| Client-server system for controlling access rights to certain services by a user of a client terminal S Susaki, H Umeki, K Umezawa, S Miyazaki, K Matsunaga, M Kitagawa US Patent 6,189,032, 2001 | 100 | 2001 |
| Information distribution method, information distribution system and in-vehicle terminal T Matsumoto, A Shimizu, K Umezawa, T Osafune, K Mitsui, H Endo US Patent 9,515,829, 2016 | 87 | 2016 |
| Attribute Certificate Verification Method and System A Takahashi, H Sakazaki, S Susaki, K Hamaguchi, K Umezawa, ... US Patent App. 11/762,412, 2008 | 68 | 2008 |
| Certificate management system and method K Umezawa, H Uchiyama, S Susaki, T Kodama US Patent 7,386,722, 2008 | 47 | 2008 |
| System and method for authentication H Aoshima, T Kaji, K Umezawa, H Matsushima, H Yoshiura, H Toyoshima US Patent App. 10/231,254, 2003 | 36 | 2003 |
| Distributed object system and service supply method therein S Susaki, K Umezawa, T Kaji, S Tezuka, R Sasaki, K Tabata, T Akaosugi, ... US Patent 6,327,658, 2001 | 25 | 2001 |
| Terminal system for guaranteeing authenticity, terminal, and terminal management server T Kato, K Umezawa, M Kayashima, M Umemura, A Kanehira US Patent 8,413,214, 2013 | 21 | 2013 |
| Ic card, ic card system, and method thereof K Umezawa, K Matsumoto, K Terada, Y Yamaguchi US Patent App. 12/919,595, 2011 | 21 | 2011 |
| Information processor-based service providing system and method H Uchiyama, K Umezawa, S Susaki, K Matsumoto US Patent 7,357,313, 2008 | 19 | 2008 |
| Secure workflow system and method for the same K Umezawa, T Kaji US Patent App. 09/814,822, 2002 | 17 | 2002 |
| A method of threat analysis for cyber-physical system using vulnerability databases Y Mishina, K Takaragi, K Umezawa 2018 IEEE International Symposium on Technologies for Homeland Security (HST …, 2018 | 11 | 2018 |
| Experiment and Evaluation of Effective Grouped Flipped Classroom K Umezawa, M Kobayashi, T Ishida, M Nakazawa, S Hirasawa Proceeding of the 5th International Conference on Applied Computing …, 2017 | 11 | 2017 |
| A method based on self-study log information for improving effectiveness of classroom component in flipped classroom approach K Umezawa, T Ishida, M Aramoto, M Kobayashi, M Nakazawa, ... Blended learning: Concepts, methodologies, tools, and applications, 1818-1834, 2017 | 11 | 2017 |
| An effective flipped classroom based on log information of self-study K Umezawa, M Aramoto, M Kobayashi, T Ishida, M Nakazawa, ... 2015 3rd International Conference on Applied Computing and Information …, 2015 | 11 | 2015 |
| Development and evaluation of certificate verification system in mobile environment K Umezawa Computer Security Symposium, Computer Security Group, Information Processing …, 2005 | 11 | 2005 |
| Evaluation by questionnaire on grouped flipped classroom method K Umezawa, T Ishida, M Nakazawa, S Hirasawa 2018 IEEE 10th International Conference on Engineering Education (ICEED), 83-88, 2018 | 10 | 2018 |
| An Electroencephalograph-based Method for Judging the Difficulty of a Task given to a Learner K Umezawa, T Saito, T Ishida, M Nakazawa, S Hirasawa 2017 IEEE 17th International Conference on Advanced Learning Technologies …, 2017 | 10 | 2017 |
| Competitive compliance with blockchain S Wohlgemuth, K Umezawa, Y Mishina, K Takaragi 2019 IEEE International Conference on Pervasive Computing and Communications …, 2019 | 9 | 2019 |
| A judgment method of difficulty of task for a learner using simple electroencephalograph K Umezawa, T Ishida, T Saito, M Nakazawa, S Hirasawa Information Processing Society of Japan (IPSJ) SIG Technical Report, 1-6, 2016 | 9 | 2016 |
| Development of debugging exercise extraction system using learning history K Umezawa, M Nakazawa, M Goto, S Hirasawa 2019 IEEE Tenth International Conference on Technology for Education (T4E …, 2019 | 8 | 2019 |
