A study on user authentication infrastructure for next generation telematics. - Katsuyuki Umezawa; Seiichi Susaki; Masamori Kashiyama; Satoru Tezuka (ICVES, 2008)

An authentication system using smart phones as secure storage. - Katsuyuki Umezawa; Satoru Tezuka; Shigeichi Hirasawa (SMC, 2011)

Development and Evaluation of FMC Authentication Technology with Cellular Phones. - Katsuyuki Umezawa; Satoru Tezuka (IEICE Trans. Commun., 2011)

Development and Evaluation of a Virtual PC Type Thin Client System. - Katsuyuki Umezawa; Tomoya Miyake; Hiromi Goto (Globe, 2013)

Proposal and evaluation by simulation of management processing load control method for virtual client system. - Katsuyuki Umezawa; Hiromi Goto (SMC, 2014)

An Effective Flipped Classroom Based on Log Information of Self-Study. - Katsuyuki Umezawa; Michitaka Aramoto; Manabu Kobayashi; Takashi Ishida 004; Makoto Nakazawa; Shigeichi Hirasawa (ACIT-CSI, 2015)

A Method Based on Self-Study Log Information for Improving Effectiveness of Classroom Component in Flipped Classroom Approach. - Katsuyuki Umezawa; Takashi Ishida 004; Michitaka Aramoto; Manabu Kobayashi; Makoto Nakazawa; Shigeichi Hirasawa (Int. J. Softw. Innov., 2016)

An Electroencephalograph-Based Method for Judging the Difficulty of a Task Given to a Learner. - Katsuyuki Umezawa; Tomohiko Saito; Takashi Ishida 004; Makoto Nakazawa; Shigeichi Hirasawa (ICALT, 2017)

Evaluation by Questionnaire on Grouped Flipped Classroom Method. - Katsuyuki Umezawa; Takashi Ishida 004; Makoto Nakazawa; Shigeichi Hirasawa (ICEED, 2018)

Application and Evaluation of a Grouped Flipped Classroom Method. - Katsuyuki Umezawa; Takashi Ishida 004; Makoto Nakazawa; Shigeichi Hirasawa (TALE, 2018)

Learning State Estimation Method by Browsing History and Brain Waves During Programming Language Learning. - Katsuyuki Umezawa; Tomohiko Saito; Takashi Ishida 004; Makoto Nakazawa; Shigeichi Hirasawa (WorldCIST (2), 2018)

Application of Grouped Flipped Classroom to Two-Year Actual Class and Its Statistical Evaluation. - Katsuyuki Umezawa; Takashi Ishida 004; Makoto Nakazawa; Shigeichi Hirasawa (ICCSE, 2019)

Competitive Compliance with Blockchain. - Sven Wohlgemuth; Katsuyuki Umezawa; Yusuke Mishina; Kazuo Takaragi (PerCom Workshops, 2019)

Development of Debugging Exercise Extraction System using Learning History. - Katsuyuki Umezawa; Makoto Nakazawa; Masayuki Goto; Shigeichi Hirasawa (T4E, 2019)

Learning-State-Estimation Method Using Browsing History and Electroencephalogram During Programming Language Learning and Its Evaluation. - Katsuyuki Umezawa; Tomohiko Saito; Takashi Ishida 004; Makoto Nakazawa; Shigeichi Hirasawa (HELMeTO, 2020)

Evaluation of Grouped Flipped Classrooms Compared with Three-Year Actual Classes Using a Questionnaire. - Katsuyuki Umezawa; Takashi Ishida 004; Makoto Nakazawa; Shigeichi Hirasawa (ICACIT, 2020)

Detection of Careless Mistakes during Programming Learning using a Simple Electroencephalograph. - Katsuyuki Umezawa; Makoto Nakazawa; Manabu Kobayashi; Yutaka Ishii; Michiko Nakano; Shigeichi Hirasawa (ICCSE, 2020)

Analysis of Logic Errors Utilizing a Large Amount of File History During Programming Learning. - Katsuyuki Umezawa; Makoto Nakazawa; Manabu Kobayashi; Yutaka Ishii; Michiko Nakano; Shigeichi Hirasawa (TALE, 2020)

Comparison Experiment of Learning State Between Visual Programming Language and Text Programming Language. - Katsuyuki Umezawa; Yutaka Ishii; Makoto Nakazawa; Michiko Nakano; Manabu Kobayashi; Shigeichi Hirasawa (TALE, 2021)

Evaluation of Difficulty During Visual Programming Learning Using a Simple Electroencephalograph and Minecraft Educational Edition. - Katsuyuki Umezawa; Makoto Nakazawa; Manabu Kobayashi; Yutaka Ishii; Michiko Nakano; Shigeichi Hirasawa (WorldCIST (3), 2021)

Safety and Security Analysis using LDA based on Case Reports: Case Study and Trust Evaluation Method. - Katsuyuki Umezawa; Hiroki Koyanagi; Sven Wohlgemuth; Yusuke Mishina; Kazuo Takaragi (ARES, 2022)

Brain Wave, Heart Rate, and Facial Expression Relationship Validation During Programming Learning Comprehension Study. - Katsuyuki Umezawa; Makoto Nakazawa; Michiko Nakano; Shigeichi Hirasawa (HELMeTO, 2022)

A Study on the Relationship Between Brain Waves, Heart Rate, and Facial Expressions During Programming Learning. - Katsuyuki Umezawa; Makoto Nakazawa; Michiko Nakano; Shigeichi Hirasawa (SMC, 2022)

Evaluation of Applying LDA to Redacted Documents in Security and Safety Analysis. - Katsuyuki Umezawa; Sven Wohlgemuth; Keisuke Hasegawa; Kazuo Takaragi (CSR, 2023)

Proposal and Evaluation of Intermediate Content for the Transition from Visual to Text-Based Programming Languages. - Katsuyuki Umezawa; Kouta Ishida; Makoto Nakazawa; Shigeichi Hirasawa (HICSS, 2023)

Utilizing Automatic Speech Recognition for English Pronunciation Practice and Analyzing its Impact. - Katsuyuki Umezawa; Makoto Nakazawa; Michiko Nakano; Shigeichi Hirasawa (ICEED, 2023)

A Study on the Relationship Between Heart Rate and Brain Waves During Programming Task in Several Experiments. - Katsuyuki Umezawa; Mitsuaki Sawata; Makoto Nakazawa; Shigeichi Hirasawa (ICSCA, 2023)

Differential Analysis of Biological Information during the Learning of a Second Language and a Programming Language. - Katsuyuki Umezawa; Takumi Tajima; Michiko Nakano; Makoto Nakazawa; Shigeichi Hirasawa (TALE, 2023)

Secure Revocation Features in eKYC - Privacy Protection in Central Bank Digital Currency. - Kazuo Takaragi; Takashi Kubota; Sven Wohlgemuth; Katsuyuki Umezawa; Hiroki Koyanagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2023)

Verification of the effectiveness of classes using intermediate content for transitioning from a visual-to a text-based programming language. - Katsuyuki Umezawa; Makoto Nakazawa; Shigeichi Hirasawa (ICALT, 2024)

Mental Stress Analysis During Visual- And Text-Based Language Learning by Measuring Heart Rate Variability. - Katsuyuki Umezawa; Takumi Koshikawa; Makoto Nakazawa; Shigeichi Hirasawa (WorldCIST (4), 2024)

Contextual Coherence Evaluation of Perfectly Secure Steganography in Text Documents. - Katsuyuki Umezawa; Toshikatsu Kashima; Sven Wohlgemuth; Kazuo Takaragi (ARES (Workshops 3), 2025)

Mental stress analysis by measuring heart rate variability during learning programming: Comparison of visual- and text-based languages. - Katsuyuki Umezawa; Takumi Koshikawa; Makoto Nakazawa; Shigeichi Hirasawa (J. Comput. Lang., 2025)