. Hironaka, S. Kawai and H. Nobuhara, “Strawberry Observation Robot Using Rotation Overcoming Function and Examination of its Long-Term Operation,” the Second International Workshop on Machine Learning for Cyber-Agricultural Systems (MLCAS 2019), Iowa, USA, September 11–12, 2019.
S. Nagae, S. Kawai and H. Nobuhara, “Relationship Between Layer Selection and Model Performance in Transfer Learning,” the Second International Workshop on Machine Learning for Cyber-Agricultural Systems (MLCAS 2019), Iowa, USA, September 11–12, 2019.
S. Kawai and N. Hori, “On the Choice of a Proper Initial Condition for Derivative Controllers,” Proceedings of the 44th Annual Conference on IEEE Industrial Electronics Society (IECON 2018), pp. 2391–2396, Washington D.C., USA, October 21–23, 2018. (Abstract)
R. Shimomura, S. Kawai and H. Nobuhara, “Designing a Safe Drone with the Coanda Effect Based on a Self-Organizing Map,” Proceedings of 2018 IEEE International Conference on Systems, Man, and Cybernetics (SMC), pp. 4171–4177, Miyazaki, Japan, October 7–10, 2018. (Abstract)
S. Kawai and N. Hori, “Exact Temporal/Spatial Discretization of a Parabolic Partial-Differential-Equation,” Proceedings of The 5th International Conference on Control, Mechatronics and Automation (ICCMA 2017), pp. 131–136, Edmonton, Canada, October 11–13, 2017. (Abstract)
S. Kawai and N. Hori, “A New Interpretation of Order-Changes in Terms of Mode-Shifts in a Descriptor System,” Proceedings of the 36th IASTED Conference on Modelling, Identification and Control (MIC 2017), pp. 63–68, Innsbruck, Austria, February 20–21, 2017. (Abstract)
S. Kawai and N. Hori, “On Initial Conditions for State-space Discrete-time Models,” Proceedings of the 35th IASTED Conference on Modelling, Identification and Control (MIC 2016), pp. 108–113, Innsbruck, Austria, February 15–16, 2016. (Abstract)
S. Kawai and N. Hori, “On Bi-Proper Mapping Discretization of a Regular Descriptor System,” Proceedings of the 38th Annual Conference on IEEE Industrial Electronics Society (IECON 2012), pp. 2366–2371, Montreal, Canada, October 25–28, 2012. (Abstract)
S. Kawai and N. Hori, “Linear Descriptor Systems and Their Exact Discrete-Time Model,” Proceedings of SICE Annual Conference 2011 (SICE 2011), pp. 2233–2236, Tokyo, Japan, September 13–18, 2011. (Abstract)
S. Kawai, “Progress of safety drones,” CREST International Symposium on Big Data Application, Tokyo, Japan, Jan. 13–14, 2020.
Y. Gao, S. Kawai and H. Nobuhara, “A study on High Scalable Blockchain,” 47th the Asia Pacific Advanced Network (APAN 47), Daejeon, Korea, February 18–22, 2019.